Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

49 files changed, 10430 insertions, 0 deletions

diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
new file mode 100644
index 00000000000..323f72c64cd
--- /dev/null
+++ b/arch/um/drivers/Makefile
@@ -0,0 +1,46 @@
+# 
+# Copyright (C) 2000, 2002, 2003 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+# pcap is broken in 2.5 because kbuild doesn't allow pcap.a to be linked
+# in to pcap.o
+
+slip-objs := slip_kern.o slip_user.o
+slirp-objs := slirp_kern.o slirp_user.o
+daemon-objs := daemon_kern.o daemon_user.o
+mcast-objs := mcast_kern.o mcast_user.o
+#pcap-objs := pcap_kern.o pcap_user.o $(PCAP)
+net-objs := net_kern.o net_user.o
+mconsole-objs := mconsole_kern.o mconsole_user.o
+hostaudio-objs := hostaudio_kern.o
+ubd-objs := ubd_kern.o ubd_user.o
+port-objs := port_kern.o port_user.o
+harddog-objs := harddog_kern.o harddog_user.o
+
+obj-y := stdio_console.o fd.o chan_kern.o chan_user.o line.o
+obj-$(CONFIG_SSL) += ssl.o
+obj-$(CONFIG_STDERR_CONSOLE) += stderr_console.o
+
+obj-$(CONFIG_UML_NET_SLIP) += slip.o
+obj-$(CONFIG_UML_NET_SLIRP) += slirp.o
+obj-$(CONFIG_UML_NET_DAEMON) += daemon.o 
+obj-$(CONFIG_UML_NET_MCAST) += mcast.o 
+#obj-$(CONFIG_UML_NET_PCAP) += pcap.o $(PCAP)
+obj-$(CONFIG_UML_NET) += net.o 
+obj-$(CONFIG_MCONSOLE) += mconsole.o
+obj-$(CONFIG_MMAPPER) += mmapper_kern.o 
+obj-$(CONFIG_BLK_DEV_UBD) += ubd.o 
+obj-$(CONFIG_HOSTAUDIO) += hostaudio.o
+obj-$(CONFIG_NULL_CHAN) += null.o 
+obj-$(CONFIG_PORT_CHAN) += port.o
+obj-$(CONFIG_PTY_CHAN) += pty.o
+obj-$(CONFIG_TTY_CHAN) += tty.o 
+obj-$(CONFIG_XTERM_CHAN) += xterm.o xterm_kern.o
+obj-$(CONFIG_UML_WATCHDOG) += harddog.o
+obj-$(CONFIG_BLK_DEV_COW_COMMON) += cow_user.o
+obj-$(CONFIG_UML_RANDOM) += random.o
+
+USER_OBJS := fd.o null.o pty.o tty.o xterm.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
new file mode 100644
index 00000000000..1f77deb3fd2
--- /dev/null
+++ b/arch/um/drivers/chan_kern.c
@@ -0,0 +1,577 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/string.h>
+#include <linux/tty_flip.h>
+#include <asm/irq.h>
+#include "chan_kern.h"
+#include "user_util.h"
+#include "kern.h"
+#include "irq_user.h"
+#include "sigio.h"
+#include "line.h"
+#include "os.h"
+
+#ifdef CONFIG_NOCONFIG_CHAN
+static void *not_configged_init(char *str, int device, struct chan_opts *opts)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(NULL);
+}
+
+static int not_configged_open(int input, int output, int primary, void *data,
+			      char **dev_out)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(-ENODEV);
+}
+
+static void not_configged_close(int fd, void *data)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+}
+
+static int not_configged_read(int fd, char *c_out, void *data)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(-EIO);
+}
+
+static int not_configged_write(int fd, const char *buf, int len, void *data)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(-EIO);
+}
+
+static int not_configged_console_write(int fd, const char *buf, int len,
+				       void *data)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(-EIO);
+}
+
+static int not_configged_window_size(int fd, void *data, unsigned short *rows,
+				     unsigned short *cols)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+	return(-ENODEV);
+}
+
+static void not_configged_free(void *data)
+{
+	printk(KERN_ERR "Using a channel type which is configured out of "
+	       "UML\n");
+}
+
+static struct chan_ops not_configged_ops = {
+	.init		= not_configged_init,
+	.open		= not_configged_open,
+	.close		= not_configged_close,
+	.read		= not_configged_read,
+	.write		= not_configged_write,
+	.console_write	= not_configged_console_write,
+	.window_size	= not_configged_window_size,
+	.free		= not_configged_free,
+	.winch		= 0,
+};
+#endif /* CONFIG_NOCONFIG_CHAN */
+
+void generic_close(int fd, void *unused)
+{
+	os_close_file(fd);
+}
+
+int generic_read(int fd, char *c_out, void *unused)
+{
+	int n;
+
+	n = os_read_file(fd, c_out, sizeof(*c_out));
+
+	if(n == -EAGAIN)
+		return(0);
+	else if(n == 0)
+		return(-EIO);
+	return(n);
+}
+
+/* XXX Trivial wrapper around os_write_file */
+
+int generic_write(int fd, const char *buf, int n, void *unused)
+{
+	return(os_write_file(fd, buf, n));
+}
+
+int generic_window_size(int fd, void *unused, unsigned short *rows_out,
+			unsigned short *cols_out)
+{
+	int rows, cols;
+	int ret;
+
+	ret = os_window_size(fd, &rows, &cols);
+	if(ret < 0)
+		return(ret);
+
+	ret = ((*rows_out != rows) || (*cols_out != cols));
+
+	*rows_out = rows;
+	*cols_out = cols;
+
+	return(ret);
+}
+
+void generic_free(void *data)
+{
+	kfree(data);
+}
+
+static void tty_receive_char(struct tty_struct *tty, char ch)
+{
+	if(tty == NULL) return;
+
+	if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
+		if(ch == STOP_CHAR(tty)){
+			stop_tty(tty);
+			return;
+		}
+		else if(ch == START_CHAR(tty)){
+			start_tty(tty);
+			return;
+		}
+	}
+
+	if((tty->flip.flag_buf_ptr == NULL) || 
+	   (tty->flip.char_buf_ptr == NULL))
+		return;
+	tty_insert_flip_char(tty, ch, TTY_NORMAL);
+}
+
+static int open_one_chan(struct chan *chan, int input, int output, int primary)
+{
+	int fd;
+
+	if(chan->opened) return(0);
+	if(chan->ops->open == NULL) fd = 0;
+	else fd = (*chan->ops->open)(input, output, primary, chan->data,
+				     &chan->dev);
+	if(fd < 0) return(fd);
+	chan->fd = fd;
+
+	chan->opened = 1;
+	return(0);
+}
+
+int open_chan(struct list_head *chans)
+{
+	struct list_head *ele;
+	struct chan *chan;
+	int ret, err = 0;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		ret = open_one_chan(chan, chan->input, chan->output,
+				    chan->primary);
+		if(chan->primary) err = ret;
+	}
+	return(err);
+}
+
+void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
+{
+	struct list_head *ele;
+	struct chan *chan;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(chan->primary && chan->output && chan->ops->winch){
+			register_winch(chan->fd, tty);
+			return;
+		}
+	}
+}
+
+void enable_chan(struct list_head *chans, struct tty_struct *tty)
+{
+	struct list_head *ele;
+	struct chan *chan;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(!chan->opened) continue;
+
+		line_setup_irq(chan->fd, chan->input, chan->output, tty);
+	}
+}
+
+void close_chan(struct list_head *chans)
+{
+	struct chan *chan;
+
+	/* Close in reverse order as open in case more than one of them
+	 * refers to the same device and they save and restore that device's
+	 * state.  Then, the first one opened will have the original state,
+	 * so it must be the last closed.
+	 */
+	list_for_each_entry_reverse(chan, chans, list) {
+		if(!chan->opened) continue;
+		if(chan->ops->close != NULL)
+			(*chan->ops->close)(chan->fd, chan->data);
+		chan->opened = 0;
+		chan->fd = -1;
+	}
+}
+
+int write_chan(struct list_head *chans, const char *buf, int len, 
+	       int write_irq)
+{
+	struct list_head *ele;
+	struct chan *chan = NULL;
+	int n, ret = 0;
+
+	list_for_each(ele, chans) {
+		chan = list_entry(ele, struct chan, list);
+		if (!chan->output || (chan->ops->write == NULL))
+			continue;
+		n = chan->ops->write(chan->fd, buf, len, chan->data);
+		if (chan->primary) {
+			ret = n;
+			if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
+				reactivate_fd(chan->fd, write_irq);
+		}
+	}
+	return(ret);
+}
+
+int console_write_chan(struct list_head *chans, const char *buf, int len)
+{
+	struct list_head *ele;
+	struct chan *chan;
+	int n, ret = 0;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(!chan->output || (chan->ops->console_write == NULL))
+			continue;
+		n = chan->ops->console_write(chan->fd, buf, len, chan->data);
+		if(chan->primary) ret = n;
+	}
+	return(ret);
+}
+
+int console_open_chan(struct line *line, struct console *co, struct chan_opts *opts)
+{
+	if (!list_empty(&line->chan_list))
+		return 0;
+
+	if (0 != parse_chan_pair(line->init_str, &line->chan_list,
+				 line->init_pri, co->index, opts))
+		return -1;
+	if (0 != open_chan(&line->chan_list))
+		return -1;
+	printk("Console initialized on /dev/%s%d\n",co->name,co->index);
+	return 0;
+}
+
+int chan_window_size(struct list_head *chans, unsigned short *rows_out,
+		      unsigned short *cols_out)
+{
+	struct list_head *ele;
+	struct chan *chan;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(chan->primary){
+			if(chan->ops->window_size == NULL) return(0);
+			return(chan->ops->window_size(chan->fd, chan->data,
+						      rows_out, cols_out));
+		}
+	}
+	return(0);
+}
+
+void free_one_chan(struct chan *chan)
+{
+	list_del(&chan->list);
+	if(chan->ops->free != NULL)
+		(*chan->ops->free)(chan->data);
+	free_irq_by_fd(chan->fd);
+	if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
+	kfree(chan);
+}
+
+void free_chan(struct list_head *chans)
+{
+	struct list_head *ele, *next;
+	struct chan *chan;
+
+	list_for_each_safe(ele, next, chans){
+		chan = list_entry(ele, struct chan, list);
+		free_one_chan(chan);
+	}
+}
+
+static int one_chan_config_string(struct chan *chan, char *str, int size,
+				  char **error_out)
+{
+	int n = 0;
+
+	if(chan == NULL){
+		CONFIG_CHUNK(str, size, n, "none", 1);
+		return(n);
+	}
+
+	CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
+
+	if(chan->dev == NULL){
+		CONFIG_CHUNK(str, size, n, "", 1);
+		return(n);
+	}
+
+	CONFIG_CHUNK(str, size, n, ":", 0);
+	CONFIG_CHUNK(str, size, n, chan->dev, 0);
+
+	return(n);
+}
+
+static int chan_pair_config_string(struct chan *in, struct chan *out, 
+				   char *str, int size, char **error_out)
+{
+	int n;
+
+	n = one_chan_config_string(in, str, size, error_out);
+	str += n;
+	size -= n;
+
+	if(in == out){
+		CONFIG_CHUNK(str, size, n, "", 1);
+		return(n);
+	}
+
+	CONFIG_CHUNK(str, size, n, ",", 1);
+	n = one_chan_config_string(out, str, size, error_out);
+	str += n;
+	size -= n;
+	CONFIG_CHUNK(str, size, n, "", 1);
+
+	return(n);
+}
+
+int chan_config_string(struct list_head *chans, char *str, int size, 
+		       char **error_out)
+{
+	struct list_head *ele;
+	struct chan *chan, *in = NULL, *out = NULL;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(!chan->primary)
+			continue;
+		if(chan->input)
+			in = chan;
+		if(chan->output)
+			out = chan;
+	}
+
+	return(chan_pair_config_string(in, out, str, size, error_out));
+}
+
+struct chan_type {
+	char *key;
+	struct chan_ops *ops;
+};
+
+struct chan_type chan_table[] = {
+	{ "fd", &fd_ops },
+
+#ifdef CONFIG_NULL_CHAN
+	{ "null", &null_ops },
+#else
+	{ "null", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_PORT_CHAN
+	{ "port", &port_ops },
+#else
+	{ "port", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_PTY_CHAN
+	{ "pty", &pty_ops },
+	{ "pts", &pts_ops },
+#else
+	{ "pty", &not_configged_ops },
+	{ "pts", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_TTY_CHAN
+	{ "tty", &tty_ops },
+#else
+	{ "tty", &not_configged_ops },
+#endif
+
+#ifdef CONFIG_XTERM_CHAN
+	{ "xterm", &xterm_ops },
+#else
+	{ "xterm", &not_configged_ops },
+#endif
+};
+
+static struct chan *parse_chan(char *str, int pri, int device, 
+			       struct chan_opts *opts)
+{
+	struct chan_type *entry;
+	struct chan_ops *ops;
+	struct chan *chan;
+	void *data;
+	int i;
+
+	ops = NULL;
+	data = NULL;
+	for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
+		entry = &chan_table[i];
+		if(!strncmp(str, entry->key, strlen(entry->key))){
+			ops = entry->ops;
+			str += strlen(entry->key);
+			break;
+		}
+	}
+	if(ops == NULL){
+		printk(KERN_ERR "parse_chan couldn't parse \"%s\"\n", 
+		       str);
+		return(NULL);
+	}
+	if(ops->init == NULL) return(NULL); 
+	data = (*ops->init)(str, device, opts);
+	if(data == NULL) return(NULL);
+
+	chan = kmalloc(sizeof(*chan), GFP_KERNEL);
+	if(chan == NULL) return(NULL);
+	*chan = ((struct chan) { .list	 	= LIST_HEAD_INIT(chan->list),
+				 .primary	= 1,
+				 .input		= 0,
+				 .output 	= 0,
+				 .opened  	= 0,
+				 .fd 		= -1,
+				 .pri 		= pri,
+				 .ops 		= ops,
+				 .data 		= data });
+	return(chan);
+}
+
+int parse_chan_pair(char *str, struct list_head *chans, int pri, int device,
+		    struct chan_opts *opts)
+{
+	struct chan *new, *chan;
+	char *in, *out;
+
+	if(!list_empty(chans)){
+		chan = list_entry(chans->next, struct chan, list);
+		if(chan->pri >= pri) return(0);
+		free_chan(chans);
+		INIT_LIST_HEAD(chans);
+	}
+
+	out = strchr(str, ',');
+	if(out != NULL){
+		in = str;
+		*out = '\0';
+		out++;
+		new = parse_chan(in, pri, device, opts);
+		if(new == NULL) return(-1);
+		new->input = 1;
+		list_add(&new->list, chans);
+
+		new = parse_chan(out, pri, device, opts);
+		if(new == NULL) return(-1);
+		list_add(&new->list, chans);
+		new->output = 1;
+	}
+	else {
+		new = parse_chan(str, pri, device, opts);
+		if(new == NULL) return(-1);
+		list_add(&new->list, chans);
+		new->input = 1;
+		new->output = 1;
+	}
+	return(0);
+}
+
+int chan_out_fd(struct list_head *chans)
+{
+	struct list_head *ele;
+	struct chan *chan;
+
+	list_for_each(ele, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(chan->primary && chan->output)
+			return(chan->fd);
+	}
+	return(-1);
+}
+
+void chan_interrupt(struct list_head *chans, struct work_struct *task,
+		    struct tty_struct *tty, int irq)
+{
+	struct list_head *ele, *next;
+	struct chan *chan;
+	int err;
+	char c;
+
+	list_for_each_safe(ele, next, chans){
+		chan = list_entry(ele, struct chan, list);
+		if(!chan->input || (chan->ops->read == NULL)) continue;
+		do {
+			if((tty != NULL) && 
+			   (tty->flip.count >= TTY_FLIPBUF_SIZE)){
+				schedule_work(task);
+				goto out;
+			}
+			err = chan->ops->read(chan->fd, &c, chan->data);
+			if(err > 0)
+				tty_receive_char(tty, c);
+		} while(err > 0);
+
+		if(err == 0) reactivate_fd(chan->fd, irq);
+		if(err == -EIO){
+			if(chan->primary){
+				if(tty != NULL)
+					tty_hangup(tty);
+				line_disable(tty, irq);
+				close_chan(chans);
+				free_chan(chans);
+				return;
+			}
+			else {
+				if(chan->ops->close != NULL)
+					chan->ops->close(chan->fd, chan->data);
+				free_one_chan(chan);
+			}
+		}
+	}
+ out:
+	if(tty) tty_flip_buffer_push(tty);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
new file mode 100644
index 00000000000..583b8e137c3
--- /dev/null
+++ b/arch/um/drivers/chan_user.c
@@ -0,0 +1,210 @@
+/* 
+ * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <termios.h>
+#include <string.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include "kern_util.h"
+#include "user_util.h"
+#include "chan_user.h"
+#include "user.h"
+#include "helper.h"
+#include "os.h"
+#include "choose-mode.h"
+#include "mode.h"
+
+int generic_console_write(int fd, const char *buf, int n, void *unused)
+{
+	struct termios save, new;
+	int err;
+
+	if(isatty(fd)){
+		CATCH_EINTR(err = tcgetattr(fd, &save));
+		if (err)
+			goto error;
+		new = save;
+		/* The terminal becomes a bit less raw, to handle \n also as
+		 * "Carriage Return", not only as "New Line". Otherwise, the new
+		 * line won't start at the first column.*/
+		new.c_oflag |= OPOST;
+		CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &new));
+		if (err)
+			goto error;
+	}
+	err = generic_write(fd, buf, n, NULL);
+	/* Restore raw mode, in any case; we *must* ignore any error apart
+	 * EINTR, except for debug.*/
+	if(isatty(fd))
+		CATCH_EINTR(tcsetattr(fd, TCSAFLUSH, &save));
+	return(err);
+error:
+	return(-errno);
+}
+
+/*
+ * UML SIGWINCH handling
+ *
+ * The point of this is to handle SIGWINCH on consoles which have host ttys and
+ * relay them inside UML to whatever might be running on the console and cares
+ * about the window size (since SIGWINCH notifies about terminal size changes).
+ *
+ * So, we have a separate thread for each host tty attached to a UML device
+ * (side-issue - I'm annoyed that one thread can't have multiple controlling
+ * ttys for purposed of handling SIGWINCH, but I imagine there are other reasons
+ * that doesn't make any sense).
+ *
+ * SIGWINCH can't be received synchronously, so you have to set up to receive it
+ * as a signal.  That being the case, if you are going to wait for it, it is
+ * convenient to sit in a pause() and wait for the signal to bounce you out of
+ * it (see below for how we make sure to exit only on SIGWINCH).
+ */
+
+static void winch_handler(int sig)
+{
+}
+
+struct winch_data {
+	int pty_fd;
+	int pipe_fd;
+	int close_me;
+};
+
+static int winch_thread(void *arg)
+{
+	struct winch_data *data = arg;
+	sigset_t sigs;
+	int pty_fd, pipe_fd;
+	int count, err;
+	char c = 1;
+
+	os_close_file(data->close_me);
+	pty_fd = data->pty_fd;
+	pipe_fd = data->pipe_fd;
+	count = os_write_file(pipe_fd, &c, sizeof(c));
+	if(count != sizeof(c))
+		printk("winch_thread : failed to write synchronization "
+		       "byte, err = %d\n", -count);
+
+	/* We are not using SIG_IGN on purpose, so don't fix it as I thought to
+	 * do! If using SIG_IGN, the pause() call below would not stop on
+	 * SIGWINCH. */
+
+	signal(SIGWINCH, winch_handler);
+	sigfillset(&sigs);
+	sigdelset(&sigs, SIGWINCH);
+	/* Block anything else than SIGWINCH. */
+	if(sigprocmask(SIG_SETMASK, &sigs, NULL) < 0){
+		printk("winch_thread : sigprocmask failed, errno = %d\n", 
+		       errno);
+		exit(1);
+	}
+
+	if(setsid() < 0){
+		printk("winch_thread : setsid failed, errno = %d\n", errno);
+		exit(1);
+	}
+
+	err = os_new_tty_pgrp(pty_fd, os_getpid());
+	if(err < 0){
+		printk("winch_thread : new_tty_pgrp failed, err = %d\n", -err);
+		exit(1);
+	}
+
+	/* These are synchronization calls between various UML threads on the
+	 * host - since they are not different kernel threads, we cannot use
+	 * kernel semaphores. We don't use SysV semaphores because they are
+	 * persistant. */
+	count = os_read_file(pipe_fd, &c, sizeof(c));
+	if(count != sizeof(c))
+		printk("winch_thread : failed to read synchronization byte, "
+		       "err = %d\n", -count);
+
+	while(1){
+		/* This will be interrupted by SIGWINCH only, since other signals
+		 * are blocked.*/
+		pause();
+
+		count = os_write_file(pipe_fd, &c, sizeof(c));
+		if(count != sizeof(c))
+			printk("winch_thread : write failed, err = %d\n",
+			       -count);
+	}
+}
+
+static int winch_tramp(int fd, struct tty_struct *tty, int *fd_out)
+{
+	struct winch_data data;
+	unsigned long stack;
+	int fds[2], pid, n, err;
+	char c;
+
+	err = os_pipe(fds, 1, 1);
+	if(err < 0){
+		printk("winch_tramp : os_pipe failed, err = %d\n", -err);
+		return(err);
+	}
+
+	data = ((struct winch_data) { .pty_fd 		= fd,
+				      .pipe_fd 		= fds[1],
+				      .close_me 	= fds[0] } );
+	pid = run_helper_thread(winch_thread, &data, 0, &stack, 0);
+	if(pid < 0){
+		printk("fork of winch_thread failed - errno = %d\n", errno);
+		return(pid);
+	}
+
+	os_close_file(fds[1]);
+	*fd_out = fds[0];
+	n = os_read_file(fds[0], &c, sizeof(c));
+	if(n != sizeof(c)){
+		printk("winch_tramp : failed to read synchronization byte\n");
+		printk("read failed, err = %d\n", -n);
+		printk("fd %d will not support SIGWINCH\n", fd);
+		*fd_out = -1;
+	}
+	return(pid);
+}
+
+void register_winch(int fd, struct tty_struct *tty)
+{
+	int pid, thread, thread_fd;
+	int count;
+	char c = 1;
+
+	if(!isatty(fd))
+		return;
+
+	pid = tcgetpgrp(fd);
+	if(!CHOOSE_MODE_PROC(is_tracer_winch, is_skas_winch, pid, fd,
+			     tty) && (pid == -1)){
+		thread = winch_tramp(fd, tty, &thread_fd);
+		if(fd != -1){
+			register_winch_irq(thread_fd, fd, thread, tty);
+
+			count = os_write_file(thread_fd, &c, sizeof(c));
+			if(count != sizeof(c))
+				printk("register_winch : failed to write "
+				       "synchronization byte, err = %d\n",
+					-count);
+		}
+	}
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/cow.h b/arch/um/drivers/cow.h
new file mode 100644
index 00000000000..4fcbe8b1b77
--- /dev/null
+++ b/arch/um/drivers/cow.h
@@ -0,0 +1,42 @@
+#ifndef __COW_H__
+#define __COW_H__
+
+#include <asm/types.h>
+
+#if __BYTE_ORDER == __BIG_ENDIAN
+# define ntohll(x) (x)
+# define htonll(x) (x)
+#elif __BYTE_ORDER == __LITTLE_ENDIAN
+# define ntohll(x)  bswap_64(x)
+# define htonll(x)  bswap_64(x)
+#else
+#error "__BYTE_ORDER not defined"
+#endif
+
+extern int init_cow_file(int fd, char *cow_file, char *backing_file,
+			 int sectorsize, int alignment, int *bitmap_offset_out,
+			 unsigned long *bitmap_len_out, int *data_offset_out);
+
+extern int file_reader(__u64 offset, char *buf, int len, void *arg);
+extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
+			   void *arg, __u32 *version_out,
+			   char **backing_file_out, time_t *mtime_out,
+			   unsigned long long *size_out, int *sectorsize_out,
+			   __u32 *align_out, int *bitmap_offset_out);
+
+extern int write_cow_header(char *cow_file, int fd, char *backing_file,
+			    int sectorsize, int alignment,
+			    unsigned long long *size);
+
+extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
+		      int bitmap_offset, unsigned long *bitmap_len_out,
+		      int *data_offset_out);
+
+#endif
+
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/cow_sys.h b/arch/um/drivers/cow_sys.h
new file mode 100644
index 00000000000..c83fc5d6893
--- /dev/null
+++ b/arch/um/drivers/cow_sys.h
@@ -0,0 +1,48 @@
+#ifndef __COW_SYS_H__
+#define __COW_SYS_H__
+
+#include "kern_util.h"
+#include "user_util.h"
+#include "os.h"
+#include "user.h"
+
+static inline void *cow_malloc(int size)
+{
+	return(um_kmalloc(size));
+}
+
+static inline void cow_free(void *ptr)
+{
+	kfree(ptr);
+}
+
+#define cow_printf printk
+
+static inline char *cow_strdup(char *str)
+{
+	return(uml_strdup(str));
+}
+
+static inline int cow_seek_file(int fd, unsigned long long offset)
+{
+	return(os_seek_file(fd, offset));
+}
+
+static inline int cow_file_size(char *file, unsigned long long *size_out)
+{
+	return(os_file_size(file, size_out));
+}
+
+static inline int cow_write_file(int fd, char *buf, int size)
+{
+	return(os_write_file(fd, buf, size));
+}
+
+#endif
+
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/cow_user.c b/arch/um/drivers/cow_user.c
new file mode 100644
index 00000000000..a8ce6fc3ef2
--- /dev/null
+++ b/arch/um/drivers/cow_user.c
@@ -0,0 +1,378 @@
+#include <stddef.h>
+#include <string.h>
+#include <errno.h>
+/* _XOPEN_SOURCE is needed for pread, but we define _GNU_SOURCE, which defines
+ * that.
+ */
+#include <unistd.h>
+#include <byteswap.h>
+#include <sys/time.h>
+#include <sys/param.h>
+#include <sys/user.h>
+#include <netinet/in.h>
+
+#include "os.h"
+
+#include "cow.h"
+#include "cow_sys.h"
+
+#define PATH_LEN_V1 256
+
+struct cow_header_v1 {
+	int magic;
+	int version;
+	char backing_file[PATH_LEN_V1];
+	time_t mtime;
+	__u64 size;
+	int sectorsize;
+};
+
+#define PATH_LEN_V2 MAXPATHLEN
+
+struct cow_header_v2 {
+	__u32 magic;
+	__u32 version;
+	char backing_file[PATH_LEN_V2];
+	time_t mtime;
+	__u64 size;
+	int sectorsize;
+};
+
+/* Define PATH_LEN_V3 as the usual value of MAXPATHLEN, just hard-code it in
+ * case other systems have different values for MAXPATHLEN
+ */
+#define PATH_LEN_V3 4096
+
+/* Changes from V2 -
+ *	PATH_LEN_V3 as described above
+ *	Explicitly specify field bit lengths for systems with different
+ *		lengths for the usual C types.  Not sure whether char or
+ *		time_t should be changed, this can be changed later without
+ *		breaking compatibility
+ *	Add alignment field so that different alignments can be used for the
+ *		bitmap and data
+ * 	Add cow_format field to allow for the possibility of different ways
+ *		of specifying the COW blocks.  For now, the only value is 0,
+ * 		for the traditional COW bitmap.
+ *	Move the backing_file field to the end of the header.  This allows
+ *		for the possibility of expanding it into the padding required
+ *		by the bitmap alignment.
+ * 	The bitmap and data portions of the file will be aligned as specified
+ * 		by the alignment field.  This is to allow COW files to be
+ *		put on devices with restrictions on access alignments, such as
+ *		/dev/raw, with a 512 byte alignment restriction.  This also
+ *		allows the data to be more aligned more strictly than on
+ *		sector boundaries.  This is needed for ubd-mmap, which needs
+ *		the data to be page aligned.
+ *	Fixed (finally!) the rounding bug
+ */
+
+struct cow_header_v3 {
+	__u32 magic;
+	__u32 version;
+	__u32 mtime;
+	__u64 size;
+	__u32 sectorsize;
+	__u32 alignment;
+	__u32 cow_format;
+	char backing_file[PATH_LEN_V3];
+};
+
+/* COW format definitions - for now, we have only the usual COW bitmap */
+#define COW_BITMAP 0
+
+union cow_header {
+	struct cow_header_v1 v1;
+	struct cow_header_v2 v2;
+	struct cow_header_v3 v3;
+};
+
+#define COW_MAGIC 0x4f4f4f4d  /* MOOO */
+#define COW_VERSION 3
+
+#define DIV_ROUND(x, len) (((x) + (len) - 1) / (len))
+#define ROUND_UP(x, align) DIV_ROUND(x, align) * (align)
+
+void cow_sizes(int version, __u64 size, int sectorsize, int align,
+	       int bitmap_offset, unsigned long *bitmap_len_out,
+	       int *data_offset_out)
+{
+	if(version < 3){
+		*bitmap_len_out = (size + sectorsize - 1) / (8 * sectorsize);
+
+		*data_offset_out = bitmap_offset + *bitmap_len_out;
+		*data_offset_out = (*data_offset_out + sectorsize - 1) /
+			sectorsize;
+		*data_offset_out *= sectorsize;
+	}
+	else {
+		*bitmap_len_out = DIV_ROUND(size, sectorsize);
+		*bitmap_len_out = DIV_ROUND(*bitmap_len_out, 8);
+
+		*data_offset_out = bitmap_offset + *bitmap_len_out;
+		*data_offset_out = ROUND_UP(*data_offset_out, align);
+	}
+}
+
+static int absolutize(char *to, int size, char *from)
+{
+	char save_cwd[256], *slash;
+	int remaining;
+
+	if(getcwd(save_cwd, sizeof(save_cwd)) == NULL) {
+		cow_printf("absolutize : unable to get cwd - errno = %d\n",
+			   errno);
+		return(-1);
+	}
+	slash = strrchr(from, '/');
+	if(slash != NULL){
+		*slash = '\0';
+		if(chdir(from)){
+			*slash = '/';
+			cow_printf("absolutize : Can't cd to '%s' - "
+				   "errno = %d\n", from, errno);
+			return(-1);
+		}
+		*slash = '/';
+		if(getcwd(to, size) == NULL){
+			cow_printf("absolutize : unable to get cwd of '%s' - "
+			       "errno = %d\n", from, errno);
+			return(-1);
+		}
+		remaining = size - strlen(to);
+		if(strlen(slash) + 1 > remaining){
+			cow_printf("absolutize : unable to fit '%s' into %d "
+			       "chars\n", from, size);
+			return(-1);
+		}
+		strcat(to, slash);
+	}
+	else {
+		if(strlen(save_cwd) + 1 + strlen(from) + 1 > size){
+			cow_printf("absolutize : unable to fit '%s' into %d "
+			       "chars\n", from, size);
+			return(-1);
+		}
+		strcpy(to, save_cwd);
+		strcat(to, "/");
+		strcat(to, from);
+	}
+	chdir(save_cwd);
+	return(0);
+}
+
+int write_cow_header(char *cow_file, int fd, char *backing_file,
+		     int sectorsize, int alignment, unsigned long long *size)
+{
+	struct cow_header_v3 *header;
+	unsigned long modtime;
+	int err;
+
+	err = cow_seek_file(fd, 0);
+	if(err < 0){
+		cow_printf("write_cow_header - lseek failed, err = %d\n", -err);
+		goto out;
+	}
+
+	err = -ENOMEM;
+	header = cow_malloc(sizeof(*header));
+	if(header == NULL){
+		cow_printf("Failed to allocate COW V3 header\n");
+		goto out;
+	}
+	header->magic = htonl(COW_MAGIC);
+	header->version = htonl(COW_VERSION);
+
+	err = -EINVAL;
+	if(strlen(backing_file) > sizeof(header->backing_file) - 1){
+		cow_printf("Backing file name \"%s\" is too long - names are "
+			   "limited to %d characters\n", backing_file,
+			   sizeof(header->backing_file) - 1);
+		goto out_free;
+	}
+
+	if(absolutize(header->backing_file, sizeof(header->backing_file),
+		      backing_file))
+		goto out_free;
+
+	err = os_file_modtime(header->backing_file, &modtime);
+	if(err < 0){
+		cow_printf("Backing file '%s' mtime request failed, "
+			   "err = %d\n", header->backing_file, -err);
+		goto out_free;
+	}
+
+	err = cow_file_size(header->backing_file, size);
+	if(err < 0){
+		cow_printf("Couldn't get size of backing file '%s', "
+			   "err = %d\n", header->backing_file, -err);
+		goto out_free;
+	}
+
+	header->mtime = htonl(modtime);
+	header->size = htonll(*size);
+	header->sectorsize = htonl(sectorsize);
+	header->alignment = htonl(alignment);
+	header->cow_format = COW_BITMAP;
+
+	err = os_write_file(fd, header, sizeof(*header));
+	if(err != sizeof(*header)){
+		cow_printf("Write of header to new COW file '%s' failed, "
+			   "err = %d\n", cow_file, -err);
+		goto out_free;
+	}
+	err = 0;
+ out_free:
+	cow_free(header);
+ out:
+	return(err);
+}
+
+int file_reader(__u64 offset, char *buf, int len, void *arg)
+{
+	int fd = *((int *) arg);
+
+	return(pread(fd, buf, len, offset));
+}
+
+/* XXX Need to sanity-check the values read from the header */
+
+int read_cow_header(int (*reader)(__u64, char *, int, void *), void *arg,
+		    __u32 *version_out, char **backing_file_out,
+		    time_t *mtime_out, unsigned long long *size_out,
+		    int *sectorsize_out, __u32 *align_out,
+		    int *bitmap_offset_out)
+{
+	union cow_header *header;
+	char *file;
+	int err, n;
+	unsigned long version, magic;
+
+	header = cow_malloc(sizeof(*header));
+	if(header == NULL){
+	        cow_printf("read_cow_header - Failed to allocate header\n");
+		return(-ENOMEM);
+	}
+	err = -EINVAL;
+	n = (*reader)(0, (char *) header, sizeof(*header), arg);
+	if(n < offsetof(typeof(header->v1), backing_file)){
+		cow_printf("read_cow_header - short header\n");
+		goto out;
+	}
+
+	magic = header->v1.magic;
+	if(magic == COW_MAGIC) {
+		version = header->v1.version;
+	}
+	else if(magic == ntohl(COW_MAGIC)){
+		version = ntohl(header->v1.version);
+	}
+	/* No error printed because the non-COW case comes through here */
+	else goto out;
+
+	*version_out = version;
+
+	if(version == 1){
+		if(n < sizeof(header->v1)){
+			cow_printf("read_cow_header - failed to read V1 "
+				   "header\n");
+			goto out;
+		}
+		*mtime_out = header->v1.mtime;
+		*size_out = header->v1.size;
+		*sectorsize_out = header->v1.sectorsize;
+		*bitmap_offset_out = sizeof(header->v1);
+		*align_out = *sectorsize_out;
+		file = header->v1.backing_file;
+	}
+	else if(version == 2){
+		if(n < sizeof(header->v2)){
+			cow_printf("read_cow_header - failed to read V2 "
+				   "header\n");
+			goto out;
+		}
+		*mtime_out = ntohl(header->v2.mtime);
+		*size_out = ntohll(header->v2.size);
+		*sectorsize_out = ntohl(header->v2.sectorsize);
+		*bitmap_offset_out = sizeof(header->v2);
+		*align_out = *sectorsize_out;
+		file = header->v2.backing_file;
+	}
+	else if(version == 3){
+		if(n < sizeof(header->v3)){
+			cow_printf("read_cow_header - failed to read V2 "
+				   "header\n");
+			goto out;
+		}
+		*mtime_out = ntohl(header->v3.mtime);
+		*size_out = ntohll(header->v3.size);
+		*sectorsize_out = ntohl(header->v3.sectorsize);
+		*align_out = ntohl(header->v3.alignment);
+		*bitmap_offset_out = ROUND_UP(sizeof(header->v3), *align_out);
+		file = header->v3.backing_file;
+	}
+	else {
+		cow_printf("read_cow_header - invalid COW version\n");
+		goto out;
+	}
+	err = -ENOMEM;
+	*backing_file_out = cow_strdup(file);
+	if(*backing_file_out == NULL){
+		cow_printf("read_cow_header - failed to allocate backing "
+			   "file\n");
+		goto out;
+	}
+	err = 0;
+ out:
+	cow_free(header);
+	return(err);
+}
+
+int init_cow_file(int fd, char *cow_file, char *backing_file, int sectorsize,
+		  int alignment, int *bitmap_offset_out,
+		  unsigned long *bitmap_len_out, int *data_offset_out)
+{
+	unsigned long long size, offset;
+	char zero = 0;
+	int err;
+
+	err = write_cow_header(cow_file, fd, backing_file, sectorsize,
+			       alignment, &size);
+	if(err)
+		goto out;
+
+	*bitmap_offset_out = ROUND_UP(sizeof(struct cow_header_v3), alignment);
+	cow_sizes(COW_VERSION, size, sectorsize, alignment, *bitmap_offset_out,
+		  bitmap_len_out, data_offset_out);
+
+	offset = *data_offset_out + size - sizeof(zero);
+	err = cow_seek_file(fd, offset);
+	if(err < 0){
+		cow_printf("cow bitmap lseek failed : err = %d\n", -err);
+		goto out;
+	}
+
+	/* does not really matter how much we write it is just to set EOF
+	 * this also sets the entire COW bitmap
+	 * to zero without having to allocate it
+	 */
+	err = cow_write_file(fd, &zero, sizeof(zero));
+	if(err != sizeof(zero)){
+		cow_printf("Write of bitmap to new COW file '%s' failed, "
+			   "err = %d\n", cow_file, -err);
+		err = -EINVAL;
+		goto out;
+	}
+
+	return(0);
+
+ out:
+	return(err);
+}
+
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/daemon.h b/arch/um/drivers/daemon.h
new file mode 100644
index 00000000000..7326c42f7ef
--- /dev/null
+++ b/arch/um/drivers/daemon.h
@@ -0,0 +1,35 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "net_user.h"
+
+#define SWITCH_VERSION 3
+
+struct daemon_data {
+	char *sock_type;
+	char *ctl_sock;
+	void *ctl_addr;
+	void *data_addr;
+	void *local_addr;
+	int fd;
+	int control;
+	void *dev;
+};
+
+extern struct net_user_info daemon_user_info;
+
+extern int daemon_user_write(int fd, void *buf, int len, 
+			     struct daemon_data *pri);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/daemon_kern.c b/arch/um/drivers/daemon_kern.c
new file mode 100644
index 00000000000..30d285b266a
--- /dev/null
+++ b/arch/um/drivers/daemon_kern.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include "linux/kernel.h"
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "daemon.h"
+
+struct daemon_init {
+	char *sock_type;
+	char *ctl_sock;
+};
+
+void daemon_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct daemon_data *dpri;
+	struct daemon_init *init = data;
+
+	pri = dev->priv;
+	dpri = (struct daemon_data *) pri->user;
+	dpri->sock_type = init->sock_type;
+	dpri->ctl_sock = init->ctl_sock;
+	dpri->fd = -1;
+	dpri->control = -1;
+	dpri->dev = dev;
+
+	printk("daemon backend (uml_switch version %d) - %s:%s", 
+	       SWITCH_VERSION, dpri->sock_type, dpri->ctl_sock);
+	printk("\n");
+}
+
+static int daemon_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
+	if(*skb == NULL) return(-ENOMEM);
+	return(net_recvfrom(fd, (*skb)->mac.raw, 
+			    (*skb)->dev->mtu + ETH_HEADER_OTHER));
+}
+
+static int daemon_write(int fd, struct sk_buff **skb,
+			struct uml_net_private *lp)
+{
+	return(daemon_user_write(fd, (*skb)->data, (*skb)->len, 
+				 (struct daemon_data *) &lp->user));
+}
+
+static struct net_kern_info daemon_kern_info = {
+	.init			= daemon_init,
+	.protocol		= eth_protocol,
+	.read			= daemon_read,
+	.write			= daemon_write,
+};
+
+int daemon_setup(char *str, char **mac_out, void *data)
+{
+	struct daemon_init *init = data;
+	char *remain;
+
+	*init = ((struct daemon_init)
+		{ .sock_type 		= "unix",
+		  .ctl_sock 		= "/tmp/uml.ctl" });
+	
+	remain = split_if_spec(str, mac_out, &init->sock_type, &init->ctl_sock,
+			       NULL);
+	if(remain != NULL)
+		printk(KERN_WARNING "daemon_setup : Ignoring data socket "
+		       "specification\n");
+	
+	return(1);
+}
+
+static struct transport daemon_transport = {
+	.list 		= LIST_HEAD_INIT(daemon_transport.list),
+	.name 		= "daemon",
+	.setup  	= daemon_setup,
+	.user 		= &daemon_user_info,
+	.kern 		= &daemon_kern_info,
+	.private_size 	= sizeof(struct daemon_data),
+	.setup_size 	= sizeof(struct daemon_init),
+};
+
+static int register_daemon(void)
+{
+	register_transport(&daemon_transport);
+	return(1);
+}
+
+__initcall(register_daemon);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/daemon_user.c b/arch/um/drivers/daemon_user.c
new file mode 100644
index 00000000000..cf15b4a8b51
--- /dev/null
+++ b/arch/um/drivers/daemon_user.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/time.h>
+#include "net_user.h"
+#include "daemon.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "user.h"
+#include "os.h"
+
+#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
+
+enum request_type { REQ_NEW_CONTROL };
+
+#define SWITCH_MAGIC 0xfeedface
+
+struct request_v3 {
+	uint32_t magic;
+	uint32_t version;
+	enum request_type type;
+	struct sockaddr_un sock;
+};
+
+static struct sockaddr_un *new_addr(void *name, int len)
+{
+	struct sockaddr_un *sun;
+
+	sun = um_kmalloc(sizeof(struct sockaddr_un));
+	if(sun == NULL){
+		printk("new_addr: allocation of sockaddr_un failed\n");
+		return(NULL);
+	}
+	sun->sun_family = AF_UNIX;
+	memcpy(sun->sun_path, name, len);
+	return(sun);
+}
+
+static int connect_to_switch(struct daemon_data *pri)
+{
+	struct sockaddr_un *ctl_addr = pri->ctl_addr;
+	struct sockaddr_un *local_addr = pri->local_addr;
+	struct sockaddr_un *sun;
+	struct request_v3 req;
+	int fd, n, err;
+
+	pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
+	if(pri->control < 0){
+		printk("daemon_open : control socket failed, errno = %d\n", 
+		       errno);		
+		return(-errno);
+	}
+
+	if(connect(pri->control, (struct sockaddr *) ctl_addr, 
+		   sizeof(*ctl_addr)) < 0){
+		printk("daemon_open : control connect failed, errno = %d\n",
+		       errno);
+		err = -errno;
+		goto out;
+	}
+
+	fd = socket(AF_UNIX, SOCK_DGRAM, 0);
+	if(fd < 0){
+		printk("daemon_open : data socket failed, errno = %d\n", 
+		       errno);
+		err = -errno;
+		goto out;
+	}
+	if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
+		printk("daemon_open : data bind failed, errno = %d\n", 
+		       errno);
+		err = -errno;
+		goto out_close;
+	}
+
+	sun = um_kmalloc(sizeof(struct sockaddr_un));
+	if(sun == NULL){
+		printk("new_addr: allocation of sockaddr_un failed\n");
+		err = -ENOMEM;
+		goto out_close;
+	}
+
+	req.magic = SWITCH_MAGIC;
+	req.version = SWITCH_VERSION;
+	req.type = REQ_NEW_CONTROL;
+	req.sock = *local_addr;
+	n = os_write_file(pri->control, &req, sizeof(req));
+	if(n != sizeof(req)){
+		printk("daemon_open : control setup request failed, err = %d\n",
+		       -n);
+		err = -ENOTCONN;
+		goto out;		
+	}
+
+	n = os_read_file(pri->control, sun, sizeof(*sun));
+	if(n != sizeof(*sun)){
+		printk("daemon_open : read of data socket failed, err = %d\n",
+		       -n);
+		err = -ENOTCONN;
+		goto out_close;		
+	}
+
+	pri->data_addr = sun;
+	return(fd);
+
+ out_close:
+	os_close_file(fd);
+ out:
+	os_close_file(pri->control);
+	return(err);
+}
+
+static void daemon_user_init(void *data, void *dev)
+{
+	struct daemon_data *pri = data;
+	struct timeval tv;
+	struct {
+		char zero;
+		int pid;
+		int usecs;
+	} name;
+
+	if(!strcmp(pri->sock_type, "unix"))
+		pri->ctl_addr = new_addr(pri->ctl_sock, 
+					 strlen(pri->ctl_sock) + 1);
+	name.zero = 0;
+	name.pid = os_getpid();
+	gettimeofday(&tv, NULL);
+	name.usecs = tv.tv_usec;
+	pri->local_addr = new_addr(&name, sizeof(name));
+	pri->dev = dev;
+	pri->fd = connect_to_switch(pri);
+	if(pri->fd < 0){
+		kfree(pri->local_addr);
+		pri->local_addr = NULL;
+	}
+}
+
+static int daemon_open(void *data)
+{
+	struct daemon_data *pri = data;
+	return(pri->fd);
+}
+
+static void daemon_remove(void *data)
+{
+	struct daemon_data *pri = data;
+
+	os_close_file(pri->fd);
+	os_close_file(pri->control);
+	if(pri->data_addr != NULL) kfree(pri->data_addr);
+	if(pri->ctl_addr != NULL) kfree(pri->ctl_addr);
+	if(pri->local_addr != NULL) kfree(pri->local_addr);
+}
+
+int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
+{
+	struct sockaddr_un *data_addr = pri->data_addr;
+
+	return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
+}
+
+static int daemon_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info daemon_user_info = {
+	.init		= daemon_user_init,
+	.open		= daemon_open,
+	.close	 	= NULL,
+	.remove	 	= daemon_remove,
+	.set_mtu	= daemon_set_mtu,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= MAX_PACKET - ETH_HEADER_OTHER
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/fd.c b/arch/um/drivers/fd.c
new file mode 100644
index 00000000000..f0b888f66e0
--- /dev/null
+++ b/arch/um/drivers/fd.c
@@ -0,0 +1,108 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <termios.h>
+#include <errno.h>
+#include "user.h"
+#include "user_util.h"
+#include "chan_user.h"
+
+struct fd_chan {
+	int fd;
+	int raw;
+	struct termios tt;
+	char str[sizeof("1234567890\0")];
+};
+
+static void *fd_init(char *str, int device, struct chan_opts *opts)
+{
+	struct fd_chan *data;
+	char *end;
+	int n;
+
+	if(*str != ':'){
+		printk("fd_init : channel type 'fd' must specify a file "
+		       "descriptor\n");
+		return(NULL);
+	}
+	str++;
+	n = strtoul(str, &end, 0);
+	if((*end != '\0') || (end == str)){
+		printk("fd_init : couldn't parse file descriptor '%s'\n", str);
+		return(NULL);
+	}
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL) return(NULL);
+	*data = ((struct fd_chan) { .fd  	= n,
+				    .raw  	= opts->raw });
+	return(data);
+}
+
+static int fd_open(int input, int output, int primary, void *d, char **dev_out)
+{
+	struct fd_chan *data = d;
+	int err;
+
+	if(data->raw && isatty(data->fd)){
+		CATCH_EINTR(err = tcgetattr(data->fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(data->fd);
+		if(err)
+			return(err);
+	}
+	sprintf(data->str, "%d", data->fd);
+	*dev_out = data->str;
+	return(data->fd);
+}
+
+static void fd_close(int fd, void *d)
+{
+	struct fd_chan *data = d;
+	int err;
+
+	if(data->raw && isatty(fd)){
+		CATCH_EINTR(err = tcsetattr(fd, TCSAFLUSH, &data->tt));
+		if(err)
+			printk("Failed to restore terminal state - "
+			       "errno = %d\n", -err);
+		data->raw = 0;
+	}
+}
+
+static int fd_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct fd_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops fd_ops = {
+	.type		= "fd",
+	.init		= fd_init,
+	.open		= fd_open,
+	.close		= fd_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= fd_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 1,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/harddog_kern.c b/arch/um/drivers/harddog_kern.c
new file mode 100644
index 00000000000..147ec19f6bb
--- /dev/null
+++ b/arch/um/drivers/harddog_kern.c
@@ -0,0 +1,190 @@
+/* UML hardware watchdog, shamelessly stolen from:
+ *
+ *	SoftDog	0.05:	A Software Watchdog Device
+ *
+ *	(c) Copyright 1996 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *				http://www.redhat.com
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	as published by the Free Software Foundation; either version
+ *	2 of the License, or (at your option) any later version.
+ *	
+ *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide 
+ *	warranty for any of this software. This material is provided 
+ *	"AS-IS" and at no charge.	
+ *
+ *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ *	Software only watchdog driver. Unlike its big brother the WDT501P
+ *	driver this won't always recover a failed machine.
+ *
+ *  03/96: Angelo Haritsis <ah@doc.ic.ac.uk> :
+ *	Modularised.
+ *	Added soft_margin; use upon insmod to change the timer delay.
+ *	NB: uses same minor as wdt (WATCHDOG_MINOR); we could use separate
+ *	    minors.
+ *
+ *  19980911 Alan Cox
+ *	Made SMP safe for 2.3.x
+ *
+ *  20011127 Joel Becker (jlbec@evilplan.org>
+ *	Added soft_noboot; Allows testing the softdog trigger without 
+ *	requiring a recompile.
+ *	Added WDIOC_GETTIMEOUT and WDIOC_SETTIMOUT.
+ */
+ 
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include "helper.h"
+#include "mconsole.h"
+
+MODULE_LICENSE("GPL");
+
+/* Locked by the BKL in harddog_open and harddog_release */
+static int timer_alive;
+static int harddog_in_fd = -1;
+static int harddog_out_fd = -1;
+
+/*
+ *	Allow only one person to hold it open
+ */
+ 
+extern int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock);
+
+static int harddog_open(struct inode *inode, struct file *file)
+{
+	int err;
+	char *sock = NULL;
+
+	lock_kernel();
+	if(timer_alive)
+		return -EBUSY;
+#ifdef CONFIG_HARDDOG_NOWAYOUT	 
+	__module_get(THIS_MODULE);
+#endif
+
+#ifdef CONFIG_MCONSOLE
+	sock = mconsole_notify_socket();
+#endif
+	err = start_watchdog(&harddog_in_fd, &harddog_out_fd, sock);
+	if(err) return(err);
+
+	timer_alive = 1;
+	unlock_kernel();
+	return nonseekable_open(inode, file);
+}
+
+extern void stop_watchdog(int in_fd, int out_fd);
+
+static int harddog_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *	Shut off the timer.
+	 */
+	lock_kernel();
+
+	stop_watchdog(harddog_in_fd, harddog_out_fd);
+	harddog_in_fd = -1;
+	harddog_out_fd = -1;
+
+	timer_alive=0;
+	unlock_kernel();
+	return 0;
+}
+
+extern int ping_watchdog(int fd);
+
+static ssize_t harddog_write(struct file *file, const char *data, size_t len,
+			     loff_t *ppos)
+{
+	/*
+	 *	Refresh the timer.
+	 */
+	if(len)
+		return(ping_watchdog(harddog_out_fd));
+	return 0;
+}
+
+static int harddog_ioctl(struct inode *inode, struct file *file,
+			 unsigned int cmd, unsigned long arg)
+{
+	static struct watchdog_info ident = {
+		WDIOC_SETTIMEOUT,
+		0,
+		"UML Hardware Watchdog"
+	};
+	switch (cmd) {
+		default:
+			return -ENOTTY;
+		case WDIOC_GETSUPPORT:
+			if(copy_to_user((struct harddog_info *)arg, &ident,
+					sizeof(ident)))
+				return -EFAULT;
+			return 0;
+		case WDIOC_GETSTATUS:
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0,(int *)arg);
+		case WDIOC_KEEPALIVE:
+			return(ping_watchdog(harddog_out_fd));
+	}
+}
+
+static struct file_operations harddog_fops = {
+	.owner		= THIS_MODULE,
+	.write		= harddog_write,
+	.ioctl		= harddog_ioctl,
+	.open		= harddog_open,
+	.release	= harddog_release,
+};
+
+static struct miscdevice harddog_miscdev = {
+	.minor		= WATCHDOG_MINOR,
+	.name		= "watchdog",
+	.fops		= &harddog_fops,
+};
+
+static char banner[] __initdata = KERN_INFO "UML Watchdog Timer\n";
+
+static int __init harddog_init(void)
+{
+	int ret;
+
+	ret = misc_register(&harddog_miscdev);
+
+	if (ret)
+		return ret;
+
+	printk(banner);
+
+	return(0);
+}
+
+static void __exit harddog_exit(void)
+{
+	misc_deregister(&harddog_miscdev);
+}
+
+module_init(harddog_init);
+module_exit(harddog_exit);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/harddog_user.c b/arch/um/drivers/harddog_user.c
new file mode 100644
index 00000000000..d934181b8d4
--- /dev/null
+++ b/arch/um/drivers/harddog_user.c
@@ -0,0 +1,143 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include "user_util.h"
+#include "user.h"
+#include "helper.h"
+#include "mconsole.h"
+#include "os.h"
+#include "choose-mode.h"
+#include "mode.h"
+
+struct dog_data {
+	int stdin;
+	int stdout;
+	int close_me[2];
+};
+
+static void pre_exec(void *d)
+{
+	struct dog_data *data = d;
+
+	dup2(data->stdin, 0);
+	dup2(data->stdout, 1);
+	dup2(data->stdout, 2);
+	os_close_file(data->stdin);
+	os_close_file(data->stdout);
+	os_close_file(data->close_me[0]);
+	os_close_file(data->close_me[1]);
+}
+
+int start_watchdog(int *in_fd_ret, int *out_fd_ret, char *sock)
+{
+	struct dog_data data;
+	int in_fds[2], out_fds[2], pid, n, err;
+	char pid_buf[sizeof("nnnnn\0")], c;
+	char *pid_args[] = { "/usr/bin/uml_watchdog", "-pid", pid_buf, NULL };
+	char *mconsole_args[] = { "/usr/bin/uml_watchdog", "-mconsole", NULL, 
+				  NULL };
+	char **args = NULL;
+
+	err = os_pipe(in_fds, 1, 0);
+	if(err < 0){
+		printk("harddog_open - os_pipe failed, err = %d\n", -err);
+		goto out;
+	}
+
+	err = os_pipe(out_fds, 1, 0);
+	if(err < 0){
+		printk("harddog_open - os_pipe failed, err = %d\n", -err);
+		goto out_close_in;
+	}
+
+	data.stdin = out_fds[0];
+	data.stdout = in_fds[1];
+	data.close_me[0] = out_fds[1];
+	data.close_me[1] = in_fds[0];
+
+	if(sock != NULL){
+		mconsole_args[2] = sock;
+		args = mconsole_args;
+	}
+	else {
+		/* XXX The os_getpid() is not SMP correct */
+		sprintf(pid_buf, "%d", CHOOSE_MODE(tracing_pid, os_getpid()));
+		args = pid_args;
+	}
+
+	pid = run_helper(pre_exec, &data, args, NULL);
+
+	os_close_file(out_fds[0]);
+	os_close_file(in_fds[1]);
+
+	if(pid < 0){
+		err = -pid;
+		printk("harddog_open - run_helper failed, errno = %d\n", -err);
+		goto out_close_out;
+	}
+
+	n = os_read_file(in_fds[0], &c, sizeof(c));
+	if(n == 0){
+		printk("harddog_open - EOF on watchdog pipe\n");
+		helper_wait(pid);
+		err = -EIO;
+		goto out_close_out;
+	}
+	else if(n < 0){
+		printk("harddog_open - read of watchdog pipe failed, "
+		       "err = %d\n", -n);
+		helper_wait(pid);
+		err = n;
+		goto out_close_out;
+	}
+	*in_fd_ret = in_fds[0];
+	*out_fd_ret = out_fds[1];
+	return(0);
+
+ out_close_in:
+	os_close_file(in_fds[0]);
+	os_close_file(in_fds[1]);
+ out_close_out:
+	os_close_file(out_fds[0]);
+	os_close_file(out_fds[1]);
+ out:
+	return(err);
+}
+
+void stop_watchdog(int in_fd, int out_fd)
+{
+	os_close_file(in_fd);
+	os_close_file(out_fd);
+}
+
+int ping_watchdog(int fd)
+{
+	int n;
+	char c = '\n';
+
+	n = os_write_file(fd, &c, sizeof(c));
+	if(n != sizeof(c)){
+		printk("ping_watchdog - write failed, err = %d\n", -n);
+		if(n < 0)
+			return(n);
+		return(-EIO);
+	}
+	return 1;
+
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
new file mode 100644
index 00000000000..d5742783e19
--- /dev/null
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -0,0 +1,352 @@
+/* 
+ * Copyright (C) 2002 Steve Schmidtke 
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/module.h"
+#include "linux/init.h"
+#include "linux/slab.h"
+#include "linux/fs.h"
+#include "linux/sound.h"
+#include "linux/soundcard.h"
+#include "asm/uaccess.h"
+#include "kern_util.h"
+#include "init.h"
+#include "os.h"
+
+struct hostaudio_state {
+  int fd;
+};
+
+struct hostmixer_state {
+  int fd;
+};
+
+#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
+#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
+
+/* Only changed from linux_main at boot time */
+char *dsp = HOSTAUDIO_DEV_DSP;
+char *mixer = HOSTAUDIO_DEV_MIXER;
+
+#define DSP_HELP \
+"    This is used to specify the host dsp device to the hostaudio driver.\n" \
+"    The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
+
+#define MIXER_HELP \
+"    This is used to specify the host mixer device to the hostaudio driver.\n"\
+"    The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
+
+#ifndef MODULE
+static int set_dsp(char *name, int *add)
+{
+	dsp = name;
+	return(0);
+}
+
+__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
+
+static int set_mixer(char *name, int *add)
+{
+	mixer = name;
+	return(0);
+}
+
+__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
+
+#else /*MODULE*/
+
+MODULE_PARM(dsp, "s");
+MODULE_PARM_DESC(dsp, DSP_HELP);
+
+MODULE_PARM(mixer, "s");
+MODULE_PARM_DESC(mixer, MIXER_HELP);
+
+#endif
+
+/* /dev/dsp file operations */
+
+static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count, 
+			      loff_t *ppos)
+{
+        struct hostaudio_state *state = file->private_data;
+	void *kbuf;
+	int err;
+
+#ifdef DEBUG
+        printk("hostaudio: read called, count = %d\n", count);
+#endif
+
+	kbuf = kmalloc(count, GFP_KERNEL);
+	if(kbuf == NULL)
+		return(-ENOMEM);
+
+	err = os_read_file(state->fd, kbuf, count);
+	if(err < 0)
+		goto out;
+
+	if(copy_to_user(buffer, kbuf, err))
+		err = -EFAULT;
+
+ out:
+	kfree(kbuf);
+	return(err);
+}
+
+static ssize_t hostaudio_write(struct file *file, const char *buffer, 
+			       size_t count, loff_t *ppos)
+{
+        struct hostaudio_state *state = file->private_data;
+	void *kbuf;
+	int err;
+
+#ifdef DEBUG
+        printk("hostaudio: write called, count = %d\n", count);
+#endif
+
+	kbuf = kmalloc(count, GFP_KERNEL);
+	if(kbuf == NULL)
+		return(-ENOMEM);
+
+	err = -EFAULT;
+	if(copy_from_user(kbuf, buffer, count))
+		goto out;
+
+	err = os_write_file(state->fd, kbuf, count);
+	if(err < 0)
+		goto out;
+	*ppos += err;
+
+ out:
+	kfree(kbuf);
+	return(err);
+}
+
+static unsigned int hostaudio_poll(struct file *file, 
+				   struct poll_table_struct *wait)
+{
+        unsigned int mask = 0;
+
+#ifdef DEBUG
+        printk("hostaudio: poll called (unimplemented)\n");
+#endif
+
+        return(mask);
+}
+
+static int hostaudio_ioctl(struct inode *inode, struct file *file, 
+			   unsigned int cmd, unsigned long arg)
+{
+        struct hostaudio_state *state = file->private_data;
+	unsigned long data = 0;
+	int err;
+
+#ifdef DEBUG
+        printk("hostaudio: ioctl called, cmd = %u\n", cmd);
+#endif
+	switch(cmd){
+	case SNDCTL_DSP_SPEED:
+	case SNDCTL_DSP_STEREO:
+	case SNDCTL_DSP_GETBLKSIZE:
+	case SNDCTL_DSP_CHANNELS:
+	case SNDCTL_DSP_SUBDIVIDE:
+	case SNDCTL_DSP_SETFRAGMENT:
+		if(get_user(data, (int *) arg))
+			return(-EFAULT);
+		break;
+	default:
+		break;
+	}
+
+	err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
+
+	switch(cmd){
+	case SNDCTL_DSP_SPEED:
+	case SNDCTL_DSP_STEREO:
+	case SNDCTL_DSP_GETBLKSIZE:
+	case SNDCTL_DSP_CHANNELS:
+	case SNDCTL_DSP_SUBDIVIDE:
+	case SNDCTL_DSP_SETFRAGMENT:
+		if(put_user(data, (int *) arg))
+			return(-EFAULT);
+		break;
+	default:
+		break;
+	}
+
+	return(err);
+}
+
+static int hostaudio_open(struct inode *inode, struct file *file)
+{
+        struct hostaudio_state *state;
+        int r = 0, w = 0;
+        int ret;
+
+#ifdef DEBUG
+        printk("hostaudio: open called (host: %s)\n", dsp);
+#endif
+
+        state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
+        if(state == NULL)
+		return(-ENOMEM);
+
+        if(file->f_mode & FMODE_READ) r = 1;
+        if(file->f_mode & FMODE_WRITE) w = 1;
+
+	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+        if(ret < 0){
+		kfree(state);
+		return(ret);
+        }
+
+	state->fd = ret;
+        file->private_data = state;
+        return(0);
+}
+
+static int hostaudio_release(struct inode *inode, struct file *file)
+{
+        struct hostaudio_state *state = file->private_data;
+
+#ifdef DEBUG
+        printk("hostaudio: release called\n");
+#endif
+
+		os_close_file(state->fd);
+        kfree(state);
+
+	return(0);
+}
+
+/* /dev/mixer file operations */
+
+static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file, 
+				  unsigned int cmd, unsigned long arg)
+{
+        struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+        printk("hostmixer: ioctl called\n");
+#endif
+
+	return(os_ioctl_generic(state->fd, cmd, arg));
+}
+
+static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
+{
+        struct hostmixer_state *state;
+        int r = 0, w = 0;
+        int ret;
+
+#ifdef DEBUG
+        printk("hostmixer: open called (host: %s)\n", mixer);
+#endif
+
+        state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
+        if(state == NULL) return(-ENOMEM);
+
+        if(file->f_mode & FMODE_READ) r = 1;
+        if(file->f_mode & FMODE_WRITE) w = 1;
+
+	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+        
+        if(ret < 0){
+		printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
+		       dsp, -ret);
+		kfree(state);
+		return(ret);
+        }
+
+        file->private_data = state;
+        return(0);
+}
+
+static int hostmixer_release(struct inode *inode, struct file *file)
+{
+        struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+        printk("hostmixer: release called\n");
+#endif
+
+		os_close_file(state->fd);
+        kfree(state);
+
+	return(0);
+}
+
+
+/* kernel module operations */
+
+static struct file_operations hostaudio_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .read           = hostaudio_read,
+        .write          = hostaudio_write,
+        .poll           = hostaudio_poll,
+        .ioctl          = hostaudio_ioctl,
+        .mmap           = NULL,
+        .open           = hostaudio_open,
+        .release        = hostaudio_release,
+};
+
+static struct file_operations hostmixer_fops = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .ioctl          = hostmixer_ioctl_mixdev,
+        .open           = hostmixer_open_mixdev,
+        .release        = hostmixer_release,
+};
+
+struct {
+	int dev_audio;
+	int dev_mixer;
+} module_data;
+
+MODULE_AUTHOR("Steve Schmidtke");
+MODULE_DESCRIPTION("UML Audio Relay");
+MODULE_LICENSE("GPL");
+
+static int __init hostaudio_init_module(void)
+{
+        printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+	       dsp, mixer);
+
+	module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
+        if(module_data.dev_audio < 0){
+                printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
+                return -ENODEV;
+        }
+
+	module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
+        if(module_data.dev_mixer < 0){
+                printk(KERN_ERR "hostmixer: couldn't register mixer "
+		       "device!\n");
+                unregister_sound_dsp(module_data.dev_audio);
+                return -ENODEV;
+        }
+
+        return 0;
+}
+
+static void __exit hostaudio_cleanup_module (void)
+{
+       unregister_sound_mixer(module_data.dev_mixer);
+       unregister_sound_dsp(module_data.dev_audio);
+}
+
+module_init(hostaudio_init_module);
+module_exit(hostaudio_cleanup_module);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
new file mode 100644
index 00000000000..6924f273ced
--- /dev/null
+++ b/arch/um/drivers/line.c
@@ -0,0 +1,681 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/slab.h"
+#include "linux/list.h"
+#include "linux/kd.h"
+#include "linux/interrupt.h"
+#include "linux/devfs_fs_kernel.h"
+#include "asm/uaccess.h"
+#include "chan_kern.h"
+#include "irq_user.h"
+#include "line.h"
+#include "kern.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "os.h"
+#include "irq_kern.h"
+
+#define LINE_BUFSIZE 4096
+
+static irqreturn_t line_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+	struct tty_struct *tty = data;
+	struct line *line = tty->driver_data;
+
+	if (line)
+		chan_interrupt(&line->chan_list, &line->task, tty, irq);
+	return IRQ_HANDLED;
+}
+
+static void line_timer_cb(void *arg)
+{
+	struct tty_struct *tty = arg;
+	struct line *line = tty->driver_data;
+
+	line_interrupt(line->driver->read_irq, arg, NULL);
+}
+
+static int write_room(struct line *dev)
+{
+	int n;
+
+	if (dev->buffer == NULL)
+		return (LINE_BUFSIZE - 1);
+
+	n = dev->head - dev->tail;
+	if (n <= 0)
+		n = LINE_BUFSIZE + n;
+	return (n - 1);
+}
+
+static int buffer_data(struct line *line, const char *buf, int len)
+{
+	int end, room;
+
+	if(line->buffer == NULL){
+		line->buffer = kmalloc(LINE_BUFSIZE, GFP_ATOMIC);
+		if (line->buffer == NULL) {
+			printk("buffer_data - atomic allocation failed\n");
+			return(0);
+		}
+		line->head = line->buffer;
+		line->tail = line->buffer;
+	}
+
+	room = write_room(line);
+	len = (len > room) ? room : len;
+
+	end = line->buffer + LINE_BUFSIZE - line->tail;
+	if(len < end){
+		memcpy(line->tail, buf, len);
+		line->tail += len;
+	}
+	else {
+		memcpy(line->tail, buf, end);
+		buf += end;
+		memcpy(line->buffer, buf, len - end);
+		line->tail = line->buffer + len - end;
+	}
+
+	return(len);
+}
+
+static int flush_buffer(struct line *line)
+{
+	int n, count;
+
+	if ((line->buffer == NULL) || (line->head == line->tail))
+		return(1);
+
+	if (line->tail < line->head) {
+		count = line->buffer + LINE_BUFSIZE - line->head;
+		n = write_chan(&line->chan_list, line->head, count,
+			       line->driver->write_irq);
+		if (n < 0)
+			return(n);
+		if (n == count)
+			line->head = line->buffer;
+		else {
+			line->head += n;
+			return(0);
+		}
+	}
+
+	count = line->tail - line->head;
+	n = write_chan(&line->chan_list, line->head, count, 
+		       line->driver->write_irq);
+	if(n < 0) return(n);
+
+	line->head += n;
+	return(line->head == line->tail);
+}
+
+int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
+{
+	struct line *line = tty->driver_data;
+	unsigned long flags;
+	int n, err, ret = 0;
+
+	if(tty->stopped) return 0;
+
+	down(&line->sem);
+	if(line->head != line->tail){
+		local_irq_save(flags);
+		ret = buffer_data(line, buf, len);
+		err = flush_buffer(line);
+		local_irq_restore(flags);
+		if(err <= 0 && (err != -EAGAIN || !ret))
+			ret = err;
+	}
+	else {
+		n = write_chan(&line->chan_list, buf, len, 
+			       line->driver->write_irq);
+		if(n < 0){
+			ret = n;
+			goto out_up;
+		}
+
+		len -= n;
+		ret += n;
+		if(len > 0)
+			ret += buffer_data(line, buf + n, len);
+	}
+ out_up:
+	up(&line->sem);
+	return(ret);
+}
+
+void line_put_char(struct tty_struct *tty, unsigned char ch)
+{
+	line_write(tty, &ch, sizeof(ch));
+}
+
+void line_set_termios(struct tty_struct *tty, struct termios * old)
+{
+	/* nothing */
+}
+
+int line_chars_in_buffer(struct tty_struct *tty)
+{
+	return 0;
+}
+
+static struct {
+	int  cmd;
+	char *level;
+	char *name;
+} tty_ioctls[] = {
+	/* don't print these, they flood the log ... */
+	{ TCGETS,      NULL,       "TCGETS"      },
+        { TCSETS,      NULL,       "TCSETS"      },
+        { TCSETSW,     NULL,       "TCSETSW"     },
+        { TCFLSH,      NULL,       "TCFLSH"      },
+        { TCSBRK,      NULL,       "TCSBRK"      },
+
+	/* general tty stuff */
+        { TCSETSF,     KERN_DEBUG, "TCSETSF"     },
+        { TCGETA,      KERN_DEBUG, "TCGETA"      },
+        { TIOCMGET,    KERN_DEBUG, "TIOCMGET"    },
+        { TCSBRKP,     KERN_DEBUG, "TCSBRKP"     },
+        { TIOCMSET,    KERN_DEBUG, "TIOCMSET"    },
+
+	/* linux-specific ones */
+	{ TIOCLINUX,   KERN_INFO,  "TIOCLINUX"   },
+	{ KDGKBMODE,   KERN_INFO,  "KDGKBMODE"   },
+	{ KDGKBTYPE,   KERN_INFO,  "KDGKBTYPE"   },
+	{ KDSIGACCEPT, KERN_INFO,  "KDSIGACCEPT" },
+};
+
+int line_ioctl(struct tty_struct *tty, struct file * file,
+	       unsigned int cmd, unsigned long arg)
+{
+	int ret;
+	int i;
+
+	ret = 0;
+	switch(cmd) {
+#ifdef TIOCGETP
+	case TIOCGETP:
+	case TIOCSETP:
+	case TIOCSETN:
+#endif
+#ifdef TIOCGETC
+	case TIOCGETC:
+	case TIOCSETC:
+#endif
+#ifdef TIOCGLTC
+	case TIOCGLTC:
+	case TIOCSLTC:
+#endif
+	case TCGETS:
+	case TCSETSF:
+	case TCSETSW:
+	case TCSETS:
+	case TCGETA:
+	case TCSETAF:
+	case TCSETAW:
+	case TCSETA:
+	case TCXONC:
+	case TCFLSH:
+	case TIOCOUTQ:
+	case TIOCINQ:
+	case TIOCGLCKTRMIOS:
+	case TIOCSLCKTRMIOS:
+	case TIOCPKT:
+	case TIOCGSOFTCAR:
+	case TIOCSSOFTCAR:
+		return -ENOIOCTLCMD;
+#if 0
+	case TCwhatever:
+		/* do something */
+		break;
+#endif
+	default:
+		for (i = 0; i < ARRAY_SIZE(tty_ioctls); i++)
+			if (cmd == tty_ioctls[i].cmd)
+				break;
+		if (i < ARRAY_SIZE(tty_ioctls)) {
+			if (NULL != tty_ioctls[i].level)
+				printk("%s%s: %s: ioctl %s called\n",
+				       tty_ioctls[i].level, __FUNCTION__,
+				       tty->name, tty_ioctls[i].name);
+		} else {
+			printk(KERN_ERR "%s: %s: unknown ioctl: 0x%x\n",
+			       __FUNCTION__, tty->name, cmd);
+		}
+		ret = -ENOIOCTLCMD;
+		break;
+	}
+	return(ret);
+}
+
+static irqreturn_t line_write_interrupt(int irq, void *data,
+					struct pt_regs *unused)
+{
+	struct tty_struct *tty = data;
+	struct line *line = tty->driver_data;
+	int err;
+
+	err = flush_buffer(line);
+	if(err == 0)
+		return(IRQ_NONE);
+	else if(err < 0){
+		line->head = line->buffer;
+		line->tail = line->buffer;
+	}
+
+	if(tty == NULL)
+		return(IRQ_NONE);
+
+	if(test_bit(TTY_DO_WRITE_WAKEUP, &tty->flags) &&
+	   (tty->ldisc.write_wakeup != NULL))
+		(tty->ldisc.write_wakeup)(tty);
+	
+	/* BLOCKING mode
+	 * In blocking mode, everything sleeps on tty->write_wait.
+	 * Sleeping in the console driver would break non-blocking
+	 * writes.
+	 */
+
+	if(waitqueue_active(&tty->write_wait))
+		wake_up_interruptible(&tty->write_wait);
+	return(IRQ_HANDLED);
+}
+
+int line_setup_irq(int fd, int input, int output, struct tty_struct *tty)
+{
+	struct line *line = tty->driver_data;
+	struct line_driver *driver = line->driver;
+	int err = 0, flags = SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM;
+
+	if(input) err = um_request_irq(driver->read_irq, fd, IRQ_READ, 
+				       line_interrupt, flags, 
+				       driver->read_irq_name, tty);
+	if(err) return(err);
+	if(output) err = um_request_irq(driver->write_irq, fd, IRQ_WRITE, 
+					line_write_interrupt, flags, 
+					driver->write_irq_name, tty);
+	line->have_irq = 1;
+	return(err);
+}
+
+void line_disable(struct tty_struct *tty, int current_irq)
+{
+	struct line *line = tty->driver_data;
+
+	if(!line->have_irq)
+		return;
+
+	if(line->driver->read_irq == current_irq)
+		free_irq_later(line->driver->read_irq, tty);
+	else {
+		free_irq_by_irq_and_dev(line->driver->read_irq, tty);
+		free_irq(line->driver->read_irq, tty);
+	}
+
+	if(line->driver->write_irq == current_irq)
+		free_irq_later(line->driver->write_irq, tty);
+	else {
+		free_irq_by_irq_and_dev(line->driver->write_irq, tty);
+		free_irq(line->driver->write_irq, tty);
+	}
+
+	line->have_irq = 0;
+}
+
+int line_open(struct line *lines, struct tty_struct *tty,
+	      struct chan_opts *opts)
+{
+	struct line *line;
+	int err = 0;
+
+	line = &lines[tty->index];
+	tty->driver_data = line;
+
+	down(&line->sem);
+	if (tty->count == 1) {
+		if (!line->valid) {
+			err = -ENODEV;
+			goto out;
+		}
+		if (list_empty(&line->chan_list)) {
+			err = parse_chan_pair(line->init_str, &line->chan_list,
+					      line->init_pri, tty->index, opts);
+			if(err) goto out;
+			err = open_chan(&line->chan_list);
+			if(err) goto out;
+		}
+		enable_chan(&line->chan_list, tty);
+		INIT_WORK(&line->task, line_timer_cb, tty);
+	}
+
+	if(!line->sigio){
+		chan_enable_winch(&line->chan_list, tty);
+		line->sigio = 1;
+	}
+	chan_window_size(&line->chan_list, &tty->winsize.ws_row,
+			 &tty->winsize.ws_col);
+	line->count++;
+
+out:
+	up(&line->sem);
+	return(err);
+}
+
+void line_close(struct tty_struct *tty, struct file * filp)
+{
+	struct line *line = tty->driver_data;
+
+	down(&line->sem);
+	line->count--;
+	if (tty->count == 1) {
+		line_disable(tty, -1);
+		tty->driver_data = NULL;
+	}
+	up(&line->sem);
+}
+
+void close_lines(struct line *lines, int nlines)
+{
+	int i;
+
+	for(i = 0; i < nlines; i++)
+		close_chan(&lines[i].chan_list);
+}
+
+int line_setup(struct line *lines, int num, char *init, int all_allowed)
+{
+	int i, n;
+	char *end;
+
+	if(*init == '=') n = -1;
+	else {
+		n = simple_strtoul(init, &end, 0);
+		if(*end != '='){
+			printk(KERN_ERR "line_setup failed to parse \"%s\"\n", 
+			       init);
+			return(0);
+		}
+		init = end;
+	}
+	init++;
+	if((n >= 0) && (n >= num)){
+		printk("line_setup - %d out of range ((0 ... %d) allowed)\n",
+		       n, num - 1);
+		return(0);
+	}
+	else if (n >= 0){
+		if (lines[n].count > 0) {
+			printk("line_setup - device %d is open\n", n);
+			return(0);
+		}
+		if (lines[n].init_pri <= INIT_ONE){
+			lines[n].init_pri = INIT_ONE;
+			if (!strcmp(init, "none"))
+				lines[n].valid = 0;
+			else {
+				lines[n].init_str = init;
+				lines[n].valid = 1;
+			}	
+		}
+	}
+	else if(!all_allowed){
+		printk("line_setup - can't configure all devices from "
+		       "mconsole\n");
+		return(0);
+	}
+	else {
+		for(i = 0; i < num; i++){
+			if(lines[i].init_pri <= INIT_ALL){
+				lines[i].init_pri = INIT_ALL;
+				if(!strcmp(init, "none")) lines[i].valid = 0;
+				else {
+					lines[i].init_str = init;
+					lines[i].valid = 1;
+				}
+			}
+		}
+	}
+	return(1);
+}
+
+int line_config(struct line *lines, int num, char *str)
+{
+	char *new = uml_strdup(str);
+
+	if(new == NULL){
+		printk("line_config - uml_strdup failed\n");
+		return(-ENOMEM);
+	}
+	return(!line_setup(lines, num, new, 0));
+}
+
+int line_get_config(char *name, struct line *lines, int num, char *str, 
+		    int size, char **error_out)
+{
+	struct line *line;
+	char *end;
+	int dev, n = 0;
+
+	dev = simple_strtoul(name, &end, 0);
+	if((*end != '\0') || (end == name)){
+		*error_out = "line_get_config failed to parse device number";
+		return(0);
+	}
+
+	if((dev < 0) || (dev >= num)){
+		*error_out = "device number of of range";
+		return(0);
+	}
+
+	line = &lines[dev];
+
+	down(&line->sem);
+	if(!line->valid)
+		CONFIG_CHUNK(str, size, n, "none", 1);
+	else if(line->count == 0)
+		CONFIG_CHUNK(str, size, n, line->init_str, 1);
+	else n = chan_config_string(&line->chan_list, str, size, error_out);
+	up(&line->sem);
+
+	return(n);
+}
+
+int line_remove(struct line *lines, int num, char *str)
+{
+	char config[sizeof("conxxxx=none\0")];
+
+	sprintf(config, "%s=none", str);
+	return(!line_setup(lines, num, config, 0));
+}
+
+int line_write_room(struct tty_struct *tty)
+{
+	struct line *dev = tty->driver_data;
+	int room;
+
+	if (tty->stopped)
+		return 0;
+	room = write_room(dev);
+	if (0 == room)
+		printk(KERN_DEBUG "%s: %s: no room left in buffer\n",
+		       __FUNCTION__,tty->name);
+	return room;
+}
+
+struct tty_driver *line_register_devfs(struct lines *set,
+			 struct line_driver *line_driver, 
+			 struct tty_operations *ops, struct line *lines,
+			 int nlines)
+{
+	int i;
+	struct tty_driver *driver = alloc_tty_driver(nlines);
+
+	if (!driver)
+		return NULL;
+
+	driver->driver_name = line_driver->name;
+	driver->name = line_driver->device_name;
+	driver->devfs_name = line_driver->devfs_name;
+	driver->major = line_driver->major;
+	driver->minor_start = line_driver->minor_start;
+	driver->type = line_driver->type;
+	driver->subtype = line_driver->subtype;
+	driver->flags = TTY_DRIVER_REAL_RAW;
+	driver->init_termios = tty_std_termios;
+	tty_set_operations(driver, ops);
+
+	if (tty_register_driver(driver)) {
+		printk("%s: can't register %s driver\n",
+		       __FUNCTION__,line_driver->name);
+		put_tty_driver(driver);
+		return NULL;
+	}
+
+	for(i = 0; i < nlines; i++){
+		if(!lines[i].valid) 
+			tty_unregister_device(driver, i);
+	}
+
+	mconsole_register_dev(&line_driver->mc);
+	return driver;
+}
+
+void lines_init(struct line *lines, int nlines)
+{
+	struct line *line;
+	int i;
+
+	for(i = 0; i < nlines; i++){
+		line = &lines[i];
+		INIT_LIST_HEAD(&line->chan_list);
+		sema_init(&line->sem, 1);
+		if(line->init_str != NULL){
+			line->init_str = uml_strdup(line->init_str);
+			if(line->init_str == NULL)
+				printk("lines_init - uml_strdup returned "
+				       "NULL\n");
+		}
+	}
+}
+
+struct winch {
+	struct list_head list;
+	int fd;
+	int tty_fd;
+	int pid;
+	struct tty_struct *tty;
+};
+
+irqreturn_t winch_interrupt(int irq, void *data, struct pt_regs *unused)
+{
+	struct winch *winch = data;
+	struct tty_struct *tty;
+	struct line *line;
+	int err;
+	char c;
+
+	if(winch->fd != -1){
+		err = generic_read(winch->fd, &c, NULL);
+		if(err < 0){
+			if(err != -EAGAIN){
+				printk("winch_interrupt : read failed, "
+				       "errno = %d\n", -err);
+				printk("fd %d is losing SIGWINCH support\n",
+				       winch->tty_fd);
+				return(IRQ_HANDLED);
+			}
+			goto out;
+		}
+	}
+	tty  = winch->tty;
+	if (tty != NULL) {
+		line = tty->driver_data;
+		chan_window_size(&line->chan_list,
+				 &tty->winsize.ws_row, 
+				 &tty->winsize.ws_col);
+		kill_pg(tty->pgrp, SIGWINCH, 1);
+	}
+ out:
+	if(winch->fd != -1)
+		reactivate_fd(winch->fd, WINCH_IRQ);
+	return(IRQ_HANDLED);
+}
+
+DECLARE_MUTEX(winch_handler_sem);
+LIST_HEAD(winch_handlers);
+
+void register_winch_irq(int fd, int tty_fd, int pid, struct tty_struct *tty)
+{
+	struct winch *winch;
+
+	down(&winch_handler_sem);
+	winch = kmalloc(sizeof(*winch), GFP_KERNEL);
+	if (winch == NULL) {
+		printk("register_winch_irq - kmalloc failed\n");
+		goto out;
+	}
+	*winch = ((struct winch) { .list  	= LIST_HEAD_INIT(winch->list),
+				   .fd  	= fd,
+				   .tty_fd 	= tty_fd,
+				   .pid  	= pid,
+				   .tty 	= tty });
+	list_add(&winch->list, &winch_handlers);
+	if(um_request_irq(WINCH_IRQ, fd, IRQ_READ, winch_interrupt, 
+			  SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+			  "winch", winch) < 0)
+		printk("register_winch_irq - failed to register IRQ\n");
+ out:
+	up(&winch_handler_sem);
+}
+
+static void winch_cleanup(void)
+{
+	struct list_head *ele;
+	struct winch *winch;
+
+	list_for_each(ele, &winch_handlers){
+		winch = list_entry(ele, struct winch, list);
+		if(winch->fd != -1){
+			deactivate_fd(winch->fd, WINCH_IRQ);
+			os_close_file(winch->fd);
+		}
+		if(winch->pid != -1) 
+			os_kill_process(winch->pid, 1);
+	}
+}
+__uml_exitcall(winch_cleanup);
+
+char *add_xterm_umid(char *base)
+{
+	char *umid, *title;
+	int len;
+
+	umid = get_umid(1);
+	if(umid == NULL) return(base);
+	
+	len = strlen(base) + strlen(" ()") + strlen(umid) + 1;
+	title = kmalloc(len, GFP_KERNEL);
+	if(title == NULL){
+		printk("Failed to allocate buffer for xterm title\n");
+		return(base);
+	}
+
+	snprintf(title, len, "%s (%s)", base, umid);
+	return(title);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mcast.h b/arch/um/drivers/mcast.h
new file mode 100644
index 00000000000..a2c6db24345
--- /dev/null
+++ b/arch/um/drivers/mcast.h
@@ -0,0 +1,30 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "net_user.h"
+
+struct mcast_data {
+	char *addr;
+	unsigned short port;
+	void *mcast_addr;
+	int ttl;
+	void *dev;
+};
+
+extern struct net_user_info mcast_user_info;
+
+extern int mcast_user_write(int fd, void *buf, int len, 
+			    struct mcast_data *pri);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
new file mode 100644
index 00000000000..faf714e87b5
--- /dev/null
+++ b/arch/um/drivers/mcast_kern.c
@@ -0,0 +1,143 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ */
+
+#include "linux/kernel.h"
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "linux/in.h"
+#include "linux/inet.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "mcast.h"
+
+struct mcast_init {
+	char *addr;
+	int port;
+	int ttl;
+};
+
+void mcast_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct mcast_data *dpri;
+	struct mcast_init *init = data;
+
+	pri = dev->priv;
+	dpri = (struct mcast_data *) pri->user;
+	dpri->addr = init->addr;
+	dpri->port = init->port;
+	dpri->ttl = init->ttl;
+	dpri->dev = dev;
+
+	printk("mcast backend ");
+	printk("multicast adddress: %s:%u, TTL:%u ",
+	       dpri->addr, dpri->port, dpri->ttl);
+
+	printk("\n");
+}
+
+static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
+	if(*skb == NULL) return(-ENOMEM);
+	return(net_recvfrom(fd, (*skb)->mac.raw, 
+			    (*skb)->dev->mtu + ETH_HEADER_OTHER));
+}
+
+static int mcast_write(int fd, struct sk_buff **skb,
+			struct uml_net_private *lp)
+{
+	return mcast_user_write(fd, (*skb)->data, (*skb)->len, 
+				 (struct mcast_data *) &lp->user);
+}
+
+static struct net_kern_info mcast_kern_info = {
+	.init			= mcast_init,
+	.protocol		= eth_protocol,
+	.read			= mcast_read,
+	.write			= mcast_write,
+};
+
+int mcast_setup(char *str, char **mac_out, void *data)
+{
+	struct mcast_init *init = data;
+	char *port_str = NULL, *ttl_str = NULL, *remain;
+	char *last;
+	int n;
+
+	*init = ((struct mcast_init)
+		{ .addr 	= "239.192.168.1",
+		  .port 	= 1102,
+		  .ttl 		= 1 });
+
+	remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
+			       NULL);
+	if(remain != NULL){
+		printk(KERN_ERR "mcast_setup - Extra garbage on "
+		       "specification : '%s'\n", remain);
+		return(0);
+	}
+	
+	if(port_str != NULL){
+		n = simple_strtoul(port_str, &last, 10);
+		if((*last != '\0') || (last == port_str)){
+			printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", 
+			       port_str);
+			return(0);
+		}
+		init->port = htons(n);
+	}
+
+	if(ttl_str != NULL){
+		init->ttl = simple_strtoul(ttl_str, &last, 10);
+		if((*last != '\0') || (last == ttl_str)){
+			printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n", 
+			       ttl_str);
+			return(0);
+		}
+	}
+
+	printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
+	       init->port, init->ttl);
+
+	return(1);
+}
+
+static struct transport mcast_transport = {
+	.list 		= LIST_HEAD_INIT(mcast_transport.list),
+	.name 		= "mcast",
+	.setup  	= mcast_setup,
+	.user 		= &mcast_user_info,
+	.kern 		= &mcast_kern_info,
+	.private_size 	= sizeof(struct mcast_data),
+	.setup_size 	= sizeof(struct mcast_init),
+};
+
+static int register_mcast(void)
+{
+	register_transport(&mcast_transport);
+	return(1);
+}
+
+__initcall(register_mcast);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
new file mode 100644
index 00000000000..0fe1d9fa913
--- /dev/null
+++ b/arch/um/drivers/mcast_user.c
@@ -0,0 +1,177 @@
+/*
+ * user-mode-linux networking multicast transport
+ * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
+ *
+ * based on the existing uml-networking code, which is
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ *
+ * Licensed under the GPL.
+ *
+ */
+
+#include <errno.h>
+#include <unistd.h>
+#include <linux/inet.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/time.h>
+#include <netinet/in.h>
+#include "net_user.h"
+#include "mcast.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "user.h"
+#include "os.h"
+
+#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
+
+static struct sockaddr_in *new_addr(char *addr, unsigned short port)
+{
+	struct sockaddr_in *sin;
+
+	sin = um_kmalloc(sizeof(struct sockaddr_in));
+	if(sin == NULL){
+		printk("new_addr: allocation of sockaddr_in failed\n");
+		return(NULL);
+	}
+	sin->sin_family = AF_INET;
+	sin->sin_addr.s_addr = in_aton(addr);
+	sin->sin_port = port;
+	return(sin);
+}
+
+static void mcast_user_init(void *data, void *dev)
+{
+	struct mcast_data *pri = data;
+
+	pri->mcast_addr = new_addr(pri->addr, pri->port);
+	pri->dev = dev;
+}
+
+static int mcast_open(void *data)
+{
+	struct mcast_data *pri = data;
+	struct sockaddr_in *sin = pri->mcast_addr;
+	struct ip_mreq mreq;
+	int fd, yes = 1;
+
+
+	if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0)) {
+		fd = -EINVAL;
+		goto out;
+	}
+
+	fd = socket(AF_INET, SOCK_DGRAM, 0);
+	if (fd < 0){
+		printk("mcast_open : data socket failed, errno = %d\n", 
+		       errno);
+		fd = -ENOMEM;
+		goto out;
+	}
+
+	if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
+		printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
+			errno);
+		os_close_file(fd);
+		fd = -EINVAL;
+		goto out;
+	}
+
+	/* set ttl according to config */
+	if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl,
+		       sizeof(pri->ttl)) < 0) {
+		printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
+			errno);
+		os_close_file(fd);
+		fd = -EINVAL;
+		goto out;
+	}
+
+	/* set LOOP, so data does get fed back to local sockets */
+	if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
+		printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
+			errno);
+		os_close_file(fd);
+		fd = -EINVAL;
+		goto out;
+	}
+
+	/* bind socket to mcast address */
+	if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
+		printk("mcast_open : data bind failed, errno = %d\n", errno);
+		os_close_file(fd);
+		fd = -EINVAL;
+		goto out;
+	}		
+	
+	/* subscribe to the multicast group */
+	mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
+	mreq.imr_interface.s_addr = 0;
+	if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, 
+		       &mreq, sizeof(mreq)) < 0) {
+		printk("mcast_open: IP_ADD_MEMBERSHIP failed, error = %d\n",
+			errno);
+		printk("There appears not to be a multicast-capable network "
+		       "interface on the host.\n");
+		printk("eth0 should be configured in order to use the "
+		       "multicast transport.\n");
+		os_close_file(fd);
+		fd = -EINVAL;
+	}
+
+ out:
+	return(fd);
+}
+
+static void mcast_close(int fd, void *data)
+{
+	struct ip_mreq mreq;
+	struct mcast_data *pri = data;
+	struct sockaddr_in *sin = pri->mcast_addr;
+
+	mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr;
+	mreq.imr_interface.s_addr = 0;
+	if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP,
+		       &mreq, sizeof(mreq)) < 0) {
+		printk("mcast_open: IP_DROP_MEMBERSHIP failed, error = %d\n",
+			errno);
+	}
+
+	os_close_file(fd);
+}
+
+int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri)
+{
+	struct sockaddr_in *data_addr = pri->mcast_addr;
+
+	return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
+}
+
+static int mcast_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info mcast_user_info = {
+	.init		= mcast_user_init,
+	.open		= mcast_open,
+	.close	 	= mcast_close,
+	.remove	 	= NULL,
+	.set_mtu	= mcast_set_mtu,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= MAX_PACKET - ETH_HEADER_OTHER
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
new file mode 100644
index 00000000000..d7c7adcc0a6
--- /dev/null
+++ b/arch/um/drivers/mconsole_kern.c
@@ -0,0 +1,619 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/slab.h"
+#include "linux/init.h"
+#include "linux/notifier.h"
+#include "linux/reboot.h"
+#include "linux/utsname.h"
+#include "linux/ctype.h"
+#include "linux/interrupt.h"
+#include "linux/sysrq.h"
+#include "linux/workqueue.h"
+#include "linux/module.h"
+#include "linux/file.h"
+#include "linux/fs.h"
+#include "linux/namei.h"
+#include "linux/proc_fs.h"
+#include "linux/syscalls.h"
+#include "asm/irq.h"
+#include "asm/uaccess.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "mconsole.h"
+#include "mconsole_kern.h"
+#include "irq_user.h"
+#include "init.h"
+#include "os.h"
+#include "umid.h"
+#include "irq_kern.h"
+
+static int do_unlink_socket(struct notifier_block *notifier, 
+			    unsigned long what, void *data)
+{
+	return(mconsole_unlink_socket());
+}
+
+
+static struct notifier_block reboot_notifier = {
+	.notifier_call		= do_unlink_socket,
+	.priority		= 0,
+};
+
+/* Safe without explicit locking for now.  Tasklets provide their own 
+ * locking, and the interrupt handler is safe because it can't interrupt
+ * itself and it can only happen on CPU 0.
+ */
+
+LIST_HEAD(mc_requests);
+
+static void mc_work_proc(void *unused)
+{
+	struct mconsole_entry *req;
+	unsigned long flags;
+
+	while(!list_empty(&mc_requests)){
+		local_save_flags(flags);
+		req = list_entry(mc_requests.next, struct mconsole_entry, 
+				 list);
+		list_del(&req->list);
+		local_irq_restore(flags);
+		req->request.cmd->handler(&req->request);
+		kfree(req);
+	}
+}
+
+DECLARE_WORK(mconsole_work, mc_work_proc, NULL);
+
+static irqreturn_t mconsole_interrupt(int irq, void *dev_id,
+				      struct pt_regs *regs)
+{
+	/* long to avoid size mismatch warnings from gcc */
+	long fd;
+	struct mconsole_entry *new;
+	struct mc_request req;
+
+	fd = (long) dev_id;
+	while (mconsole_get_request(fd, &req)){
+		if(req.cmd->context == MCONSOLE_INTR)
+			(*req.cmd->handler)(&req);
+		else {
+			new = kmalloc(sizeof(*new), GFP_ATOMIC);
+			if(new == NULL)
+				mconsole_reply(&req, "Out of memory", 1, 0);
+			else {
+				new->request = req;
+				list_add(&new->list, &mc_requests);
+			}
+		}
+	}
+	if(!list_empty(&mc_requests))
+		schedule_work(&mconsole_work);
+	reactivate_fd(fd, MCONSOLE_IRQ);
+	return(IRQ_HANDLED);
+}
+
+void mconsole_version(struct mc_request *req)
+{
+	char version[256];
+
+	sprintf(version, "%s %s %s %s %s", system_utsname.sysname, 
+		system_utsname.nodename, system_utsname.release, 
+		system_utsname.version, system_utsname.machine);
+	mconsole_reply(req, version, 0, 0);
+}
+
+void mconsole_log(struct mc_request *req)
+{
+	int len;
+	char *ptr = req->request.data;
+
+	ptr += strlen("log ");
+
+	len = req->len - (ptr - req->request.data);
+	printk("%.*s", len, ptr);
+	mconsole_reply(req, "", 0, 0);
+}
+
+/* This is a more convoluted version of mconsole_proc, which has some stability
+ * problems; however, we need it fixed, because it is expected that UML users
+ * mount HPPFS instead of procfs on /proc. And we want mconsole_proc to still
+ * show the real procfs content, not the ones from hppfs.*/
+#if 0
+void mconsole_proc(struct mc_request *req)
+{
+	struct nameidata nd;
+	struct file_system_type *proc;
+	struct super_block *super;
+	struct file *file;
+	int n, err;
+	char *ptr = req->request.data, *buf;
+
+	ptr += strlen("proc");
+	while(isspace(*ptr)) ptr++;
+
+	proc = get_fs_type("proc");
+	if(proc == NULL){
+		mconsole_reply(req, "procfs not registered", 1, 0);
+		goto out;
+	}
+
+	super = (*proc->get_sb)(proc, 0, NULL, NULL);
+	put_filesystem(proc);
+	if(super == NULL){
+		mconsole_reply(req, "Failed to get procfs superblock", 1, 0);
+		goto out;
+	}
+	up_write(&super->s_umount);
+
+	nd.dentry = super->s_root;
+	nd.mnt = NULL;
+	nd.flags = O_RDONLY + 1;
+	nd.last_type = LAST_ROOT;
+
+	/* START: it was experienced that the stability problems are closed
+	 * if commenting out these two calls + the below read cycle. To
+	 * make UML crash again, it was enough to readd either one.*/
+	err = link_path_walk(ptr, &nd);
+	if(err){
+		mconsole_reply(req, "Failed to look up file", 1, 0);
+		goto out_kill;
+	}
+
+	file = dentry_open(nd.dentry, nd.mnt, O_RDONLY);
+	if(IS_ERR(file)){
+		mconsole_reply(req, "Failed to open file", 1, 0);
+		goto out_kill;
+	}
+	/*END*/
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if(buf == NULL){
+		mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+		goto out_fput;
+	}
+
+	if((file->f_op != NULL) && (file->f_op->read != NULL)){
+		do {
+			n = (*file->f_op->read)(file, buf, PAGE_SIZE - 1,
+						&file->f_pos);
+			if(n >= 0){
+				buf[n] = '\0';
+				mconsole_reply(req, buf, 0, (n > 0));
+			}
+			else {
+				mconsole_reply(req, "Read of file failed",
+					       1, 0);
+				goto out_free;
+			}
+		} while(n > 0);
+	}
+	else mconsole_reply(req, "", 0, 0);
+
+ out_free:
+	kfree(buf);
+ out_fput:
+	fput(file);
+ out_kill:
+	deactivate_super(super);
+ out: ;
+}
+#endif
+
+void mconsole_proc(struct mc_request *req)
+{
+	char path[64];
+	char *buf;
+	int len;
+	int fd;
+	int first_chunk = 1;
+	char *ptr = req->request.data;
+
+	ptr += strlen("proc");
+	while(isspace(*ptr)) ptr++;
+	snprintf(path, sizeof(path), "/proc/%s", ptr);
+
+	fd = sys_open(path, 0, 0);
+	if (fd < 0) {
+		mconsole_reply(req, "Failed to open file", 1, 0);
+		printk("open %s: %d\n",path,fd);
+		goto out;
+	}
+
+	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if(buf == NULL){
+		mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+		goto out_close;
+	}
+
+	for (;;) {
+		len = sys_read(fd, buf, PAGE_SIZE-1);
+		if (len < 0) {
+			mconsole_reply(req, "Read of file failed", 1, 0);
+			goto out_free;
+		}
+		/*Begin the file content on his own line.*/
+		if (first_chunk) {
+			mconsole_reply(req, "\n", 0, 1);
+			first_chunk = 0;
+		}
+		if (len == PAGE_SIZE-1) {
+			buf[len] = '\0';
+			mconsole_reply(req, buf, 0, 1);
+		} else {
+			buf[len] = '\0';
+			mconsole_reply(req, buf, 0, 0);
+			break;
+		}
+	}
+
+ out_free:
+	kfree(buf);
+ out_close:
+	sys_close(fd);
+ out:
+	/* nothing */;
+}
+
+#define UML_MCONSOLE_HELPTEXT \
+"Commands: \n\
+    version - Get kernel version \n\
+    help - Print this message \n\
+    halt - Halt UML \n\
+    reboot - Reboot UML \n\
+    config <dev>=<config> - Add a new device to UML;  \n\
+	same syntax as command line \n\
+    config <dev> - Query the configuration of a device \n\
+    remove <dev> - Remove a device from UML \n\
+    sysrq <letter> - Performs the SysRq action controlled by the letter \n\
+    cad - invoke the Ctl-Alt-Del handler \n\
+    stop - pause the UML; it will do nothing until it receives a 'go' \n\
+    go - continue the UML after a 'stop' \n\
+    log <string> - make UML enter <string> into the kernel log\n\
+    proc <file> - returns the contents of the UML's /proc/<file>\n\
+"
+
+void mconsole_help(struct mc_request *req)
+{
+	mconsole_reply(req, UML_MCONSOLE_HELPTEXT, 0, 0);
+}
+
+void mconsole_halt(struct mc_request *req)
+{
+	mconsole_reply(req, "", 0, 0);
+	machine_halt();
+}
+
+void mconsole_reboot(struct mc_request *req)
+{
+	mconsole_reply(req, "", 0, 0);
+	machine_restart(NULL);
+}
+
+extern void ctrl_alt_del(void);
+
+void mconsole_cad(struct mc_request *req)
+{
+	mconsole_reply(req, "", 0, 0);
+	ctrl_alt_del();
+}
+
+void mconsole_go(struct mc_request *req)
+{
+	mconsole_reply(req, "Not stopped", 1, 0);
+}
+
+void mconsole_stop(struct mc_request *req)
+{
+	deactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+	os_set_fd_block(req->originating_fd, 1);
+	mconsole_reply(req, "", 0, 0);
+	while(mconsole_get_request(req->originating_fd, req)){
+		if(req->cmd->handler == mconsole_go) break;
+		(*req->cmd->handler)(req);
+	}
+	os_set_fd_block(req->originating_fd, 0);
+	reactivate_fd(req->originating_fd, MCONSOLE_IRQ);
+	mconsole_reply(req, "", 0, 0);
+}
+
+/* This list is populated by __initcall routines. */
+
+LIST_HEAD(mconsole_devices);
+
+void mconsole_register_dev(struct mc_device *new)
+{
+	list_add(&new->list, &mconsole_devices);
+}
+
+static struct mc_device *mconsole_find_dev(char *name)
+{
+	struct list_head *ele;
+	struct mc_device *dev;
+
+	list_for_each(ele, &mconsole_devices){
+		dev = list_entry(ele, struct mc_device, list);
+		if(!strncmp(name, dev->name, strlen(dev->name)))
+			return(dev);
+	}
+	return(NULL);
+}
+
+#define CONFIG_BUF_SIZE 64
+
+static void mconsole_get_config(int (*get_config)(char *, char *, int, 
+						  char **),
+				struct mc_request *req, char *name)
+{
+	char default_buf[CONFIG_BUF_SIZE], *error, *buf;
+	int n, size;
+
+	if(get_config == NULL){
+		mconsole_reply(req, "No get_config routine defined", 1, 0);
+		return;
+	}
+
+	error = NULL;
+	size = sizeof(default_buf)/sizeof(default_buf[0]);
+	buf = default_buf;
+
+	while(1){
+		n = (*get_config)(name, buf, size, &error);
+		if(error != NULL){
+			mconsole_reply(req, error, 1, 0);
+			goto out;
+		}
+
+		if(n <= size){
+			mconsole_reply(req, buf, 0, 0);
+			goto out;
+		}
+
+		if(buf != default_buf)
+			kfree(buf);
+
+		size = n;
+		buf = kmalloc(size, GFP_KERNEL);
+		if(buf == NULL){
+			mconsole_reply(req, "Failed to allocate buffer", 1, 0);
+			return;
+		}
+	}
+ out:
+	if(buf != default_buf)
+		kfree(buf);
+	
+}
+
+void mconsole_config(struct mc_request *req)
+{
+	struct mc_device *dev;
+	char *ptr = req->request.data, *name;
+	int err;
+
+	ptr += strlen("config");
+	while(isspace(*ptr)) ptr++;
+	dev = mconsole_find_dev(ptr);
+	if(dev == NULL){
+		mconsole_reply(req, "Bad configuration option", 1, 0);
+		return;
+	}
+
+	name = &ptr[strlen(dev->name)];
+	ptr = name;
+	while((*ptr != '=') && (*ptr != '\0'))
+		ptr++;
+
+	if(*ptr == '='){
+		err = (*dev->config)(name);
+		mconsole_reply(req, "", err, 0);
+	}
+	else mconsole_get_config(dev->get_config, req, name);
+}
+
+void mconsole_remove(struct mc_request *req)
+{
+	struct mc_device *dev;	
+	char *ptr = req->request.data;
+	int err;
+
+	ptr += strlen("remove");
+	while(isspace(*ptr)) ptr++;
+	dev = mconsole_find_dev(ptr);
+	if(dev == NULL){
+		mconsole_reply(req, "Bad remove option", 1, 0);
+		return;
+	}
+	err = (*dev->remove)(&ptr[strlen(dev->name)]);
+	mconsole_reply(req, "", err, 0);
+}
+
+#ifdef CONFIG_MAGIC_SYSRQ
+void mconsole_sysrq(struct mc_request *req)
+{
+	char *ptr = req->request.data;
+
+	ptr += strlen("sysrq");
+	while(isspace(*ptr)) ptr++;
+
+	mconsole_reply(req, "", 0, 0);
+	handle_sysrq(*ptr, &current->thread.regs, NULL);
+}
+#else
+void mconsole_sysrq(struct mc_request *req)
+{
+	mconsole_reply(req, "Sysrq not compiled in", 1, 0);
+}
+#endif
+
+/* Changed by mconsole_setup, which is __setup, and called before SMP is
+ * active.
+ */
+static char *notify_socket = NULL; 
+
+int mconsole_init(void)
+{
+	/* long to avoid size mismatch warnings from gcc */
+	long sock;
+	int err;
+	char file[256];
+
+	if(umid_file_name("mconsole", file, sizeof(file))) return(-1);
+	snprintf(mconsole_socket_name, sizeof(file), "%s", file);
+
+	sock = os_create_unix_socket(file, sizeof(file), 1);
+	if (sock < 0){
+		printk("Failed to initialize management console\n");
+		return(1);
+	}
+
+	register_reboot_notifier(&reboot_notifier);
+
+	err = um_request_irq(MCONSOLE_IRQ, sock, IRQ_READ, mconsole_interrupt,
+			     SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM,
+			     "mconsole", (void *)sock);
+	if (err){
+		printk("Failed to get IRQ for management console\n");
+		return(1);
+	}
+
+	if(notify_socket != NULL){
+		notify_socket = uml_strdup(notify_socket);
+		if(notify_socket != NULL)
+			mconsole_notify(notify_socket, MCONSOLE_SOCKET,
+					mconsole_socket_name, 
+					strlen(mconsole_socket_name) + 1);
+		else printk(KERN_ERR "mconsole_setup failed to strdup "
+			    "string\n");
+	}
+
+	printk("mconsole (version %d) initialized on %s\n", 
+	       MCONSOLE_VERSION, mconsole_socket_name);
+	return(0);
+}
+
+__initcall(mconsole_init);
+
+static int write_proc_mconsole(struct file *file, const char __user *buffer,
+			       unsigned long count, void *data)
+{
+	char *buf;
+
+	buf = kmalloc(count + 1, GFP_KERNEL);
+	if(buf == NULL) 
+		return(-ENOMEM);
+
+	if(copy_from_user(buf, buffer, count)){
+		count = -EFAULT;
+		goto out;
+	}
+
+	buf[count] = '\0';
+
+	mconsole_notify(notify_socket, MCONSOLE_USER_NOTIFY, buf, count);
+ out:
+	kfree(buf);
+	return(count);
+}
+
+static int create_proc_mconsole(void)
+{
+	struct proc_dir_entry *ent;
+
+	if(notify_socket == NULL) return(0);
+
+	ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL);
+	if(ent == NULL){
+		printk("create_proc_mconsole : create_proc_entry failed\n");
+		return(0);
+	}
+
+	ent->read_proc = NULL;
+	ent->write_proc = write_proc_mconsole;
+	return(0);
+}
+
+static DEFINE_SPINLOCK(notify_spinlock);
+
+void lock_notify(void)
+{
+	spin_lock(&notify_spinlock);
+}
+
+void unlock_notify(void)
+{
+	spin_unlock(&notify_spinlock);
+}
+
+__initcall(create_proc_mconsole);
+
+#define NOTIFY "=notify:"
+
+static int mconsole_setup(char *str)
+{
+	if(!strncmp(str, NOTIFY, strlen(NOTIFY))){
+		str += strlen(NOTIFY);
+		notify_socket = str;
+	}
+	else printk(KERN_ERR "mconsole_setup : Unknown option - '%s'\n", str);
+	return(1);
+}
+
+__setup("mconsole", mconsole_setup);
+
+__uml_help(mconsole_setup,
+"mconsole=notify:<socket>\n"
+"    Requests that the mconsole driver send a message to the named Unix\n"
+"    socket containing the name of the mconsole socket.  This also serves\n"
+"    to notify outside processes when UML has booted far enough to respond\n"
+"    to mconsole requests.\n\n"
+);
+
+static int notify_panic(struct notifier_block *self, unsigned long unused1,
+			void *ptr)
+{
+	char *message = ptr;
+
+	if(notify_socket == NULL) return(0);
+
+	mconsole_notify(notify_socket, MCONSOLE_PANIC, message, 
+			strlen(message) + 1);
+	return(0);
+}
+
+static struct notifier_block panic_exit_notifier = {
+	.notifier_call 		= notify_panic,
+	.next 			= NULL,
+	.priority 		= 1
+};
+
+static int add_notifier(void)
+{
+	notifier_chain_register(&panic_notifier_list, &panic_exit_notifier);
+	return(0);
+}
+
+__initcall(add_notifier);
+
+char *mconsole_notify_socket(void)
+{
+	return(notify_socket);
+}
+
+EXPORT_SYMBOL(mconsole_notify_socket);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
new file mode 100644
index 00000000000..fe5afb13252
--- /dev/null
+++ b/arch/um/drivers/mconsole_user.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
+ * Copyright (C) 2001 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <signal.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <sys/un.h>
+#include <unistd.h>
+#include "user.h"
+#include "mconsole.h"
+#include "umid.h"
+
+static struct mconsole_command commands[] = {
+	{ "version", mconsole_version, MCONSOLE_INTR },
+	{ "halt", mconsole_halt, MCONSOLE_PROC },
+	{ "reboot", mconsole_reboot, MCONSOLE_PROC },
+	{ "config", mconsole_config, MCONSOLE_PROC },
+	{ "remove", mconsole_remove, MCONSOLE_PROC },
+	{ "sysrq", mconsole_sysrq, MCONSOLE_INTR },
+	{ "help", mconsole_help, MCONSOLE_INTR },
+	{ "cad", mconsole_cad, MCONSOLE_INTR },
+	{ "stop", mconsole_stop, MCONSOLE_PROC },
+	{ "go", mconsole_go, MCONSOLE_INTR },
+	{ "log", mconsole_log, MCONSOLE_INTR },
+	{ "proc", mconsole_proc, MCONSOLE_PROC },
+};
+
+/* Initialized in mconsole_init, which is an initcall */
+char mconsole_socket_name[256];
+
+int mconsole_reply_v0(struct mc_request *req, char *reply)
+{
+        struct iovec iov;
+        struct msghdr msg;
+
+        iov.iov_base = reply;
+        iov.iov_len = strlen(reply);
+
+        msg.msg_name = &(req->origin);
+        msg.msg_namelen = req->originlen;
+        msg.msg_iov = &iov;
+        msg.msg_iovlen = 1;
+        msg.msg_control = NULL;
+        msg.msg_controllen = 0;
+        msg.msg_flags = 0;
+
+        return sendmsg(req->originating_fd, &msg, 0);
+}
+
+static struct mconsole_command *mconsole_parse(struct mc_request *req)
+{
+	struct mconsole_command *cmd;
+	int i;
+
+	for(i=0;i<sizeof(commands)/sizeof(commands[0]);i++){
+		cmd = &commands[i];
+		if(!strncmp(req->request.data, cmd->command, 
+			    strlen(cmd->command))){
+			return(cmd);
+		}
+	}
+	return(NULL);
+}
+
+#define MIN(a,b) ((a)<(b) ? (a):(b))
+
+#define STRINGX(x) #x
+#define STRING(x) STRINGX(x)
+
+int mconsole_get_request(int fd, struct mc_request *req)
+{
+	int len;
+
+	req->originlen = sizeof(req->origin);
+	req->len = recvfrom(fd, &req->request, sizeof(req->request), 0,
+			    (struct sockaddr *) req->origin, &req->originlen);
+	if (req->len < 0)
+		return 0;
+
+	req->originating_fd = fd;
+
+	if(req->request.magic != MCONSOLE_MAGIC){
+		/* Unversioned request */
+		len = MIN(sizeof(req->request.data) - 1, 
+			  strlen((char *) &req->request));
+		memmove(req->request.data, &req->request, len);
+		req->request.data[len] = '\0';
+
+		req->request.magic = MCONSOLE_MAGIC;
+		req->request.version = 0;
+		req->request.len = len;
+
+		mconsole_reply_v0(req, "ERR Version 0 mconsole clients are "
+				  "not supported by this driver");
+		return(0);
+	}
+
+	if(req->request.len >= MCONSOLE_MAX_DATA){
+		mconsole_reply(req, "Request too large", 1, 0);
+		return(0);
+	}
+	if(req->request.version != MCONSOLE_VERSION){
+		mconsole_reply(req, "This driver only supports version " 
+                               STRING(MCONSOLE_VERSION) " clients", 1, 0);
+	}
+	
+	req->request.data[req->request.len] = '\0';
+	req->cmd = mconsole_parse(req);
+	if(req->cmd == NULL){
+		mconsole_reply(req, "Unknown command", 1, 0);
+		return(0);
+	}
+
+	return(1);
+}
+
+int mconsole_reply(struct mc_request *req, char *str, int err, int more)
+{
+	struct mconsole_reply reply;
+	int total, len, n;
+
+	total = strlen(str);
+	do {
+		reply.err = err;
+
+		/* err can only be true on the first packet */
+		err = 0;
+
+		len = MIN(total, MCONSOLE_MAX_DATA - 1);
+
+		if(len == total) reply.more = more;
+		else reply.more = 1;
+
+		memcpy(reply.data, str, len);
+		reply.data[len] = '\0';
+		total -= len;
+		str += len;
+		reply.len = len + 1;
+
+		len = sizeof(reply) + reply.len - sizeof(reply.data);
+
+		n = sendto(req->originating_fd, &reply, len, 0,
+			   (struct sockaddr *) req->origin, req->originlen);
+
+		if(n < 0) return(-errno);
+	} while(total > 0);
+	return(0);
+}
+
+int mconsole_unlink_socket(void)
+{
+	unlink(mconsole_socket_name);
+	return 0;
+}
+
+static int notify_sock = -1;
+
+int mconsole_notify(char *sock_name, int type, const void *data, int len)
+{
+	struct sockaddr_un target;
+	struct mconsole_notify packet;
+	int n, err = 0;
+
+	lock_notify();
+	if(notify_sock < 0){
+		notify_sock = socket(PF_UNIX, SOCK_DGRAM, 0);
+		if(notify_sock < 0){
+			printk("mconsole_notify - socket failed, errno = %d\n",
+			       errno);
+			err = -errno;
+		}
+	}
+	unlock_notify();
+	
+	if(err)
+		return(err);
+
+	target.sun_family = AF_UNIX;
+	strcpy(target.sun_path, sock_name);
+
+	packet.magic = MCONSOLE_MAGIC;
+	packet.version = MCONSOLE_VERSION;
+	packet.type = type;
+	len = (len > sizeof(packet.data)) ? sizeof(packet.data) : len;
+	packet.len = len;
+	memcpy(packet.data, data, len);
+
+	err = 0;
+	len = sizeof(packet) + packet.len - sizeof(packet.data);
+	n = sendto(notify_sock, &packet, len, 0, (struct sockaddr *) &target, 
+		   sizeof(target));
+	if(n < 0){
+		printk("mconsole_notify - sendto failed, errno = %d\n", errno);
+		err = -errno;
+	}
+	return(err);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c
new file mode 100644
index 00000000000..a63231dffe0
--- /dev/null
+++ b/arch/um/drivers/mmapper_kern.c
@@ -0,0 +1,150 @@
+/*
+ * arch/um/drivers/mmapper_kern.c
+ *
+ * BRIEF MODULE DESCRIPTION
+ *
+ * Copyright (C) 2000 RidgeRun, Inc.
+ * Author: RidgeRun, Inc.
+ *         Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/kdev_t.h>
+#include <linux/time.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/module.h>
+#include <linux/mm.h> 
+#include <linux/slab.h>
+#include <linux/init.h> 
+#include <linux/smp_lock.h>
+#include <asm/uaccess.h>
+#include <asm/irq.h>
+#include <asm/pgtable.h>
+#include "mem_user.h"
+#include "user_util.h"
+ 
+/* These are set in mmapper_init, which is called at boot time */
+static unsigned long mmapper_size;
+static unsigned long p_buf = 0;
+static char *v_buf = NULL;
+
+static ssize_t
+mmapper_read(struct file *file, char *buf, size_t count, loff_t *ppos)
+{
+	if(*ppos > mmapper_size)
+		return -EINVAL;
+
+	if(count + *ppos > mmapper_size)
+		count = count + *ppos - mmapper_size;
+
+	if(count < 0)
+		return -EINVAL;
+ 
+	copy_to_user(buf,&v_buf[*ppos],count);
+	
+	return count;
+}
+
+static ssize_t
+mmapper_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
+{
+	if(*ppos > mmapper_size)
+		return -EINVAL;
+
+	if(count + *ppos > mmapper_size)
+		count = count + *ppos - mmapper_size;
+
+	if(count < 0)
+		return -EINVAL;
+
+	copy_from_user(&v_buf[*ppos],buf,count);
+	
+	return count;
+}
+
+static int 
+mmapper_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	 unsigned long arg)
+{
+	return(-ENOIOCTLCMD);
+}
+
+static int 
+mmapper_mmap(struct file *file, struct vm_area_struct * vma)
+{
+	int ret = -EINVAL;
+	int size;
+
+	lock_kernel();
+	if (vma->vm_pgoff != 0)
+		goto out;
+	
+	size = vma->vm_end - vma->vm_start;
+	if(size > mmapper_size) return(-EFAULT);
+
+	/* XXX A comment above remap_pfn_range says it should only be
+	 * called when the mm semaphore is held
+	 */
+	if (remap_pfn_range(vma, vma->vm_start, p_buf >> PAGE_SHIFT, size,
+			     vma->vm_page_prot))
+		goto out;
+	ret = 0;
+out:
+	unlock_kernel();
+	return ret;
+}
+
+static int
+mmapper_open(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static int 
+mmapper_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+
+static struct file_operations mmapper_fops = {
+	.owner		= THIS_MODULE,
+	.read		= mmapper_read,
+	.write		= mmapper_write,
+	.ioctl		= mmapper_ioctl,
+	.mmap		= mmapper_mmap,
+	.open		= mmapper_open,
+	.release	= mmapper_release,
+};
+
+static int __init mmapper_init(void)
+{
+	printk(KERN_INFO "Mapper v0.1\n");
+
+	v_buf = (char *) find_iomem("mmapper", &mmapper_size);
+	if(mmapper_size == 0){
+		printk(KERN_ERR "mmapper_init - find_iomem failed\n");
+		return(0);
+	}
+
+	p_buf = __pa(v_buf);
+
+	devfs_mk_cdev(MKDEV(30, 0), S_IFCHR|S_IRUGO|S_IWUGO, "mmapper");
+	return(0);
+}
+
+static void mmapper_exit(void)
+{
+}
+
+module_init(mmapper_init);
+module_exit(mmapper_exit);
+
+MODULE_AUTHOR("Greg Lonnon <glonnon@ridgerun.com>");
+MODULE_DESCRIPTION("DSPLinux simulator mmapper driver");
+/*
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/net_kern.c b/arch/um/drivers/net_kern.c
new file mode 100644
index 00000000000..4eeaf88c1e9
--- /dev/null
+++ b/arch/um/drivers/net_kern.c
@@ -0,0 +1,896 @@
+/*
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 by various other people who didn't put their name here.
+ * Licensed under the GPL.
+ */
+
+#include "linux/config.h"
+#include "linux/kernel.h"
+#include "linux/netdevice.h"
+#include "linux/rtnetlink.h"
+#include "linux/skbuff.h"
+#include "linux/socket.h"
+#include "linux/spinlock.h"
+#include "linux/module.h"
+#include "linux/init.h"
+#include "linux/etherdevice.h"
+#include "linux/list.h"
+#include "linux/inetdevice.h"
+#include "linux/ctype.h"
+#include "linux/bootmem.h"
+#include "linux/ethtool.h"
+#include "asm/uaccess.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "mconsole_kern.h"
+#include "init.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+
+#define DRIVER_NAME "uml-netdev"
+
+static DEFINE_SPINLOCK(opened_lock);
+LIST_HEAD(opened);
+
+static int uml_net_rx(struct net_device *dev)
+{
+	struct uml_net_private *lp = dev->priv;
+	int pkt_len;
+	struct sk_buff *skb;
+
+	/* If we can't allocate memory, try again next round. */
+	skb = dev_alloc_skb(dev->mtu);
+	if (skb == NULL) {
+		lp->stats.rx_dropped++;
+		return 0;
+	}
+
+	skb->dev = dev;
+	skb_put(skb, dev->mtu);
+	skb->mac.raw = skb->data;
+	pkt_len = (*lp->read)(lp->fd, &skb, lp);
+
+	if (pkt_len > 0) {
+		skb_trim(skb, pkt_len);
+		skb->protocol = (*lp->protocol)(skb);
+		netif_rx(skb);
+
+		lp->stats.rx_bytes += skb->len;
+		lp->stats.rx_packets++;
+		return pkt_len;
+	}
+
+	kfree_skb(skb);
+	return pkt_len;
+}
+
+irqreturn_t uml_net_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	struct net_device *dev = dev_id;
+	struct uml_net_private *lp = dev->priv;
+	int err;
+
+	if(!netif_running(dev))
+		return(IRQ_NONE);
+
+	spin_lock(&lp->lock);
+	while((err = uml_net_rx(dev)) > 0) ;
+	if(err < 0) {
+		printk(KERN_ERR 
+		       "Device '%s' read returned %d, shutting it down\n", 
+		       dev->name, err);
+		dev_close(dev);
+		goto out;
+	}
+	reactivate_fd(lp->fd, UM_ETH_IRQ);
+
+ out:
+	spin_unlock(&lp->lock);
+	return(IRQ_HANDLED);
+}
+
+static int uml_net_open(struct net_device *dev)
+{
+	struct uml_net_private *lp = dev->priv;
+	char addr[sizeof("255.255.255.255\0")];
+	int err;
+
+	spin_lock(&lp->lock);
+
+	if(lp->fd >= 0){
+		err = -ENXIO;
+		goto out;
+	}
+
+	if(!lp->have_mac){
+ 		dev_ip_addr(dev, addr, &lp->mac[2]);
+ 		set_ether_mac(dev, lp->mac);
+	}
+
+	lp->fd = (*lp->open)(&lp->user);
+	if(lp->fd < 0){
+		err = lp->fd;
+		goto out;
+	}
+
+	err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt,
+			     SA_INTERRUPT | SA_SHIRQ, dev->name, dev);
+	if(err != 0){
+		printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err);
+		if(lp->close != NULL) (*lp->close)(lp->fd, &lp->user);
+		lp->fd = -1;
+		err = -ENETUNREACH;
+	}
+
+	lp->tl.data = (unsigned long) &lp->user;
+	netif_start_queue(dev);
+
+	/* clear buffer - it can happen that the host side of the interface
+	 * is full when we get here.  In this case, new data is never queued,
+	 * SIGIOs never arrive, and the net never works.
+	 */
+	while((err = uml_net_rx(dev)) > 0) ;
+
+ out:
+	spin_unlock(&lp->lock);
+	return(err);
+}
+
+static int uml_net_close(struct net_device *dev)
+{
+	struct uml_net_private *lp = dev->priv;
+	
+	netif_stop_queue(dev);
+	spin_lock(&lp->lock);
+
+	free_irq_by_irq_and_dev(dev->irq, dev);
+	free_irq(dev->irq, dev);
+	if(lp->close != NULL)
+		(*lp->close)(lp->fd, &lp->user);
+	lp->fd = -1;
+
+	spin_unlock(&lp->lock);
+	return 0;
+}
+
+static int uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct uml_net_private *lp = dev->priv;
+	unsigned long flags;
+	int len;
+
+	netif_stop_queue(dev);
+
+	spin_lock_irqsave(&lp->lock, flags);
+
+	len = (*lp->write)(lp->fd, &skb, lp);
+
+	if(len == skb->len) {
+		lp->stats.tx_packets++;
+		lp->stats.tx_bytes += skb->len;
+		dev->trans_start = jiffies;
+		netif_start_queue(dev);
+
+		/* this is normally done in the interrupt when tx finishes */
+		netif_wake_queue(dev);
+	} 
+	else if(len == 0){
+		netif_start_queue(dev);
+		lp->stats.tx_dropped++;
+	}
+	else {
+		netif_start_queue(dev);
+		printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len);
+	}
+
+	spin_unlock_irqrestore(&lp->lock, flags);
+
+	dev_kfree_skb(skb);
+
+	return 0;
+}
+
+static struct net_device_stats *uml_net_get_stats(struct net_device *dev)
+{
+	struct uml_net_private *lp = dev->priv;
+	return &lp->stats;
+}
+
+static void uml_net_set_multicast_list(struct net_device *dev)
+{
+	if (dev->flags & IFF_PROMISC) return;
+	else if (dev->mc_count)	dev->flags |= IFF_ALLMULTI;
+	else dev->flags &= ~IFF_ALLMULTI;
+}
+
+static void uml_net_tx_timeout(struct net_device *dev)
+{
+	dev->trans_start = jiffies;
+	netif_wake_queue(dev);
+}
+
+static int uml_net_set_mac(struct net_device *dev, void *addr)
+{
+	struct uml_net_private *lp = dev->priv;
+	struct sockaddr *hwaddr = addr;
+
+	spin_lock(&lp->lock);
+	memcpy(dev->dev_addr, hwaddr->sa_data, ETH_ALEN);
+	spin_unlock(&lp->lock);
+
+	return(0);
+}
+
+static int uml_net_change_mtu(struct net_device *dev, int new_mtu)
+{
+	struct uml_net_private *lp = dev->priv;
+	int err = 0;
+
+	spin_lock(&lp->lock);
+
+	new_mtu = (*lp->set_mtu)(new_mtu, &lp->user);
+	if(new_mtu < 0){
+		err = new_mtu;
+		goto out;
+	}
+
+	dev->mtu = new_mtu;
+
+ out:
+	spin_unlock(&lp->lock);
+	return err;
+}
+
+static int uml_net_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+	static const struct ethtool_drvinfo info = {
+		.cmd     = ETHTOOL_GDRVINFO,
+		.driver  = DRIVER_NAME,
+		.version = "42",
+	};
+	void *useraddr;
+	u32 ethcmd;
+
+	switch (cmd) {
+	case SIOCETHTOOL:
+		useraddr = ifr->ifr_data;
+		if (copy_from_user(&ethcmd, useraddr, sizeof(ethcmd)))
+			return -EFAULT;
+		switch (ethcmd) {
+		case ETHTOOL_GDRVINFO:
+			if (copy_to_user(useraddr, &info, sizeof(info)))
+				return -EFAULT;
+			return 0;
+		default:
+			return -EOPNOTSUPP;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+void uml_net_user_timer_expire(unsigned long _conn)
+{
+#ifdef undef
+	struct connection *conn = (struct connection *)_conn;
+
+	dprintk(KERN_INFO "uml_net_user_timer_expire [%p]\n", conn);
+	do_connect(conn);
+#endif
+}
+
+static DEFINE_SPINLOCK(devices_lock);
+static struct list_head devices = LIST_HEAD_INIT(devices);
+
+static struct device_driver uml_net_driver = {
+	.name  = DRIVER_NAME,
+	.bus   = &platform_bus_type,
+};
+static int driver_registered;
+
+static int eth_configure(int n, void *init, char *mac,
+			 struct transport *transport)
+{
+	struct uml_net *device;
+	struct net_device *dev;
+	struct uml_net_private *lp;
+	int save, err, size;
+
+	size = transport->private_size + sizeof(struct uml_net_private) + 
+		sizeof(((struct uml_net_private *) 0)->user);
+
+	device = kmalloc(sizeof(*device), GFP_KERNEL);
+	if (device == NULL) {
+		printk(KERN_ERR "eth_configure failed to allocate uml_net\n");
+		return(1);
+	}
+
+	memset(device, 0, sizeof(*device));
+	INIT_LIST_HEAD(&device->list);
+	device->index = n;
+
+	spin_lock(&devices_lock);
+	list_add(&device->list, &devices);
+	spin_unlock(&devices_lock);
+
+	if (setup_etheraddr(mac, device->mac))
+		device->have_mac = 1;
+
+	printk(KERN_INFO "Netdevice %d ", n);
+	if (device->have_mac)
+		printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
+		       device->mac[0], device->mac[1],
+		       device->mac[2], device->mac[3],
+		       device->mac[4], device->mac[5]);
+	printk(": ");
+	dev = alloc_etherdev(size);
+	if (dev == NULL) {
+		printk(KERN_ERR "eth_configure: failed to allocate device\n");
+		return 1;
+	}
+
+	/* sysfs register */
+	if (!driver_registered) {
+		driver_register(&uml_net_driver);
+		driver_registered = 1;
+	}
+	device->pdev.id = n;
+	device->pdev.name = DRIVER_NAME;
+	platform_device_register(&device->pdev);
+	SET_NETDEV_DEV(dev,&device->pdev.dev);
+
+	/* If this name ends up conflicting with an existing registered
+	 * netdevice, that is OK, register_netdev{,ice}() will notice this
+	 * and fail.
+	 */
+	snprintf(dev->name, sizeof(dev->name), "eth%d", n);
+	device->dev = dev;
+
+	(*transport->kern->init)(dev, init);
+
+	dev->mtu = transport->user->max_packet;
+	dev->open = uml_net_open;
+	dev->hard_start_xmit = uml_net_start_xmit;
+	dev->stop = uml_net_close;
+	dev->get_stats = uml_net_get_stats;
+	dev->set_multicast_list = uml_net_set_multicast_list;
+	dev->tx_timeout = uml_net_tx_timeout;
+	dev->set_mac_address = uml_net_set_mac;
+	dev->change_mtu = uml_net_change_mtu;
+	dev->do_ioctl = uml_net_ioctl;
+	dev->watchdog_timeo = (HZ >> 1);
+	dev->irq = UM_ETH_IRQ;
+
+	rtnl_lock();
+	err = register_netdevice(dev);
+	rtnl_unlock();
+	if (err) {
+		device->dev = NULL;
+		/* XXX: should we call ->remove() here? */
+		free_netdev(dev);
+		return 1;
+	}
+	lp = dev->priv;
+
+	/* lp.user is the first four bytes of the transport data, which
+	 * has already been initialized.  This structure assignment will
+	 * overwrite that, so we make sure that .user gets overwritten with
+	 * what it already has.
+	 */
+	save = lp->user[0];
+	*lp = ((struct uml_net_private)
+		{ .list  		= LIST_HEAD_INIT(lp->list),
+		  .dev 			= dev,
+		  .fd 			= -1,
+		  .mac 			= { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0},
+		  .have_mac 		= device->have_mac,
+		  .protocol 		= transport->kern->protocol,
+		  .open 		= transport->user->open,
+		  .close 		= transport->user->close,
+		  .remove 		= transport->user->remove,
+		  .read 		= transport->kern->read,
+		  .write 		= transport->kern->write,
+		  .add_address 		= transport->user->add_address,
+		  .delete_address  	= transport->user->delete_address,
+		  .set_mtu 		= transport->user->set_mtu,
+		  .user  		= { save } });
+
+	init_timer(&lp->tl);
+	spin_lock_init(&lp->lock);
+	lp->tl.function = uml_net_user_timer_expire;
+	if (lp->have_mac)
+		memcpy(lp->mac, device->mac, sizeof(lp->mac));
+
+	if (transport->user->init) 
+		(*transport->user->init)(&lp->user, dev);
+
+	if (device->have_mac)
+		set_ether_mac(dev, device->mac);
+
+	spin_lock(&opened_lock);
+	list_add(&lp->list, &opened);
+	spin_unlock(&opened_lock);
+
+	return(0);
+}
+
+static struct uml_net *find_device(int n)
+{
+	struct uml_net *device;
+	struct list_head *ele;
+
+	spin_lock(&devices_lock);
+	list_for_each(ele, &devices){
+		device = list_entry(ele, struct uml_net, list);
+		if(device->index == n)
+			goto out;
+	}
+	device = NULL;
+ out:
+	spin_unlock(&devices_lock);
+	return(device);
+}
+
+static int eth_parse(char *str, int *index_out, char **str_out)
+{
+	char *end;
+	int n;
+
+	n = simple_strtoul(str, &end, 0);
+	if(end == str){
+		printk(KERN_ERR "eth_setup: Failed to parse '%s'\n", str);
+		return(1);
+	}
+	if(n < 0){
+		printk(KERN_ERR "eth_setup: device %d is negative\n", n);
+		return(1);
+	}
+	str = end;
+	if(*str != '='){
+		printk(KERN_ERR 
+		       "eth_setup: expected '=' after device number\n");
+		return(1);
+	}
+	str++;
+	if(find_device(n)){
+		printk(KERN_ERR "eth_setup: Device %d already configured\n",
+		       n);
+		return(1);
+	}
+	if(index_out) *index_out = n;
+	*str_out = str;
+	return(0);
+}
+
+struct eth_init {
+	struct list_head list;
+	char *init;
+	int index;
+};
+
+/* Filled in at boot time.  Will need locking if the transports become
+ * modular.
+ */
+struct list_head transports = LIST_HEAD_INIT(transports);
+
+/* Filled in during early boot */
+struct list_head eth_cmd_line = LIST_HEAD_INIT(eth_cmd_line);
+
+static int check_transport(struct transport *transport, char *eth, int n,
+			   void **init_out, char **mac_out)
+{
+	int len;
+
+	len = strlen(transport->name);
+	if(strncmp(eth, transport->name, len))
+		return(0);
+
+	eth += len;
+	if(*eth == ',')
+		eth++;
+	else if(*eth != '\0')
+		return(0);
+
+	*init_out = kmalloc(transport->setup_size, GFP_KERNEL);
+	if(*init_out == NULL)
+		return(1);
+
+	if(!transport->setup(eth, mac_out, *init_out)){
+		kfree(*init_out);
+		*init_out = NULL;
+	}
+	return(1);
+}
+
+void register_transport(struct transport *new)
+{
+	struct list_head *ele, *next;
+	struct eth_init *eth;
+	void *init;
+	char *mac = NULL;
+	int match;
+
+	list_add(&new->list, &transports);
+
+	list_for_each_safe(ele, next, &eth_cmd_line){
+		eth = list_entry(ele, struct eth_init, list);
+		match = check_transport(new, eth->init, eth->index, &init,
+					&mac);
+		if(!match)
+			continue;
+		else if(init != NULL){
+			eth_configure(eth->index, init, mac, new);
+			kfree(init);
+		}
+		list_del(&eth->list);
+	}
+}
+
+static int eth_setup_common(char *str, int index)
+{
+	struct list_head *ele;
+	struct transport *transport;
+	void *init;
+	char *mac = NULL;
+
+	list_for_each(ele, &transports){
+		transport = list_entry(ele, struct transport, list);
+	        if(!check_transport(transport, str, index, &init, &mac))
+			continue;
+		if(init != NULL){
+			eth_configure(index, init, mac, transport);
+			kfree(init);
+		}
+		return(1);
+	}
+	return(0);
+}
+
+static int eth_setup(char *str)
+{
+	struct eth_init *new;
+	int n, err;
+
+	err = eth_parse(str, &n, &str);
+	if(err) return(1);
+
+	new = alloc_bootmem(sizeof(new));
+	if (new == NULL){
+		printk("eth_init : alloc_bootmem failed\n");
+		return(1);
+	}
+
+	INIT_LIST_HEAD(&new->list);
+	new->index = n;
+	new->init = str;
+
+	list_add_tail(&new->list, &eth_cmd_line);
+	return(1);
+}
+
+__setup("eth", eth_setup);
+__uml_help(eth_setup,
+"eth[0-9]+=<transport>,<options>\n"
+"    Configure a network device.\n\n"
+);
+
+#if 0
+static int eth_init(void)
+{
+	struct list_head *ele, *next;
+	struct eth_init *eth;
+
+	list_for_each_safe(ele, next, &eth_cmd_line){
+		eth = list_entry(ele, struct eth_init, list);
+
+		if(eth_setup_common(eth->init, eth->index))
+			list_del(&eth->list);
+	}
+	
+	return(1);
+}
+__initcall(eth_init);
+#endif
+
+static int net_config(char *str)
+{
+	int n, err;
+
+	err = eth_parse(str, &n, &str);
+	if(err) return(err);
+
+	str = uml_strdup(str);
+	if(str == NULL){
+		printk(KERN_ERR "net_config failed to strdup string\n");
+		return(-1);
+	}
+	err = !eth_setup_common(str, n);
+	if(err) 
+		kfree(str);
+	return(err);
+}
+
+static int net_remove(char *str)
+{
+	struct uml_net *device;
+	struct net_device *dev;
+	struct uml_net_private *lp;
+	char *end;
+	int n;
+
+	n = simple_strtoul(str, &end, 0);
+	if((*end != '\0') || (end == str))
+		return(-1);
+
+	device = find_device(n);
+	if(device == NULL)
+		return(0);
+
+	dev = device->dev;
+	lp = dev->priv;
+	if(lp->fd > 0) return(-1);
+	if(lp->remove != NULL) (*lp->remove)(&lp->user);
+	unregister_netdev(dev);
+	platform_device_unregister(&device->pdev);
+
+	list_del(&device->list);
+	kfree(device);
+	free_netdev(dev);
+	return(0);
+}
+
+static struct mc_device net_mc = {
+	.name		= "eth",
+	.config		= net_config,
+	.get_config	= NULL,
+	.remove		= net_remove,
+};
+
+static int uml_inetaddr_event(struct notifier_block *this, unsigned long event,
+			      void *ptr)
+{
+	struct in_ifaddr *ifa = ptr;
+	u32 addr = ifa->ifa_address;
+	u32 netmask = ifa->ifa_mask;
+	struct net_device *dev = ifa->ifa_dev->dev;
+	struct uml_net_private *lp;
+	void (*proc)(unsigned char *, unsigned char *, void *);
+	unsigned char addr_buf[4], netmask_buf[4];
+
+	if(dev->open != uml_net_open) return(NOTIFY_DONE);
+
+	lp = dev->priv;
+
+	proc = NULL;
+	switch (event){
+	case NETDEV_UP:
+		proc = lp->add_address;
+		break;
+	case NETDEV_DOWN:
+		proc = lp->delete_address;
+		break;
+	}
+	if(proc != NULL){
+		addr_buf[0] = addr & 0xff;
+		addr_buf[1] = (addr >> 8) & 0xff;
+		addr_buf[2] = (addr >> 16) & 0xff;
+		addr_buf[3] = addr >> 24;
+		netmask_buf[0] = netmask & 0xff;
+		netmask_buf[1] = (netmask >> 8) & 0xff;
+		netmask_buf[2] = (netmask >> 16) & 0xff;
+		netmask_buf[3] = netmask >> 24;
+		(*proc)(addr_buf, netmask_buf, &lp->user);
+	}
+	return(NOTIFY_DONE);
+}
+
+struct notifier_block uml_inetaddr_notifier = {
+	.notifier_call		= uml_inetaddr_event,
+};
+
+static int uml_net_init(void)
+{
+	struct list_head *ele;
+	struct uml_net_private *lp;	
+	struct in_device *ip;
+	struct in_ifaddr *in;
+
+	mconsole_register_dev(&net_mc);
+	register_inetaddr_notifier(&uml_inetaddr_notifier);
+
+	/* Devices may have been opened already, so the uml_inetaddr_notifier
+	 * didn't get a chance to run for them.  This fakes it so that
+	 * addresses which have already been set up get handled properly.
+	 */
+	list_for_each(ele, &opened){
+		lp = list_entry(ele, struct uml_net_private, list);
+		ip = lp->dev->ip_ptr;
+		if(ip == NULL) continue;
+		in = ip->ifa_list;
+		while(in != NULL){
+			uml_inetaddr_event(NULL, NETDEV_UP, in);
+			in = in->ifa_next;
+		}
+	}	
+
+	return(0);
+}
+
+__initcall(uml_net_init);
+
+static void close_devices(void)
+{
+	struct list_head *ele;
+	struct uml_net_private *lp;
+
+	list_for_each(ele, &opened){
+		lp = list_entry(ele, struct uml_net_private, list);
+		if((lp->close != NULL) && (lp->fd >= 0))
+			(*lp->close)(lp->fd, &lp->user);
+		if(lp->remove != NULL) (*lp->remove)(&lp->user);
+	}
+}
+
+__uml_exitcall(close_devices);
+
+int setup_etheraddr(char *str, unsigned char *addr)
+{
+	char *end;
+	int i;
+
+	if(str == NULL)
+		return(0);
+	for(i=0;i<6;i++){
+		addr[i] = simple_strtoul(str, &end, 16);
+		if((end == str) ||
+		   ((*end != ':') && (*end != ',') && (*end != '\0'))){
+			printk(KERN_ERR 
+			       "setup_etheraddr: failed to parse '%s' "
+			       "as an ethernet address\n", str);
+			return(0);
+		}
+		str = end + 1;
+	}
+	if(addr[0] & 1){
+		printk(KERN_ERR 
+		       "Attempt to assign a broadcast ethernet address to a "
+		       "device disallowed\n");
+		return(0);
+	}
+	return(1);
+}
+
+void dev_ip_addr(void *d, char *buf, char *bin_buf)
+{
+	struct net_device *dev = d;
+	struct in_device *ip = dev->ip_ptr;
+	struct in_ifaddr *in;
+	u32 addr;
+
+	if((ip == NULL) || ((in = ip->ifa_list) == NULL)){
+		printk(KERN_WARNING "dev_ip_addr - device not assigned an "
+		       "IP address\n");
+		return;
+	}
+	addr = in->ifa_address;
+	sprintf(buf, "%d.%d.%d.%d", addr & 0xff, (addr >> 8) & 0xff, 
+		(addr >> 16) & 0xff, addr >> 24);
+	if(bin_buf){
+		bin_buf[0] = addr & 0xff;
+		bin_buf[1] = (addr >> 8) & 0xff;
+		bin_buf[2] = (addr >> 16) & 0xff;
+		bin_buf[3] = addr >> 24;
+	}
+}
+
+void set_ether_mac(void *d, unsigned char *addr)
+{
+	struct net_device *dev = d;
+
+	memcpy(dev->dev_addr, addr, ETH_ALEN);	
+}
+
+struct sk_buff *ether_adjust_skb(struct sk_buff *skb, int extra)
+{
+	if((skb != NULL) && (skb_tailroom(skb) < extra)){
+	  	struct sk_buff *skb2;
+
+		skb2 = skb_copy_expand(skb, 0, extra, GFP_ATOMIC);
+		dev_kfree_skb(skb);
+		skb = skb2;
+	}
+	if(skb != NULL) skb_put(skb, extra);
+	return(skb);
+}
+
+void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, 
+					void *), 
+		    void *arg)
+{
+	struct net_device *dev = d;
+	struct in_device *ip = dev->ip_ptr;
+	struct in_ifaddr *in;
+	unsigned char address[4], netmask[4];
+
+	if(ip == NULL) return;
+	in = ip->ifa_list;
+	while(in != NULL){
+		address[0] = in->ifa_address & 0xff;
+		address[1] = (in->ifa_address >> 8) & 0xff;
+		address[2] = (in->ifa_address >> 16) & 0xff;
+		address[3] = in->ifa_address >> 24;
+		netmask[0] = in->ifa_mask & 0xff;
+		netmask[1] = (in->ifa_mask >> 8) & 0xff;
+		netmask[2] = (in->ifa_mask >> 16) & 0xff;
+		netmask[3] = in->ifa_mask >> 24;
+		(*cb)(address, netmask, arg);
+		in = in->ifa_next;
+	}
+}
+
+int dev_netmask(void *d, void *m)
+{
+	struct net_device *dev = d;
+	struct in_device *ip = dev->ip_ptr;
+	struct in_ifaddr *in;
+	__u32 *mask_out = m;
+
+	if(ip == NULL) 
+		return(1);
+
+	in = ip->ifa_list;
+	if(in == NULL) 
+		return(1);
+
+	*mask_out = in->ifa_mask;
+	return(0);
+}
+
+void *get_output_buffer(int *len_out)
+{
+	void *ret;
+
+	ret = (void *) __get_free_pages(GFP_KERNEL, 0);
+	if(ret) *len_out = PAGE_SIZE;
+	else *len_out = 0;
+	return(ret);
+}
+
+void free_output_buffer(void *buffer)
+{
+	free_pages((unsigned long) buffer, 0);
+}
+
+int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, 
+		     char **gate_addr)
+{
+	char *remain;
+
+	remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL);
+	if(remain != NULL){
+		printk("tap_setup_common - Extra garbage on specification : "
+		       "'%s'\n", remain);
+		return(1);
+	}
+
+	return(0);
+}
+
+unsigned short eth_protocol(struct sk_buff *skb)
+{
+	return(eth_type_trans(skb, skb->dev));
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/net_user.c b/arch/um/drivers/net_user.c
new file mode 100644
index 00000000000..47229fe4a81
--- /dev/null
+++ b/arch/um/drivers/net_user.c
@@ -0,0 +1,255 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include "user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "net_user.h"
+#include "helper.h"
+#include "os.h"
+
+int tap_open_common(void *dev, char *gate_addr)
+{
+	int tap_addr[4];
+
+	if(gate_addr == NULL) return(0);
+	if(sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], 
+		  &tap_addr[1], &tap_addr[2], &tap_addr[3]) != 4){
+		printk("Invalid tap IP address - '%s'\n", gate_addr);
+		return(-EINVAL);
+	}
+	return(0);
+}
+
+void tap_check_ips(char *gate_addr, char *eth_addr)
+{
+	int tap_addr[4];
+
+	if((gate_addr != NULL) && 
+	   (sscanf(gate_addr, "%d.%d.%d.%d", &tap_addr[0], 
+		   &tap_addr[1], &tap_addr[2], &tap_addr[3]) == 4) &&
+	   (eth_addr[0] == tap_addr[0]) && 
+	   (eth_addr[1] == tap_addr[1]) && 
+	   (eth_addr[2] == tap_addr[2]) && 
+	   (eth_addr[3] == tap_addr[3])){
+		printk("The tap IP address and the UML eth IP address"
+		       " must be different\n");
+	}
+}
+
+void read_output(int fd, char *output, int len)
+{
+	int remain, n, actual;
+	char c;
+
+	if(output == NULL){
+		output = &c;
+		len = sizeof(c);
+	}
+		
+	*output = '\0';
+	n = os_read_file(fd, &remain, sizeof(remain));
+	if(n != sizeof(remain)){
+		printk("read_output - read of length failed, err = %d\n", -n);
+		return;
+	}
+
+	while(remain != 0){
+		n = (remain < len) ? remain : len;
+		actual = os_read_file(fd, output, n);
+		if(actual != n){
+			printk("read_output - read of data failed, "
+			       "err = %d\n", -actual);
+			return;
+		}
+		remain -= actual;
+	}
+	return;
+}
+
+int net_read(int fd, void *buf, int len)
+{
+	int n;
+
+	n = os_read_file(fd,  buf,  len);
+
+	if(n == -EAGAIN)
+		return(0);
+	else if(n == 0)
+		return(-ENOTCONN);
+	return(n);
+}
+
+int net_recvfrom(int fd, void *buf, int len)
+{
+	int n;
+
+	while(((n = recvfrom(fd,  buf,  len, 0, NULL, NULL)) < 0) && 
+	      (errno == EINTR)) ;
+
+	if(n < 0){
+		if(errno == EAGAIN) return(0);
+		return(-errno);
+	}
+	else if(n == 0) return(-ENOTCONN);
+	return(n);
+}
+
+int net_write(int fd, void *buf, int len)
+{
+	int n;
+
+	n = os_write_file(fd, buf, len);
+
+	if(n == -EAGAIN)
+		return(0);
+	else if(n == 0)
+		return(-ENOTCONN);
+	return(n);
+}
+
+int net_send(int fd, void *buf, int len)
+{
+	int n;
+
+	while(((n = send(fd, buf, len, 0)) < 0) && (errno == EINTR)) ;
+	if(n < 0){
+		if(errno == EAGAIN) return(0);
+		return(-errno);
+	}
+	else if(n == 0) return(-ENOTCONN);
+	return(n);	
+}
+
+int net_sendto(int fd, void *buf, int len, void *to, int sock_len)
+{
+	int n;
+
+	while(((n = sendto(fd, buf, len, 0, (struct sockaddr *) to,
+			   sock_len)) < 0) && (errno == EINTR)) ;
+	if(n < 0){
+		if(errno == EAGAIN) return(0);
+		return(-errno);
+	}
+	else if(n == 0) return(-ENOTCONN);
+	return(n);	
+}
+
+struct change_pre_exec_data {
+	int close_me;
+	int stdout;
+};
+
+static void change_pre_exec(void *arg)
+{
+	struct change_pre_exec_data *data = arg;
+
+	os_close_file(data->close_me);
+	dup2(data->stdout, 1);
+}
+
+static int change_tramp(char **argv, char *output, int output_len)
+{
+	int pid, fds[2], err;
+	struct change_pre_exec_data pe_data;
+
+	err = os_pipe(fds, 1, 0);
+	if(err < 0){
+		printk("change_tramp - pipe failed, err = %d\n", -err);
+		return(err);
+	}
+	pe_data.close_me = fds[0];
+	pe_data.stdout = fds[1];
+	pid = run_helper(change_pre_exec, &pe_data, argv, NULL);
+
+	read_output(fds[0], output, output_len);
+	os_close_file(fds[0]);
+	os_close_file(fds[1]);
+
+	if (pid > 0)
+		CATCH_EINTR(err = waitpid(pid, NULL, 0));
+	return(pid);
+}
+
+static void change(char *dev, char *what, unsigned char *addr,
+		   unsigned char *netmask)
+{
+	char addr_buf[sizeof("255.255.255.255\0")];
+	char netmask_buf[sizeof("255.255.255.255\0")];
+	char version[sizeof("nnnnn\0")];
+	char *argv[] = { "uml_net", version, what, dev, addr_buf, 
+			 netmask_buf, NULL };
+	char *output;
+	int output_len, pid;
+
+	sprintf(version, "%d", UML_NET_VERSION);
+	sprintf(addr_buf, "%d.%d.%d.%d", addr[0], addr[1], addr[2], addr[3]);
+	sprintf(netmask_buf, "%d.%d.%d.%d", netmask[0], netmask[1], 
+		netmask[2], netmask[3]);
+
+	output_len = page_size();
+	output = um_kmalloc(output_len);
+	if(output == NULL)
+		printk("change : failed to allocate output buffer\n");
+
+	pid = change_tramp(argv, output, output_len);
+	if(pid < 0) return;
+
+	if(output != NULL){
+		printk("%s", output);
+		kfree(output);
+	}
+}
+
+void open_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+	change(arg, "add", addr, netmask);
+}
+
+void close_addr(unsigned char *addr, unsigned char *netmask, void *arg)
+{
+	change(arg, "del", addr, netmask);
+}
+
+char *split_if_spec(char *str, ...)
+{
+	char **arg, *end;
+	va_list ap;
+
+	va_start(ap, str);
+	while((arg = va_arg(ap, char **)) != NULL){
+		if(*str == '\0')
+			return(NULL);
+		end = strchr(str, ',');
+		if(end != str)
+			*arg = str;
+		if(end == NULL)
+			return(NULL);
+		*end++ = '\0';
+		str = end;
+	}
+	va_end(ap);
+	return(str);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/null.c b/arch/um/drivers/null.c
new file mode 100644
index 00000000000..14cc5f78398
--- /dev/null
+++ b/arch/um/drivers/null.c
@@ -0,0 +1,56 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <errno.h>
+#include "chan_user.h"
+#include "os.h"
+
+static int null_chan;
+
+static void *null_init(char *str, int device, struct chan_opts *opts)
+{
+	return(&null_chan);
+}
+
+static int null_open(int input, int output, int primary, void *d,
+		     char **dev_out)
+{
+	*dev_out = NULL;
+	return(os_open_file(DEV_NULL, of_rdwr(OPENFLAGS()), 0));
+}
+
+static int null_read(int fd, char *c_out, void *unused)
+{
+	return(-ENODEV);
+}
+
+static void null_free(void *data)
+{
+}
+
+struct chan_ops null_ops = {
+	.type		= "null",
+	.init		= null_init,
+	.open		= null_open,
+	.close		= generic_close,
+	.read		= null_read,
+	.write		= generic_write,
+	.console_write	= generic_console_write,
+	.window_size	= generic_window_size,
+	.free		= null_free,
+	.winch		= 0,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/pcap_kern.c b/arch/um/drivers/pcap_kern.c
new file mode 100644
index 00000000000..07c80f2156e
--- /dev/null
+++ b/arch/um/drivers/pcap_kern.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
+ * Licensed under the GPL.
+ */
+
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "pcap_user.h"
+
+struct pcap_init {
+	char *host_if;
+	int promisc;
+	int optimize;
+	char *filter;
+};
+
+void pcap_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct pcap_data *ppri;
+	struct pcap_init *init = data;
+
+	pri = dev->priv;
+	ppri = (struct pcap_data *) pri->user;
+	ppri->host_if = init->host_if;
+	ppri->promisc = init->promisc;
+	ppri->optimize = init->optimize;
+	ppri->filter = init->filter;
+}
+
+static int pcap_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
+	if(*skb == NULL) return(-ENOMEM);
+	return(pcap_user_read(fd, (*skb)->mac.raw, 
+			      (*skb)->dev->mtu + ETH_HEADER_OTHER,
+			      (struct pcap_data *) &lp->user));
+}
+
+static int pcap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+	return(-EPERM);
+}
+
+static struct net_kern_info pcap_kern_info = {
+	.init			= pcap_init,
+	.protocol		= eth_protocol,
+	.read			= pcap_read,
+	.write			= pcap_write,
+};
+
+int pcap_setup(char *str, char **mac_out, void *data)
+{
+	struct pcap_init *init = data;
+	char *remain, *host_if = NULL, *options[2] = { NULL, NULL };
+	int i;
+
+	*init = ((struct pcap_init)
+		{ .host_if 	= "eth0",
+		  .promisc 	= 1,
+		  .optimize 	= 0,
+		  .filter 	= NULL });
+
+	remain = split_if_spec(str, &host_if, &init->filter, 
+			       &options[0], &options[1], NULL);
+	if(remain != NULL){
+		printk(KERN_ERR "pcap_setup - Extra garbage on "
+		       "specification : '%s'\n", remain);
+		return(0);
+	}
+
+	if(host_if != NULL)
+		init->host_if = host_if;
+
+	for(i = 0; i < sizeof(options)/sizeof(options[0]); i++){
+		if(options[i] == NULL)
+			continue;
+		if(!strcmp(options[i], "promisc"))
+			init->promisc = 1;
+		else if(!strcmp(options[i], "nopromisc"))
+			init->promisc = 0;
+		else if(!strcmp(options[i], "optimize"))
+			init->optimize = 1;
+		else if(!strcmp(options[i], "nooptimize"))
+			init->optimize = 0;
+		else printk("pcap_setup : bad option - '%s'\n", options[i]);
+	}
+
+	return(1);
+}
+
+static struct transport pcap_transport = {
+	.list 		= LIST_HEAD_INIT(pcap_transport.list),
+	.name 		= "pcap",
+	.setup  	= pcap_setup,
+	.user 		= &pcap_user_info,
+	.kern 		= &pcap_kern_info,
+	.private_size 	= sizeof(struct pcap_data),
+	.setup_size 	= sizeof(struct pcap_init),
+};
+
+static int register_pcap(void)
+{
+	register_transport(&pcap_transport);
+	return(1);
+}
+
+__initcall(register_pcap);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/pcap_user.c b/arch/um/drivers/pcap_user.c
new file mode 100644
index 00000000000..edfcb29273e
--- /dev/null
+++ b/arch/um/drivers/pcap_user.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (C) 2002 Jeff Dike <jdike@karaya.com>
+ * Licensed under the GPL.
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <pcap.h>
+#include <asm/types.h>
+#include "net_user.h"
+#include "pcap_user.h"
+#include "user.h"
+
+#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
+
+#define PCAP_FD(p) (*(int *)(p))
+
+static void pcap_user_init(void *data, void *dev)
+{
+	struct pcap_data *pri = data;
+	pcap_t *p;
+	char errors[PCAP_ERRBUF_SIZE];
+
+	p = pcap_open_live(pri->host_if, MAX_PACKET, pri->promisc, 0, errors);
+	if(p == NULL){
+		printk("pcap_user_init : pcap_open_live failed - '%s'\n", 
+		       errors);
+		return;
+	}
+
+	pri->dev = dev;
+	pri->pcap = p;
+}
+
+static int pcap_open(void *data)
+{
+	struct pcap_data *pri = data;
+	__u32 netmask;
+	int err;
+
+	if(pri->pcap == NULL)
+		return(-ENODEV);
+
+	if(pri->filter != NULL){
+		err = dev_netmask(pri->dev, &netmask);
+		if(err < 0){
+			printk("pcap_open : dev_netmask failed\n");
+			return(-EIO);
+		}
+
+		pri->compiled = um_kmalloc(sizeof(struct bpf_program));
+		if(pri->compiled == NULL){
+			printk("pcap_open : kmalloc failed\n");
+			return(-ENOMEM);
+		}
+		
+		err = pcap_compile(pri->pcap, 
+				   (struct bpf_program *) pri->compiled, 
+				   pri->filter, pri->optimize, netmask);
+		if(err < 0){
+			printk("pcap_open : pcap_compile failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+
+		err = pcap_setfilter(pri->pcap, pri->compiled);
+		if(err < 0){
+			printk("pcap_open : pcap_setfilter failed - '%s'\n", 
+			       pcap_geterr(pri->pcap));
+			return(-EIO);
+		}
+	}
+	
+	return(PCAP_FD(pri->pcap));
+}
+
+static void pcap_remove(void *data)
+{
+	struct pcap_data *pri = data;
+
+	if(pri->compiled != NULL)
+		pcap_freecode(pri->compiled);
+
+	pcap_close(pri->pcap);
+}
+
+struct pcap_handler_data {
+	char *buffer;
+	int len;
+};
+
+static void handler(u_char *data, const struct pcap_pkthdr *header, 
+		    const u_char *packet)
+{
+	int len;
+
+	struct pcap_handler_data *hdata = (struct pcap_handler_data *) data;
+
+	len = hdata->len < header->caplen ? hdata->len : header->caplen;
+	memcpy(hdata->buffer, packet, len);
+	hdata->len = len;
+}
+
+int pcap_user_read(int fd, void *buffer, int len, struct pcap_data *pri)
+{
+	struct pcap_handler_data hdata = ((struct pcap_handler_data)
+		                          { .buffer  	= buffer,
+					    .len 	= len });
+	int n;
+
+	n = pcap_dispatch(pri->pcap, 1, handler, (u_char *) &hdata);
+	if(n < 0){
+		printk("pcap_dispatch failed - %s\n", pcap_geterr(pri->pcap));
+		return(-EIO);
+	}
+	else if(n == 0) 
+		return(0);
+	return(hdata.len);
+}
+
+struct net_user_info pcap_user_info = {
+	.init		= pcap_user_init,
+	.open		= pcap_open,
+	.close	 	= NULL,
+	.remove	 	= pcap_remove,
+	.set_mtu	= NULL,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= MAX_PACKET - ETH_HEADER_OTHER
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/pcap_user.h b/arch/um/drivers/pcap_user.h
new file mode 100644
index 00000000000..58f9f6a1420
--- /dev/null
+++ b/arch/um/drivers/pcap_user.h
@@ -0,0 +1,31 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "net_user.h"
+
+struct pcap_data {
+	char *host_if;
+	int promisc;
+	int optimize;
+	char *filter;
+	void *compiled;
+	void *pcap;
+	void *dev;
+};
+
+extern struct net_user_info pcap_user_info;
+
+extern int pcap_user_read(int fd, void *buf, int len, struct pcap_data *pri);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/port.h b/arch/um/drivers/port.h
new file mode 100644
index 00000000000..9117609a575
--- /dev/null
+++ b/arch/um/drivers/port.h
@@ -0,0 +1,30 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __PORT_H__
+#define __PORT_H__
+
+extern void *port_data(int port);
+extern int port_wait(void *data);
+extern void port_kern_close(void *d);
+extern int port_connection(int fd, int *socket_out, int *pid_out);
+extern int port_listen_fd(int port);
+extern void port_read(int fd, void *data);
+extern void port_kern_free(void *d);
+extern int port_rcv_fd(int fd);
+extern void port_remove_dev(void *d);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/port_kern.c b/arch/um/drivers/port_kern.c
new file mode 100644
index 00000000000..b5ee07472f7
--- /dev/null
+++ b/arch/um/drivers/port_kern.c
@@ -0,0 +1,309 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/list.h"
+#include "linux/sched.h"
+#include "linux/slab.h"
+#include "linux/interrupt.h"
+#include "linux/irq.h"
+#include "linux/spinlock.h"
+#include "linux/errno.h"
+#include "asm/atomic.h"
+#include "asm/semaphore.h"
+#include "asm/errno.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+#include "port.h"
+#include "init.h"
+#include "os.h"
+
+struct port_list {
+	struct list_head list;
+	atomic_t wait_count;
+	int has_connection;
+	struct completion done;
+	int port;
+	int fd;
+	spinlock_t lock;
+	struct list_head pending;
+	struct list_head connections;
+};
+
+struct port_dev {
+	struct port_list *port;
+	int helper_pid;
+	int telnetd_pid;
+};
+
+struct connection {
+	struct list_head list;
+	int fd;
+	int helper_pid;
+	int socket[2];
+	int telnetd_pid;
+	struct port_list *port;
+};
+
+static irqreturn_t pipe_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+	struct connection *conn = data;
+	int fd;
+
+	fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
+	if(fd < 0){
+		if(fd == -EAGAIN)
+			return(IRQ_NONE);
+
+		printk(KERN_ERR "pipe_interrupt : os_rcv_fd returned %d\n", 
+		       -fd);
+		os_close_file(conn->fd);
+	}
+
+	list_del(&conn->list);
+
+	conn->fd = fd;
+	list_add(&conn->list, &conn->port->connections);
+
+	complete(&conn->port->done);
+	return(IRQ_HANDLED);
+}
+
+#define NO_WAITER_MSG \
+    "****\n" \
+    "There are currently no UML consoles waiting for port connections.\n" \
+    "Either disconnect from one to make it available or activate some more\n" \
+    "by enabling more consoles in the UML /etc/inittab.\n" \
+    "****\n"
+
+static int port_accept(struct port_list *port)
+{
+	struct connection *conn;
+	int fd, socket[2], pid, ret = 0;
+
+	fd = port_connection(port->fd, socket, &pid);
+	if(fd < 0){
+		if(fd != -EAGAIN)
+			printk(KERN_ERR "port_accept : port_connection "
+			       "returned %d\n", -fd);
+		goto out;
+	}
+
+	conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
+	if(conn == NULL){
+		printk(KERN_ERR "port_accept : failed to allocate "
+		       "connection\n");
+		goto out_close;
+	}
+	*conn = ((struct connection) 
+		{ .list 	= LIST_HEAD_INIT(conn->list),
+		  .fd 		= fd,
+		  .socket  	= { socket[0], socket[1] },
+		  .telnetd_pid 	= pid,
+		  .port 	= port });
+
+	if(um_request_irq(TELNETD_IRQ, socket[0], IRQ_READ, pipe_interrupt, 
+			  SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+			  "telnetd", conn)){
+		printk(KERN_ERR "port_accept : failed to get IRQ for "
+		       "telnetd\n");
+		goto out_free;
+	}
+
+	if(atomic_read(&port->wait_count) == 0){
+		os_write_file(fd, NO_WAITER_MSG, sizeof(NO_WAITER_MSG));
+		printk("No one waiting for port\n");
+	}
+	list_add(&conn->list, &port->pending);
+	return(1);
+
+ out_free:
+	kfree(conn);
+ out_close:
+	os_close_file(fd);
+	if(pid != -1) 
+		os_kill_process(pid, 1);
+ out:
+	return(ret);
+} 
+
+DECLARE_MUTEX(ports_sem);
+struct list_head ports = LIST_HEAD_INIT(ports);
+
+void port_work_proc(void *unused)
+{
+	struct port_list *port;
+	struct list_head *ele;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	list_for_each(ele, &ports){
+		port = list_entry(ele, struct port_list, list);
+		if(!port->has_connection)
+			continue;
+		reactivate_fd(port->fd, ACCEPT_IRQ);
+		while(port_accept(port)) ;
+		port->has_connection = 0;
+	}
+	local_irq_restore(flags);
+}
+
+DECLARE_WORK(port_work, port_work_proc, NULL);
+
+static irqreturn_t port_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+	struct port_list *port = data;
+
+	port->has_connection = 1;
+	schedule_work(&port_work);
+	return(IRQ_HANDLED);
+} 
+
+void *port_data(int port_num)
+{
+	struct list_head *ele;
+	struct port_list *port;
+	struct port_dev *dev = NULL;
+	int fd;
+
+	down(&ports_sem);
+	list_for_each(ele, &ports){
+		port = list_entry(ele, struct port_list, list);
+		if(port->port == port_num) goto found;
+	}
+	port = kmalloc(sizeof(struct port_list), GFP_KERNEL);
+	if(port == NULL){
+		printk(KERN_ERR "Allocation of port list failed\n");
+		goto out;
+	}
+
+	fd = port_listen_fd(port_num);
+	if(fd < 0){
+		printk(KERN_ERR "binding to port %d failed, errno = %d\n",
+		       port_num, -fd);
+		goto out_free;
+	}
+	if(um_request_irq(ACCEPT_IRQ, fd, IRQ_READ, port_interrupt, 
+			  SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, "port",
+			  port)){
+		printk(KERN_ERR "Failed to get IRQ for port %d\n", port_num);
+		goto out_close;
+	}
+
+	*port = ((struct port_list) 
+		{ .list 	 	= LIST_HEAD_INIT(port->list),
+		  .wait_count		= ATOMIC_INIT(0),
+		  .has_connection 	= 0,
+		  .port 	 	= port_num,
+		  .fd  			= fd,
+		  .pending 		= LIST_HEAD_INIT(port->pending),
+		  .connections 		= LIST_HEAD_INIT(port->connections) });
+	spin_lock_init(&port->lock);
+	init_completion(&port->done);
+	list_add(&port->list, &ports);
+
+ found:
+	dev = kmalloc(sizeof(struct port_dev), GFP_KERNEL);
+	if(dev == NULL){
+		printk(KERN_ERR "Allocation of port device entry failed\n");
+		goto out;
+	}
+
+	*dev = ((struct port_dev) { .port  		= port,
+				    .helper_pid  	= -1,
+				    .telnetd_pid  	= -1 });
+	goto out;
+
+ out_free:
+	kfree(port);
+ out_close:
+	os_close_file(fd);
+ out:
+	up(&ports_sem);
+	return(dev);
+}
+
+int port_wait(void *data)
+{
+	struct port_dev *dev = data;
+	struct connection *conn;
+	struct port_list *port = dev->port;
+	int fd;
+
+        atomic_inc(&port->wait_count);
+	while(1){
+		fd = -ERESTARTSYS;
+                if(wait_for_completion_interruptible(&port->done))
+                        goto out;
+
+		spin_lock(&port->lock);
+
+		conn = list_entry(port->connections.next, struct connection, 
+				  list);
+		list_del(&conn->list);
+		spin_unlock(&port->lock);
+
+		os_shutdown_socket(conn->socket[0], 1, 1);
+		os_close_file(conn->socket[0]);
+		os_shutdown_socket(conn->socket[1], 1, 1);
+		os_close_file(conn->socket[1]);	
+
+		/* This is done here because freeing an IRQ can't be done
+		 * within the IRQ handler.  So, pipe_interrupt always ups
+		 * the semaphore regardless of whether it got a successful
+		 * connection.  Then we loop here throwing out failed 
+		 * connections until a good one is found.
+		 */
+		free_irq_by_irq_and_dev(TELNETD_IRQ, conn);
+		free_irq(TELNETD_IRQ, conn);
+
+		if(conn->fd >= 0) break;
+		os_close_file(conn->fd);
+		kfree(conn);
+	}
+
+	fd = conn->fd;
+	dev->helper_pid = conn->helper_pid;
+	dev->telnetd_pid = conn->telnetd_pid;
+	kfree(conn);
+ out:
+	atomic_dec(&port->wait_count);
+	return fd;
+}
+
+void port_remove_dev(void *d)
+{
+	struct port_dev *dev = d;
+
+	if(dev->helper_pid != -1)
+		os_kill_process(dev->helper_pid, 0);
+	if(dev->telnetd_pid != -1)
+		os_kill_process(dev->telnetd_pid, 1);
+	dev->helper_pid = -1;
+	dev->telnetd_pid = -1;
+}
+
+void port_kern_free(void *d)
+{
+	struct port_dev *dev = d;
+
+	port_remove_dev(dev);
+	kfree(dev);
+}
+
+static void free_port(void)
+{
+	struct list_head *ele;
+	struct port_list *port;
+
+	list_for_each(ele, &ports){
+		port = list_entry(ele, struct port_list, list);
+		free_irq_by_fd(port->fd);
+		os_close_file(port->fd);
+	}
+}
+
+__uml_exitcall(free_port);
diff --git a/arch/um/drivers/port_user.c b/arch/um/drivers/port_user.c
new file mode 100644
index 00000000000..14dd2002d2d
--- /dev/null
+++ b/arch/um/drivers/port_user.c
@@ -0,0 +1,225 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <termios.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <netinet/in.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "chan_user.h"
+#include "port.h"
+#include "helper.h"
+#include "os.h"
+
+struct port_chan {
+	int raw;
+	struct termios tt;
+	void *kernel_data;
+	char dev[sizeof("32768\0")];
+};
+
+static void *port_init(char *str, int device, struct chan_opts *opts)
+{
+	struct port_chan *data;
+	void *kern_data;
+	char *end;
+	int port;
+
+	if(*str != ':'){
+		printk("port_init : channel type 'port' must specify a "
+		       "port number\n");
+		return(NULL);
+	}
+	str++;
+	port = strtoul(str, &end, 0);
+	if((*end != '\0') || (end == str)){
+		printk("port_init : couldn't parse port '%s'\n", str);
+		return(NULL);
+	}
+
+	kern_data = port_data(port);
+	if(kern_data == NULL)
+		return(NULL);
+
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL)
+		goto err;
+
+	*data = ((struct port_chan) { .raw  		= opts->raw,
+				      .kernel_data 	= kern_data });
+	sprintf(data->dev, "%d", port);
+
+	return(data);
+ err:
+	port_kern_free(kern_data);
+	return(NULL);
+}
+
+static void port_free(void *d)
+{
+	struct port_chan *data = d;
+
+	port_kern_free(data->kernel_data);
+	kfree(data);
+}
+
+static int port_open(int input, int output, int primary, void *d,
+		     char **dev_out)
+{
+	struct port_chan *data = d;
+	int fd, err;
+
+	fd = port_wait(data->kernel_data);
+	if((fd >= 0) && data->raw){
+		CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+	*dev_out = data->dev;
+	return(fd);
+}
+
+static void port_close(int fd, void *d)
+{
+	struct port_chan *data = d;
+
+	port_remove_dev(data->kernel_data);
+	os_close_file(fd);
+}
+
+static int port_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct port_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops port_ops = {
+	.type		= "port",
+	.init		= port_init,
+	.open		= port_open,
+	.close		= port_close,
+	.read	        = generic_read,
+	.write		= generic_write,
+	.console_write	= port_console_write,
+	.window_size	= generic_window_size,
+	.free		= port_free,
+	.winch		= 1,
+};
+
+int port_listen_fd(int port)
+{
+	struct sockaddr_in addr;
+	int fd, err, arg;
+
+	fd = socket(PF_INET, SOCK_STREAM, 0);
+	if(fd == -1) 
+		return(-errno);
+
+	arg = 1;
+	if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0){
+		err = -errno;
+		goto out;
+	}
+
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(port);
+	addr.sin_addr.s_addr = htonl(INADDR_ANY);
+	if(bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0){
+		err = -errno;
+		goto out;
+	}
+  
+	if(listen(fd, 1) < 0){
+		err = -errno;
+		goto out;
+	}
+
+	err = os_set_fd_block(fd, 0);
+	if(err < 0)
+		goto out;
+
+	return(fd);
+ out:
+	os_close_file(fd);
+	return(err);
+}
+
+struct port_pre_exec_data {
+	int sock_fd;
+	int pipe_fd;
+};
+
+void port_pre_exec(void *arg)
+{
+	struct port_pre_exec_data *data = arg;
+
+	dup2(data->sock_fd, 0);
+	dup2(data->sock_fd, 1);
+	dup2(data->sock_fd, 2);
+	os_close_file(data->sock_fd);
+	dup2(data->pipe_fd, 3);
+	os_shutdown_socket(3, 1, 0);
+	os_close_file(data->pipe_fd);
+}
+
+int port_connection(int fd, int *socket, int *pid_out)
+{
+	int new, err;
+	char *argv[] = { "/usr/sbin/in.telnetd", "-L", 
+			 "/usr/lib/uml/port-helper", NULL };
+	struct port_pre_exec_data data;
+
+	new = os_accept_connection(fd);
+	if(new < 0)
+		return(new);
+
+	err = os_pipe(socket, 0, 0);
+	if(err < 0)
+		goto out_close;
+
+	data = ((struct port_pre_exec_data)
+		{ .sock_fd  		= new,
+		  .pipe_fd 		= socket[1] });
+
+	err = run_helper(port_pre_exec, &data, argv, NULL);
+	if(err < 0) 
+		goto out_shutdown;
+
+	*pid_out = err;
+	return(new);
+
+ out_shutdown:
+	os_shutdown_socket(socket[0], 1, 1);
+	os_close_file(socket[0]);
+	os_shutdown_socket(socket[1], 1, 1);	
+	os_close_file(socket[1]);
+ out_close:
+	os_close_file(new);
+	return(err);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/pty.c b/arch/um/drivers/pty.c
new file mode 100644
index 00000000000..ed84d01df6c
--- /dev/null
+++ b/arch/um/drivers/pty.c
@@ -0,0 +1,162 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <termios.h>
+#include "chan_user.h"
+#include "user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "os.h"
+
+struct pty_chan {
+	void (*announce)(char *dev_name, int dev);
+	int dev;
+	int raw;
+	struct termios tt;
+	char dev_name[sizeof("/dev/pts/0123456\0")];
+};
+
+static void *pty_chan_init(char *str, int device, struct chan_opts *opts)
+{
+	struct pty_chan *data;
+
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL) return(NULL);
+	*data = ((struct pty_chan) { .announce  	= opts->announce, 
+				     .dev  		= device,
+				     .raw  		= opts->raw });
+	return(data);
+}
+
+static int pts_open(int input, int output, int primary, void *d,
+		    char **dev_out)
+{
+	struct pty_chan *data = d;
+	char *dev;
+	int fd, err;
+
+	fd = get_pty();
+	if(fd < 0){
+		printk("open_pts : Failed to open pts\n");
+		return(-errno);
+	}
+	if(data->raw){
+		CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+
+	dev = ptsname(fd);
+	sprintf(data->dev_name, "%s", dev);
+	*dev_out = data->dev_name;
+	if (data->announce)
+		(*data->announce)(dev, data->dev);
+	return(fd);
+}
+
+static int getmaster(char *line)
+{
+	char *pty, *bank, *cp;
+	int master, err;
+
+	pty = &line[strlen("/dev/ptyp")];
+	for (bank = "pqrs"; *bank; bank++) {
+		line[strlen("/dev/pty")] = *bank;
+		*pty = '0';
+		if (os_stat_file(line, NULL) < 0)
+			break;
+		for (cp = "0123456789abcdef"; *cp; cp++) {
+			*pty = *cp;
+			master = os_open_file(line, of_rdwr(OPENFLAGS()), 0);
+			if (master >= 0) {
+				char *tp = &line[strlen("/dev/")];
+
+				/* verify slave side is usable */
+				*tp = 't';
+				err = os_access(line, OS_ACC_RW_OK);
+				*tp = 'p';
+				if(err == 0) return(master);
+				(void) os_close_file(master);
+			}
+		}
+	}
+	return(-1);
+}
+
+static int pty_open(int input, int output, int primary, void *d,
+		    char **dev_out)
+{
+	struct pty_chan *data = d;
+	int fd, err;
+	char dev[sizeof("/dev/ptyxx\0")] = "/dev/ptyxx";
+
+	fd = getmaster(dev);
+	if(fd < 0)
+		return(-errno);
+
+	if(data->raw){
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+	
+	if(data->announce) (*data->announce)(dev, data->dev);
+
+	sprintf(data->dev_name, "%s", dev);
+	*dev_out = data->dev_name;
+	return(fd);
+}
+
+static int pty_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct pty_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops pty_ops = {
+	.type		= "pty",
+	.init		= pty_chan_init,
+	.open		= pty_open,
+	.close		= generic_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= pty_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 0,
+};
+
+struct chan_ops pts_ops = {
+	.type		= "pts",
+	.init		= pty_chan_init,
+	.open		= pts_open,
+	.close		= generic_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= pty_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 0,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/random.c b/arch/um/drivers/random.c
new file mode 100644
index 00000000000..d43e9fab05a
--- /dev/null
+++ b/arch/um/drivers/random.c
@@ -0,0 +1,122 @@
+/* Much of this ripped from hw_random.c */
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include "os.h"
+
+/*
+ * core module and version information
+ */
+#define RNG_VERSION "1.0.0"
+#define RNG_MODULE_NAME "random"
+#define RNG_DRIVER_NAME   RNG_MODULE_NAME " virtual driver " RNG_VERSION
+#define PFX RNG_MODULE_NAME ": "
+
+#define RNG_MISCDEV_MINOR		183 /* official */
+
+static int random_fd = -1;
+
+static int rng_dev_open (struct inode *inode, struct file *filp)
+{
+	/* enforce read-only access to this chrdev */
+	if ((filp->f_mode & FMODE_READ) == 0)
+		return -EINVAL;
+	if (filp->f_mode & FMODE_WRITE)
+		return -EINVAL;
+
+	return 0;
+}
+
+static ssize_t rng_dev_read (struct file *filp, char __user *buf, size_t size,
+                             loff_t * offp)
+{
+        u32 data;
+        int n, ret = 0, have_data;
+
+        while(size){
+                n = os_read_file(random_fd, &data, sizeof(data));
+                if(n > 0){
+                        have_data = n;
+                        while (have_data && size) {
+                                if (put_user((u8)data, buf++)) {
+                                        ret = ret ? : -EFAULT;
+                                        break;
+                                }
+                                size--;
+                                ret++;
+                                have_data--;
+                                data>>=8;
+                        }
+                }
+                else if(n == -EAGAIN){
+                        if (filp->f_flags & O_NONBLOCK)
+                                return ret ? : -EAGAIN;
+
+                        if(need_resched()){
+                                current->state = TASK_INTERRUPTIBLE;
+                                schedule_timeout(1);
+                        }
+                }
+                else return n;
+		if (signal_pending (current))
+			return ret ? : -ERESTARTSYS;
+	}
+	return ret;
+}
+
+static struct file_operations rng_chrdev_ops = {
+	.owner		= THIS_MODULE,
+	.open		= rng_dev_open,
+	.read		= rng_dev_read,
+};
+
+static struct miscdevice rng_miscdev = {
+	RNG_MISCDEV_MINOR,
+	RNG_MODULE_NAME,
+	&rng_chrdev_ops,
+};
+
+/*
+ * rng_init - initialize RNG module
+ */
+static int __init rng_init (void)
+{
+	int err;
+
+        err = os_open_file("/dev/random", of_read(OPENFLAGS()), 0);
+        if(err < 0)
+                goto out;
+
+        random_fd = err;
+
+        err = os_set_fd_block(random_fd, 0);
+        if(err)
+		goto err_out_cleanup_hw;
+
+	err = misc_register (&rng_miscdev);
+	if (err) {
+		printk (KERN_ERR PFX "misc device register failed\n");
+		goto err_out_cleanup_hw;
+	}
+
+ out:
+        return err;
+
+ err_out_cleanup_hw:
+        random_fd = -1;
+        goto out;
+}
+
+/*
+ * rng_cleanup - shutdown RNG module
+ */
+static void __exit rng_cleanup (void)
+{
+	misc_deregister (&rng_miscdev);
+}
+
+module_init (rng_init);
+module_exit (rng_cleanup);
diff --git a/arch/um/drivers/slip.h b/arch/um/drivers/slip.h
new file mode 100644
index 00000000000..495f2f1b142
--- /dev/null
+++ b/arch/um/drivers/slip.h
@@ -0,0 +1,39 @@
+#ifndef __UM_SLIP_H
+#define __UM_SLIP_H
+
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars +  * 
+  * terminating END char + initial END char                            */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+
+struct slip_data {
+	void *dev;
+	char name[sizeof("slnnnnn\0")];
+	char *addr;
+	char *gate_addr;
+	int slave;
+	char ibuf[ENC_BUF_SIZE];
+	char obuf[ENC_BUF_SIZE];
+	int more; /* more data: do not read fd until ibuf has been drained */
+	int pos;
+	int esc;
+};
+
+extern struct net_user_info slip_user_info;
+
+extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
+extern int slip_user_read(int fd, void *buf, int len, struct slip_data *pri);
+extern int slip_user_write(int fd, void *buf, int len, struct slip_data *pri);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slip_kern.c b/arch/um/drivers/slip_kern.c
new file mode 100644
index 00000000000..0886eedba21
--- /dev/null
+++ b/arch/um/drivers/slip_kern.c
@@ -0,0 +1,109 @@
+#include "linux/config.h"
+#include "linux/kernel.h"
+#include "linux/stddef.h"
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/if_arp.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "kern.h"
+#include "slip.h"
+
+struct slip_init {
+	char *gate_addr;
+};
+
+void slip_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *private;
+	struct slip_data *spri;
+	struct slip_init *init = data;
+
+	private = dev->priv;
+	spri = (struct slip_data *) private->user;
+	*spri = ((struct slip_data)
+		{ .name 	= { '\0' },
+		  .addr		= NULL,
+		  .gate_addr 	= init->gate_addr,
+		  .slave  	= -1,
+		  .ibuf  	= { '\0' },
+		  .obuf  	= { '\0' },
+		  .pos 		= 0,
+		  .esc 		= 0,
+		  .dev 		= dev });
+
+	dev->init = NULL;
+	dev->hard_header_len = 0;
+	dev->addr_len = 4;
+	dev->type = ARPHRD_ETHER;
+	dev->tx_queue_len = 256;
+	dev->flags = IFF_NOARP;
+	printk("SLIP backend - SLIP IP = %s\n", spri->gate_addr);
+}
+
+static unsigned short slip_protocol(struct sk_buff *skbuff)
+{
+	return(htons(ETH_P_IP));
+}
+
+static int slip_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	return(slip_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu, 
+			      (struct slip_data *) &lp->user));
+}
+
+static int slip_write(int fd, struct sk_buff **skb,
+		      struct uml_net_private *lp)
+{
+	return(slip_user_write(fd, (*skb)->data, (*skb)->len, 
+			       (struct slip_data *) &lp->user));
+}
+
+struct net_kern_info slip_kern_info = {
+	.init			= slip_init,
+	.protocol		= slip_protocol,
+	.read			= slip_read,
+	.write			= slip_write,
+};
+
+static int slip_setup(char *str, char **mac_out, void *data)
+{
+	struct slip_init *init = data;
+
+	*init = ((struct slip_init)
+		{ .gate_addr 		= NULL });
+
+	if(str[0] != '\0') 
+		init->gate_addr = str;
+	return(1);
+}
+
+static struct transport slip_transport = {
+	.list 		= LIST_HEAD_INIT(slip_transport.list),
+	.name 		= "slip",
+	.setup  	= slip_setup,
+	.user 		= &slip_user_info,
+	.kern 		= &slip_kern_info,
+	.private_size 	= sizeof(struct slip_data),
+	.setup_size 	= sizeof(struct slip_init),
+};
+
+static int register_slip(void)
+{
+	register_transport(&slip_transport);
+	return(1);
+}
+
+__initcall(register_slip);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slip_proto.h b/arch/um/drivers/slip_proto.h
new file mode 100644
index 00000000000..7206361ace4
--- /dev/null
+++ b/arch/um/drivers/slip_proto.h
@@ -0,0 +1,93 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_SLIP_PROTO_H__
+#define __UM_SLIP_PROTO_H__
+
+/* SLIP protocol characters. */
+#define SLIP_END             0300	/* indicates end of frame	*/
+#define SLIP_ESC             0333	/* indicates byte stuffing	*/
+#define SLIP_ESC_END         0334	/* ESC ESC_END means END 'data'	*/
+#define SLIP_ESC_ESC         0335	/* ESC ESC_ESC means ESC 'data'	*/
+
+static inline int slip_unesc(unsigned char c,char *buf,int *pos, int *esc)
+{
+	int ret;
+
+	switch(c){
+	case SLIP_END:
+		*esc = 0;
+		ret=*pos;
+		*pos=0;
+		return(ret);
+	case SLIP_ESC:
+		*esc = 1;
+		return(0);
+	case SLIP_ESC_ESC:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_ESC;
+		}
+		break;
+	case SLIP_ESC_END:
+		if(*esc){
+			*esc = 0;
+			c = SLIP_END;
+		}
+		break;
+	}
+	buf[(*pos)++] = c;
+	return(0);
+}
+
+static inline int slip_esc(unsigned char *s, unsigned char *d, int len)
+{
+	unsigned char *ptr = d;
+	unsigned char c;
+
+	/*
+	 * Send an initial END character to flush out any
+	 * data that may have accumulated in the receiver
+	 * due to line noise.
+	 */
+
+	*ptr++ = SLIP_END;
+
+	/*
+	 * For each byte in the packet, send the appropriate
+	 * character sequence, according to the SLIP protocol.
+	 */
+
+	while (len-- > 0) {
+		switch(c = *s++) {
+		case SLIP_END:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_END;
+			break;
+		case SLIP_ESC:
+			*ptr++ = SLIP_ESC;
+			*ptr++ = SLIP_ESC_ESC;
+			break;
+		default:
+			*ptr++ = c;
+			break;
+		}
+	}
+	*ptr++ = SLIP_END;
+	return (ptr - d);
+}
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slip_user.c b/arch/um/drivers/slip_user.c
new file mode 100644
index 00000000000..d94846b1b4c
--- /dev/null
+++ b/arch/um/drivers/slip_user.c
@@ -0,0 +1,280 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/termios.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "net_user.h"
+#include "slip.h"
+#include "slip_proto.h"
+#include "helper.h"
+#include "os.h"
+
+void slip_user_init(void *data, void *dev)
+{
+	struct slip_data *pri = data;
+
+	pri->dev = dev;
+}
+
+static int set_up_tty(int fd)
+{
+	int i;
+	struct termios tios;
+
+	if (tcgetattr(fd, &tios) < 0) {
+		printk("could not get initial terminal attributes\n");
+		return(-1);
+	}
+
+	tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
+	tios.c_iflag = IGNBRK | IGNPAR;
+	tios.c_oflag = 0;
+	tios.c_lflag = 0;
+	for (i = 0; i < NCCS; i++)
+		tios.c_cc[i] = 0;
+	tios.c_cc[VMIN] = 1;
+	tios.c_cc[VTIME] = 0;
+
+	cfsetospeed(&tios, B38400);
+	cfsetispeed(&tios, B38400);
+
+	if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
+		printk("failed to set terminal attributes\n");
+		return(-1);
+	}
+	return(0);
+}
+
+struct slip_pre_exec_data {
+	int stdin;
+	int stdout;
+	int close_me;
+};
+
+static void slip_pre_exec(void *arg)
+{
+	struct slip_pre_exec_data *data = arg;
+
+	if(data->stdin >= 0) dup2(data->stdin, 0);
+	dup2(data->stdout, 1);
+	if(data->close_me >= 0) os_close_file(data->close_me);
+}
+
+static int slip_tramp(char **argv, int fd)
+{
+	struct slip_pre_exec_data pe_data;
+	char *output;
+	int status, pid, fds[2], err, output_len;
+
+	err = os_pipe(fds, 1, 0);
+	if(err < 0){
+		printk("slip_tramp : pipe failed, err = %d\n", -err);
+		return(err);
+	}
+
+	err = 0;
+	pe_data.stdin = fd;
+	pe_data.stdout = fds[1];
+	pe_data.close_me = fds[0];
+	pid = run_helper(slip_pre_exec, &pe_data, argv, NULL);
+
+	if(pid < 0) err = pid;
+	else {
+		output_len = page_size();
+		output = um_kmalloc(output_len);
+		if(output == NULL)
+			printk("slip_tramp : failed to allocate output "
+			       "buffer\n");
+
+		os_close_file(fds[1]);
+		read_output(fds[0], output, output_len);
+		if(output != NULL){
+			printk("%s", output);
+			kfree(output);
+		}
+		CATCH_EINTR(err = waitpid(pid, &status, 0));
+		if(err < 0)
+			err = errno;
+		else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
+			printk("'%s' didn't exit with status 0\n", argv[0]);
+			err = -EINVAL;
+		}
+	}
+
+	os_close_file(fds[0]);
+
+	return(err);
+}
+
+static int slip_open(void *data)
+{
+	struct slip_data *pri = data;
+	char version_buf[sizeof("nnnnn\0")];
+	char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+	char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf, 
+			 NULL };
+	int sfd, mfd, err;
+
+	mfd = get_pty();
+	if(mfd < 0){
+		printk("umn : Failed to open pty, err = %d\n", -mfd);
+		return(mfd);
+	}
+	sfd = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
+	if(sfd < 0){
+		printk("Couldn't open tty for slip line, err = %d\n", -sfd);
+		os_close_file(mfd);
+		return(sfd);
+	}
+	if(set_up_tty(sfd)) return(-1);
+	pri->slave = sfd;
+	pri->pos = 0;
+	pri->esc = 0;
+	if(pri->gate_addr != NULL){
+		sprintf(version_buf, "%d", UML_NET_VERSION);
+		strcpy(gate_buf, pri->gate_addr);
+
+		err = slip_tramp(argv, sfd);
+
+		if(err < 0){
+			printk("slip_tramp failed - err = %d\n", -err);
+			return(err);
+		}
+		err = os_get_ifname(pri->slave, pri->name);
+		if(err < 0){
+			printk("get_ifname failed, err = %d\n", -err);
+			return(err);
+		}
+		iter_addresses(pri->dev, open_addr, pri->name);
+	}
+	else {
+		err = os_set_slip(sfd);
+		if(err < 0){
+			printk("Failed to set slip discipline encapsulation - "
+			       "err = %d\n", -err);
+			return(err);
+		}
+	}
+	return(mfd);
+}
+
+static void slip_close(int fd, void *data)
+{
+	struct slip_data *pri = data;
+	char version_buf[sizeof("nnnnn\0")];
+	char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name, 
+			 NULL };
+	int err;
+
+	if(pri->gate_addr != NULL)
+		iter_addresses(pri->dev, close_addr, pri->name);
+
+	sprintf(version_buf, "%d", UML_NET_VERSION);
+
+	err = slip_tramp(argv, pri->slave);
+
+	if(err != 0)
+		printk("slip_tramp failed - errno = %d\n", -err);
+	os_close_file(fd);
+	os_close_file(pri->slave);
+	pri->slave = -1;
+}
+
+int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
+{
+	int i, n, size, start;
+
+	if(pri->more>0) {
+		i = 0;
+		while(i < pri->more) {
+			size = slip_unesc(pri->ibuf[i++],
+					pri->ibuf, &pri->pos, &pri->esc);
+			if(size){
+				memcpy(buf, pri->ibuf, size);
+				memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
+				pri->more=pri->more-i; 
+				return(size);
+			}
+		}
+		pri->more=0;
+	}
+
+	n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
+	if(n <= 0) return(n);
+
+	start = pri->pos;
+	for(i = 0; i < n; i++){
+		size = slip_unesc(pri->ibuf[start + i],
+				pri->ibuf, &pri->pos, &pri->esc);
+		if(size){
+			memcpy(buf, pri->ibuf, size);
+			memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
+			pri->more=n-(i+1); 
+			return(size);
+		}
+	}
+	return(0);
+}
+
+int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
+{
+	int actual, n;
+
+	actual = slip_esc(buf, pri->obuf, len);
+	n = net_write(fd, pri->obuf, actual);
+	if(n < 0) return(n);
+	else return(len);
+}
+
+static int slip_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
+			  void *data)
+{
+	struct slip_data *pri = data;
+
+	if(pri->slave < 0) return;
+	open_addr(addr, netmask, pri->name);
+}
+
+static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct slip_data *pri = data;
+
+	if(pri->slave < 0) return;
+	close_addr(addr, netmask, pri->name);
+}
+
+struct net_user_info slip_user_info = {
+	.init		= slip_user_init,
+	.open		= slip_open,
+	.close	 	= slip_close,
+	.remove	 	= NULL,
+	.set_mtu	= slip_set_mtu,
+	.add_address	= slip_add_addr,
+	.delete_address = slip_del_addr,
+	.max_packet	= BUF_SIZE
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slirp.h b/arch/um/drivers/slirp.h
new file mode 100644
index 00000000000..04e407d1e44
--- /dev/null
+++ b/arch/um/drivers/slirp.h
@@ -0,0 +1,51 @@
+#ifndef __UM_SLIRP_H
+#define __UM_SLIRP_H
+
+#define BUF_SIZE 1500
+ /* two bytes each for a (pathological) max packet of escaped chars +  * 
+  * terminating END char + initial END char                            */
+#define ENC_BUF_SIZE (2 * BUF_SIZE + 2)
+
+#define SLIRP_MAX_ARGS 100
+/*
+ * XXX this next definition is here because I don't understand why this
+ * initializer doesn't work in slirp_kern.c:
+ *
+ *   argv :  { init->argv[ 0 ... SLIRP_MAX_ARGS-1 ] },
+ *
+ * or why I can't typecast like this:
+ *
+ *   argv :  (char* [SLIRP_MAX_ARGS])(init->argv), 
+ */
+struct arg_list_dummy_wrapper { char *argv[SLIRP_MAX_ARGS]; };
+
+struct slirp_data {
+	void *dev;
+	struct arg_list_dummy_wrapper argw;
+	int pid;
+	int slave;
+	char ibuf[ENC_BUF_SIZE];
+	char obuf[ENC_BUF_SIZE];
+	int more; /* more data: do not read fd until ibuf has been drained */
+	int pos;
+	int esc;
+};
+
+extern struct net_user_info slirp_user_info;
+
+extern int set_umn_addr(int fd, char *addr, char *ptp_addr);
+extern int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri);
+extern int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slirp_kern.c b/arch/um/drivers/slirp_kern.c
new file mode 100644
index 00000000000..c9d6b52a831
--- /dev/null
+++ b/arch/um/drivers/slirp_kern.c
@@ -0,0 +1,135 @@
+#include "linux/kernel.h"
+#include "linux/stddef.h"
+#include "linux/init.h"
+#include "linux/netdevice.h"
+#include "linux/if_arp.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "kern.h"
+#include "slirp.h"
+
+struct slirp_init {
+	struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
+};
+
+void slirp_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *private;
+	struct slirp_data *spri;
+	struct slirp_init *init = data;
+	int i;
+
+	private = dev->priv;
+	spri = (struct slirp_data *) private->user;
+	*spri = ((struct slirp_data)
+		{ .argw 	= init->argw,
+		  .pid  	= -1,
+		  .slave  	= -1,
+		  .ibuf  	= { '\0' },
+		  .obuf  	= { '\0' },
+		  .pos 		= 0,
+		  .esc 		= 0,
+		  .dev 		= dev });
+
+	dev->init = NULL;
+	dev->hard_header_len = 0;
+	dev->header_cache_update = NULL;
+	dev->hard_header_cache = NULL;
+	dev->hard_header = NULL;
+	dev->addr_len = 0;
+	dev->type = ARPHRD_SLIP;
+	dev->tx_queue_len = 256;
+	dev->flags = IFF_NOARP;
+	printk("SLIRP backend - command line:");
+	for(i=0;spri->argw.argv[i]!=NULL;i++) {
+		printk(" '%s'",spri->argw.argv[i]);
+	}
+	printk("\n");
+}
+
+static unsigned short slirp_protocol(struct sk_buff *skbuff)
+{
+	return(htons(ETH_P_IP));
+}
+
+static int slirp_read(int fd, struct sk_buff **skb, 
+		       struct uml_net_private *lp)
+{
+	return(slirp_user_read(fd, (*skb)->mac.raw, (*skb)->dev->mtu, 
+			      (struct slirp_data *) &lp->user));
+}
+
+static int slirp_write(int fd, struct sk_buff **skb,
+		      struct uml_net_private *lp)
+{
+	return(slirp_user_write(fd, (*skb)->data, (*skb)->len, 
+			       (struct slirp_data *) &lp->user));
+}
+
+struct net_kern_info slirp_kern_info = {
+	.init			= slirp_init,
+	.protocol		= slirp_protocol,
+	.read			= slirp_read,
+	.write			= slirp_write,
+};
+
+static int slirp_setup(char *str, char **mac_out, void *data)
+{
+	struct slirp_init *init = data;
+	int i=0;
+
+	*init = ((struct slirp_init)
+		{ argw :		{ { "slirp", NULL  } } });
+
+	str = split_if_spec(str, mac_out, NULL);
+
+	if(str == NULL) { /* no command line given after MAC addr */
+		return(1);
+	}
+
+	do {
+		if(i>=SLIRP_MAX_ARGS-1) {
+			printk("slirp_setup: truncating slirp arguments\n");
+			break;
+		}
+		init->argw.argv[i++] = str;
+		while(*str && *str!=',') {
+			if(*str=='_') *str=' ';
+			str++;
+		}
+		if(*str!=',')
+			break;
+		*str++='\0';
+	} while(1);
+	init->argw.argv[i]=NULL;
+	return(1);
+}
+
+static struct transport slirp_transport = {
+	.list 		= LIST_HEAD_INIT(slirp_transport.list),
+	.name 		= "slirp",
+	.setup  	= slirp_setup,
+	.user 		= &slirp_user_info,
+	.kern 		= &slirp_kern_info,
+	.private_size 	= sizeof(struct slirp_data),
+	.setup_size 	= sizeof(struct slirp_init),
+};
+
+static int register_slirp(void)
+{
+	register_transport(&slirp_transport);
+	return(1);
+}
+
+__initcall(register_slirp);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
new file mode 100644
index 00000000000..c322515c71c
--- /dev/null
+++ b/arch/um/drivers/slirp_user.c
@@ -0,0 +1,201 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "net_user.h"
+#include "slirp.h"
+#include "slip_proto.h"
+#include "helper.h"
+#include "os.h"
+
+void slirp_user_init(void *data, void *dev)
+{
+	struct slirp_data *pri = data;
+
+	pri->dev = dev;
+}
+
+struct slirp_pre_exec_data {
+	int stdin;
+	int stdout;
+};
+
+static void slirp_pre_exec(void *arg)
+{
+	struct slirp_pre_exec_data *data = arg;
+
+	if(data->stdin != -1) dup2(data->stdin, 0);
+	if(data->stdout != -1) dup2(data->stdout, 1);
+}
+
+static int slirp_tramp(char **argv, int fd)
+{
+	struct slirp_pre_exec_data pe_data;
+	int pid;
+
+	pe_data.stdin = fd;
+	pe_data.stdout = fd;
+	pid = run_helper(slirp_pre_exec, &pe_data, argv, NULL);
+
+	return(pid);
+}
+
+/* XXX This is just a trivial wrapper around os_pipe */
+static int slirp_datachan(int *mfd, int *sfd)
+{
+	int fds[2], err;
+
+	err = os_pipe(fds, 1, 1);
+	if(err < 0){
+		printk("slirp_datachan: Failed to open pipe, err = %d\n", -err);
+		return(err);
+	}
+
+	*mfd = fds[0];
+	*sfd = fds[1];
+	return(0);
+}
+
+static int slirp_open(void *data)
+{
+	struct slirp_data *pri = data;
+	int sfd, mfd, pid, err;
+
+	err = slirp_datachan(&mfd, &sfd);
+	if(err)
+		return(err);
+
+	pid = slirp_tramp(pri->argw.argv, sfd);
+
+	if(pid < 0){
+		printk("slirp_tramp failed - errno = %d\n", -pid);
+		os_close_file(sfd);	
+		os_close_file(mfd);	
+		return(pid);
+	}
+
+	pri->slave = sfd;
+	pri->pos = 0;
+	pri->esc = 0;
+
+	pri->pid = pid;
+
+	return(mfd);
+}
+
+static void slirp_close(int fd, void *data)
+{
+	struct slirp_data *pri = data;
+	int status,err;
+
+	os_close_file(fd);
+	os_close_file(pri->slave);
+
+	pri->slave = -1;
+
+	if(pri->pid<1) {
+		printk("slirp_close: no child process to shut down\n");
+		return;
+	}
+
+#if 0
+	if(kill(pri->pid, SIGHUP)<0) {
+		printk("slirp_close: sending hangup to %d failed (%d)\n",
+			pri->pid, errno);
+	}
+#endif
+
+	CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG));
+	if(err < 0) {
+		printk("slirp_close: waitpid returned %d\n", errno);
+		return;
+	}
+
+	if(err == 0) {
+		printk("slirp_close: process %d has not exited\n");
+		return;
+	}
+
+	pri->pid = -1;
+}
+
+int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int i, n, size, start;
+
+	if(pri->more>0) {
+		i = 0;
+		while(i < pri->more) {
+			size = slip_unesc(pri->ibuf[i++],
+					pri->ibuf,&pri->pos,&pri->esc);
+			if(size){
+				memcpy(buf, pri->ibuf, size);
+				memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
+				pri->more=pri->more-i; 
+				return(size);
+			}
+		}
+		pri->more=0;
+	}
+
+	n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
+	if(n <= 0) return(n);
+
+	start = pri->pos;
+	for(i = 0; i < n; i++){
+		size = slip_unesc(pri->ibuf[start + i],
+				pri->ibuf,&pri->pos,&pri->esc);
+		if(size){
+			memcpy(buf, pri->ibuf, size);
+			memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
+			pri->more=n-(i+1); 
+			return(size);
+		}
+	}
+	return(0);
+}
+
+int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int actual, n;
+
+	actual = slip_esc(buf, pri->obuf, len);
+	n = net_write(fd, pri->obuf, actual);
+	if(n < 0) return(n);
+	else return(len);
+}
+
+static int slirp_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info slirp_user_info = {
+	.init		= slirp_user_init,
+	.open		= slirp_open,
+	.close	 	= slirp_close,
+	.remove	 	= NULL,
+	.set_mtu	= slirp_set_mtu,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= BUF_SIZE
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
new file mode 100644
index 00000000000..c5839c3141f
--- /dev/null
+++ b/arch/um/drivers/ssl.c
@@ -0,0 +1,251 @@
+/* 
+ * Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/fs.h"
+#include "linux/tty.h"
+#include "linux/tty_driver.h"
+#include "linux/major.h"
+#include "linux/mm.h"
+#include "linux/init.h"
+#include "linux/console.h"
+#include "asm/termbits.h"
+#include "asm/irq.h"
+#include "line.h"
+#include "ssl.h"
+#include "chan_kern.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "init.h"
+#include "irq_user.h"
+#include "mconsole_kern.h"
+#include "2_5compat.h"
+
+static int ssl_version = 1;
+
+/* Referenced only by tty_driver below - presumably it's locked correctly
+ * by the tty driver.
+ */
+
+static struct tty_driver *ssl_driver;
+
+#define NR_PORTS 64
+
+void ssl_announce(char *dev_name, int dev)
+{
+	printk(KERN_INFO "Serial line %d assigned device '%s'\n", dev,
+	       dev_name);
+}
+
+static struct chan_opts opts = {
+	.announce 	= ssl_announce,
+	.xterm_title	= "Serial Line #%d",
+	.raw		= 1,
+	.tramp_stack 	= 0,
+	.in_kernel 	= 1,
+};
+
+static int ssl_config(char *str);
+static int ssl_get_config(char *dev, char *str, int size, char **error_out);
+static int ssl_remove(char *str);
+
+static struct line_driver driver = {
+	.name 			= "UML serial line",
+	.device_name 		= "ttyS",
+	.devfs_name 		= "tts/",
+	.major 			= TTY_MAJOR,
+	.minor_start 		= 64,
+	.type 		 	= TTY_DRIVER_TYPE_SERIAL,
+	.subtype 	 	= 0,
+	.read_irq 		= SSL_IRQ,
+	.read_irq_name 		= "ssl",
+	.write_irq 		= SSL_WRITE_IRQ,
+	.write_irq_name 	= "ssl-write",
+	.symlink_from 		= "serial",
+	.symlink_to 		= "tts",
+	.mc  = {
+		.name  		= "ssl",
+		.config 	= ssl_config,
+		.get_config 	= ssl_get_config,
+		.remove 	= ssl_remove,
+	},
+};
+
+/* The array is initialized by line_init, which is an initcall.  The 
+ * individual elements are protected by individual semaphores.
+ */
+static struct line serial_lines[NR_PORTS] =
+	{ [0 ... NR_PORTS - 1] = LINE_INIT(CONFIG_SSL_CHAN, &driver) };
+
+static struct lines lines = LINES_INIT(NR_PORTS);
+
+static int ssl_config(char *str)
+{
+	return(line_config(serial_lines, 
+			   sizeof(serial_lines)/sizeof(serial_lines[0]), str));
+}
+
+static int ssl_get_config(char *dev, char *str, int size, char **error_out)
+{
+	return(line_get_config(dev, serial_lines, 
+			       sizeof(serial_lines)/sizeof(serial_lines[0]), 
+			       str, size, error_out));
+}
+
+static int ssl_remove(char *str)
+{
+	return(line_remove(serial_lines, 
+			   sizeof(serial_lines)/sizeof(serial_lines[0]), str));
+}
+
+int ssl_open(struct tty_struct *tty, struct file *filp)
+{
+	return line_open(serial_lines, tty, &opts);
+}
+
+#if 0
+static int ssl_chars_in_buffer(struct tty_struct *tty)
+{
+	return(0);
+}
+
+static void ssl_flush_buffer(struct tty_struct *tty)
+{
+	return;
+}
+
+static void ssl_throttle(struct tty_struct * tty)
+{
+	printk(KERN_ERR "Someone should implement ssl_throttle\n");
+}
+
+static void ssl_unthrottle(struct tty_struct * tty)
+{
+	printk(KERN_ERR "Someone should implement ssl_unthrottle\n");
+}
+
+static void ssl_stop(struct tty_struct *tty)
+{
+	printk(KERN_ERR "Someone should implement ssl_stop\n");
+}
+
+static void ssl_start(struct tty_struct *tty)
+{
+	printk(KERN_ERR "Someone should implement ssl_start\n");
+}
+
+void ssl_hangup(struct tty_struct *tty)
+{
+}
+#endif
+
+static struct tty_operations ssl_ops = {
+	.open 	 		= ssl_open,
+	.close 	 		= line_close,
+	.write 	 		= line_write,
+	.put_char 		= line_put_char,
+	.write_room		= line_write_room,
+	.chars_in_buffer 	= line_chars_in_buffer,
+	.set_termios 		= line_set_termios,
+	.ioctl 	 		= line_ioctl,
+#if 0
+	.flush_chars 		= ssl_flush_chars,
+	.flush_buffer 		= ssl_flush_buffer,
+	.throttle 		= ssl_throttle,
+	.unthrottle 		= ssl_unthrottle,
+	.stop 	 		= ssl_stop,
+	.start 	 		= ssl_start,
+	.hangup 	 	= ssl_hangup,
+#endif
+};
+
+/* Changed by ssl_init and referenced by ssl_exit, which are both serialized
+ * by being an initcall and exitcall, respectively.
+ */
+static int ssl_init_done = 0;
+
+static void ssl_console_write(struct console *c, const char *string,
+			      unsigned len)
+{
+	struct line *line = &serial_lines[c->index];
+
+	down(&line->sem);
+	console_write_chan(&line->chan_list, string, len);
+	up(&line->sem);
+}
+
+static struct tty_driver *ssl_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return ssl_driver;
+}
+
+static int ssl_console_setup(struct console *co, char *options)
+{
+	struct line *line = &serial_lines[co->index];
+
+	return console_open_chan(line,co,&opts);
+}
+
+static struct console ssl_cons = {
+	.name		= "ttyS",
+	.write		= ssl_console_write,
+	.device		= ssl_console_device,
+	.setup		= ssl_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+};
+
+int ssl_init(void)
+{
+	char *new_title;
+
+	printk(KERN_INFO "Initializing software serial port version %d\n", 
+	       ssl_version);
+	ssl_driver = line_register_devfs(&lines, &driver, &ssl_ops,
+					 serial_lines, ARRAY_SIZE(serial_lines));
+
+	lines_init(serial_lines, sizeof(serial_lines)/sizeof(serial_lines[0]));
+
+	new_title = add_xterm_umid(opts.xterm_title);
+	if (new_title != NULL)
+		opts.xterm_title = new_title;
+
+	ssl_init_done = 1;
+	register_console(&ssl_cons);
+	return(0);
+}
+late_initcall(ssl_init);
+
+static void ssl_exit(void)
+{
+	if (!ssl_init_done)
+		return;
+	close_lines(serial_lines,
+		    sizeof(serial_lines)/sizeof(serial_lines[0]));
+}
+__uml_exitcall(ssl_exit);
+
+static int ssl_chan_setup(char *str)
+{
+	return(line_setup(serial_lines,
+			  sizeof(serial_lines)/sizeof(serial_lines[0]),
+			  str, 1));
+}
+
+__setup("ssl", ssl_chan_setup);
+__channel_help(ssl_chan_setup, "ssl");
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/ssl.h b/arch/um/drivers/ssl.h
new file mode 100644
index 00000000000..98412aa6660
--- /dev/null
+++ b/arch/um/drivers/ssl.h
@@ -0,0 +1,23 @@
+/* 
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SSL_H__
+#define __SSL_H__
+
+extern int ssl_read(int fd, int line);
+extern void ssl_receive_char(int line, char ch);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/stderr_console.c b/arch/um/drivers/stderr_console.c
new file mode 100644
index 00000000000..98565b53d17
--- /dev/null
+++ b/arch/um/drivers/stderr_console.c
@@ -0,0 +1,45 @@
+#include <linux/init.h>
+#include <linux/console.h>
+
+#include "chan_user.h"
+
+/* ----------------------------------------------------------------------------- */
+/* trivial console driver -- simply dump everything to stderr                    */
+
+/*
+ * Don't register by default -- as this registeres very early in the
+ * boot process it becomes the default console.  And as this isn't a
+ * real tty driver init isn't able to open /dev/console then.
+ *
+ * In most cases this isn't what you want ...
+ */
+static int use_stderr_console = 0;
+
+static void stderr_console_write(struct console *console, const char *string,
+				 unsigned len)
+{
+	generic_write(2 /* stderr */, string, len, NULL);
+}
+
+static struct console stderr_console = {
+	.name		"stderr",
+	.write		stderr_console_write,
+	.flags		CON_PRINTBUFFER,
+};
+
+static int __init stderr_console_init(void)
+{
+	if (use_stderr_console)
+		register_console(&stderr_console);
+	return 0;
+}
+console_initcall(stderr_console_init);
+
+static int stderr_setup(char *str)
+{
+	if (!str)
+		return 0;
+	use_stderr_console = simple_strtoul(str,&str,0);
+	return 1;
+}
+__setup("stderr=", stderr_setup);
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
new file mode 100644
index 00000000000..e604d7c8769
--- /dev/null
+++ b/arch/um/drivers/stdio_console.c
@@ -0,0 +1,205 @@
+/* 
+ * Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/posix_types.h"
+#include "linux/tty.h"
+#include "linux/tty_flip.h"
+#include "linux/types.h"
+#include "linux/major.h"
+#include "linux/kdev_t.h"
+#include "linux/console.h"
+#include "linux/string.h"
+#include "linux/sched.h"
+#include "linux/list.h"
+#include "linux/init.h"
+#include "linux/interrupt.h"
+#include "linux/slab.h"
+#include "linux/hardirq.h"
+#include "asm/current.h"
+#include "asm/irq.h"
+#include "stdio_console.h"
+#include "line.h"
+#include "chan_kern.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "irq_user.h"
+#include "mconsole_kern.h"
+#include "init.h"
+#include "2_5compat.h"
+
+#define MAX_TTYS (16)
+
+/* ----------------------------------------------------------------------------- */
+
+/* Referenced only by tty_driver below - presumably it's locked correctly
+ * by the tty driver.
+ */
+
+static struct tty_driver *console_driver;
+
+void stdio_announce(char *dev_name, int dev)
+{
+	printk(KERN_INFO "Virtual console %d assigned device '%s'\n", dev,
+	       dev_name);
+}
+
+static struct chan_opts opts = {
+	.announce 	= stdio_announce,
+	.xterm_title	= "Virtual Console #%d",
+	.raw		= 1,
+	.tramp_stack 	= 0,
+	.in_kernel 	= 1,
+};
+
+static int con_config(char *str);
+static int con_get_config(char *dev, char *str, int size, char **error_out);
+static int con_remove(char *str);
+
+static struct line_driver driver = {
+	.name 			= "UML console",
+	.device_name 		= "tty",
+	.devfs_name 		= "vc/",
+	.major 			= TTY_MAJOR,
+	.minor_start 		= 0,
+	.type 		 	= TTY_DRIVER_TYPE_CONSOLE,
+	.subtype 	 	= SYSTEM_TYPE_CONSOLE,
+	.read_irq 		= CONSOLE_IRQ,
+	.read_irq_name 		= "console",
+	.write_irq 		= CONSOLE_WRITE_IRQ,
+	.write_irq_name 	= "console-write",
+	.symlink_from 		= "ttys",
+	.symlink_to 		= "vc",
+	.mc  = {
+		.name  		= "con",
+		.config 	= con_config,
+		.get_config 	= con_get_config,
+		.remove 	= con_remove,
+	},
+};
+
+static struct lines console_lines = LINES_INIT(MAX_TTYS);
+
+/* The array is initialized by line_init, which is an initcall.  The 
+ * individual elements are protected by individual semaphores.
+ */
+struct line vts[MAX_TTYS] = { LINE_INIT(CONFIG_CON_ZERO_CHAN, &driver),
+			      [ 1 ... MAX_TTYS - 1 ] = 
+			      LINE_INIT(CONFIG_CON_CHAN, &driver) };
+
+static int con_config(char *str)
+{
+	return(line_config(vts, sizeof(vts)/sizeof(vts[0]), str));
+}
+
+static int con_get_config(char *dev, char *str, int size, char **error_out)
+{
+	return(line_get_config(dev, vts, sizeof(vts)/sizeof(vts[0]), str, 
+			       size, error_out));
+}
+
+static int con_remove(char *str)
+{
+	return(line_remove(vts, sizeof(vts)/sizeof(vts[0]), str));
+}
+
+static int con_open(struct tty_struct *tty, struct file *filp)
+{
+	return line_open(vts, tty, &opts);
+}
+
+static int con_init_done = 0;
+
+static struct tty_operations console_ops = {
+	.open 	 		= con_open,
+	.close 	 		= line_close,
+	.write 	 		= line_write,
+ 	.write_room		= line_write_room,
+	.chars_in_buffer 	= line_chars_in_buffer,
+	.set_termios 		= line_set_termios,
+	.ioctl 	 		= line_ioctl,
+};
+
+static void uml_console_write(struct console *console, const char *string,
+			  unsigned len)
+{
+	struct line *line = &vts[console->index];
+
+	down(&line->sem);
+	console_write_chan(&line->chan_list, string, len);
+	up(&line->sem);
+}
+
+static struct tty_driver *uml_console_device(struct console *c, int *index)
+{
+	*index = c->index;
+	return console_driver;
+}
+
+static int uml_console_setup(struct console *co, char *options)
+{
+	struct line *line = &vts[co->index];
+
+	return console_open_chan(line,co,&opts);
+}
+
+static struct console stdiocons = {
+	.name		= "tty",
+	.write		= uml_console_write,
+	.device		= uml_console_device,
+	.setup		= uml_console_setup,
+	.flags		= CON_PRINTBUFFER,
+	.index		= -1,
+	.data           = &vts,
+};
+
+int stdio_init(void)
+{
+	char *new_title;
+
+	console_driver = line_register_devfs(&console_lines, &driver,
+					     &console_ops, vts,
+					     ARRAY_SIZE(vts));
+	if (NULL == console_driver)
+		return -1;
+	printk(KERN_INFO "Initialized stdio console driver\n");
+
+	lines_init(vts, sizeof(vts)/sizeof(vts[0]));
+
+	new_title = add_xterm_umid(opts.xterm_title);
+	if(new_title != NULL)
+		opts.xterm_title = new_title;
+
+	con_init_done = 1;
+	register_console(&stdiocons);
+	return(0);
+}
+late_initcall(stdio_init);
+
+static void console_exit(void)
+{
+	if (!con_init_done)
+		return;
+	close_lines(vts, sizeof(vts)/sizeof(vts[0]));
+}
+__uml_exitcall(console_exit);
+
+static int console_chan_setup(char *str)
+{
+	return(line_setup(vts, sizeof(vts)/sizeof(vts[0]), str, 1));
+}
+__setup("con", console_chan_setup);
+__channel_help(console_chan_setup, "con");
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/stdio_console.h b/arch/um/drivers/stdio_console.h
new file mode 100644
index 00000000000..505a3d5bea5
--- /dev/null
+++ b/arch/um/drivers/stdio_console.h
@@ -0,0 +1,21 @@
+/* 
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __STDIO_CONSOLE_H
+#define __STDIO_CONSOLE_H
+
+extern void save_console_flags(void);
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/tty.c b/arch/um/drivers/tty.c
new file mode 100644
index 00000000000..6fbb670ee27
--- /dev/null
+++ b/arch/um/drivers/tty.c
@@ -0,0 +1,92 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <termios.h>
+#include <errno.h>
+#include <unistd.h>
+#include "chan_user.h"
+#include "user_util.h"
+#include "user.h"
+#include "os.h"
+
+struct tty_chan {
+	char *dev;
+	int raw;
+	struct termios tt;
+};
+
+static void *tty_chan_init(char *str, int device, struct chan_opts *opts)
+{
+	struct tty_chan *data;
+
+	if(*str != ':'){
+		printk("tty_init : channel type 'tty' must specify "
+		       "a device\n");
+		return(NULL);
+	}
+	str++;
+
+	data = um_kmalloc(sizeof(*data));
+	if(data == NULL)
+		return(NULL);
+	*data = ((struct tty_chan) { .dev 	= str,
+				     .raw 	= opts->raw });
+				     
+	return(data);
+}
+
+static int tty_open(int input, int output, int primary, void *d,
+		    char **dev_out)
+{
+	struct tty_chan *data = d;
+	int fd, err;
+
+	fd = os_open_file(data->dev, of_set_rw(OPENFLAGS(), input, output), 0);
+	if(fd < 0) return(fd);
+	if(data->raw){
+		CATCH_EINTR(err = tcgetattr(fd, &data->tt));
+		if(err)
+			return(err);
+
+		err = raw(fd);
+		if(err)
+			return(err);
+	}
+
+	*dev_out = data->dev;
+	return(fd);
+}
+
+static int tty_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct tty_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops tty_ops = {
+	.type		= "tty",
+	.init		= tty_chan_init,
+	.open		= tty_open,
+	.close		= generic_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= tty_console_write,
+	.window_size	= generic_window_size,
+	.free		= generic_free,
+	.winch		= 0,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
new file mode 100644
index 00000000000..4d8b165bfa4
--- /dev/null
+++ b/arch/um/drivers/ubd_kern.c
@@ -0,0 +1,1669 @@
+/* 
+ * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+/* 2001-09-28...2002-04-17
+ * Partition stuff by James_McMechan@hotmail.com
+ * old style ubd by setting UBD_SHIFT to 0
+ * 2002-09-27...2002-10-18 massive tinkering for 2.5
+ * partitions have changed in 2.5
+ * 2003-01-29 more tinkering for 2.5.59-1
+ * This should now address the sysfs problems and has
+ * the symlink for devfs to allow for booting with
+ * the common /dev/ubd/discX/... names rather than
+ * only /dev/ubdN/discN this version also has lots of
+ * clean ups preparing for ubd-many.
+ * James McMechan
+ */
+
+#define MAJOR_NR UBD_MAJOR
+#define UBD_SHIFT 4
+
+#include "linux/config.h"
+#include "linux/module.h"
+#include "linux/blkdev.h"
+#include "linux/hdreg.h"
+#include "linux/init.h"
+#include "linux/devfs_fs_kernel.h"
+#include "linux/cdrom.h"
+#include "linux/proc_fs.h"
+#include "linux/ctype.h"
+#include "linux/capability.h"
+#include "linux/mm.h"
+#include "linux/vmalloc.h"
+#include "linux/blkpg.h"
+#include "linux/genhd.h"
+#include "linux/spinlock.h"
+#include "asm/segment.h"
+#include "asm/uaccess.h"
+#include "asm/irq.h"
+#include "asm/types.h"
+#include "asm/tlbflush.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "kern_util.h"
+#include "kern.h"
+#include "mconsole_kern.h"
+#include "init.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+#include "ubd_user.h"
+#include "2_5compat.h"
+#include "os.h"
+#include "mem.h"
+#include "mem_kern.h"
+#include "cow.h"
+
+enum ubd_req { UBD_READ, UBD_WRITE, UBD_MMAP };
+
+struct io_thread_req {
+	enum ubd_req op;
+	int fds[2];
+	unsigned long offsets[2];
+	unsigned long long offset;
+	unsigned long length;
+	char *buffer;
+	int sectorsize;
+	unsigned long sector_mask;
+	unsigned long long cow_offset;
+	unsigned long bitmap_words[2];
+	int map_fd;
+	unsigned long long map_offset;
+	int error;
+};
+
+extern int open_ubd_file(char *file, struct openflags *openflags,
+			 char **backing_file_out, int *bitmap_offset_out,
+			 unsigned long *bitmap_len_out, int *data_offset_out,
+			 int *create_cow_out);
+extern int create_cow_file(char *cow_file, char *backing_file,
+			   struct openflags flags, int sectorsize,
+			   int alignment, int *bitmap_offset_out,
+			   unsigned long *bitmap_len_out,
+			   int *data_offset_out);
+extern int read_cow_bitmap(int fd, void *buf, int offset, int len);
+extern void do_io(struct io_thread_req *req);
+
+static inline int ubd_test_bit(__u64 bit, unsigned char *data)
+{
+	__u64 n;
+	int bits, off;
+
+	bits = sizeof(data[0]) * 8;
+	n = bit / bits;
+	off = bit % bits;
+	return((data[n] & (1 << off)) != 0);
+}
+
+static inline void ubd_set_bit(__u64 bit, unsigned char *data)
+{
+	__u64 n;
+	int bits, off;
+
+	bits = sizeof(data[0]) * 8;
+	n = bit / bits;
+	off = bit % bits;
+	data[n] |= (1 << off);
+}
+/*End stuff from ubd_user.h*/
+
+#define DRIVER_NAME "uml-blkdev"
+
+static DEFINE_SPINLOCK(ubd_io_lock);
+static DEFINE_SPINLOCK(ubd_lock);
+
+static void (*do_ubd)(void);
+
+static int ubd_open(struct inode * inode, struct file * filp);
+static int ubd_release(struct inode * inode, struct file * file);
+static int ubd_ioctl(struct inode * inode, struct file * file,
+		     unsigned int cmd, unsigned long arg);
+
+#define MAX_DEV (8)
+
+/* Changed in early boot */
+static int ubd_do_mmap = 0;
+#define UBD_MMAP_BLOCK_SIZE PAGE_SIZE
+
+static struct block_device_operations ubd_blops = {
+        .owner		= THIS_MODULE,
+        .open		= ubd_open,
+        .release	= ubd_release,
+        .ioctl		= ubd_ioctl,
+};
+
+/* Protected by the queue_lock */
+static request_queue_t *ubd_queue;
+
+/* Protected by ubd_lock */
+static int fake_major = MAJOR_NR;
+
+static struct gendisk *ubd_gendisk[MAX_DEV];
+static struct gendisk *fake_gendisk[MAX_DEV];
+ 
+#ifdef CONFIG_BLK_DEV_UBD_SYNC
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 1, .c = 0, \
+					 .cl = 1 })
+#else
+#define OPEN_FLAGS ((struct openflags) { .r = 1, .w = 1, .s = 0, .c = 0, \
+					 .cl = 1 })
+#endif
+
+/* Not protected - changed only in ubd_setup_common and then only to
+ * to enable O_SYNC.
+ */
+static struct openflags global_openflags = OPEN_FLAGS;
+
+struct cow {
+	char *file;
+	int fd;
+	unsigned long *bitmap;
+	unsigned long bitmap_len;
+	int bitmap_offset;
+        int data_offset;
+};
+
+struct ubd {
+	char *file;
+	int count;
+	int fd;
+	__u64 size;
+	struct openflags boot_openflags;
+	struct openflags openflags;
+	int no_cow;
+	struct cow cow;
+	struct platform_device pdev;
+
+	int map_writes;
+	int map_reads;
+	int nomap_writes;
+	int nomap_reads;
+	int write_maps;
+};
+
+#define DEFAULT_COW { \
+	.file =			NULL, \
+        .fd =			-1, \
+        .bitmap =		NULL, \
+	.bitmap_offset =	0, \
+        .data_offset =		0, \
+}
+
+#define DEFAULT_UBD { \
+	.file = 		NULL, \
+	.count =		0, \
+	.fd =			-1, \
+	.size =			-1, \
+	.boot_openflags =	OPEN_FLAGS, \
+	.openflags =		OPEN_FLAGS, \
+        .no_cow =               0, \
+        .cow =			DEFAULT_COW, \
+	.map_writes		= 0, \
+	.map_reads		= 0, \
+	.nomap_writes		= 0, \
+	.nomap_reads		= 0, \
+	.write_maps		= 0, \
+}
+
+struct ubd ubd_dev[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
+
+static int ubd0_init(void)
+{
+	struct ubd *dev = &ubd_dev[0];
+
+	if(dev->file == NULL)
+		dev->file = "root_fs";
+	return(0);
+}
+
+__initcall(ubd0_init);
+
+/* Only changed by fake_ide_setup which is a setup */
+static int fake_ide = 0;
+static struct proc_dir_entry *proc_ide_root = NULL;
+static struct proc_dir_entry *proc_ide = NULL;
+
+static void make_proc_ide(void)
+{
+	proc_ide_root = proc_mkdir("ide", NULL);
+	proc_ide = proc_mkdir("ide0", proc_ide_root);
+}
+
+static int proc_ide_read_media(char *page, char **start, off_t off, int count,
+			       int *eof, void *data)
+{
+	int len;
+
+	strcpy(page, "disk\n");
+	len = strlen("disk\n");
+	len -= off;
+	if (len < count){
+		*eof = 1;
+		if (len <= 0) return 0;
+	}
+	else len = count;
+	*start = page + off;
+	return len;
+}
+
+static void make_ide_entries(char *dev_name)
+{
+	struct proc_dir_entry *dir, *ent;
+	char name[64];
+
+	if(proc_ide_root == NULL) make_proc_ide();
+
+	dir = proc_mkdir(dev_name, proc_ide);
+	if(!dir) return;
+
+	ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir);
+	if(!ent) return;
+	ent->nlink = 1;
+	ent->data = NULL;
+	ent->read_proc = proc_ide_read_media;
+	ent->write_proc = NULL;
+	sprintf(name,"ide0/%s", dev_name);
+	proc_symlink(dev_name, proc_ide_root, name);
+}
+
+static int fake_ide_setup(char *str)
+{
+	fake_ide = 1;
+	return(1);
+}
+
+__setup("fake_ide", fake_ide_setup);
+
+__uml_help(fake_ide_setup,
+"fake_ide\n"
+"    Create ide0 entries that map onto ubd devices.\n\n"
+);
+
+static int parse_unit(char **ptr)
+{
+	char *str = *ptr, *end;
+	int n = -1;
+
+	if(isdigit(*str)) {
+		n = simple_strtoul(str, &end, 0);
+		if(end == str)
+			return(-1);
+		*ptr = end;
+	}
+	else if (('a' <= *str) && (*str <= 'h')) {
+		n = *str - 'a';
+		str++;
+		*ptr = str;
+	}
+	return(n);
+}
+
+static int ubd_setup_common(char *str, int *index_out)
+{
+	struct ubd *dev;
+	struct openflags flags = global_openflags;
+	char *backing_file;
+	int n, err, i;
+
+	if(index_out) *index_out = -1;
+	n = *str;
+	if(n == '='){
+		char *end;
+		int major;
+
+		str++;
+		if(!strcmp(str, "mmap")){
+			CHOOSE_MODE(printk("mmap not supported by the ubd "
+					   "driver in tt mode\n"),
+				    ubd_do_mmap = 1);
+			return(0);
+		}
+
+		if(!strcmp(str, "sync")){
+			global_openflags = of_sync(global_openflags);
+			return(0);
+		}
+		major = simple_strtoul(str, &end, 0);
+		if((*end != '\0') || (end == str)){
+			printk(KERN_ERR 
+			       "ubd_setup : didn't parse major number\n");
+			return(1);
+		}
+
+		err = 1;
+ 		spin_lock(&ubd_lock);
+ 		if(fake_major != MAJOR_NR){
+ 			printk(KERN_ERR "Can't assign a fake major twice\n");
+ 			goto out1;
+ 		}
+ 
+ 		fake_major = major;
+
+		printk(KERN_INFO "Setting extra ubd major number to %d\n",
+		       major);
+ 		err = 0;
+ 	out1:
+ 		spin_unlock(&ubd_lock);
+		return(err);
+	}
+
+	n = parse_unit(&str);
+	if(n < 0){
+		printk(KERN_ERR "ubd_setup : couldn't parse unit number "
+		       "'%s'\n", str);
+		return(1);
+	}
+	if(n >= MAX_DEV){
+		printk(KERN_ERR "ubd_setup : index %d out of range "
+		       "(%d devices, from 0 to %d)\n", n, MAX_DEV, MAX_DEV - 1);
+		return(1);
+	}
+
+	err = 1;
+	spin_lock(&ubd_lock);
+
+	dev = &ubd_dev[n];
+	if(dev->file != NULL){
+		printk(KERN_ERR "ubd_setup : device already configured\n");
+		goto out;
+	}
+
+	if (index_out)
+		*index_out = n;
+
+	for (i = 0; i < 4; i++) {
+		switch (*str) {
+		case 'r':
+			flags.w = 0;
+			break;
+		case 's':
+			flags.s = 1;
+			break;
+		case 'd':
+			dev->no_cow = 1;
+			break;
+		case '=':
+			str++;
+			goto break_loop;
+		default:
+			printk(KERN_ERR "ubd_setup : Expected '=' or flag letter (r,s or d)\n");
+			goto out;
+		}
+		str++;
+	}
+
+        if (*str == '=')
+		printk(KERN_ERR "ubd_setup : Too many flags specified\n");
+        else
+		printk(KERN_ERR "ubd_setup : Expected '='\n");
+	goto out;
+
+break_loop:
+	err = 0;
+	backing_file = strchr(str, ',');
+
+	if (!backing_file) {
+		backing_file = strchr(str, ':');
+	}
+
+	if(backing_file){
+		if(dev->no_cow)
+			printk(KERN_ERR "Can't specify both 'd' and a "
+			       "cow file\n");
+		else {
+			*backing_file = '\0';
+			backing_file++;
+		}
+	}
+	dev->file = str;
+	dev->cow.file = backing_file;
+	dev->boot_openflags = flags;
+out:
+	spin_unlock(&ubd_lock);
+	return(err);
+}
+
+static int ubd_setup(char *str)
+{
+	ubd_setup_common(str, NULL);
+	return(1);
+}
+
+__setup("ubd", ubd_setup);
+__uml_help(ubd_setup,
+"ubd<n><flags>=<filename>[(:|,)<filename2>]\n"
+"    This is used to associate a device with a file in the underlying\n"
+"    filesystem. When specifying two filenames, the first one is the\n"
+"    COW name and the second is the backing file name. As separator you can\n"
+"    use either a ':' or a ',': the first one allows writing things like;\n"
+"	ubd0=~/Uml/root_cow:~/Uml/root_backing_file\n"
+"    while with a ',' the shell would not expand the 2nd '~'.\n"
+"    When using only one filename, UML will detect whether to thread it like\n"
+"    a COW file or a backing file. To override this detection, add the 'd'\n"
+"    flag:\n"
+"	ubd0d=BackingFile\n"
+"    Usually, there is a filesystem in the file, but \n"
+"    that's not required. Swap devices containing swap files can be\n"
+"    specified like this. Also, a file which doesn't contain a\n"
+"    filesystem can have its contents read in the virtual \n"
+"    machine by running 'dd' on the device. <n> must be in the range\n"
+"    0 to 7. Appending an 'r' to the number will cause that device\n"
+"    to be mounted read-only. For example ubd1r=./ext_fs. Appending\n"
+"    an 's' will cause data to be written to disk on the host immediately.\n\n"
+);
+
+static int udb_setup(char *str)
+{
+	printk("udb%s specified on command line is almost certainly a ubd -> "
+	       "udb TYPO\n", str);
+	return(1);
+}
+
+__setup("udb", udb_setup);
+__uml_help(udb_setup,
+"udb\n"
+"    This option is here solely to catch ubd -> udb typos, which can be\n\n"
+"    to impossible to catch visually unless you specifically look for\n\n"
+"    them.  The only result of any option starting with 'udb' is an error\n\n"
+"    in the boot output.\n\n"
+);
+
+static int fakehd_set = 0;
+static int fakehd(char *str)
+{
+	printk(KERN_INFO "fakehd : Changing ubd name to \"hd\".\n");
+	fakehd_set = 1;
+	return 1;
+}
+
+__setup("fakehd", fakehd);
+__uml_help(fakehd,
+"fakehd\n"
+"    Change the ubd device name to \"hd\".\n\n"
+);
+
+static void do_ubd_request(request_queue_t * q);
+
+/* Only changed by ubd_init, which is an initcall. */
+int thread_fd = -1;
+
+/* Changed by ubd_handler, which is serialized because interrupts only
+ * happen on CPU 0.
+ */
+int intr_count = 0;
+
+/* call ubd_finish if you need to serialize */
+static void __ubd_finish(struct request *req, int error)
+{
+	int nsect;
+
+	if(error){
+		end_request(req, 0);
+		return;
+	}
+	nsect = req->current_nr_sectors;
+	req->sector += nsect;
+	req->buffer += nsect << 9;
+	req->errors = 0;
+	req->nr_sectors -= nsect;
+	req->current_nr_sectors = 0;
+	end_request(req, 1);
+}
+
+static inline void ubd_finish(struct request *req, int error)
+{
+ 	spin_lock(&ubd_io_lock);
+	__ubd_finish(req, error);
+	spin_unlock(&ubd_io_lock);
+}
+
+/* Called without ubd_io_lock held */
+static void ubd_handler(void)
+{
+	struct io_thread_req req;
+	struct request *rq = elv_next_request(ubd_queue);
+	int n, err;
+
+	do_ubd = NULL;
+	intr_count++;
+	n = os_read_file(thread_fd, &req, sizeof(req));
+	if(n != sizeof(req)){
+		printk(KERN_ERR "Pid %d - spurious interrupt in ubd_handler, "
+		       "err = %d\n", os_getpid(), -n);
+		spin_lock(&ubd_io_lock);
+		end_request(rq, 0);
+		spin_unlock(&ubd_io_lock);
+		return;
+	}
+        
+	if((req.op != UBD_MMAP) &&
+	   ((req.offset != ((__u64) (rq->sector)) << 9) ||
+	    (req.length != (rq->current_nr_sectors) << 9)))
+		panic("I/O op mismatch");
+	
+	if(req.map_fd != -1){
+		err = physmem_subst_mapping(req.buffer, req.map_fd,
+					    req.map_offset, 1);
+		if(err)
+			printk("ubd_handler - physmem_subst_mapping failed, "
+			       "err = %d\n", -err);
+	}
+
+	ubd_finish(rq, req.error);
+	reactivate_fd(thread_fd, UBD_IRQ);	
+	do_ubd_request(ubd_queue);
+}
+
+static irqreturn_t ubd_intr(int irq, void *dev, struct pt_regs *unused)
+{
+	ubd_handler();
+	return(IRQ_HANDLED);
+}
+
+/* Only changed by ubd_init, which is an initcall. */
+static int io_pid = -1;
+
+void kill_io_thread(void)
+{
+	if(io_pid != -1) 
+		os_kill_process(io_pid, 1);
+}
+
+__uml_exitcall(kill_io_thread);
+
+static int ubd_file_size(struct ubd *dev, __u64 *size_out)
+{
+	char *file;
+
+	file = dev->cow.file ? dev->cow.file : dev->file;
+	return(os_file_size(file, size_out));
+}
+
+static void ubd_close(struct ubd *dev)
+{
+	if(ubd_do_mmap)
+		physmem_forget_descriptor(dev->fd);
+	os_close_file(dev->fd);
+	if(dev->cow.file == NULL)
+		return;
+
+	if(ubd_do_mmap)
+		physmem_forget_descriptor(dev->cow.fd);
+	os_close_file(dev->cow.fd);
+	vfree(dev->cow.bitmap);
+	dev->cow.bitmap = NULL;
+}
+
+static int ubd_open_dev(struct ubd *dev)
+{
+	struct openflags flags;
+	char **back_ptr;
+	int err, create_cow, *create_ptr;
+
+	dev->openflags = dev->boot_openflags;
+	create_cow = 0;
+	create_ptr = (dev->cow.file != NULL) ? &create_cow : NULL;
+	back_ptr = dev->no_cow ? NULL : &dev->cow.file;
+	dev->fd = open_ubd_file(dev->file, &dev->openflags, back_ptr,
+				&dev->cow.bitmap_offset, &dev->cow.bitmap_len, 
+				&dev->cow.data_offset, create_ptr);
+
+	if((dev->fd == -ENOENT) && create_cow){
+		dev->fd = create_cow_file(dev->file, dev->cow.file, 
+					  dev->openflags, 1 << 9, PAGE_SIZE,
+					  &dev->cow.bitmap_offset, 
+					  &dev->cow.bitmap_len,
+					  &dev->cow.data_offset);
+		if(dev->fd >= 0){
+			printk(KERN_INFO "Creating \"%s\" as COW file for "
+			       "\"%s\"\n", dev->file, dev->cow.file);
+		}
+	}
+
+	if(dev->fd < 0){
+		printk("Failed to open '%s', errno = %d\n", dev->file,
+		       -dev->fd);
+		return(dev->fd);
+	}
+
+	if(dev->cow.file != NULL){
+		err = -ENOMEM;
+		dev->cow.bitmap = (void *) vmalloc(dev->cow.bitmap_len);
+		if(dev->cow.bitmap == NULL){
+			printk(KERN_ERR "Failed to vmalloc COW bitmap\n");
+			goto error;
+		}
+		flush_tlb_kernel_vm();
+
+		err = read_cow_bitmap(dev->fd, dev->cow.bitmap, 
+				      dev->cow.bitmap_offset, 
+				      dev->cow.bitmap_len);
+		if(err < 0)
+			goto error;
+
+		flags = dev->openflags;
+		flags.w = 0;
+		err = open_ubd_file(dev->cow.file, &flags, NULL, NULL, NULL, 
+				    NULL, NULL);
+		if(err < 0) goto error;
+		dev->cow.fd = err;
+	}
+	return(0);
+ error:
+	os_close_file(dev->fd);
+	return(err);
+}
+
+static int ubd_new_disk(int major, u64 size, int unit,
+			struct gendisk **disk_out)
+			
+{
+	struct gendisk *disk;
+	char from[sizeof("ubd/nnnnn\0")], to[sizeof("discnnnnn/disc\0")];
+	int err;
+
+	disk = alloc_disk(1 << UBD_SHIFT);
+	if(disk == NULL)
+		return(-ENOMEM);
+
+	disk->major = major;
+	disk->first_minor = unit << UBD_SHIFT;
+	disk->fops = &ubd_blops;
+	set_capacity(disk, size / 512);
+	if(major == MAJOR_NR){
+		sprintf(disk->disk_name, "ubd%c", 'a' + unit);
+		sprintf(disk->devfs_name, "ubd/disc%d", unit);
+		sprintf(from, "ubd/%d", unit);
+		sprintf(to, "disc%d/disc", unit);
+		err = devfs_mk_symlink(from, to);
+		if(err)
+			printk("ubd_new_disk failed to make link from %s to "
+			       "%s, error = %d\n", from, to, err);
+	}
+	else {
+		sprintf(disk->disk_name, "ubd_fake%d", unit);
+		sprintf(disk->devfs_name, "ubd_fake/disc%d", unit);
+	}
+
+	/* sysfs register (not for ide fake devices) */
+	if (major == MAJOR_NR) {
+		ubd_dev[unit].pdev.id   = unit;
+		ubd_dev[unit].pdev.name = DRIVER_NAME;
+		platform_device_register(&ubd_dev[unit].pdev);
+		disk->driverfs_dev = &ubd_dev[unit].pdev.dev;
+	}
+
+	disk->private_data = &ubd_dev[unit];
+	disk->queue = ubd_queue;
+	add_disk(disk);
+
+	*disk_out = disk;
+	return 0;
+}
+
+#define ROUND_BLOCK(n) ((n + ((1 << 9) - 1)) & (-1 << 9))
+
+static int ubd_add(int n)
+{
+	struct ubd *dev = &ubd_dev[n];
+	int err;
+
+	if(dev->file == NULL)
+		return(-ENODEV);
+
+	if (ubd_open_dev(dev))
+		return(-ENODEV);
+
+	err = ubd_file_size(dev, &dev->size);
+	if(err < 0)
+		return(err);
+
+	dev->size = ROUND_BLOCK(dev->size);
+
+	err = ubd_new_disk(MAJOR_NR, dev->size, n, &ubd_gendisk[n]);
+	if(err) 
+		return(err);
+ 
+	if(fake_major != MAJOR_NR)
+		ubd_new_disk(fake_major, dev->size, n, 
+			     &fake_gendisk[n]);
+
+	/* perhaps this should also be under the "if (fake_major)" above */
+	/* using the fake_disk->disk_name and also the fakehd_set name */
+	if (fake_ide)
+		make_ide_entries(ubd_gendisk[n]->disk_name);
+
+	ubd_close(dev);
+	return 0;
+}
+
+static int ubd_config(char *str)
+{
+	int n, err;
+
+	str = uml_strdup(str);
+	if(str == NULL){
+		printk(KERN_ERR "ubd_config failed to strdup string\n");
+		return(1);
+	}
+	err = ubd_setup_common(str, &n);
+	if(err){
+		kfree(str);
+		return(-1);
+	}
+	if(n == -1) return(0);
+
+ 	spin_lock(&ubd_lock);
+	err = ubd_add(n);
+	if(err)
+		ubd_dev[n].file = NULL;
+ 	spin_unlock(&ubd_lock);
+
+	return(err);
+}
+
+static int ubd_get_config(char *name, char *str, int size, char **error_out)
+{
+	struct ubd *dev;
+	int n, len = 0;
+
+	n = parse_unit(&name);
+	if((n >= MAX_DEV) || (n < 0)){
+		*error_out = "ubd_get_config : device number out of range";
+		return(-1);
+	}
+
+	dev = &ubd_dev[n];
+	spin_lock(&ubd_lock);
+
+	if(dev->file == NULL){
+		CONFIG_CHUNK(str, size, len, "", 1);
+		goto out;
+	}
+
+	CONFIG_CHUNK(str, size, len, dev->file, 0);
+
+	if(dev->cow.file != NULL){
+		CONFIG_CHUNK(str, size, len, ",", 0);
+		CONFIG_CHUNK(str, size, len, dev->cow.file, 1);
+	}
+	else CONFIG_CHUNK(str, size, len, "", 1);
+
+ out:
+	spin_unlock(&ubd_lock);
+	return(len);
+}
+
+static int ubd_remove(char *str)
+{
+	struct ubd *dev;
+	int n, err = -ENODEV;
+
+	n = parse_unit(&str);
+
+	if((n < 0) || (n >= MAX_DEV))
+		return(err);
+
+	dev = &ubd_dev[n];
+	if(dev->count > 0)
+		return(-EBUSY);	/* you cannot remove a open disk */
+
+	err = 0;
+ 	spin_lock(&ubd_lock);
+
+	if(ubd_gendisk[n] == NULL)
+		goto out;
+
+	del_gendisk(ubd_gendisk[n]);
+	put_disk(ubd_gendisk[n]);
+	ubd_gendisk[n] = NULL;
+
+	if(fake_gendisk[n] != NULL){
+		del_gendisk(fake_gendisk[n]);
+		put_disk(fake_gendisk[n]);
+		fake_gendisk[n] = NULL;
+	}
+
+	platform_device_unregister(&dev->pdev);
+	*dev = ((struct ubd) DEFAULT_UBD);
+	err = 0;
+ out:
+ 	spin_unlock(&ubd_lock);
+	return(err);
+}
+
+static struct mc_device ubd_mc = {
+	.name		= "ubd",
+	.config		= ubd_config,
+ 	.get_config	= ubd_get_config,
+	.remove		= ubd_remove,
+};
+
+static int ubd_mc_init(void)
+{
+	mconsole_register_dev(&ubd_mc);
+	return 0;
+}
+
+__initcall(ubd_mc_init);
+
+static struct device_driver ubd_driver = {
+	.name  = DRIVER_NAME,
+	.bus   = &platform_bus_type,
+};
+
+int ubd_init(void)
+{
+        int i;
+
+	devfs_mk_dir("ubd");
+	if (register_blkdev(MAJOR_NR, "ubd"))
+		return -1;
+
+	ubd_queue = blk_init_queue(do_ubd_request, &ubd_io_lock);
+	if (!ubd_queue) {
+		unregister_blkdev(MAJOR_NR, "ubd");
+		return -1;
+	}
+		
+	if (fake_major != MAJOR_NR) {
+		char name[sizeof("ubd_nnn\0")];
+
+		snprintf(name, sizeof(name), "ubd_%d", fake_major);
+		devfs_mk_dir(name);
+		if (register_blkdev(fake_major, "ubd"))
+			return -1;
+	}
+	driver_register(&ubd_driver);
+	for (i = 0; i < MAX_DEV; i++) 
+		ubd_add(i);
+	return 0;
+}
+
+late_initcall(ubd_init);
+
+int ubd_driver_init(void){
+	unsigned long stack;
+	int err;
+
+	/* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
+	if(global_openflags.s){
+		printk(KERN_INFO "ubd: Synchronous mode\n");
+		/* Letting ubd=sync be like using ubd#s= instead of ubd#= is
+		 * enough. So use anyway the io thread. */
+	}
+	stack = alloc_stack(0, 0);
+	io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), 
+				 &thread_fd);
+	if(io_pid < 0){
+		printk(KERN_ERR 
+		       "ubd : Failed to start I/O thread (errno = %d) - "
+		       "falling back to synchronous I/O\n", -io_pid);
+		io_pid = -1;
+		return(0);
+	}
+	err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, 
+			     SA_INTERRUPT, "ubd", ubd_dev);
+	if(err != 0)
+		printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
+	return(err);
+}
+
+device_initcall(ubd_driver_init);
+
+static int ubd_open(struct inode *inode, struct file *filp)
+{
+	struct gendisk *disk = inode->i_bdev->bd_disk;
+	struct ubd *dev = disk->private_data;
+	int err = 0;
+
+	if(dev->count == 0){
+		err = ubd_open_dev(dev);
+		if(err){
+			printk(KERN_ERR "%s: Can't open \"%s\": errno = %d\n",
+			       disk->disk_name, dev->file, -err);
+			goto out;
+		}
+	}
+	dev->count++;
+	if((filp->f_mode & FMODE_WRITE) && !dev->openflags.w){
+	        if(--dev->count == 0) ubd_close(dev);
+	        err = -EROFS;
+	}
+ out:
+	return(err);
+}
+
+static int ubd_release(struct inode * inode, struct file * file)
+{
+	struct gendisk *disk = inode->i_bdev->bd_disk;
+	struct ubd *dev = disk->private_data;
+
+	if(--dev->count == 0)
+		ubd_close(dev);
+	return(0);
+}
+
+static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
+			  __u64 *cow_offset, unsigned long *bitmap,
+			  __u64 bitmap_offset, unsigned long *bitmap_words,
+			  __u64 bitmap_len)
+{
+	__u64 sector = io_offset >> 9;
+	int i, update_bitmap = 0;
+
+	for(i = 0; i < length >> 9; i++){
+		if(cow_mask != NULL)
+			ubd_set_bit(i, (unsigned char *) cow_mask);
+		if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+			continue;
+
+		update_bitmap = 1;
+		ubd_set_bit(sector + i, (unsigned char *) bitmap);
+	}
+
+	if(!update_bitmap)
+		return;
+
+	*cow_offset = sector / (sizeof(unsigned long) * 8);
+
+	/* This takes care of the case where we're exactly at the end of the
+	 * device, and *cow_offset + 1 is off the end.  So, just back it up
+	 * by one word.  Thanks to Lynn Kerby for the fix and James McMechan
+	 * for the original diagnosis.
+	 */
+	if(*cow_offset == ((bitmap_len + sizeof(unsigned long) - 1) /
+			   sizeof(unsigned long) - 1))
+		(*cow_offset)--;
+
+	bitmap_words[0] = bitmap[*cow_offset];
+	bitmap_words[1] = bitmap[*cow_offset + 1];
+
+	*cow_offset *= sizeof(unsigned long);
+	*cow_offset += bitmap_offset;
+}
+
+static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
+		       __u64 bitmap_offset, __u64 bitmap_len)
+{
+	__u64 sector = req->offset >> 9;
+	int i;
+
+	if(req->length > (sizeof(req->sector_mask) * 8) << 9)
+		panic("Operation too long");
+
+	if(req->op == UBD_READ) {
+		for(i = 0; i < req->length >> 9; i++){
+			if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
+				ubd_set_bit(i, (unsigned char *) 
+					    &req->sector_mask);
+                }
+	}
+	else cowify_bitmap(req->offset, req->length, &req->sector_mask,
+			   &req->cow_offset, bitmap, bitmap_offset,
+			   req->bitmap_words, bitmap_len);
+}
+
+static int mmap_fd(struct request *req, struct ubd *dev, __u64 offset)
+{
+	__u64 sector;
+	unsigned char *bitmap;
+	int bit, i;
+
+	/* mmap must have been requested on the command line */
+	if(!ubd_do_mmap)
+		return(-1);
+
+	/* The buffer must be page aligned */
+	if(((unsigned long) req->buffer % UBD_MMAP_BLOCK_SIZE) != 0)
+		return(-1);
+
+	/* The request must be a page long */
+	if((req->current_nr_sectors << 9) != PAGE_SIZE)
+		return(-1);
+
+	if(dev->cow.file == NULL)
+		return(dev->fd);
+
+	sector = offset >> 9;
+	bitmap = (unsigned char *) dev->cow.bitmap;
+	bit = ubd_test_bit(sector, bitmap);
+
+	for(i = 1; i < req->current_nr_sectors; i++){
+		if(ubd_test_bit(sector + i, bitmap) != bit)
+			return(-1);
+	}
+
+	if(bit || (rq_data_dir(req) == WRITE))
+		offset += dev->cow.data_offset;
+
+	/* The data on disk must be page aligned */
+	if((offset % UBD_MMAP_BLOCK_SIZE) != 0)
+		return(-1);
+
+	return(bit ? dev->fd : dev->cow.fd);
+}
+
+static int prepare_mmap_request(struct ubd *dev, int fd, __u64 offset,
+				struct request *req,
+				struct io_thread_req *io_req)
+{
+	int err;
+
+	if(rq_data_dir(req) == WRITE){
+		/* Writes are almost no-ops since the new data is already in the
+		 * host page cache
+		 */
+		dev->map_writes++;
+		if(dev->cow.file != NULL)
+			cowify_bitmap(io_req->offset, io_req->length,
+				      &io_req->sector_mask, &io_req->cow_offset,
+				      dev->cow.bitmap, dev->cow.bitmap_offset,
+				      io_req->bitmap_words,
+				      dev->cow.bitmap_len);
+	}
+	else {
+		int w;
+
+		if((dev->cow.file != NULL) && (fd == dev->cow.fd))
+			w = 0;
+		else w = dev->openflags.w;
+
+		if((dev->cow.file != NULL) && (fd == dev->fd))
+			offset += dev->cow.data_offset;
+
+		err = physmem_subst_mapping(req->buffer, fd, offset, w);
+		if(err){
+			printk("physmem_subst_mapping failed, err = %d\n",
+			       -err);
+			return(1);
+		}
+		dev->map_reads++;
+	}
+	io_req->op = UBD_MMAP;
+	io_req->buffer = req->buffer;
+	return(0);
+}
+
+/* Called with ubd_io_lock held */
+static int prepare_request(struct request *req, struct io_thread_req *io_req)
+{
+	struct gendisk *disk = req->rq_disk;
+	struct ubd *dev = disk->private_data;
+	__u64 offset;
+	int len, fd;
+
+	if(req->rq_status == RQ_INACTIVE) return(1);
+
+	if((rq_data_dir(req) == WRITE) && !dev->openflags.w){
+		printk("Write attempted on readonly ubd device %s\n", 
+		       disk->disk_name);
+		end_request(req, 0);
+		return(1);
+	}
+
+	offset = ((__u64) req->sector) << 9;
+	len = req->current_nr_sectors << 9;
+
+	io_req->fds[0] = (dev->cow.file != NULL) ? dev->cow.fd : dev->fd;
+	io_req->fds[1] = dev->fd;
+	io_req->map_fd = -1;
+	io_req->cow_offset = -1;
+	io_req->offset = offset;
+	io_req->length = len;
+	io_req->error = 0;
+	io_req->sector_mask = 0;
+
+	fd = mmap_fd(req, dev, io_req->offset);
+	if(fd > 0){
+		/* If mmapping is otherwise OK, but the first access to the
+		 * page is a write, then it's not mapped in yet.  So we have
+		 * to write the data to disk first, then we can map the disk
+		 * page in and continue normally from there.
+		 */
+		if((rq_data_dir(req) == WRITE) && !is_remapped(req->buffer)){
+			io_req->map_fd = dev->fd;
+			io_req->map_offset = io_req->offset +
+				dev->cow.data_offset;
+			dev->write_maps++;
+		}
+		else return(prepare_mmap_request(dev, fd, io_req->offset, req,
+						 io_req));
+	}
+
+	if(rq_data_dir(req) == READ)
+		dev->nomap_reads++;
+	else dev->nomap_writes++;
+
+	io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
+	io_req->offsets[0] = 0;
+	io_req->offsets[1] = dev->cow.data_offset;
+	io_req->buffer = req->buffer;
+	io_req->sectorsize = 1 << 9;
+
+	if(dev->cow.file != NULL)
+		cowify_req(io_req, dev->cow.bitmap, dev->cow.bitmap_offset,
+			   dev->cow.bitmap_len);
+
+	return(0);
+}
+
+/* Called with ubd_io_lock held */
+static void do_ubd_request(request_queue_t *q)
+{
+	struct io_thread_req io_req;
+	struct request *req;
+	int err, n;
+
+	if(thread_fd == -1){
+		while((req = elv_next_request(q)) != NULL){
+			err = prepare_request(req, &io_req);
+			if(!err){
+				do_io(&io_req);
+				__ubd_finish(req, io_req.error);
+			}
+		}
+	}
+	else {
+		if(do_ubd || (req = elv_next_request(q)) == NULL)
+			return;
+		err = prepare_request(req, &io_req);
+		if(!err){
+			do_ubd = ubd_handler;
+			n = os_write_file(thread_fd, (char *) &io_req,
+					 sizeof(io_req));
+			if(n != sizeof(io_req))
+				printk("write to io thread failed, "
+				       "errno = %d\n", -n);
+		}
+	}
+}
+
+static int ubd_ioctl(struct inode * inode, struct file * file,
+		     unsigned int cmd, unsigned long arg)
+{
+	struct hd_geometry __user *loc = (struct hd_geometry __user *) arg;
+	struct ubd *dev = inode->i_bdev->bd_disk->private_data;
+	struct hd_driveid ubd_id = {
+		.cyls		= 0,
+		.heads		= 128,
+		.sectors	= 32,
+	};
+
+	switch (cmd) {
+	        struct hd_geometry g;
+		struct cdrom_volctrl volume;
+	case HDIO_GETGEO:
+		if(!loc) return(-EINVAL);
+		g.heads = 128;
+		g.sectors = 32;
+		g.cylinders = dev->size / (128 * 32 * 512);
+		g.start = get_start_sect(inode->i_bdev);
+		return(copy_to_user(loc, &g, sizeof(g)) ? -EFAULT : 0);
+
+	case HDIO_GET_IDENTITY:
+		ubd_id.cyls = dev->size / (128 * 32 * 512);
+		if(copy_to_user((char __user *) arg, (char *) &ubd_id,
+				 sizeof(ubd_id)))
+			return(-EFAULT);
+		return(0);
+		
+	case CDROMVOLREAD:
+		if(copy_from_user(&volume, (char __user *) arg, sizeof(volume)))
+			return(-EFAULT);
+		volume.channel0 = 255;
+		volume.channel1 = 255;
+		volume.channel2 = 255;
+		volume.channel3 = 255;
+		if(copy_to_user((char __user *) arg, &volume, sizeof(volume)))
+			return(-EFAULT);
+		return(0);
+	}
+	return(-EINVAL);
+}
+
+static int ubd_check_remapped(int fd, unsigned long address, int is_write,
+			      __u64 offset)
+{
+	__u64 bitmap_offset;
+	unsigned long new_bitmap[2];
+	int i, err, n;
+
+	/* If it's not a write access, we can't do anything about it */
+	if(!is_write)
+		return(0);
+
+	/* We have a write */
+	for(i = 0; i < sizeof(ubd_dev) / sizeof(ubd_dev[0]); i++){
+		struct ubd *dev = &ubd_dev[i];
+
+		if((dev->fd != fd) && (dev->cow.fd != fd))
+			continue;
+
+		/* It's a write to a ubd device */
+
+		if(!dev->openflags.w){
+			/* It's a write access on a read-only device - probably
+			 * shouldn't happen.  If the kernel is trying to change
+			 * something with no intention of writing it back out,
+			 * then this message will clue us in that this needs
+			 * fixing
+			 */
+			printk("Write access to mapped page from readonly ubd "
+			       "device %d\n", i);
+			return(0);
+		}
+
+		/* It's a write to a writeable ubd device - it must be COWed
+		 * because, otherwise, the page would have been mapped in
+		 * writeable
+		 */
+
+		if(!dev->cow.file)
+			panic("Write fault on writeable non-COW ubd device %d",
+			      i);
+
+		/* It should also be an access to the backing file since the
+		 * COW pages should be mapped in read-write
+		 */
+
+		if(fd == dev->fd)
+			panic("Write fault on a backing page of ubd "
+			      "device %d\n", i);
+
+		/* So, we do the write, copying the backing data to the COW
+		 * file...
+		 */
+
+		err = os_seek_file(dev->fd, offset + dev->cow.data_offset);
+		if(err < 0)
+			panic("Couldn't seek to %lld in COW file of ubd "
+			      "device %d, err = %d",
+			      offset + dev->cow.data_offset, i, -err);
+
+		n = os_write_file(dev->fd, (void *) address, PAGE_SIZE);
+		if(n != PAGE_SIZE)
+			panic("Couldn't copy data to COW file of ubd "
+			      "device %d, err = %d", i, -n);
+
+		/* ... updating the COW bitmap... */
+
+		cowify_bitmap(offset, PAGE_SIZE, NULL, &bitmap_offset,
+			      dev->cow.bitmap, dev->cow.bitmap_offset,
+			      new_bitmap, dev->cow.bitmap_len);
+
+		err = os_seek_file(dev->fd, bitmap_offset);
+		if(err < 0)
+			panic("Couldn't seek to %lld in COW file of ubd "
+			      "device %d, err = %d", bitmap_offset, i, -err);
+
+		n = os_write_file(dev->fd, new_bitmap, sizeof(new_bitmap));
+		if(n != sizeof(new_bitmap))
+			panic("Couldn't update bitmap  of ubd device %d, "
+			      "err = %d", i, -n);
+
+		/* Maybe we can map the COW page in, and maybe we can't.  If
+		 * it is a pre-V3 COW file, we can't, since the alignment will
+		 * be wrong.  If it is a V3 or later COW file which has been
+		 * moved to a system with a larger page size, then maybe we
+		 * can't, depending on the exact location of the page.
+		 */
+
+		offset += dev->cow.data_offset;
+
+		/* Remove the remapping, putting the original anonymous page
+		 * back.  If the COW file can be mapped in, that is done.
+		 * Otherwise, the COW page is read in.
+		 */
+
+		if(!physmem_remove_mapping((void *) address))
+			panic("Address 0x%lx not remapped by ubd device %d",
+			      address, i);
+		if((offset % UBD_MMAP_BLOCK_SIZE) == 0)
+			physmem_subst_mapping((void *) address, dev->fd,
+					      offset, 1);
+		else {
+			err = os_seek_file(dev->fd, offset);
+			if(err < 0)
+				panic("Couldn't seek to %lld in COW file of "
+				      "ubd device %d, err = %d", offset, i,
+				      -err);
+
+			n = os_read_file(dev->fd, (void *) address, PAGE_SIZE);
+			if(n != PAGE_SIZE)
+				panic("Failed to read page from offset %llx of "
+				      "COW file of ubd device %d, err = %d",
+				      offset, i, -n);
+		}
+
+		return(1);
+	}
+
+	/* It's not a write on a ubd device */
+	return(0);
+}
+
+static struct remapper ubd_remapper = {
+	.list	= LIST_HEAD_INIT(ubd_remapper.list),
+	.proc	= ubd_check_remapped,
+};
+
+static int ubd_remapper_setup(void)
+{
+	if(ubd_do_mmap)
+		register_remapper(&ubd_remapper);
+
+	return(0);
+}
+
+__initcall(ubd_remapper_setup);
+
+static int same_backing_files(char *from_cmdline, char *from_cow, char *cow)
+{
+	struct uml_stat buf1, buf2;
+	int err;
+
+	if(from_cmdline == NULL) return(1);
+	if(!strcmp(from_cmdline, from_cow)) return(1);
+
+	err = os_stat_file(from_cmdline, &buf1);
+	if(err < 0){
+		printk("Couldn't stat '%s', err = %d\n", from_cmdline, -err);
+		return(1);
+	}
+	err = os_stat_file(from_cow, &buf2);
+	if(err < 0){
+		printk("Couldn't stat '%s', err = %d\n", from_cow, -err);
+		return(1);
+	}
+	if((buf1.ust_dev == buf2.ust_dev) && (buf1.ust_ino == buf2.ust_ino))
+		return(1);
+
+	printk("Backing file mismatch - \"%s\" requested,\n"
+	       "\"%s\" specified in COW header of \"%s\"\n",
+	       from_cmdline, from_cow, cow);
+	return(0);
+}
+
+static int backing_file_mismatch(char *file, __u64 size, time_t mtime)
+{
+	unsigned long modtime;
+	long long actual;
+	int err;
+
+	err = os_file_modtime(file, &modtime);
+	if(err < 0){
+		printk("Failed to get modification time of backing file "
+		       "\"%s\", err = %d\n", file, -err);
+		return(err);
+	}
+
+	err = os_file_size(file, &actual);
+	if(err < 0){
+		printk("Failed to get size of backing file \"%s\", "
+		       "err = %d\n", file, -err);
+		return(err);
+	}
+
+  	if(actual != size){
+		/*__u64 can be a long on AMD64 and with %lu GCC complains; so
+		 * the typecast.*/
+		printk("Size mismatch (%llu vs %llu) of COW header vs backing "
+		       "file\n", (unsigned long long) size, actual);
+		return(-EINVAL);
+	}
+	if(modtime != mtime){
+		printk("mtime mismatch (%ld vs %ld) of COW header vs backing "
+		       "file\n", mtime, modtime);
+		return(-EINVAL);
+	}
+	return(0);
+}
+
+int read_cow_bitmap(int fd, void *buf, int offset, int len)
+{
+	int err;
+
+	err = os_seek_file(fd, offset);
+	if(err < 0)
+		return(err);
+
+	err = os_read_file(fd, buf, len);
+	if(err < 0)
+		return(err);
+
+	return(0);
+}
+
+int open_ubd_file(char *file, struct openflags *openflags,
+		  char **backing_file_out, int *bitmap_offset_out,
+		  unsigned long *bitmap_len_out, int *data_offset_out,
+		  int *create_cow_out)
+{
+	time_t mtime;
+	unsigned long long size;
+	__u32 version, align;
+	char *backing_file;
+	int fd, err, sectorsize, same, mode = 0644;
+
+	fd = os_open_file(file, *openflags, mode);
+	if(fd < 0){
+		if((fd == -ENOENT) && (create_cow_out != NULL))
+			*create_cow_out = 1;
+                if(!openflags->w ||
+                   ((fd != -EROFS) && (fd != -EACCES))) return(fd);
+		openflags->w = 0;
+		fd = os_open_file(file, *openflags, mode);
+		if(fd < 0)
+			return(fd);
+        }
+
+	err = os_lock_file(fd, openflags->w);
+	if(err < 0){
+		printk("Failed to lock '%s', err = %d\n", file, -err);
+		goto out_close;
+	}
+
+	if(backing_file_out == NULL) return(fd);
+
+	err = read_cow_header(file_reader, &fd, &version, &backing_file, &mtime,
+			      &size, &sectorsize, &align, bitmap_offset_out);
+	if(err && (*backing_file_out != NULL)){
+		printk("Failed to read COW header from COW file \"%s\", "
+		       "errno = %d\n", file, -err);
+		goto out_close;
+	}
+	if(err) return(fd);
+
+	if(backing_file_out == NULL) return(fd);
+
+	same = same_backing_files(*backing_file_out, backing_file, file);
+
+	if(!same && !backing_file_mismatch(*backing_file_out, size, mtime)){
+		printk("Switching backing file to '%s'\n", *backing_file_out);
+		err = write_cow_header(file, fd, *backing_file_out,
+				       sectorsize, align, &size);
+		if(err){
+			printk("Switch failed, errno = %d\n", -err);
+			return(err);
+		}
+	}
+	else {
+		*backing_file_out = backing_file;
+		err = backing_file_mismatch(*backing_file_out, size, mtime);
+		if(err) goto out_close;
+	}
+
+	cow_sizes(version, size, sectorsize, align, *bitmap_offset_out,
+		  bitmap_len_out, data_offset_out);
+
+        return(fd);
+ out_close:
+	os_close_file(fd);
+	return(err);
+}
+
+int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
+		    int sectorsize, int alignment, int *bitmap_offset_out,
+		    unsigned long *bitmap_len_out, int *data_offset_out)
+{
+	int err, fd;
+
+	flags.c = 1;
+	fd = open_ubd_file(cow_file, &flags, NULL, NULL, NULL, NULL, NULL);
+	if(fd < 0){
+		err = fd;
+		printk("Open of COW file '%s' failed, errno = %d\n", cow_file,
+		       -err);
+		goto out;
+	}
+
+	err = init_cow_file(fd, cow_file, backing_file, sectorsize, alignment,
+			    bitmap_offset_out, bitmap_len_out,
+			    data_offset_out);
+	if(!err)
+		return(fd);
+	os_close_file(fd);
+ out:
+	return(err);
+}
+
+static int update_bitmap(struct io_thread_req *req)
+{
+	int n;
+
+	if(req->cow_offset == -1)
+		return(0);
+
+	n = os_seek_file(req->fds[1], req->cow_offset);
+	if(n < 0){
+		printk("do_io - bitmap lseek failed : err = %d\n", -n);
+		return(1);
+	}
+
+	n = os_write_file(req->fds[1], &req->bitmap_words,
+		          sizeof(req->bitmap_words));
+	if(n != sizeof(req->bitmap_words)){
+		printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
+		       req->fds[1]);
+		return(1);
+	}
+
+	return(0);
+}
+
+void do_io(struct io_thread_req *req)
+{
+	char *buf;
+	unsigned long len;
+	int n, nsectors, start, end, bit;
+	int err;
+	__u64 off;
+
+	if(req->op == UBD_MMAP){
+		/* Touch the page to force the host to do any necessary IO to
+		 * get it into memory
+		 */
+		n = *((volatile int *) req->buffer);
+		req->error = update_bitmap(req);
+		return;
+	}
+
+	nsectors = req->length / req->sectorsize;
+	start = 0;
+	do {
+		bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask);
+		end = start;
+		while((end < nsectors) &&
+		      (ubd_test_bit(end, (unsigned char *)
+				    &req->sector_mask) == bit))
+			end++;
+
+		off = req->offset + req->offsets[bit] +
+			start * req->sectorsize;
+		len = (end - start) * req->sectorsize;
+		buf = &req->buffer[start * req->sectorsize];
+
+		err = os_seek_file(req->fds[bit], off);
+		if(err < 0){
+			printk("do_io - lseek failed : err = %d\n", -err);
+			req->error = 1;
+			return;
+		}
+		if(req->op == UBD_READ){
+			n = 0;
+			do {
+				buf = &buf[n];
+				len -= n;
+				n = os_read_file(req->fds[bit], buf, len);
+				if (n < 0) {
+					printk("do_io - read failed, err = %d "
+					       "fd = %d\n", -n, req->fds[bit]);
+					req->error = 1;
+					return;
+				}
+			} while((n < len) && (n != 0));
+			if (n < len) memset(&buf[n], 0, len - n);
+		}
+		else {
+			n = os_write_file(req->fds[bit], buf, len);
+			if(n != len){
+				printk("do_io - write failed err = %d "
+				       "fd = %d\n", -n, req->fds[bit]);
+				req->error = 1;
+				return;
+			}
+		}
+
+		start = end;
+	} while(start < nsectors);
+
+	req->error = update_bitmap(req);
+}
+
+/* Changed in start_io_thread, which is serialized by being called only
+ * from ubd_init, which is an initcall.
+ */
+int kernel_fd = -1;
+
+/* Only changed by the io thread */
+int io_count = 0;
+
+int io_thread(void *arg)
+{
+	struct io_thread_req req;
+	int n;
+
+	ignore_sigwinch_sig();
+	while(1){
+		n = os_read_file(kernel_fd, &req, sizeof(req));
+		if(n != sizeof(req)){
+			if(n < 0)
+				printk("io_thread - read failed, fd = %d, "
+				       "err = %d\n", kernel_fd, -n);
+			else {
+				printk("io_thread - short read, fd = %d, "
+				       "length = %d\n", kernel_fd, n);
+			}
+			continue;
+		}
+		io_count++;
+		do_io(&req);
+		n = os_write_file(kernel_fd, &req, sizeof(req));
+		if(n != sizeof(req))
+			printk("io_thread - write failed, fd = %d, err = %d\n",
+			       kernel_fd, -n);
+	}
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/ubd_user.c b/arch/um/drivers/ubd_user.c
new file mode 100644
index 00000000000..b94d2bc4fe0
--- /dev/null
+++ b/arch/um/drivers/ubd_user.c
@@ -0,0 +1,75 @@
+/* 
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 Ridgerun,Inc (glonnon@ridgerun.com)
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <string.h>
+#include <netinet/in.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include "asm/types.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "ubd_user.h"
+#include "os.h"
+#include "cow.h"
+
+#include <endian.h>
+#include <byteswap.h>
+
+void ignore_sigwinch_sig(void)
+{
+	signal(SIGWINCH, SIG_IGN);
+}
+
+int start_io_thread(unsigned long sp, int *fd_out)
+{
+	int pid, fds[2], err;
+
+	err = os_pipe(fds, 1, 1);
+	if(err < 0){
+		printk("start_io_thread - os_pipe failed, err = %d\n", -err);
+		goto out;
+	}
+
+	kernel_fd = fds[0];
+	*fd_out = fds[1];
+
+	pid = clone(io_thread, (void *) sp, CLONE_FILES | CLONE_VM | SIGCHLD,
+		    NULL);
+	if(pid < 0){
+		printk("start_io_thread - clone failed : errno = %d\n", errno);
+		err = -errno;
+		goto out_close;
+	}
+
+	return(pid);
+
+ out_close:
+	os_close_file(fds[0]);
+	os_close_file(fds[1]);
+	kernel_fd = -1;
+	*fd_out = -1;
+ out:
+	return(err);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/xterm.c b/arch/um/drivers/xterm.c
new file mode 100644
index 00000000000..93dc1911363
--- /dev/null
+++ b/arch/um/drivers/xterm.c
@@ -0,0 +1,225 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <termios.h>
+#include <signal.h>
+#include <sched.h>
+#include <sys/socket.h>
+#include "kern_util.h"
+#include "chan_user.h"
+#include "helper.h"
+#include "user_util.h"
+#include "user.h"
+#include "os.h"
+#include "xterm.h"
+
+struct xterm_chan {
+	int pid;
+	int helper_pid;
+	char *title;
+	int device;
+	int raw;
+	struct termios tt;
+	unsigned long stack;
+	int direct_rcv;
+};
+
+/* Not static because it's called directly by the tt mode gdb code */
+void *xterm_init(char *str, int device, struct chan_opts *opts)
+{
+	struct xterm_chan *data;
+
+	data = malloc(sizeof(*data));
+	if(data == NULL) return(NULL);
+	*data = ((struct xterm_chan) { .pid 		= -1, 
+				       .helper_pid 	= -1,
+				       .device 		= device, 
+				       .title 		= opts->xterm_title,
+				       .raw  		= opts->raw,
+				       .stack 		= opts->tramp_stack,
+				       .direct_rcv 	= !opts->in_kernel } );
+	return(data);
+}
+
+/* Only changed by xterm_setup, which is a setup */
+static char *terminal_emulator = "xterm";
+static char *title_switch = "-T";
+static char *exec_switch = "-e";
+
+static int __init xterm_setup(char *line, int *add)
+{
+	*add = 0;
+	terminal_emulator = line;
+
+	line = strchr(line, ',');
+	if(line == NULL) return(0);
+	*line++ = '\0';
+	if(*line) title_switch = line;
+
+	line = strchr(line, ',');
+	if(line == NULL) return(0);
+	*line++ = '\0';
+	if(*line) exec_switch = line;
+
+	return(0);
+}
+
+__uml_setup("xterm=", xterm_setup,
+"xterm=<terminal emulator>,<title switch>,<exec switch>\n"
+"    Specifies an alternate terminal emulator to use for the debugger,\n"
+"    consoles, and serial lines when they are attached to the xterm channel.\n"
+"    The values are the terminal emulator binary, the switch it uses to set\n"
+"    its title, and the switch it uses to execute a subprocess,\n"
+"    respectively.  The title switch must have the form '<switch> title',\n"
+"    not '<switch>=title'.  Similarly, the exec switch must have the form\n"
+"    '<switch> command arg1 arg2 ...'.\n"
+"    The default values are 'xterm=xterm,-T,-e'.  Values for gnome-terminal\n"
+"    are 'xterm=gnome-terminal,-t,-x'.\n\n"
+);
+
+/* XXX This badly needs some cleaning up in the error paths
+ * Not static because it's called directly by the tt mode gdb code
+ */
+int xterm_open(int input, int output, int primary, void *d,
+		      char **dev_out)
+{
+	struct xterm_chan *data = d;
+	unsigned long stack;
+	int pid, fd, new, err;
+	char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
+	char *argv[] = { terminal_emulator, title_switch, title, exec_switch, 
+			 "/usr/lib/uml/port-helper", "-uml-socket",
+			 file, NULL };
+
+	if(os_access(argv[4], OS_ACC_X_OK) < 0)
+		argv[4] = "port-helper";
+
+	/* Check that DISPLAY is set, this doesn't guarantee the xterm
+	 * will work but w/o it we can be pretty sure it won't. */
+	if (!getenv("DISPLAY")) {
+		printk("xterm_open: $DISPLAY not set.\n");
+		return -ENODEV;
+	}
+
+	fd = mkstemp(file);
+	if(fd < 0){
+		printk("xterm_open : mkstemp failed, errno = %d\n", errno);
+		return(-errno);
+	}
+
+	if(unlink(file)){
+		printk("xterm_open : unlink failed, errno = %d\n", errno);
+		return(-errno);
+	}
+	os_close_file(fd);
+
+	fd = os_create_unix_socket(file, sizeof(file), 1);
+	if(fd < 0){
+		printk("xterm_open : create_unix_socket failed, errno = %d\n", 
+		       -fd);
+		return(fd);
+	}
+
+	sprintf(title, data->title, data->device);
+	stack = data->stack;
+	pid = run_helper(NULL, NULL, argv, &stack);
+	if(pid < 0){
+		printk("xterm_open : run_helper failed, errno = %d\n", -pid);
+		return(pid);
+	}
+
+	if(data->stack == 0) free_stack(stack, 0);
+
+	if (data->direct_rcv) {
+		new = os_rcv_fd(fd, &data->helper_pid);
+	} else {
+		err = os_set_fd_block(fd, 0);
+		if(err < 0){
+			printk("xterm_open : failed to set descriptor "
+			       "non-blocking, err = %d\n", -err);
+			return(err);
+		}
+		new = xterm_fd(fd, &data->helper_pid);
+	}
+	if(new < 0){
+		printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
+		goto out;
+	}
+
+	CATCH_EINTR(err = tcgetattr(new, &data->tt));
+	if(err){
+		new = err;
+		goto out;
+	}
+
+	if(data->raw){
+		err = raw(new);
+		if(err){
+			new = err;
+			goto out;
+		}
+	}
+
+	data->pid = pid;
+	*dev_out = NULL;
+ out:
+	unlink(file);
+	return(new);
+}
+
+/* Not static because it's called directly by the tt mode gdb code */
+void xterm_close(int fd, void *d)
+{
+	struct xterm_chan *data = d;
+	
+	if(data->pid != -1) 
+		os_kill_process(data->pid, 1);
+	data->pid = -1;
+	if(data->helper_pid != -1) 
+		os_kill_process(data->helper_pid, 0);
+	data->helper_pid = -1;
+	os_close_file(fd);
+}
+
+static void xterm_free(void *d)
+{
+	free(d);
+}
+
+static int xterm_console_write(int fd, const char *buf, int n, void *d)
+{
+	struct xterm_chan *data = d;
+
+	return(generic_console_write(fd, buf, n, &data->tt));
+}
+
+struct chan_ops xterm_ops = {
+	.type		= "xterm",
+	.init		= xterm_init,
+	.open		= xterm_open,
+	.close		= xterm_close,
+	.read		= generic_read,
+	.write		= generic_write,
+	.console_write	= xterm_console_write,
+	.window_size	= generic_window_size,
+	.free		= xterm_free,
+	.winch		= 1,
+};
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/xterm.h b/arch/um/drivers/xterm.h
new file mode 100644
index 00000000000..f33a6e77b18
--- /dev/null
+++ b/arch/um/drivers/xterm.h
@@ -0,0 +1,22 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __XTERM_H__
+#define __XTERM_H__
+
+extern int xterm_fd(int socket, int *pid_out);
+
+#endif
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
new file mode 100644
index 00000000000..7917b9d1cec
--- /dev/null
+++ b/arch/um/drivers/xterm_kern.c
@@ -0,0 +1,93 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/errno.h"
+#include "linux/slab.h"
+#include "linux/signal.h"
+#include "linux/interrupt.h"
+#include "asm/semaphore.h"
+#include "asm/irq.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+#include "kern_util.h"
+#include "os.h"
+#include "xterm.h"
+
+struct xterm_wait {
+	struct completion ready;
+	int fd;
+	int pid;
+	int new_fd;
+};
+
+static irqreturn_t xterm_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+	struct xterm_wait *xterm = data;
+	int fd;
+
+	fd = os_rcv_fd(xterm->fd, &xterm->pid);
+	if(fd == -EAGAIN)
+		return(IRQ_NONE);
+
+	xterm->new_fd = fd;
+	complete(&xterm->ready);
+	return(IRQ_HANDLED);
+}
+
+int xterm_fd(int socket, int *pid_out)
+{
+	struct xterm_wait *data;
+	int err, ret;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if(data == NULL){
+		printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
+		return(-ENOMEM);
+	}
+
+	/* This is a locked semaphore... */
+	*data = ((struct xterm_wait) 
+		{ .fd 		= socket,
+		  .pid 		= -1,
+		  .new_fd 	= -1 });
+	init_completion(&data->ready);
+
+	err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 
+			     SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+			     "xterm", data);
+	if (err){
+		printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
+		       "err = %d\n",  err);
+		ret = err;
+		goto out;
+	}
+
+	/* ... so here we wait for an xterm interrupt.
+	 *
+	 * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
+	 * isn't set) this will hang... */
+	wait_for_completion(&data->ready);
+
+	free_irq_by_irq_and_dev(XTERM_IRQ, data);
+	free_irq(XTERM_IRQ, data);
+
+	ret = data->new_fd;
+	*pid_out = data->pid;
+ out:
+	kfree(data);
+
+	return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */