1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/types.h>
3 #include <linux/string.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/ctype.h>
9 #include <linux/memblock.h>
10 #include <linux/random.h>
12 #include <asm/unaligned.h>
14 #ifndef SMBIOS_ENTRY_POINT_SCAN_START
15 #define SMBIOS_ENTRY_POINT_SCAN_START 0xF0000
18 struct kobject *dmi_kobj;
19 EXPORT_SYMBOL_GPL(dmi_kobj);
22 * DMI stands for "Desktop Management Interface". It is part
23 * of and an antecedent to, SMBIOS, which stands for System
24 * Management BIOS. See further: https://www.dmtf.org/standards
26 static const char dmi_empty_string[] = "";
28 static u32 dmi_ver __initdata;
31 static u8 smbios_entry_point[32];
32 static int smbios_entry_point_size;
34 /* DMI system identification string used during boot */
35 static char dmi_ids_string[128] __initdata;
37 static struct dmi_memdev_info {
42 u8 type; /* DDR2, DDR3, DDR4 etc */
44 static int dmi_memdev_nr;
46 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
48 const u8 *bp = ((u8 *) dm) + dm->length;
52 while (--s > 0 && *bp)
55 /* Strings containing only spaces are considered empty */
63 return dmi_empty_string;
66 static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
68 const char *bp = dmi_string_nosave(dm, s);
72 if (bp == dmi_empty_string)
73 return dmi_empty_string;
84 * We have to be cautious here. We have seen BIOSes with DMI pointers
85 * pointing to completely the wrong place for example
87 static void dmi_decode_table(u8 *buf,
88 void (*decode)(const struct dmi_header *, void *),
95 * Stop when we have seen all the items the table claimed to have
96 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
97 * >= 3.0 only) OR we run off the end of the table (should never
98 * happen but sometimes does on bogus implementations.)
100 while ((!dmi_num || i < dmi_num) &&
101 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
102 const struct dmi_header *dm = (const struct dmi_header *)data;
105 * We want to know the total length (formatted area and
106 * strings) before decoding to make sure we won't run off the
107 * table in dmi_decode or dmi_string
110 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
112 if (data - buf < dmi_len - 1)
113 decode(dm, private_data);
119 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
120 * For tables behind a 64-bit entry point, we have no item
121 * count and no exact table length, so stop on end-of-table
122 * marker. For tables behind a 32-bit entry point, we have
123 * seen OEM structures behind the end-of-table marker on
124 * some systems, so don't trust it.
126 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
130 /* Trim DMI table length if needed */
131 if (dmi_len > data - buf)
132 dmi_len = data - buf;
135 static phys_addr_t dmi_base;
137 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
141 u32 orig_dmi_len = dmi_len;
143 buf = dmi_early_remap(dmi_base, orig_dmi_len);
147 dmi_decode_table(buf, decode, NULL);
149 add_device_randomness(buf, dmi_len);
151 dmi_early_unmap(buf, orig_dmi_len);
155 static int __init dmi_checksum(const u8 *buf, u8 len)
160 for (a = 0; a < len; a++)
166 static const char *dmi_ident[DMI_STRING_MAX];
167 static LIST_HEAD(dmi_devices);
173 static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
176 const char *d = (const char *) dm;
179 if (dmi_ident[slot] || dm->length <= string)
182 p = dmi_string(dm, d[string]);
189 static void __init dmi_save_release(const struct dmi_header *dm, int slot,
192 const u8 *minor, *major;
195 /* If the table doesn't have the field, let's return */
196 if (dmi_ident[slot] || dm->length < index)
199 minor = (u8 *) dm + index;
200 major = (u8 *) dm + index - 1;
202 /* As per the spec, if the system doesn't support this field,
205 if (*major == 0xFF && *minor == 0xFF)
212 sprintf(s, "%u.%u", *major, *minor);
217 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
222 int is_ff = 1, is_00 = 1, i;
224 if (dmi_ident[slot] || dm->length < index + 16)
227 d = (u8 *) dm + index;
228 for (i = 0; i < 16 && (is_ff || is_00); i++) {
238 s = dmi_alloc(16*2+4+1);
243 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
244 * the UUID are supposed to be little-endian encoded. The specification
245 * says that this is the defacto standard.
247 if (dmi_ver >= 0x020600)
248 sprintf(s, "%pUl", d);
250 sprintf(s, "%pUb", d);
255 static void __init dmi_save_type(const struct dmi_header *dm, int slot,
261 if (dmi_ident[slot] || dm->length <= index)
268 d = (u8 *) dm + index;
269 sprintf(s, "%u", *d & 0x7F);
273 static void __init dmi_save_one_device(int type, const char *name)
275 struct dmi_device *dev;
277 /* No duplicate device */
278 if (dmi_find_device(type, name, NULL))
281 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
286 strcpy((char *)(dev + 1), name);
287 dev->name = (char *)(dev + 1);
288 dev->device_data = NULL;
289 list_add(&dev->list, &dmi_devices);
292 static void __init dmi_save_devices(const struct dmi_header *dm)
294 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
296 for (i = 0; i < count; i++) {
297 const char *d = (char *)(dm + 1) + (i * 2);
299 /* Skip disabled device */
300 if ((*d & 0x80) == 0)
303 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
307 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
310 struct dmi_device *dev;
312 if (dm->length < 0x05)
315 count = *(u8 *)(dm + 1);
316 for (i = 1; i <= count; i++) {
317 const char *devname = dmi_string(dm, i);
319 if (devname == dmi_empty_string)
322 dev = dmi_alloc(sizeof(*dev));
326 dev->type = DMI_DEV_TYPE_OEM_STRING;
328 dev->device_data = NULL;
330 list_add(&dev->list, &dmi_devices);
334 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
336 struct dmi_device *dev;
339 data = dmi_alloc(dm->length);
343 memcpy(data, dm, dm->length);
345 dev = dmi_alloc(sizeof(*dev));
349 dev->type = DMI_DEV_TYPE_IPMI;
350 dev->name = "IPMI controller";
351 dev->device_data = data;
353 list_add_tail(&dev->list, &dmi_devices);
356 static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
357 int devfn, const char *name, int type)
359 struct dmi_dev_onboard *dev;
361 /* Ignore invalid values */
362 if (type == DMI_DEV_TYPE_DEV_SLOT &&
363 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
366 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
370 dev->instance = instance;
371 dev->segment = segment;
375 strcpy((char *)&dev[1], name);
376 dev->dev.type = type;
377 dev->dev.name = (char *)&dev[1];
378 dev->dev.device_data = dev;
380 list_add(&dev->dev.list, &dmi_devices);
383 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
386 const u8 *d = (u8 *)dm;
388 if (dm->length < 0x0B)
391 /* Skip disabled device */
392 if ((d[0x5] & 0x80) == 0)
395 name = dmi_string_nosave(dm, d[0x4]);
396 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
397 DMI_DEV_TYPE_DEV_ONBOARD);
398 dmi_save_one_device(d[0x5] & 0x7f, name);
401 static void __init dmi_save_system_slot(const struct dmi_header *dm)
403 const u8 *d = (u8 *)dm;
405 /* Need SMBIOS 2.6+ structure */
406 if (dm->length < 0x11)
408 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
409 d[0x10], dmi_string_nosave(dm, d[0x4]),
410 DMI_DEV_TYPE_DEV_SLOT);
413 static void __init count_mem_devices(const struct dmi_header *dm, void *v)
415 if (dm->type != DMI_ENTRY_MEM_DEVICE)
420 static void __init save_mem_devices(const struct dmi_header *dm, void *v)
422 const char *d = (const char *)dm;
427 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x13)
429 if (nr >= dmi_memdev_nr) {
430 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
433 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
434 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
435 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
436 dmi_memdev[nr].type = d[0x12];
438 size = get_unaligned((u16 *)&d[0xC]);
441 else if (size == 0xffff)
443 else if (size & 0x8000)
444 bytes = (u64)(size & 0x7fff) << 10;
445 else if (size != 0x7fff || dm->length < 0x20)
446 bytes = (u64)size << 20;
448 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
450 dmi_memdev[nr].size = bytes;
454 static void __init dmi_memdev_walk(void)
456 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
457 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
459 dmi_walk_early(save_mem_devices);
464 * Process a DMI table entry. Right now all we care about are the BIOS
465 * and machine entries. For 2.5 we should pull the smbus controller info
468 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
471 case 0: /* BIOS Information */
472 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
473 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
474 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
475 dmi_save_release(dm, DMI_BIOS_RELEASE, 21);
476 dmi_save_release(dm, DMI_EC_FIRMWARE_RELEASE, 23);
478 case 1: /* System Information */
479 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
480 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
481 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
482 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
483 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
484 dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
485 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
487 case 2: /* Base Board Information */
488 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
489 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
490 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
491 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
492 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
494 case 3: /* Chassis Information */
495 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
496 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
497 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
498 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
499 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
501 case 9: /* System Slots */
502 dmi_save_system_slot(dm);
504 case 10: /* Onboard Devices Information */
505 dmi_save_devices(dm);
507 case 11: /* OEM Strings */
508 dmi_save_oem_strings_devices(dm);
510 case 38: /* IPMI Device Information */
511 dmi_save_ipmi_device(dm);
513 case 41: /* Onboard Devices Extended Information */
514 dmi_save_extended_devices(dm);
518 static int __init print_filtered(char *buf, size_t len, const char *info)
526 for (p = info; *p; p++)
528 c += scnprintf(buf + c, len - c, "%c", *p);
530 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
534 static void __init dmi_format_ids(char *buf, size_t len)
537 const char *board; /* Board Name is optional */
539 c += print_filtered(buf + c, len - c,
540 dmi_get_system_info(DMI_SYS_VENDOR));
541 c += scnprintf(buf + c, len - c, " ");
542 c += print_filtered(buf + c, len - c,
543 dmi_get_system_info(DMI_PRODUCT_NAME));
545 board = dmi_get_system_info(DMI_BOARD_NAME);
547 c += scnprintf(buf + c, len - c, "/");
548 c += print_filtered(buf + c, len - c, board);
550 c += scnprintf(buf + c, len - c, ", BIOS ");
551 c += print_filtered(buf + c, len - c,
552 dmi_get_system_info(DMI_BIOS_VERSION));
553 c += scnprintf(buf + c, len - c, " ");
554 c += print_filtered(buf + c, len - c,
555 dmi_get_system_info(DMI_BIOS_DATE));
559 * Check for DMI/SMBIOS headers in the system firmware image. Any
560 * SMBIOS header must start 16 bytes before the DMI header, so take a
561 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
562 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
563 * takes precedence) and return 0. Otherwise return 1.
565 static int __init dmi_present(const u8 *buf)
569 if (memcmp(buf, "_SM_", 4) == 0 &&
570 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
571 smbios_ver = get_unaligned_be16(buf + 6);
572 smbios_entry_point_size = buf[5];
573 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
575 /* Some BIOS report weird SMBIOS version, fix that up */
576 switch (smbios_ver) {
579 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
580 smbios_ver & 0xFF, 3);
584 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
594 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
596 dmi_ver = smbios_ver;
598 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
600 dmi_num = get_unaligned_le16(buf + 12);
601 dmi_len = get_unaligned_le16(buf + 6);
602 dmi_base = get_unaligned_le32(buf + 8);
604 if (dmi_walk_early(dmi_decode) == 0) {
606 pr_info("SMBIOS %d.%d present.\n",
607 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
609 smbios_entry_point_size = 15;
610 memcpy(smbios_entry_point, buf,
611 smbios_entry_point_size);
612 pr_info("Legacy DMI %d.%d present.\n",
613 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
615 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
616 pr_info("DMI: %s\n", dmi_ids_string);
625 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
626 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
628 static int __init dmi_smbios3_present(const u8 *buf)
630 if (memcmp(buf, "_SM3_", 5) == 0 &&
631 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
632 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
633 dmi_num = 0; /* No longer specified */
634 dmi_len = get_unaligned_le32(buf + 12);
635 dmi_base = get_unaligned_le64(buf + 16);
636 smbios_entry_point_size = buf[6];
637 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
639 if (dmi_walk_early(dmi_decode) == 0) {
640 pr_info("SMBIOS %d.%d.%d present.\n",
641 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
643 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
644 pr_info("DMI: %s\n", dmi_ids_string);
651 static void __init dmi_scan_machine(void)
656 if (efi_enabled(EFI_CONFIG_TABLES)) {
658 * According to the DMTF SMBIOS reference spec v3.0.0, it is
659 * allowed to define both the 64-bit entry point (smbios3) and
660 * the 32-bit entry point (smbios), in which case they should
661 * either both point to the same SMBIOS structure table, or the
662 * table pointed to by the 64-bit entry point should contain a
663 * superset of the table contents pointed to by the 32-bit entry
664 * point (section 5.2)
665 * This implies that the 64-bit entry point should have
666 * precedence if it is defined and supported by the OS. If we
667 * have the 64-bit entry point, but fail to decode it, fall
668 * back to the legacy one (if available)
670 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
671 p = dmi_early_remap(efi.smbios3, 32);
674 memcpy_fromio(buf, p, 32);
675 dmi_early_unmap(p, 32);
677 if (!dmi_smbios3_present(buf)) {
682 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
685 /* This is called as a core_initcall() because it isn't
686 * needed during early boot. This also means we can
687 * iounmap the space when we're done with it.
689 p = dmi_early_remap(efi.smbios, 32);
692 memcpy_fromio(buf, p, 32);
693 dmi_early_unmap(p, 32);
695 if (!dmi_present(buf)) {
699 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
700 p = dmi_early_remap(SMBIOS_ENTRY_POINT_SCAN_START, 0x10000);
705 * Same logic as above, look for a 64-bit entry point
706 * first, and if not found, fall back to 32-bit entry point.
708 memcpy_fromio(buf, p, 16);
709 for (q = p + 16; q < p + 0x10000; q += 16) {
710 memcpy_fromio(buf + 16, q, 16);
711 if (!dmi_smbios3_present(buf)) {
713 dmi_early_unmap(p, 0x10000);
716 memcpy(buf, buf + 16, 16);
720 * Iterate over all possible DMI header addresses q.
721 * Maintain the 32 bytes around q in buf. On the
722 * first iteration, substitute zero for the
723 * out-of-range bytes so there is no chance of falsely
724 * detecting an SMBIOS header.
727 for (q = p; q < p + 0x10000; q += 16) {
728 memcpy_fromio(buf + 16, q, 16);
729 if (!dmi_present(buf)) {
731 dmi_early_unmap(p, 0x10000);
734 memcpy(buf, buf + 16, 16);
736 dmi_early_unmap(p, 0x10000);
739 pr_info("DMI not present or invalid.\n");
742 static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
743 struct bin_attribute *attr, char *buf,
744 loff_t pos, size_t count)
746 memcpy(buf, attr->private + pos, count);
750 static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
751 static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
753 static int __init dmi_init(void)
755 struct kobject *tables_kobj;
763 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
764 * even after farther error, as it can be used by other modules like
767 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
771 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
775 dmi_table = dmi_remap(dmi_base, dmi_len);
779 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
780 bin_attr_smbios_entry_point.private = smbios_entry_point;
781 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
785 bin_attr_DMI.size = dmi_len;
786 bin_attr_DMI.private = dmi_table;
787 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
791 sysfs_remove_bin_file(tables_kobj,
792 &bin_attr_smbios_entry_point);
794 dmi_unmap(dmi_table);
796 kobject_del(tables_kobj);
797 kobject_put(tables_kobj);
799 pr_err("dmi: Firmware registration failed.\n");
803 subsys_initcall(dmi_init);
806 * dmi_setup - scan and setup DMI system information
808 * Scan the DMI system information. This setups DMI identifiers
809 * (dmi_system_id) for printing it out on task dumps and prepares
810 * DIMM entry information (dmi_memdev_info) from the SMBIOS table
811 * for using this when reporting memory errors.
813 void __init dmi_setup(void)
820 dump_stack_set_arch_desc("%s", dmi_ids_string);
824 * dmi_matches - check if dmi_system_id structure matches system DMI data
825 * @dmi: pointer to the dmi_system_id structure to check
827 static bool dmi_matches(const struct dmi_system_id *dmi)
831 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
832 int s = dmi->matches[i].slot;
835 if (s == DMI_OEM_STRING) {
836 /* DMI_OEM_STRING must be exact match */
837 const struct dmi_device *valid;
839 valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
840 dmi->matches[i].substr, NULL);
843 } else if (dmi_ident[s]) {
844 if (dmi->matches[i].exact_match) {
845 if (!strcmp(dmi_ident[s],
846 dmi->matches[i].substr))
849 if (strstr(dmi_ident[s],
850 dmi->matches[i].substr))
862 * dmi_is_end_of_table - check for end-of-table marker
863 * @dmi: pointer to the dmi_system_id structure to check
865 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
867 return dmi->matches[0].slot == DMI_NONE;
871 * dmi_check_system - check system DMI data
872 * @list: array of dmi_system_id structures to match against
873 * All non-null elements of the list must match
874 * their slot's (field index's) data (i.e., each
875 * list string must be a substring of the specified
876 * DMI slot's string data) to be considered a
879 * Walk the blacklist table running matching functions until someone
880 * returns non zero or we hit the end. Callback function is called for
881 * each successful match. Returns the number of matches.
883 * dmi_setup must be called before this function is called.
885 int dmi_check_system(const struct dmi_system_id *list)
888 const struct dmi_system_id *d;
890 for (d = list; !dmi_is_end_of_table(d); d++)
891 if (dmi_matches(d)) {
893 if (d->callback && d->callback(d))
899 EXPORT_SYMBOL(dmi_check_system);
902 * dmi_first_match - find dmi_system_id structure matching system DMI data
903 * @list: array of dmi_system_id structures to match against
904 * All non-null elements of the list must match
905 * their slot's (field index's) data (i.e., each
906 * list string must be a substring of the specified
907 * DMI slot's string data) to be considered a
910 * Walk the blacklist table until the first match is found. Return the
911 * pointer to the matching entry or NULL if there's no match.
913 * dmi_setup must be called before this function is called.
915 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
917 const struct dmi_system_id *d;
919 for (d = list; !dmi_is_end_of_table(d); d++)
925 EXPORT_SYMBOL(dmi_first_match);
928 * dmi_get_system_info - return DMI data value
929 * @field: data index (see enum dmi_field)
931 * Returns one DMI data value, can be used to perform
932 * complex DMI data checks.
934 const char *dmi_get_system_info(int field)
936 return dmi_ident[field];
938 EXPORT_SYMBOL(dmi_get_system_info);
941 * dmi_name_in_serial - Check if string is in the DMI product serial information
942 * @str: string to check for
944 int dmi_name_in_serial(const char *str)
946 int f = DMI_PRODUCT_SERIAL;
947 if (dmi_ident[f] && strstr(dmi_ident[f], str))
953 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
954 * @str: Case sensitive Name
956 int dmi_name_in_vendors(const char *str)
958 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
960 for (i = 0; fields[i] != DMI_NONE; i++) {
962 if (dmi_ident[f] && strstr(dmi_ident[f], str))
967 EXPORT_SYMBOL(dmi_name_in_vendors);
970 * dmi_find_device - find onboard device by type/name
971 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
972 * @name: device name string or %NULL to match all
973 * @from: previous device found in search, or %NULL for new search.
975 * Iterates through the list of known onboard devices. If a device is
976 * found with a matching @type and @name, a pointer to its device
977 * structure is returned. Otherwise, %NULL is returned.
978 * A new search is initiated by passing %NULL as the @from argument.
979 * If @from is not %NULL, searches continue from next device.
981 const struct dmi_device *dmi_find_device(int type, const char *name,
982 const struct dmi_device *from)
984 const struct list_head *head = from ? &from->list : &dmi_devices;
987 for (d = head->next; d != &dmi_devices; d = d->next) {
988 const struct dmi_device *dev =
989 list_entry(d, struct dmi_device, list);
991 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
992 ((name == NULL) || (strcmp(dev->name, name) == 0)))
998 EXPORT_SYMBOL(dmi_find_device);
1001 * dmi_get_date - parse a DMI date
1002 * @field: data index (see enum dmi_field)
1003 * @yearp: optional out parameter for the year
1004 * @monthp: optional out parameter for the month
1005 * @dayp: optional out parameter for the day
1007 * The date field is assumed to be in the form resembling
1008 * [mm[/dd]]/yy[yy] and the result is stored in the out
1009 * parameters any or all of which can be omitted.
1011 * If the field doesn't exist, all out parameters are set to zero
1012 * and false is returned. Otherwise, true is returned with any
1013 * invalid part of date set to zero.
1015 * On return, year, month and day are guaranteed to be in the
1016 * range of [0,9999], [0,12] and [0,31] respectively.
1018 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
1020 int year = 0, month = 0, day = 0;
1025 s = dmi_get_system_info(field);
1031 * Determine year first. We assume the date string resembles
1032 * mm/dd/yy[yy] but the original code extracted only the year
1033 * from the end. Keep the behavior in the spirit of no
1036 y = strrchr(s, '/');
1041 year = simple_strtoul(y, &e, 10);
1042 if (y != e && year < 100) { /* 2-digit year */
1044 if (year < 1996) /* no dates < spec 1.0 */
1047 if (year > 9999) /* year should fit in %04d */
1050 /* parse the mm and dd */
1051 month = simple_strtoul(s, &e, 10);
1052 if (s == e || *e != '/' || !month || month > 12) {
1058 day = simple_strtoul(s, &e, 10);
1059 if (s == y || s == e || *e != '/' || day > 31)
1070 EXPORT_SYMBOL(dmi_get_date);
1073 * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field
1075 * Returns year on success, -ENXIO if DMI is not selected,
1076 * or a different negative error code if DMI field is not present
1079 int dmi_get_bios_year(void)
1084 exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
1088 return year ? year : -ERANGE;
1090 EXPORT_SYMBOL(dmi_get_bios_year);
1093 * dmi_walk - Walk the DMI table and get called back for every record
1094 * @decode: Callback function
1095 * @private_data: Private data to be passed to the callback function
1097 * Returns 0 on success, -ENXIO if DMI is not selected or not present,
1098 * or a different negative error code if DMI walking fails.
1100 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
1108 buf = dmi_remap(dmi_base, dmi_len);
1112 dmi_decode_table(buf, decode, private_data);
1117 EXPORT_SYMBOL_GPL(dmi_walk);
1120 * dmi_match - compare a string to the dmi field (if exists)
1121 * @f: DMI field identifier
1122 * @str: string to compare the DMI field to
1124 * Returns true if the requested field equals to the str (including NULL).
1126 bool dmi_match(enum dmi_field f, const char *str)
1128 const char *info = dmi_get_system_info(f);
1130 if (info == NULL || str == NULL)
1133 return !strcmp(info, str);
1135 EXPORT_SYMBOL_GPL(dmi_match);
1137 void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1141 if (dmi_memdev == NULL)
1144 for (n = 0; n < dmi_memdev_nr; n++) {
1145 if (handle == dmi_memdev[n].handle) {
1146 *bank = dmi_memdev[n].bank;
1147 *device = dmi_memdev[n].device;
1152 EXPORT_SYMBOL_GPL(dmi_memdev_name);
1154 u64 dmi_memdev_size(u16 handle)
1159 for (n = 0; n < dmi_memdev_nr; n++) {
1160 if (handle == dmi_memdev[n].handle)
1161 return dmi_memdev[n].size;
1166 EXPORT_SYMBOL_GPL(dmi_memdev_size);
1169 * dmi_memdev_type - get the memory type
1170 * @handle: DMI structure handle
1172 * Return the DMI memory type of the module in the slot associated with the
1173 * given DMI handle, or 0x0 if no such DMI handle exists.
1175 u8 dmi_memdev_type(u16 handle)
1180 for (n = 0; n < dmi_memdev_nr; n++) {
1181 if (handle == dmi_memdev[n].handle)
1182 return dmi_memdev[n].type;
1185 return 0x0; /* Not a valid value */
1187 EXPORT_SYMBOL_GPL(dmi_memdev_type);
1190 * dmi_memdev_handle - get the DMI handle of a memory slot
1191 * @slot: slot number
1193 * Return the DMI handle associated with a given memory slot, or %0xFFFF
1194 * if there is no such slot.
1196 u16 dmi_memdev_handle(int slot)
1198 if (dmi_memdev && slot >= 0 && slot < dmi_memdev_nr)
1199 return dmi_memdev[slot].handle;
1201 return 0xffff; /* Not a valid value */
1203 EXPORT_SYMBOL_GPL(dmi_memdev_handle);