diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/i386/kernel/cpu/mtrr/if.c |
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!
Diffstat (limited to 'arch/i386/kernel/cpu/mtrr/if.c')
-rw-r--r-- | arch/i386/kernel/cpu/mtrr/if.c | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/arch/i386/kernel/cpu/mtrr/if.c b/arch/i386/kernel/cpu/mtrr/if.c new file mode 100644 index 00000000000..1923e0aed26 --- /dev/null +++ b/arch/i386/kernel/cpu/mtrr/if.c @@ -0,0 +1,374 @@ +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/ctype.h> +#include <linux/module.h> +#include <linux/seq_file.h> +#include <asm/uaccess.h> + +#define LINE_SIZE 80 + +#include <asm/mtrr.h> +#include "mtrr.h" + +/* RED-PEN: this is accessed without any locking */ +extern unsigned int *usage_table; + + +#define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private) + +static char *mtrr_strings[MTRR_NUM_TYPES] = +{ + "uncachable", /* 0 */ + "write-combining", /* 1 */ + "?", /* 2 */ + "?", /* 3 */ + "write-through", /* 4 */ + "write-protect", /* 5 */ + "write-back", /* 6 */ +}; + +char *mtrr_attrib_to_str(int x) +{ + return (x <= 6) ? mtrr_strings[x] : "?"; +} + +#ifdef CONFIG_PROC_FS + +static int +mtrr_file_add(unsigned long base, unsigned long size, + unsigned int type, char increment, struct file *file, int page) +{ + int reg, max; + unsigned int *fcount = FILE_FCOUNT(file); + + max = num_var_ranges; + if (fcount == NULL) { + fcount = kmalloc(max * sizeof *fcount, GFP_KERNEL); + if (!fcount) + return -ENOMEM; + memset(fcount, 0, max * sizeof *fcount); + FILE_FCOUNT(file) = fcount; + } + if (!page) { + if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) + return -EINVAL; + base >>= PAGE_SHIFT; + size >>= PAGE_SHIFT; + } + reg = mtrr_add_page(base, size, type, 1); + if (reg >= 0) + ++fcount[reg]; + return reg; +} + +static int +mtrr_file_del(unsigned long base, unsigned long size, + struct file *file, int page) +{ + int reg; + unsigned int *fcount = FILE_FCOUNT(file); + + if (!page) { + if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1))) + return -EINVAL; + base >>= PAGE_SHIFT; + size >>= PAGE_SHIFT; + } + reg = mtrr_del_page(-1, base, size); + if (reg < 0) + return reg; + if (fcount == NULL) + return reg; + if (fcount[reg] < 1) + return -EINVAL; + --fcount[reg]; + return reg; +} + +/* RED-PEN: seq_file can seek now. this is ignored. */ +static ssize_t +mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos) +/* Format of control line: + "base=%Lx size=%Lx type=%s" OR: + "disable=%d" +*/ +{ + int i, err; + unsigned long reg; + unsigned long long base, size; + char *ptr; + char line[LINE_SIZE]; + size_t linelen; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (!len) + return -EINVAL; + memset(line, 0, LINE_SIZE); + if (len > LINE_SIZE) + len = LINE_SIZE; + if (copy_from_user(line, buf, len - 1)) + return -EFAULT; + linelen = strlen(line); + ptr = line + linelen - 1; + if (linelen && *ptr == '\n') + *ptr = '\0'; + if (!strncmp(line, "disable=", 8)) { + reg = simple_strtoul(line + 8, &ptr, 0); + err = mtrr_del_page(reg, 0, 0); + if (err < 0) + return err; + return len; + } + if (strncmp(line, "base=", 5)) + return -EINVAL; + base = simple_strtoull(line + 5, &ptr, 0); + for (; isspace(*ptr); ++ptr) ; + if (strncmp(ptr, "size=", 5)) + return -EINVAL; + size = simple_strtoull(ptr + 5, &ptr, 0); + if ((base & 0xfff) || (size & 0xfff)) + return -EINVAL; + for (; isspace(*ptr); ++ptr) ; + if (strncmp(ptr, "type=", 5)) + return -EINVAL; + ptr += 5; + for (; isspace(*ptr); ++ptr) ; + for (i = 0; i < MTRR_NUM_TYPES; ++i) { + if (strcmp(ptr, mtrr_strings[i])) + continue; + base >>= PAGE_SHIFT; + size >>= PAGE_SHIFT; + err = + mtrr_add_page((unsigned long) base, (unsigned long) size, i, + 1); + if (err < 0) + return err; + return len; + } + return -EINVAL; +} + +static int +mtrr_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long __arg) +{ + int err; + mtrr_type type; + struct mtrr_sentry sentry; + struct mtrr_gentry gentry; + void __user *arg = (void __user *) __arg; + + switch (cmd) { + default: + return -ENOTTY; + case MTRRIOC_ADD_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = + mtrr_file_add(sentry.base, sentry.size, sentry.type, 1, + file, 0); + if (err < 0) + return err; + break; + case MTRRIOC_SET_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_add(sentry.base, sentry.size, sentry.type, 0); + if (err < 0) + return err; + break; + case MTRRIOC_DEL_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_file_del(sentry.base, sentry.size, file, 0); + if (err < 0) + return err; + break; + case MTRRIOC_KILL_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_del(-1, sentry.base, sentry.size); + if (err < 0) + return err; + break; + case MTRRIOC_GET_ENTRY: + if (copy_from_user(&gentry, arg, sizeof gentry)) + return -EFAULT; + if (gentry.regnum >= num_var_ranges) + return -EINVAL; + mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type); + + /* Hide entries that go above 4GB */ + if (gentry.base + gentry.size > 0x100000 + || gentry.size == 0x100000) + gentry.base = gentry.size = gentry.type = 0; + else { + gentry.base <<= PAGE_SHIFT; + gentry.size <<= PAGE_SHIFT; + gentry.type = type; + } + + if (copy_to_user(arg, &gentry, sizeof gentry)) + return -EFAULT; + break; + case MTRRIOC_ADD_PAGE_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = + mtrr_file_add(sentry.base, sentry.size, sentry.type, 1, + file, 1); + if (err < 0) + return err; + break; + case MTRRIOC_SET_PAGE_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0); + if (err < 0) + return err; + break; + case MTRRIOC_DEL_PAGE_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_file_del(sentry.base, sentry.size, file, 1); + if (err < 0) + return err; + break; + case MTRRIOC_KILL_PAGE_ENTRY: + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + if (copy_from_user(&sentry, arg, sizeof sentry)) + return -EFAULT; + err = mtrr_del_page(-1, sentry.base, sentry.size); + if (err < 0) + return err; + break; + case MTRRIOC_GET_PAGE_ENTRY: + if (copy_from_user(&gentry, arg, sizeof gentry)) + return -EFAULT; + if (gentry.regnum >= num_var_ranges) + return -EINVAL; + mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type); + gentry.type = type; + + if (copy_to_user(arg, &gentry, sizeof gentry)) + return -EFAULT; + break; + } + return 0; +} + +static int +mtrr_close(struct inode *ino, struct file *file) +{ + int i, max; + unsigned int *fcount = FILE_FCOUNT(file); + + if (fcount != NULL) { + max = num_var_ranges; + for (i = 0; i < max; ++i) { + while (fcount[i] > 0) { + mtrr_del(i, 0, 0); + --fcount[i]; + } + } + kfree(fcount); + FILE_FCOUNT(file) = NULL; + } + return single_release(ino, file); +} + +static int mtrr_seq_show(struct seq_file *seq, void *offset); + +static int mtrr_open(struct inode *inode, struct file *file) +{ + if (!mtrr_if) + return -EIO; + if (!mtrr_if->get) + return -ENXIO; + return single_open(file, mtrr_seq_show, NULL); +} + +static struct file_operations mtrr_fops = { + .owner = THIS_MODULE, + .open = mtrr_open, + .read = seq_read, + .llseek = seq_lseek, + .write = mtrr_write, + .ioctl = mtrr_ioctl, + .release = mtrr_close, +}; + + +static struct proc_dir_entry *proc_root_mtrr; + + +static int mtrr_seq_show(struct seq_file *seq, void *offset) +{ + char factor; + int i, max, len; + mtrr_type type; + unsigned long base; + unsigned int size; + + len = 0; + max = num_var_ranges; + for (i = 0; i < max; i++) { + mtrr_if->get(i, &base, &size, &type); + if (size == 0) + usage_table[i] = 0; + else { + if (size < (0x100000 >> PAGE_SHIFT)) { + /* less than 1MB */ + factor = 'K'; + size <<= PAGE_SHIFT - 10; + } else { + factor = 'M'; + size >>= 20 - PAGE_SHIFT; + } + /* RED-PEN: base can be > 32bit */ + len += seq_printf(seq, + "reg%02i: base=0x%05lx000 (%4liMB), size=%4i%cB: %s, count=%d\n", + i, base, base >> (20 - PAGE_SHIFT), size, factor, + mtrr_attrib_to_str(type), usage_table[i]); + } + } + return 0; +} + +static int __init mtrr_if_init(void) +{ + struct cpuinfo_x86 *c = &boot_cpu_data; + + if ((!cpu_has(c, X86_FEATURE_MTRR)) && + (!cpu_has(c, X86_FEATURE_K6_MTRR)) && + (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) && + (!cpu_has(c, X86_FEATURE_CENTAUR_MCR))) + return -ENODEV; + + proc_root_mtrr = + create_proc_entry("mtrr", S_IWUSR | S_IRUGO, &proc_root); + if (proc_root_mtrr) { + proc_root_mtrr->owner = THIS_MODULE; + proc_root_mtrr->proc_fops = &mtrr_fops; + } + return 0; +} + +arch_initcall(mtrr_if_init); +#endif /* CONFIG_PROC_FS */ |