1da177e4c3
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!
375 lines
8.6 KiB
C
375 lines
8.6 KiB
C
#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 */
|