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