1 #include <linux/init.h>
2 #include <linux/proc_fs.h>
3 #include <linux/ctype.h>
4 #include <linux/module.h>
5 #include <linux/seq_file.h>
6 #include <asm/uaccess.h>
13 /* RED-PEN: this is accessed without any locking */
14 extern unsigned int *usage_table;
17 #define FILE_FCOUNT(f) (((struct seq_file *)((f)->private_data))->private)
19 static char *mtrr_strings[MTRR_NUM_TYPES] =
22 "write-combining", /* 1 */
25 "write-through", /* 4 */
26 "write-protect", /* 5 */
30 char *mtrr_attrib_to_str(int x)
32 return (x <= 6) ? mtrr_strings[x] : "?";
38 mtrr_file_add(unsigned long base, unsigned long size,
39 unsigned int type, char increment, struct file *file, int page)
42 unsigned int *fcount = FILE_FCOUNT(file);
46 fcount = kmalloc(max * sizeof *fcount, GFP_KERNEL);
49 memset(fcount, 0, max * sizeof *fcount);
50 FILE_FCOUNT(file) = fcount;
53 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
58 reg = mtrr_add_page(base, size, type, 1);
65 mtrr_file_del(unsigned long base, unsigned long size,
66 struct file *file, int page)
69 unsigned int *fcount = FILE_FCOUNT(file);
72 if ((base & (PAGE_SIZE - 1)) || (size & (PAGE_SIZE - 1)))
77 reg = mtrr_del_page(-1, base, size);
88 /* RED-PEN: seq_file can seek now. this is ignored. */
90 mtrr_write(struct file *file, const char __user *buf, size_t len, loff_t * ppos)
91 /* Format of control line:
92 "base=%Lx size=%Lx type=%s" OR:
98 unsigned long long base, size;
100 char line[LINE_SIZE];
102 if (!capable(CAP_SYS_ADMIN))
104 memset(line, 0, LINE_SIZE);
107 if (copy_from_user(line, buf, len - 1))
109 ptr = line + strlen(line) - 1;
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 inode *inode, struct file *file,
150 unsigned int cmd, unsigned long __arg)
154 struct mtrr_sentry sentry;
155 struct mtrr_gentry gentry;
156 void __user *arg = (void __user *) __arg;
161 case MTRRIOC_ADD_ENTRY:
162 if (!capable(CAP_SYS_ADMIN))
164 if (copy_from_user(&sentry, arg, sizeof sentry))
167 mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
172 case MTRRIOC_SET_ENTRY:
173 if (!capable(CAP_SYS_ADMIN))
175 if (copy_from_user(&sentry, arg, sizeof sentry))
177 err = mtrr_add(sentry.base, sentry.size, sentry.type, 0);
181 case MTRRIOC_DEL_ENTRY:
182 if (!capable(CAP_SYS_ADMIN))
184 if (copy_from_user(&sentry, arg, sizeof sentry))
186 err = mtrr_file_del(sentry.base, sentry.size, file, 0);
190 case MTRRIOC_KILL_ENTRY:
191 if (!capable(CAP_SYS_ADMIN))
193 if (copy_from_user(&sentry, arg, sizeof sentry))
195 err = mtrr_del(-1, sentry.base, sentry.size);
199 case MTRRIOC_GET_ENTRY:
200 if (copy_from_user(&gentry, arg, sizeof gentry))
202 if (gentry.regnum >= num_var_ranges)
204 mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type);
206 /* Hide entries that go above 4GB */
207 if (gentry.base + gentry.size > 0x100000
208 || gentry.size == 0x100000)
209 gentry.base = gentry.size = gentry.type = 0;
211 gentry.base <<= PAGE_SHIFT;
212 gentry.size <<= PAGE_SHIFT;
216 if (copy_to_user(arg, &gentry, sizeof gentry))
219 case MTRRIOC_ADD_PAGE_ENTRY:
220 if (!capable(CAP_SYS_ADMIN))
222 if (copy_from_user(&sentry, arg, sizeof sentry))
225 mtrr_file_add(sentry.base, sentry.size, sentry.type, 1,
230 case MTRRIOC_SET_PAGE_ENTRY:
231 if (!capable(CAP_SYS_ADMIN))
233 if (copy_from_user(&sentry, arg, sizeof sentry))
235 err = mtrr_add_page(sentry.base, sentry.size, sentry.type, 0);
239 case MTRRIOC_DEL_PAGE_ENTRY:
240 if (!capable(CAP_SYS_ADMIN))
242 if (copy_from_user(&sentry, arg, sizeof sentry))
244 err = mtrr_file_del(sentry.base, sentry.size, file, 1);
248 case MTRRIOC_KILL_PAGE_ENTRY:
249 if (!capable(CAP_SYS_ADMIN))
251 if (copy_from_user(&sentry, arg, sizeof sentry))
253 err = mtrr_del_page(-1, sentry.base, sentry.size);
257 case MTRRIOC_GET_PAGE_ENTRY:
258 if (copy_from_user(&gentry, arg, sizeof gentry))
260 if (gentry.regnum >= num_var_ranges)
262 mtrr_if->get(gentry.regnum, &gentry.base, &gentry.size, &type);
265 if (copy_to_user(arg, &gentry, sizeof gentry))
273 mtrr_close(struct inode *ino, struct file *file)
276 unsigned int *fcount = FILE_FCOUNT(file);
278 if (fcount != NULL) {
279 max = num_var_ranges;
280 for (i = 0; i < max; ++i) {
281 while (fcount[i] > 0) {
287 FILE_FCOUNT(file) = NULL;
289 return single_release(ino, file);
292 static int mtrr_seq_show(struct seq_file *seq, void *offset);
294 static int mtrr_open(struct inode *inode, struct file *file)
300 return single_open(file, mtrr_seq_show, NULL);
303 static struct file_operations mtrr_fops = {
304 .owner = THIS_MODULE,
310 .release = mtrr_close,
314 static struct proc_dir_entry *proc_root_mtrr;
317 static int mtrr_seq_show(struct seq_file *seq, void *offset)
326 max = num_var_ranges;
327 for (i = 0; i < max; i++) {
328 mtrr_if->get(i, &base, &size, &type);
332 if (size < (0x100000 >> PAGE_SHIFT)) {
335 size <<= PAGE_SHIFT - 10;
338 size >>= 20 - PAGE_SHIFT;
340 /* RED-PEN: base can be > 32bit */
341 len += seq_printf(seq,
342 "reg%02i: base=0x%05lx000 (%4liMB), size=%4i%cB: %s, count=%d\n",
343 i, base, base >> (20 - PAGE_SHIFT), size, factor,
344 mtrr_attrib_to_str(type), usage_table[i]);
350 static int __init mtrr_if_init(void)
352 struct cpuinfo_x86 *c = &boot_cpu_data;
354 if ((!cpu_has(c, X86_FEATURE_MTRR)) &&
355 (!cpu_has(c, X86_FEATURE_K6_MTRR)) &&
356 (!cpu_has(c, X86_FEATURE_CYRIX_ARR)) &&
357 (!cpu_has(c, X86_FEATURE_CENTAUR_MCR)))
361 create_proc_entry("mtrr", S_IWUSR | S_IRUGO, &proc_root);
362 if (proc_root_mtrr) {
363 proc_root_mtrr->owner = THIS_MODULE;
364 proc_root_mtrr->proc_fops = &mtrr_fops;
369 arch_initcall(mtrr_if_init);
370 #endif /* CONFIG_PROC_FS */