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>
8 #include <linux/slab.h>
12 * DMI stands for "Desktop Management Interface". It is part
13 * of and an antecedent to, SMBIOS, which stands for System
14 * Management BIOS. See further: http://www.dmtf.org/standards
16 static char dmi_empty_string[] = " ";
18 static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
20 const u8 *bp = ((u8 *) dm) + dm->length;
24 while (s > 0 && *bp) {
30 size_t len = strlen(bp)+1;
31 size_t cmp_len = len > 8 ? 8 : len;
33 if (!memcmp(bp, dmi_empty_string, cmp_len))
34 return dmi_empty_string;
42 static char * __init dmi_string(const struct dmi_header *dm, u8 s)
44 const char *bp = dmi_string_nosave(dm, s);
48 if (bp == dmi_empty_string)
49 return dmi_empty_string;
56 printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
62 * We have to be cautious here. We have seen BIOSes with DMI pointers
63 * pointing to completely the wrong place for example
65 static void dmi_table(u8 *buf, int len, int num,
66 void (*decode)(const struct dmi_header *))
72 * Stop when we see all the items the table claimed to have
73 * OR we run off the end of the table (also happens)
75 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
76 const struct dmi_header *dm = (const struct dmi_header *)data;
79 * We want to know the total length (formated area and strings)
80 * before decoding to make sure we won't run off the table in
81 * dmi_decode or dmi_string
84 while ((data - buf < len - 1) && (data[0] || data[1]))
86 if (data - buf < len - 1)
97 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *))
101 buf = dmi_ioremap(dmi_base, dmi_len);
105 dmi_table(buf, dmi_len, dmi_num, decode);
107 dmi_iounmap(buf, dmi_len);
111 static int __init dmi_checksum(const u8 *buf)
116 for (a = 0; a < 15; a++)
122 static char *dmi_ident[DMI_STRING_MAX];
123 static LIST_HEAD(dmi_devices);
129 static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
131 const char *d = (const char*) dm;
137 p = dmi_string(dm, d[string]);
144 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
146 const u8 *d = (u8*) dm + index;
148 int is_ff = 1, is_00 = 1, i;
153 for (i = 0; i < 16 && (is_ff || is_00); i++) {
154 if(d[i] != 0x00) is_ff = 0;
155 if(d[i] != 0xFF) is_00 = 0;
161 s = dmi_alloc(16*2+4+1);
166 "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
167 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
168 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
173 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
175 const u8 *d = (u8*) dm + index;
185 sprintf(s, "%u", *d & 0x7F);
189 static void __init dmi_save_one_device(int type, const char *name)
191 struct dmi_device *dev;
193 /* No duplicate device */
194 if (dmi_find_device(type, name, NULL))
197 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
199 printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
204 strcpy((char *)(dev + 1), name);
205 dev->name = (char *)(dev + 1);
206 dev->device_data = NULL;
207 list_add(&dev->list, &dmi_devices);
210 static void __init dmi_save_devices(const struct dmi_header *dm)
212 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
214 for (i = 0; i < count; i++) {
215 const char *d = (char *)(dm + 1) + (i * 2);
217 /* Skip disabled device */
218 if ((*d & 0x80) == 0)
221 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
225 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
227 int i, count = *(u8 *)(dm + 1);
228 struct dmi_device *dev;
230 for (i = 1; i <= count; i++) {
231 char *devname = dmi_string(dm, i);
233 if (devname == dmi_empty_string)
236 dev = dmi_alloc(sizeof(*dev));
239 "dmi_save_oem_strings_devices: out of memory.\n");
243 dev->type = DMI_DEV_TYPE_OEM_STRING;
245 dev->device_data = NULL;
247 list_add(&dev->list, &dmi_devices);
251 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
253 struct dmi_device *dev;
256 data = dmi_alloc(dm->length);
258 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
262 memcpy(data, dm, dm->length);
264 dev = dmi_alloc(sizeof(*dev));
266 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
270 dev->type = DMI_DEV_TYPE_IPMI;
271 dev->name = "IPMI controller";
272 dev->device_data = data;
274 list_add_tail(&dev->list, &dmi_devices);
277 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
279 const u8 *d = (u8*) dm + 5;
281 /* Skip disabled device */
282 if ((*d & 0x80) == 0)
285 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
289 * Process a DMI table entry. Right now all we care about are the BIOS
290 * and machine entries. For 2.5 we should pull the smbus controller info
293 static void __init dmi_decode(const struct dmi_header *dm)
296 case 0: /* BIOS Information */
297 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
298 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
299 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
301 case 1: /* System Information */
302 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
303 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
304 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
305 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
306 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
308 case 2: /* Base Board Information */
309 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
310 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
311 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
312 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
313 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
315 case 3: /* Chassis Information */
316 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
317 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
318 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
319 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
320 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
322 case 10: /* Onboard Devices Information */
323 dmi_save_devices(dm);
325 case 11: /* OEM Strings */
326 dmi_save_oem_strings_devices(dm);
328 case 38: /* IPMI Device Information */
329 dmi_save_ipmi_device(dm);
331 case 41: /* Onboard Devices Extended Information */
332 dmi_save_extended_devices(dm);
336 static int __init dmi_present(const char __iomem *p)
340 memcpy_fromio(buf, p, 15);
341 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
342 dmi_num = (buf[13] << 8) | buf[12];
343 dmi_len = (buf[7] << 8) | buf[6];
344 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
345 (buf[9] << 8) | buf[8];
348 * DMI version 0.0 means that the real version is taken from
349 * the SMBIOS version, which we don't know at this point.
352 printk(KERN_INFO "DMI %d.%d present.\n",
353 buf[14] >> 4, buf[14] & 0xF);
355 printk(KERN_INFO "DMI present.\n");
356 if (dmi_walk_early(dmi_decode) == 0)
362 void __init dmi_scan_machine(void)
368 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
371 /* This is called as a core_initcall() because it isn't
372 * needed during early boot. This also means we can
373 * iounmap the space when we're done with it.
375 p = dmi_ioremap(efi.smbios, 32);
379 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
388 * no iounmap() for that ioremap(); it would be a no-op, but
389 * it's so early in setup that sucker gets confused into doing
390 * what it shouldn't if we actually call it.
392 p = dmi_ioremap(0xF0000, 0x10000);
396 for (q = p; q < p + 0x10000; q += 16) {
400 dmi_iounmap(p, 0x10000);
404 dmi_iounmap(p, 0x10000);
406 out: printk(KERN_INFO "DMI not present or invalid.\n");
410 * dmi_check_system - check system DMI data
411 * @list: array of dmi_system_id structures to match against
412 * All non-null elements of the list must match
413 * their slot's (field index's) data (i.e., each
414 * list string must be a substring of the specified
415 * DMI slot's string data) to be considered a
418 * Walk the blacklist table running matching functions until someone
419 * returns non zero or we hit the end. Callback function is called for
420 * each successful match. Returns the number of matches.
422 int dmi_check_system(const struct dmi_system_id *list)
425 const struct dmi_system_id *d = list;
428 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
429 int s = d->matches[i].slot;
432 if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
438 if (d->callback && d->callback(d))
445 EXPORT_SYMBOL(dmi_check_system);
448 * dmi_get_system_info - return DMI data value
449 * @field: data index (see enum dmi_field)
451 * Returns one DMI data value, can be used to perform
452 * complex DMI data checks.
454 const char *dmi_get_system_info(int field)
456 return dmi_ident[field];
458 EXPORT_SYMBOL(dmi_get_system_info);
462 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
463 * @str: Case sensitive Name
465 int dmi_name_in_vendors(const char *str)
467 static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
468 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
469 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
471 for (i = 0; fields[i] != DMI_NONE; i++) {
473 if (dmi_ident[f] && strstr(dmi_ident[f], str))
478 EXPORT_SYMBOL(dmi_name_in_vendors);
481 * dmi_find_device - find onboard device by type/name
482 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
483 * @name: device name string or %NULL to match all
484 * @from: previous device found in search, or %NULL for new search.
486 * Iterates through the list of known onboard devices. If a device is
487 * found with a matching @vendor and @device, a pointer to its device
488 * structure is returned. Otherwise, %NULL is returned.
489 * A new search is initiated by passing %NULL as the @from argument.
490 * If @from is not %NULL, searches continue from next device.
492 const struct dmi_device * dmi_find_device(int type, const char *name,
493 const struct dmi_device *from)
495 const struct list_head *head = from ? &from->list : &dmi_devices;
498 for(d = head->next; d != &dmi_devices; d = d->next) {
499 const struct dmi_device *dev =
500 list_entry(d, struct dmi_device, list);
502 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
503 ((name == NULL) || (strcmp(dev->name, name) == 0)))
509 EXPORT_SYMBOL(dmi_find_device);
512 * dmi_get_year - Return year of a DMI date
513 * @field: data index (like dmi_get_system_info)
515 * Returns -1 when the field doesn't exist. 0 when it is broken.
517 int dmi_get_year(int field)
520 const char *s = dmi_get_system_info(field);
531 year = simple_strtoul(s, NULL, 0);
532 if (year && year < 100) { /* 2-digit year */
534 if (year < 1996) /* no dates < spec 1.0 */
542 * dmi_walk - Walk the DMI table and get called back for every record
543 * @decode: Callback function
545 * Returns -1 when the DMI table can't be reached, 0 on success.
547 int dmi_walk(void (*decode)(const struct dmi_header *))
554 buf = ioremap(dmi_base, dmi_len);
558 dmi_table(buf, dmi_len, dmi_num, decode);
563 EXPORT_SYMBOL_GPL(dmi_walk);