1 #include <linux/init.h>
2 #include <linux/proc_fs.h>
3 #include <linux/capability.h>
4 #include <linux/ctype.h>
5 #include <linux/module.h>
6 #include <linux/seq_file.h>
7 #include <asm/uaccess.h>
14 #define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
16 static const char *const mtrr_strings[MTRR_NUM_TYPES] =
19 "write-combining", /* 1 */
22 "write-through", /* 4 */
23 "write-protect", /* 5 */
27 const char *mtrr_attrib_to_str(int x)
29 return (x <= 6) ? mtrr_strings[x] : "?";
35 mtrr_file_add(unsigned long base, unsigned long size,
36 unsigned int type, bool increment, struct file *file, int page)
39 unsigned int *fcount = FILE_FCOUNT(file);
43 fcount = kzalloc(max * sizeof *fcount, GFP_KERNEL);
46 FILE_FCOUNT(file) = fcount;
49 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
54 reg = mtrr_add_page(base, size, type, true);
61 mtrr_file_del(unsigned long base, unsigned long size,
62 struct file *file, int page)
65 unsigned int *fcount = FILE_FCOUNT(file);
68 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
73 reg = mtrr_del_page(-1, base, size);
84 /* RED-PEN: seq_file can seek now. this is ignored. */
86 mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
87 /* Format of control line:
88 "base=%Lx size=%Lx type=%s" OR:
94 unsigned long long base, size;
99 if (!capable(CAP_SYS_ADMIN))
103 memset(line, 0, LINE_SIZE);
106 if (copy_from_user(line, buf, len - 1))
108 linelen = strlen(line);
109 ptr = line + linelen - 1;
110 if (linelen && *ptr == '\n')
112 if (!strncmp(line, "disable=", 8)) {
113 reg = simple_strtoul(line + 8, &ptr, 0);
114 err = mtrr_del_page(reg, 0, 0);
119 if (strncmp(line, "base=", 5))
121 base = simple_strtoull(line + 5, &ptr, 0);
122 for (; isspace(*ptr); ++ptr) ;
123 if (strncmp(ptr, "size=", 5))
125 size = simple_strtoull(ptr + 5, &ptr, 0);
126 if ((base & 0xfff) || (size & 0xfff))
128 for (; isspace(*ptr); ++ptr) ;
129 if (strncmp(ptr, "type=", 5))
132 for (; isspace(*ptr); ++ptr) ;
133 for (i = 0; i < MTRR_NUM_TYPES; ++i) {
134 if (strcmp(ptr, mtrr_strings[i]))
139 mtrr_add_page((unsigned long) base, (unsigned long) size, i,
149 mtrr_ioctl(struct file *file, unsigned int cmd, unsigned long __arg)
154 struct mtrr_sentry sentry;
155 struct mtrr_gentry gentry;
156 void __user *arg = (void __user *) __arg;
159 case MTRRIOC_ADD_ENTRY:
160 case MTRRIOC_SET_ENTRY:
161 case MTRRIOC_DEL_ENTRY:
162 case MTRRIOC_KILL_ENTRY:
163 case MTRRIOC_ADD_PAGE_ENTRY:
164 case MTRRIOC_SET_PAGE_ENTRY:
165 case MTRRIOC_DEL_PAGE_ENTRY:
166 case MTRRIOC_KILL_PAGE_ENTRY:
167 if (copy_from_user(&sentry, arg, sizeof sentry))
170 case MTRRIOC_GET_ENTRY:
171 case MTRRIOC_GET_PAGE_ENTRY:
172 if (copy_from_user(&gentry, arg, sizeof gentry))
176 case MTRRIOC32_ADD_ENTRY:
177 case MTRRIOC32_SET_ENTRY:
178 case MTRRIOC32_DEL_ENTRY:
179 case MTRRIOC32_KILL_ENTRY:
180 case MTRRIOC32_ADD_PAGE_ENTRY:
181 case MTRRIOC32_SET_PAGE_ENTRY:
182 case MTRRIOC32_DEL_PAGE_ENTRY:
183 case MTRRIOC32_KILL_PAGE_ENTRY: {
184 struct mtrr_sentry32 __user *s32 = (struct mtrr_sentry32 __user *)__arg;
185 err = get_user(sentry.base, &s32->base);
186 err |= get_user(sentry.size, &s32->size);
187 err |= get_user(sentry.type, &s32->type);
192 case MTRRIOC32_GET_ENTRY:
193 case MTRRIOC32_GET_PAGE_ENTRY: {
194 struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg;
195 err = get_user(gentry.regnum, &g32->regnum);
196 err |= get_user(gentry.base, &g32->base);
197 err |= get_user(gentry.size, &g32->size);
198 err |= get_user(gentry.type, &g32->type);
209 case MTRRIOC_ADD_ENTRY:
211 case MTRRIOC32_ADD_ENTRY:
213 if (!capable(CAP_SYS_ADMIN))
216 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
219 case MTRRIOC_SET_ENTRY:
221 case MTRRIOC32_SET_ENTRY:
223 if (!capable(CAP_SYS_ADMIN))
225 err = mtrr_add(sentry.base, sentry.size, sentry.type, false);
227 case MTRRIOC_DEL_ENTRY:
229 case MTRRIOC32_DEL_ENTRY:
231 if (!capable(CAP_SYS_ADMIN))
233 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
235 case MTRRIOC_KILL_ENTRY:
237 case MTRRIOC32_KILL_ENTRY:
239 if (!capable(CAP_SYS_ADMIN))
241 err = mtrr_del(-1, sentry.base, sentry.size);
243 case MTRRIOC_GET_ENTRY:
245 case MTRRIOC32_GET_ENTRY:
247 if (gentry.regnum >= num_var_ranges)
249 mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
251 /* Hide entries that go above 4GB */
252 if (gentry.base + size - 1 >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT))
253 || size >= (1UL << (8 * sizeof(gentry.size) - PAGE_SHIFT)))
254 gentry.base = gentry.size = gentry.type = 0;
256 gentry.base <<= PAGE_SHIFT;
257 gentry.size = size << PAGE_SHIFT;
262 case MTRRIOC_ADD_PAGE_ENTRY:
264 case MTRRIOC32_ADD_PAGE_ENTRY:
266 if (!capable(CAP_SYS_ADMIN))
269 mtrr_file_add(sentry.base, sentry.size, sentry.type, true,
272 case MTRRIOC_SET_PAGE_ENTRY:
274 case MTRRIOC32_SET_PAGE_ENTRY:
276 if (!capable(CAP_SYS_ADMIN))
279 mtrr_add_page(sentry.base, sentry.size, sentry.type, false);
281 case MTRRIOC_DEL_PAGE_ENTRY:
283 case MTRRIOC32_DEL_PAGE_ENTRY:
285 if (!capable(CAP_SYS_ADMIN))
287 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
289 case MTRRIOC_KILL_PAGE_ENTRY:
291 case MTRRIOC32_KILL_PAGE_ENTRY:
293 if (!capable(CAP_SYS_ADMIN))
295 err = mtrr_del_page(-1, sentry.base, sentry.size);
297 case MTRRIOC_GET_PAGE_ENTRY:
299 case MTRRIOC32_GET_PAGE_ENTRY:
301 if (gentry.regnum >= num_var_ranges)
303 mtrr_if->get(gentry.regnum, &gentry.base, &size, &type);
304 /* Hide entries that would overflow */
305 if (size != (__typeof__(gentry.size))size)
306 gentry.base = gentry.size = gentry.type = 0;
318 case MTRRIOC_GET_ENTRY:
319 case MTRRIOC_GET_PAGE_ENTRY:
320 if (copy_to_user(arg, &gentry, sizeof gentry))
324 case MTRRIOC32_GET_ENTRY:
325 case MTRRIOC32_GET_PAGE_ENTRY: {
326 struct mtrr_gentry32 __user *g32 = (struct mtrr_gentry32 __user *)__arg;
327 err = put_user(gentry.base, &g32->base);
328 err |= put_user(gentry.size, &g32->size);
329 err |= put_user(gentry.regnum, &g32->regnum);
330 err |= put_user(gentry.type, &g32->type);
339 mtrr_close(struct inode *ino, struct file *file)
342 unsigned int *fcount = FILE_FCOUNT(file);
344 if (fcount != NULL) {
345 max = num_var_ranges;
346 for (i = 0; i < max; ++i) {
347 while (fcount[i] > 0) {
353 FILE_FCOUNT(file) = NULL;
355 return single_release(ino, file);
358 static int mtrr_seq_show(struct seq_file *seq, void *offset);
360 static int mtrr_open(struct inode *inode, struct file *file)
366 return single_open(file, mtrr_seq_show, NULL);
369 static const struct file_operations mtrr_fops = {
370 .owner = THIS_MODULE,
375 .unlocked_ioctl = mtrr_ioctl,
376 .compat_ioctl = mtrr_ioctl,
377 .release = mtrr_close,
381 static struct proc_dir_entry *proc_root_mtrr;
384 static int mtrr_seq_show(struct seq_file *seq, void *offset)
389 unsigned long base, size;
392 max = num_var_ranges;
393 for (i = 0; i < max; i++) {
394 mtrr_if->get(i, &base, &size, &type);
396 mtrr_usage_table[i] = 0;
398 if (size < (0x100000 >> PAGE_SHIFT)) {
401 size <<= PAGE_SHIFT - 10;
404 size >>= 20 - PAGE_SHIFT;
406 /* RED-PEN: base can be > 32bit */
407 len += seq_printf(seq,
408 "reg%02i: base=0x%05lx000 (%4luMB), size=%4lu%cB: %s, count=%d\n",
409 i, base, base >> (20 - PAGE_SHIFT), size, factor,
410 mtrr_attrib_to_str(type), mtrr_usage_table[i]);
416 static int __init mtrr_if_init(void)
418 struct cpuinfo_x86 *c = &boot_cpu_data;
420 if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
421 (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
422 (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
423 (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
427 proc_create("mtrr", S_IWUSR | S_IRUGO, NULL, &mtrr_fops);
430 proc_root_mtrr->owner = THIS_MODULE;
434 arch_initcall(mtrr_if_init);
435 #endif /* CONFIG_PROC_FS */