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 <linux/random.h>
10#include <asm/dmi.h>
11#include <asm/unaligned.h>
12
13struct kobject *dmi_kobj;
14EXPORT_SYMBOL_GPL(dmi_kobj);
15
16
17
18
19
20
21static const char dmi_empty_string[] = " ";
22
23static u32 dmi_ver __initdata;
24static u32 dmi_len;
25static u16 dmi_num;
26static u8 smbios_entry_point[32];
27static int smbios_entry_point_size;
28
29
30
31
32static int dmi_initialized;
33
34
35static char dmi_ids_string[128] __initdata;
36
37static struct dmi_memdev_info {
38 const char *device;
39 const char *bank;
40 u16 handle;
41} *dmi_memdev;
42static int dmi_memdev_nr;
43
44static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
45{
46 const u8 *bp = ((u8 *) dm) + dm->length;
47
48 if (s) {
49 s--;
50 while (s > 0 && *bp) {
51 bp += strlen(bp) + 1;
52 s--;
53 }
54
55 if (*bp != 0) {
56 size_t len = strlen(bp)+1;
57 size_t cmp_len = len > 8 ? 8 : len;
58
59 if (!memcmp(bp, dmi_empty_string, cmp_len))
60 return dmi_empty_string;
61 return bp;
62 }
63 }
64
65 return "";
66}
67
68static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
69{
70 const char *bp = dmi_string_nosave(dm, s);
71 char *str;
72 size_t len;
73
74 if (bp == dmi_empty_string)
75 return dmi_empty_string;
76
77 len = strlen(bp) + 1;
78 str = dmi_alloc(len);
79 if (str != NULL)
80 strcpy(str, bp);
81
82 return str;
83}
84
85
86
87
88
89static void dmi_decode_table(u8 *buf,
90 void (*decode)(const struct dmi_header *, void *),
91 void *private_data)
92{
93 u8 *data = buf;
94 int i = 0;
95
96
97
98
99
100
101
102 while ((!dmi_num || i < dmi_num) &&
103 (data - buf + sizeof(struct dmi_header)) <= dmi_len) {
104 const struct dmi_header *dm = (const struct dmi_header *)data;
105
106
107
108
109
110
111 data += dm->length;
112 while ((data - buf < dmi_len - 1) && (data[0] || data[1]))
113 data++;
114 if (data - buf < dmi_len - 1)
115 decode(dm, private_data);
116
117 data += 2;
118 i++;
119
120
121
122
123
124
125
126
127
128 if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
129 break;
130 }
131
132
133 if (dmi_len > data - buf)
134 dmi_len = data - buf;
135}
136
137static phys_addr_t dmi_base;
138
139static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
140 void *))
141{
142 u8 *buf;
143 u32 orig_dmi_len = dmi_len;
144
145 buf = dmi_early_remap(dmi_base, orig_dmi_len);
146 if (buf == NULL)
147 return -1;
148
149 dmi_decode_table(buf, decode, NULL);
150
151 add_device_randomness(buf, dmi_len);
152
153 dmi_early_unmap(buf, orig_dmi_len);
154 return 0;
155}
156
157static int __init dmi_checksum(const u8 *buf, u8 len)
158{
159 u8 sum = 0;
160 int a;
161
162 for (a = 0; a < len; a++)
163 sum += buf[a];
164
165 return sum == 0;
166}
167
168static const char *dmi_ident[DMI_STRING_MAX];
169static LIST_HEAD(dmi_devices);
170int dmi_available;
171
172
173
174
175static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
176 int string)
177{
178 const char *d = (const char *) dm;
179 const char *p;
180
181 if (dmi_ident[slot])
182 return;
183
184 p = dmi_string(dm, d[string]);
185 if (p == NULL)
186 return;
187
188 dmi_ident[slot] = p;
189}
190
191static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
192 int index)
193{
194 const u8 *d = (u8 *) dm + index;
195 char *s;
196 int is_ff = 1, is_00 = 1, i;
197
198 if (dmi_ident[slot])
199 return;
200
201 for (i = 0; i < 16 && (is_ff || is_00); i++) {
202 if (d[i] != 0x00)
203 is_00 = 0;
204 if (d[i] != 0xFF)
205 is_ff = 0;
206 }
207
208 if (is_ff || is_00)
209 return;
210
211 s = dmi_alloc(16*2+4+1);
212 if (!s)
213 return;
214
215
216
217
218
219
220 if (dmi_ver >= 0x020600)
221 sprintf(s, "%pUL", d);
222 else
223 sprintf(s, "%pUB", d);
224
225 dmi_ident[slot] = s;
226}
227
228static void __init dmi_save_type(const struct dmi_header *dm, int slot,
229 int index)
230{
231 const u8 *d = (u8 *) dm + index;
232 char *s;
233
234 if (dmi_ident[slot])
235 return;
236
237 s = dmi_alloc(4);
238 if (!s)
239 return;
240
241 sprintf(s, "%u", *d & 0x7F);
242 dmi_ident[slot] = s;
243}
244
245static void __init dmi_save_one_device(int type, const char *name)
246{
247 struct dmi_device *dev;
248
249
250 if (dmi_find_device(type, name, NULL))
251 return;
252
253 dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
254 if (!dev)
255 return;
256
257 dev->type = type;
258 strcpy((char *)(dev + 1), name);
259 dev->name = (char *)(dev + 1);
260 dev->device_data = NULL;
261 list_add(&dev->list, &dmi_devices);
262}
263
264static void __init dmi_save_devices(const struct dmi_header *dm)
265{
266 int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
267
268 for (i = 0; i < count; i++) {
269 const char *d = (char *)(dm + 1) + (i * 2);
270
271
272 if ((*d & 0x80) == 0)
273 continue;
274
275 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
276 }
277}
278
279static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
280{
281 int i, count = *(u8 *)(dm + 1);
282 struct dmi_device *dev;
283
284 for (i = 1; i <= count; i++) {
285 const char *devname = dmi_string(dm, i);
286
287 if (devname == dmi_empty_string)
288 continue;
289
290 dev = dmi_alloc(sizeof(*dev));
291 if (!dev)
292 break;
293
294 dev->type = DMI_DEV_TYPE_OEM_STRING;
295 dev->name = devname;
296 dev->device_data = NULL;
297
298 list_add(&dev->list, &dmi_devices);
299 }
300}
301
302static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
303{
304 struct dmi_device *dev;
305 void *data;
306
307 data = dmi_alloc(dm->length);
308 if (data == NULL)
309 return;
310
311 memcpy(data, dm, dm->length);
312
313 dev = dmi_alloc(sizeof(*dev));
314 if (!dev)
315 return;
316
317 dev->type = DMI_DEV_TYPE_IPMI;
318 dev->name = "IPMI controller";
319 dev->device_data = data;
320
321 list_add_tail(&dev->list, &dmi_devices);
322}
323
324static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
325 int devfn, const char *name)
326{
327 struct dmi_dev_onboard *onboard_dev;
328
329 onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
330 if (!onboard_dev)
331 return;
332
333 onboard_dev->instance = instance;
334 onboard_dev->segment = segment;
335 onboard_dev->bus = bus;
336 onboard_dev->devfn = devfn;
337
338 strcpy((char *)&onboard_dev[1], name);
339 onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
340 onboard_dev->dev.name = (char *)&onboard_dev[1];
341 onboard_dev->dev.device_data = onboard_dev;
342
343 list_add(&onboard_dev->dev.list, &dmi_devices);
344}
345
346static void __init dmi_save_extended_devices(const struct dmi_header *dm)
347{
348 const u8 *d = (u8 *) dm + 5;
349
350
351 if ((*d & 0x80) == 0)
352 return;
353
354 dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
355 dmi_string_nosave(dm, *(d-1)));
356 dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
357}
358
359static void __init count_mem_devices(const struct dmi_header *dm, void *v)
360{
361 if (dm->type != DMI_ENTRY_MEM_DEVICE)
362 return;
363 dmi_memdev_nr++;
364}
365
366static void __init save_mem_devices(const struct dmi_header *dm, void *v)
367{
368 const char *d = (const char *)dm;
369 static int nr;
370
371 if (dm->type != DMI_ENTRY_MEM_DEVICE)
372 return;
373 if (nr >= dmi_memdev_nr) {
374 pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
375 return;
376 }
377 dmi_memdev[nr].handle = get_unaligned(&dm->handle);
378 dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
379 dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
380 nr++;
381}
382
383void __init dmi_memdev_walk(void)
384{
385 if (!dmi_available)
386 return;
387
388 if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
389 dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
390 if (dmi_memdev)
391 dmi_walk_early(save_mem_devices);
392 }
393}
394
395
396
397
398
399
400static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
401{
402 switch (dm->type) {
403 case 0:
404 dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
405 dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
406 dmi_save_ident(dm, DMI_BIOS_DATE, 8);
407 break;
408 case 1:
409 dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
410 dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
411 dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
412 dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
413 dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
414 break;
415 case 2:
416 dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
417 dmi_save_ident(dm, DMI_BOARD_NAME, 5);
418 dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
419 dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
420 dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
421 break;
422 case 3:
423 dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
424 dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
425 dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
426 dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
427 dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
428 break;
429 case 10:
430 dmi_save_devices(dm);
431 break;
432 case 11:
433 dmi_save_oem_strings_devices(dm);
434 break;
435 case 38:
436 dmi_save_ipmi_device(dm);
437 break;
438 case 41:
439 dmi_save_extended_devices(dm);
440 }
441}
442
443static int __init print_filtered(char *buf, size_t len, const char *info)
444{
445 int c = 0;
446 const char *p;
447
448 if (!info)
449 return c;
450
451 for (p = info; *p; p++)
452 if (isprint(*p))
453 c += scnprintf(buf + c, len - c, "%c", *p);
454 else
455 c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
456 return c;
457}
458
459static void __init dmi_format_ids(char *buf, size_t len)
460{
461 int c = 0;
462 const char *board;
463
464 c += print_filtered(buf + c, len - c,
465 dmi_get_system_info(DMI_SYS_VENDOR));
466 c += scnprintf(buf + c, len - c, " ");
467 c += print_filtered(buf + c, len - c,
468 dmi_get_system_info(DMI_PRODUCT_NAME));
469
470 board = dmi_get_system_info(DMI_BOARD_NAME);
471 if (board) {
472 c += scnprintf(buf + c, len - c, "/");
473 c += print_filtered(buf + c, len - c, board);
474 }
475 c += scnprintf(buf + c, len - c, ", BIOS ");
476 c += print_filtered(buf + c, len - c,
477 dmi_get_system_info(DMI_BIOS_VERSION));
478 c += scnprintf(buf + c, len - c, " ");
479 c += print_filtered(buf + c, len - c,
480 dmi_get_system_info(DMI_BIOS_DATE));
481}
482
483
484
485
486
487
488
489
490static int __init dmi_present(const u8 *buf)
491{
492 u32 smbios_ver;
493
494 if (memcmp(buf, "_SM_", 4) == 0 &&
495 buf[5] < 32 && dmi_checksum(buf, buf[5])) {
496 smbios_ver = get_unaligned_be16(buf + 6);
497 smbios_entry_point_size = buf[5];
498 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
499
500
501 switch (smbios_ver) {
502 case 0x021F:
503 case 0x0221:
504 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n",
505 smbios_ver & 0xFF, 3);
506 smbios_ver = 0x0203;
507 break;
508 case 0x0233:
509 pr_debug("SMBIOS version fixup (2.%d->2.%d)\n", 51, 6);
510 smbios_ver = 0x0206;
511 break;
512 }
513 } else {
514 smbios_ver = 0;
515 }
516
517 buf += 16;
518
519 if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
520 if (smbios_ver)
521 dmi_ver = smbios_ver;
522 else
523 dmi_ver = (buf[14] & 0xF0) << 4 | (buf[14] & 0x0F);
524 dmi_num = get_unaligned_le16(buf + 12);
525 dmi_len = get_unaligned_le16(buf + 6);
526 dmi_base = get_unaligned_le32(buf + 8);
527
528 if (dmi_walk_early(dmi_decode) == 0) {
529 if (smbios_ver) {
530 pr_info("SMBIOS %d.%d present.\n",
531 dmi_ver >> 8, dmi_ver & 0xFF);
532 } else {
533 smbios_entry_point_size = 15;
534 memcpy(smbios_entry_point, buf,
535 smbios_entry_point_size);
536 pr_info("Legacy DMI %d.%d present.\n",
537 dmi_ver >> 8, dmi_ver & 0xFF);
538 }
539 dmi_ver <<= 8;
540 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
541 printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
542 return 0;
543 }
544 }
545
546 return 1;
547}
548
549
550
551
552
553static int __init dmi_smbios3_present(const u8 *buf)
554{
555 if (memcmp(buf, "_SM3_", 5) == 0 &&
556 buf[6] < 32 && dmi_checksum(buf, buf[6])) {
557 dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
558 dmi_num = 0;
559 dmi_len = get_unaligned_le32(buf + 12);
560 dmi_base = get_unaligned_le64(buf + 16);
561 smbios_entry_point_size = buf[6];
562 memcpy(smbios_entry_point, buf, smbios_entry_point_size);
563
564 if (dmi_walk_early(dmi_decode) == 0) {
565 pr_info("SMBIOS %d.%d.%d present.\n",
566 dmi_ver >> 16, (dmi_ver >> 8) & 0xFF,
567 dmi_ver & 0xFF);
568 dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
569 pr_debug("DMI: %s\n", dmi_ids_string);
570 return 0;
571 }
572 }
573 return 1;
574}
575
576void __init dmi_scan_machine(void)
577{
578 char __iomem *p, *q;
579 char buf[32];
580
581 if (efi_enabled(EFI_CONFIG_TABLES)) {
582
583
584
585
586
587
588
589
590
591
592
593
594
595 if (efi.smbios3 != EFI_INVALID_TABLE_ADDR) {
596 p = dmi_early_remap(efi.smbios3, 32);
597 if (p == NULL)
598 goto error;
599 memcpy_fromio(buf, p, 32);
600 dmi_early_unmap(p, 32);
601
602 if (!dmi_smbios3_present(buf)) {
603 dmi_available = 1;
604 goto out;
605 }
606 }
607 if (efi.smbios == EFI_INVALID_TABLE_ADDR)
608 goto error;
609
610
611
612
613
614 p = dmi_early_remap(efi.smbios, 32);
615 if (p == NULL)
616 goto error;
617 memcpy_fromio(buf, p, 32);
618 dmi_early_unmap(p, 32);
619
620 if (!dmi_present(buf)) {
621 dmi_available = 1;
622 goto out;
623 }
624 } else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
625 p = dmi_early_remap(0xF0000, 0x10000);
626 if (p == NULL)
627 goto error;
628
629
630
631
632
633
634
635
636 memset(buf, 0, 16);
637 for (q = p; q < p + 0x10000; q += 16) {
638 memcpy_fromio(buf + 16, q, 16);
639 if (!dmi_smbios3_present(buf) || !dmi_present(buf)) {
640 dmi_available = 1;
641 dmi_early_unmap(p, 0x10000);
642 goto out;
643 }
644 memcpy(buf, buf + 16, 16);
645 }
646 dmi_early_unmap(p, 0x10000);
647 }
648 error:
649 pr_info("DMI not present or invalid.\n");
650 out:
651 dmi_initialized = 1;
652}
653
654static ssize_t raw_table_read(struct file *file, struct kobject *kobj,
655 struct bin_attribute *attr, char *buf,
656 loff_t pos, size_t count)
657{
658 memcpy(buf, attr->private + pos, count);
659 return count;
660}
661
662static BIN_ATTR(smbios_entry_point, S_IRUSR, raw_table_read, NULL, 0);
663static BIN_ATTR(DMI, S_IRUSR, raw_table_read, NULL, 0);
664
665static int __init dmi_init(void)
666{
667 struct kobject *tables_kobj;
668 u8 *dmi_table;
669 int ret = -ENOMEM;
670
671 if (!dmi_available) {
672 ret = -ENODATA;
673 goto err;
674 }
675
676
677
678
679
680
681 dmi_kobj = kobject_create_and_add("dmi", firmware_kobj);
682 if (!dmi_kobj)
683 goto err;
684
685 tables_kobj = kobject_create_and_add("tables", dmi_kobj);
686 if (!tables_kobj)
687 goto err;
688
689 dmi_table = dmi_remap(dmi_base, dmi_len);
690 if (!dmi_table)
691 goto err_tables;
692
693 bin_attr_smbios_entry_point.size = smbios_entry_point_size;
694 bin_attr_smbios_entry_point.private = smbios_entry_point;
695 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_smbios_entry_point);
696 if (ret)
697 goto err_unmap;
698
699 bin_attr_DMI.size = dmi_len;
700 bin_attr_DMI.private = dmi_table;
701 ret = sysfs_create_bin_file(tables_kobj, &bin_attr_DMI);
702 if (!ret)
703 return 0;
704
705 sysfs_remove_bin_file(tables_kobj,
706 &bin_attr_smbios_entry_point);
707 err_unmap:
708 dmi_unmap(dmi_table);
709 err_tables:
710 kobject_del(tables_kobj);
711 kobject_put(tables_kobj);
712 err:
713 pr_err("dmi: Firmware registration failed.\n");
714
715 return ret;
716}
717subsys_initcall(dmi_init);
718
719
720
721
722
723
724
725
726
727void __init dmi_set_dump_stack_arch_desc(void)
728{
729 dump_stack_set_arch_desc("%s", dmi_ids_string);
730}
731
732
733
734
735
736static bool dmi_matches(const struct dmi_system_id *dmi)
737{
738 int i;
739
740 WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
741
742 for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
743 int s = dmi->matches[i].slot;
744 if (s == DMI_NONE)
745 break;
746 if (dmi_ident[s]) {
747 if (!dmi->matches[i].exact_match &&
748 strstr(dmi_ident[s], dmi->matches[i].substr))
749 continue;
750 else if (dmi->matches[i].exact_match &&
751 !strcmp(dmi_ident[s], dmi->matches[i].substr))
752 continue;
753 }
754
755
756 return false;
757 }
758 return true;
759}
760
761
762
763
764
765static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
766{
767 return dmi->matches[0].slot == DMI_NONE;
768}
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783int dmi_check_system(const struct dmi_system_id *list)
784{
785 int count = 0;
786 const struct dmi_system_id *d;
787
788 for (d = list; !dmi_is_end_of_table(d); d++)
789 if (dmi_matches(d)) {
790 count++;
791 if (d->callback && d->callback(d))
792 break;
793 }
794
795 return count;
796}
797EXPORT_SYMBOL(dmi_check_system);
798
799
800
801
802
803
804
805
806
807
808
809
810
811const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
812{
813 const struct dmi_system_id *d;
814
815 for (d = list; !dmi_is_end_of_table(d); d++)
816 if (dmi_matches(d))
817 return d;
818
819 return NULL;
820}
821EXPORT_SYMBOL(dmi_first_match);
822
823
824
825
826
827
828
829
830const char *dmi_get_system_info(int field)
831{
832 return dmi_ident[field];
833}
834EXPORT_SYMBOL(dmi_get_system_info);
835
836
837
838
839
840int dmi_name_in_serial(const char *str)
841{
842 int f = DMI_PRODUCT_SERIAL;
843 if (dmi_ident[f] && strstr(dmi_ident[f], str))
844 return 1;
845 return 0;
846}
847
848
849
850
851
852int dmi_name_in_vendors(const char *str)
853{
854 static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
855 int i;
856 for (i = 0; fields[i] != DMI_NONE; i++) {
857 int f = fields[i];
858 if (dmi_ident[f] && strstr(dmi_ident[f], str))
859 return 1;
860 }
861 return 0;
862}
863EXPORT_SYMBOL(dmi_name_in_vendors);
864
865
866
867
868
869
870
871
872
873
874
875
876
877const struct dmi_device *dmi_find_device(int type, const char *name,
878 const struct dmi_device *from)
879{
880 const struct list_head *head = from ? &from->list : &dmi_devices;
881 struct list_head *d;
882
883 for (d = head->next; d != &dmi_devices; d = d->next) {
884 const struct dmi_device *dev =
885 list_entry(d, struct dmi_device, list);
886
887 if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
888 ((name == NULL) || (strcmp(dev->name, name) == 0)))
889 return dev;
890 }
891
892 return NULL;
893}
894EXPORT_SYMBOL(dmi_find_device);
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
915{
916 int year = 0, month = 0, day = 0;
917 bool exists;
918 const char *s, *y;
919 char *e;
920
921 s = dmi_get_system_info(field);
922 exists = s;
923 if (!exists)
924 goto out;
925
926
927
928
929
930
931
932 y = strrchr(s, '/');
933 if (!y)
934 goto out;
935
936 y++;
937 year = simple_strtoul(y, &e, 10);
938 if (y != e && year < 100) {
939 year += 1900;
940 if (year < 1996)
941 year += 100;
942 }
943 if (year > 9999)
944 year = 0;
945
946
947 month = simple_strtoul(s, &e, 10);
948 if (s == e || *e != '/' || !month || month > 12) {
949 month = 0;
950 goto out;
951 }
952
953 s = e + 1;
954 day = simple_strtoul(s, &e, 10);
955 if (s == y || s == e || *e != '/' || day > 31)
956 day = 0;
957out:
958 if (yearp)
959 *yearp = year;
960 if (monthp)
961 *monthp = month;
962 if (dayp)
963 *dayp = day;
964 return exists;
965}
966EXPORT_SYMBOL(dmi_get_date);
967
968
969
970
971
972
973
974
975int dmi_walk(void (*decode)(const struct dmi_header *, void *),
976 void *private_data)
977{
978 u8 *buf;
979
980 if (!dmi_available)
981 return -1;
982
983 buf = dmi_remap(dmi_base, dmi_len);
984 if (buf == NULL)
985 return -1;
986
987 dmi_decode_table(buf, decode, private_data);
988
989 dmi_unmap(buf);
990 return 0;
991}
992EXPORT_SYMBOL_GPL(dmi_walk);
993
994
995
996
997
998
999
1000
1001bool dmi_match(enum dmi_field f, const char *str)
1002{
1003 const char *info = dmi_get_system_info(f);
1004
1005 if (info == NULL || str == NULL)
1006 return info == str;
1007
1008 return !strcmp(info, str);
1009}
1010EXPORT_SYMBOL_GPL(dmi_match);
1011
1012void dmi_memdev_name(u16 handle, const char **bank, const char **device)
1013{
1014 int n;
1015
1016 if (dmi_memdev == NULL)
1017 return;
1018
1019 for (n = 0; n < dmi_memdev_nr; n++) {
1020 if (handle == dmi_memdev[n].handle) {
1021 *bank = dmi_memdev[n].bank;
1022 *device = dmi_memdev[n].device;
1023 break;
1024 }
1025 }
1026}
1027EXPORT_SYMBOL_GPL(dmi_memdev_name);
1028