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>
6#include <linux/dmi.h>
7#include <linux/efi.h>
8#include <linux/bootmem.h>
9#include <asm/dmi.h>
10
11
12
13
14
15
16static char dmi_empty_string[] = " ";
17
18
19
20
21static int dmi_initialized;
22
23static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
24{
25 const u8 *bp = ((u8 *) dm) + dm->length;
26
27 if (s) {
28 s--;
29 while (s > 0 && *bp) {
30 bp += strlen(bp) + 1;
31 s--;
32 }
33
34 if (*bp != 0) {
35 size_t len = strlen(bp)+1;
36 size_t cmp_len = len > 8 ? 8 : len;
37
38 if (!memcmp(bp, dmi_empty_string, cmp_len))
39 return dmi_empty_string;
40 return bp;
41 }
42 }
43
44 return "";
45}
46
47static char * __init dmi_string(const struct dmi_header *dm, u8 s)
48{
49 const char *bp = dmi_string_nosave(dm, s);
50 char *str;
51 size_t len;
52
53 if (bp == dmi_empty_string)
54 return dmi_empty_string;
55
56 len = strlen(bp) + 1;
57 str = dmi_alloc(len);
58 if (str != NULL)
59 strcpy(str, bp);
60 else
61 printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
62
63 return str;
64}
65
66
67
68
69
70static void dmi_table(u8 *buf, int len, int num,
71 void (*decode)(const struct dmi_header *, void *),
72 void *private_data)
73{
74 u8 *data = buf;
75 int i = 0;
76
77
78
79
80
81 while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
82 const struct dmi_header *dm = (const struct dmi_header *)data;
83
84
85
86
87
88
89 data += dm->length;
90 while ((data - buf < len - 1) && (data[0] || data[1]))
91 data++;
92 if (data - buf < len - 1)
93 decode(dm, private_data);
94 data += 2;
95 i++;
96 }
97}
98
99static u32 dmi_base;
100static u16 dmi_len;
101static u16 dmi_num;
102
103static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
104 void *))
105{
106 u8 *buf;
107
108 buf = dmi_ioremap(dmi_base, dmi_len);
109 if (buf == NULL)
110 return -1;
111
112 dmi_table(buf, dmi_len, dmi_num, decode, NULL);
113
114 dmi_iounmap(buf, dmi_len);
115 return 0;
116}
117
118static int __init dmi_checksum(const u8 *buf)
119{
120 u8 sum = 0;
121 int a;
122
123 for (a = 0; a < 15; a++)
124 sum += buf[a];
125
126 return sum == 0;
127}
128
129static char *dmi_ident[DMI_STRING_MAX];
130static LIST_HEAD(dmi_devices);
131int dmi_available;
132
133
134
135
136static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
137{
138 const char *d = (const char*) dm;
139 char *p;
140
141 if (dmi_ident[slot])
142 return;
143
144 p = dmi_string(dm, d[string]);
145 if (p == NULL)
146 return;
147
148 dmi_ident[slot] = p;
149}
150
151static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
152{
153 const u8 *d = (u8*) dm + index;
154 char *s;
155 int is_ff = 1, is_00 = 1, i;
156
157 if (dmi_ident[slot])
158 return;
159
160 for (i = 0; i < 16 && (is_ff || is_00); i++) {
161 if(d[i] != 0x00) is_ff = 0;
162 if(d[i] != 0xFF) is_00 = 0;
163 }
164
165 if (is_ff || is_00)
166 return;
167
168 s = dmi_alloc(16*2+4+1);
169 if (!s)
170 return;
171
172 sprintf(s, "%pUB", d);
173
174 dmi_ident[slot] = s;
175}
176
177static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
178{
179 const u8 *d = (u8*) dm + index;
180 char *s;
181
182 if (dmi_ident[slot])
183 return;
184
185 s = dmi_alloc(4);
186 if (!s)
187 return;
188
189 sprintf(s, "%u", *d & 0x7F);
190 dmi_ident[slot] = s;
191}
192
193static void __init dmi_save_one_device(int type, const char *name)
194{
195 struct dmi_device *dev;
196
197
198 if (dmi_find_device(type, name, NULL))
199 return;
200
201 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
202 if (!dev) {
203 printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
204 return;
205 }
206
207 dev->type = type;
208 strcpy((char *)(dev + 1), name);
209 dev->name = (char *)(dev + 1);
210 dev->device_data = NULL;
211 list_add(&dev->list, &dmi_devices);
212}
213
214static void __init dmi_save_devices(const struct dmi_header *dm)
215{
216 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
217
218 for (i = 0; i < count; i++) {
219 const char *d = (char *)(dm + 1) + (i * 2);
220
221
222 if ((*d & 0x80) == 0)
223 continue;
224
225 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
226 }
227}
228
229static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
230{
231 int i, count = *(u8 *)(dm + 1);
232 struct dmi_device *dev;
233
234 for (i = 1; i <= count; i++) {
235 char *devname = dmi_string(dm, i);
236
237 if (devname == dmi_empty_string)
238 continue;
239
240 dev = dmi_alloc(sizeof(*dev));
241 if (!dev) {
242 printk(KERN_ERR
243 "dmi_save_oem_strings_devices: out of memory.\n");
244 break;
245 }
246
247 dev->type = DMI_DEV_TYPE_OEM_STRING;
248 dev->name = devname;
249 dev->device_data = NULL;
250
251 list_add(&dev->list, &dmi_devices);
252 }
253}
254
255static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
256{
257 struct dmi_device *dev;
258 void * data;
259
260 data = dmi_alloc(dm->length);
261 if (data == NULL) {
262 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
263 return;
264 }
265
266 memcpy(data, dm, dm->length);
267
268 dev = dmi_alloc(sizeof(*dev));
269 if (!dev) {
270 printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
271 return;
272 }
273
274 dev->type = DMI_DEV_TYPE_IPMI;
275 dev->name = "IPMI controller";
276 dev->device_data = data;
277
278 list_add_tail(&dev->list, &dmi_devices);
279}
280
281static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
282 int devfn, const char *name)
283{
284 struct dmi_dev_onboard *onboard_dev;
285
286 onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
287 if (!onboard_dev) {
288 printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
289 return;
290 }
291 onboard_dev->instance = instance;
292 onboard_dev->segment = segment;
293 onboard_dev->bus = bus;
294 onboard_dev->devfn = devfn;
295
296 strcpy((char *)&onboard_dev[1], name);
297 onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
298 onboard_dev->dev.name = (char *)&onboard_dev[1];
299 onboard_dev->dev.device_data = onboard_dev;
300
301 list_add(&onboard_dev->dev.list, &dmi_devices);
302}
303
304static void __init dmi_save_extended_devices(const struct dmi_header *dm)
305{
306 const u8 *d = (u8*) dm + 5;
307
308
309 if ((*d & 0x80) == 0)
310 return;
311
312 dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
313 dmi_string_nosave(dm, *(d-1)));
314 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
315}
316
317
318
319
320
321
322static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
323{
324 switch(dm->type) {
325 case 0:
326 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
327 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
328 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
329 break;
330 case 1:
331 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
332 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
333 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
334 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
335 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
336 break;
337 case 2:
338 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
339 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
340 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
341 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
342 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
343 break;
344 case 3:
345 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
346 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
347 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
348 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
349 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
350 break;
351 case 10:
352 dmi_save_devices(dm);
353 break;
354 case 11:
355 dmi_save_oem_strings_devices(dm);
356 break;
357 case 38:
358 dmi_save_ipmi_device(dm);
359 break;
360 case 41:
361 dmi_save_extended_devices(dm);
362 }
363}
364
365static void __init print_filtered(const char *info)
366{
367 const char *p;
368
369 if (!info)
370 return;
371
372 for (p = info; *p; p++)
373 if (isprint(*p))
374 printk(KERN_CONT "%c", *p);
375 else
376 printk(KERN_CONT "\\x%02x", *p & 0xff);
377}
378
379static void __init dmi_dump_ids(void)
380{
381 const char *board;
382
383 printk(KERN_DEBUG "DMI: ");
384 print_filtered(dmi_get_system_info(DMI_SYS_VENDOR));
385 printk(KERN_CONT " ");
386 print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME));
387 board = dmi_get_system_info(DMI_BOARD_NAME);
388 if (board) {
389 printk(KERN_CONT "/");
390 print_filtered(board);
391 }
392 printk(KERN_CONT ", BIOS ");
393 print_filtered(dmi_get_system_info(DMI_BIOS_VERSION));
394 printk(KERN_CONT " ");
395 print_filtered(dmi_get_system_info(DMI_BIOS_DATE));
396 printk(KERN_CONT "\n");
397}
398
399static int __init dmi_present(const char __iomem *p)
400{
401 u8 buf[15];
402
403 memcpy_fromio(buf, p, 15);
404 if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
405 dmi_num = (buf[13] << 8) | buf[12];
406 dmi_len = (buf[7] << 8) | buf[6];
407 dmi_base = (buf[11] << 24) | (buf[10] << 16) |
408 (buf[9] << 8) | buf[8];
409
410
411
412
413
414 if (buf[14] != 0)
415 printk(KERN_INFO "DMI %d.%d present.\n",
416 buf[14] >> 4, buf[14] & 0xF);
417 else
418 printk(KERN_INFO "DMI present.\n");
419 if (dmi_walk_early(dmi_decode) == 0) {
420 dmi_dump_ids();
421 return 0;
422 }
423 }
424 return 1;
425}
426
427void __init dmi_scan_machine(void)
428{
429 char __iomem *p, *q;
430 int rc;
431
432 if (efi_enabled) {
433 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
434 goto error;
435
436
437
438
439
440 p = dmi_ioremap(efi.smbios, 32);
441 if (p == NULL)
442 goto error;
443
444 rc = dmi_present(p + 0x10);
445 dmi_iounmap(p, 32);
446 if (!rc) {
447 dmi_available = 1;
448 goto out;
449 }
450 }
451 else {
452
453
454
455
456
457 p = dmi_ioremap(0xF0000, 0x10000);
458 if (p == NULL)
459 goto error;
460
461 for (q = p; q < p + 0x10000; q += 16) {
462 rc = dmi_present(q);
463 if (!rc) {
464 dmi_available = 1;
465 dmi_iounmap(p, 0x10000);
466 goto out;
467 }
468 }
469 dmi_iounmap(p, 0x10000);
470 }
471 error:
472 printk(KERN_INFO "DMI not present or invalid.\n");
473 out:
474 dmi_initialized = 1;
475}
476
477
478
479
480
481static bool dmi_matches(const struct dmi_system_id *dmi)
482{
483 int i;
484
485 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
486
487 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
488 int s = dmi->matches[i].slot;
489 if (s == DMI_NONE)
490 break;
491 if (dmi_ident[s]
492 && strstr(dmi_ident[s], dmi->matches[i].substr))
493 continue;
494
495 return false;
496 }
497 return true;
498}
499
500
501
502
503
504static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
505{
506 return dmi->matches[0].slot == DMI_NONE;
507}
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522int dmi_check_system(const struct dmi_system_id *list)
523{
524 int count = 0;
525 const struct dmi_system_id *d;
526
527 for (d = list; !dmi_is_end_of_table(d); d++)
528 if (dmi_matches(d)) {
529 count++;
530 if (d->callback && d->callback(d))
531 break;
532 }
533
534 return count;
535}
536EXPORT_SYMBOL(dmi_check_system);
537
538
539
540
541
542
543
544
545
546
547
548
549
550const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
551{
552 const struct dmi_system_id *d;
553
554 for (d = list; !dmi_is_end_of_table(d); d++)
555 if (dmi_matches(d))
556 return d;
557
558 return NULL;
559}
560EXPORT_SYMBOL(dmi_first_match);
561
562
563
564
565
566
567
568
569const char *dmi_get_system_info(int field)
570{
571 return dmi_ident[field];
572}
573EXPORT_SYMBOL(dmi_get_system_info);
574
575
576
577
578
579int dmi_name_in_serial(const char *str)
580{
581 int f = DMI_PRODUCT_SERIAL;
582 if (dmi_ident[f] && strstr(dmi_ident[f], str))
583 return 1;
584 return 0;
585}
586
587
588
589
590
591int dmi_name_in_vendors(const char *str)
592{
593 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
594 int i;
595 for (i = 0; fields[i] != DMI_NONE; i++) {
596 int f = fields[i];
597 if (dmi_ident[f] && strstr(dmi_ident[f], str))
598 return 1;
599 }
600 return 0;
601}
602EXPORT_SYMBOL(dmi_name_in_vendors);
603
604
605
606
607
608
609
610
611
612
613
614
615
616const struct dmi_device * dmi_find_device(int type, const char *name,
617 const struct dmi_device *from)
618{
619 const struct list_head *head = from ? &from->list : &dmi_devices;
620 struct list_head *d;
621
622 for(d = head->next; d != &dmi_devices; d = d->next) {
623 const struct dmi_device *dev =
624 list_entry(d, struct dmi_device, list);
625
626 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
627 ((name == NULL) || (strcmp(dev->name, name) == 0)))
628 return dev;
629 }
630
631 return NULL;
632}
633EXPORT_SYMBOL(dmi_find_device);
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
654{
655 int year = 0, month = 0, day = 0;
656 bool exists;
657 const char *s, *y;
658 char *e;
659
660 s = dmi_get_system_info(field);
661 exists = s;
662 if (!exists)
663 goto out;
664
665
666
667
668
669
670
671 y = strrchr(s, '/');
672 if (!y)
673 goto out;
674
675 y++;
676 year = simple_strtoul(y, &e, 10);
677 if (y != e && year < 100) {
678 year += 1900;
679 if (year < 1996)
680 year += 100;
681 }
682 if (year > 9999)
683 year = 0;
684
685
686 month = simple_strtoul(s, &e, 10);
687 if (s == e || *e != '/' || !month || month > 12) {
688 month = 0;
689 goto out;
690 }
691
692 s = e + 1;
693 day = simple_strtoul(s, &e, 10);
694 if (s == y || s == e || *e != '/' || day > 31)
695 day = 0;
696out:
697 if (yearp)
698 *yearp = year;
699 if (monthp)
700 *monthp = month;
701 if (dayp)
702 *dayp = day;
703 return exists;
704}
705EXPORT_SYMBOL(dmi_get_date);
706
707
708
709
710
711
712
713
714int dmi_walk(void (*decode)(const struct dmi_header *, void *),
715 void *private_data)
716{
717 u8 *buf;
718
719 if (!dmi_available)
720 return -1;
721
722 buf = ioremap(dmi_base, dmi_len);
723 if (buf == NULL)
724 return -1;
725
726 dmi_table(buf, dmi_len, dmi_num, decode, private_data);
727
728 iounmap(buf);
729 return 0;
730}
731EXPORT_SYMBOL_GPL(dmi_walk);
732
733
734
735
736
737
738
739
740bool dmi_match(enum dmi_field f, const char *str)
741{
742 const char *info = dmi_get_system_info(f);
743
744 if (info == NULL || str == NULL)
745 return info == str;
746
747 return !strcmp(info, str);
748}
749EXPORT_SYMBOL_GPL(dmi_match);
750