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/bootmem.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 {
37 static int dmi_memdev_nr;
39 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
41 const u8 *bp = ((u8 *) dm) + dm->length;
45 while (s > 0 && *bp) {
51 size_t len = strlen(bp)+1;
52 size_t cmp_len = len > 8 ? 8 : len;
54 if (!memcmp(bp, dmi_empty_string, cmp_len))
55 return dmi_empty_string;
63 static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
65 const char *bp = dmi_string_nosave(dm, s);
69 if (bp == dmi_empty_string)
70 return dmi_empty_string;
81 * We have to be cautious here. We have seen BIOSes with DMI pointers
82 * pointing to completely the wrong place for example
84 static void dmi_decode_table(u8 *buf,
85 void (*decode)(const struct dmi_header *, void *),
92 * Stop when we have seen all the items the table claimed to have
93 * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
94 * >= 3.0 only) OR we run off the end of the table (should never
95 * happen but sometimes does on bogus implementations.)
97 while ((!dmi_num || i < dmi_num) &&
98 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
99 const struct dmi_header *dm = (const struct dmi_header *)data;
102 * We want to know the total length (formatted area and
103 * strings) before decoding to make sure we won't run off the
104 * table in dmi_decode or dmi_string
107 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
109 if (data - buf < dmi_len - 1)
110 decode(dm, private_data);
116 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
117 * For tables behind a 64-bit entry point, we have no item
118 * count and no exact table length, so stop on end-of-table
119 * marker. For tables behind a 32-bit entry point, we have
120 * seen OEM structures behind the end-of-table marker on
121 * some systems, so don't trust it.
123 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
127 /* Trim DMI table length if needed */
128 if (dmi_len > data - buf)
129 dmi_len = data - buf;
132 static phys_addr_t dmi_base;
134 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
138 u32 orig_dmi_len = dmi_len;
140 buf = dmi_early_remap(dmi_base, orig_dmi_len);
144 dmi_decode_table(buf, decode, NULL);
146 add_device_randomness(buf, dmi_len);
148 dmi_early_unmap(buf, orig_dmi_len);
152 static int __init dmi_checksum(const u8 *buf, u8 len)
157 for (a = 0; a < len; a++)
163 static const char *dmi_ident[DMI_STRING_MAX];
164 static LIST_HEAD(dmi_devices);
170 static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
173 const char *d = (const char *) dm;
176 if (dmi_ident[slot] || dm->length <= string)
179 p = dmi_string(dm, d[string]);
186 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
191 int is_ff = 1, is_00 = 1, i;
193 if (dmi_ident[slot] || dm->length <= index + 16)
196 d = (u8 *) dm + index;
197 for (i = 0; i < 16 && (is_ff || is_00); i++) {
207 s = dmi_alloc(16*2+4+1);
212 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
213 * the UUID are supposed to be little-endian encoded. The specification
214 * says that this is the defacto standard.
216 if (dmi_ver >= 0x020600)
217 sprintf(s, "%pUL", d);
219 sprintf(s, "%pUB", d);
224 static void __init dmi_save_type(const struct dmi_header *dm, int slot,
230 if (dmi_ident[slot] || dm->length <= index)
237 d = (u8 *) dm + index;
238 sprintf(s, "%u", *d & 0x7F);
242 static void __init dmi_save_one_device(int type, const char *name)
244 struct dmi_device *dev;
246 /* No duplicate device */
247 if (dmi_find_device(type, name, NULL))
250 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
255 strcpy((char *)(dev + 1), name);
256 dev->name = (char *)(dev + 1);
257 dev->device_data = NULL;
258 list_add(&dev->list, &dmi_devices);
261 static void __init dmi_save_devices(const struct dmi_header *dm)
263 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
265 for (i = 0; i < count; i++) {
266 const char *d = (char *)(dm + 1) + (i * 2);
268 /* Skip disabled device */
269 if ((*d & 0x80) == 0)
272 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
276 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
279 struct dmi_device *dev;
281 if (dm->length < 0x05)
284 count = *(u8 *)(dm + 1);
285 for (i = 1; i <= count; i++) {
286 const char *devname = dmi_string(dm, i);
288 if (devname == dmi_empty_string)
291 dev = dmi_alloc(sizeof(*dev));
295 dev->type = DMI_DEV_TYPE_OEM_STRING;
297 dev->device_data = NULL;
299 list_add(&dev->list, &dmi_devices);
303 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
305 struct dmi_device *dev;
308 data = dmi_alloc(dm->length);
312 memcpy(data, dm, dm->length);
314 dev = dmi_alloc(sizeof(*dev));
318 dev->type = DMI_DEV_TYPE_IPMI;
319 dev->name = "IPMI controller";
320 dev->device_data = data;
322 list_add_tail(&dev->list, &dmi_devices);
325 static void __init dmi_save_dev_pciaddr(int instance, int segment, int bus,
326 int devfn, const char *name, int type)
328 struct dmi_dev_onboard *dev;
330 /* Ignore invalid values */
331 if (type == DMI_DEV_TYPE_DEV_SLOT &&
332 segment == 0xFFFF && bus == 0xFF && devfn == 0xFF)
335 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
339 dev->instance = instance;
340 dev->segment = segment;
344 strcpy((char *)&dev[1], name);
345 dev->dev.type = type;
346 dev->dev.name = (char *)&dev[1];
347 dev->dev.device_data = dev;
349 list_add(&dev->dev.list, &dmi_devices);
352 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
355 const u8 *d = (u8 *)dm;
357 if (dm->length < 0x0B)
360 /* Skip disabled device */
361 if ((d[0x5] & 0x80) == 0)
364 name = dmi_string_nosave(dm, d[0x4]);
365 dmi_save_dev_pciaddr(d[0x6], *(u16 *)(d + 0x7), d[0x9], d[0xA], name,
366 DMI_DEV_TYPE_DEV_ONBOARD);
367 dmi_save_one_device(d[0x5] & 0x7f, name);
370 static void __init dmi_save_system_slot(const struct dmi_header *dm)
372 const u8 *d = (u8 *)dm;
374 /* Need SMBIOS 2.6+ structure */
375 if (dm->length < 0x11)
377 dmi_save_dev_pciaddr(*(u16 *)(d + 0x9), *(u16 *)(d + 0xD), d[0xF],
378 d[0x10], dmi_string_nosave(dm, d[0x4]),
379 DMI_DEV_TYPE_DEV_SLOT);
382 static void __init count_mem_devices(const struct dmi_header *dm, void *v)
384 if (dm->type != DMI_ENTRY_MEM_DEVICE)
389 static void __init save_mem_devices(const struct dmi_header *dm, void *v)
391 const char *d = (const char *)dm;
394 if (dm->type != DMI_ENTRY_MEM_DEVICE || dm->length < 0x12)
396 if (nr >= dmi_memdev_nr) {
397 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
400 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
401 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
402 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
406 void __init dmi_memdev_walk(void)
411 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
412 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
414 dmi_walk_early(save_mem_devices);
419 * Process a DMI table entry. Right now all we care about are the BIOS
420 * and machine entries. For 2.5 we should pull the smbus controller info
423 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
426 case 0: /* BIOS Information */
427 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
428 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
429 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
431 case 1: /* System Information */
432 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
433 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
434 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
435 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
436 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
437 dmi_save_ident(dm, DMI_PRODUCT_FAMILY, 26);
439 case 2: /* Base Board Information */
440 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
441 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
442 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
443 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
444 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
446 case 3: /* Chassis Information */
447 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
448 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
449 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
450 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
451 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
453 case 9: /* System Slots */
454 dmi_save_system_slot(dm);
456 case 10: /* Onboard Devices Information */
457 dmi_save_devices(dm);
459 case 11: /* OEM Strings */
460 dmi_save_oem_strings_devices(dm);
462 case 38: /* IPMI Device Information */
463 dmi_save_ipmi_device(dm);
465 case 41: /* Onboard Devices Extended Information */
466 dmi_save_extended_devices(dm);
470 static int __init print_filtered(char *buf, size_t len, const char *info)
478 for (p = info; *p; p++)
480 c += scnprintf(buf + c, len - c, "%c", *p);
482 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
486 static void __init dmi_format_ids(char *buf, size_t len)
489 const char *board; /* Board Name is optional */
491 c += print_filtered(buf + c, len - c,
492 dmi_get_system_info(DMI_SYS_VENDOR));
493 c += scnprintf(buf + c, len - c, " ");
494 c += print_filtered(buf + c, len - c,
495 dmi_get_system_info(DMI_PRODUCT_NAME));
497 board = dmi_get_system_info(DMI_BOARD_NAME);
499 c += scnprintf(buf + c, len - c, "/");
500 c += print_filtered(buf + c, len - c, board);
502 c += scnprintf(buf + c, len - c, ", BIOS ");
503 c += print_filtered(buf + c, len - c,
504 dmi_get_system_info(DMI_BIOS_VERSION));
505 c += scnprintf(buf + c, len - c, " ");
506 c += print_filtered(buf + c, len - c,
507 dmi_get_system_info(DMI_BIOS_DATE));
511 * Check for DMI/SMBIOS headers in the system firmware image. Any
512 * SMBIOS header must start 16 bytes before the DMI header, so take a
513 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
514 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
515 * takes precedence) and return 0. Otherwise return 1.
517 static int __init dmi_present(const u8 *buf)
521 if (memcmp(buf, "_SM_", 4) == 0 &&
522 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
523 smbios_ver = get_unaligned_be16(buf + 6);
524 smbios_entry_point_size = buf[5];
525 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
527 /* Some BIOS report weird SMBIOS version, fix that up */
528 switch (smbios_ver) {
531 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
532 smbios_ver & 0xFF, 3);
536 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
546 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
548 dmi_ver = smbios_ver;
550 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
552 dmi_num = get_unaligned_le16(buf + 12);
553 dmi_len = get_unaligned_le16(buf + 6);
554 dmi_base = get_unaligned_le32(buf + 8);
556 if (dmi_walk_early(dmi_decode) == 0) {
558 pr_info("SMBIOS %d.%d present.\n",
559 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
561 smbios_entry_point_size = 15;
562 memcpy(smbios_entry_point, buf,
563 smbios_entry_point_size);
564 pr_info("Legacy DMI %d.%d present.\n",
565 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF);
567 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
568 pr_info("DMI: %s\n", dmi_ids_string);
577 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
578 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
580 static int __init dmi_smbios3_present(const u8 *buf)
582 if (memcmp(buf, "_SM3_", 5) == 0 &&
583 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
584 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
585 dmi_num = 0; /* No longer specified */
586 dmi_len = get_unaligned_le32(buf + 12);
587 dmi_base = get_unaligned_le64(buf + 16);
588 smbios_entry_point_size = buf[6];
589 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
591 if (dmi_walk_early(dmi_decode) == 0) {
592 pr_info("SMBIOS %d.%d.%d present.\n",
593 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
595 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
596 pr_info("DMI: %s\n", dmi_ids_string);
603 void __init dmi_scan_machine(void)
608 if (efi_enabled(EFI_CONFIG_TABLES)) {
610 * According to the DMTF SMBIOS reference spec v3.0.0, it is
611 * allowed to define both the 64-bit entry point (smbios3) and
612 * the 32-bit entry point (smbios), in which case they should
613 * either both point to the same SMBIOS structure table, or the
614 * table pointed to by the 64-bit entry point should contain a
615 * superset of the table contents pointed to by the 32-bit entry
616 * point (section 5.2)
617 * This implies that the 64-bit entry point should have
618 * precedence if it is defined and supported by the OS. If we
619 * have the 64-bit entry point, but fail to decode it, fall
620 * back to the legacy one (if available)
622 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
623 p = dmi_early_remap(efi.smbios3, 32);
626 memcpy_fromio(buf, p, 32);
627 dmi_early_unmap(p, 32);
629 if (!dmi_smbios3_present(buf)) {
634 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
637 /* This is called as a core_initcall() because it isn't
638 * needed during early boot. This also means we can
639 * iounmap the space when we're done with it.
641 p = dmi_early_remap(efi.smbios, 32);
644 memcpy_fromio(buf, p, 32);
645 dmi_early_unmap(p, 32);
647 if (!dmi_present(buf)) {
651 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
652 p = dmi_early_remap(0xF0000, 0x10000);
657 * Same logic as above, look for a 64-bit entry point
658 * first, and if not found, fall back to 32-bit entry point.
660 memcpy_fromio(buf, p, 16);
661 for (q = p + 16; q < p + 0x10000; q += 16) {
662 memcpy_fromio(buf + 16, q, 16);
663 if (!dmi_smbios3_present(buf)) {
665 dmi_early_unmap(p, 0x10000);
668 memcpy(buf, buf + 16, 16);
672 * Iterate over all possible DMI header addresses q.
673 * Maintain the 32 bytes around q in buf. On the
674 * first iteration, substitute zero for the
675 * out-of-range bytes so there is no chance of falsely
676 * detecting an SMBIOS header.
679 for (q = p; q < p + 0x10000; q += 16) {
680 memcpy_fromio(buf + 16, q, 16);
681 if (!dmi_present(buf)) {
683 dmi_early_unmap(p, 0x10000);
686 memcpy(buf, buf + 16, 16);
688 dmi_early_unmap(p, 0x10000);
691 pr_info("DMI not present or invalid.\n");
694 static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
695 struct bin_attribute *attr, char *buf,
696 loff_t pos, size_t count)
698 memcpy(buf, attr->private + pos, count);
702 static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
703 static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
705 static int __init dmi_init(void)
707 struct kobject *tables_kobj;
711 if (!dmi_available) {
717 * Set up dmi directory at /sys/firmware/dmi. This entry should stay
718 * even after farther error, as it can be used by other modules like
721 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
725 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
729 dmi_table = dmi_remap(dmi_base, dmi_len);
733 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
734 bin_attr_smbios_entry_point.private = smbios_entry_point;
735 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
739 bin_attr_DMI.size = dmi_len;
740 bin_attr_DMI.private = dmi_table;
741 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
745 sysfs_remove_bin_file(tables_kobj,
746 &bin_attr_smbios_entry_point);
748 dmi_unmap(dmi_table);
750 kobject_del(tables_kobj);
751 kobject_put(tables_kobj);
753 pr_err("dmi: Firmware registration failed.\n");
757 subsys_initcall(dmi_init);
760 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
762 * Invoke dump_stack_set_arch_desc() with DMI system information so that
763 * DMI identifiers are printed out on task dumps. Arch boot code should
764 * call this function after dmi_scan_machine() if it wants to print out DMI
765 * identifiers on task dumps.
767 void __init dmi_set_dump_stack_arch_desc(void)
769 dump_stack_set_arch_desc("%s", dmi_ids_string);
773 * dmi_matches - check if dmi_system_id structure matches system DMI data
774 * @dmi: pointer to the dmi_system_id structure to check
776 static bool dmi_matches(const struct dmi_system_id *dmi)
780 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
781 int s = dmi->matches[i].slot;
785 if (dmi->matches[i].exact_match) {
786 if (!strcmp(dmi_ident[s],
787 dmi->matches[i].substr))
790 if (strstr(dmi_ident[s],
791 dmi->matches[i].substr))
803 * dmi_is_end_of_table - check for end-of-table marker
804 * @dmi: pointer to the dmi_system_id structure to check
806 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
808 return dmi->matches[0].slot == DMI_NONE;
812 * dmi_check_system - check system DMI data
813 * @list: array of dmi_system_id structures to match against
814 * All non-null elements of the list must match
815 * their slot's (field index's) data (i.e., each
816 * list string must be a substring of the specified
817 * DMI slot's string data) to be considered a
820 * Walk the blacklist table running matching functions until someone
821 * returns non zero or we hit the end. Callback function is called for
822 * each successful match. Returns the number of matches.
824 * dmi_scan_machine must be called before this function is called.
826 int dmi_check_system(const struct dmi_system_id *list)
829 const struct dmi_system_id *d;
831 for (d = list; !dmi_is_end_of_table(d); d++)
832 if (dmi_matches(d)) {
834 if (d->callback && d->callback(d))
840 EXPORT_SYMBOL(dmi_check_system);
843 * dmi_first_match - find dmi_system_id structure matching system DMI data
844 * @list: array of dmi_system_id structures to match against
845 * All non-null elements of the list must match
846 * their slot's (field index's) data (i.e., each
847 * list string must be a substring of the specified
848 * DMI slot's string data) to be considered a
851 * Walk the blacklist table until the first match is found. Return the
852 * pointer to the matching entry or NULL if there's no match.
854 * dmi_scan_machine must be called before this function is called.
856 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
858 const struct dmi_system_id *d;
860 for (d = list; !dmi_is_end_of_table(d); d++)
866 EXPORT_SYMBOL(dmi_first_match);
869 * dmi_get_system_info - return DMI data value
870 * @field: data index (see enum dmi_field)
872 * Returns one DMI data value, can be used to perform
873 * complex DMI data checks.
875 const char *dmi_get_system_info(int field)
877 return dmi_ident[field];
879 EXPORT_SYMBOL(dmi_get_system_info);
882 * dmi_name_in_serial - Check if string is in the DMI product serial information
883 * @str: string to check for
885 int dmi_name_in_serial(const char *str)
887 int f = DMI_PRODUCT_SERIAL;
888 if (dmi_ident[f] && strstr(dmi_ident[f], str))
894 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
895 * @str: Case sensitive Name
897 int dmi_name_in_vendors(const char *str)
899 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
901 for (i = 0; fields[i] != DMI_NONE; i++) {
903 if (dmi_ident[f] && strstr(dmi_ident[f], str))
908 EXPORT_SYMBOL(dmi_name_in_vendors);
911 * dmi_find_device - find onboard device by type/name
912 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
913 * @name: device name string or %NULL to match all
914 * @from: previous device found in search, or %NULL for new search.
916 * Iterates through the list of known onboard devices. If a device is
917 * found with a matching @type and @name, a pointer to its device
918 * structure is returned. Otherwise, %NULL is returned.
919 * A new search is initiated by passing %NULL as the @from argument.
920 * If @from is not %NULL, searches continue from next device.
922 const struct dmi_device *dmi_find_device(int type, const char *name,
923 const struct dmi_device *from)
925 const struct list_head *head = from ? &from->list : &dmi_devices;
928 for (d = head->next; d != &dmi_devices; d = d->next) {
929 const struct dmi_device *dev =
930 list_entry(d, struct dmi_device, list);
932 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
933 ((name == NULL) || (strcmp(dev->name, name) == 0)))
939 EXPORT_SYMBOL(dmi_find_device);
942 * dmi_get_date - parse a DMI date
943 * @field: data index (see enum dmi_field)
944 * @yearp: optional out parameter for the year
945 * @monthp: optional out parameter for the month
946 * @dayp: optional out parameter for the day
948 * The date field is assumed to be in the form resembling
949 * [mm[/dd]]/yy[yy] and the result is stored in the out
950 * parameters any or all of which can be omitted.
952 * If the field doesn't exist, all out parameters are set to zero
953 * and false is returned. Otherwise, true is returned with any
954 * invalid part of date set to zero.
956 * On return, year, month and day are guaranteed to be in the
957 * range of [0,9999], [0,12] and [0,31] respectively.
959 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
961 int year = 0, month = 0, day = 0;
966 s = dmi_get_system_info(field);
972 * Determine year first. We assume the date string resembles
973 * mm/dd/yy[yy] but the original code extracted only the year
974 * from the end. Keep the behavior in the spirit of no
982 year = simple_strtoul(y, &e, 10);
983 if (y != e && year < 100) { /* 2-digit year */
985 if (year < 1996) /* no dates < spec 1.0 */
988 if (year > 9999) /* year should fit in %04d */
991 /* parse the mm and dd */
992 month = simple_strtoul(s, &e, 10);
993 if (s == e || *e != '/' || !month || month > 12) {
999 day = simple_strtoul(s, &e, 10);
1000 if (s == y || s == e || *e != '/' || day > 31)
1011 EXPORT_SYMBOL(dmi_get_date);
1014 * dmi_walk - Walk the DMI table and get called back for every record
1015 * @decode: Callback function
1016 * @private_data: Private data to be passed to the callback function
1018 * Returns 0 on success, -ENXIO if DMI is not selected or not present,
1019 * or a different negative error code if DMI walking fails.
1021 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
1029 buf = dmi_remap(dmi_base, dmi_len);
1033 dmi_decode_table(buf, decode, private_data);
1038 EXPORT_SYMBOL_GPL(dmi_walk);
1041 * dmi_match - compare a string to the dmi field (if exists)
1042 * @f: DMI field identifier
1043 * @str: string to compare the DMI field to
1045 * Returns true if the requested field equals to the str (including NULL).
1047 bool dmi_match(enum dmi_field f, const char *str)
1049 const char *info = dmi_get_system_info(f);
1051 if (info == NULL || str == NULL)
1054 return !strcmp(info, str);
1056 EXPORT_SYMBOL_GPL(dmi_match);
1058 void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1062 if (dmi_memdev == NULL)
1065 for (n = 0; n < dmi_memdev_nr; n++) {
1066 if (handle == dmi_memdev[n].handle) {
1067 *bank = dmi_memdev[n].bank;
1068 *device = dmi_memdev[n].device;
1073 EXPORT_SYMBOL_GPL(dmi_memdev_name);