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>
13 * DMI stands for "Desktop Management Interface". It is part
14 * of and an antecedent to, SMBIOS, which stands for System
15 * Management BIOS. See further: http://www.dmtf.org/standards
17 static char dmi_empty_string
[] = " ";
20 * Catch too early calls to dmi_check_system():
22 static int dmi_initialized
;
24 static const char * __init
dmi_string_nosave(const struct dmi_header
*dm
, u8 s
)
26 const u8
*bp
= ((u8
*) dm
) + dm
->length
;
30 while (s
> 0 && *bp
) {
36 size_t len
= strlen(bp
)+1;
37 size_t cmp_len
= len
> 8 ? 8 : len
;
39 if (!memcmp(bp
, dmi_empty_string
, cmp_len
))
40 return dmi_empty_string
;
48 static char * __init
dmi_string(const struct dmi_header
*dm
, u8 s
)
50 const char *bp
= dmi_string_nosave(dm
, s
);
54 if (bp
== dmi_empty_string
)
55 return dmi_empty_string
;
62 printk(KERN_ERR
"dmi_string: cannot allocate %Zu bytes.\n", len
);
68 * We have to be cautious here. We have seen BIOSes with DMI pointers
69 * pointing to completely the wrong place for example
71 static void dmi_table(u8
*buf
, int len
, int num
,
72 void (*decode
)(const struct dmi_header
*, void *),
79 * Stop when we see all the items the table claimed to have
80 * OR we run off the end of the table (also happens)
82 while ((i
< num
) && (data
- buf
+ sizeof(struct dmi_header
)) <= len
) {
83 const struct dmi_header
*dm
= (const struct dmi_header
*)data
;
86 * We want to know the total length (formatted area and
87 * strings) before decoding to make sure we won't run off the
88 * table in dmi_decode or dmi_string
91 while ((data
- buf
< len
- 1) && (data
[0] || data
[1]))
93 if (data
- buf
< len
- 1)
94 decode(dm
, private_data
);
104 static int __init
dmi_walk_early(void (*decode
)(const struct dmi_header
*,
109 buf
= dmi_ioremap(dmi_base
, dmi_len
);
113 dmi_table(buf
, dmi_len
, dmi_num
, decode
, NULL
);
115 add_device_randomness(buf
, dmi_len
);
117 dmi_iounmap(buf
, dmi_len
);
121 static int __init
dmi_checksum(const u8
*buf
)
126 for (a
= 0; a
< 15; a
++)
132 static char *dmi_ident
[DMI_STRING_MAX
];
133 static LIST_HEAD(dmi_devices
);
139 static void __init
dmi_save_ident(const struct dmi_header
*dm
, int slot
, int string
)
141 const char *d
= (const char*) dm
;
147 p
= dmi_string(dm
, d
[string
]);
154 static void __init
dmi_save_uuid(const struct dmi_header
*dm
, int slot
, int index
)
156 const u8
*d
= (u8
*) dm
+ index
;
158 int is_ff
= 1, is_00
= 1, i
;
163 for (i
= 0; i
< 16 && (is_ff
|| is_00
); i
++) {
164 if(d
[i
] != 0x00) is_ff
= 0;
165 if(d
[i
] != 0xFF) is_00
= 0;
171 s
= dmi_alloc(16*2+4+1);
175 sprintf(s
, "%pUB", d
);
180 static void __init
dmi_save_type(const struct dmi_header
*dm
, int slot
, int index
)
182 const u8
*d
= (u8
*) dm
+ index
;
192 sprintf(s
, "%u", *d
& 0x7F);
196 static void __init
dmi_save_one_device(int type
, const char *name
)
198 struct dmi_device
*dev
;
200 /* No duplicate device */
201 if (dmi_find_device(type
, name
, NULL
))
204 dev
= dmi_alloc(sizeof(*dev
) + strlen(name
) + 1);
206 printk(KERN_ERR
"dmi_save_one_device: out of memory.\n");
211 strcpy((char *)(dev
+ 1), name
);
212 dev
->name
= (char *)(dev
+ 1);
213 dev
->device_data
= NULL
;
214 list_add(&dev
->list
, &dmi_devices
);
217 static void __init
dmi_save_devices(const struct dmi_header
*dm
)
219 int i
, count
= (dm
->length
- sizeof(struct dmi_header
)) / 2;
221 for (i
= 0; i
< count
; i
++) {
222 const char *d
= (char *)(dm
+ 1) + (i
* 2);
224 /* Skip disabled device */
225 if ((*d
& 0x80) == 0)
228 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
+ 1)));
232 static void __init
dmi_save_oem_strings_devices(const struct dmi_header
*dm
)
234 int i
, count
= *(u8
*)(dm
+ 1);
235 struct dmi_device
*dev
;
237 for (i
= 1; i
<= count
; i
++) {
238 char *devname
= dmi_string(dm
, i
);
240 if (devname
== dmi_empty_string
)
243 dev
= dmi_alloc(sizeof(*dev
));
246 "dmi_save_oem_strings_devices: out of memory.\n");
250 dev
->type
= DMI_DEV_TYPE_OEM_STRING
;
252 dev
->device_data
= NULL
;
254 list_add(&dev
->list
, &dmi_devices
);
258 static void __init
dmi_save_ipmi_device(const struct dmi_header
*dm
)
260 struct dmi_device
*dev
;
263 data
= dmi_alloc(dm
->length
);
265 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
269 memcpy(data
, dm
, dm
->length
);
271 dev
= dmi_alloc(sizeof(*dev
));
273 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
277 dev
->type
= DMI_DEV_TYPE_IPMI
;
278 dev
->name
= "IPMI controller";
279 dev
->device_data
= data
;
281 list_add_tail(&dev
->list
, &dmi_devices
);
284 static void __init
dmi_save_dev_onboard(int instance
, int segment
, int bus
,
285 int devfn
, const char *name
)
287 struct dmi_dev_onboard
*onboard_dev
;
289 onboard_dev
= dmi_alloc(sizeof(*onboard_dev
) + strlen(name
) + 1);
291 printk(KERN_ERR
"dmi_save_dev_onboard: out of memory.\n");
294 onboard_dev
->instance
= instance
;
295 onboard_dev
->segment
= segment
;
296 onboard_dev
->bus
= bus
;
297 onboard_dev
->devfn
= devfn
;
299 strcpy((char *)&onboard_dev
[1], name
);
300 onboard_dev
->dev
.type
= DMI_DEV_TYPE_DEV_ONBOARD
;
301 onboard_dev
->dev
.name
= (char *)&onboard_dev
[1];
302 onboard_dev
->dev
.device_data
= onboard_dev
;
304 list_add(&onboard_dev
->dev
.list
, &dmi_devices
);
307 static void __init
dmi_save_extended_devices(const struct dmi_header
*dm
)
309 const u8
*d
= (u8
*) dm
+ 5;
311 /* Skip disabled device */
312 if ((*d
& 0x80) == 0)
315 dmi_save_dev_onboard(*(d
+1), *(u16
*)(d
+2), *(d
+4), *(d
+5),
316 dmi_string_nosave(dm
, *(d
-1)));
317 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
- 1)));
321 * Process a DMI table entry. Right now all we care about are the BIOS
322 * and machine entries. For 2.5 we should pull the smbus controller info
325 static void __init
dmi_decode(const struct dmi_header
*dm
, void *dummy
)
328 case 0: /* BIOS Information */
329 dmi_save_ident(dm
, DMI_BIOS_VENDOR
, 4);
330 dmi_save_ident(dm
, DMI_BIOS_VERSION
, 5);
331 dmi_save_ident(dm
, DMI_BIOS_DATE
, 8);
333 case 1: /* System Information */
334 dmi_save_ident(dm
, DMI_SYS_VENDOR
, 4);
335 dmi_save_ident(dm
, DMI_PRODUCT_NAME
, 5);
336 dmi_save_ident(dm
, DMI_PRODUCT_VERSION
, 6);
337 dmi_save_ident(dm
, DMI_PRODUCT_SERIAL
, 7);
338 dmi_save_uuid(dm
, DMI_PRODUCT_UUID
, 8);
340 case 2: /* Base Board Information */
341 dmi_save_ident(dm
, DMI_BOARD_VENDOR
, 4);
342 dmi_save_ident(dm
, DMI_BOARD_NAME
, 5);
343 dmi_save_ident(dm
, DMI_BOARD_VERSION
, 6);
344 dmi_save_ident(dm
, DMI_BOARD_SERIAL
, 7);
345 dmi_save_ident(dm
, DMI_BOARD_ASSET_TAG
, 8);
347 case 3: /* Chassis Information */
348 dmi_save_ident(dm
, DMI_CHASSIS_VENDOR
, 4);
349 dmi_save_type(dm
, DMI_CHASSIS_TYPE
, 5);
350 dmi_save_ident(dm
, DMI_CHASSIS_VERSION
, 6);
351 dmi_save_ident(dm
, DMI_CHASSIS_SERIAL
, 7);
352 dmi_save_ident(dm
, DMI_CHASSIS_ASSET_TAG
, 8);
354 case 10: /* Onboard Devices Information */
355 dmi_save_devices(dm
);
357 case 11: /* OEM Strings */
358 dmi_save_oem_strings_devices(dm
);
360 case 38: /* IPMI Device Information */
361 dmi_save_ipmi_device(dm
);
363 case 41: /* Onboard Devices Extended Information */
364 dmi_save_extended_devices(dm
);
368 static void __init
print_filtered(const char *info
)
375 for (p
= info
; *p
; p
++)
377 printk(KERN_CONT
"%c", *p
);
379 printk(KERN_CONT
"\\x%02x", *p
& 0xff);
382 static void __init
dmi_dump_ids(void)
384 const char *board
; /* Board Name is optional */
386 printk(KERN_DEBUG
"DMI: ");
387 print_filtered(dmi_get_system_info(DMI_SYS_VENDOR
));
388 printk(KERN_CONT
" ");
389 print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME
));
390 board
= dmi_get_system_info(DMI_BOARD_NAME
);
392 printk(KERN_CONT
"/");
393 print_filtered(board
);
395 printk(KERN_CONT
", BIOS ");
396 print_filtered(dmi_get_system_info(DMI_BIOS_VERSION
));
397 printk(KERN_CONT
" ");
398 print_filtered(dmi_get_system_info(DMI_BIOS_DATE
));
399 printk(KERN_CONT
"\n");
402 static int __init
dmi_present(const char __iomem
*p
)
406 memcpy_fromio(buf
, p
, 15);
407 if ((memcmp(buf
, "_DMI_", 5) == 0) && dmi_checksum(buf
)) {
408 dmi_num
= (buf
[13] << 8) | buf
[12];
409 dmi_len
= (buf
[7] << 8) | buf
[6];
410 dmi_base
= (buf
[11] << 24) | (buf
[10] << 16) |
411 (buf
[9] << 8) | buf
[8];
414 * DMI version 0.0 means that the real version is taken from
415 * the SMBIOS version, which we don't know at this point.
418 printk(KERN_INFO
"DMI %d.%d present.\n",
419 buf
[14] >> 4, buf
[14] & 0xF);
421 printk(KERN_INFO
"DMI present.\n");
422 if (dmi_walk_early(dmi_decode
) == 0) {
430 void __init
dmi_scan_machine(void)
436 if (efi
.smbios
== EFI_INVALID_TABLE_ADDR
)
439 /* This is called as a core_initcall() because it isn't
440 * needed during early boot. This also means we can
441 * iounmap the space when we're done with it.
443 p
= dmi_ioremap(efi
.smbios
, 32);
447 rc
= dmi_present(p
+ 0x10); /* offset of _DMI_ string */
456 * no iounmap() for that ioremap(); it would be a no-op, but
457 * it's so early in setup that sucker gets confused into doing
458 * what it shouldn't if we actually call it.
460 p
= dmi_ioremap(0xF0000, 0x10000);
464 for (q
= p
; q
< p
+ 0x10000; q
+= 16) {
468 dmi_iounmap(p
, 0x10000);
472 dmi_iounmap(p
, 0x10000);
475 printk(KERN_INFO
"DMI not present or invalid.\n");
481 * dmi_matches - check if dmi_system_id structure matches system DMI data
482 * @dmi: pointer to the dmi_system_id structure to check
484 static bool dmi_matches(const struct dmi_system_id
*dmi
)
488 WARN(!dmi_initialized
, KERN_ERR
"dmi check: not initialized yet.\n");
490 for (i
= 0; i
< ARRAY_SIZE(dmi
->matches
); i
++) {
491 int s
= dmi
->matches
[i
].slot
;
495 && strstr(dmi_ident
[s
], dmi
->matches
[i
].substr
))
504 * dmi_is_end_of_table - check for end-of-table marker
505 * @dmi: pointer to the dmi_system_id structure to check
507 static bool dmi_is_end_of_table(const struct dmi_system_id
*dmi
)
509 return dmi
->matches
[0].slot
== DMI_NONE
;
513 * dmi_check_system - check system DMI data
514 * @list: array of dmi_system_id structures to match against
515 * All non-null elements of the list must match
516 * their slot's (field index's) data (i.e., each
517 * list string must be a substring of the specified
518 * DMI slot's string data) to be considered a
521 * Walk the blacklist table running matching functions until someone
522 * returns non zero or we hit the end. Callback function is called for
523 * each successful match. Returns the number of matches.
525 int dmi_check_system(const struct dmi_system_id
*list
)
528 const struct dmi_system_id
*d
;
530 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
531 if (dmi_matches(d
)) {
533 if (d
->callback
&& d
->callback(d
))
539 EXPORT_SYMBOL(dmi_check_system
);
542 * dmi_first_match - find dmi_system_id structure matching system DMI data
543 * @list: array of dmi_system_id structures to match against
544 * All non-null elements of the list must match
545 * their slot's (field index's) data (i.e., each
546 * list string must be a substring of the specified
547 * DMI slot's string data) to be considered a
550 * Walk the blacklist table until the first match is found. Return the
551 * pointer to the matching entry or NULL if there's no match.
553 const struct dmi_system_id
*dmi_first_match(const struct dmi_system_id
*list
)
555 const struct dmi_system_id
*d
;
557 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
563 EXPORT_SYMBOL(dmi_first_match
);
566 * dmi_get_system_info - return DMI data value
567 * @field: data index (see enum dmi_field)
569 * Returns one DMI data value, can be used to perform
570 * complex DMI data checks.
572 const char *dmi_get_system_info(int field
)
574 return dmi_ident
[field
];
576 EXPORT_SYMBOL(dmi_get_system_info
);
579 * dmi_name_in_serial - Check if string is in the DMI product serial information
580 * @str: string to check for
582 int dmi_name_in_serial(const char *str
)
584 int f
= DMI_PRODUCT_SERIAL
;
585 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
591 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
592 * @str: Case sensitive Name
594 int dmi_name_in_vendors(const char *str
)
596 static int fields
[] = { DMI_SYS_VENDOR
, DMI_BOARD_VENDOR
, DMI_NONE
};
598 for (i
= 0; fields
[i
] != DMI_NONE
; i
++) {
600 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
605 EXPORT_SYMBOL(dmi_name_in_vendors
);
608 * dmi_find_device - find onboard device by type/name
609 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
610 * @name: device name string or %NULL to match all
611 * @from: previous device found in search, or %NULL for new search.
613 * Iterates through the list of known onboard devices. If a device is
614 * found with a matching @vendor and @device, a pointer to its device
615 * structure is returned. Otherwise, %NULL is returned.
616 * A new search is initiated by passing %NULL as the @from argument.
617 * If @from is not %NULL, searches continue from next device.
619 const struct dmi_device
* dmi_find_device(int type
, const char *name
,
620 const struct dmi_device
*from
)
622 const struct list_head
*head
= from
? &from
->list
: &dmi_devices
;
625 for(d
= head
->next
; d
!= &dmi_devices
; d
= d
->next
) {
626 const struct dmi_device
*dev
=
627 list_entry(d
, struct dmi_device
, list
);
629 if (((type
== DMI_DEV_TYPE_ANY
) || (dev
->type
== type
)) &&
630 ((name
== NULL
) || (strcmp(dev
->name
, name
) == 0)))
636 EXPORT_SYMBOL(dmi_find_device
);
639 * dmi_get_date - parse a DMI date
640 * @field: data index (see enum dmi_field)
641 * @yearp: optional out parameter for the year
642 * @monthp: optional out parameter for the month
643 * @dayp: optional out parameter for the day
645 * The date field is assumed to be in the form resembling
646 * [mm[/dd]]/yy[yy] and the result is stored in the out
647 * parameters any or all of which can be omitted.
649 * If the field doesn't exist, all out parameters are set to zero
650 * and false is returned. Otherwise, true is returned with any
651 * invalid part of date set to zero.
653 * On return, year, month and day are guaranteed to be in the
654 * range of [0,9999], [0,12] and [0,31] respectively.
656 bool dmi_get_date(int field
, int *yearp
, int *monthp
, int *dayp
)
658 int year
= 0, month
= 0, day
= 0;
663 s
= dmi_get_system_info(field
);
669 * Determine year first. We assume the date string resembles
670 * mm/dd/yy[yy] but the original code extracted only the year
671 * from the end. Keep the behavior in the spirit of no
679 year
= simple_strtoul(y
, &e
, 10);
680 if (y
!= e
&& year
< 100) { /* 2-digit year */
682 if (year
< 1996) /* no dates < spec 1.0 */
685 if (year
> 9999) /* year should fit in %04d */
688 /* parse the mm and dd */
689 month
= simple_strtoul(s
, &e
, 10);
690 if (s
== e
|| *e
!= '/' || !month
|| month
> 12) {
696 day
= simple_strtoul(s
, &e
, 10);
697 if (s
== y
|| s
== e
|| *e
!= '/' || day
> 31)
708 EXPORT_SYMBOL(dmi_get_date
);
711 * dmi_walk - Walk the DMI table and get called back for every record
712 * @decode: Callback function
713 * @private_data: Private data to be passed to the callback function
715 * Returns -1 when the DMI table can't be reached, 0 on success.
717 int dmi_walk(void (*decode
)(const struct dmi_header
*, void *),
725 buf
= ioremap(dmi_base
, dmi_len
);
729 dmi_table(buf
, dmi_len
, dmi_num
, decode
, private_data
);
734 EXPORT_SYMBOL_GPL(dmi_walk
);
737 * dmi_match - compare a string to the dmi field (if exists)
738 * @f: DMI field identifier
739 * @str: string to compare the DMI field to
741 * Returns true if the requested field equals to the str (including NULL).
743 bool dmi_match(enum dmi_field f
, const char *str
)
745 const char *info
= dmi_get_system_info(f
);
747 if (info
== NULL
|| str
== NULL
)
750 return !strcmp(info
, str
);
752 EXPORT_SYMBOL_GPL(dmi_match
);
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