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authorPaul Mackerras <paulus@samba.org>2005-11-18 15:43:34 +1100
committerPaul Mackerras <paulus@samba.org>2005-11-18 15:43:34 +1100
commit437a58db57c61385baaa1cb8b7fa590b6a2f1607 (patch)
tree3b25862dccdfd891b0d8582ff7b98b1db9f197f7 /arch/ppc64/kernel
parentf62859bb6871c5e4a8e591c60befc8caaf54db8c (diff)
powerpc: Move remaining .c files from arch/ppc64 to arch/powerpc
This also deletes the now-unused Makefiles under arch/ppc64. Both of the files moved over could use some merging, but for now I have moved them as-is and arranged for them to be used only in 64-bit kernels. For 32-bit kernels we still use arch/ppc/kernel/idle.c and drivers/char/generic_nvram.c as before. Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/ppc64/kernel')
-rw-r--r--arch/ppc64/kernel/Makefile7
-rw-r--r--arch/ppc64/kernel/idle.c121
-rw-r--r--arch/ppc64/kernel/nvram.c742
3 files changed, 0 insertions, 870 deletions
diff --git a/arch/ppc64/kernel/Makefile b/arch/ppc64/kernel/Makefile
deleted file mode 100644
index 5f0abdb66e0..00000000000
--- a/arch/ppc64/kernel/Makefile
+++ /dev/null
@@ -1,7 +0,0 @@
-#
-# Makefile for the linux ppc64 kernel.
-#
-
-obj-y += idle.o
-
-obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o
diff --git a/arch/ppc64/kernel/idle.c b/arch/ppc64/kernel/idle.c
deleted file mode 100644
index b879d3057ef..00000000000
--- a/arch/ppc64/kernel/idle.c
+++ /dev/null
@@ -1,121 +0,0 @@
-/*
- * Idle daemon for PowerPC. Idle daemon will handle any action
- * that needs to be taken when the system becomes idle.
- *
- * Originally Written by Cort Dougan (cort@cs.nmt.edu)
- *
- * iSeries supported added by Mike Corrigan <mikejc@us.ibm.com>
- *
- * Additional shared processor, SMT, and firmware support
- * Copyright (c) 2003 Dave Engebretsen <engebret@us.ibm.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.
- */
-
-#include <linux/config.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/smp.h>
-#include <linux/cpu.h>
-#include <linux/sysctl.h>
-
-#include <asm/system.h>
-#include <asm/processor.h>
-#include <asm/cputable.h>
-#include <asm/time.h>
-#include <asm/machdep.h>
-#include <asm/smp.h>
-
-extern void power4_idle(void);
-
-void default_idle(void)
-{
- unsigned int cpu = smp_processor_id();
- set_thread_flag(TIF_POLLING_NRFLAG);
-
- while (1) {
- if (!need_resched()) {
- while (!need_resched() && !cpu_is_offline(cpu)) {
- ppc64_runlatch_off();
-
- /*
- * Go into low thread priority and possibly
- * low power mode.
- */
- HMT_low();
- HMT_very_low();
- }
-
- HMT_medium();
- }
-
- ppc64_runlatch_on();
- preempt_enable_no_resched();
- schedule();
- preempt_disable();
- if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
- cpu_die();
- }
-}
-
-void native_idle(void)
-{
- while (1) {
- ppc64_runlatch_off();
-
- if (!need_resched())
- power4_idle();
-
- if (need_resched()) {
- ppc64_runlatch_on();
- preempt_enable_no_resched();
- schedule();
- preempt_disable();
- }
-
- if (cpu_is_offline(smp_processor_id()) &&
- system_state == SYSTEM_RUNNING)
- cpu_die();
- }
-}
-
-void cpu_idle(void)
-{
- BUG_ON(NULL == ppc_md.idle_loop);
- ppc_md.idle_loop();
-}
-
-int powersave_nap;
-
-#ifdef CONFIG_SYSCTL
-/*
- * Register the sysctl to set/clear powersave_nap.
- */
-static ctl_table powersave_nap_ctl_table[]={
- {
- .ctl_name = KERN_PPC_POWERSAVE_NAP,
- .procname = "powersave-nap",
- .data = &powersave_nap,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = &proc_dointvec,
- },
- { 0, },
-};
-static ctl_table powersave_nap_sysctl_root[] = {
- { 1, "kernel", NULL, 0, 0755, powersave_nap_ctl_table, },
- { 0,},
-};
-
-static int __init
-register_powersave_nap_sysctl(void)
-{
- register_sysctl_table(powersave_nap_sysctl_root, 0);
-
- return 0;
-}
-__initcall(register_powersave_nap_sysctl);
-#endif
diff --git a/arch/ppc64/kernel/nvram.c b/arch/ppc64/kernel/nvram.c
deleted file mode 100644
index c0fcd29918c..00000000000
--- a/arch/ppc64/kernel/nvram.c
+++ /dev/null
@@ -1,742 +0,0 @@
-/*
- * c 2001 PPC 64 Team, IBM Corp
- *
- * 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.
- *
- * /dev/nvram driver for PPC64
- *
- * This perhaps should live in drivers/char
- *
- * TODO: Split the /dev/nvram part (that one can use
- * drivers/char/generic_nvram.c) from the arch & partition
- * parsing code.
- */
-
-#include <linux/module.h>
-
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/fcntl.h>
-#include <linux/nvram.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <asm/uaccess.h>
-#include <asm/nvram.h>
-#include <asm/rtas.h>
-#include <asm/prom.h>
-#include <asm/machdep.h>
-
-#undef DEBUG_NVRAM
-
-static int nvram_scan_partitions(void);
-static int nvram_setup_partition(void);
-static int nvram_create_os_partition(void);
-static int nvram_remove_os_partition(void);
-
-static struct nvram_partition * nvram_part;
-static long nvram_error_log_index = -1;
-static long nvram_error_log_size = 0;
-
-int no_logging = 1; /* Until we initialize everything,
- * make sure we don't try logging
- * anything */
-
-extern volatile int error_log_cnt;
-
-struct err_log_info {
- int error_type;
- unsigned int seq_num;
-};
-
-static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
-{
- int size;
-
- if (ppc_md.nvram_size == NULL)
- return -ENODEV;
- size = ppc_md.nvram_size();
-
- switch (origin) {
- case 1:
- offset += file->f_pos;
- break;
- case 2:
- offset += size;
- break;
- }
- if (offset < 0)
- return -EINVAL;
- file->f_pos = offset;
- return file->f_pos;
-}
-
-
-static ssize_t dev_nvram_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- ssize_t len;
- char *tmp_buffer;
- int size;
-
- if (ppc_md.nvram_size == NULL)
- return -ENODEV;
- size = ppc_md.nvram_size();
-
- if (!access_ok(VERIFY_WRITE, buf, count))
- return -EFAULT;
- if (*ppos >= size)
- return 0;
- if (count > size)
- count = size;
-
- tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
- if (!tmp_buffer) {
- printk(KERN_ERR "dev_read_nvram: kmalloc failed\n");
- return -ENOMEM;
- }
-
- len = ppc_md.nvram_read(tmp_buffer, count, ppos);
- if ((long)len <= 0) {
- kfree(tmp_buffer);
- return len;
- }
-
- if (copy_to_user(buf, tmp_buffer, len)) {
- kfree(tmp_buffer);
- return -EFAULT;
- }
-
- kfree(tmp_buffer);
- return len;
-
-}
-
-static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- ssize_t len;
- char * tmp_buffer;
- int size;
-
- if (ppc_md.nvram_size == NULL)
- return -ENODEV;
- size = ppc_md.nvram_size();
-
- if (!access_ok(VERIFY_READ, buf, count))
- return -EFAULT;
- if (*ppos >= size)
- return 0;
- if (count > size)
- count = size;
-
- tmp_buffer = (char *) kmalloc(count, GFP_KERNEL);
- if (!tmp_buffer) {
- printk(KERN_ERR "dev_nvram_write: kmalloc failed\n");
- return -ENOMEM;
- }
-
- if (copy_from_user(tmp_buffer, buf, count)) {
- kfree(tmp_buffer);
- return -EFAULT;
- }
-
- len = ppc_md.nvram_write(tmp_buffer, count, ppos);
- if ((long)len <= 0) {
- kfree(tmp_buffer);
- return len;
- }
-
- kfree(tmp_buffer);
- return len;
-}
-
-static int dev_nvram_ioctl(struct inode *inode, struct file *file,
- unsigned int cmd, unsigned long arg)
-{
- switch(cmd) {
-#ifdef CONFIG_PPC_PMAC
- case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
- printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
- case IOC_NVRAM_GET_OFFSET: {
- int part, offset;
-
- if (_machine != PLATFORM_POWERMAC)
- return -EINVAL;
- if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
- return -EFAULT;
- if (part < pmac_nvram_OF || part > pmac_nvram_NR)
- return -EINVAL;
- offset = pmac_get_partition(part);
- if (offset < 0)
- return offset;
- if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
- return -EFAULT;
- return 0;
- }
-#endif /* CONFIG_PPC_PMAC */
- }
- return -EINVAL;
-}
-
-struct file_operations nvram_fops = {
- .owner = THIS_MODULE,
- .llseek = dev_nvram_llseek,
- .read = dev_nvram_read,
- .write = dev_nvram_write,
- .ioctl = dev_nvram_ioctl,
-};
-
-static struct miscdevice nvram_dev = {
- NVRAM_MINOR,
- "nvram",
- &nvram_fops
-};
-
-
-#ifdef DEBUG_NVRAM
-static void nvram_print_partitions(char * label)
-{
- struct list_head * p;
- struct nvram_partition * tmp_part;
-
- printk(KERN_WARNING "--------%s---------\n", label);
- printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
- list_for_each(p, &nvram_part->partition) {
- tmp_part = list_entry(p, struct nvram_partition, partition);
- printk(KERN_WARNING "%d \t%02x\t%02x\t%d\t%s\n",
- tmp_part->index, tmp_part->header.signature,
- tmp_part->header.checksum, tmp_part->header.length,
- tmp_part->header.name);
- }
-}
-#endif
-
-
-static int nvram_write_header(struct nvram_partition * part)
-{
- loff_t tmp_index;
- int rc;
-
- tmp_index = part->index;
- rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index);
-
- return rc;
-}
-
-
-static unsigned char nvram_checksum(struct nvram_header *p)
-{
- unsigned int c_sum, c_sum2;
- unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
- c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
-
- /* The sum may have spilled into the 3rd byte. Fold it back. */
- c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
- /* The sum cannot exceed 2 bytes. Fold it into a checksum */
- c_sum2 = (c_sum >> 8) + (c_sum << 8);
- c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
- return c_sum;
-}
-
-
-/*
- * Find an nvram partition, sig can be 0 for any
- * partition or name can be NULL for any name, else
- * tries to match both
- */
-struct nvram_partition *nvram_find_partition(int sig, const char *name)
-{
- struct nvram_partition * part;
- struct list_head * p;
-
- list_for_each(p, &nvram_part->partition) {
- part = list_entry(p, struct nvram_partition, partition);
-
- if (sig && part->header.signature != sig)
- continue;
- if (name && 0 != strncmp(name, part->header.name, 12))
- continue;
- return part;
- }
- return NULL;
-}
-EXPORT_SYMBOL(nvram_find_partition);
-
-
-static int nvram_remove_os_partition(void)
-{
- struct list_head *i;
- struct list_head *j;
- struct nvram_partition * part;
- struct nvram_partition * cur_part;
- int rc;
-
- list_for_each(i, &nvram_part->partition) {
- part = list_entry(i, struct nvram_partition, partition);
- if (part->header.signature != NVRAM_SIG_OS)
- continue;
-
- /* Make os partition a free partition */
- part->header.signature = NVRAM_SIG_FREE;
- sprintf(part->header.name, "wwwwwwwwwwww");
- part->header.checksum = nvram_checksum(&part->header);
-
- /* Merge contiguous free partitions backwards */
- list_for_each_prev(j, &part->partition) {
- cur_part = list_entry(j, struct nvram_partition, partition);
- if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
- break;
- }
-
- part->header.length += cur_part->header.length;
- part->header.checksum = nvram_checksum(&part->header);
- part->index = cur_part->index;
-
- list_del(&cur_part->partition);
- kfree(cur_part);
- j = &part->partition; /* fixup our loop */
- }
-
- /* Merge contiguous free partitions forwards */
- list_for_each(j, &part->partition) {
- cur_part = list_entry(j, struct nvram_partition, partition);
- if (cur_part == nvram_part || cur_part->header.signature != NVRAM_SIG_FREE) {
- break;
- }
-
- part->header.length += cur_part->header.length;
- part->header.checksum = nvram_checksum(&part->header);
-
- list_del(&cur_part->partition);
- kfree(cur_part);
- j = &part->partition; /* fixup our loop */
- }
-
- rc = nvram_write_header(part);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_remove_os_partition: nvram_write failed (%d)\n", rc);
- return rc;
- }
-
- }
-
- return 0;
-}
-
-/* nvram_create_os_partition
- *
- * Create a OS linux partition to buffer error logs.
- * Will create a partition starting at the first free
- * space found if space has enough room.
- */
-static int nvram_create_os_partition(void)
-{
- struct nvram_partition *part;
- struct nvram_partition *new_part;
- struct nvram_partition *free_part = NULL;
- int seq_init[2] = { 0, 0 };
- loff_t tmp_index;
- long size = 0;
- int rc;
-
- /* Find a free partition that will give us the maximum needed size
- If can't find one that will give us the minimum size needed */
- list_for_each_entry(part, &nvram_part->partition, partition) {
- if (part->header.signature != NVRAM_SIG_FREE)
- continue;
-
- if (part->header.length >= NVRAM_MAX_REQ) {
- size = NVRAM_MAX_REQ;
- free_part = part;
- break;
- }
- if (!size && part->header.length >= NVRAM_MIN_REQ) {
- size = NVRAM_MIN_REQ;
- free_part = part;
- }
- }
- if (!size)
- return -ENOSPC;
-
- /* Create our OS partition */
- new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
- if (!new_part) {
- printk(KERN_ERR "nvram_create_os_partition: kmalloc failed\n");
- return -ENOMEM;
- }
-
- new_part->index = free_part->index;
- new_part->header.signature = NVRAM_SIG_OS;
- new_part->header.length = size;
- strcpy(new_part->header.name, "ppc64,linux");
- new_part->header.checksum = nvram_checksum(&new_part->header);
-
- rc = nvram_write_header(new_part);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write_header \
- failed (%d)\n", rc);
- return rc;
- }
-
- /* make sure and initialize to zero the sequence number and the error
- type logged */
- tmp_index = new_part->index + NVRAM_HEADER_LEN;
- rc = ppc_md.nvram_write((char *)&seq_init, sizeof(seq_init), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write "
- "failed (%d)\n", rc);
- return rc;
- }
-
- nvram_error_log_index = new_part->index + NVRAM_HEADER_LEN;
- nvram_error_log_size = ((part->header.length - 1) *
- NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
-
- list_add_tail(&new_part->partition, &free_part->partition);
-
- if (free_part->header.length <= size) {
- list_del(&free_part->partition);
- kfree(free_part);
- return 0;
- }
-
- /* Adjust the partition we stole the space from */
- free_part->index += size * NVRAM_BLOCK_LEN;
- free_part->header.length -= size;
- free_part->header.checksum = nvram_checksum(&free_part->header);
-
- rc = nvram_write_header(free_part);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_create_os_partition: nvram_write_header "
- "failed (%d)\n", rc);
- return rc;
- }
-
- return 0;
-}
-
-
-/* nvram_setup_partition
- *
- * This will setup the partition we need for buffering the
- * error logs and cleanup partitions if needed.
- *
- * The general strategy is the following:
- * 1.) If there is ppc64,linux partition large enough then use it.
- * 2.) If there is not a ppc64,linux partition large enough, search
- * for a free partition that is large enough.
- * 3.) If there is not a free partition large enough remove
- * _all_ OS partitions and consolidate the space.
- * 4.) Will first try getting a chunk that will satisfy the maximum
- * error log size (NVRAM_MAX_REQ).
- * 5.) If the max chunk cannot be allocated then try finding a chunk
- * that will satisfy the minum needed (NVRAM_MIN_REQ).
- */
-static int nvram_setup_partition(void)
-{
- struct list_head * p;
- struct nvram_partition * part;
- int rc;
-
- /* For now, we don't do any of this on pmac, until I
- * have figured out if it's worth killing some unused stuffs
- * in our nvram, as Apple defined partitions use pretty much
- * all of the space
- */
- if (_machine == PLATFORM_POWERMAC)
- return -ENOSPC;
-
- /* see if we have an OS partition that meets our needs.
- will try getting the max we need. If not we'll delete
- partitions and try again. */
- list_for_each(p, &nvram_part->partition) {
- part = list_entry(p, struct nvram_partition, partition);
- if (part->header.signature != NVRAM_SIG_OS)
- continue;
-
- if (strcmp(part->header.name, "ppc64,linux"))
- continue;
-
- if (part->header.length >= NVRAM_MIN_REQ) {
- /* found our partition */
- nvram_error_log_index = part->index + NVRAM_HEADER_LEN;
- nvram_error_log_size = ((part->header.length - 1) *
- NVRAM_BLOCK_LEN) - sizeof(struct err_log_info);
- return 0;
- }
- }
-
- /* try creating a partition with the free space we have */
- rc = nvram_create_os_partition();
- if (!rc) {
- return 0;
- }
-
- /* need to free up some space */
- rc = nvram_remove_os_partition();
- if (rc) {
- return rc;
- }
-
- /* create a partition in this new space */
- rc = nvram_create_os_partition();
- if (rc) {
- printk(KERN_ERR "nvram_create_os_partition: Could not find a "
- "NVRAM partition large enough\n");
- return rc;
- }
-
- return 0;
-}
-
-
-static int nvram_scan_partitions(void)
-{
- loff_t cur_index = 0;
- struct nvram_header phead;
- struct nvram_partition * tmp_part;
- unsigned char c_sum;
- char * header;
- int total_size;
- int err;
-
- if (ppc_md.nvram_size == NULL)
- return -ENODEV;
- total_size = ppc_md.nvram_size();
-
- header = (char *) kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
- if (!header) {
- printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
- return -ENOMEM;
- }
-
- while (cur_index < total_size) {
-
- err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
- if (err != NVRAM_HEADER_LEN) {
- printk(KERN_ERR "nvram_scan_partitions: Error parsing "
- "nvram partitions\n");
- goto out;
- }
-
- cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
-
- memcpy(&phead, header, NVRAM_HEADER_LEN);
-
- err = 0;
- c_sum = nvram_checksum(&phead);
- if (c_sum != phead.checksum) {
- printk(KERN_WARNING "WARNING: nvram partition checksum"
- " was %02x, should be %02x!\n",
- phead.checksum, c_sum);
- printk(KERN_WARNING "Terminating nvram partition scan\n");
- goto out;
- }
- if (!phead.length) {
- printk(KERN_WARNING "WARNING: nvram corruption "
- "detected: 0-length partition\n");
- goto out;
- }
- tmp_part = (struct nvram_partition *)
- kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
- err = -ENOMEM;
- if (!tmp_part) {
- printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
- goto out;
- }
-
- memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
- tmp_part->index = cur_index;
- list_add_tail(&tmp_part->partition, &nvram_part->partition);
-
- cur_index += phead.length * NVRAM_BLOCK_LEN;
- }
- err = 0;
-
- out:
- kfree(header);
- return err;
-}
-
-static int __init nvram_init(void)
-{
- int error;
- int rc;
-
- if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
- return -ENODEV;
-
- rc = misc_register(&nvram_dev);
- if (rc != 0) {
- printk(KERN_ERR "nvram_init: failed to register device\n");
- return rc;
- }
-
- /* initialize our anchor for the nvram partition list */
- nvram_part = (struct nvram_partition *) kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
- if (!nvram_part) {
- printk(KERN_ERR "nvram_init: Failed kmalloc\n");
- return -ENOMEM;
- }
- INIT_LIST_HEAD(&nvram_part->partition);
-
- /* Get all the NVRAM partitions */
- error = nvram_scan_partitions();
- if (error) {
- printk(KERN_ERR "nvram_init: Failed nvram_scan_partitions\n");
- return error;
- }
-
- if(nvram_setup_partition())
- printk(KERN_WARNING "nvram_init: Could not find nvram partition"
- " for nvram buffered error logging.\n");
-
-#ifdef DEBUG_NVRAM
- nvram_print_partitions("NVRAM Partitions");
-#endif
-
- return rc;
-}
-
-void __exit nvram_cleanup(void)
-{
- misc_deregister( &nvram_dev );
-}
-
-
-#ifdef CONFIG_PPC_PSERIES
-
-/* nvram_write_error_log
- *
- * We need to buffer the error logs into nvram to ensure that we have
- * the failure information to decode. If we have a severe error there
- * is no way to guarantee that the OS or the machine is in a state to
- * get back to user land and write the error to disk. For example if
- * the SCSI device driver causes a Machine Check by writing to a bad
- * IO address, there is no way of guaranteeing that the device driver
- * is in any state that is would also be able to write the error data
- * captured to disk, thus we buffer it in NVRAM for analysis on the
- * next boot.
- *
- * In NVRAM the partition containing the error log buffer will looks like:
- * Header (in bytes):
- * +-----------+----------+--------+------------+------------------+
- * | signature | checksum | length | name | data |
- * |0 |1 |2 3|4 15|16 length-1|
- * +-----------+----------+--------+------------+------------------+
- *
- * The 'data' section would look like (in bytes):
- * +--------------+------------+-----------------------------------+
- * | event_logged | sequence # | error log |
- * |0 3|4 7|8 nvram_error_log_size-1|
- * +--------------+------------+-----------------------------------+
- *
- * event_logged: 0 if event has not been logged to syslog, 1 if it has
- * sequence #: The unique sequence # for each event. (until it wraps)
- * error log: The error log from event_scan
- */
-int nvram_write_error_log(char * buff, int length, unsigned int err_type)
-{
- int rc;
- loff_t tmp_index;
- struct err_log_info info;
-
- if (no_logging) {
- return -EPERM;
- }
-
- if (nvram_error_log_index == -1) {
- return -ESPIPE;
- }
-
- if (length > nvram_error_log_size) {
- length = nvram_error_log_size;
- }
-
- info.error_type = err_type;
- info.seq_num = error_log_cnt;
-
- tmp_index = nvram_error_log_index;
-
- rc = ppc_md.nvram_write((char *)&info, sizeof(struct err_log_info), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
- return rc;
- }
-
- rc = ppc_md.nvram_write(buff, length, &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_write_error_log: Failed nvram_write (%d)\n", rc);
- return rc;
- }
-
- return 0;
-}
-
-/* nvram_read_error_log
- *
- * Reads nvram for error log for at most 'length'
- */
-int nvram_read_error_log(char * buff, int length, unsigned int * err_type)
-{
- int rc;
- loff_t tmp_index;
- struct err_log_info info;
-
- if (nvram_error_log_index == -1)
- return -1;
-
- if (length > nvram_error_log_size)
- length = nvram_error_log_size;
-
- tmp_index = nvram_error_log_index;
-
- rc = ppc_md.nvram_read((char *)&info, sizeof(struct err_log_info), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
- return rc;
- }
-
- rc = ppc_md.nvram_read(buff, length, &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_read_error_log: Failed nvram_read (%d)\n", rc);
- return rc;
- }
-
- error_log_cnt = info.seq_num;
- *err_type = info.error_type;
-
- return 0;
-}
-
-/* This doesn't actually zero anything, but it sets the event_logged
- * word to tell that this event is safely in syslog.
- */
-int nvram_clear_error_log(void)
-{
- loff_t tmp_index;
- int clear_word = ERR_FLAG_ALREADY_LOGGED;
- int rc;
-
- tmp_index = nvram_error_log_index;
-
- rc = ppc_md.nvram_write((char *)&clear_word, sizeof(int), &tmp_index);
- if (rc <= 0) {
- printk(KERN_ERR "nvram_clear_error_log: Failed nvram_write (%d)\n", rc);
- return rc;
- }
-
- return 0;
-}
-
-#endif /* CONFIG_PPC_PSERIES */
-
-module_init(nvram_init);
-module_exit(nvram_cleanup);
-MODULE_LICENSE("GPL");