Commit | Line | Data |
---|---|---|
1da177e4 | 1 | #include <linux/types.h> |
1da177e4 LT |
2 | #include <linux/string.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/module.h> | |
8881cdce | 5 | #include <linux/ctype.h> |
1da177e4 | 6 | #include <linux/dmi.h> |
3ed3bce8 | 7 | #include <linux/efi.h> |
1da177e4 | 8 | #include <linux/bootmem.h> |
d114a333 | 9 | #include <linux/random.h> |
f2d3efed | 10 | #include <asm/dmi.h> |
0841c04d | 11 | #include <asm/unaligned.h> |
1da177e4 | 12 | |
cb5dd7c1 PJ |
13 | /* |
14 | * DMI stands for "Desktop Management Interface". It is part | |
15 | * of and an antecedent to, SMBIOS, which stands for System | |
16 | * Management BIOS. See further: http://www.dmtf.org/standards | |
17 | */ | |
ffbbb96d | 18 | static const char dmi_empty_string[] = " "; |
79da4721 | 19 | |
f1d8e614 | 20 | static u16 __initdata dmi_ver; |
9a22b6e7 IM |
21 | /* |
22 | * Catch too early calls to dmi_check_system(): | |
23 | */ | |
24 | static int dmi_initialized; | |
25 | ||
c90fe6bc TH |
26 | /* DMI system identification string used during boot */ |
27 | static char dmi_ids_string[128] __initdata; | |
28 | ||
dd6dad42 CG |
29 | static struct dmi_memdev_info { |
30 | const char *device; | |
31 | const char *bank; | |
32 | u16 handle; | |
33 | } *dmi_memdev; | |
34 | static int dmi_memdev_nr; | |
35 | ||
f3069ae9 | 36 | static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) |
1da177e4 | 37 | { |
1855256c | 38 | const u8 *bp = ((u8 *) dm) + dm->length; |
1249c513 | 39 | |
c3c7120d | 40 | if (s) { |
1da177e4 | 41 | s--; |
c3c7120d AP |
42 | while (s > 0 && *bp) { |
43 | bp += strlen(bp) + 1; | |
44 | s--; | |
45 | } | |
46 | ||
47 | if (*bp != 0) { | |
79da4721 PW |
48 | size_t len = strlen(bp)+1; |
49 | size_t cmp_len = len > 8 ? 8 : len; | |
50 | ||
51 | if (!memcmp(bp, dmi_empty_string, cmp_len)) | |
52 | return dmi_empty_string; | |
f3069ae9 | 53 | return bp; |
c3c7120d | 54 | } |
4f705ae3 | 55 | } |
c3c7120d | 56 | |
f3069ae9 JD |
57 | return ""; |
58 | } | |
59 | ||
ffbbb96d | 60 | static const char * __init dmi_string(const struct dmi_header *dm, u8 s) |
f3069ae9 JD |
61 | { |
62 | const char *bp = dmi_string_nosave(dm, s); | |
63 | char *str; | |
64 | size_t len; | |
65 | ||
66 | if (bp == dmi_empty_string) | |
67 | return dmi_empty_string; | |
68 | ||
69 | len = strlen(bp) + 1; | |
70 | str = dmi_alloc(len); | |
71 | if (str != NULL) | |
72 | strcpy(str, bp); | |
f3069ae9 | 73 | |
c3c7120d | 74 | return str; |
1da177e4 LT |
75 | } |
76 | ||
77 | /* | |
78 | * We have to be cautious here. We have seen BIOSes with DMI pointers | |
79 | * pointing to completely the wrong place for example | |
80 | */ | |
7fce084a | 81 | static void dmi_table(u8 *buf, int len, int num, |
e7a19c56 JD |
82 | void (*decode)(const struct dmi_header *, void *), |
83 | void *private_data) | |
1da177e4 | 84 | { |
7fce084a | 85 | u8 *data = buf; |
1249c513 | 86 | int i = 0; |
4f705ae3 | 87 | |
1da177e4 | 88 | /* |
4f705ae3 BH |
89 | * Stop when we see all the items the table claimed to have |
90 | * OR we run off the end of the table (also happens) | |
91 | */ | |
1249c513 | 92 | while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) { |
1855256c JG |
93 | const struct dmi_header *dm = (const struct dmi_header *)data; |
94 | ||
fc430262 AB |
95 | /* |
96 | * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0] | |
97 | */ | |
98 | if (dm->type == DMI_ENTRY_END_OF_TABLE) | |
99 | break; | |
100 | ||
1da177e4 | 101 | /* |
8638545c AC |
102 | * We want to know the total length (formatted area and |
103 | * strings) before decoding to make sure we won't run off the | |
104 | * table in dmi_decode or dmi_string | |
1da177e4 | 105 | */ |
1249c513 AP |
106 | data += dm->length; |
107 | while ((data - buf < len - 1) && (data[0] || data[1])) | |
1da177e4 | 108 | data++; |
1249c513 | 109 | if (data - buf < len - 1) |
e7a19c56 | 110 | decode(dm, private_data); |
1249c513 | 111 | data += 2; |
1da177e4 LT |
112 | i++; |
113 | } | |
7fce084a JD |
114 | } |
115 | ||
fc430262 | 116 | static phys_addr_t dmi_base; |
7fce084a JD |
117 | static u16 dmi_len; |
118 | static u16 dmi_num; | |
119 | ||
e7a19c56 JD |
120 | static int __init dmi_walk_early(void (*decode)(const struct dmi_header *, |
121 | void *)) | |
7fce084a JD |
122 | { |
123 | u8 *buf; | |
124 | ||
cf074402 | 125 | buf = dmi_early_remap(dmi_base, dmi_len); |
7fce084a JD |
126 | if (buf == NULL) |
127 | return -1; | |
128 | ||
e7a19c56 | 129 | dmi_table(buf, dmi_len, dmi_num, decode, NULL); |
7fce084a | 130 | |
d114a333 TL |
131 | add_device_randomness(buf, dmi_len); |
132 | ||
cf074402 | 133 | dmi_early_unmap(buf, dmi_len); |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
9f9c9cbb | 137 | static int __init dmi_checksum(const u8 *buf, u8 len) |
1da177e4 | 138 | { |
1249c513 | 139 | u8 sum = 0; |
1da177e4 | 140 | int a; |
4f705ae3 | 141 | |
9f9c9cbb | 142 | for (a = 0; a < len; a++) |
1249c513 AP |
143 | sum += buf[a]; |
144 | ||
145 | return sum == 0; | |
1da177e4 LT |
146 | } |
147 | ||
ffbbb96d | 148 | static const char *dmi_ident[DMI_STRING_MAX]; |
ebad6a42 | 149 | static LIST_HEAD(dmi_devices); |
4f5c791a | 150 | int dmi_available; |
1da177e4 LT |
151 | |
152 | /* | |
153 | * Save a DMI string | |
154 | */ | |
02d9c47f JD |
155 | static void __init dmi_save_ident(const struct dmi_header *dm, int slot, |
156 | int string) | |
1da177e4 | 157 | { |
02d9c47f | 158 | const char *d = (const char *) dm; |
ffbbb96d | 159 | const char *p; |
1249c513 | 160 | |
1da177e4 LT |
161 | if (dmi_ident[slot]) |
162 | return; | |
1249c513 | 163 | |
c3c7120d AP |
164 | p = dmi_string(dm, d[string]); |
165 | if (p == NULL) | |
166 | return; | |
167 | ||
168 | dmi_ident[slot] = p; | |
1da177e4 LT |
169 | } |
170 | ||
02d9c47f JD |
171 | static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, |
172 | int index) | |
4f5c791a | 173 | { |
02d9c47f | 174 | const u8 *d = (u8 *) dm + index; |
4f5c791a LP |
175 | char *s; |
176 | int is_ff = 1, is_00 = 1, i; | |
177 | ||
178 | if (dmi_ident[slot]) | |
179 | return; | |
180 | ||
181 | for (i = 0; i < 16 && (is_ff || is_00); i++) { | |
f1d8e614 ZD |
182 | if (d[i] != 0x00) |
183 | is_00 = 0; | |
184 | if (d[i] != 0xFF) | |
185 | is_ff = 0; | |
4f5c791a LP |
186 | } |
187 | ||
188 | if (is_ff || is_00) | |
189 | return; | |
190 | ||
191 | s = dmi_alloc(16*2+4+1); | |
192 | if (!s) | |
193 | return; | |
194 | ||
f1d8e614 ZD |
195 | /* |
196 | * As of version 2.6 of the SMBIOS specification, the first 3 fields of | |
197 | * the UUID are supposed to be little-endian encoded. The specification | |
198 | * says that this is the defacto standard. | |
199 | */ | |
200 | if (dmi_ver >= 0x0206) | |
201 | sprintf(s, "%pUL", d); | |
202 | else | |
203 | sprintf(s, "%pUB", d); | |
4f5c791a | 204 | |
02d9c47f | 205 | dmi_ident[slot] = s; |
4f5c791a LP |
206 | } |
207 | ||
02d9c47f JD |
208 | static void __init dmi_save_type(const struct dmi_header *dm, int slot, |
209 | int index) | |
4f5c791a | 210 | { |
02d9c47f | 211 | const u8 *d = (u8 *) dm + index; |
4f5c791a LP |
212 | char *s; |
213 | ||
214 | if (dmi_ident[slot]) | |
215 | return; | |
216 | ||
217 | s = dmi_alloc(4); | |
218 | if (!s) | |
219 | return; | |
220 | ||
221 | sprintf(s, "%u", *d & 0x7F); | |
222 | dmi_ident[slot] = s; | |
223 | } | |
224 | ||
f3069ae9 JD |
225 | static void __init dmi_save_one_device(int type, const char *name) |
226 | { | |
227 | struct dmi_device *dev; | |
228 | ||
229 | /* No duplicate device */ | |
230 | if (dmi_find_device(type, name, NULL)) | |
231 | return; | |
232 | ||
233 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); | |
ae797449 | 234 | if (!dev) |
f3069ae9 | 235 | return; |
f3069ae9 JD |
236 | |
237 | dev->type = type; | |
238 | strcpy((char *)(dev + 1), name); | |
239 | dev->name = (char *)(dev + 1); | |
240 | dev->device_data = NULL; | |
241 | list_add(&dev->list, &dmi_devices); | |
242 | } | |
243 | ||
1855256c | 244 | static void __init dmi_save_devices(const struct dmi_header *dm) |
ebad6a42 AP |
245 | { |
246 | int i, count = (dm->length - sizeof(struct dmi_header)) / 2; | |
ebad6a42 AP |
247 | |
248 | for (i = 0; i < count; i++) { | |
1855256c | 249 | const char *d = (char *)(dm + 1) + (i * 2); |
ebad6a42 AP |
250 | |
251 | /* Skip disabled device */ | |
252 | if ((*d & 0x80) == 0) | |
253 | continue; | |
254 | ||
f3069ae9 | 255 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); |
2e0c1f6c SM |
256 | } |
257 | } | |
258 | ||
1855256c | 259 | static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) |
2e0c1f6c SM |
260 | { |
261 | int i, count = *(u8 *)(dm + 1); | |
262 | struct dmi_device *dev; | |
263 | ||
264 | for (i = 1; i <= count; i++) { | |
ffbbb96d | 265 | const char *devname = dmi_string(dm, i); |
79da4721 | 266 | |
43fe105a | 267 | if (devname == dmi_empty_string) |
79da4721 | 268 | continue; |
79da4721 | 269 | |
2e0c1f6c | 270 | dev = dmi_alloc(sizeof(*dev)); |
ae797449 | 271 | if (!dev) |
2e0c1f6c | 272 | break; |
2e0c1f6c SM |
273 | |
274 | dev->type = DMI_DEV_TYPE_OEM_STRING; | |
79da4721 | 275 | dev->name = devname; |
2e0c1f6c | 276 | dev->device_data = NULL; |
ebad6a42 AP |
277 | |
278 | list_add(&dev->list, &dmi_devices); | |
279 | } | |
280 | } | |
281 | ||
1855256c | 282 | static void __init dmi_save_ipmi_device(const struct dmi_header *dm) |
ebad6a42 AP |
283 | { |
284 | struct dmi_device *dev; | |
02d9c47f | 285 | void *data; |
ebad6a42 | 286 | |
e9928674 | 287 | data = dmi_alloc(dm->length); |
ae797449 | 288 | if (data == NULL) |
ebad6a42 | 289 | return; |
ebad6a42 AP |
290 | |
291 | memcpy(data, dm, dm->length); | |
292 | ||
e9928674 | 293 | dev = dmi_alloc(sizeof(*dev)); |
ae797449 | 294 | if (!dev) |
ebad6a42 | 295 | return; |
ebad6a42 AP |
296 | |
297 | dev->type = DMI_DEV_TYPE_IPMI; | |
298 | dev->name = "IPMI controller"; | |
299 | dev->device_data = data; | |
300 | ||
abd24df8 | 301 | list_add_tail(&dev->list, &dmi_devices); |
ebad6a42 AP |
302 | } |
303 | ||
911e1c9b N |
304 | static void __init dmi_save_dev_onboard(int instance, int segment, int bus, |
305 | int devfn, const char *name) | |
306 | { | |
307 | struct dmi_dev_onboard *onboard_dev; | |
308 | ||
309 | onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1); | |
ae797449 | 310 | if (!onboard_dev) |
911e1c9b | 311 | return; |
ae797449 | 312 | |
911e1c9b N |
313 | onboard_dev->instance = instance; |
314 | onboard_dev->segment = segment; | |
315 | onboard_dev->bus = bus; | |
316 | onboard_dev->devfn = devfn; | |
317 | ||
318 | strcpy((char *)&onboard_dev[1], name); | |
319 | onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD; | |
320 | onboard_dev->dev.name = (char *)&onboard_dev[1]; | |
321 | onboard_dev->dev.device_data = onboard_dev; | |
322 | ||
323 | list_add(&onboard_dev->dev.list, &dmi_devices); | |
324 | } | |
325 | ||
b4bd7d59 WVS |
326 | static void __init dmi_save_extended_devices(const struct dmi_header *dm) |
327 | { | |
02d9c47f | 328 | const u8 *d = (u8 *) dm + 5; |
b4bd7d59 WVS |
329 | |
330 | /* Skip disabled device */ | |
331 | if ((*d & 0x80) == 0) | |
332 | return; | |
333 | ||
911e1c9b N |
334 | dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5), |
335 | dmi_string_nosave(dm, *(d-1))); | |
f3069ae9 | 336 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); |
b4bd7d59 WVS |
337 | } |
338 | ||
dd6dad42 CG |
339 | static void __init count_mem_devices(const struct dmi_header *dm, void *v) |
340 | { | |
341 | if (dm->type != DMI_ENTRY_MEM_DEVICE) | |
342 | return; | |
343 | dmi_memdev_nr++; | |
344 | } | |
345 | ||
346 | static void __init save_mem_devices(const struct dmi_header *dm, void *v) | |
347 | { | |
348 | const char *d = (const char *)dm; | |
349 | static int nr; | |
350 | ||
351 | if (dm->type != DMI_ENTRY_MEM_DEVICE) | |
352 | return; | |
353 | if (nr >= dmi_memdev_nr) { | |
354 | pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n"); | |
355 | return; | |
356 | } | |
0841c04d | 357 | dmi_memdev[nr].handle = get_unaligned(&dm->handle); |
dd6dad42 CG |
358 | dmi_memdev[nr].device = dmi_string(dm, d[0x10]); |
359 | dmi_memdev[nr].bank = dmi_string(dm, d[0x11]); | |
360 | nr++; | |
361 | } | |
362 | ||
363 | void __init dmi_memdev_walk(void) | |
364 | { | |
365 | if (!dmi_available) | |
366 | return; | |
367 | ||
368 | if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) { | |
369 | dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr); | |
370 | if (dmi_memdev) | |
371 | dmi_walk_early(save_mem_devices); | |
372 | } | |
373 | } | |
374 | ||
1da177e4 LT |
375 | /* |
376 | * Process a DMI table entry. Right now all we care about are the BIOS | |
377 | * and machine entries. For 2.5 we should pull the smbus controller info | |
378 | * out of here. | |
379 | */ | |
e7a19c56 | 380 | static void __init dmi_decode(const struct dmi_header *dm, void *dummy) |
1da177e4 | 381 | { |
02d9c47f | 382 | switch (dm->type) { |
ebad6a42 | 383 | case 0: /* BIOS Information */ |
1249c513 | 384 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
1249c513 | 385 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
1249c513 AP |
386 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
387 | break; | |
ebad6a42 | 388 | case 1: /* System Information */ |
1249c513 | 389 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
1249c513 | 390 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
1249c513 | 391 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
1249c513 | 392 | dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); |
4f5c791a | 393 | dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); |
1249c513 | 394 | break; |
ebad6a42 | 395 | case 2: /* Base Board Information */ |
1249c513 | 396 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
1249c513 | 397 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
1249c513 | 398 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
4f5c791a LP |
399 | dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); |
400 | dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); | |
401 | break; | |
402 | case 3: /* Chassis Information */ | |
403 | dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); | |
404 | dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); | |
405 | dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); | |
406 | dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); | |
407 | dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); | |
1249c513 | 408 | break; |
ebad6a42 AP |
409 | case 10: /* Onboard Devices Information */ |
410 | dmi_save_devices(dm); | |
411 | break; | |
2e0c1f6c SM |
412 | case 11: /* OEM Strings */ |
413 | dmi_save_oem_strings_devices(dm); | |
414 | break; | |
ebad6a42 AP |
415 | case 38: /* IPMI Device Information */ |
416 | dmi_save_ipmi_device(dm); | |
b4bd7d59 WVS |
417 | break; |
418 | case 41: /* Onboard Devices Extended Information */ | |
419 | dmi_save_extended_devices(dm); | |
1da177e4 LT |
420 | } |
421 | } | |
422 | ||
c90fe6bc | 423 | static int __init print_filtered(char *buf, size_t len, const char *info) |
8881cdce | 424 | { |
c90fe6bc | 425 | int c = 0; |
8881cdce BH |
426 | const char *p; |
427 | ||
428 | if (!info) | |
c90fe6bc | 429 | return c; |
8881cdce BH |
430 | |
431 | for (p = info; *p; p++) | |
432 | if (isprint(*p)) | |
c90fe6bc | 433 | c += scnprintf(buf + c, len - c, "%c", *p); |
8881cdce | 434 | else |
c90fe6bc TH |
435 | c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff); |
436 | return c; | |
8881cdce BH |
437 | } |
438 | ||
c90fe6bc | 439 | static void __init dmi_format_ids(char *buf, size_t len) |
8881cdce | 440 | { |
c90fe6bc | 441 | int c = 0; |
84e383b3 NC |
442 | const char *board; /* Board Name is optional */ |
443 | ||
c90fe6bc TH |
444 | c += print_filtered(buf + c, len - c, |
445 | dmi_get_system_info(DMI_SYS_VENDOR)); | |
446 | c += scnprintf(buf + c, len - c, " "); | |
447 | c += print_filtered(buf + c, len - c, | |
448 | dmi_get_system_info(DMI_PRODUCT_NAME)); | |
449 | ||
84e383b3 NC |
450 | board = dmi_get_system_info(DMI_BOARD_NAME); |
451 | if (board) { | |
c90fe6bc TH |
452 | c += scnprintf(buf + c, len - c, "/"); |
453 | c += print_filtered(buf + c, len - c, board); | |
84e383b3 | 454 | } |
c90fe6bc TH |
455 | c += scnprintf(buf + c, len - c, ", BIOS "); |
456 | c += print_filtered(buf + c, len - c, | |
457 | dmi_get_system_info(DMI_BIOS_VERSION)); | |
458 | c += scnprintf(buf + c, len - c, " "); | |
459 | c += print_filtered(buf + c, len - c, | |
460 | dmi_get_system_info(DMI_BIOS_DATE)); | |
8881cdce BH |
461 | } |
462 | ||
d39de28c BH |
463 | /* |
464 | * Check for DMI/SMBIOS headers in the system firmware image. Any | |
465 | * SMBIOS header must start 16 bytes before the DMI header, so take a | |
466 | * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset | |
467 | * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS | |
468 | * takes precedence) and return 0. Otherwise return 1. | |
469 | */ | |
79bae42d | 470 | static int __init dmi_present(const u8 *buf) |
1da177e4 | 471 | { |
79bae42d | 472 | int smbios_ver; |
1855256c | 473 | |
79bae42d BH |
474 | if (memcmp(buf, "_SM_", 4) == 0 && |
475 | buf[5] < 32 && dmi_checksum(buf, buf[5])) { | |
fc430262 | 476 | smbios_ver = get_unaligned_be16(buf + 6); |
79bae42d BH |
477 | |
478 | /* Some BIOS report weird SMBIOS version, fix that up */ | |
479 | switch (smbios_ver) { | |
480 | case 0x021F: | |
481 | case 0x0221: | |
482 | pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", | |
483 | smbios_ver & 0xFF, 3); | |
484 | smbios_ver = 0x0203; | |
485 | break; | |
486 | case 0x0233: | |
487 | pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6); | |
488 | smbios_ver = 0x0206; | |
489 | break; | |
490 | } | |
491 | } else { | |
492 | smbios_ver = 0; | |
493 | } | |
494 | ||
495 | buf += 16; | |
496 | ||
497 | if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) { | |
fc430262 AB |
498 | dmi_num = get_unaligned_le16(buf + 12); |
499 | dmi_len = get_unaligned_le16(buf + 6); | |
500 | dmi_base = get_unaligned_le32(buf + 8); | |
61e032fa | 501 | |
8881cdce | 502 | if (dmi_walk_early(dmi_decode) == 0) { |
79bae42d BH |
503 | if (smbios_ver) { |
504 | dmi_ver = smbios_ver; | |
9f9c9cbb ZD |
505 | pr_info("SMBIOS %d.%d present.\n", |
506 | dmi_ver >> 8, dmi_ver & 0xFF); | |
79bae42d | 507 | } else { |
9f9c9cbb ZD |
508 | dmi_ver = (buf[14] & 0xF0) << 4 | |
509 | (buf[14] & 0x0F); | |
510 | pr_info("Legacy DMI %d.%d present.\n", | |
511 | dmi_ver >> 8, dmi_ver & 0xFF); | |
512 | } | |
c90fe6bc TH |
513 | dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); |
514 | printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string); | |
3ed3bce8 | 515 | return 0; |
8881cdce | 516 | } |
3ed3bce8 | 517 | } |
61e032fa | 518 | |
a40e7cf8 | 519 | return 1; |
9f9c9cbb ZD |
520 | } |
521 | ||
fc430262 AB |
522 | /* |
523 | * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy | |
524 | * 32-bit entry point, there is no embedded DMI header (_DMI_) in here. | |
525 | */ | |
526 | static int __init dmi_smbios3_present(const u8 *buf) | |
527 | { | |
528 | if (memcmp(buf, "_SM3_", 5) == 0 && | |
529 | buf[6] < 32 && dmi_checksum(buf, buf[6])) { | |
530 | dmi_ver = get_unaligned_be16(buf + 7); | |
531 | dmi_len = get_unaligned_le32(buf + 12); | |
532 | dmi_base = get_unaligned_le64(buf + 16); | |
533 | ||
534 | /* | |
535 | * The 64-bit SMBIOS 3.0 entry point no longer has a field | |
536 | * containing the number of structures present in the table. | |
537 | * Instead, it defines the table size as a maximum size, and | |
538 | * relies on the end-of-table structure type (#127) to be used | |
539 | * to signal the end of the table. | |
540 | * So let's define dmi_num as an upper bound as well: each | |
541 | * structure has a 4 byte header, so dmi_len / 4 is an upper | |
542 | * bound for the number of structures in the table. | |
543 | */ | |
544 | dmi_num = dmi_len / 4; | |
545 | ||
546 | if (dmi_walk_early(dmi_decode) == 0) { | |
547 | pr_info("SMBIOS %d.%d present.\n", | |
548 | dmi_ver >> 8, dmi_ver & 0xFF); | |
549 | dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); | |
550 | pr_debug("DMI: %s\n", dmi_ids_string); | |
551 | return 0; | |
552 | } | |
553 | } | |
554 | return 1; | |
555 | } | |
556 | ||
3ed3bce8 MD |
557 | void __init dmi_scan_machine(void) |
558 | { | |
559 | char __iomem *p, *q; | |
79bae42d | 560 | char buf[32]; |
3ed3bce8 | 561 | |
83e68189 | 562 | if (efi_enabled(EFI_CONFIG_TABLES)) { |
fc430262 AB |
563 | /* |
564 | * According to the DMTF SMBIOS reference spec v3.0.0, it is | |
565 | * allowed to define both the 64-bit entry point (smbios3) and | |
566 | * the 32-bit entry point (smbios), in which case they should | |
567 | * either both point to the same SMBIOS structure table, or the | |
568 | * table pointed to by the 64-bit entry point should contain a | |
569 | * superset of the table contents pointed to by the 32-bit entry | |
570 | * point (section 5.2) | |
571 | * This implies that the 64-bit entry point should have | |
572 | * precedence if it is defined and supported by the OS. If we | |
573 | * have the 64-bit entry point, but fail to decode it, fall | |
574 | * back to the legacy one (if available) | |
575 | */ | |
576 | if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) { | |
577 | p = dmi_early_remap(efi.smbios3, 32); | |
578 | if (p == NULL) | |
579 | goto error; | |
580 | memcpy_fromio(buf, p, 32); | |
581 | dmi_early_unmap(p, 32); | |
582 | ||
583 | if (!dmi_smbios3_present(buf)) { | |
584 | dmi_available = 1; | |
585 | goto out; | |
586 | } | |
587 | } | |
b2c99e3c | 588 | if (efi.smbios == EFI_INVALID_TABLE_ADDR) |
9a22b6e7 | 589 | goto error; |
3ed3bce8 | 590 | |
4f5c791a LP |
591 | /* This is called as a core_initcall() because it isn't |
592 | * needed during early boot. This also means we can | |
593 | * iounmap the space when we're done with it. | |
594 | */ | |
cf074402 | 595 | p = dmi_early_remap(efi.smbios, 32); |
3ed3bce8 | 596 | if (p == NULL) |
9a22b6e7 | 597 | goto error; |
79bae42d | 598 | memcpy_fromio(buf, p, 32); |
cf074402 | 599 | dmi_early_unmap(p, 32); |
79bae42d BH |
600 | |
601 | if (!dmi_present(buf)) { | |
4f5c791a | 602 | dmi_available = 1; |
9a22b6e7 | 603 | goto out; |
4f5c791a | 604 | } |
cf074402 AB |
605 | } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) { |
606 | p = dmi_early_remap(0xF0000, 0x10000); | |
3ed3bce8 | 607 | if (p == NULL) |
9a22b6e7 | 608 | goto error; |
3ed3bce8 | 609 | |
d39de28c BH |
610 | /* |
611 | * Iterate over all possible DMI header addresses q. | |
612 | * Maintain the 32 bytes around q in buf. On the | |
613 | * first iteration, substitute zero for the | |
614 | * out-of-range bytes so there is no chance of falsely | |
615 | * detecting an SMBIOS header. | |
616 | */ | |
79bae42d | 617 | memset(buf, 0, 16); |
3ed3bce8 | 618 | for (q = p; q < p + 0x10000; q += 16) { |
79bae42d | 619 | memcpy_fromio(buf + 16, q, 16); |
fc430262 | 620 | if (!dmi_smbios3_present(buf) || !dmi_present(buf)) { |
4f5c791a | 621 | dmi_available = 1; |
cf074402 | 622 | dmi_early_unmap(p, 0x10000); |
9a22b6e7 | 623 | goto out; |
4f5c791a | 624 | } |
79bae42d | 625 | memcpy(buf, buf + 16, 16); |
61e032fa | 626 | } |
cf074402 | 627 | dmi_early_unmap(p, 0x10000); |
61e032fa | 628 | } |
9a22b6e7 | 629 | error: |
02d9c47f | 630 | pr_info("DMI not present or invalid.\n"); |
9a22b6e7 IM |
631 | out: |
632 | dmi_initialized = 1; | |
1da177e4 LT |
633 | } |
634 | ||
98e5e1bf TH |
635 | /** |
636 | * dmi_set_dump_stack_arch_desc - set arch description for dump_stack() | |
637 | * | |
638 | * Invoke dump_stack_set_arch_desc() with DMI system information so that | |
639 | * DMI identifiers are printed out on task dumps. Arch boot code should | |
640 | * call this function after dmi_scan_machine() if it wants to print out DMI | |
641 | * identifiers on task dumps. | |
642 | */ | |
643 | void __init dmi_set_dump_stack_arch_desc(void) | |
644 | { | |
645 | dump_stack_set_arch_desc("%s", dmi_ids_string); | |
646 | } | |
647 | ||
d7b1956f RW |
648 | /** |
649 | * dmi_matches - check if dmi_system_id structure matches system DMI data | |
650 | * @dmi: pointer to the dmi_system_id structure to check | |
651 | */ | |
652 | static bool dmi_matches(const struct dmi_system_id *dmi) | |
653 | { | |
654 | int i; | |
655 | ||
656 | WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n"); | |
657 | ||
658 | for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) { | |
659 | int s = dmi->matches[i].slot; | |
660 | if (s == DMI_NONE) | |
75757507 | 661 | break; |
5017b285 JN |
662 | if (dmi_ident[s]) { |
663 | if (!dmi->matches[i].exact_match && | |
664 | strstr(dmi_ident[s], dmi->matches[i].substr)) | |
665 | continue; | |
666 | else if (dmi->matches[i].exact_match && | |
667 | !strcmp(dmi_ident[s], dmi->matches[i].substr)) | |
668 | continue; | |
669 | } | |
670 | ||
d7b1956f RW |
671 | /* No match */ |
672 | return false; | |
673 | } | |
674 | return true; | |
675 | } | |
676 | ||
75757507 DT |
677 | /** |
678 | * dmi_is_end_of_table - check for end-of-table marker | |
679 | * @dmi: pointer to the dmi_system_id structure to check | |
680 | */ | |
681 | static bool dmi_is_end_of_table(const struct dmi_system_id *dmi) | |
682 | { | |
683 | return dmi->matches[0].slot == DMI_NONE; | |
684 | } | |
685 | ||
1da177e4 LT |
686 | /** |
687 | * dmi_check_system - check system DMI data | |
688 | * @list: array of dmi_system_id structures to match against | |
b0ef371e RD |
689 | * All non-null elements of the list must match |
690 | * their slot's (field index's) data (i.e., each | |
691 | * list string must be a substring of the specified | |
692 | * DMI slot's string data) to be considered a | |
693 | * successful match. | |
1da177e4 LT |
694 | * |
695 | * Walk the blacklist table running matching functions until someone | |
696 | * returns non zero or we hit the end. Callback function is called for | |
b0ef371e | 697 | * each successful match. Returns the number of matches. |
1da177e4 | 698 | */ |
1855256c | 699 | int dmi_check_system(const struct dmi_system_id *list) |
1da177e4 | 700 | { |
d7b1956f RW |
701 | int count = 0; |
702 | const struct dmi_system_id *d; | |
703 | ||
75757507 | 704 | for (d = list; !dmi_is_end_of_table(d); d++) |
d7b1956f RW |
705 | if (dmi_matches(d)) { |
706 | count++; | |
707 | if (d->callback && d->callback(d)) | |
708 | break; | |
1da177e4 | 709 | } |
1da177e4 LT |
710 | |
711 | return count; | |
712 | } | |
1da177e4 LT |
713 | EXPORT_SYMBOL(dmi_check_system); |
714 | ||
d7b1956f RW |
715 | /** |
716 | * dmi_first_match - find dmi_system_id structure matching system DMI data | |
717 | * @list: array of dmi_system_id structures to match against | |
718 | * All non-null elements of the list must match | |
719 | * their slot's (field index's) data (i.e., each | |
720 | * list string must be a substring of the specified | |
721 | * DMI slot's string data) to be considered a | |
722 | * successful match. | |
723 | * | |
724 | * Walk the blacklist table until the first match is found. Return the | |
725 | * pointer to the matching entry or NULL if there's no match. | |
726 | */ | |
727 | const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list) | |
728 | { | |
729 | const struct dmi_system_id *d; | |
730 | ||
75757507 | 731 | for (d = list; !dmi_is_end_of_table(d); d++) |
d7b1956f RW |
732 | if (dmi_matches(d)) |
733 | return d; | |
734 | ||
735 | return NULL; | |
736 | } | |
737 | EXPORT_SYMBOL(dmi_first_match); | |
738 | ||
1da177e4 LT |
739 | /** |
740 | * dmi_get_system_info - return DMI data value | |
b0ef371e | 741 | * @field: data index (see enum dmi_field) |
1da177e4 LT |
742 | * |
743 | * Returns one DMI data value, can be used to perform | |
744 | * complex DMI data checks. | |
745 | */ | |
1855256c | 746 | const char *dmi_get_system_info(int field) |
1da177e4 LT |
747 | { |
748 | return dmi_ident[field]; | |
749 | } | |
e70c9d5e | 750 | EXPORT_SYMBOL(dmi_get_system_info); |
ebad6a42 | 751 | |
fd8cd7e1 | 752 | /** |
c2bacfc4 RD |
753 | * dmi_name_in_serial - Check if string is in the DMI product serial information |
754 | * @str: string to check for | |
fd8cd7e1 AK |
755 | */ |
756 | int dmi_name_in_serial(const char *str) | |
757 | { | |
758 | int f = DMI_PRODUCT_SERIAL; | |
759 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
760 | return 1; | |
761 | return 0; | |
762 | } | |
a1bae672 AK |
763 | |
764 | /** | |
66e13e66 | 765 | * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name |
02d9c47f | 766 | * @str: Case sensitive Name |
a1bae672 | 767 | */ |
1855256c | 768 | int dmi_name_in_vendors(const char *str) |
a1bae672 | 769 | { |
66e13e66 | 770 | static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE }; |
a1bae672 AK |
771 | int i; |
772 | for (i = 0; fields[i] != DMI_NONE; i++) { | |
773 | int f = fields[i]; | |
774 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
775 | return 1; | |
776 | } | |
777 | return 0; | |
778 | } | |
779 | EXPORT_SYMBOL(dmi_name_in_vendors); | |
780 | ||
ebad6a42 AP |
781 | /** |
782 | * dmi_find_device - find onboard device by type/name | |
783 | * @type: device type or %DMI_DEV_TYPE_ANY to match all device types | |
b0ef371e | 784 | * @name: device name string or %NULL to match all |
ebad6a42 AP |
785 | * @from: previous device found in search, or %NULL for new search. |
786 | * | |
787 | * Iterates through the list of known onboard devices. If a device is | |
788 | * found with a matching @vendor and @device, a pointer to its device | |
789 | * structure is returned. Otherwise, %NULL is returned. | |
b0ef371e | 790 | * A new search is initiated by passing %NULL as the @from argument. |
ebad6a42 AP |
791 | * If @from is not %NULL, searches continue from next device. |
792 | */ | |
02d9c47f | 793 | const struct dmi_device *dmi_find_device(int type, const char *name, |
1855256c | 794 | const struct dmi_device *from) |
ebad6a42 | 795 | { |
1855256c JG |
796 | const struct list_head *head = from ? &from->list : &dmi_devices; |
797 | struct list_head *d; | |
ebad6a42 | 798 | |
02d9c47f | 799 | for (d = head->next; d != &dmi_devices; d = d->next) { |
1855256c JG |
800 | const struct dmi_device *dev = |
801 | list_entry(d, struct dmi_device, list); | |
ebad6a42 AP |
802 | |
803 | if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && | |
804 | ((name == NULL) || (strcmp(dev->name, name) == 0))) | |
805 | return dev; | |
806 | } | |
807 | ||
808 | return NULL; | |
809 | } | |
810 | EXPORT_SYMBOL(dmi_find_device); | |
f083a329 AK |
811 | |
812 | /** | |
3e5cd1f2 TH |
813 | * dmi_get_date - parse a DMI date |
814 | * @field: data index (see enum dmi_field) | |
815 | * @yearp: optional out parameter for the year | |
816 | * @monthp: optional out parameter for the month | |
817 | * @dayp: optional out parameter for the day | |
f083a329 | 818 | * |
3e5cd1f2 TH |
819 | * The date field is assumed to be in the form resembling |
820 | * [mm[/dd]]/yy[yy] and the result is stored in the out | |
821 | * parameters any or all of which can be omitted. | |
822 | * | |
823 | * If the field doesn't exist, all out parameters are set to zero | |
824 | * and false is returned. Otherwise, true is returned with any | |
825 | * invalid part of date set to zero. | |
826 | * | |
827 | * On return, year, month and day are guaranteed to be in the | |
828 | * range of [0,9999], [0,12] and [0,31] respectively. | |
f083a329 | 829 | */ |
3e5cd1f2 | 830 | bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp) |
f083a329 | 831 | { |
3e5cd1f2 TH |
832 | int year = 0, month = 0, day = 0; |
833 | bool exists; | |
834 | const char *s, *y; | |
02c24fa8 | 835 | char *e; |
f083a329 | 836 | |
3e5cd1f2 TH |
837 | s = dmi_get_system_info(field); |
838 | exists = s; | |
839 | if (!exists) | |
840 | goto out; | |
f083a329 | 841 | |
3e5cd1f2 TH |
842 | /* |
843 | * Determine year first. We assume the date string resembles | |
844 | * mm/dd/yy[yy] but the original code extracted only the year | |
845 | * from the end. Keep the behavior in the spirit of no | |
846 | * surprises. | |
847 | */ | |
848 | y = strrchr(s, '/'); | |
849 | if (!y) | |
850 | goto out; | |
851 | ||
852 | y++; | |
853 | year = simple_strtoul(y, &e, 10); | |
854 | if (y != e && year < 100) { /* 2-digit year */ | |
f083a329 AK |
855 | year += 1900; |
856 | if (year < 1996) /* no dates < spec 1.0 */ | |
857 | year += 100; | |
858 | } | |
3e5cd1f2 TH |
859 | if (year > 9999) /* year should fit in %04d */ |
860 | year = 0; | |
861 | ||
862 | /* parse the mm and dd */ | |
863 | month = simple_strtoul(s, &e, 10); | |
864 | if (s == e || *e != '/' || !month || month > 12) { | |
865 | month = 0; | |
866 | goto out; | |
867 | } | |
f083a329 | 868 | |
3e5cd1f2 TH |
869 | s = e + 1; |
870 | day = simple_strtoul(s, &e, 10); | |
871 | if (s == y || s == e || *e != '/' || day > 31) | |
872 | day = 0; | |
873 | out: | |
874 | if (yearp) | |
875 | *yearp = year; | |
876 | if (monthp) | |
877 | *monthp = month; | |
878 | if (dayp) | |
879 | *dayp = day; | |
880 | return exists; | |
f083a329 | 881 | } |
3e5cd1f2 | 882 | EXPORT_SYMBOL(dmi_get_date); |
7fce084a JD |
883 | |
884 | /** | |
885 | * dmi_walk - Walk the DMI table and get called back for every record | |
886 | * @decode: Callback function | |
e7a19c56 | 887 | * @private_data: Private data to be passed to the callback function |
7fce084a JD |
888 | * |
889 | * Returns -1 when the DMI table can't be reached, 0 on success. | |
890 | */ | |
e7a19c56 JD |
891 | int dmi_walk(void (*decode)(const struct dmi_header *, void *), |
892 | void *private_data) | |
7fce084a JD |
893 | { |
894 | u8 *buf; | |
895 | ||
896 | if (!dmi_available) | |
897 | return -1; | |
898 | ||
cf074402 | 899 | buf = dmi_remap(dmi_base, dmi_len); |
7fce084a JD |
900 | if (buf == NULL) |
901 | return -1; | |
902 | ||
e7a19c56 | 903 | dmi_table(buf, dmi_len, dmi_num, decode, private_data); |
7fce084a | 904 | |
cf074402 | 905 | dmi_unmap(buf); |
7fce084a JD |
906 | return 0; |
907 | } | |
908 | EXPORT_SYMBOL_GPL(dmi_walk); | |
d61c72e5 JS |
909 | |
910 | /** | |
911 | * dmi_match - compare a string to the dmi field (if exists) | |
c2bacfc4 RD |
912 | * @f: DMI field identifier |
913 | * @str: string to compare the DMI field to | |
d61c72e5 JS |
914 | * |
915 | * Returns true if the requested field equals to the str (including NULL). | |
916 | */ | |
917 | bool dmi_match(enum dmi_field f, const char *str) | |
918 | { | |
919 | const char *info = dmi_get_system_info(f); | |
920 | ||
921 | if (info == NULL || str == NULL) | |
922 | return info == str; | |
923 | ||
924 | return !strcmp(info, str); | |
925 | } | |
926 | EXPORT_SYMBOL_GPL(dmi_match); | |
dd6dad42 CG |
927 | |
928 | void dmi_memdev_name(u16 handle, const char **bank, const char **device) | |
929 | { | |
930 | int n; | |
931 | ||
932 | if (dmi_memdev == NULL) | |
933 | return; | |
934 | ||
935 | for (n = 0; n < dmi_memdev_nr; n++) { | |
936 | if (handle == dmi_memdev[n].handle) { | |
937 | *bank = dmi_memdev[n].bank; | |
938 | *device = dmi_memdev[n].device; | |
939 | break; | |
940 | } | |
941 | } | |
942 | } | |
943 | EXPORT_SYMBOL_GPL(dmi_memdev_name); |