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>
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
18 static const char dmi_empty_string
[] = " ";
20 static u16 __initdata dmi_ver
;
22 * Catch too early calls to dmi_check_system():
24 static int dmi_initialized
;
26 /* DMI system identification string used during boot */
27 static char dmi_ids_string
[128] __initdata
;
29 static struct dmi_memdev_info
{
34 static int dmi_memdev_nr
;
36 static const char * __init
dmi_string_nosave(const struct dmi_header
*dm
, u8 s
)
38 const u8
*bp
= ((u8
*) dm
) + dm
->length
;
42 while (s
> 0 && *bp
) {
48 size_t len
= strlen(bp
)+1;
49 size_t cmp_len
= len
> 8 ? 8 : len
;
51 if (!memcmp(bp
, dmi_empty_string
, cmp_len
))
52 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_table(u8
*buf
, int len
, int num
,
82 void (*decode
)(const struct dmi_header
*, void *),
89 * Stop when we see all the items the table claimed to have
90 * OR we run off the end of the table (also happens)
92 while ((i
< num
) && (data
- buf
+ sizeof(struct dmi_header
)) <= len
) {
93 const struct dmi_header
*dm
= (const struct dmi_header
*)data
;
96 * 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
98 if (dm
->type
== DMI_ENTRY_END_OF_TABLE
)
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
< len
- 1) && (data
[0] || data
[1]))
109 if (data
- buf
< len
- 1)
110 decode(dm
, private_data
);
116 static phys_addr_t dmi_base
;
120 static int __init
dmi_walk_early(void (*decode
)(const struct dmi_header
*,
125 buf
= dmi_early_remap(dmi_base
, dmi_len
);
129 dmi_table(buf
, dmi_len
, dmi_num
, decode
, NULL
);
131 add_device_randomness(buf
, dmi_len
);
133 dmi_early_unmap(buf
, dmi_len
);
137 static int __init
dmi_checksum(const u8
*buf
, u8 len
)
142 for (a
= 0; a
< len
; a
++)
148 static const char *dmi_ident
[DMI_STRING_MAX
];
149 static LIST_HEAD(dmi_devices
);
155 static void __init
dmi_save_ident(const struct dmi_header
*dm
, int slot
,
158 const char *d
= (const char *) dm
;
164 p
= dmi_string(dm
, d
[string
]);
171 static void __init
dmi_save_uuid(const struct dmi_header
*dm
, int slot
,
174 const u8
*d
= (u8
*) dm
+ index
;
176 int is_ff
= 1, is_00
= 1, i
;
181 for (i
= 0; i
< 16 && (is_ff
|| is_00
); i
++) {
191 s
= dmi_alloc(16*2+4+1);
196 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
197 * the UUID are supposed to be little-endian encoded. The specification
198 * says that this is the defacto standard.
200 if (dmi_ver
>= 0x0206)
201 sprintf(s
, "%pUL", d
);
203 sprintf(s
, "%pUB", d
);
208 static void __init
dmi_save_type(const struct dmi_header
*dm
, int slot
,
211 const u8
*d
= (u8
*) dm
+ index
;
221 sprintf(s
, "%u", *d
& 0x7F);
225 static void __init
dmi_save_one_device(int type
, const char *name
)
227 struct dmi_device
*dev
;
229 /* No duplicate device */
230 if (dmi_find_device(type
, name
, NULL
))
233 dev
= dmi_alloc(sizeof(*dev
) + strlen(name
) + 1);
238 strcpy((char *)(dev
+ 1), name
);
239 dev
->name
= (char *)(dev
+ 1);
240 dev
->device_data
= NULL
;
241 list_add(&dev
->list
, &dmi_devices
);
244 static void __init
dmi_save_devices(const struct dmi_header
*dm
)
246 int i
, count
= (dm
->length
- sizeof(struct dmi_header
)) / 2;
248 for (i
= 0; i
< count
; i
++) {
249 const char *d
= (char *)(dm
+ 1) + (i
* 2);
251 /* Skip disabled device */
252 if ((*d
& 0x80) == 0)
255 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
+ 1)));
259 static void __init
dmi_save_oem_strings_devices(const struct dmi_header
*dm
)
261 int i
, count
= *(u8
*)(dm
+ 1);
262 struct dmi_device
*dev
;
264 for (i
= 1; i
<= count
; i
++) {
265 const char *devname
= dmi_string(dm
, i
);
267 if (devname
== dmi_empty_string
)
270 dev
= dmi_alloc(sizeof(*dev
));
274 dev
->type
= DMI_DEV_TYPE_OEM_STRING
;
276 dev
->device_data
= NULL
;
278 list_add(&dev
->list
, &dmi_devices
);
282 static void __init
dmi_save_ipmi_device(const struct dmi_header
*dm
)
284 struct dmi_device
*dev
;
287 data
= dmi_alloc(dm
->length
);
291 memcpy(data
, dm
, dm
->length
);
293 dev
= dmi_alloc(sizeof(*dev
));
297 dev
->type
= DMI_DEV_TYPE_IPMI
;
298 dev
->name
= "IPMI controller";
299 dev
->device_data
= data
;
301 list_add_tail(&dev
->list
, &dmi_devices
);
304 static void __init
dmi_save_dev_onboard(int instance
, int segment
, int bus
,
305 int devfn
, const char *name
)
307 struct dmi_dev_onboard
*onboard_dev
;
309 onboard_dev
= dmi_alloc(sizeof(*onboard_dev
) + strlen(name
) + 1);
313 onboard_dev
->instance
= instance
;
314 onboard_dev
->segment
= segment
;
315 onboard_dev
->bus
= bus
;
316 onboard_dev
->devfn
= devfn
;
318 strcpy((char *)&onboard_dev
[1], name
);
319 onboard_dev
->dev
.type
= DMI_DEV_TYPE_DEV_ONBOARD
;
320 onboard_dev
->dev
.name
= (char *)&onboard_dev
[1];
321 onboard_dev
->dev
.device_data
= onboard_dev
;
323 list_add(&onboard_dev
->dev
.list
, &dmi_devices
);
326 static void __init
dmi_save_extended_devices(const struct dmi_header
*dm
)
328 const u8
*d
= (u8
*) dm
+ 5;
330 /* Skip disabled device */
331 if ((*d
& 0x80) == 0)
334 dmi_save_dev_onboard(*(d
+1), *(u16
*)(d
+2), *(d
+4), *(d
+5),
335 dmi_string_nosave(dm
, *(d
-1)));
336 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
- 1)));
339 static void __init
count_mem_devices(const struct dmi_header
*dm
, void *v
)
341 if (dm
->type
!= DMI_ENTRY_MEM_DEVICE
)
346 static void __init
save_mem_devices(const struct dmi_header
*dm
, void *v
)
348 const char *d
= (const char *)dm
;
351 if (dm
->type
!= DMI_ENTRY_MEM_DEVICE
)
353 if (nr
>= dmi_memdev_nr
) {
354 pr_warn(FW_BUG
"Too many DIMM entries in SMBIOS table\n");
357 dmi_memdev
[nr
].handle
= get_unaligned(&dm
->handle
);
358 dmi_memdev
[nr
].device
= dmi_string(dm
, d
[0x10]);
359 dmi_memdev
[nr
].bank
= dmi_string(dm
, d
[0x11]);
363 void __init
dmi_memdev_walk(void)
368 if (dmi_walk_early(count_mem_devices
) == 0 && dmi_memdev_nr
) {
369 dmi_memdev
= dmi_alloc(sizeof(*dmi_memdev
) * dmi_memdev_nr
);
371 dmi_walk_early(save_mem_devices
);
376 * Process a DMI table entry. Right now all we care about are the BIOS
377 * and machine entries. For 2.5 we should pull the smbus controller info
380 static void __init
dmi_decode(const struct dmi_header
*dm
, void *dummy
)
383 case 0: /* BIOS Information */
384 dmi_save_ident(dm
, DMI_BIOS_VENDOR
, 4);
385 dmi_save_ident(dm
, DMI_BIOS_VERSION
, 5);
386 dmi_save_ident(dm
, DMI_BIOS_DATE
, 8);
388 case 1: /* System Information */
389 dmi_save_ident(dm
, DMI_SYS_VENDOR
, 4);
390 dmi_save_ident(dm
, DMI_PRODUCT_NAME
, 5);
391 dmi_save_ident(dm
, DMI_PRODUCT_VERSION
, 6);
392 dmi_save_ident(dm
, DMI_PRODUCT_SERIAL
, 7);
393 dmi_save_uuid(dm
, DMI_PRODUCT_UUID
, 8);
395 case 2: /* Base Board Information */
396 dmi_save_ident(dm
, DMI_BOARD_VENDOR
, 4);
397 dmi_save_ident(dm
, DMI_BOARD_NAME
, 5);
398 dmi_save_ident(dm
, DMI_BOARD_VERSION
, 6);
399 dmi_save_ident(dm
, DMI_BOARD_SERIAL
, 7);
400 dmi_save_ident(dm
, DMI_BOARD_ASSET_TAG
, 8);
402 case 3: /* Chassis Information */
403 dmi_save_ident(dm
, DMI_CHASSIS_VENDOR
, 4);
404 dmi_save_type(dm
, DMI_CHASSIS_TYPE
, 5);
405 dmi_save_ident(dm
, DMI_CHASSIS_VERSION
, 6);
406 dmi_save_ident(dm
, DMI_CHASSIS_SERIAL
, 7);
407 dmi_save_ident(dm
, DMI_CHASSIS_ASSET_TAG
, 8);
409 case 10: /* Onboard Devices Information */
410 dmi_save_devices(dm
);
412 case 11: /* OEM Strings */
413 dmi_save_oem_strings_devices(dm
);
415 case 38: /* IPMI Device Information */
416 dmi_save_ipmi_device(dm
);
418 case 41: /* Onboard Devices Extended Information */
419 dmi_save_extended_devices(dm
);
423 static int __init
print_filtered(char *buf
, size_t len
, const char *info
)
431 for (p
= info
; *p
; p
++)
433 c
+= scnprintf(buf
+ c
, len
- c
, "%c", *p
);
435 c
+= scnprintf(buf
+ c
, len
- c
, "\\x%02x", *p
& 0xff);
439 static void __init
dmi_format_ids(char *buf
, size_t len
)
442 const char *board
; /* Board Name is optional */
444 c
+= print_filtered(buf
+ c
, len
- c
,
445 dmi_get_system_info(DMI_SYS_VENDOR
));
446 c
+= scnprintf(buf
+ c
, len
- c
, " ");
447 c
+= print_filtered(buf
+ c
, len
- c
,
448 dmi_get_system_info(DMI_PRODUCT_NAME
));
450 board
= dmi_get_system_info(DMI_BOARD_NAME
);
452 c
+= scnprintf(buf
+ c
, len
- c
, "/");
453 c
+= print_filtered(buf
+ c
, len
- c
, board
);
455 c
+= scnprintf(buf
+ c
, len
- c
, ", BIOS ");
456 c
+= print_filtered(buf
+ c
, len
- c
,
457 dmi_get_system_info(DMI_BIOS_VERSION
));
458 c
+= scnprintf(buf
+ c
, len
- c
, " ");
459 c
+= print_filtered(buf
+ c
, len
- c
,
460 dmi_get_system_info(DMI_BIOS_DATE
));
464 * Check for DMI/SMBIOS headers in the system firmware image. Any
465 * SMBIOS header must start 16 bytes before the DMI header, so take a
466 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
467 * 0. If the DMI header is present, set dmi_ver accordingly (SMBIOS
468 * takes precedence) and return 0. Otherwise return 1.
470 static int __init
dmi_present(const u8
*buf
)
474 if (memcmp(buf
, "_SM_", 4) == 0 &&
475 buf
[5] < 32 && dmi_checksum(buf
, buf
[5])) {
476 smbios_ver
= get_unaligned_be16(buf
+ 6);
478 /* Some BIOS report weird SMBIOS version, fix that up */
479 switch (smbios_ver
) {
482 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n",
483 smbios_ver
& 0xFF, 3);
487 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6);
497 if (memcmp(buf
, "_DMI_", 5) == 0 && dmi_checksum(buf
, 15)) {
498 dmi_num
= get_unaligned_le16(buf
+ 12);
499 dmi_len
= get_unaligned_le16(buf
+ 6);
500 dmi_base
= get_unaligned_le32(buf
+ 8);
502 if (dmi_walk_early(dmi_decode
) == 0) {
504 dmi_ver
= smbios_ver
;
505 pr_info("SMBIOS %d.%d present.\n",
506 dmi_ver
>> 8, dmi_ver
& 0xFF);
508 dmi_ver
= (buf
[14] & 0xF0) << 4 |
510 pr_info("Legacy DMI %d.%d present.\n",
511 dmi_ver
>> 8, dmi_ver
& 0xFF);
513 dmi_format_ids(dmi_ids_string
, sizeof(dmi_ids_string
));
514 printk(KERN_DEBUG
"DMI: %s\n", dmi_ids_string
);
523 * Check for the SMBIOS 3.0 64-bit entry point signature. Unlike the legacy
524 * 32-bit entry point, there is no embedded DMI header (_DMI_) in here.
526 static int __init
dmi_smbios3_present(const u8
*buf
)
528 if (memcmp(buf
, "_SM3_", 5) == 0 &&
529 buf
[6] < 32 && dmi_checksum(buf
, buf
[6])) {
530 dmi_ver
= get_unaligned_be16(buf
+ 7);
531 dmi_len
= get_unaligned_le32(buf
+ 12);
532 dmi_base
= get_unaligned_le64(buf
+ 16);
535 * The 64-bit SMBIOS 3.0 entry point no longer has a field
536 * containing the number of structures present in the table.
537 * Instead, it defines the table size as a maximum size, and
538 * relies on the end-of-table structure type (#127) to be used
539 * to signal the end of the table.
540 * So let's define dmi_num as an upper bound as well: each
541 * structure has a 4 byte header, so dmi_len / 4 is an upper
542 * bound for the number of structures in the table.
544 dmi_num
= dmi_len
/ 4;
546 if (dmi_walk_early(dmi_decode
) == 0) {
547 pr_info("SMBIOS %d.%d present.\n",
548 dmi_ver
>> 8, dmi_ver
& 0xFF);
549 dmi_format_ids(dmi_ids_string
, sizeof(dmi_ids_string
));
550 pr_debug("DMI: %s\n", dmi_ids_string
);
557 void __init
dmi_scan_machine(void)
562 if (efi_enabled(EFI_CONFIG_TABLES
)) {
564 * According to the DMTF SMBIOS reference spec v3.0.0, it is
565 * allowed to define both the 64-bit entry point (smbios3) and
566 * the 32-bit entry point (smbios), in which case they should
567 * either both point to the same SMBIOS structure table, or the
568 * table pointed to by the 64-bit entry point should contain a
569 * superset of the table contents pointed to by the 32-bit entry
570 * point (section 5.2)
571 * This implies that the 64-bit entry point should have
572 * precedence if it is defined and supported by the OS. If we
573 * have the 64-bit entry point, but fail to decode it, fall
574 * back to the legacy one (if available)
576 if (efi
.smbios3
!= EFI_INVALID_TABLE_ADDR
) {
577 p
= dmi_early_remap(efi
.smbios3
, 32);
580 memcpy_fromio(buf
, p
, 32);
581 dmi_early_unmap(p
, 32);
583 if (!dmi_smbios3_present(buf
)) {
588 if (efi
.smbios
== EFI_INVALID_TABLE_ADDR
)
591 /* This is called as a core_initcall() because it isn't
592 * needed during early boot. This also means we can
593 * iounmap the space when we're done with it.
595 p
= dmi_early_remap(efi
.smbios
, 32);
598 memcpy_fromio(buf
, p
, 32);
599 dmi_early_unmap(p
, 32);
601 if (!dmi_present(buf
)) {
605 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK
)) {
606 p
= dmi_early_remap(0xF0000, 0x10000);
611 * Iterate over all possible DMI header addresses q.
612 * Maintain the 32 bytes around q in buf. On the
613 * first iteration, substitute zero for the
614 * out-of-range bytes so there is no chance of falsely
615 * detecting an SMBIOS header.
618 for (q
= p
; q
< p
+ 0x10000; q
+= 16) {
619 memcpy_fromio(buf
+ 16, q
, 16);
620 if (!dmi_smbios3_present(buf
) || !dmi_present(buf
)) {
622 dmi_early_unmap(p
, 0x10000);
625 memcpy(buf
, buf
+ 16, 16);
627 dmi_early_unmap(p
, 0x10000);
630 pr_info("DMI not present or invalid.\n");
636 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
638 * Invoke dump_stack_set_arch_desc() with DMI system information so that
639 * DMI identifiers are printed out on task dumps. Arch boot code should
640 * call this function after dmi_scan_machine() if it wants to print out DMI
641 * identifiers on task dumps.
643 void __init
dmi_set_dump_stack_arch_desc(void)
645 dump_stack_set_arch_desc("%s", dmi_ids_string
);
649 * dmi_matches - check if dmi_system_id structure matches system DMI data
650 * @dmi: pointer to the dmi_system_id structure to check
652 static bool dmi_matches(const struct dmi_system_id
*dmi
)
656 WARN(!dmi_initialized
, KERN_ERR
"dmi check: not initialized yet.\n");
658 for (i
= 0; i
< ARRAY_SIZE(dmi
->matches
); i
++) {
659 int s
= dmi
->matches
[i
].slot
;
663 if (!dmi
->matches
[i
].exact_match
&&
664 strstr(dmi_ident
[s
], dmi
->matches
[i
].substr
))
666 else if (dmi
->matches
[i
].exact_match
&&
667 !strcmp(dmi_ident
[s
], dmi
->matches
[i
].substr
))
678 * dmi_is_end_of_table - check for end-of-table marker
679 * @dmi: pointer to the dmi_system_id structure to check
681 static bool dmi_is_end_of_table(const struct dmi_system_id
*dmi
)
683 return dmi
->matches
[0].slot
== DMI_NONE
;
687 * dmi_check_system - check system DMI data
688 * @list: array of dmi_system_id structures to match against
689 * All non-null elements of the list must match
690 * their slot's (field index's) data (i.e., each
691 * list string must be a substring of the specified
692 * DMI slot's string data) to be considered a
695 * Walk the blacklist table running matching functions until someone
696 * returns non zero or we hit the end. Callback function is called for
697 * each successful match. Returns the number of matches.
699 int dmi_check_system(const struct dmi_system_id
*list
)
702 const struct dmi_system_id
*d
;
704 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
705 if (dmi_matches(d
)) {
707 if (d
->callback
&& d
->callback(d
))
713 EXPORT_SYMBOL(dmi_check_system
);
716 * dmi_first_match - find dmi_system_id structure matching system DMI data
717 * @list: array of dmi_system_id structures to match against
718 * All non-null elements of the list must match
719 * their slot's (field index's) data (i.e., each
720 * list string must be a substring of the specified
721 * DMI slot's string data) to be considered a
724 * Walk the blacklist table until the first match is found. Return the
725 * pointer to the matching entry or NULL if there's no match.
727 const struct dmi_system_id
*dmi_first_match(const struct dmi_system_id
*list
)
729 const struct dmi_system_id
*d
;
731 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
737 EXPORT_SYMBOL(dmi_first_match
);
740 * dmi_get_system_info - return DMI data value
741 * @field: data index (see enum dmi_field)
743 * Returns one DMI data value, can be used to perform
744 * complex DMI data checks.
746 const char *dmi_get_system_info(int field
)
748 return dmi_ident
[field
];
750 EXPORT_SYMBOL(dmi_get_system_info
);
753 * dmi_name_in_serial - Check if string is in the DMI product serial information
754 * @str: string to check for
756 int dmi_name_in_serial(const char *str
)
758 int f
= DMI_PRODUCT_SERIAL
;
759 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
765 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
766 * @str: Case sensitive Name
768 int dmi_name_in_vendors(const char *str
)
770 static int fields
[] = { DMI_SYS_VENDOR
, DMI_BOARD_VENDOR
, DMI_NONE
};
772 for (i
= 0; fields
[i
] != DMI_NONE
; i
++) {
774 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
779 EXPORT_SYMBOL(dmi_name_in_vendors
);
782 * dmi_find_device - find onboard device by type/name
783 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
784 * @name: device name string or %NULL to match all
785 * @from: previous device found in search, or %NULL for new search.
787 * Iterates through the list of known onboard devices. If a device is
788 * found with a matching @vendor and @device, a pointer to its device
789 * structure is returned. Otherwise, %NULL is returned.
790 * A new search is initiated by passing %NULL as the @from argument.
791 * If @from is not %NULL, searches continue from next device.
793 const struct dmi_device
*dmi_find_device(int type
, const char *name
,
794 const struct dmi_device
*from
)
796 const struct list_head
*head
= from
? &from
->list
: &dmi_devices
;
799 for (d
= head
->next
; d
!= &dmi_devices
; d
= d
->next
) {
800 const struct dmi_device
*dev
=
801 list_entry(d
, struct dmi_device
, list
);
803 if (((type
== DMI_DEV_TYPE_ANY
) || (dev
->type
== type
)) &&
804 ((name
== NULL
) || (strcmp(dev
->name
, name
) == 0)))
810 EXPORT_SYMBOL(dmi_find_device
);
813 * dmi_get_date - parse a DMI date
814 * @field: data index (see enum dmi_field)
815 * @yearp: optional out parameter for the year
816 * @monthp: optional out parameter for the month
817 * @dayp: optional out parameter for the day
819 * The date field is assumed to be in the form resembling
820 * [mm[/dd]]/yy[yy] and the result is stored in the out
821 * parameters any or all of which can be omitted.
823 * If the field doesn't exist, all out parameters are set to zero
824 * and false is returned. Otherwise, true is returned with any
825 * invalid part of date set to zero.
827 * On return, year, month and day are guaranteed to be in the
828 * range of [0,9999], [0,12] and [0,31] respectively.
830 bool dmi_get_date(int field
, int *yearp
, int *monthp
, int *dayp
)
832 int year
= 0, month
= 0, day
= 0;
837 s
= dmi_get_system_info(field
);
843 * Determine year first. We assume the date string resembles
844 * mm/dd/yy[yy] but the original code extracted only the year
845 * from the end. Keep the behavior in the spirit of no
853 year
= simple_strtoul(y
, &e
, 10);
854 if (y
!= e
&& year
< 100) { /* 2-digit year */
856 if (year
< 1996) /* no dates < spec 1.0 */
859 if (year
> 9999) /* year should fit in %04d */
862 /* parse the mm and dd */
863 month
= simple_strtoul(s
, &e
, 10);
864 if (s
== e
|| *e
!= '/' || !month
|| month
> 12) {
870 day
= simple_strtoul(s
, &e
, 10);
871 if (s
== y
|| s
== e
|| *e
!= '/' || day
> 31)
882 EXPORT_SYMBOL(dmi_get_date
);
885 * dmi_walk - Walk the DMI table and get called back for every record
886 * @decode: Callback function
887 * @private_data: Private data to be passed to the callback function
889 * Returns -1 when the DMI table can't be reached, 0 on success.
891 int dmi_walk(void (*decode
)(const struct dmi_header
*, void *),
899 buf
= dmi_remap(dmi_base
, dmi_len
);
903 dmi_table(buf
, dmi_len
, dmi_num
, decode
, private_data
);
908 EXPORT_SYMBOL_GPL(dmi_walk
);
911 * dmi_match - compare a string to the dmi field (if exists)
912 * @f: DMI field identifier
913 * @str: string to compare the DMI field to
915 * Returns true if the requested field equals to the str (including NULL).
917 bool dmi_match(enum dmi_field f
, const char *str
)
919 const char *info
= dmi_get_system_info(f
);
921 if (info
== NULL
|| str
== NULL
)
924 return !strcmp(info
, str
);
926 EXPORT_SYMBOL_GPL(dmi_match
);
928 void dmi_memdev_name(u16 handle
, const char **bank
, const char **device
)
932 if (dmi_memdev
== NULL
)
935 for (n
= 0; n
< dmi_memdev_nr
; n
++) {
936 if (handle
== dmi_memdev
[n
].handle
) {
937 *bank
= dmi_memdev
[n
].bank
;
938 *device
= dmi_memdev
[n
].device
;
943 EXPORT_SYMBOL_GPL(dmi_memdev_name
);