1#include <linux/types.h> 2#include <linux/string.h> 3#include <linux/init.h> 4#include <linux/module.h> 5#include <linux/ctype.h> 6#include <linux/dmi.h> 7#include <linux/efi.h> 8#include <linux/bootmem.h> 9#include <linux/random.h> 10#include <asm/dmi.h> 11#include <asm/unaligned.h> 12 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 */ 18static const char dmi_empty_string[] = " "; 19 20static u32 dmi_ver __initdata; 21static u32 dmi_len; 22static u16 dmi_num; 23/* 24 * Catch too early calls to dmi_check_system(): 25 */ 26static int dmi_initialized; 27 28/* DMI system identification string used during boot */ 29static char dmi_ids_string[128] __initdata; 30 31static struct dmi_memdev_info { 32 const char *device; 33 const char *bank; 34 u16 handle; 35} *dmi_memdev; 36static int dmi_memdev_nr; 37 38static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s) 39{ 40 const u8 *bp = ((u8 *) dm) + dm->length; 41 42 if (s) { 43 s--; 44 while (s > 0 && *bp) { 45 bp += strlen(bp) + 1; 46 s--; 47 } 48 49 if (*bp != 0) { 50 size_t len = strlen(bp)+1; 51 size_t cmp_len = len > 8 ? 8 : len; 52 53 if (!memcmp(bp, dmi_empty_string, cmp_len)) 54 return dmi_empty_string; 55 return bp; 56 } 57 } 58 59 return ""; 60} 61 62static const char * __init dmi_string(const struct dmi_header *dm, u8 s) 63{ 64 const char *bp = dmi_string_nosave(dm, s); 65 char *str; 66 size_t len; 67 68 if (bp == dmi_empty_string) 69 return dmi_empty_string; 70 71 len = strlen(bp) + 1; 72 str = dmi_alloc(len); 73 if (str != NULL) 74 strcpy(str, bp); 75 76 return str; 77} 78 79/* 80 * We have to be cautious here. We have seen BIOSes with DMI pointers 81 * pointing to completely the wrong place for example 82 */ 83static void dmi_table(u8 *buf, 84 void (*decode)(const struct dmi_header *, void *), 85 void *private_data) 86{ 87 u8 *data = buf; 88 int i = 0; 89 90 /* 91 * Stop when we have seen all the items the table claimed to have 92 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS 93 * >= 3.0 only) OR we run off the end of the table (should never 94 * happen but sometimes does on bogus implementations.) 95 */ 96 while ((!dmi_num || i < dmi_num) && 97 (data - buf + sizeof(struct dmi_header)) <= dmi_len) { 98 const struct dmi_header *dm = (const struct dmi_header *)data; 99 100 /* 101 * We want to know the total length (formatted area and 102 * strings) before decoding to make sure we won't run off the 103 * table in dmi_decode or dmi_string 104 */ 105 data += dm->length; 106 while ((data - buf < dmi_len - 1) && (data[0] || data[1])) 107 data++; 108 if (data - buf < dmi_len - 1) 109 decode(dm, private_data); 110 111 /* 112 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0] 113 * For tables behind a 64-bit entry point, we have no item 114 * count and no exact table length, so stop on end-of-table 115 * marker. For tables behind a 32-bit entry point, we have 116 * seen OEM structures behind the end-of-table marker on 117 * some systems, so don't trust it. 118 */ 119 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE) 120 break; 121 122 data += 2; 123 i++; 124 } 125} 126 127static phys_addr_t dmi_base; 128 129static int __init dmi_walk_early(void (*decode)(const struct dmi_header *, 130 void *)) 131{ 132 u8 *buf; 133 134 buf = dmi_early_remap(dmi_base, dmi_len); 135 if (buf == NULL) 136 return -1; 137 138 dmi_table(buf, decode, NULL); 139 140 add_device_randomness(buf, dmi_len); 141 142 dmi_early_unmap(buf, dmi_len); 143 return 0; 144} 145 146static int __init dmi_checksum(const u8 *buf, u8 len) 147{ 148 u8 sum = 0; 149 int a; 150 151 for (a = 0; a < len; a++) 152 sum += buf[a]; 153 154 return sum == 0; 155} 156 157static const char *dmi_ident[DMI_STRING_MAX]; 158static LIST_HEAD(dmi_devices); 159int dmi_available; 160 161/* 162 * Save a DMI string 163 */ 164static void __init dmi_save_ident(const struct dmi_header *dm, int slot, 165 int string) 166{ 167 const char *d = (const char *) dm; 168 const char *p; 169 170 if (dmi_ident[slot]) 171 return; 172 173 p = dmi_string(dm, d[string]); 174 if (p == NULL) 175 return; 176 177 dmi_ident[slot] = p; 178} 179 180static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, 181 int index) 182{ 183 const u8 *d = (u8 *) dm + index; 184 char *s; 185 int is_ff = 1, is_00 = 1, i; 186 187 if (dmi_ident[slot]) 188 return; 189 190 for (i = 0; i < 16 && (is_ff || is_00); i++) { 191 if (d[i] != 0x00) 192 is_00 = 0; 193 if (d[i] != 0xFF) 194 is_ff = 0; 195 } 196 197 if (is_ff || is_00) 198 return; 199 200 s = dmi_alloc(16*2+4+1); 201 if (!s) 202 return; 203 204 /* 205 * As of version 2.6 of the SMBIOS specification, the first 3 fields of 206 * the UUID are supposed to be little-endian encoded. The specification 207 * says that this is the defacto standard. 208 */ 209 if (dmi_ver >= 0x020600) 210 sprintf(s, "%pUL", d); 211 else 212 sprintf(s, "%pUB", d); 213 214 dmi_ident[slot] = s; 215} 216 217static void __init dmi_save_type(const struct dmi_header *dm, int slot, 218 int index) 219{ 220 const u8 *d = (u8 *) dm + index; 221 char *s; 222 223 if (dmi_ident[slot]) 224 return; 225 226 s = dmi_alloc(4); 227 if (!s) 228 return; 229 230 sprintf(s, "%u", *d & 0x7F); 231 dmi_ident[slot] = s; 232} 233 234static void __init dmi_save_one_device(int type, const char *name) 235{ 236 struct dmi_device *dev; 237 238 /* No duplicate device */ 239 if (dmi_find_device(type, name, NULL)) 240 return; 241 242 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1); 243 if (!dev) 244 return; 245 246 dev->type = type; 247 strcpy((char *)(dev + 1), name); 248 dev->name = (char *)(dev + 1); 249 dev->device_data = NULL; 250 list_add(&dev->list, &dmi_devices); 251} 252 253static void __init dmi_save_devices(const struct dmi_header *dm) 254{ 255 int i, count = (dm->length - sizeof(struct dmi_header)) / 2; 256 257 for (i = 0; i < count; i++) { 258 const char *d = (char *)(dm + 1) + (i * 2); 259 260 /* Skip disabled device */ 261 if ((*d & 0x80) == 0) 262 continue; 263 264 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1))); 265 } 266} 267 268static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm) 269{ 270 int i, count = *(u8 *)(dm + 1); 271 struct dmi_device *dev; 272 273 for (i = 1; i <= count; i++) { 274 const char *devname = dmi_string(dm, i); 275 276 if (devname == dmi_empty_string) 277 continue; 278 279 dev = dmi_alloc(sizeof(*dev)); 280 if (!dev) 281 break; 282 283 dev->type = DMI_DEV_TYPE_OEM_STRING; 284 dev->name = devname; 285 dev->device_data = NULL; 286 287 list_add(&dev->list, &dmi_devices); 288 } 289} 290 291static void __init dmi_save_ipmi_device(const struct dmi_header *dm) 292{ 293 struct dmi_device *dev; 294 void *data; 295 296 data = dmi_alloc(dm->length); 297 if (data == NULL) 298 return; 299 300 memcpy(data, dm, dm->length); 301 302 dev = dmi_alloc(sizeof(*dev)); 303 if (!dev) 304 return; 305 306 dev->type = DMI_DEV_TYPE_IPMI; 307 dev->name = "IPMI controller"; 308 dev->device_data = data; 309 310 list_add_tail(&dev->list, &dmi_devices); 311} 312 313static void __init dmi_save_dev_onboard(int instance, int segment, int bus, 314 int devfn, const char *name) 315{ 316 struct dmi_dev_onboard *onboard_dev; 317 318 onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1); 319 if (!onboard_dev) 320 return; 321 322 onboard_dev->instance = instance; 323 onboard_dev->segment = segment; 324 onboard_dev->bus = bus; 325 onboard_dev->devfn = devfn; 326 327 strcpy((char *)&onboard_dev[1], name); 328 onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD; 329 onboard_dev->dev.name = (char *)&onboard_dev[1]; 330 onboard_dev->dev.device_data = onboard_dev; 331 332 list_add(&onboard_dev->dev.list, &dmi_devices); 333} 334 335static void __init dmi_save_extended_devices(const struct dmi_header *dm) 336{ 337 const u8 *d = (u8 *) dm + 5; 338 339 /* Skip disabled device */ 340 if ((*d & 0x80) == 0) 341 return; 342 343 dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5), 344 dmi_string_nosave(dm, *(d-1))); 345 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1))); 346} 347 348static void __init count_mem_devices(const struct dmi_header *dm, void *v) 349{ 350 if (dm->type != DMI_ENTRY_MEM_DEVICE) 351 return; 352 dmi_memdev_nr++; 353} 354 355static void __init save_mem_devices(const struct dmi_header *dm, void *v) 356{ 357 const char *d = (const char *)dm; 358 static int nr; 359 360 if (dm->type != DMI_ENTRY_MEM_DEVICE) 361 return; 362 if (nr >= dmi_memdev_nr) { 363 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n"); 364 return; 365 } 366 dmi_memdev[nr].handle = get_unaligned(&dm->handle); 367 dmi_memdev[nr].device = dmi_string(dm, d[0x10]); 368 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]); 369 nr++; 370} 371 372void __init dmi_memdev_walk(void) 373{ 374 if (!dmi_available) 375 return; 376 377 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) { 378 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr); 379 if (dmi_memdev) 380 dmi_walk_early(save_mem_devices); 381 } 382} 383 384/* 385 * Process a DMI table entry. Right now all we care about are the BIOS 386 * and machine entries. For 2.5 we should pull the smbus controller info 387 * out of here. 388 */ 389static void __init dmi_decode(const struct dmi_header *dm, void *dummy) 390{ 391 switch (dm->type) { 392 case 0: /* BIOS Information */ 393 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4); 394 dmi_save_ident(dm, DMI_BIOS_VERSION, 5); 395 dmi_save_ident(dm, DMI_BIOS_DATE, 8); 396 break; 397 case 1: /* System Information */ 398 dmi_save_ident(dm, DMI_SYS_VENDOR, 4); 399 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5); 400 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6); 401 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7); 402 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8); 403 break; 404 case 2: /* Base Board Information */ 405 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4); 406 dmi_save_ident(dm, DMI_BOARD_NAME, 5); 407 dmi_save_ident(dm, DMI_BOARD_VERSION, 6); 408 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7); 409 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8); 410 break; 411 case 3: /* Chassis Information */ 412 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4); 413 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5); 414 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6); 415 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7); 416 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8); 417 break; 418 case 10: /* Onboard Devices Information */ 419 dmi_save_devices(dm); 420 break; 421 case 11: /* OEM Strings */ 422 dmi_save_oem_strings_devices(dm); 423 break; 424 case 38: /* IPMI Device Information */ 425 dmi_save_ipmi_device(dm); 426 break; 427 case 41: /* Onboard Devices Extended Information */ 428 dmi_save_extended_devices(dm); 429 } 430} 431 432static int __init print_filtered(char *buf, size_t len, const char *info) 433{ 434 int c = 0; 435 const char *p; 436 437 if (!info) 438 return c; 439 440 for (p = info; *p; p++) 441 if (isprint(*p)) 442 c += scnprintf(buf + c, len - c, "%c", *p); 443 else 444 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff); 445 return c; 446} 447 448static void __init dmi_format_ids(char *buf, size_t len) 449{ 450 int c = 0; 451 const char *board; /* Board Name is optional */ 452 453 c += print_filtered(buf + c, len - c, 454 dmi_get_system_info(DMI_SYS_VENDOR)); 455 c += scnprintf(buf + c, len - c, " "); 456 c += print_filtered(buf + c, len - c, 457 dmi_get_system_info(DMI_PRODUCT_NAME)); 458 459 board = dmi_get_system_info(DMI_BOARD_NAME); 460 if (board) { 461 c += scnprintf(buf + c, len - c, "/"); 462 c += print_filtered(buf + c, len - c, board); 463 } 464 c += scnprintf(buf + c, len - c, ", BIOS "); 465 c += print_filtered(buf + c, len - c, 466 dmi_get_system_info(DMI_BIOS_VERSION)); 467 c += scnprintf(buf + c, len - c, " "); 468 c += print_filtered(buf + c, len - c, 469 dmi_get_system_info(DMI_BIOS_DATE)); 470} 471 472/* 473 * Check for DMI/SMBIOS headers in the system firmware image. Any 474 * SMBIOS header must start 16 bytes before the DMI header, so take a 475 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset 476 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS 477 * takes precedence) and return 0. Otherwise return 1. 478 */ 479static int __init dmi_present(const u8 *buf) 480{ 481 u32 smbios_ver; 482 483 if (memcmp(buf, "_SM_", 4) == 0 && 484 buf[5] < 32 && dmi_checksum(buf, buf[5])) { 485 smbios_ver = get_unaligned_be16(buf + 6); 486 487 /* Some BIOS report weird SMBIOS version, fix that up */ 488 switch (smbios_ver) { 489 case 0x021F: 490 case 0x0221: 491 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 492 smbios_ver & 0xFF, 3); 493 smbios_ver = 0x0203; 494 break; 495 case 0x0233: 496 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6); 497 smbios_ver = 0x0206; 498 break; 499 } 500 } else { 501 smbios_ver = 0; 502 } 503 504 buf += 16; 505 506 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) { 507 if (smbios_ver) 508 dmi_ver = smbios_ver; 509 else 510 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F); 511 dmi_num = get_unaligned_le16(buf + 12); 512 dmi_len = get_unaligned_le16(buf + 6); 513 dmi_base = get_unaligned_le32(buf + 8); 514 515 if (dmi_walk_early(dmi_decode) == 0) { 516 if (smbios_ver) { 517 pr_info("SMBIOS %d.%d present.\n", 518 dmi_ver >> 8, dmi_ver & 0xFF); 519 } else { 520 pr_info("Legacy DMI %d.%d present.\n", 521 dmi_ver >> 8, dmi_ver & 0xFF); 522 } 523 dmi_ver <<= 8; 524 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); 525 printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string); 526 return 0; 527 } 528 } 529 530 return 1; 531} 532 533/* 534 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy 535 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here. 536 */ 537static int __init dmi_smbios3_present(const u8 *buf) 538{ 539 if (memcmp(buf, "_SM3_", 5) == 0 && 540 buf[6] < 32 && dmi_checksum(buf, buf[6])) { 541 dmi_ver = get_unaligned_be32(buf + 6); 542 dmi_ver &= 0xFFFFFF; 543 dmi_num = 0; /* No longer specified */ 544 dmi_len = get_unaligned_le32(buf + 12); 545 dmi_base = get_unaligned_le64(buf + 16); 546 547 if (dmi_walk_early(dmi_decode) == 0) { 548 pr_info("SMBIOS %d.%d.%d present.\n", 549 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF, 550 dmi_ver & 0xFF); 551 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string)); 552 pr_debug("DMI: %s\n", dmi_ids_string); 553 return 0; 554 } 555 } 556 return 1; 557} 558 559void __init dmi_scan_machine(void) 560{ 561 char __iomem *p, *q; 562 char buf[32]; 563 564 if (efi_enabled(EFI_CONFIG_TABLES)) { 565 /* 566 * According to the DMTF SMBIOS reference spec v3.0.0, it is 567 * allowed to define both the 64-bit entry point (smbios3) and 568 * the 32-bit entry point (smbios), in which case they should 569 * either both point to the same SMBIOS structure table, or the 570 * table pointed to by the 64-bit entry point should contain a 571 * superset of the table contents pointed to by the 32-bit entry 572 * point (section 5.2) 573 * This implies that the 64-bit entry point should have 574 * precedence if it is defined and supported by the OS. If we 575 * have the 64-bit entry point, but fail to decode it, fall 576 * back to the legacy one (if available) 577 */ 578 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) { 579 p = dmi_early_remap(efi.smbios3, 32); 580 if (p == NULL) 581 goto error; 582 memcpy_fromio(buf, p, 32); 583 dmi_early_unmap(p, 32); 584 585 if (!dmi_smbios3_present(buf)) { 586 dmi_available = 1; 587 goto out; 588 } 589 } 590 if (efi.smbios == EFI_INVALID_TABLE_ADDR) 591 goto error; 592 593 /* This is called as a core_initcall() because it isn't 594 * needed during early boot. This also means we can 595 * iounmap the space when we're done with it. 596 */ 597 p = dmi_early_remap(efi.smbios, 32); 598 if (p == NULL) 599 goto error; 600 memcpy_fromio(buf, p, 32); 601 dmi_early_unmap(p, 32); 602 603 if (!dmi_present(buf)) { 604 dmi_available = 1; 605 goto out; 606 } 607 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) { 608 p = dmi_early_remap(0xF0000, 0x10000); 609 if (p == NULL) 610 goto error; 611 612 /* 613 * Iterate over all possible DMI header addresses q. 614 * Maintain the 32 bytes around q in buf. On the 615 * first iteration, substitute zero for the 616 * out-of-range bytes so there is no chance of falsely 617 * detecting an SMBIOS header. 618 */ 619 memset(buf, 0, 16); 620 for (q = p; q < p + 0x10000; q += 16) { 621 memcpy_fromio(buf + 16, q, 16); 622 if (!dmi_smbios3_present(buf) || !dmi_present(buf)) { 623 dmi_available = 1; 624 dmi_early_unmap(p, 0x10000); 625 goto out; 626 } 627 memcpy(buf, buf + 16, 16); 628 } 629 dmi_early_unmap(p, 0x10000); 630 } 631 error: 632 pr_info("DMI not present or invalid.\n"); 633 out: 634 dmi_initialized = 1; 635} 636 637/** 638 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack() 639 * 640 * Invoke dump_stack_set_arch_desc() with DMI system information so that 641 * DMI identifiers are printed out on task dumps. Arch boot code should 642 * call this function after dmi_scan_machine() if it wants to print out DMI 643 * identifiers on task dumps. 644 */ 645void __init dmi_set_dump_stack_arch_desc(void) 646{ 647 dump_stack_set_arch_desc("%s", dmi_ids_string); 648} 649 650/** 651 * dmi_matches - check if dmi_system_id structure matches system DMI data 652 * @dmi: pointer to the dmi_system_id structure to check 653 */ 654static bool dmi_matches(const struct dmi_system_id *dmi) 655{ 656 int i; 657 658 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n"); 659 660 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) { 661 int s = dmi->matches[i].slot; 662 if (s == DMI_NONE) 663 break; 664 if (dmi_ident[s]) { 665 if (!dmi->matches[i].exact_match && 666 strstr(dmi_ident[s], dmi->matches[i].substr)) 667 continue; 668 else if (dmi->matches[i].exact_match && 669 !strcmp(dmi_ident[s], dmi->matches[i].substr)) 670 continue; 671 } 672 673 /* No match */ 674 return false; 675 } 676 return true; 677} 678 679/** 680 * dmi_is_end_of_table - check for end-of-table marker 681 * @dmi: pointer to the dmi_system_id structure to check 682 */ 683static bool dmi_is_end_of_table(const struct dmi_system_id *dmi) 684{ 685 return dmi->matches[0].slot == DMI_NONE; 686} 687 688/** 689 * dmi_check_system - check system DMI data 690 * @list: array of dmi_system_id structures to match against 691 * All non-null elements of the list must match 692 * their slot's (field index's) data (i.e., each 693 * list string must be a substring of the specified 694 * DMI slot's string data) to be considered a 695 * successful match. 696 * 697 * Walk the blacklist table running matching functions until someone 698 * returns non zero or we hit the end. Callback function is called for 699 * each successful match. Returns the number of matches. 700 */ 701int dmi_check_system(const struct dmi_system_id *list) 702{ 703 int count = 0; 704 const struct dmi_system_id *d; 705 706 for (d = list; !dmi_is_end_of_table(d); d++) 707 if (dmi_matches(d)) { 708 count++; 709 if (d->callback && d->callback(d)) 710 break; 711 } 712 713 return count; 714} 715EXPORT_SYMBOL(dmi_check_system); 716 717/** 718 * dmi_first_match - find dmi_system_id structure matching system DMI data 719 * @list: array of dmi_system_id structures to match against 720 * All non-null elements of the list must match 721 * their slot's (field index's) data (i.e., each 722 * list string must be a substring of the specified 723 * DMI slot's string data) to be considered a 724 * successful match. 725 * 726 * Walk the blacklist table until the first match is found. Return the 727 * pointer to the matching entry or NULL if there's no match. 728 */ 729const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list) 730{ 731 const struct dmi_system_id *d; 732 733 for (d = list; !dmi_is_end_of_table(d); d++) 734 if (dmi_matches(d)) 735 return d; 736 737 return NULL; 738} 739EXPORT_SYMBOL(dmi_first_match); 740 741/** 742 * dmi_get_system_info - return DMI data value 743 * @field: data index (see enum dmi_field) 744 * 745 * Returns one DMI data value, can be used to perform 746 * complex DMI data checks. 747 */ 748const char *dmi_get_system_info(int field) 749{ 750 return dmi_ident[field]; 751} 752EXPORT_SYMBOL(dmi_get_system_info); 753 754/** 755 * dmi_name_in_serial - Check if string is in the DMI product serial information 756 * @str: string to check for 757 */ 758int dmi_name_in_serial(const char *str) 759{ 760 int f = DMI_PRODUCT_SERIAL; 761 if (dmi_ident[f] && strstr(dmi_ident[f], str)) 762 return 1; 763 return 0; 764} 765 766/** 767 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name 768 * @str: Case sensitive Name 769 */ 770int dmi_name_in_vendors(const char *str) 771{ 772 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE }; 773 int i; 774 for (i = 0; fields[i] != DMI_NONE; i++) { 775 int f = fields[i]; 776 if (dmi_ident[f] && strstr(dmi_ident[f], str)) 777 return 1; 778 } 779 return 0; 780} 781EXPORT_SYMBOL(dmi_name_in_vendors); 782 783/** 784 * dmi_find_device - find onboard device by type/name 785 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types 786 * @name: device name string or %NULL to match all 787 * @from: previous device found in search, or %NULL for new search. 788 * 789 * Iterates through the list of known onboard devices. If a device is 790 * found with a matching @vendor and @device, a pointer to its device 791 * structure is returned. Otherwise, %NULL is returned. 792 * A new search is initiated by passing %NULL as the @from argument. 793 * If @from is not %NULL, searches continue from next device. 794 */ 795const struct dmi_device *dmi_find_device(int type, const char *name, 796 const struct dmi_device *from) 797{ 798 const struct list_head *head = from ? &from->list : &dmi_devices; 799 struct list_head *d; 800 801 for (d = head->next; d != &dmi_devices; d = d->next) { 802 const struct dmi_device *dev = 803 list_entry(d, struct dmi_device, list); 804 805 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) && 806 ((name == NULL) || (strcmp(dev->name, name) == 0))) 807 return dev; 808 } 809 810 return NULL; 811} 812EXPORT_SYMBOL(dmi_find_device); 813 814/** 815 * dmi_get_date - parse a DMI date 816 * @field: data index (see enum dmi_field) 817 * @yearp: optional out parameter for the year 818 * @monthp: optional out parameter for the month 819 * @dayp: optional out parameter for the day 820 * 821 * The date field is assumed to be in the form resembling 822 * [mm[/dd]]/yy[yy] and the result is stored in the out 823 * parameters any or all of which can be omitted. 824 * 825 * If the field doesn't exist, all out parameters are set to zero 826 * and false is returned. Otherwise, true is returned with any 827 * invalid part of date set to zero. 828 * 829 * On return, year, month and day are guaranteed to be in the 830 * range of [0,9999], [0,12] and [0,31] respectively. 831 */ 832bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp) 833{ 834 int year = 0, month = 0, day = 0; 835 bool exists; 836 const char *s, *y; 837 char *e; 838 839 s = dmi_get_system_info(field); 840 exists = s; 841 if (!exists) 842 goto out; 843 844 /* 845 * Determine year first. We assume the date string resembles 846 * mm/dd/yy[yy] but the original code extracted only the year 847 * from the end. Keep the behavior in the spirit of no 848 * surprises. 849 */ 850 y = strrchr(s, '/'); 851 if (!y) 852 goto out; 853 854 y++; 855 year = simple_strtoul(y, &e, 10); 856 if (y != e && year < 100) { /* 2-digit year */ 857 year += 1900; 858 if (year < 1996) /* no dates < spec 1.0 */ 859 year += 100; 860 } 861 if (year > 9999) /* year should fit in %04d */ 862 year = 0; 863 864 /* parse the mm and dd */ 865 month = simple_strtoul(s, &e, 10); 866 if (s == e || *e != '/' || !month || month > 12) { 867 month = 0; 868 goto out; 869 } 870 871 s = e + 1; 872 day = simple_strtoul(s, &e, 10); 873 if (s == y || s == e || *e != '/' || day > 31) 874 day = 0; 875out: 876 if (yearp) 877 *yearp = year; 878 if (monthp) 879 *monthp = month; 880 if (dayp) 881 *dayp = day; 882 return exists; 883} 884EXPORT_SYMBOL(dmi_get_date); 885 886/** 887 * dmi_walk - Walk the DMI table and get called back for every record 888 * @decode: Callback function 889 * @private_data: Private data to be passed to the callback function 890 * 891 * Returns -1 when the DMI table can't be reached, 0 on success. 892 */ 893int dmi_walk(void (*decode)(const struct dmi_header *, void *), 894 void *private_data) 895{ 896 u8 *buf; 897 898 if (!dmi_available) 899 return -1; 900 901 buf = dmi_remap(dmi_base, dmi_len); 902 if (buf == NULL) 903 return -1; 904 905 dmi_table(buf, decode, private_data); 906 907 dmi_unmap(buf); 908 return 0; 909} 910EXPORT_SYMBOL_GPL(dmi_walk); 911 912/** 913 * dmi_match - compare a string to the dmi field (if exists) 914 * @f: DMI field identifier 915 * @str: string to compare the DMI field to 916 * 917 * Returns true if the requested field equals to the str (including NULL). 918 */ 919bool dmi_match(enum dmi_field f, const char *str) 920{ 921 const char *info = dmi_get_system_info(f); 922 923 if (info == NULL || str == NULL) 924 return info == str; 925 926 return !strcmp(info, str); 927} 928EXPORT_SYMBOL_GPL(dmi_match); 929 930void dmi_memdev_name(u16 handle, const char **bank, const char **device) 931{ 932 int n; 933 934 if (dmi_memdev == NULL) 935 return; 936 937 for (n = 0; n < dmi_memdev_nr; n++) { 938 if (handle == dmi_memdev[n].handle) { 939 *bank = dmi_memdev[n].bank; 940 *device = dmi_memdev[n].device; 941 break; 942 } 943 } 944} 945EXPORT_SYMBOL_GPL(dmi_memdev_name); 946