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[] = " ";
19 static u16 __initdata dmi_ver;
21 * Catch too early calls to dmi_check_system():
23 static int dmi_initialized;
25 /* DMI system identification string used during boot */
26 static char dmi_ids_string[128] __initdata;
28 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
30 const u8 *bp = ((u8 *) dm) + dm->length;
34 while (s > 0 && *bp) {
40 size_t len = strlen(bp)+1;
41 size_t cmp_len = len > 8 ? 8 : len;
43 if (!memcmp(bp, dmi_empty_string, cmp_len))
44 return dmi_empty_string;
52 static char * __init dmi_string(const struct dmi_header *dm, u8 s)
54 const char *bp = dmi_string_nosave(dm, s);
58 if (bp == dmi_empty_string)
59 return dmi_empty_string;
66 printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
72 * We have to be cautious here. We have seen BIOSes with DMI pointers
73 * pointing to completely the wrong place for example
75 static void dmi_table(u8 *buf, int len, int num,
76 void (*decode)(const struct dmi_header *, void *),
83 * Stop when we see all the items the table claimed to have
84 * OR we run off the end of the table (also happens)
86 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
87 const struct dmi_header *dm = (const struct dmi_header *)data;
90 * We want to know the total length (formatted area and
91 * strings) before decoding to make sure we won't run off the
92 * table in dmi_decode or dmi_string
95 while ((data - buf < len - 1) && (data[0] || data[1]))
97 if (data - buf < len - 1)
98 decode(dm, private_data);
108 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
113 buf = dmi_ioremap(dmi_base, dmi_len);
117 dmi_table(buf, dmi_len, dmi_num, decode, NULL);
119 add_device_randomness(buf, dmi_len);
121 dmi_iounmap(buf, dmi_len);
125 static int __init dmi_checksum(const u8 *buf, u8 len)
130 for (a = 0; a < len; a++)
136 static char *dmi_ident[DMI_STRING_MAX];
137 static LIST_HEAD(dmi_devices);
143 static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
145 const char *d = (const char*) dm;
151 p = dmi_string(dm, d[string]);
158 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
160 const u8 *d = (u8*) dm + index;
162 int is_ff = 1, is_00 = 1, i;
167 for (i = 0; i < 16 && (is_ff || is_00); i++) {
177 s = dmi_alloc(16*2+4+1);
182 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
183 * the UUID are supposed to be little-endian encoded. The specification
184 * says that this is the defacto standard.
186 if (dmi_ver >= 0x0206)
187 sprintf(s, "%pUL", d);
189 sprintf(s, "%pUB", d);
194 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
196 const u8 *d = (u8*) dm + index;
206 sprintf(s, "%u", *d & 0x7F);
210 static void __init dmi_save_one_device(int type, const char *name)
212 struct dmi_device *dev;
214 /* No duplicate device */
215 if (dmi_find_device(type, name, NULL))
218 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
220 printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
225 strcpy((char *)(dev + 1), name);
226 dev->name = (char *)(dev + 1);
227 dev->device_data = NULL;
228 list_add(&dev->list, &dmi_devices);
231 static void __init dmi_save_devices(const struct dmi_header *dm)
233 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
235 for (i = 0; i < count; i++) {
236 const char *d = (char *)(dm + 1) + (i * 2);
238 /* Skip disabled device */
239 if ((*d & 0x80) == 0)
242 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
246 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
248 int i, count = *(u8 *)(dm + 1);
249 struct dmi_device *dev;
251 for (i = 1; i <= count; i++) {
252 char *devname = dmi_string(dm, i);
254 if (devname == dmi_empty_string)
257 dev = dmi_alloc(sizeof(*dev));
260 "dmi_save_oem_strings_devices: out of memory.\n");
264 dev->type = DMI_DEV_TYPE_OEM_STRING;
266 dev->device_data = NULL;
268 list_add(&dev->list, &dmi_devices);
272 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
274 struct dmi_device *dev;
277 data = dmi_alloc(dm->length);
279 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
283 memcpy(data, dm, dm->length);
285 dev = dmi_alloc(sizeof(*dev));
287 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
291 dev->type = DMI_DEV_TYPE_IPMI;
292 dev->name = "IPMI controller";
293 dev->device_data = data;
295 list_add_tail(&dev->list, &dmi_devices);
298 static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
299 int devfn, const char *name)
301 struct dmi_dev_onboard *onboard_dev;
303 onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
305 printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
308 onboard_dev->instance = instance;
309 onboard_dev->segment = segment;
310 onboard_dev->bus = bus;
311 onboard_dev->devfn = devfn;
313 strcpy((char *)&onboard_dev[1], name);
314 onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
315 onboard_dev->dev.name = (char *)&onboard_dev[1];
316 onboard_dev->dev.device_data = onboard_dev;
318 list_add(&onboard_dev->dev.list, &dmi_devices);
321 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
323 const u8 *d = (u8*) dm + 5;
325 /* Skip disabled device */
326 if ((*d & 0x80) == 0)
329 dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
330 dmi_string_nosave(dm, *(d-1)));
331 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
335 * Process a DMI table entry. Right now all we care about are the BIOS
336 * and machine entries. For 2.5 we should pull the smbus controller info
339 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
342 case 0: /* BIOS Information */
343 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
344 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
345 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
347 case 1: /* System Information */
348 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
349 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
350 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
351 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
352 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
354 case 2: /* Base Board Information */
355 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
356 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
357 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
358 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
359 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
361 case 3: /* Chassis Information */
362 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
363 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
364 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
365 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
366 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
368 case 10: /* Onboard Devices Information */
369 dmi_save_devices(dm);
371 case 11: /* OEM Strings */
372 dmi_save_oem_strings_devices(dm);
374 case 38: /* IPMI Device Information */
375 dmi_save_ipmi_device(dm);
377 case 41: /* Onboard Devices Extended Information */
378 dmi_save_extended_devices(dm);
382 static int __init print_filtered(char *buf, size_t len, const char *info)
390 for (p = info; *p; p++)
392 c += scnprintf(buf + c, len - c, "%c", *p);
394 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
398 static void __init dmi_format_ids(char *buf, size_t len)
401 const char *board; /* Board Name is optional */
403 c += print_filtered(buf + c, len - c,
404 dmi_get_system_info(DMI_SYS_VENDOR));
405 c += scnprintf(buf + c, len - c, " ");
406 c += print_filtered(buf + c, len - c,
407 dmi_get_system_info(DMI_PRODUCT_NAME));
409 board = dmi_get_system_info(DMI_BOARD_NAME);
411 c += scnprintf(buf + c, len - c, "/");
412 c += print_filtered(buf + c, len - c, board);
414 c += scnprintf(buf + c, len - c, ", BIOS ");
415 c += print_filtered(buf + c, len - c,
416 dmi_get_system_info(DMI_BIOS_VERSION));
417 c += scnprintf(buf + c, len - c, " ");
418 c += print_filtered(buf + c, len - c,
419 dmi_get_system_info(DMI_BIOS_DATE));
422 static int __init dmi_present(const u8 *buf)
426 if (memcmp(buf, "_SM_", 4) == 0 &&
427 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
428 smbios_ver = (buf[6] << 8) + buf[7];
430 /* Some BIOS report weird SMBIOS version, fix that up */
431 switch (smbios_ver) {
434 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n",
435 smbios_ver & 0xFF, 3);
439 pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6);
449 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
450 dmi_num = (buf[13] << 8) | buf[12];
451 dmi_len = (buf[7] << 8) | buf[6];
452 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
453 (buf[9] << 8) | buf[8];
455 if (dmi_walk_early(dmi_decode) == 0) {
457 dmi_ver = smbios_ver;
458 pr_info("SMBIOS %d.%d present.\n",
459 dmi_ver >> 8, dmi_ver & 0xFF);
461 dmi_ver = (buf[14] & 0xF0) << 4 |
463 pr_info("Legacy DMI %d.%d present.\n",
464 dmi_ver >> 8, dmi_ver & 0xFF);
466 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
467 printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
475 void __init dmi_scan_machine(void)
480 if (efi_enabled(EFI_CONFIG_TABLES)) {
481 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
484 /* This is called as a core_initcall() because it isn't
485 * needed during early boot. This also means we can
486 * iounmap the space when we're done with it.
488 p = dmi_ioremap(efi.smbios, 32);
491 memcpy_fromio(buf, p, 32);
494 if (!dmi_present(buf)) {
501 * no iounmap() for that ioremap(); it would be a no-op, but
502 * it's so early in setup that sucker gets confused into doing
503 * what it shouldn't if we actually call it.
505 p = dmi_ioremap(0xF0000, 0x10000);
510 for (q = p; q < p + 0x10000; q += 16) {
511 memcpy_fromio(buf + 16, q, 16);
512 if (!dmi_present(buf)) {
514 dmi_iounmap(p, 0x10000);
517 memcpy(buf, buf + 16, 16);
519 dmi_iounmap(p, 0x10000);
522 printk(KERN_INFO "DMI not present or invalid.\n");
528 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
530 * Invoke dump_stack_set_arch_desc() with DMI system information so that
531 * DMI identifiers are printed out on task dumps. Arch boot code should
532 * call this function after dmi_scan_machine() if it wants to print out DMI
533 * identifiers on task dumps.
535 void __init dmi_set_dump_stack_arch_desc(void)
537 dump_stack_set_arch_desc("%s", dmi_ids_string);
541 * dmi_matches - check if dmi_system_id structure matches system DMI data
542 * @dmi: pointer to the dmi_system_id structure to check
544 static bool dmi_matches(const struct dmi_system_id *dmi)
548 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
550 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
551 int s = dmi->matches[i].slot;
555 if (!dmi->matches[i].exact_match &&
556 strstr(dmi_ident[s], dmi->matches[i].substr))
558 else if (dmi->matches[i].exact_match &&
559 !strcmp(dmi_ident[s], dmi->matches[i].substr))
570 * dmi_is_end_of_table - check for end-of-table marker
571 * @dmi: pointer to the dmi_system_id structure to check
573 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
575 return dmi->matches[0].slot == DMI_NONE;
579 * dmi_check_system - check system DMI data
580 * @list: array of dmi_system_id structures to match against
581 * All non-null elements of the list must match
582 * their slot's (field index's) data (i.e., each
583 * list string must be a substring of the specified
584 * DMI slot's string data) to be considered a
587 * Walk the blacklist table running matching functions until someone
588 * returns non zero or we hit the end. Callback function is called for
589 * each successful match. Returns the number of matches.
591 int dmi_check_system(const struct dmi_system_id *list)
594 const struct dmi_system_id *d;
596 for (d = list; !dmi_is_end_of_table(d); d++)
597 if (dmi_matches(d)) {
599 if (d->callback && d->callback(d))
605 EXPORT_SYMBOL(dmi_check_system);
608 * dmi_first_match - find dmi_system_id structure matching system DMI data
609 * @list: array of dmi_system_id structures to match against
610 * All non-null elements of the list must match
611 * their slot's (field index's) data (i.e., each
612 * list string must be a substring of the specified
613 * DMI slot's string data) to be considered a
616 * Walk the blacklist table until the first match is found. Return the
617 * pointer to the matching entry or NULL if there's no match.
619 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
621 const struct dmi_system_id *d;
623 for (d = list; !dmi_is_end_of_table(d); d++)
629 EXPORT_SYMBOL(dmi_first_match);
632 * dmi_get_system_info - return DMI data value
633 * @field: data index (see enum dmi_field)
635 * Returns one DMI data value, can be used to perform
636 * complex DMI data checks.
638 const char *dmi_get_system_info(int field)
640 return dmi_ident[field];
642 EXPORT_SYMBOL(dmi_get_system_info);
645 * dmi_name_in_serial - Check if string is in the DMI product serial information
646 * @str: string to check for
648 int dmi_name_in_serial(const char *str)
650 int f = DMI_PRODUCT_SERIAL;
651 if (dmi_ident[f] && strstr(dmi_ident[f], str))
657 * dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
658 * @str: Case sensitive Name
660 int dmi_name_in_vendors(const char *str)
662 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
664 for (i = 0; fields[i] != DMI_NONE; i++) {
666 if (dmi_ident[f] && strstr(dmi_ident[f], str))
671 EXPORT_SYMBOL(dmi_name_in_vendors);
674 * dmi_find_device - find onboard device by type/name
675 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
676 * @name: device name string or %NULL to match all
677 * @from: previous device found in search, or %NULL for new search.
679 * Iterates through the list of known onboard devices. If a device is
680 * found with a matching @vendor and @device, a pointer to its device
681 * structure is returned. Otherwise, %NULL is returned.
682 * A new search is initiated by passing %NULL as the @from argument.
683 * If @from is not %NULL, searches continue from next device.
685 const struct dmi_device * dmi_find_device(int type, const char *name,
686 const struct dmi_device *from)
688 const struct list_head *head = from ? &from->list : &dmi_devices;
691 for(d = head->next; d != &dmi_devices; d = d->next) {
692 const struct dmi_device *dev =
693 list_entry(d, struct dmi_device, list);
695 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
696 ((name == NULL) || (strcmp(dev->name, name) == 0)))
702 EXPORT_SYMBOL(dmi_find_device);
705 * dmi_get_date - parse a DMI date
706 * @field: data index (see enum dmi_field)
707 * @yearp: optional out parameter for the year
708 * @monthp: optional out parameter for the month
709 * @dayp: optional out parameter for the day
711 * The date field is assumed to be in the form resembling
712 * [mm[/dd]]/yy[yy] and the result is stored in the out
713 * parameters any or all of which can be omitted.
715 * If the field doesn't exist, all out parameters are set to zero
716 * and false is returned. Otherwise, true is returned with any
717 * invalid part of date set to zero.
719 * On return, year, month and day are guaranteed to be in the
720 * range of [0,9999], [0,12] and [0,31] respectively.
722 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
724 int year = 0, month = 0, day = 0;
729 s = dmi_get_system_info(field);
735 * Determine year first. We assume the date string resembles
736 * mm/dd/yy[yy] but the original code extracted only the year
737 * from the end. Keep the behavior in the spirit of no
745 year = simple_strtoul(y, &e, 10);
746 if (y != e && year < 100) { /* 2-digit year */
748 if (year < 1996) /* no dates < spec 1.0 */
751 if (year > 9999) /* year should fit in %04d */
754 /* parse the mm and dd */
755 month = simple_strtoul(s, &e, 10);
756 if (s == e || *e != '/' || !month || month > 12) {
762 day = simple_strtoul(s, &e, 10);
763 if (s == y || s == e || *e != '/' || day > 31)
774 EXPORT_SYMBOL(dmi_get_date);
777 * dmi_walk - Walk the DMI table and get called back for every record
778 * @decode: Callback function
779 * @private_data: Private data to be passed to the callback function
781 * Returns -1 when the DMI table can't be reached, 0 on success.
783 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
791 buf = ioremap(dmi_base, dmi_len);
795 dmi_table(buf, dmi_len, dmi_num, decode, private_data);
800 EXPORT_SYMBOL_GPL(dmi_walk);
803 * dmi_match - compare a string to the dmi field (if exists)
804 * @f: DMI field identifier
805 * @str: string to compare the DMI field to
807 * Returns true if the requested field equals to the str (including NULL).
809 bool dmi_match(enum dmi_field f, const char *str)
811 const char *info = dmi_get_system_info(f);
813 if (info == NULL || str == NULL)
816 return !strcmp(info, str);
818 EXPORT_SYMBOL_GPL(dmi_match);