1 #include <linux/types.h>
2 #include <linux/string.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
7 #include <linux/bootmem.h>
11 * DMI stands for "Desktop Management Interface". It is part
12 * of and an antecedent to, SMBIOS, which stands for System
13 * Management BIOS. See further: http://www.dmtf.org/standards
15 static char dmi_empty_string
[] = " ";
18 * Catch too early calls to dmi_check_system():
20 static int dmi_initialized
;
22 static const char * __init
dmi_string_nosave(const struct dmi_header
*dm
, u8 s
)
24 const u8
*bp
= ((u8
*) dm
) + dm
->length
;
28 while (s
> 0 && *bp
) {
34 size_t len
= strlen(bp
)+1;
35 size_t cmp_len
= len
> 8 ? 8 : len
;
37 if (!memcmp(bp
, dmi_empty_string
, cmp_len
))
38 return dmi_empty_string
;
46 static char * __init
dmi_string(const struct dmi_header
*dm
, u8 s
)
48 const char *bp
= dmi_string_nosave(dm
, s
);
52 if (bp
== dmi_empty_string
)
53 return dmi_empty_string
;
60 printk(KERN_ERR
"dmi_string: cannot allocate %Zu bytes.\n", len
);
66 * We have to be cautious here. We have seen BIOSes with DMI pointers
67 * pointing to completely the wrong place for example
69 static void dmi_table(u8
*buf
, int len
, int num
,
70 void (*decode
)(const struct dmi_header
*, void *),
77 * Stop when we see all the items the table claimed to have
78 * OR we run off the end of the table (also happens)
80 while ((i
< num
) && (data
- buf
+ sizeof(struct dmi_header
)) <= len
) {
81 const struct dmi_header
*dm
= (const struct dmi_header
*)data
;
84 * We want to know the total length (formatted area and
85 * strings) before decoding to make sure we won't run off the
86 * table in dmi_decode or dmi_string
89 while ((data
- buf
< len
- 1) && (data
[0] || data
[1]))
91 if (data
- buf
< len
- 1)
92 decode(dm
, private_data
);
102 static int __init
dmi_walk_early(void (*decode
)(const struct dmi_header
*,
107 buf
= dmi_ioremap(dmi_base
, dmi_len
);
111 dmi_table(buf
, dmi_len
, dmi_num
, decode
, NULL
);
113 dmi_iounmap(buf
, dmi_len
);
117 static int __init
dmi_checksum(const u8
*buf
)
122 for (a
= 0; a
< 15; a
++)
128 static char *dmi_ident
[DMI_STRING_MAX
];
129 static LIST_HEAD(dmi_devices
);
135 static void __init
dmi_save_ident(const struct dmi_header
*dm
, int slot
, int string
)
137 const char *d
= (const char*) dm
;
143 p
= dmi_string(dm
, d
[string
]);
150 static void __init
dmi_save_uuid(const struct dmi_header
*dm
, int slot
, int index
)
152 const u8
*d
= (u8
*) dm
+ index
;
154 int is_ff
= 1, is_00
= 1, i
;
159 for (i
= 0; i
< 16 && (is_ff
|| is_00
); i
++) {
160 if(d
[i
] != 0x00) is_ff
= 0;
161 if(d
[i
] != 0xFF) is_00
= 0;
167 s
= dmi_alloc(16*2+4+1);
171 sprintf(s
, "%pUB", d
);
176 static void __init
dmi_save_type(const struct dmi_header
*dm
, int slot
, int index
)
178 const u8
*d
= (u8
*) dm
+ index
;
188 sprintf(s
, "%u", *d
& 0x7F);
192 static void __init
dmi_save_one_device(int type
, const char *name
)
194 struct dmi_device
*dev
;
196 /* No duplicate device */
197 if (dmi_find_device(type
, name
, NULL
))
200 dev
= dmi_alloc(sizeof(*dev
) + strlen(name
) + 1);
202 printk(KERN_ERR
"dmi_save_one_device: out of memory.\n");
207 strcpy((char *)(dev
+ 1), name
);
208 dev
->name
= (char *)(dev
+ 1);
209 dev
->device_data
= NULL
;
210 list_add(&dev
->list
, &dmi_devices
);
213 static void __init
dmi_save_devices(const struct dmi_header
*dm
)
215 int i
, count
= (dm
->length
- sizeof(struct dmi_header
)) / 2;
217 for (i
= 0; i
< count
; i
++) {
218 const char *d
= (char *)(dm
+ 1) + (i
* 2);
220 /* Skip disabled device */
221 if ((*d
& 0x80) == 0)
224 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
+ 1)));
228 static void __init
dmi_save_oem_strings_devices(const struct dmi_header
*dm
)
230 int i
, count
= *(u8
*)(dm
+ 1);
231 struct dmi_device
*dev
;
233 for (i
= 1; i
<= count
; i
++) {
234 char *devname
= dmi_string(dm
, i
);
236 if (devname
== dmi_empty_string
)
239 dev
= dmi_alloc(sizeof(*dev
));
242 "dmi_save_oem_strings_devices: out of memory.\n");
246 dev
->type
= DMI_DEV_TYPE_OEM_STRING
;
248 dev
->device_data
= NULL
;
250 list_add(&dev
->list
, &dmi_devices
);
254 static void __init
dmi_save_ipmi_device(const struct dmi_header
*dm
)
256 struct dmi_device
*dev
;
259 data
= dmi_alloc(dm
->length
);
261 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
265 memcpy(data
, dm
, dm
->length
);
267 dev
= dmi_alloc(sizeof(*dev
));
269 printk(KERN_ERR
"dmi_save_ipmi_device: out of memory.\n");
273 dev
->type
= DMI_DEV_TYPE_IPMI
;
274 dev
->name
= "IPMI controller";
275 dev
->device_data
= data
;
277 list_add_tail(&dev
->list
, &dmi_devices
);
280 static void __init
dmi_save_dev_onboard(int instance
, int segment
, int bus
,
281 int devfn
, const char *name
)
283 struct dmi_dev_onboard
*onboard_dev
;
285 onboard_dev
= dmi_alloc(sizeof(*onboard_dev
) + strlen(name
) + 1);
287 printk(KERN_ERR
"dmi_save_dev_onboard: out of memory.\n");
290 onboard_dev
->instance
= instance
;
291 onboard_dev
->segment
= segment
;
292 onboard_dev
->bus
= bus
;
293 onboard_dev
->devfn
= devfn
;
295 strcpy((char *)&onboard_dev
[1], name
);
296 onboard_dev
->dev
.type
= DMI_DEV_TYPE_DEV_ONBOARD
;
297 onboard_dev
->dev
.name
= (char *)&onboard_dev
[1];
298 onboard_dev
->dev
.device_data
= onboard_dev
;
300 list_add(&onboard_dev
->dev
.list
, &dmi_devices
);
303 static void __init
dmi_save_extended_devices(const struct dmi_header
*dm
)
305 const u8
*d
= (u8
*) dm
+ 5;
307 /* Skip disabled device */
308 if ((*d
& 0x80) == 0)
311 dmi_save_dev_onboard(*(d
+1), *(u16
*)(d
+2), *(d
+4), *(d
+5),
312 dmi_string_nosave(dm
, *(d
-1)));
313 dmi_save_one_device(*d
& 0x7f, dmi_string_nosave(dm
, *(d
- 1)));
317 * Process a DMI table entry. Right now all we care about are the BIOS
318 * and machine entries. For 2.5 we should pull the smbus controller info
321 static void __init
dmi_decode(const struct dmi_header
*dm
, void *dummy
)
324 case 0: /* BIOS Information */
325 dmi_save_ident(dm
, DMI_BIOS_VENDOR
, 4);
326 dmi_save_ident(dm
, DMI_BIOS_VERSION
, 5);
327 dmi_save_ident(dm
, DMI_BIOS_DATE
, 8);
329 case 1: /* System Information */
330 dmi_save_ident(dm
, DMI_SYS_VENDOR
, 4);
331 dmi_save_ident(dm
, DMI_PRODUCT_NAME
, 5);
332 dmi_save_ident(dm
, DMI_PRODUCT_VERSION
, 6);
333 dmi_save_ident(dm
, DMI_PRODUCT_SERIAL
, 7);
334 dmi_save_uuid(dm
, DMI_PRODUCT_UUID
, 8);
336 case 2: /* Base Board Information */
337 dmi_save_ident(dm
, DMI_BOARD_VENDOR
, 4);
338 dmi_save_ident(dm
, DMI_BOARD_NAME
, 5);
339 dmi_save_ident(dm
, DMI_BOARD_VERSION
, 6);
340 dmi_save_ident(dm
, DMI_BOARD_SERIAL
, 7);
341 dmi_save_ident(dm
, DMI_BOARD_ASSET_TAG
, 8);
343 case 3: /* Chassis Information */
344 dmi_save_ident(dm
, DMI_CHASSIS_VENDOR
, 4);
345 dmi_save_type(dm
, DMI_CHASSIS_TYPE
, 5);
346 dmi_save_ident(dm
, DMI_CHASSIS_VERSION
, 6);
347 dmi_save_ident(dm
, DMI_CHASSIS_SERIAL
, 7);
348 dmi_save_ident(dm
, DMI_CHASSIS_ASSET_TAG
, 8);
350 case 10: /* Onboard Devices Information */
351 dmi_save_devices(dm
);
353 case 11: /* OEM Strings */
354 dmi_save_oem_strings_devices(dm
);
356 case 38: /* IPMI Device Information */
357 dmi_save_ipmi_device(dm
);
359 case 41: /* Onboard Devices Extended Information */
360 dmi_save_extended_devices(dm
);
364 static int __init
dmi_present(const char __iomem
*p
)
368 memcpy_fromio(buf
, p
, 15);
369 if ((memcmp(buf
, "_DMI_", 5) == 0) && dmi_checksum(buf
)) {
370 dmi_num
= (buf
[13] << 8) | buf
[12];
371 dmi_len
= (buf
[7] << 8) | buf
[6];
372 dmi_base
= (buf
[11] << 24) | (buf
[10] << 16) |
373 (buf
[9] << 8) | buf
[8];
376 * DMI version 0.0 means that the real version is taken from
377 * the SMBIOS version, which we don't know at this point.
380 printk(KERN_INFO
"DMI %d.%d present.\n",
381 buf
[14] >> 4, buf
[14] & 0xF);
383 printk(KERN_INFO
"DMI present.\n");
384 if (dmi_walk_early(dmi_decode
) == 0)
390 void __init
dmi_scan_machine(void)
396 if (efi
.smbios
== EFI_INVALID_TABLE_ADDR
)
399 /* This is called as a core_initcall() because it isn't
400 * needed during early boot. This also means we can
401 * iounmap the space when we're done with it.
403 p
= dmi_ioremap(efi
.smbios
, 32);
407 rc
= dmi_present(p
+ 0x10); /* offset of _DMI_ string */
416 * no iounmap() for that ioremap(); it would be a no-op, but
417 * it's so early in setup that sucker gets confused into doing
418 * what it shouldn't if we actually call it.
420 p
= dmi_ioremap(0xF0000, 0x10000);
424 for (q
= p
; q
< p
+ 0x10000; q
+= 16) {
428 dmi_iounmap(p
, 0x10000);
432 dmi_iounmap(p
, 0x10000);
435 printk(KERN_INFO
"DMI not present or invalid.\n");
441 * dmi_matches - check if dmi_system_id structure matches system DMI data
442 * @dmi: pointer to the dmi_system_id structure to check
444 static bool dmi_matches(const struct dmi_system_id
*dmi
)
448 WARN(!dmi_initialized
, KERN_ERR
"dmi check: not initialized yet.\n");
450 for (i
= 0; i
< ARRAY_SIZE(dmi
->matches
); i
++) {
451 int s
= dmi
->matches
[i
].slot
;
455 && strstr(dmi_ident
[s
], dmi
->matches
[i
].substr
))
464 * dmi_is_end_of_table - check for end-of-table marker
465 * @dmi: pointer to the dmi_system_id structure to check
467 static bool dmi_is_end_of_table(const struct dmi_system_id
*dmi
)
469 return dmi
->matches
[0].slot
== DMI_NONE
;
473 * dmi_check_system - check system DMI data
474 * @list: array of dmi_system_id structures to match against
475 * All non-null elements of the list must match
476 * their slot's (field index's) data (i.e., each
477 * list string must be a substring of the specified
478 * DMI slot's string data) to be considered a
481 * Walk the blacklist table running matching functions until someone
482 * returns non zero or we hit the end. Callback function is called for
483 * each successful match. Returns the number of matches.
485 int dmi_check_system(const struct dmi_system_id
*list
)
488 const struct dmi_system_id
*d
;
490 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
491 if (dmi_matches(d
)) {
493 if (d
->callback
&& d
->callback(d
))
499 EXPORT_SYMBOL(dmi_check_system
);
502 * dmi_first_match - find dmi_system_id structure matching system DMI data
503 * @list: array of dmi_system_id structures to match against
504 * All non-null elements of the list must match
505 * their slot's (field index's) data (i.e., each
506 * list string must be a substring of the specified
507 * DMI slot's string data) to be considered a
510 * Walk the blacklist table until the first match is found. Return the
511 * pointer to the matching entry or NULL if there's no match.
513 const struct dmi_system_id
*dmi_first_match(const struct dmi_system_id
*list
)
515 const struct dmi_system_id
*d
;
517 for (d
= list
; !dmi_is_end_of_table(d
); d
++)
523 EXPORT_SYMBOL(dmi_first_match
);
526 * dmi_get_system_info - return DMI data value
527 * @field: data index (see enum dmi_field)
529 * Returns one DMI data value, can be used to perform
530 * complex DMI data checks.
532 const char *dmi_get_system_info(int field
)
534 return dmi_ident
[field
];
536 EXPORT_SYMBOL(dmi_get_system_info
);
539 * dmi_name_in_serial - Check if string is in the DMI product serial information
540 * @str: string to check for
542 int dmi_name_in_serial(const char *str
)
544 int f
= DMI_PRODUCT_SERIAL
;
545 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
551 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
552 * @str: Case sensitive Name
554 int dmi_name_in_vendors(const char *str
)
556 static int fields
[] = { DMI_BIOS_VENDOR
, DMI_BIOS_VERSION
, DMI_SYS_VENDOR
,
557 DMI_PRODUCT_NAME
, DMI_PRODUCT_VERSION
, DMI_BOARD_VENDOR
,
558 DMI_BOARD_NAME
, DMI_BOARD_VERSION
, DMI_NONE
};
560 for (i
= 0; fields
[i
] != DMI_NONE
; i
++) {
562 if (dmi_ident
[f
] && strstr(dmi_ident
[f
], str
))
567 EXPORT_SYMBOL(dmi_name_in_vendors
);
570 * dmi_find_device - find onboard device by type/name
571 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
572 * @name: device name string or %NULL to match all
573 * @from: previous device found in search, or %NULL for new search.
575 * Iterates through the list of known onboard devices. If a device is
576 * found with a matching @vendor and @device, a pointer to its device
577 * structure is returned. Otherwise, %NULL is returned.
578 * A new search is initiated by passing %NULL as the @from argument.
579 * If @from is not %NULL, searches continue from next device.
581 const struct dmi_device
* dmi_find_device(int type
, const char *name
,
582 const struct dmi_device
*from
)
584 const struct list_head
*head
= from
? &from
->list
: &dmi_devices
;
587 for(d
= head
->next
; d
!= &dmi_devices
; d
= d
->next
) {
588 const struct dmi_device
*dev
=
589 list_entry(d
, struct dmi_device
, list
);
591 if (((type
== DMI_DEV_TYPE_ANY
) || (dev
->type
== type
)) &&
592 ((name
== NULL
) || (strcmp(dev
->name
, name
) == 0)))
598 EXPORT_SYMBOL(dmi_find_device
);
601 * dmi_get_date - parse a DMI date
602 * @field: data index (see enum dmi_field)
603 * @yearp: optional out parameter for the year
604 * @monthp: optional out parameter for the month
605 * @dayp: optional out parameter for the day
607 * The date field is assumed to be in the form resembling
608 * [mm[/dd]]/yy[yy] and the result is stored in the out
609 * parameters any or all of which can be omitted.
611 * If the field doesn't exist, all out parameters are set to zero
612 * and false is returned. Otherwise, true is returned with any
613 * invalid part of date set to zero.
615 * On return, year, month and day are guaranteed to be in the
616 * range of [0,9999], [0,12] and [0,31] respectively.
618 bool dmi_get_date(int field
, int *yearp
, int *monthp
, int *dayp
)
620 int year
= 0, month
= 0, day
= 0;
625 s
= dmi_get_system_info(field
);
631 * Determine year first. We assume the date string resembles
632 * mm/dd/yy[yy] but the original code extracted only the year
633 * from the end. Keep the behavior in the spirit of no
641 year
= simple_strtoul(y
, &e
, 10);
642 if (y
!= e
&& year
< 100) { /* 2-digit year */
644 if (year
< 1996) /* no dates < spec 1.0 */
647 if (year
> 9999) /* year should fit in %04d */
650 /* parse the mm and dd */
651 month
= simple_strtoul(s
, &e
, 10);
652 if (s
== e
|| *e
!= '/' || !month
|| month
> 12) {
658 day
= simple_strtoul(s
, &e
, 10);
659 if (s
== y
|| s
== e
|| *e
!= '/' || day
> 31)
670 EXPORT_SYMBOL(dmi_get_date
);
673 * dmi_walk - Walk the DMI table and get called back for every record
674 * @decode: Callback function
675 * @private_data: Private data to be passed to the callback function
677 * Returns -1 when the DMI table can't be reached, 0 on success.
679 int dmi_walk(void (*decode
)(const struct dmi_header
*, void *),
687 buf
= ioremap(dmi_base
, dmi_len
);
691 dmi_table(buf
, dmi_len
, dmi_num
, decode
, private_data
);
696 EXPORT_SYMBOL_GPL(dmi_walk
);
699 * dmi_match - compare a string to the dmi field (if exists)
700 * @f: DMI field identifier
701 * @str: string to compare the DMI field to
703 * Returns true if the requested field equals to the str (including NULL).
705 bool dmi_match(enum dmi_field f
, const char *str
)
707 const char *info
= dmi_get_system_info(f
);
709 if (info
== NULL
|| str
== NULL
)
712 return !strcmp(info
, str
);
714 EXPORT_SYMBOL_GPL(dmi_match
);