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>
11 static char dmi_empty_string[] = " ";
13 static char * __init dmi_string(const struct dmi_header *dm, u8 s)
15 const u8 *bp = ((u8 *) dm) + dm->length;
20 while (s > 0 && *bp) {
26 size_t len = strlen(bp)+1;
27 size_t cmp_len = len > 8 ? 8 : len;
29 if (!memcmp(bp, dmi_empty_string, cmp_len))
30 return dmi_empty_string;
35 printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
43 * We have to be cautious here. We have seen BIOSes with DMI pointers
44 * pointing to completely the wrong place for example
46 static void dmi_table(u8 *buf, int len, int num,
47 void (*decode)(const struct dmi_header *))
53 * Stop when we see all the items the table claimed to have
54 * OR we run off the end of the table (also happens)
56 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
57 const struct dmi_header *dm = (const struct dmi_header *)data;
60 * We want to know the total length (formated area and strings)
61 * before decoding to make sure we won't run off the table in
62 * dmi_decode or dmi_string
65 while ((data - buf < len - 1) && (data[0] || data[1]))
67 if (data - buf < len - 1)
78 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *))
82 buf = dmi_ioremap(dmi_base, dmi_len);
86 dmi_table(buf, dmi_len, dmi_num, decode);
88 dmi_iounmap(buf, dmi_len);
92 static int __init dmi_checksum(const u8 *buf)
97 for (a = 0; a < 15; a++)
103 static char *dmi_ident[DMI_STRING_MAX];
104 static LIST_HEAD(dmi_devices);
110 static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
112 const char *d = (const char*) dm;
118 p = dmi_string(dm, d[string]);
125 static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
127 const u8 *d = (u8*) dm + index;
129 int is_ff = 1, is_00 = 1, i;
134 for (i = 0; i < 16 && (is_ff || is_00); i++) {
135 if(d[i] != 0x00) is_ff = 0;
136 if(d[i] != 0xFF) is_00 = 0;
142 s = dmi_alloc(16*2+4+1);
147 "%02X%02X%02X%02X-%02X%02X-%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X",
148 d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7],
149 d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
154 static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
156 const u8 *d = (u8*) dm + index;
166 sprintf(s, "%u", *d & 0x7F);
170 static void __init dmi_save_devices(const struct dmi_header *dm)
172 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
173 struct dmi_device *dev;
175 for (i = 0; i < count; i++) {
176 const char *d = (char *)(dm + 1) + (i * 2);
178 /* Skip disabled device */
179 if ((*d & 0x80) == 0)
182 dev = dmi_alloc(sizeof(*dev));
184 printk(KERN_ERR "dmi_save_devices: out of memory.\n");
188 dev->type = *d++ & 0x7f;
189 dev->name = dmi_string(dm, *d);
190 dev->device_data = NULL;
191 list_add(&dev->list, &dmi_devices);
195 static struct dmi_device empty_oem_string_dev = {
196 .name = dmi_empty_string,
199 static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
201 int i, count = *(u8 *)(dm + 1);
202 struct dmi_device *dev;
204 for (i = 1; i <= count; i++) {
205 char *devname = dmi_string(dm, i);
207 if (!strcmp(devname, dmi_empty_string)) {
208 list_add(&empty_oem_string_dev.list, &dmi_devices);
212 dev = dmi_alloc(sizeof(*dev));
215 "dmi_save_oem_strings_devices: out of memory.\n");
219 dev->type = DMI_DEV_TYPE_OEM_STRING;
221 dev->device_data = NULL;
223 list_add(&dev->list, &dmi_devices);
227 static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
229 struct dmi_device *dev;
232 data = dmi_alloc(dm->length);
234 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
238 memcpy(data, dm, dm->length);
240 dev = dmi_alloc(sizeof(*dev));
242 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
246 dev->type = DMI_DEV_TYPE_IPMI;
247 dev->name = "IPMI controller";
248 dev->device_data = data;
250 list_add(&dev->list, &dmi_devices);
253 static void __init dmi_save_extended_devices(const struct dmi_header *dm)
255 const u8 *d = (u8*) dm + 5;
256 struct dmi_device *dev;
258 /* Skip disabled device */
259 if ((*d & 0x80) == 0)
262 dev = dmi_alloc(sizeof(*dev));
264 printk(KERN_ERR "dmi_save_extended_devices: out of memory.\n");
268 dev->type = *d-- & 0x7f;
269 dev->name = dmi_string(dm, *d);
270 dev->device_data = NULL;
272 list_add(&dev->list, &dmi_devices);
276 * Process a DMI table entry. Right now all we care about are the BIOS
277 * and machine entries. For 2.5 we should pull the smbus controller info
280 static void __init dmi_decode(const struct dmi_header *dm)
283 case 0: /* BIOS Information */
284 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
285 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
286 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
288 case 1: /* System Information */
289 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
290 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
291 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
292 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
293 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
295 case 2: /* Base Board Information */
296 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
297 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
298 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
299 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
300 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
302 case 3: /* Chassis Information */
303 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
304 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
305 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
306 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
307 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
309 case 10: /* Onboard Devices Information */
310 dmi_save_devices(dm);
312 case 11: /* OEM Strings */
313 dmi_save_oem_strings_devices(dm);
315 case 38: /* IPMI Device Information */
316 dmi_save_ipmi_device(dm);
318 case 41: /* Onboard Devices Extended Information */
319 dmi_save_extended_devices(dm);
323 static int __init dmi_present(const char __iomem *p)
327 memcpy_fromio(buf, p, 15);
328 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
329 dmi_num = (buf[13] << 8) | buf[12];
330 dmi_len = (buf[7] << 8) | buf[6];
331 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
332 (buf[9] << 8) | buf[8];
335 * DMI version 0.0 means that the real version is taken from
336 * the SMBIOS version, which we don't know at this point.
339 printk(KERN_INFO "DMI %d.%d present.\n",
340 buf[14] >> 4, buf[14] & 0xF);
342 printk(KERN_INFO "DMI present.\n");
343 if (dmi_walk_early(dmi_decode) == 0)
349 void __init dmi_scan_machine(void)
355 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
358 /* This is called as a core_initcall() because it isn't
359 * needed during early boot. This also means we can
360 * iounmap the space when we're done with it.
362 p = dmi_ioremap(efi.smbios, 32);
366 rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
375 * no iounmap() for that ioremap(); it would be a no-op, but
376 * it's so early in setup that sucker gets confused into doing
377 * what it shouldn't if we actually call it.
379 p = dmi_ioremap(0xF0000, 0x10000);
383 for (q = p; q < p + 0x10000; q += 16) {
387 dmi_iounmap(p, 0x10000);
391 dmi_iounmap(p, 0x10000);
393 out: printk(KERN_INFO "DMI not present or invalid.\n");
397 * dmi_check_system - check system DMI data
398 * @list: array of dmi_system_id structures to match against
399 * All non-null elements of the list must match
400 * their slot's (field index's) data (i.e., each
401 * list string must be a substring of the specified
402 * DMI slot's string data) to be considered a
405 * Walk the blacklist table running matching functions until someone
406 * returns non zero or we hit the end. Callback function is called for
407 * each successful match. Returns the number of matches.
409 int dmi_check_system(const struct dmi_system_id *list)
412 const struct dmi_system_id *d = list;
415 for (i = 0; i < ARRAY_SIZE(d->matches); i++) {
416 int s = d->matches[i].slot;
419 if (dmi_ident[s] && strstr(dmi_ident[s], d->matches[i].substr))
425 if (d->callback && d->callback(d))
432 EXPORT_SYMBOL(dmi_check_system);
435 * dmi_get_system_info - return DMI data value
436 * @field: data index (see enum dmi_field)
438 * Returns one DMI data value, can be used to perform
439 * complex DMI data checks.
441 const char *dmi_get_system_info(int field)
443 return dmi_ident[field];
445 EXPORT_SYMBOL(dmi_get_system_info);
449 * dmi_name_in_vendors - Check if string is anywhere in the DMI vendor information.
450 * @str: Case sensitive Name
452 int dmi_name_in_vendors(const char *str)
454 static int fields[] = { DMI_BIOS_VENDOR, DMI_BIOS_VERSION, DMI_SYS_VENDOR,
455 DMI_PRODUCT_NAME, DMI_PRODUCT_VERSION, DMI_BOARD_VENDOR,
456 DMI_BOARD_NAME, DMI_BOARD_VERSION, DMI_NONE };
458 for (i = 0; fields[i] != DMI_NONE; i++) {
460 if (dmi_ident[f] && strstr(dmi_ident[f], str))
465 EXPORT_SYMBOL(dmi_name_in_vendors);
468 * dmi_find_device - find onboard device by type/name
469 * @type: device type or %DMI_DEV_TYPE_ANY to match all device types
470 * @name: device name string or %NULL to match all
471 * @from: previous device found in search, or %NULL for new search.
473 * Iterates through the list of known onboard devices. If a device is
474 * found with a matching @vendor and @device, a pointer to its device
475 * structure is returned. Otherwise, %NULL is returned.
476 * A new search is initiated by passing %NULL as the @from argument.
477 * If @from is not %NULL, searches continue from next device.
479 const struct dmi_device * dmi_find_device(int type, const char *name,
480 const struct dmi_device *from)
482 const struct list_head *head = from ? &from->list : &dmi_devices;
485 for(d = head->next; d != &dmi_devices; d = d->next) {
486 const struct dmi_device *dev =
487 list_entry(d, struct dmi_device, list);
489 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
490 ((name == NULL) || (strcmp(dev->name, name) == 0)))
496 EXPORT_SYMBOL(dmi_find_device);
499 * dmi_get_year - Return year of a DMI date
500 * @field: data index (like dmi_get_system_info)
502 * Returns -1 when the field doesn't exist. 0 when it is broken.
504 int dmi_get_year(int field)
507 const char *s = dmi_get_system_info(field);
518 year = simple_strtoul(s, NULL, 0);
519 if (year && year < 100) { /* 2-digit year */
521 if (year < 1996) /* no dates < spec 1.0 */
529 * dmi_walk - Walk the DMI table and get called back for every record
530 * @decode: Callback function
532 * Returns -1 when the DMI table can't be reached, 0 on success.
534 int dmi_walk(void (*decode)(const struct dmi_header *))
541 buf = ioremap(dmi_base, dmi_len);
545 dmi_table(buf, dmi_len, dmi_num, decode);
550 EXPORT_SYMBOL_GPL(dmi_walk);