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_extended_devices(const struct dmi_header *dm)
282 const u8 *d = (u8*) dm + 5;
284 /* Skip disabled device */
285 if ((*d & 0x80) == 0)
288 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
292 * Process a DMI table entry. Right now all we care about are the BIOS
293 * and machine entries. For 2.5 we should pull the smbus controller info
296 static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
299 case 0: /* BIOS Information */
300 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
301 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
302 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
304 case 1: /* System Information */
305 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
306 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
307 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
308 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
309 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
311 case 2: /* Base Board Information */
312 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
313 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
314 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
315 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
316 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
318 case 3: /* Chassis Information */
319 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
320 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
321 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
322 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
323 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
325 case 10: /* Onboard Devices Information */
326 dmi_save_devices(dm);
328 case 11: /* OEM Strings */
329 dmi_save_oem_strings_devices(dm);
331 case 38: /* IPMI Device Information */
332 dmi_save_ipmi_device(dm);
334 case 41: /* Onboard Devices Extended Information */
335 dmi_save_extended_devices(dm);
339 static int __init dmi_present(const char __iomem *p)
343 memcpy_fromio(buf, p, 15);
344 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
345 dmi_num = (buf[13] << 8) | buf[12];
346 dmi_len = (buf[7] << 8) | buf[6];
347 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
348 (buf[9] << 8) | buf[8];
351 * DMI version 0.0 means that the real version is taken from
352 * the SMBIOS version, which we don't know at this point.
355 printk(KERN_INFO "DMI %d.%d present.\n",
356 buf[14] >> 4, buf[14] & 0xF);
358 printk(KERN_INFO "DMI present.\n");
359 if (dmi_walk_early(dmi_decode) == 0)
365 void __init dmi_scan_machine(void)
371 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
374 /* This is called as a core_initcall() because it isn't
375 * needed during early boot. This also means we can
376 * iounmap the space when we're done with it.
378 p = dmi_ioremap(efi.smbios, 32);
382 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
391 * no iounmap() for that ioremap(); it would be a no-op, but
392 * it's so early in setup that sucker gets confused into doing
393 * what it shouldn't if we actually call it.
395 p = dmi_ioremap(0xF0000, 0x10000);
399 for (q = p; q < p + 0x10000; q += 16) {
403 dmi_iounmap(p, 0x10000);
407 dmi_iounmap(p, 0x10000);
410 printk(KERN_INFO "DMI not present or invalid.\n");
416 * dmi_matches - check if dmi_system_id structure matches system DMI data
417 * @dmi: pointer to the dmi_system_id structure to check
419 static bool dmi_matches(const struct dmi_system_id *dmi)
423 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
425 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
426 int s = dmi->matches[i].slot;
430 && strstr(dmi_ident[s], dmi->matches[i].substr))
439 * dmi_is_end_of_table - check for end-of-table marker
440 * @dmi: pointer to the dmi_system_id structure to check
442 static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
444 return dmi->matches[0].slot == DMI_NONE;
448 * dmi_check_system - check system DMI data
449 * @list: array of dmi_system_id structures to match against
450 * All non-null elements of the list must match
451 * their slot's (field index's) data (i.e., each
452 * list string must be a substring of the specified
453 * DMI slot's string data) to be considered a
456 * Walk the blacklist table running matching functions until someone
457 * returns non zero or we hit the end. Callback function is called for
458 * each successful match. Returns the number of matches.
460 int dmi_check_system(const struct dmi_system_id *list)
463 const struct dmi_system_id *d;
465 for (d = list; !dmi_is_end_of_table(d); d++)
466 if (dmi_matches(d)) {
468 if (d->callback && d->callback(d))
474 EXPORT_SYMBOL(dmi_check_system);
477 * dmi_first_match - find dmi_system_id structure matching system DMI data
478 * @list: array of dmi_system_id structures to match against
479 * All non-null elements of the list must match
480 * their slot's (field index's) data (i.e., each
481 * list string must be a substring of the specified
482 * DMI slot's string data) to be considered a
485 * Walk the blacklist table until the first match is found. Return the
486 * pointer to the matching entry or NULL if there's no match.
488 const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
490 const struct dmi_system_id *d;
492 for (d = list; !dmi_is_end_of_table(d); d++)
498 EXPORT_SYMBOL(dmi_first_match);
501 * dmi_get_system_info - return DMI data value
502 * @field: data index (see enum dmi_field)
504 * Returns one DMI data value, can be used to perform
505 * complex DMI data checks.
507 const char *dmi_get_system_info(int field)
509 return dmi_ident[field];
511 EXPORT_SYMBOL(dmi_get_system_info);
514 * dmi_name_in_serial - Check if string is in the DMI product serial information
515 * @str: string to check for
517 int dmi_name_in_serial(const char *str)
519 int f = DMI_PRODUCT_SERIAL;
520 if (dmi_ident[f] && strstr(dmi_ident[f], str))
526 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
527 * @str: Case sensitive Name
529 int dmi_name_in_vendors(const char *str)
531 static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
532 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
533 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
535 for (i = 0; fields[i] != DMI_NONE; i++) {
537 if (dmi_ident[f] && strstr(dmi_ident[f], str))
542 EXPORT_SYMBOL(dmi_name_in_vendors);
545 * dmi_find_device - find onboard device by type/name
546 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
547 * @name: device name string or %NULL to match all
548 * @from: previous device found in search, or %NULL for new search.
550 * Iterates through the list of known onboard devices. If a device is
551 * found with a matching @vendor and @device, a pointer to its device
552 * structure is returned. Otherwise, %NULL is returned.
553 * A new search is initiated by passing %NULL as the @from argument.
554 * If @from is not %NULL, searches continue from next device.
556 const struct dmi_device * dmi_find_device(int type, const char *name,
557 const struct dmi_device *from)
559 const struct list_head *head = from ? &from->list : &dmi_devices;
562 for(d = head->next; d != &dmi_devices; d = d->next) {
563 const struct dmi_device *dev =
564 list_entry(d, struct dmi_device, list);
566 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
567 ((name == NULL) || (strcmp(dev->name, name) == 0)))
573 EXPORT_SYMBOL(dmi_find_device);
576 * dmi_get_date - parse a DMI date
577 * @field: data index (see enum dmi_field)
578 * @yearp: optional out parameter for the year
579 * @monthp: optional out parameter for the month
580 * @dayp: optional out parameter for the day
582 * The date field is assumed to be in the form resembling
583 * [mm[/dd]]/yy[yy] and the result is stored in the out
584 * parameters any or all of which can be omitted.
586 * If the field doesn't exist, all out parameters are set to zero
587 * and false is returned. Otherwise, true is returned with any
588 * invalid part of date set to zero.
590 * On return, year, month and day are guaranteed to be in the
591 * range of [0,9999], [0,12] and [0,31] respectively.
593 bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
595 int year = 0, month = 0, day = 0;
600 s = dmi_get_system_info(field);
606 * Determine year first. We assume the date string resembles
607 * mm/dd/yy[yy] but the original code extracted only the year
608 * from the end. Keep the behavior in the spirit of no
616 year = simple_strtoul(y, &e, 10);
617 if (y != e && year < 100) { /* 2-digit year */
619 if (year < 1996) /* no dates < spec 1.0 */
622 if (year > 9999) /* year should fit in %04d */
625 /* parse the mm and dd */
626 month = simple_strtoul(s, &e, 10);
627 if (s == e || *e != '/' || !month || month > 12) {
633 day = simple_strtoul(s, &e, 10);
634 if (s == y || s == e || *e != '/' || day > 31)
645 EXPORT_SYMBOL(dmi_get_date);
648 * dmi_walk - Walk the DMI table and get called back for every record
649 * @decode: Callback function
650 * @private_data: Private data to be passed to the callback function
652 * Returns -1 when the DMI table can't be reached, 0 on success.
654 int dmi_walk(void (*decode)(const struct dmi_header *, void *),
662 buf = ioremap(dmi_base, dmi_len);
666 dmi_table(buf, dmi_len, dmi_num, decode, private_data);
671 EXPORT_SYMBOL_GPL(dmi_walk);
674 * dmi_match - compare a string to the dmi field (if exists)
675 * @f: DMI field identifier
676 * @str: string to compare the DMI field to
678 * Returns true if the requested field equals to the str (including NULL).
680 bool dmi_match(enum dmi_field f, const char *str)
682 const char *info = dmi_get_system_info(f);
684 if (info == NULL || str == NULL)
687 return !strcmp(info, str);
689 EXPORT_SYMBOL_GPL(dmi_match);