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>
8 #include <linux/memblock.h>
9 #include <linux/random.h>
11 #include <asm/unaligned.h>
13 struct kobject *dmi_kobj;
14 EXPORT_SYMBOL_GPL(dmi_kobj);
17 * DMI stands for "Desktop Management Interface". It is part
18 * of and an antecedent to, SMBIOS, which stands for System
19 * Management BIOS. See further: http://www.dmtf.org/standards
21 static const char dmi_empty_string[] = "";
23 static u32 dmi_ver __initdata;
26 static u8 smbios_entry_point[32];
27 static int smbios_entry_point_size;
29 /* DMI system identification string used during boot */
30 static char dmi_ids_string[128] __initdata;
32 static struct dmi_memdev_info {
38 static int dmi_memdev_nr;
40 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
42 const u8 *bp = ((u8 *) dm) + dm->length;
46 while (--s > 0 && *bp)
49 /* Strings containing only spaces are considered empty */
57 return dmi_empty_string;
60 static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
62 const char *bp = dmi_string_nosave(dm, s);
66 if (bp == dmi_empty_string)
67 return dmi_empty_string;
78 * We have to be cautious here. We have seen BIOSes with DMI pointers
79 * pointing to completely the wrong place for example
81 static void dmi_decode_table(u8 *buf,
82 void (*decode)(const struct dmi_header *, void *),
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 (SMBIOS
91 * >= 3.0 only) OR we run off the end of the table (should never
92 * happen but sometimes does on bogus implementations.)
94 while ((!dmi_num || i < dmi_num) &&
95 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
96 const struct dmi_header *dm = (const struct dmi_header *)data;
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
104 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
106 if (data - buf < dmi_len - 1)
107 decode(dm, private_data);
113 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
114 * For tables behind a 64-bit entry point, we have no item
115 * count and no exact table length, so stop on end-of-table
116 * marker. For tables behind a 32-bit entry point, we have
117 * seen OEM structures behind the end-of-table marker on
118 * some systems, so don't trust it.
120 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
124 /* Trim DMI table length if needed */
125 if (dmi_len > data - buf)
126 dmi_len = data - buf;
129 static phys_addr_t dmi_base;
131 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
135 u32 orig_dmi_len = dmi_len;
137 buf = dmi_early_remap(dmi_base, orig_dmi_len);
141 dmi_decode_table(buf, decode, NULL);
143 add_device_randomness(buf, dmi_len);
145 dmi_early_unmap(buf, orig_dmi_len);
149 static int __init dmi_checksum(const u8 *buf, u8 len)
154 for (a = 0; a < len; a++)
160 static const char *dmi_ident[DMI_STRING_MAX];
161 static LIST_HEAD(dmi_devices);
167 static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
170 const char *d = (const char *) dm;
173 if (dmi_ident[slot] || dm->length <= string)
176 p = dmi_string(dm, d[string]);
183 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
188 int is_ff = 1, is_00 = 1, i;
190 if (dmi_ident[slot] || dm->length < index + 16)
193 d = (u8 *) dm + index;
194 for (i = 0; i < 16 && (is_ff || is_00); i++) {
204 s = dmi_alloc(16*2+4+1);
209 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
210 * the UUID are supposed to be little-endian encoded. The specification
211 * says that this is the defacto standard.
213 if (dmi_ver >= 0x020600)
214 sprintf(s, "%pUl", d);
216 sprintf(s, "%pUb", d);
221 static void __init dmi_save_type(const struct dmi_header *dm, int slot,
227 if (dmi_ident[slot] || dm->length <= index)
234 d = (u8 *) dm + index;
235 sprintf(s, "%u", *d & 0x7F);
239 static void __init dmi_save_one_device(int type, const char *name)
241 struct dmi_device *dev;
243 /* No duplicate device */
244 if (dmi_find_device(type, name, NULL))
247 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
252 strcpy((char *)(dev + 1), name);
253 dev->name = (char *)(dev + 1);
254 dev->device_data = NULL;
255 list_add(&dev->list, &dmi_devices);
258 static void __init dmi_save_devices(const struct dmi_header *dm)
260 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
262 for (i = 0; i < count; i++) {
263 const char *d = (char *)(dm + 1) + (i * 2);
265 /* Skip disabled device */
266 if ((*d & 0x80) == 0)
269 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
273 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
276 struct dmi_device *dev;
278 if (dm->length < 0x05)
281 count = *(u8 *)(dm + 1);
282 for (i = 1; i <= count; i++) {
283 const char *devname = dmi_string(dm, i);
285 if (devname == dmi_empty_string)
288 dev = dmi_alloc(sizeof(*dev));
292 dev->type = DMI_DEV_TYPE_OEM_STRING;
294 dev->device_data = NULL;
296 list_add(&dev->list, &dmi_devices);
300 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
302 struct dmi_device *dev;
305 data = dmi_alloc(dm->length);
309 memcpy(data, dm, dm->length);
311 dev = dmi_alloc(sizeof(*dev));
315 dev->type = DMI_DEV_TYPE_IPMI;
316 dev->name = "IPMI controller";
317 dev->device_data = data;
319 list_add_tail(&dev->list, &dmi_devices);
322 static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
323 int devfn, const char *name, int type)
325 struct dmi_dev_onboard *dev;
327 /* Ignore invalid values */
328 if (type == DMI_DEV_TYPE_DEV_SLOT &&
329 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
332 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
336 dev->instance = instance;
337 dev->segment = segment;
341 strcpy((char *)&dev[1], name);
342 dev->dev.type = type;
343 dev->dev.name = (char *)&dev[1];
344 dev->dev.device_data = dev;
346 list_add(&dev->dev.list, &dmi_devices);
349 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
352 const u8 *d = (u8 *)dm;
354 if (dm->length < 0x0B)
357 /* Skip disabled device */
358 if ((d[0x5] & 0x80) == 0)
361 name = dmi_string_nosave(dm, d[0x4]);
362 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
363 DMI_DEV_TYPE_DEV_ONBOARD);
364 dmi_save_one_device(d[0x5] & 0x7f, name);
367 static void __init dmi_save_system_slot(const struct dmi_header *dm)
369 const u8 *d = (u8 *)dm;
371 /* Need SMBIOS 2.6+ structure */
372 if (dm->length < 0x11)
374 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
375 d[0x10], dmi_string_nosave(dm, d[0x4]),
376 DMI_DEV_TYPE_DEV_SLOT);
379 static void __init count_mem_devices(const struct dmi_header *dm, void *v)
381 if (dm->type != DMI_ENTRY_MEM_DEVICE)
386 static void __init save_mem_devices(const struct dmi_header *dm, void *v)
388 const char *d = (const char *)dm;
393 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12)
395 if (nr >= dmi_memdev_nr) {
396 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
399 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
400 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
401 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
403 size = get_unaligned((u16 *)&d[0xC]);
406 else if (size == 0xffff)
408 else if (size & 0x8000)
409 bytes = (u64)(size & 0x7fff) << 10;
410 else if (size != 0x7fff)
411 bytes = (u64)size << 20;
413 bytes = (u64)get_unaligned((u32 *)&d[0x1C]) << 20;
415 dmi_memdev[nr].size = bytes;
419 static void __init dmi_memdev_walk(void)
421 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
422 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
424 dmi_walk_early(save_mem_devices);
429 * Process a DMI table entry. Right now all we care about are the BIOS
430 * and machine entries. For 2.5 we should pull the smbus controller info
433 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
436 case 0: /* BIOS Information */
437 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
438 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
439 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
441 case 1: /* System Information */
442 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
443 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
444 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
445 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
446 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
447 dmi_save_ident(dm, DMI_PRODUCT_SKU, 25);
448 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
450 case 2: /* Base Board Information */
451 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
452 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
453 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
454 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
455 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
457 case 3: /* Chassis Information */
458 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
459 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
460 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
461 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
462 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
464 case 9: /* System Slots */
465 dmi_save_system_slot(dm);
467 case 10: /* Onboard Devices Information */
468 dmi_save_devices(dm);
470 case 11: /* OEM Strings */
471 dmi_save_oem_strings_devices(dm);
473 case 38: /* IPMI Device Information */
474 dmi_save_ipmi_device(dm);
476 case 41: /* Onboard Devices Extended Information */
477 dmi_save_extended_devices(dm);
481 static int __init print_filtered(char *buf, size_t len, const char *info)
489 for (p = info; *p; p++)
491 c += scnprintf(buf + c, len - c, "%c", *p);
493 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
497 static void __init dmi_format_ids(char *buf, size_t len)
500 const char *board; /* Board Name is optional */
502 c += print_filtered(buf + c, len - c,
503 dmi_get_system_info(DMI_SYS_VENDOR));
504 c += scnprintf(buf + c, len - c, " ");
505 c += print_filtered(buf + c, len - c,
506 dmi_get_system_info(DMI_PRODUCT_NAME));
508 board = dmi_get_system_info(DMI_BOARD_NAME);
510 c += scnprintf(buf + c, len - c, "/");
511 c += print_filtered(buf + c, len - c, board);
513 c += scnprintf(buf + c, len - c, ", BIOS ");
514 c += print_filtered(buf + c, len - c,
515 dmi_get_system_info(DMI_BIOS_VERSION));
516 c += scnprintf(buf + c, len - c, " ");
517 c += print_filtered(buf + c, len - c,
518 dmi_get_system_info(DMI_BIOS_DATE));
522 * Check for DMI/SMBIOS headers in the system firmware image. Any
523 * SMBIOS header must start 16 bytes before the DMI header, so take a
524 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
525 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
526 * takes precedence) and return 0. Otherwise return 1.
528 static int __init dmi_present(const u8 *buf)
532 if (memcmp(buf, "_SM_", 4) == 0 &&
533 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
534 smbios_ver = get_unaligned_be16(buf + 6);
535 smbios_entry_point_size = buf[5];
536 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
538 /* Some BIOS report weird SMBIOS version, fix that up */
539 switch (smbios_ver) {
542 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
543 smbios_ver & 0xFF, 3);
547 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
557 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
559 dmi_ver = smbios_ver;
561 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
563 dmi_num = get_unaligned_le16(buf + 12);
564 dmi_len = get_unaligned_le16(buf + 6);
565 dmi_base = get_unaligned_le32(buf + 8);
567 if (dmi_walk_early(dmi_decode) == 0) {
569 pr_info("SMBIOS %d.%d present.\n",
570 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
572 smbios_entry_point_size = 15;
573 memcpy(smbios_entry_point, buf,
574 smbios_entry_point_size);
575 pr_info("Legacy DMI %d.%d present.\n",
576 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
578 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
579 pr_info("DMI: %s\n", dmi_ids_string);
588 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
589 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
591 static int __init dmi_smbios3_present(const u8 *buf)
593 if (memcmp(buf, "_SM3_", 5) == 0 &&
594 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
595 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
596 dmi_num = 0; /* No longer specified */
597 dmi_len = get_unaligned_le32(buf + 12);
598 dmi_base = get_unaligned_le64(buf + 16);
599 smbios_entry_point_size = buf[6];
600 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
602 if (dmi_walk_early(dmi_decode) == 0) {
603 pr_info("SMBIOS %d.%d.%d present.\n",
604 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
606 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
607 pr_info("DMI: %s\n", dmi_ids_string);
614 static void __init dmi_scan_machine(void)
619 if (efi_enabled(EFI_CONFIG_TABLES)) {
621 * According to the DMTF SMBIOS reference spec v3.0.0, it is
622 * allowed to define both the 64-bit entry point (smbios3) and
623 * the 32-bit entry point (smbios), in which case they should
624 * either both point to the same SMBIOS structure table, or the
625 * table pointed to by the 64-bit entry point should contain a
626 * superset of the table contents pointed to by the 32-bit entry
627 * point (section 5.2)
628 * This implies that the 64-bit entry point should have
629 * precedence if it is defined and supported by the OS. If we
630 * have the 64-bit entry point, but fail to decode it, fall
631 * back to the legacy one (if available)
633 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
634 p = dmi_early_remap(efi.smbios3, 32);
637 memcpy_fromio(buf, p, 32);
638 dmi_early_unmap(p, 32);
640 if (!dmi_smbios3_present(buf)) {
645 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
648 /* This is called as a core_initcall() because it isn't
649 * needed during early boot. This also means we can
650 * iounmap the space when we're done with it.
652 p = dmi_early_remap(efi.smbios, 32);
655 memcpy_fromio(buf, p, 32);
656 dmi_early_unmap(p, 32);
658 if (!dmi_present(buf)) {
662 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
663 p = dmi_early_remap(0xF0000, 0x10000);
668 * Same logic as above, look for a 64-bit entry point
669 * first, and if not found, fall back to 32-bit entry point.
671 memcpy_fromio(buf, p, 16);
672 for (q = p + 16; q < p + 0x10000; q += 16) {
673 memcpy_fromio(buf + 16, q, 16);
674 if (!dmi_smbios3_present(buf)) {
676 dmi_early_unmap(p, 0x10000);
679 memcpy(buf, buf + 16, 16);
683 * Iterate over all possible DMI header addresses q.
684 * Maintain the 32 bytes around q in buf. On the
685 * first iteration, substitute zero for the
686 * out-of-range bytes so there is no chance of falsely
687 * detecting an SMBIOS header.
690 for (q = p; q < p + 0x10000; q += 16) {
691 memcpy_fromio(buf + 16, q, 16);
692 if (!dmi_present(buf)) {
694 dmi_early_unmap(p, 0x10000);
697 memcpy(buf, buf + 16, 16);
699 dmi_early_unmap(p, 0x10000);
702 pr_info("DMI not present or invalid.\n");
705 static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
706 struct bin_attribute *attr, char *buf,
707 loff_t pos, size_t count)
709 memcpy(buf, attr->private + pos, count);
713 static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
714 static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
716 static int __init dmi_init(void)
718 struct kobject *tables_kobj;
726 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
727 * even after farther error, as it can be used by other modules like
730 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
734 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
738 dmi_table = dmi_remap(dmi_base, dmi_len);
742 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
743 bin_attr_smbios_entry_point.private = smbios_entry_point;
744 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
748 bin_attr_DMI.size = dmi_len;
749 bin_attr_DMI.private = dmi_table;
750 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
754 sysfs_remove_bin_file(tables_kobj,
755 &bin_attr_smbios_entry_point);
757 dmi_unmap(dmi_table);
759 kobject_del(tables_kobj);
760 kobject_put(tables_kobj);
762 pr_err("dmi: Firmware registration failed.\n");
766 subsys_initcall(dmi_init);
769 * dmi_setup - scan and setup DMI system information
771 * Scan the DMI system information. This setups DMI identifiers
772 * (dmi_system_id) for printing it out on task dumps and prepares
773 * DIMM entry information (dmi_memdev_info) from the SMBIOS table
774 * for using this when reporting memory errors.
776 void __init dmi_setup(void)
783 dump_stack_set_arch_desc("%s", dmi_ids_string);
787 * dmi_matches - check if dmi_system_id structure matches system DMI data
788 * @dmi: pointer to the dmi_system_id structure to check
790 static bool dmi_matches(const struct dmi_system_id *dmi)
794 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
795 int s = dmi->matches[i].slot;
798 if (s == DMI_OEM_STRING) {
799 /* DMI_OEM_STRING must be exact match */
800 const struct dmi_device *valid;
802 valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING,
803 dmi->matches[i].substr, NULL);
806 } else if (dmi_ident[s]) {
807 if (dmi->matches[i].exact_match) {
808 if (!strcmp(dmi_ident[s],
809 dmi->matches[i].substr))
812 if (strstr(dmi_ident[s],
813 dmi->matches[i].substr))
825 * dmi_is_end_of_table - check for end-of-table marker
826 * @dmi: pointer to the dmi_system_id structure to check
828 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
830 return dmi->matches[0].slot == DMI_NONE;
834 * dmi_check_system - check system DMI data
835 * @list: array of dmi_system_id structures to match against
836 * All non-null elements of the list must match
837 * their slot's (field index's) data (i.e., each
838 * list string must be a substring of the specified
839 * DMI slot's string data) to be considered a
842 * Walk the blacklist table running matching functions until someone
843 * returns non zero or we hit the end. Callback function is called for
844 * each successful match. Returns the number of matches.
846 * dmi_setup must be called before this function is called.
848 int dmi_check_system(const struct dmi_system_id *list)
851 const struct dmi_system_id *d;
853 for (d = list; !dmi_is_end_of_table(d); d++)
854 if (dmi_matches(d)) {
856 if (d->callback && d->callback(d))
862 EXPORT_SYMBOL(dmi_check_system);
865 * dmi_first_match - find dmi_system_id structure matching system DMI data
866 * @list: array of dmi_system_id structures to match against
867 * All non-null elements of the list must match
868 * their slot's (field index's) data (i.e., each
869 * list string must be a substring of the specified
870 * DMI slot's string data) to be considered a
873 * Walk the blacklist table until the first match is found. Return the
874 * pointer to the matching entry or NULL if there's no match.
876 * dmi_setup must be called before this function is called.
878 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
880 const struct dmi_system_id *d;
882 for (d = list; !dmi_is_end_of_table(d); d++)
888 EXPORT_SYMBOL(dmi_first_match);
891 * dmi_get_system_info - return DMI data value
892 * @field: data index (see enum dmi_field)
894 * Returns one DMI data value, can be used to perform
895 * complex DMI data checks.
897 const char *dmi_get_system_info(int field)
899 return dmi_ident[field];
901 EXPORT_SYMBOL(dmi_get_system_info);
904 * dmi_name_in_serial - Check if string is in the DMI product serial information
905 * @str: string to check for
907 int dmi_name_in_serial(const char *str)
909 int f = DMI_PRODUCT_SERIAL;
910 if (dmi_ident[f] && strstr(dmi_ident[f], str))
916 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
917 * @str: Case sensitive Name
919 int dmi_name_in_vendors(const char *str)
921 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
923 for (i = 0; fields[i] != DMI_NONE; i++) {
925 if (dmi_ident[f] && strstr(dmi_ident[f], str))
930 EXPORT_SYMBOL(dmi_name_in_vendors);
933 * dmi_find_device - find onboard device by type/name
934 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
935 * @name: device name string or %NULL to match all
936 * @from: previous device found in search, or %NULL for new search.
938 * Iterates through the list of known onboard devices. If a device is
939 * found with a matching @type and @name, a pointer to its device
940 * structure is returned. Otherwise, %NULL is returned.
941 * A new search is initiated by passing %NULL as the @from argument.
942 * If @from is not %NULL, searches continue from next device.
944 const struct dmi_device *dmi_find_device(int type, const char *name,
945 const struct dmi_device *from)
947 const struct list_head *head = from ? &from->list : &dmi_devices;
950 for (d = head->next; d != &dmi_devices; d = d->next) {
951 const struct dmi_device *dev =
952 list_entry(d, struct dmi_device, list);
954 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
955 ((name == NULL) || (strcmp(dev->name, name) == 0)))
961 EXPORT_SYMBOL(dmi_find_device);
964 * dmi_get_date - parse a DMI date
965 * @field: data index (see enum dmi_field)
966 * @yearp: optional out parameter for the year
967 * @monthp: optional out parameter for the month
968 * @dayp: optional out parameter for the day
970 * The date field is assumed to be in the form resembling
971 * [mm[/dd]]/yy[yy] and the result is stored in the out
972 * parameters any or all of which can be omitted.
974 * If the field doesn't exist, all out parameters are set to zero
975 * and false is returned. Otherwise, true is returned with any
976 * invalid part of date set to zero.
978 * On return, year, month and day are guaranteed to be in the
979 * range of [0,9999], [0,12] and [0,31] respectively.
981 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
983 int year = 0, month = 0, day = 0;
988 s = dmi_get_system_info(field);
994 * Determine year first. We assume the date string resembles
995 * mm/dd/yy[yy] but the original code extracted only the year
996 * from the end. Keep the behavior in the spirit of no
1004 year = simple_strtoul(y, &e, 10);
1005 if (y != e && year < 100) { /* 2-digit year */
1007 if (year < 1996) /* no dates < spec 1.0 */
1010 if (year > 9999) /* year should fit in %04d */
1013 /* parse the mm and dd */
1014 month = simple_strtoul(s, &e, 10);
1015 if (s == e || *e != '/' || !month || month > 12) {
1021 day = simple_strtoul(s, &e, 10);
1022 if (s == y || s == e || *e != '/' || day > 31)
1033 EXPORT_SYMBOL(dmi_get_date);
1036 * dmi_get_bios_year - get a year out of DMI_BIOS_DATE field
1038 * Returns year on success, -ENXIO if DMI is not selected,
1039 * or a different negative error code if DMI field is not present
1042 int dmi_get_bios_year(void)
1047 exists = dmi_get_date(DMI_BIOS_DATE, &year, NULL, NULL);
1051 return year ? year : -ERANGE;
1053 EXPORT_SYMBOL(dmi_get_bios_year);
1056 * dmi_walk - Walk the DMI table and get called back for every record
1057 * @decode: Callback function
1058 * @private_data: Private data to be passed to the callback function
1060 * Returns 0 on success, -ENXIO if DMI is not selected or not present,
1061 * or a different negative error code if DMI walking fails.
1063 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
1071 buf = dmi_remap(dmi_base, dmi_len);
1075 dmi_decode_table(buf, decode, private_data);
1080 EXPORT_SYMBOL_GPL(dmi_walk);
1083 * dmi_match - compare a string to the dmi field (if exists)
1084 * @f: DMI field identifier
1085 * @str: string to compare the DMI field to
1087 * Returns true if the requested field equals to the str (including NULL).
1089 bool dmi_match(enum dmi_field f, const char *str)
1091 const char *info = dmi_get_system_info(f);
1093 if (info == NULL || str == NULL)
1096 return !strcmp(info, str);
1098 EXPORT_SYMBOL_GPL(dmi_match);
1100 void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1104 if (dmi_memdev == NULL)
1107 for (n = 0; n < dmi_memdev_nr; n++) {
1108 if (handle == dmi_memdev[n].handle) {
1109 *bank = dmi_memdev[n].bank;
1110 *device = dmi_memdev[n].device;
1115 EXPORT_SYMBOL_GPL(dmi_memdev_name);
1117 u64 dmi_memdev_size(u16 handle)
1122 for (n = 0; n < dmi_memdev_nr; n++) {
1123 if (handle == dmi_memdev[n].handle)
1124 return dmi_memdev[n].size;
1129 EXPORT_SYMBOL_GPL(dmi_memdev_size);