Commit | Line | Data |
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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 | 2 | #include <linux/types.h> |
1da177e4 LT |
3 | #include <linux/string.h> |
4 | #include <linux/init.h> | |
5 | #include <linux/module.h> | |
8881cdce | 6 | #include <linux/ctype.h> |
1da177e4 | 7 | #include <linux/dmi.h> |
3ed3bce8 | 8 | #include <linux/efi.h> |
57c8a661 | 9 | #include <linux/memblock.h> |
d114a333 | 10 | #include <linux/random.h> |
f2d3efed | 11 | #include <asm/dmi.h> |
0841c04d | 12 | #include <asm/unaligned.h> |
1da177e4 | 13 | |
d7f96f97 IK |
14 | struct kobject *dmi_kobj; |
15 | EXPORT_SYMBOL_GPL(dmi_kobj); | |
16 | ||
cb5dd7c1 PJ |
17 | /* |
18 | * DMI stands for "Desktop Management Interface". It is part | |
19 | * of and an antecedent to, SMBIOS, which stands for System | |
20 | * Management BIOS. See further: http://www.dmtf.org/standards | |
21 | */ | |
a7770ae1 | 22 | static const char dmi_empty_string[] = ""; |
79da4721 | 23 | |
95be58df | 24 | static u32 dmi_ver __initdata; |
552e19d8 IK |
25 | static u32 dmi_len; |
26 | static u16 dmi_num; | |
d7f96f97 IK |
27 | static u8 smbios_entry_point[32]; |
28 | static int smbios_entry_point_size; | |
29 | ||
c90fe6bc TH |
30 | /* DMI system identification string used during boot */ |
31 | static char dmi_ids_string[128] __initdata; | |
32 | ||
dd6dad42 CG |
33 | static struct dmi_memdev_info { |
34 | const char *device; | |
35 | const char *bank; | |
6deae96b | 36 | u64 size; /* bytes */ |
dd6dad42 CG |
37 | u16 handle; |
38 | } *dmi_memdev; | |
39 | static int dmi_memdev_nr; | |
40 | ||
f3069ae9 | 41 | static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) |
1da177e4 | 42 | { |
1855256c | 43 | const u8 *bp = ((u8 *) dm) + dm->length; |
a7770ae1 | 44 | const u8 *nsp; |
1249c513 | 45 | |
c3c7120d | 46 | if (s) { |
a7770ae1 | 47 | while (--s > 0 && *bp) |
c3c7120d | 48 | bp += strlen(bp) + 1; |
c3c7120d | 49 | |
a7770ae1 JD |
50 | /* Strings containing only spaces are considered empty */ |
51 | nsp = bp; | |
52 | while (*nsp == ' ') | |
53 | nsp++; | |
54 | if (*nsp != '\0') | |
f3069ae9 | 55 | return bp; |
4f705ae3 | 56 | } |
c3c7120d | 57 | |
a7770ae1 | 58 | return dmi_empty_string; |
f3069ae9 JD |
59 | } |
60 | ||
ffbbb96d | 61 | static const char * __init dmi_string(const struct dmi_header *dm, u8 s) |
f3069ae9 JD |
62 | { |
63 | const char *bp = dmi_string_nosave(dm, s); | |
64 | char *str; | |
65 | size_t len; | |
66 | ||
67 | if (bp == dmi_empty_string) | |
68 | return dmi_empty_string; | |
69 | ||
70 | len = strlen(bp) + 1; | |
71 | str = dmi_alloc(len); | |
72 | if (str != NULL) | |
73 | strcpy(str, bp); | |
f3069ae9 | 74 | |
c3c7120d | 75 | return str; |
1da177e4 LT |
76 | } |
77 | ||
78 | /* | |
79 | * We have to be cautious here. We have seen BIOSes with DMI pointers | |
80 | * pointing to completely the wrong place for example | |
81 | */ | |
eb4c5ea5 IK |
82 | static void dmi_decode_table(u8 *buf, |
83 | void (*decode)(const struct dmi_header *, void *), | |
84 | void *private_data) | |
1da177e4 | 85 | { |
7fce084a | 86 | u8 *data = buf; |
1249c513 | 87 | int i = 0; |
4f705ae3 | 88 | |
1da177e4 | 89 | /* |
bfbaafae | 90 | * Stop when we have seen all the items the table claimed to have |
17cd5bd5 JD |
91 | * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS |
92 | * >= 3.0 only) OR we run off the end of the table (should never | |
93 | * happen but sometimes does on bogus implementations.) | |
4f705ae3 | 94 | */ |
9c65e12a LT |
95 | while ((!dmi_num || i < dmi_num) && |
96 | (data - buf + sizeof(struct dmi_header)) <= dmi_len) { | |
1855256c JG |
97 | const struct dmi_header *dm = (const struct dmi_header *)data; |
98 | ||
1da177e4 | 99 | /* |
8638545c AC |
100 | * We want to know the total length (formatted area and |
101 | * strings) before decoding to make sure we won't run off the | |
102 | * table in dmi_decode or dmi_string | |
1da177e4 | 103 | */ |
1249c513 | 104 | data += dm->length; |
552e19d8 | 105 | while ((data - buf < dmi_len - 1) && (data[0] || data[1])) |
1da177e4 | 106 | data++; |
552e19d8 | 107 | if (data - buf < dmi_len - 1) |
e7a19c56 | 108 | decode(dm, private_data); |
ce204e9a | 109 | |
6e0ad59e JD |
110 | data += 2; |
111 | i++; | |
112 | ||
ce204e9a IK |
113 | /* |
114 | * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0] | |
17cd5bd5 JD |
115 | * For tables behind a 64-bit entry point, we have no item |
116 | * count and no exact table length, so stop on end-of-table | |
117 | * marker. For tables behind a 32-bit entry point, we have | |
118 | * seen OEM structures behind the end-of-table marker on | |
119 | * some systems, so don't trust it. | |
ce204e9a | 120 | */ |
17cd5bd5 | 121 | if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE) |
ce204e9a | 122 | break; |
1da177e4 | 123 | } |
6e0ad59e JD |
124 | |
125 | /* Trim DMI table length if needed */ | |
126 | if (dmi_len > data - buf) | |
127 | dmi_len = data - buf; | |
7fce084a JD |
128 | } |
129 | ||
fc430262 | 130 | static phys_addr_t dmi_base; |
7fce084a | 131 | |
e7a19c56 JD |
132 | static int __init dmi_walk_early(void (*decode)(const struct dmi_header *, |
133 | void *)) | |
7fce084a JD |
134 | { |
135 | u8 *buf; | |
6e0ad59e | 136 | u32 orig_dmi_len = dmi_len; |
7fce084a | 137 | |
6e0ad59e | 138 | buf = dmi_early_remap(dmi_base, orig_dmi_len); |
7fce084a | 139 | if (buf == NULL) |
c9268200 | 140 | return -ENOMEM; |
7fce084a | 141 | |
eb4c5ea5 | 142 | dmi_decode_table(buf, decode, NULL); |
7fce084a | 143 | |
d114a333 TL |
144 | add_device_randomness(buf, dmi_len); |
145 | ||
6e0ad59e | 146 | dmi_early_unmap(buf, orig_dmi_len); |
1da177e4 LT |
147 | return 0; |
148 | } | |
149 | ||
9f9c9cbb | 150 | static int __init dmi_checksum(const u8 *buf, u8 len) |
1da177e4 | 151 | { |
1249c513 | 152 | u8 sum = 0; |
1da177e4 | 153 | int a; |
4f705ae3 | 154 | |
9f9c9cbb | 155 | for (a = 0; a < len; a++) |
1249c513 AP |
156 | sum += buf[a]; |
157 | ||
158 | return sum == 0; | |
1da177e4 LT |
159 | } |
160 | ||
ffbbb96d | 161 | static const char *dmi_ident[DMI_STRING_MAX]; |
ebad6a42 | 162 | static LIST_HEAD(dmi_devices); |
4f5c791a | 163 | int dmi_available; |
1da177e4 LT |
164 | |
165 | /* | |
166 | * Save a DMI string | |
167 | */ | |
02d9c47f JD |
168 | static void __init dmi_save_ident(const struct dmi_header *dm, int slot, |
169 | int string) | |
1da177e4 | 170 | { |
02d9c47f | 171 | const char *d = (const char *) dm; |
ffbbb96d | 172 | const char *p; |
1249c513 | 173 | |
a814c359 | 174 | if (dmi_ident[slot] || dm->length <= string) |
1da177e4 | 175 | return; |
1249c513 | 176 | |
c3c7120d AP |
177 | p = dmi_string(dm, d[string]); |
178 | if (p == NULL) | |
179 | return; | |
180 | ||
181 | dmi_ident[slot] = p; | |
1da177e4 LT |
182 | } |
183 | ||
02d9c47f JD |
184 | static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, |
185 | int index) | |
4f5c791a | 186 | { |
a814c359 | 187 | const u8 *d; |
4f5c791a LP |
188 | char *s; |
189 | int is_ff = 1, is_00 = 1, i; | |
190 | ||
90fe6f8f | 191 | if (dmi_ident[slot] || dm->length < index + 16) |
4f5c791a LP |
192 | return; |
193 | ||
a814c359 | 194 | d = (u8 *) dm + index; |
4f5c791a | 195 | for (i = 0; i < 16 && (is_ff || is_00); i++) { |
f1d8e614 ZD |
196 | if (d[i] != 0x00) |
197 | is_00 = 0; | |
198 | if (d[i] != 0xFF) | |
199 | is_ff = 0; | |
4f5c791a LP |
200 | } |
201 | ||
202 | if (is_ff || is_00) | |
203 | return; | |
204 | ||
205 | s = dmi_alloc(16*2+4+1); | |
206 | if (!s) | |
207 | return; | |
208 | ||
f1d8e614 ZD |
209 | /* |
210 | * As of version 2.6 of the SMBIOS specification, the first 3 fields of | |
211 | * the UUID are supposed to be little-endian encoded. The specification | |
212 | * says that this is the defacto standard. | |
213 | */ | |
95be58df | 214 | if (dmi_ver >= 0x020600) |
712ff254 | 215 | sprintf(s, "%pUl", d); |
f1d8e614 | 216 | else |
712ff254 | 217 | sprintf(s, "%pUb", d); |
4f5c791a | 218 | |
02d9c47f | 219 | dmi_ident[slot] = s; |
4f5c791a LP |
220 | } |
221 | ||
02d9c47f JD |
222 | static void __init dmi_save_type(const struct dmi_header *dm, int slot, |
223 | int index) | |
4f5c791a | 224 | { |
a814c359 | 225 | const u8 *d; |
4f5c791a LP |
226 | char *s; |
227 | ||
a814c359 | 228 | if (dmi_ident[slot] || dm->length <= index) |
4f5c791a LP |
229 | return; |
230 | ||
231 | s = dmi_alloc(4); | |
232 | if (!s) | |
233 | return; | |
234 | ||
a814c359 | 235 | d = (u8 *) dm + index; |
4f5c791a LP |
236 | sprintf(s, "%u", *d & 0x7F); |
237 | dmi_ident[slot] = s; | |
238 | } | |
239 | ||
f3069ae9 JD |
240 | static void __init dmi_save_one_device(int type, const char *name) |
241 | { | |
242 | struct dmi_device *dev; | |
243 | ||
244 | /* No duplicate device */ | |
245 | if (dmi_find_device(type, name, NULL)) | |
246 | return; | |
247 | ||
248 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); | |
ae797449 | 249 | if (!dev) |
f3069ae9 | 250 | return; |
f3069ae9 JD |
251 | |
252 | dev->type = type; | |
253 | strcpy((char *)(dev + 1), name); | |
254 | dev->name = (char *)(dev + 1); | |
255 | dev->device_data = NULL; | |
256 | list_add(&dev->list, &dmi_devices); | |
257 | } | |
258 | ||
1855256c | 259 | static void __init dmi_save_devices(const struct dmi_header *dm) |
ebad6a42 AP |
260 | { |
261 | int i, count = (dm->length - sizeof(struct dmi_header)) / 2; | |
ebad6a42 AP |
262 | |
263 | for (i = 0; i < count; i++) { | |
1855256c | 264 | const char *d = (char *)(dm + 1) + (i * 2); |
ebad6a42 AP |
265 | |
266 | /* Skip disabled device */ | |
267 | if ((*d & 0x80) == 0) | |
268 | continue; | |
269 | ||
f3069ae9 | 270 | dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); |
2e0c1f6c SM |
271 | } |
272 | } | |
273 | ||
1855256c | 274 | static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) |
2e0c1f6c | 275 | { |
a814c359 | 276 | int i, count; |
2e0c1f6c SM |
277 | struct dmi_device *dev; |
278 | ||
a814c359 JD |
279 | if (dm->length < 0x05) |
280 | return; | |
281 | ||
282 | count = *(u8 *)(dm + 1); | |
2e0c1f6c | 283 | for (i = 1; i <= count; i++) { |
ffbbb96d | 284 | const char *devname = dmi_string(dm, i); |
79da4721 | 285 | |
43fe105a | 286 | if (devname == dmi_empty_string) |
79da4721 | 287 | continue; |
79da4721 | 288 | |
2e0c1f6c | 289 | dev = dmi_alloc(sizeof(*dev)); |
ae797449 | 290 | if (!dev) |
2e0c1f6c | 291 | break; |
2e0c1f6c SM |
292 | |
293 | dev->type = DMI_DEV_TYPE_OEM_STRING; | |
79da4721 | 294 | dev->name = devname; |
2e0c1f6c | 295 | dev->device_data = NULL; |
ebad6a42 AP |
296 | |
297 | list_add(&dev->list, &dmi_devices); | |
298 | } | |
299 | } | |
300 | ||
1855256c | 301 | static void __init dmi_save_ipmi_device(const struct dmi_header *dm) |
ebad6a42 AP |
302 | { |
303 | struct dmi_device *dev; | |
02d9c47f | 304 | void *data; |
ebad6a42 | 305 | |
e9928674 | 306 | data = dmi_alloc(dm->length); |
ae797449 | 307 | if (data == NULL) |
ebad6a42 | 308 | return; |
ebad6a42 AP |
309 | |
310 | memcpy(data, dm, dm->length); | |
311 | ||
e9928674 | 312 | dev = dmi_alloc(sizeof(*dev)); |
ae797449 | 313 | if (!dev) |
ebad6a42 | 314 | return; |
ebad6a42 AP |
315 | |
316 | dev->type = DMI_DEV_TYPE_IPMI; | |
317 | dev->name = "IPMI controller"; | |
318 | dev->device_data = data; | |
319 | ||
abd24df8 | 320 | list_add_tail(&dev->list, &dmi_devices); |
ebad6a42 AP |
321 | } |
322 | ||
e5b6c151 JH |
323 | static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus, |
324 | int devfn, const char *name, int type) | |
911e1c9b | 325 | { |
e5b6c151 | 326 | struct dmi_dev_onboard *dev; |
911e1c9b | 327 | |
e5b6c151 JH |
328 | /* Ignore invalid values */ |
329 | if (type == DMI_DEV_TYPE_DEV_SLOT && | |
330 | segment == 0xFFFF && bus == 0xFF && devfn == 0xFF) | |
911e1c9b | 331 | return; |
ae797449 | 332 | |
e5b6c151 JH |
333 | dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); |
334 | if (!dev) | |
335 | return; | |
911e1c9b | 336 | |
e5b6c151 JH |
337 | dev->instance = instance; |
338 | dev->segment = segment; | |
339 | dev->bus = bus; | |
340 | dev->devfn = devfn; | |
911e1c9b | 341 | |
e5b6c151 JH |
342 | strcpy((char *)&dev[1], name); |
343 | dev->dev.type = type; | |
344 | dev->dev.name = (char *)&dev[1]; | |
345 | dev->dev.device_data = dev; | |
346 | ||
347 | list_add(&dev->dev.list, &dmi_devices); | |
911e1c9b N |
348 | } |
349 | ||
b4bd7d59 WVS |
350 | static void __init dmi_save_extended_devices(const struct dmi_header *dm) |
351 | { | |
96e23943 | 352 | const char *name; |
45b98257 | 353 | const u8 *d = (u8 *)dm; |
b4bd7d59 | 354 | |
a814c359 JD |
355 | if (dm->length < 0x0B) |
356 | return; | |
357 | ||
b4bd7d59 | 358 | /* Skip disabled device */ |
45b98257 | 359 | if ((d[0x5] & 0x80) == 0) |
b4bd7d59 WVS |
360 | return; |
361 | ||
45b98257 | 362 | name = dmi_string_nosave(dm, d[0x4]); |
e5b6c151 JH |
363 | dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name, |
364 | DMI_DEV_TYPE_DEV_ONBOARD); | |
45b98257 | 365 | dmi_save_one_device(d[0x5] & 0x7f, name); |
b4bd7d59 WVS |
366 | } |
367 | ||
e5b6c151 JH |
368 | static void __init dmi_save_system_slot(const struct dmi_header *dm) |
369 | { | |
370 | const u8 *d = (u8 *)dm; | |
371 | ||
372 | /* Need SMBIOS 2.6+ structure */ | |
373 | if (dm->length < 0x11) | |
374 | return; | |
375 | dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF], | |
376 | d[0x10], dmi_string_nosave(dm, d[0x4]), | |
377 | DMI_DEV_TYPE_DEV_SLOT); | |
378 | } | |
379 | ||
dd6dad42 CG |
380 | static void __init count_mem_devices(const struct dmi_header *dm, void *v) |
381 | { | |
382 | if (dm->type != DMI_ENTRY_MEM_DEVICE) | |
383 | return; | |
384 | dmi_memdev_nr++; | |
385 | } | |
386 | ||
387 | static void __init save_mem_devices(const struct dmi_header *dm, void *v) | |
388 | { | |
389 | const char *d = (const char *)dm; | |
390 | static int nr; | |
6deae96b TL |
391 | u64 bytes; |
392 | u16 size; | |
dd6dad42 | 393 | |
a814c359 | 394 | if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12) |
dd6dad42 CG |
395 | return; |
396 | if (nr >= dmi_memdev_nr) { | |
397 | pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n"); | |
398 | return; | |
399 | } | |
0841c04d | 400 | dmi_memdev[nr].handle = get_unaligned(&dm->handle); |
dd6dad42 CG |
401 | dmi_memdev[nr].device = dmi_string(dm, d[0x10]); |
402 | dmi_memdev[nr].bank = dmi_string(dm, d[0x11]); | |
6deae96b TL |
403 | |
404 | size = get_unaligned((u16 *)&d[0xC]); | |
405 | if (size == 0) | |
406 | bytes = 0; | |
407 | else if (size == 0xffff) | |
408 | bytes = ~0ull; | |
409 | else if (size & 0x8000) | |
410 | bytes = (u64)(size & 0x7fff) << 10; | |
411 | else if (size != 0x7fff) | |
412 | bytes = (u64)size << 20; | |
413 | else | |
414 | bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20; | |
415 | ||
416 | dmi_memdev[nr].size = bytes; | |
dd6dad42 CG |
417 | nr++; |
418 | } | |
419 | ||
0fca0812 | 420 | static void __init dmi_memdev_walk(void) |
dd6dad42 | 421 | { |
dd6dad42 CG |
422 | if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) { |
423 | dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr); | |
424 | if (dmi_memdev) | |
425 | dmi_walk_early(save_mem_devices); | |
426 | } | |
427 | } | |
428 | ||
1da177e4 LT |
429 | /* |
430 | * Process a DMI table entry. Right now all we care about are the BIOS | |
431 | * and machine entries. For 2.5 we should pull the smbus controller info | |
432 | * out of here. | |
433 | */ | |
e7a19c56 | 434 | static void __init dmi_decode(const struct dmi_header *dm, void *dummy) |
1da177e4 | 435 | { |
02d9c47f | 436 | switch (dm->type) { |
ebad6a42 | 437 | case 0: /* BIOS Information */ |
1249c513 | 438 | dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); |
1249c513 | 439 | dmi_save_ident(dm, DMI_BIOS_VERSION, 5); |
1249c513 AP |
440 | dmi_save_ident(dm, DMI_BIOS_DATE, 8); |
441 | break; | |
ebad6a42 | 442 | case 1: /* System Information */ |
1249c513 | 443 | dmi_save_ident(dm, DMI_SYS_VENDOR, 4); |
1249c513 | 444 | dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); |
1249c513 | 445 | dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); |
1249c513 | 446 | dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); |
4f5c791a | 447 | dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); |
b23908d3 | 448 | dmi_save_ident(dm, DMI_PRODUCT_SKU, 25); |
c61872c9 | 449 | dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26); |
1249c513 | 450 | break; |
ebad6a42 | 451 | case 2: /* Base Board Information */ |
1249c513 | 452 | dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); |
1249c513 | 453 | dmi_save_ident(dm, DMI_BOARD_NAME, 5); |
1249c513 | 454 | dmi_save_ident(dm, DMI_BOARD_VERSION, 6); |
4f5c791a LP |
455 | dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); |
456 | dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); | |
457 | break; | |
458 | case 3: /* Chassis Information */ | |
459 | dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); | |
460 | dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); | |
461 | dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); | |
462 | dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); | |
463 | dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); | |
1249c513 | 464 | break; |
e5b6c151 JH |
465 | case 9: /* System Slots */ |
466 | dmi_save_system_slot(dm); | |
467 | break; | |
ebad6a42 AP |
468 | case 10: /* Onboard Devices Information */ |
469 | dmi_save_devices(dm); | |
470 | break; | |
2e0c1f6c SM |
471 | case 11: /* OEM Strings */ |
472 | dmi_save_oem_strings_devices(dm); | |
473 | break; | |
ebad6a42 AP |
474 | case 38: /* IPMI Device Information */ |
475 | dmi_save_ipmi_device(dm); | |
b4bd7d59 WVS |
476 | break; |
477 | case 41: /* Onboard Devices Extended Information */ | |
478 | dmi_save_extended_devices(dm); | |
1da177e4 LT |
479 | } |
480 | } | |
481 | ||
c90fe6bc | 482 | static int __init print_filtered(char *buf, size_t len, const char *info) |
8881cdce | 483 | { |
c90fe6bc | 484 | int c = 0; |
8881cdce BH |
485 | const char *p; |
486 | ||
487 | if (!info) | |
c90fe6bc | 488 | return c; |
8881cdce BH |
489 | |
490 | for (p = info; *p; p++) | |
491 | if (isprint(*p)) | |
c90fe6bc | 492 | c += scnprintf(buf + c, len - c, "%c", *p); |
8881cdce | 493 | else |
c90fe6bc TH |
494 | c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff); |
495 | return c; | |
8881cdce BH |
496 | } |
497 | ||
c90fe6bc | 498 | static void __init dmi_format_ids(char *buf, size_t len) |
8881cdce | 499 | { |
c90fe6bc | 500 | int c = 0; |
84e383b3 NC |
501 | const char *board; /* Board Name is optional */ |
502 | ||
c90fe6bc TH |
503 | c += print_filtered(buf + c, len - c, |
504 | dmi_get_system_info(DMI_SYS_VENDOR)); | |
505 | c += scnprintf(buf + c, len - c, " "); | |
506 | c += print_filtered(buf + c, len - c, | |
507 | dmi_get_system_info(DMI_PRODUCT_NAME)); | |
508 | ||
84e383b3 NC |
509 | board = dmi_get_system_info(DMI_BOARD_NAME); |
510 | if (board) { | |
c90fe6bc TH |
511 | c += scnprintf(buf + c, len - c, "/"); |
512 | c += print_filtered(buf + c, len - c, board); | |
84e383b3 | 513 | } |
c90fe6bc TH |
514 | c += scnprintf(buf + c, len - c, ", BIOS "); |
515 | c += print_filtered(buf + c, len - c, | |
516 | dmi_get_system_info(DMI_BIOS_VERSION)); | |
517 | c += scnprintf(buf + c, len - c, " "); | |
518 | c += print_filtered(buf + c, len - c, | |
519 | dmi_get_system_info(DMI_BIOS_DATE)); | |
8881cdce BH |
520 | } |
521 | ||
d39de28c BH |
522 | /* |
523 | * Check for DMI/SMBIOS headers in the system firmware image. Any | |
524 | * SMBIOS header must start 16 bytes before the DMI header, so take a | |
525 | * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset | |
526 | * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS | |
527 | * takes precedence) and return 0. Otherwise return 1. | |
528 | */ | |
79bae42d | 529 | static int __init dmi_present(const u8 *buf) |
1da177e4 | 530 | { |
95be58df | 531 | u32 smbios_ver; |
1855256c | 532 | |
79bae42d BH |
533 | if (memcmp(buf, "_SM_", 4) == 0 && |
534 | buf[5] < 32 && dmi_checksum(buf, buf[5])) { | |
fc430262 | 535 | smbios_ver = get_unaligned_be16(buf + 6); |
d7f96f97 IK |
536 | smbios_entry_point_size = buf[5]; |
537 | memcpy(smbios_entry_point, buf, smbios_entry_point_size); | |
79bae42d BH |
538 | |
539 | /* Some BIOS report weird SMBIOS version, fix that up */ | |
540 | switch (smbios_ver) { | |
541 | case 0x021F: | |
542 | case 0x0221: | |
d1d8704c | 543 | pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", |
79bae42d BH |
544 | smbios_ver & 0xFF, 3); |
545 | smbios_ver = 0x0203; | |
546 | break; | |
547 | case 0x0233: | |
d1d8704c | 548 | pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6); |
79bae42d BH |
549 | smbios_ver = 0x0206; |
550 | break; | |
551 | } | |
552 | } else { | |
553 | smbios_ver = 0; | |
554 | } | |
555 | ||
556 | buf += 16; | |
557 | ||
558 | if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) { | |
5c1ac56b JD |
559 | if (smbios_ver) |
560 | dmi_ver = smbios_ver; | |
561 | else | |
562 | dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F); | |
ff4319dc | 563 | dmi_ver <<= 8; |
fc430262 AB |
564 | dmi_num = get_unaligned_le16(buf + 12); |
565 | dmi_len = get_unaligned_le16(buf + 6); | |
566 | dmi_base = get_unaligned_le32(buf + 8); | |
61e032fa | 567 | |
8881cdce | 568 | if (dmi_walk_early(dmi_decode) == 0) { |
79bae42d | 569 | if (smbios_ver) { |
c2493045 | 570 | pr_info("SMBIOS %d.%d present.\n", |
ff4319dc | 571 | dmi_ver >> 16, (dmi_ver >> 8) & 0xFF); |
79bae42d | 572 | } else { |
d7f96f97 IK |
573 | smbios_entry_point_size = 15; |
574 | memcpy(smbios_entry_point, buf, | |
575 | smbios_entry_point_size); | |
9f9c9cbb | 576 | pr_info("Legacy DMI %d.%d present.\n", |
ff4319dc | 577 | dmi_ver >> 16, (dmi_ver >> 8) & 0xFF); |
9f9c9cbb | 578 | } |
c90fe6bc | 579 | dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); |
d4af49f8 | 580 | pr_info("DMI: %s\n", dmi_ids_string); |
3ed3bce8 | 581 | return 0; |
8881cdce | 582 | } |
3ed3bce8 | 583 | } |
61e032fa | 584 | |
a40e7cf8 | 585 | return 1; |
9f9c9cbb ZD |
586 | } |
587 | ||
fc430262 AB |
588 | /* |
589 | * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy | |
590 | * 32-bit entry point, there is no embedded DMI header (_DMI_) in here. | |
591 | */ | |
592 | static int __init dmi_smbios3_present(const u8 *buf) | |
593 | { | |
594 | if (memcmp(buf, "_SM3_", 5) == 0 && | |
595 | buf[6] < 32 && dmi_checksum(buf, buf[6])) { | |
d1d8704c | 596 | dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF; |
bfbaafae | 597 | dmi_num = 0; /* No longer specified */ |
fc430262 AB |
598 | dmi_len = get_unaligned_le32(buf + 12); |
599 | dmi_base = get_unaligned_le64(buf + 16); | |
d7f96f97 IK |
600 | smbios_entry_point_size = buf[6]; |
601 | memcpy(smbios_entry_point, buf, smbios_entry_point_size); | |
fc430262 | 602 | |
fc430262 | 603 | if (dmi_walk_early(dmi_decode) == 0) { |
95be58df IK |
604 | pr_info("SMBIOS %d.%d.%d present.\n", |
605 | dmi_ver >> 16, (dmi_ver >> 8) & 0xFF, | |
606 | dmi_ver & 0xFF); | |
fc430262 | 607 | dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); |
d4af49f8 | 608 | pr_info("DMI: %s\n", dmi_ids_string); |
fc430262 AB |
609 | return 0; |
610 | } | |
611 | } | |
612 | return 1; | |
613 | } | |
614 | ||
0fca0812 | 615 | static void __init dmi_scan_machine(void) |
3ed3bce8 MD |
616 | { |
617 | char __iomem *p, *q; | |
79bae42d | 618 | char buf[32]; |
3ed3bce8 | 619 | |
83e68189 | 620 | if (efi_enabled(EFI_CONFIG_TABLES)) { |
fc430262 AB |
621 | /* |
622 | * According to the DMTF SMBIOS reference spec v3.0.0, it is | |
623 | * allowed to define both the 64-bit entry point (smbios3) and | |
624 | * the 32-bit entry point (smbios), in which case they should | |
625 | * either both point to the same SMBIOS structure table, or the | |
626 | * table pointed to by the 64-bit entry point should contain a | |
627 | * superset of the table contents pointed to by the 32-bit entry | |
628 | * point (section 5.2) | |
629 | * This implies that the 64-bit entry point should have | |
630 | * precedence if it is defined and supported by the OS. If we | |
631 | * have the 64-bit entry point, but fail to decode it, fall | |
632 | * back to the legacy one (if available) | |
633 | */ | |
634 | if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) { | |
635 | p = dmi_early_remap(efi.smbios3, 32); | |
636 | if (p == NULL) | |
637 | goto error; | |
638 | memcpy_fromio(buf, p, 32); | |
639 | dmi_early_unmap(p, 32); | |
640 | ||
641 | if (!dmi_smbios3_present(buf)) { | |
642 | dmi_available = 1; | |
7117794f | 643 | return; |
fc430262 AB |
644 | } |
645 | } | |
b2c99e3c | 646 | if (efi.smbios == EFI_INVALID_TABLE_ADDR) |
9a22b6e7 | 647 | goto error; |
3ed3bce8 | 648 | |
4f5c791a LP |
649 | /* This is called as a core_initcall() because it isn't |
650 | * needed during early boot. This also means we can | |
651 | * iounmap the space when we're done with it. | |
652 | */ | |
cf074402 | 653 | p = dmi_early_remap(efi.smbios, 32); |
3ed3bce8 | 654 | if (p == NULL) |
9a22b6e7 | 655 | goto error; |
79bae42d | 656 | memcpy_fromio(buf, p, 32); |
cf074402 | 657 | dmi_early_unmap(p, 32); |
79bae42d BH |
658 | |
659 | if (!dmi_present(buf)) { | |
4f5c791a | 660 | dmi_available = 1; |
7117794f | 661 | return; |
4f5c791a | 662 | } |
cf074402 AB |
663 | } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) { |
664 | p = dmi_early_remap(0xF0000, 0x10000); | |
3ed3bce8 | 665 | if (p == NULL) |
9a22b6e7 | 666 | goto error; |
3ed3bce8 | 667 | |
c9aba143 JD |
668 | /* |
669 | * Same logic as above, look for a 64-bit entry point | |
670 | * first, and if not found, fall back to 32-bit entry point. | |
671 | */ | |
672 | memcpy_fromio(buf, p, 16); | |
673 | for (q = p + 16; q < p + 0x10000; q += 16) { | |
674 | memcpy_fromio(buf + 16, q, 16); | |
675 | if (!dmi_smbios3_present(buf)) { | |
676 | dmi_available = 1; | |
677 | dmi_early_unmap(p, 0x10000); | |
7117794f | 678 | return; |
c9aba143 JD |
679 | } |
680 | memcpy(buf, buf + 16, 16); | |
681 | } | |
682 | ||
d39de28c BH |
683 | /* |
684 | * Iterate over all possible DMI header addresses q. | |
685 | * Maintain the 32 bytes around q in buf. On the | |
686 | * first iteration, substitute zero for the | |
687 | * out-of-range bytes so there is no chance of falsely | |
688 | * detecting an SMBIOS header. | |
689 | */ | |
79bae42d | 690 | memset(buf, 0, 16); |
3ed3bce8 | 691 | for (q = p; q < p + 0x10000; q += 16) { |
79bae42d | 692 | memcpy_fromio(buf + 16, q, 16); |
c9aba143 | 693 | if (!dmi_present(buf)) { |
4f5c791a | 694 | dmi_available = 1; |
cf074402 | 695 | dmi_early_unmap(p, 0x10000); |
7117794f | 696 | return; |
4f5c791a | 697 | } |
79bae42d | 698 | memcpy(buf, buf + 16, 16); |
61e032fa | 699 | } |
cf074402 | 700 | dmi_early_unmap(p, 0x10000); |
61e032fa | 701 | } |
9a22b6e7 | 702 | error: |
02d9c47f | 703 | pr_info("DMI not present or invalid.\n"); |
1da177e4 LT |
704 | } |
705 | ||
d7f96f97 IK |
706 | static ssize_t raw_table_read(struct file *file, struct kobject *kobj, |
707 | struct bin_attribute *attr, char *buf, | |
708 | loff_t pos, size_t count) | |
709 | { | |
710 | memcpy(buf, attr->private + pos, count); | |
711 | return count; | |
712 | } | |
713 | ||
714 | static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0); | |
715 | static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0); | |
716 | ||
717 | static int __init dmi_init(void) | |
718 | { | |
719 | struct kobject *tables_kobj; | |
720 | u8 *dmi_table; | |
721 | int ret = -ENOMEM; | |
722 | ||
a81114d0 AB |
723 | if (!dmi_available) |
724 | return 0; | |
d7f96f97 IK |
725 | |
726 | /* | |
727 | * Set up dmi directory at /sys/firmware/dmi. This entry should stay | |
728 | * even after farther error, as it can be used by other modules like | |
729 | * dmi-sysfs. | |
730 | */ | |
731 | dmi_kobj = kobject_create_and_add("dmi", firmware_kobj); | |
732 | if (!dmi_kobj) | |
733 | goto err; | |
734 | ||
735 | tables_kobj = kobject_create_and_add("tables", dmi_kobj); | |
736 | if (!tables_kobj) | |
737 | goto err; | |
738 | ||
739 | dmi_table = dmi_remap(dmi_base, dmi_len); | |
740 | if (!dmi_table) | |
741 | goto err_tables; | |
742 | ||
743 | bin_attr_smbios_entry_point.size = smbios_entry_point_size; | |
744 | bin_attr_smbios_entry_point.private = smbios_entry_point; | |
745 | ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point); | |
746 | if (ret) | |
747 | goto err_unmap; | |
748 | ||
749 | bin_attr_DMI.size = dmi_len; | |
750 | bin_attr_DMI.private = dmi_table; | |
751 | ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI); | |
752 | if (!ret) | |
753 | return 0; | |
754 | ||
755 | sysfs_remove_bin_file(tables_kobj, | |
756 | &bin_attr_smbios_entry_point); | |
757 | err_unmap: | |
758 | dmi_unmap(dmi_table); | |
759 | err_tables: | |
760 | kobject_del(tables_kobj); | |
761 | kobject_put(tables_kobj); | |
762 | err: | |
763 | pr_err("dmi: Firmware registration failed.\n"); | |
764 | ||
765 | return ret; | |
766 | } | |
767 | subsys_initcall(dmi_init); | |
768 | ||
98e5e1bf | 769 | /** |
0fca0812 | 770 | * dmi_setup - scan and setup DMI system information |
98e5e1bf | 771 | * |
0fca0812 RR |
772 | * Scan the DMI system information. This setups DMI identifiers |
773 | * (dmi_system_id) for printing it out on task dumps and prepares | |
774 | * DIMM entry information (dmi_memdev_info) from the SMBIOS table | |
775 | * for using this when reporting memory errors. | |
98e5e1bf | 776 | */ |
0fca0812 | 777 | void __init dmi_setup(void) |
98e5e1bf | 778 | { |
0fca0812 RR |
779 | dmi_scan_machine(); |
780 | if (!dmi_available) | |
781 | return; | |
782 | ||
783 | dmi_memdev_walk(); | |
98e5e1bf TH |
784 | dump_stack_set_arch_desc("%s", dmi_ids_string); |
785 | } | |
786 | ||
d7b1956f RW |
787 | /** |
788 | * dmi_matches - check if dmi_system_id structure matches system DMI data | |
789 | * @dmi: pointer to the dmi_system_id structure to check | |
790 | */ | |
791 | static bool dmi_matches(const struct dmi_system_id *dmi) | |
792 | { | |
793 | int i; | |
794 | ||
d7b1956f RW |
795 | for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) { |
796 | int s = dmi->matches[i].slot; | |
797 | if (s == DMI_NONE) | |
75757507 | 798 | break; |
de40614d AH |
799 | if (s == DMI_OEM_STRING) { |
800 | /* DMI_OEM_STRING must be exact match */ | |
801 | const struct dmi_device *valid; | |
802 | ||
803 | valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, | |
804 | dmi->matches[i].substr, NULL); | |
805 | if (valid) | |
806 | continue; | |
807 | } else if (dmi_ident[s]) { | |
8cf4e6a0 JD |
808 | if (dmi->matches[i].exact_match) { |
809 | if (!strcmp(dmi_ident[s], | |
810 | dmi->matches[i].substr)) | |
811 | continue; | |
812 | } else { | |
813 | if (strstr(dmi_ident[s], | |
814 | dmi->matches[i].substr)) | |
815 | continue; | |
816 | } | |
5017b285 JN |
817 | } |
818 | ||
d7b1956f RW |
819 | /* No match */ |
820 | return false; | |
821 | } | |
822 | return true; | |
823 | } | |
824 | ||
75757507 DT |
825 | /** |
826 | * dmi_is_end_of_table - check for end-of-table marker | |
827 | * @dmi: pointer to the dmi_system_id structure to check | |
828 | */ | |
829 | static bool dmi_is_end_of_table(const struct dmi_system_id *dmi) | |
830 | { | |
831 | return dmi->matches[0].slot == DMI_NONE; | |
832 | } | |
833 | ||
1da177e4 LT |
834 | /** |
835 | * dmi_check_system - check system DMI data | |
836 | * @list: array of dmi_system_id structures to match against | |
b0ef371e RD |
837 | * All non-null elements of the list must match |
838 | * their slot's (field index's) data (i.e., each | |
839 | * list string must be a substring of the specified | |
840 | * DMI slot's string data) to be considered a | |
841 | * successful match. | |
1da177e4 LT |
842 | * |
843 | * Walk the blacklist table running matching functions until someone | |
844 | * returns non zero or we hit the end. Callback function is called for | |
b0ef371e | 845 | * each successful match. Returns the number of matches. |
7117794f | 846 | * |
0fca0812 | 847 | * dmi_setup must be called before this function is called. |
1da177e4 | 848 | */ |
1855256c | 849 | int dmi_check_system(const struct dmi_system_id *list) |
1da177e4 | 850 | { |
d7b1956f RW |
851 | int count = 0; |
852 | const struct dmi_system_id *d; | |
853 | ||
75757507 | 854 | for (d = list; !dmi_is_end_of_table(d); d++) |
d7b1956f RW |
855 | if (dmi_matches(d)) { |
856 | count++; | |
857 | if (d->callback && d->callback(d)) | |
858 | break; | |
1da177e4 | 859 | } |
1da177e4 LT |
860 | |
861 | return count; | |
862 | } | |
1da177e4 LT |
863 | EXPORT_SYMBOL(dmi_check_system); |
864 | ||
d7b1956f RW |
865 | /** |
866 | * dmi_first_match - find dmi_system_id structure matching system DMI data | |
867 | * @list: array of dmi_system_id structures to match against | |
868 | * All non-null elements of the list must match | |
869 | * their slot's (field index's) data (i.e., each | |
870 | * list string must be a substring of the specified | |
871 | * DMI slot's string data) to be considered a | |
872 | * successful match. | |
873 | * | |
874 | * Walk the blacklist table until the first match is found. Return the | |
875 | * pointer to the matching entry or NULL if there's no match. | |
7117794f | 876 | * |
0fca0812 | 877 | * dmi_setup must be called before this function is called. |
d7b1956f RW |
878 | */ |
879 | const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list) | |
880 | { | |
881 | const struct dmi_system_id *d; | |
882 | ||
75757507 | 883 | for (d = list; !dmi_is_end_of_table(d); d++) |
d7b1956f RW |
884 | if (dmi_matches(d)) |
885 | return d; | |
886 | ||
887 | return NULL; | |
888 | } | |
889 | EXPORT_SYMBOL(dmi_first_match); | |
890 | ||
1da177e4 LT |
891 | /** |
892 | * dmi_get_system_info - return DMI data value | |
b0ef371e | 893 | * @field: data index (see enum dmi_field) |
1da177e4 LT |
894 | * |
895 | * Returns one DMI data value, can be used to perform | |
896 | * complex DMI data checks. | |
897 | */ | |
1855256c | 898 | const char *dmi_get_system_info(int field) |
1da177e4 LT |
899 | { |
900 | return dmi_ident[field]; | |
901 | } | |
e70c9d5e | 902 | EXPORT_SYMBOL(dmi_get_system_info); |
ebad6a42 | 903 | |
fd8cd7e1 | 904 | /** |
c2bacfc4 RD |
905 | * dmi_name_in_serial - Check if string is in the DMI product serial information |
906 | * @str: string to check for | |
fd8cd7e1 AK |
907 | */ |
908 | int dmi_name_in_serial(const char *str) | |
909 | { | |
910 | int f = DMI_PRODUCT_SERIAL; | |
911 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
912 | return 1; | |
913 | return 0; | |
914 | } | |
a1bae672 AK |
915 | |
916 | /** | |
66e13e66 | 917 | * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name |
02d9c47f | 918 | * @str: Case sensitive Name |
a1bae672 | 919 | */ |
1855256c | 920 | int dmi_name_in_vendors(const char *str) |
a1bae672 | 921 | { |
66e13e66 | 922 | static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE }; |
a1bae672 AK |
923 | int i; |
924 | for (i = 0; fields[i] != DMI_NONE; i++) { | |
925 | int f = fields[i]; | |
926 | if (dmi_ident[f] && strstr(dmi_ident[f], str)) | |
927 | return 1; | |
928 | } | |
929 | return 0; | |
930 | } | |
931 | EXPORT_SYMBOL(dmi_name_in_vendors); | |
932 | ||
ebad6a42 AP |
933 | /** |
934 | * dmi_find_device - find onboard device by type/name | |
935 | * @type: device type or %DMI_DEV_TYPE_ANY to match all device types | |
b0ef371e | 936 | * @name: device name string or %NULL to match all |
ebad6a42 AP |
937 | * @from: previous device found in search, or %NULL for new search. |
938 | * | |
939 | * Iterates through the list of known onboard devices. If a device is | |
bfab8b48 | 940 | * found with a matching @type and @name, a pointer to its device |
ebad6a42 | 941 | * structure is returned. Otherwise, %NULL is returned. |
b0ef371e | 942 | * A new search is initiated by passing %NULL as the @from argument. |
ebad6a42 AP |
943 | * If @from is not %NULL, searches continue from next device. |
944 | */ | |
02d9c47f | 945 | const struct dmi_device *dmi_find_device(int type, const char *name, |
1855256c | 946 | const struct dmi_device *from) |
ebad6a42 | 947 | { |
1855256c JG |
948 | const struct list_head *head = from ? &from->list : &dmi_devices; |
949 | struct list_head *d; | |
ebad6a42 | 950 | |
02d9c47f | 951 | for (d = head->next; d != &dmi_devices; d = d->next) { |
1855256c JG |
952 | const struct dmi_device *dev = |
953 | list_entry(d, struct dmi_device, list); | |
ebad6a42 AP |
954 | |
955 | if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && | |
956 | ((name == NULL) || (strcmp(dev->name, name) == 0))) | |
957 | return dev; | |
958 | } | |
959 | ||
960 | return NULL; | |
961 | } | |
962 | EXPORT_SYMBOL(dmi_find_device); | |
f083a329 AK |
963 | |
964 | /** | |
3e5cd1f2 TH |
965 | * dmi_get_date - parse a DMI date |
966 | * @field: data index (see enum dmi_field) | |
967 | * @yearp: optional out parameter for the year | |
968 | * @monthp: optional out parameter for the month | |
969 | * @dayp: optional out parameter for the day | |
f083a329 | 970 | * |
3e5cd1f2 TH |
971 | * The date field is assumed to be in the form resembling |
972 | * [mm[/dd]]/yy[yy] and the result is stored in the out | |
973 | * parameters any or all of which can be omitted. | |
974 | * | |
975 | * If the field doesn't exist, all out parameters are set to zero | |
976 | * and false is returned. Otherwise, true is returned with any | |
977 | * invalid part of date set to zero. | |
978 | * | |
979 | * On return, year, month and day are guaranteed to be in the | |
980 | * range of [0,9999], [0,12] and [0,31] respectively. | |
f083a329 | 981 | */ |
3e5cd1f2 | 982 | bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp) |
f083a329 | 983 | { |
3e5cd1f2 TH |
984 | int year = 0, month = 0, day = 0; |
985 | bool exists; | |
986 | const char *s, *y; | |
02c24fa8 | 987 | char *e; |
f083a329 | 988 | |
3e5cd1f2 TH |
989 | s = dmi_get_system_info(field); |
990 | exists = s; | |
991 | if (!exists) | |
992 | goto out; | |
f083a329 | 993 | |
3e5cd1f2 TH |
994 | /* |
995 | * Determine year first. We assume the date string resembles | |
996 | * mm/dd/yy[yy] but the original code extracted only the year | |
997 | * from the end. Keep the behavior in the spirit of no | |
998 | * surprises. | |
999 | */ | |
1000 | y = strrchr(s, '/'); | |
1001 | if (!y) | |
1002 | goto out; | |
1003 | ||
1004 | y++; | |
1005 | year = simple_strtoul(y, &e, 10); | |
1006 | if (y != e && year < 100) { /* 2-digit year */ | |
f083a329 AK |
1007 | year += 1900; |
1008 | if (year < 1996) /* no dates < spec 1.0 */ | |
1009 | year += 100; | |
1010 | } | |
3e5cd1f2 TH |
1011 | if (year > 9999) /* year should fit in %04d */ |
1012 | year = 0; | |
1013 | ||
1014 | /* parse the mm and dd */ | |
1015 | month = simple_strtoul(s, &e, 10); | |
1016 | if (s == e || *e != '/' || !month || month > 12) { | |
1017 | month = 0; | |
1018 | goto out; | |
1019 | } | |
f083a329 | 1020 | |
3e5cd1f2 TH |
1021 | s = e + 1; |
1022 | day = simple_strtoul(s, &e, 10); | |
1023 | if (s == y || s == e || *e != '/' || day > 31) | |
1024 | day = 0; | |
1025 | out: | |
1026 | if (yearp) | |
1027 | *yearp = year; | |
1028 | if (monthp) | |
1029 | *monthp = month; | |
1030 | if (dayp) | |
1031 | *dayp = day; | |
1032 | return exists; | |
f083a329 | 1033 | } |
3e5cd1f2 | 1034 | EXPORT_SYMBOL(dmi_get_date); |
7fce084a | 1035 | |
3af34525 AS |
1036 | /** |
1037 | * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field | |
1038 | * | |
1039 | * Returns year on success, -ENXIO if DMI is not selected, | |
1040 | * or a different negative error code if DMI field is not present | |
1041 | * or not parseable. | |
1042 | */ | |
1043 | int dmi_get_bios_year(void) | |
1044 | { | |
1045 | bool exists; | |
1046 | int year; | |
1047 | ||
1048 | exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL); | |
1049 | if (!exists) | |
1050 | return -ENODATA; | |
1051 | ||
1052 | return year ? year : -ERANGE; | |
1053 | } | |
1054 | EXPORT_SYMBOL(dmi_get_bios_year); | |
1055 | ||
7fce084a JD |
1056 | /** |
1057 | * dmi_walk - Walk the DMI table and get called back for every record | |
1058 | * @decode: Callback function | |
e7a19c56 | 1059 | * @private_data: Private data to be passed to the callback function |
7fce084a | 1060 | * |
c9268200 AL |
1061 | * Returns 0 on success, -ENXIO if DMI is not selected or not present, |
1062 | * or a different negative error code if DMI walking fails. | |
7fce084a | 1063 | */ |
e7a19c56 JD |
1064 | int dmi_walk(void (*decode)(const struct dmi_header *, void *), |
1065 | void *private_data) | |
7fce084a JD |
1066 | { |
1067 | u8 *buf; | |
1068 | ||
1069 | if (!dmi_available) | |
c9268200 | 1070 | return -ENXIO; |
7fce084a | 1071 | |
cf074402 | 1072 | buf = dmi_remap(dmi_base, dmi_len); |
7fce084a | 1073 | if (buf == NULL) |
c9268200 | 1074 | return -ENOMEM; |
7fce084a | 1075 | |
eb4c5ea5 | 1076 | dmi_decode_table(buf, decode, private_data); |
7fce084a | 1077 | |
cf074402 | 1078 | dmi_unmap(buf); |
7fce084a JD |
1079 | return 0; |
1080 | } | |
1081 | EXPORT_SYMBOL_GPL(dmi_walk); | |
d61c72e5 JS |
1082 | |
1083 | /** | |
1084 | * dmi_match - compare a string to the dmi field (if exists) | |
c2bacfc4 RD |
1085 | * @f: DMI field identifier |
1086 | * @str: string to compare the DMI field to | |
d61c72e5 JS |
1087 | * |
1088 | * Returns true if the requested field equals to the str (including NULL). | |
1089 | */ | |
1090 | bool dmi_match(enum dmi_field f, const char *str) | |
1091 | { | |
1092 | const char *info = dmi_get_system_info(f); | |
1093 | ||
1094 | if (info == NULL || str == NULL) | |
1095 | return info == str; | |
1096 | ||
1097 | return !strcmp(info, str); | |
1098 | } | |
1099 | EXPORT_SYMBOL_GPL(dmi_match); | |
dd6dad42 CG |
1100 | |
1101 | void dmi_memdev_name(u16 handle, const char **bank, const char **device) | |
1102 | { | |
1103 | int n; | |
1104 | ||
1105 | if (dmi_memdev == NULL) | |
1106 | return; | |
1107 | ||
1108 | for (n = 0; n < dmi_memdev_nr; n++) { | |
1109 | if (handle == dmi_memdev[n].handle) { | |
1110 | *bank = dmi_memdev[n].bank; | |
1111 | *device = dmi_memdev[n].device; | |
1112 | break; | |
1113 | } | |
1114 | } | |
1115 | } | |
1116 | EXPORT_SYMBOL_GPL(dmi_memdev_name); | |
6deae96b TL |
1117 | |
1118 | u64 dmi_memdev_size(u16 handle) | |
1119 | { | |
1120 | int n; | |
1121 | ||
1122 | if (dmi_memdev) { | |
1123 | for (n = 0; n < dmi_memdev_nr; n++) { | |
1124 | if (handle == dmi_memdev[n].handle) | |
1125 | return dmi_memdev[n].size; | |
1126 | } | |
1127 | } | |
1128 | return ~0ull; | |
1129 | } | |
1130 | EXPORT_SYMBOL_GPL(dmi_memdev_size); |