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Commit | Line | Data |
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1da177e4 | 1 | #include <linux/types.h> |
1da177e4 LT |
2 | #include <linux/string.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/module.h> | |
1da177e4 | 5 | #include <linux/dmi.h> |
3ed3bce8 | 6 | #include <linux/efi.h> |
1da177e4 | 7 | #include <linux/bootmem.h> |
e9928674 | 8 | #include <linux/slab.h> |
f2d3efed | 9 | #include <asm/dmi.h> |
1da177e4 | 10 | |
79da4721 PW |
11 | static char dmi_empty_string[] = " "; |
12 | ||
f3069ae9 | 13 | static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) |
1da177e4 | 14 | { |
1855256c | 15 | const u8 *bp = ((u8 *) dm) + dm->length; |
1249c513 | 16 | |
c3c7120d | 17 | if (s) { |
1da177e4 | 18 | s--; |
c3c7120d AP |
19 | while (s > 0 && *bp) { |
20 | bp += strlen(bp) + 1; | |
21 | s--; | |
22 | } | |
23 | ||
24 | if (*bp != 0) { | |
79da4721 PW |
25 | size_t len = strlen(bp)+1; |
26 | size_t cmp_len = len > 8 ? 8 : len; | |
27 | ||
28 | if (!memcmp(bp, dmi_empty_string, cmp_len)) | |
29 | return dmi_empty_string; | |
f3069ae9 | 30 | return bp; |
c3c7120d | 31 | } |
4f705ae3 | 32 | } |
c3c7120d | 33 | |
f3069ae9 JD |
34 | return ""; |
35 | } | |
36 | ||
37 | static char * __init dmi_string(const struct dmi_header *dm, u8 s) | |
38 | { | |
39 | const char *bp = dmi_string_nosave(dm, s); | |
40 | char *str; | |
41 | size_t len; | |
42 | ||
43 | if (bp == dmi_empty_string) | |
44 | return dmi_empty_string; | |
45 | ||
46 | len = strlen(bp) + 1; | |
47 | str = dmi_alloc(len); | |
48 | if (str != NULL) | |
49 | strcpy(str, bp); | |
50 | else | |
51 | printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len); | |
52 | ||
c3c7120d | 53 | return str; |
1da177e4 LT |
54 | } |
55 | ||
56 | /* | |
57 | * We have to be cautious here. We have seen BIOSes with DMI pointers | |
58 | * pointing to completely the wrong place for example | |
59 | */ | |
7fce084a JD |
60 | static void dmi_table(u8 *buf, int len, int num, |
61 | void (*decode)(const struct dmi_header *)) | |
1da177e4 | 62 | { |
7fce084a | 63 | u8 *data = buf; |
1249c513 | 64 | int i = 0; |
4f705ae3 | 65 | |
1da177e4 | 66 | /* |
4f705ae3 BH |
67 | * Stop when we see all the items the table claimed to have |
68 | * OR we run off the end of the table (also happens) | |
69 | */ | |
1249c513 | 70 | while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { |
1855256c JG |
71 | const struct dmi_header *dm = (const struct dmi_header *)data; |
72 | ||
1da177e4 LT |
73 | /* |
74 | * We want to know the total length (formated area and strings) | |
75 | * before decoding to make sure we won't run off the table in | |
76 | * dmi_decode or dmi_string | |
77 | */ | |
1249c513 AP |
78 | data += dm->length; |
79 | while ((data - buf < len - 1) && (data[0] || data[1])) | |
1da177e4 | 80 | data++; |
1249c513 | 81 | if (data - buf < len - 1) |
1da177e4 | 82 | decode(dm); |
1249c513 | 83 | data += 2; |
1da177e4 LT |
84 | i++; |
85 | } | |
7fce084a JD |
86 | } |
87 | ||
88 | static u32 dmi_base; | |
89 | static u16 dmi_len; | |
90 | static u16 dmi_num; | |
91 | ||
92 | static int __init dmi_walk_early(void (*decode)(const struct dmi_header *)) | |
93 | { | |
94 | u8 *buf; | |
95 | ||
96 | buf = dmi_ioremap(dmi_base, dmi_len); | |
97 | if (buf == NULL) | |
98 | return -1; | |
99 | ||
100 | dmi_table(buf, dmi_len, dmi_num, decode); | |
101 | ||
102 | dmi_iounmap(buf, dmi_len); | |
1da177e4 LT |
103 | return 0; |
104 | } | |
105 | ||
1855256c | 106 | static int __init dmi_checksum(const u8 *buf) |
1da177e4 | 107 | { |
1249c513 | 108 | u8 sum = 0; |
1da177e4 | 109 | int a; |
4f705ae3 | 110 | |
1249c513 AP |
111 | for (a = 0; a < 15; a++) |
112 | sum += buf[a]; | |
113 | ||
114 | return sum == 0; | |
1da177e4 LT |
115 | } |
116 | ||
1da177e4 | 117 | static char *dmi_ident[DMI_STRING_MAX]; |
ebad6a42 | 118 | static LIST_HEAD(dmi_devices); |
4f5c791a | 119 | int dmi_available; |
1da177e4 LT |
120 | |
121 | /* | |
122 | * Save a DMI string | |
123 | */ | |
1855256c | 124 | static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string) |
1da177e4 | 125 | { |
1855256c JG |
126 | const char *d = (const char*) dm; |
127 | char *p; | |
1249c513 | 128 | |
1da177e4 LT |
129 | if (dmi_ident[slot]) |
130 | return; | |
1249c513 | 131 | |
c3c7120d AP |
132 | p = dmi_string(dm, d[string]); |
133 | if (p == NULL) | |
134 | return; | |
135 | ||
136 | dmi_ident[slot] = p; | |
1da177e4 LT |
137 | } |
138 | ||
1855256c | 139 | static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index) |
4f5c791a | 140 | { |
1855256c | 141 | const u8 *d = (u8*) dm + index; |
4f5c791a LP |
142 | char *s; |
143 | int is_ff = 1, is_00 = 1, i; | |
144 | ||
145 | if (dmi_ident[slot]) | |
146 | return; | |
147 | ||
148 | for (i = 0; i < 16 && (is_ff || is_00); i++) { | |
149 | if(d[i] != 0x00) is_ff = 0; | |
150 | if(d[i] != 0xFF) is_00 = 0; | |
151 | } | |
152 | ||
153 | if (is_ff || is_00) | |
154 | return; | |
155 | ||
156 | s = dmi_alloc(16*2+4+1); | |
157 | if (!s) | |
158 | return; | |
159 | ||
160 | sprintf(s, | |
161 | "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X", | |
162 | d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], | |
163 | d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]); | |
164 | ||
165 | dmi_ident[slot] = s; | |
166 | } | |
167 | ||
1855256c | 168 | static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index) |
4f5c791a | 169 | { |
1855256c | 170 | const u8 *d = (u8*) dm + index; |
4f5c791a LP |
171 | char *s; |
172 | ||
173 | if (dmi_ident[slot]) | |
174 | return; | |
175 | ||
176 | s = dmi_alloc(4); | |
177 | if (!s) | |
178 | return; | |
179 | ||
180 | sprintf(s, "%u", *d & 0x7F); | |
181 | dmi_ident[slot] = s; | |
182 | } | |
183 | ||
f3069ae9 JD |
184 | static void __init dmi_save_one_device(int type, const char *name) |
185 | { | |
186 | struct dmi_device *dev; | |
187 | ||
188 | /* No duplicate device */ | |
189 | if (dmi_find_device(type, name, NULL)) | |
190 | return; | |
191 | ||
192 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); | |
193 | if (!dev) { | |
194 | printk(KERN_ERR "dmi_save_one_device: out of memory.\n"); | |
195 | return; | |
196 | } | |
197 | ||
198 | dev->type = type; | |
199 | strcpy((char *)(dev + 1), name); | |
200 | dev->name = (char *)(dev + 1); | |
201 | dev->device_data = NULL; | |
202 | list_add(&dev->list, &dmi_devices); | |
203 | } | |
204 | ||
1855256c | 205 | static void __init dmi_save_devices(const struct dmi_header *dm) |
ebad6a42 AP |
206 | { |
207 | int i, count = (dm->length - sizeof(struct dmi_header)) / 2; | |
ebad6a42 AP |
208 | |
209 | for (i = 0; i < count; i++) { | |
1855256c | 210 | const char *d = (char *)(dm + 1) + (i * 2); |
ebad6a42 AP |
211 | |
212 | /* Skip disabled device */ | |
213 | if ((*d & 0x80) == 0) | |
214 | continue; | |
215 | ||
f3069ae9 | 216 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); |
2e0c1f6c SM |
217 | } |
218 | } | |
219 | ||
1855256c | 220 | static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) |
2e0c1f6c SM |
221 | { |
222 | int i, count = *(u8 *)(dm + 1); | |
223 | struct dmi_device *dev; | |
224 | ||
225 | for (i = 1; i <= count; i++) { | |
79da4721 PW |
226 | char *devname = dmi_string(dm, i); |
227 | ||
43fe105a | 228 | if (devname == dmi_empty_string) |
79da4721 | 229 | continue; |
79da4721 | 230 | |
2e0c1f6c SM |
231 | dev = dmi_alloc(sizeof(*dev)); |
232 | if (!dev) { | |
233 | printk(KERN_ERR | |
234 | "dmi_save_oem_strings_devices: out of memory.\n"); | |
235 | break; | |
236 | } | |
237 | ||
238 | dev->type = DMI_DEV_TYPE_OEM_STRING; | |
79da4721 | 239 | dev->name = devname; |
2e0c1f6c | 240 | dev->device_data = NULL; |
ebad6a42 AP |
241 | |
242 | list_add(&dev->list, &dmi_devices); | |
243 | } | |
244 | } | |
245 | ||
1855256c | 246 | static void __init dmi_save_ipmi_device(const struct dmi_header *dm) |
ebad6a42 AP |
247 | { |
248 | struct dmi_device *dev; | |
249 | void * data; | |
250 | ||
e9928674 | 251 | data = dmi_alloc(dm->length); |
ebad6a42 AP |
252 | if (data == NULL) { |
253 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); | |
254 | return; | |
255 | } | |
256 | ||
257 | memcpy(data, dm, dm->length); | |
258 | ||
e9928674 | 259 | dev = dmi_alloc(sizeof(*dev)); |
ebad6a42 AP |
260 | if (!dev) { |
261 | printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n"); | |
262 | return; | |
263 | } | |
264 | ||
265 | dev->type = DMI_DEV_TYPE_IPMI; | |
266 | dev->name = "IPMI controller"; | |
267 | dev->device_data = data; | |
268 | ||
abd24df8 | 269 | list_add_tail(&dev->list, &dmi_devices); |
ebad6a42 AP |
270 | } |
271 | ||
b4bd7d59 WVS |
272 | static void __init dmi_save_extended_devices(const struct dmi_header *dm) |
273 | { | |
274 | const u8 *d = (u8*) dm + 5; | |
b4bd7d59 WVS |
275 | |
276 | /* Skip disabled device */ | |
277 | if ((*d & 0x80) == 0) | |
278 | return; | |
279 | ||
f3069ae9 | 280 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); |
b4bd7d59 WVS |
281 | } |
282 | ||
1da177e4 LT |
283 | /* |
284 | * Process a DMI table entry. Right now all we care about are the BIOS | |
285 | * and machine entries. For 2.5 we should pull the smbus controller info | |
286 | * out of here. | |
287 | */ | |
1855256c | 288 | static void __init dmi_decode(const struct dmi_header *dm) |
1da177e4 | 289 | { |
1249c513 | 290 | switch(dm->type) { |
ebad6a42 | 291 | case 0: /* BIOS Information */ |
1249c513 | 292 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
1249c513 | 293 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
1249c513 AP |
294 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
295 | break; | |
ebad6a42 | 296 | case 1: /* System Information */ |
1249c513 | 297 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
1249c513 | 298 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
1249c513 | 299 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
1249c513 | 300 | dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); |
4f5c791a | 301 | dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); |
1249c513 | 302 | break; |
ebad6a42 | 303 | case 2: /* Base Board Information */ |
1249c513 | 304 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
1249c513 | 305 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
1249c513 | 306 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
4f5c791a LP |
307 | dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); |
308 | dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); | |
309 | break; | |
310 | case 3: /* Chassis Information */ | |
311 | dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); | |
312 | dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); | |
313 | dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); | |
314 | dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); | |
315 | dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); | |
1249c513 | 316 | break; |
ebad6a42 AP |
317 | case 10: /* Onboard Devices Information */ |
318 | dmi_save_devices(dm); | |
319 | break; | |
2e0c1f6c SM |
320 | case 11: /* OEM Strings */ |
321 | dmi_save_oem_strings_devices(dm); | |
322 | break; | |
ebad6a42 AP |
323 | case 38: /* IPMI Device Information */ |
324 | dmi_save_ipmi_device(dm); | |
b4bd7d59 WVS |
325 | break; |
326 | case 41: /* Onboard Devices Extended Information */ | |
327 | dmi_save_extended_devices(dm); | |
1da177e4 LT |
328 | } |
329 | } | |
330 | ||
1855256c | 331 | static int __init dmi_present(const char __iomem *p) |
1da177e4 | 332 | { |
61e032fa | 333 | u8 buf[15]; |
1855256c | 334 | |
3ed3bce8 MD |
335 | memcpy_fromio(buf, p, 15); |
336 | if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) { | |
7fce084a JD |
337 | dmi_num = (buf[13] << 8) | buf[12]; |
338 | dmi_len = (buf[7] << 8) | buf[6]; | |
339 | dmi_base = (buf[11] << 24) | (buf[10] << 16) | | |
3ed3bce8 | 340 | (buf[9] << 8) | buf[8]; |
61e032fa | 341 | |
3ed3bce8 MD |
342 | /* |
343 | * DMI version 0.0 means that the real version is taken from | |
344 | * the SMBIOS version, which we don't know at this point. | |
345 | */ | |
346 | if (buf[14] != 0) | |
347 | printk(KERN_INFO "DMI %d.%d present.\n", | |
348 | buf[14] >> 4, buf[14] & 0xF); | |
349 | else | |
350 | printk(KERN_INFO "DMI present.\n"); | |
7fce084a | 351 | if (dmi_walk_early(dmi_decode) == 0) |
3ed3bce8 MD |
352 | return 0; |
353 | } | |
354 | return 1; | |
355 | } | |
61e032fa | 356 | |
3ed3bce8 MD |
357 | void __init dmi_scan_machine(void) |
358 | { | |
359 | char __iomem *p, *q; | |
360 | int rc; | |
361 | ||
362 | if (efi_enabled) { | |
b2c99e3c | 363 | if (efi.smbios == EFI_INVALID_TABLE_ADDR) |
3ed3bce8 MD |
364 | goto out; |
365 | ||
4f5c791a LP |
366 | /* This is called as a core_initcall() because it isn't |
367 | * needed during early boot. This also means we can | |
368 | * iounmap the space when we're done with it. | |
369 | */ | |
b2c99e3c | 370 | p = dmi_ioremap(efi.smbios, 32); |
3ed3bce8 MD |
371 | if (p == NULL) |
372 | goto out; | |
373 | ||
374 | rc = dmi_present(p + 0x10); /* offset of _DMI_ string */ | |
23dd842c | 375 | dmi_iounmap(p, 32); |
4f5c791a LP |
376 | if (!rc) { |
377 | dmi_available = 1; | |
3ed3bce8 | 378 | return; |
4f5c791a | 379 | } |
3ed3bce8 MD |
380 | } |
381 | else { | |
382 | /* | |
383 | * no iounmap() for that ioremap(); it would be a no-op, but | |
384 | * it's so early in setup that sucker gets confused into doing | |
385 | * what it shouldn't if we actually call it. | |
386 | */ | |
387 | p = dmi_ioremap(0xF0000, 0x10000); | |
388 | if (p == NULL) | |
389 | goto out; | |
390 | ||
391 | for (q = p; q < p + 0x10000; q += 16) { | |
392 | rc = dmi_present(q); | |
4f5c791a LP |
393 | if (!rc) { |
394 | dmi_available = 1; | |
0d64484f | 395 | dmi_iounmap(p, 0x10000); |
61e032fa | 396 | return; |
4f5c791a | 397 | } |
61e032fa | 398 | } |
3212bff3 | 399 | dmi_iounmap(p, 0x10000); |
61e032fa | 400 | } |
3ed3bce8 | 401 | out: printk(KERN_INFO "DMI not present or invalid.\n"); |
1da177e4 LT |
402 | } |
403 | ||
1da177e4 LT |
404 | /** |
405 | * dmi_check_system - check system DMI data | |
406 | * @list: array of dmi_system_id structures to match against | |
b0ef371e RD |
407 | * All non-null elements of the list must match |
408 | * their slot's (field index's) data (i.e., each | |
409 | * list string must be a substring of the specified | |
410 | * DMI slot's string data) to be considered a | |
411 | * successful match. | |
1da177e4 LT |
412 | * |
413 | * Walk the blacklist table running matching functions until someone | |
414 | * returns non zero or we hit the end. Callback function is called for | |
b0ef371e | 415 | * each successful match. Returns the number of matches. |
1da177e4 | 416 | */ |
1855256c | 417 | int dmi_check_system(const struct dmi_system_id *list) |
1da177e4 LT |
418 | { |
419 | int i, count = 0; | |
1855256c | 420 | const struct dmi_system_id *d = list; |
1da177e4 LT |
421 | |
422 | while (d->ident) { | |
423 | for (i = 0; i < ARRAY_SIZE(d->matches); i++) { | |
424 | int s = d->matches[i].slot; | |
425 | if (s == DMI_NONE) | |
426 | continue; | |
427 | if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr)) | |
428 | continue; | |
429 | /* No match */ | |
430 | goto fail; | |
431 | } | |
640e8033 | 432 | count++; |
1da177e4 LT |
433 | if (d->callback && d->callback(d)) |
434 | break; | |
1da177e4 LT |
435 | fail: d++; |
436 | } | |
437 | ||
438 | return count; | |
439 | } | |
1da177e4 LT |
440 | EXPORT_SYMBOL(dmi_check_system); |
441 | ||
442 | /** | |
443 | * dmi_get_system_info - return DMI data value | |
b0ef371e | 444 | * @field: data index (see enum dmi_field) |
1da177e4 LT |
445 | * |
446 | * Returns one DMI data value, can be used to perform | |
447 | * complex DMI data checks. | |
448 | */ | |
1855256c | 449 | const char *dmi_get_system_info(int field) |
1da177e4 LT |
450 | { |
451 | return dmi_ident[field]; | |
452 | } | |
e70c9d5e | 453 | EXPORT_SYMBOL(dmi_get_system_info); |
ebad6a42 | 454 | |
a1bae672 AK |
455 | |
456 | /** | |
457 | * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information. | |
458 | * @str: Case sensitive Name | |
459 | */ | |
1855256c | 460 | int dmi_name_in_vendors(const char *str) |
a1bae672 AK |
461 | { |
462 | static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR, | |
463 | DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR, | |
464 | DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE }; | |
465 | int i; | |
466 | for (i = 0; fields[i] != DMI_NONE; i++) { | |
467 | int f = fields[i]; | |
468 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
469 | return 1; | |
470 | } | |
471 | return 0; | |
472 | } | |
473 | EXPORT_SYMBOL(dmi_name_in_vendors); | |
474 | ||
ebad6a42 AP |
475 | /** |
476 | * dmi_find_device - find onboard device by type/name | |
477 | * @type: device type or %DMI_DEV_TYPE_ANY to match all device types | |
b0ef371e | 478 | * @name: device name string or %NULL to match all |
ebad6a42 AP |
479 | * @from: previous device found in search, or %NULL for new search. |
480 | * | |
481 | * Iterates through the list of known onboard devices. If a device is | |
482 | * found with a matching @vendor and @device, a pointer to its device | |
483 | * structure is returned. Otherwise, %NULL is returned. | |
b0ef371e | 484 | * A new search is initiated by passing %NULL as the @from argument. |
ebad6a42 AP |
485 | * If @from is not %NULL, searches continue from next device. |
486 | */ | |
1855256c JG |
487 | const struct dmi_device * dmi_find_device(int type, const char *name, |
488 | const struct dmi_device *from) | |
ebad6a42 | 489 | { |
1855256c JG |
490 | const struct list_head *head = from ? &from->list : &dmi_devices; |
491 | struct list_head *d; | |
ebad6a42 AP |
492 | |
493 | for(d = head->next; d != &dmi_devices; d = d->next) { | |
1855256c JG |
494 | const struct dmi_device *dev = |
495 | list_entry(d, struct dmi_device, list); | |
ebad6a42 AP |
496 | |
497 | if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && | |
498 | ((name == NULL) || (strcmp(dev->name, name) == 0))) | |
499 | return dev; | |
500 | } | |
501 | ||
502 | return NULL; | |
503 | } | |
504 | EXPORT_SYMBOL(dmi_find_device); | |
f083a329 AK |
505 | |
506 | /** | |
507 | * dmi_get_year - Return year of a DMI date | |
508 | * @field: data index (like dmi_get_system_info) | |
509 | * | |
510 | * Returns -1 when the field doesn't exist. 0 when it is broken. | |
511 | */ | |
512 | int dmi_get_year(int field) | |
513 | { | |
514 | int year; | |
1855256c | 515 | const char *s = dmi_get_system_info(field); |
f083a329 AK |
516 | |
517 | if (!s) | |
518 | return -1; | |
519 | if (*s == '\0') | |
520 | return 0; | |
521 | s = strrchr(s, '/'); | |
522 | if (!s) | |
523 | return 0; | |
524 | ||
525 | s += 1; | |
526 | year = simple_strtoul(s, NULL, 0); | |
527 | if (year && year < 100) { /* 2-digit year */ | |
528 | year += 1900; | |
529 | if (year < 1996) /* no dates < spec 1.0 */ | |
530 | year += 100; | |
531 | } | |
532 | ||
533 | return year; | |
534 | } | |
7fce084a JD |
535 | |
536 | /** | |
537 | * dmi_walk - Walk the DMI table and get called back for every record | |
538 | * @decode: Callback function | |
539 | * | |
540 | * Returns -1 when the DMI table can't be reached, 0 on success. | |
541 | */ | |
542 | int dmi_walk(void (*decode)(const struct dmi_header *)) | |
543 | { | |
544 | u8 *buf; | |
545 | ||
546 | if (!dmi_available) | |
547 | return -1; | |
548 | ||
549 | buf = ioremap(dmi_base, dmi_len); | |
550 | if (buf == NULL) | |
551 | return -1; | |
552 | ||
553 | dmi_table(buf, dmi_len, dmi_num, decode); | |
554 | ||
555 | iounmap(buf); | |
556 | return 0; | |
557 | } | |
558 | EXPORT_SYMBOL_GPL(dmi_walk); |