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
 
 
 
 13/*
 14 * DMI stands for "Desktop Management Interface".  It is part
 15 * of and an antecedent to, SMBIOS, which stands for System
 16 * Management BIOS.  See further: http://www.dmtf.org/standards
 17 */
 18static const char dmi_empty_string[] = "        ";
 19
 20static u16 __initdata dmi_ver;
 21/*
 22 * Catch too early calls to dmi_check_system():
 23 */
 24static int dmi_initialized;
 25
 26/* DMI system identification string used during boot */
 27static char dmi_ids_string[128] __initdata;
 28
 29static struct dmi_memdev_info {
 30	const char *device;
 31	const char *bank;
 
 32	u16 handle;
 33} *dmi_memdev;
 34static int dmi_memdev_nr;
 35
 36static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
 37{
 38	const u8 *bp = ((u8 *) dm) + dm->length;
 
 39
 40	if (s) {
 41		s--;
 42		while (s > 0 && *bp) {
 43			bp += strlen(bp) + 1;
 44			s--;
 45		}
 46
 47		if (*bp != 0) {
 48			size_t len = strlen(bp)+1;
 49			size_t cmp_len = len > 8 ? 8 : len;
 50
 51			if (!memcmp(bp, dmi_empty_string, cmp_len))
 52				return dmi_empty_string;
 
 
 
 53			return bp;
 54		}
 55	}
 56
 57	return "";
 58}
 59
 60static const char * __init dmi_string(const struct dmi_header *dm, u8 s)
 61{
 62	const char *bp = dmi_string_nosave(dm, s);
 63	char *str;
 64	size_t len;
 65
 66	if (bp == dmi_empty_string)
 67		return dmi_empty_string;
 68
 69	len = strlen(bp) + 1;
 70	str = dmi_alloc(len);
 71	if (str != NULL)
 72		strcpy(str, bp);
 73
 74	return str;
 75}
 76
 77/*
 78 *	We have to be cautious here. We have seen BIOSes with DMI pointers
 79 *	pointing to completely the wrong place for example
 80 */
 81static void dmi_table(u8 *buf, int len, int num,
 82		      void (*decode)(const struct dmi_header *, void *),
 83		      void *private_data)
 84{
 85	u8 *data = buf;
 86	int i = 0;
 87
 88	/*
 89	 *	Stop when we see all the items the table claimed to have
 90	 *	OR we run off the end of the table (also happens)
 
 
 91	 */
 92	while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
 
 93		const struct dmi_header *dm = (const struct dmi_header *)data;
 94
 95		/*
 96		 *  We want to know the total length (formatted area and
 97		 *  strings) before decoding to make sure we won't run off the
 98		 *  table in dmi_decode or dmi_string
 99		 */
100		data += dm->length;
101		while ((data - buf < len - 1) && (data[0] || data[1]))
102			data++;
103		if (data - buf < len - 1)
104			decode(dm, private_data);
 
105		data += 2;
106		i++;
 
 
 
 
 
 
 
 
 
 
 
107	}
 
 
 
 
108}
109
110static u32 dmi_base;
111static u16 dmi_len;
112static u16 dmi_num;
113
114static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
115		void *))
116{
117	u8 *buf;
 
118
119	buf = dmi_early_remap(dmi_base, dmi_len);
120	if (buf == NULL)
121		return -1;
122
123	dmi_table(buf, dmi_len, dmi_num, decode, NULL);
124
125	add_device_randomness(buf, dmi_len);
126
127	dmi_early_unmap(buf, dmi_len);
128	return 0;
129}
130
131static int __init dmi_checksum(const u8 *buf, u8 len)
132{
133	u8 sum = 0;
134	int a;
135
136	for (a = 0; a < len; a++)
137		sum += buf[a];
138
139	return sum == 0;
140}
141
142static const char *dmi_ident[DMI_STRING_MAX];
143static LIST_HEAD(dmi_devices);
144int dmi_available;
145
146/*
147 *	Save a DMI string
148 */
149static void __init dmi_save_ident(const struct dmi_header *dm, int slot,
150		int string)
151{
152	const char *d = (const char *) dm;
153	const char *p;
154
155	if (dmi_ident[slot])
156		return;
157
158	p = dmi_string(dm, d[string]);
159	if (p == NULL)
160		return;
161
162	dmi_ident[slot] = p;
163}
164
165static void __init dmi_save_uuid(const struct dmi_header *dm, int slot,
166		int index)
167{
168	const u8 *d = (u8 *) dm + index;
169	char *s;
170	int is_ff = 1, is_00 = 1, i;
171
172	if (dmi_ident[slot])
173		return;
174
 
175	for (i = 0; i < 16 && (is_ff || is_00); i++) {
176		if (d[i] != 0x00)
177			is_00 = 0;
178		if (d[i] != 0xFF)
179			is_ff = 0;
180	}
181
182	if (is_ff || is_00)
183		return;
184
185	s = dmi_alloc(16*2+4+1);
186	if (!s)
187		return;
188
189	/*
190	 * As of version 2.6 of the SMBIOS specification, the first 3 fields of
191	 * the UUID are supposed to be little-endian encoded.  The specification
192	 * says that this is the defacto standard.
193	 */
194	if (dmi_ver >= 0x0206)
195		sprintf(s, "%pUL", d);
196	else
197		sprintf(s, "%pUB", d);
198
199	dmi_ident[slot] = s;
200}
201
202static void __init dmi_save_type(const struct dmi_header *dm, int slot,
203		int index)
204{
205	const u8 *d = (u8 *) dm + index;
206	char *s;
207
208	if (dmi_ident[slot])
209		return;
210
211	s = dmi_alloc(4);
212	if (!s)
213		return;
214
 
215	sprintf(s, "%u", *d & 0x7F);
216	dmi_ident[slot] = s;
217}
218
219static void __init dmi_save_one_device(int type, const char *name)
220{
221	struct dmi_device *dev;
222
223	/* No duplicate device */
224	if (dmi_find_device(type, name, NULL))
225		return;
226
227	dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
228	if (!dev)
229		return;
230
231	dev->type = type;
232	strcpy((char *)(dev + 1), name);
233	dev->name = (char *)(dev + 1);
234	dev->device_data = NULL;
235	list_add(&dev->list, &dmi_devices);
236}
237
238static void __init dmi_save_devices(const struct dmi_header *dm)
239{
240	int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
241
242	for (i = 0; i < count; i++) {
243		const char *d = (char *)(dm + 1) + (i * 2);
244
245		/* Skip disabled device */
246		if ((*d & 0x80) == 0)
247			continue;
248
249		dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
250	}
251}
252
253static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
254{
255	int i, count = *(u8 *)(dm + 1);
256	struct dmi_device *dev;
257
 
 
 
 
258	for (i = 1; i <= count; i++) {
259		const char *devname = dmi_string(dm, i);
260
261		if (devname == dmi_empty_string)
262			continue;
263
264		dev = dmi_alloc(sizeof(*dev));
265		if (!dev)
266			break;
267
268		dev->type = DMI_DEV_TYPE_OEM_STRING;
269		dev->name = devname;
270		dev->device_data = NULL;
271
272		list_add(&dev->list, &dmi_devices);
273	}
274}
275
276static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
277{
278	struct dmi_device *dev;
279	void *data;
280
281	data = dmi_alloc(dm->length);
282	if (data == NULL)
283		return;
284
285	memcpy(data, dm, dm->length);
286
287	dev = dmi_alloc(sizeof(*dev));
288	if (!dev)
289		return;
290
291	dev->type = DMI_DEV_TYPE_IPMI;
292	dev->name = "IPMI controller";
293	dev->device_data = data;
294
295	list_add_tail(&dev->list, &dmi_devices);
296}
297
298static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
299					int devfn, const char *name)
300{
301	struct dmi_dev_onboard *onboard_dev;
302
303	onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
304	if (!onboard_dev)
 
305		return;
306
307	onboard_dev->instance = instance;
308	onboard_dev->segment = segment;
309	onboard_dev->bus = bus;
310	onboard_dev->devfn = devfn;
311
312	strcpy((char *)&onboard_dev[1], name);
313	onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
314	onboard_dev->dev.name = (char *)&onboard_dev[1];
315	onboard_dev->dev.device_data = onboard_dev;
 
 
 
 
 
316
317	list_add(&onboard_dev->dev.list, &dmi_devices);
318}
319
320static void __init dmi_save_extended_devices(const struct dmi_header *dm)
321{
322	const u8 *d = (u8 *) dm + 5;
 
 
 
 
323
324	/* Skip disabled device */
325	if ((*d & 0x80) == 0)
326		return;
327
328	dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
329			     dmi_string_nosave(dm, *(d-1)));
330	dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
 
 
 
 
 
 
 
 
 
 
 
 
 
331}
332
333static void __init count_mem_devices(const struct dmi_header *dm, void *v)
334{
335	if (dm->type != DMI_ENTRY_MEM_DEVICE)
336		return;
337	dmi_memdev_nr++;
338}
339
340static void __init save_mem_devices(const struct dmi_header *dm, void *v)
341{
342	const char *d = (const char *)dm;
343	static int nr;
 
 
344
345	if (dm->type != DMI_ENTRY_MEM_DEVICE)
346		return;
347	if (nr >= dmi_memdev_nr) {
348		pr_warn(FW_BUG "Too many DIMM entries in SMBIOS table\n");
349		return;
350	}
351	dmi_memdev[nr].handle = get_unaligned(&dm->handle);
352	dmi_memdev[nr].device = dmi_string(dm, d[0x10]);
353	dmi_memdev[nr].bank = dmi_string(dm, d[0x11]);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
354	nr++;
355}
356
357void __init dmi_memdev_walk(void)
358{
359	if (!dmi_available)
360		return;
361
362	if (dmi_walk_early(count_mem_devices) == 0 && dmi_memdev_nr) {
363		dmi_memdev = dmi_alloc(sizeof(*dmi_memdev) * dmi_memdev_nr);
364		if (dmi_memdev)
365			dmi_walk_early(save_mem_devices);
366	}
367}
368
369/*
370 *	Process a DMI table entry. Right now all we care about are the BIOS
371 *	and machine entries. For 2.5 we should pull the smbus controller info
372 *	out of here.
373 */
374static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
375{
376	switch (dm->type) {
377	case 0:		/* BIOS Information */
378		dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
379		dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
380		dmi_save_ident(dm, DMI_BIOS_DATE, 8);
381		break;
382	case 1:		/* System Information */
383		dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
384		dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
385		dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
386		dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
387		dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
 
388		break;
389	case 2:		/* Base Board Information */
390		dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
391		dmi_save_ident(dm, DMI_BOARD_NAME, 5);
392		dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
393		dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
394		dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
395		break;
396	case 3:		/* Chassis Information */
397		dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
398		dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
399		dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
400		dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
401		dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
402		break;
 
 
 
403	case 10:	/* Onboard Devices Information */
404		dmi_save_devices(dm);
405		break;
406	case 11:	/* OEM Strings */
407		dmi_save_oem_strings_devices(dm);
408		break;
409	case 38:	/* IPMI Device Information */
410		dmi_save_ipmi_device(dm);
411		break;
412	case 41:	/* Onboard Devices Extended Information */
413		dmi_save_extended_devices(dm);
414	}
415}
416
417static int __init print_filtered(char *buf, size_t len, const char *info)
418{
419	int c = 0;
420	const char *p;
421
422	if (!info)
423		return c;
424
425	for (p = info; *p; p++)
426		if (isprint(*p))
427			c += scnprintf(buf + c, len - c, "%c", *p);
428		else
429			c += scnprintf(buf + c, len - c, "\\x%02x", *p & 0xff);
430	return c;
431}
432
433static void __init dmi_format_ids(char *buf, size_t len)
434{
435	int c = 0;
436	const char *board;	/* Board Name is optional */
437
438	c += print_filtered(buf + c, len - c,
439			    dmi_get_system_info(DMI_SYS_VENDOR));
440	c += scnprintf(buf + c, len - c, " ");
441	c += print_filtered(buf + c, len - c,
442			    dmi_get_system_info(DMI_PRODUCT_NAME));
443
444	board = dmi_get_system_info(DMI_BOARD_NAME);
445	if (board) {
446		c += scnprintf(buf + c, len - c, "/");
447		c += print_filtered(buf + c, len - c, board);
448	}
449	c += scnprintf(buf + c, len - c, ", BIOS ");
450	c += print_filtered(buf + c, len - c,
451			    dmi_get_system_info(DMI_BIOS_VERSION));
452	c += scnprintf(buf + c, len - c, " ");
453	c += print_filtered(buf + c, len - c,
454			    dmi_get_system_info(DMI_BIOS_DATE));
455}
456
457/*
458 * Check for DMI/SMBIOS headers in the system firmware image.  Any
459 * SMBIOS header must start 16 bytes before the DMI header, so take a
460 * 32 byte buffer and check for DMI at offset 16 and SMBIOS at offset
461 * 0.  If the DMI header is present, set dmi_ver accordingly (SMBIOS
462 * takes precedence) and return 0.  Otherwise return 1.
463 */
464static int __init dmi_present(const u8 *buf)
465{
466	int smbios_ver;
467
468	if (memcmp(buf, "_SM_", 4) == 0 &&
469	    buf[5] < 32 && dmi_checksum(buf, buf[5])) {
470		smbios_ver = (buf[6] << 8) + buf[7];
 
 
471
472		/* Some BIOS report weird SMBIOS version, fix that up */
473		switch (smbios_ver) {
474		case 0x021F:
475		case 0x0221:
476			pr_debug("SMBIOS version fixup(2.%d->2.%d)\n",
477				 smbios_ver & 0xFF, 3);
478			smbios_ver = 0x0203;
479			break;
480		case 0x0233:
481			pr_debug("SMBIOS version fixup(2.%d->2.%d)\n", 51, 6);
482			smbios_ver = 0x0206;
483			break;
484		}
485	} else {
486		smbios_ver = 0;
487	}
488
489	buf += 16;
490
491	if (memcmp(buf, "_DMI_", 5) == 0 && dmi_checksum(buf, 15)) {
492		dmi_num = (buf[13] << 8) | buf[12];
493		dmi_len = (buf[7] << 8) | buf[6];
494		dmi_base = (buf[11] << 24) | (buf[10] << 16) |
495			(buf[9] << 8) | buf[8];
 
 
 
 
496
497		if (dmi_walk_early(dmi_decode) == 0) {
498			if (smbios_ver) {
499				dmi_ver = smbios_ver;
500				pr_info("SMBIOS %d.%d present.\n",
501				       dmi_ver >> 8, dmi_ver & 0xFF);
502			} else {
503				dmi_ver = (buf[14] & 0xF0) << 4 |
504					   (buf[14] & 0x0F);
 
505				pr_info("Legacy DMI %d.%d present.\n",
506				       dmi_ver >> 8, dmi_ver & 0xFF);
507			}
508			dmi_format_ids(dmi_ids_string, sizeof(dmi_ids_string));
509			printk(KERN_DEBUG "DMI: %s\n", dmi_ids_string);
510			return 0;
511		}
512	}
513
514	return 1;
515}
516
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
517void __init dmi_scan_machine(void)
518{
519	char __iomem *p, *q;
520	char buf[32];
521
522	if (efi_enabled(EFI_CONFIG_TABLES)) {
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
523		if (efi.smbios == EFI_INVALID_TABLE_ADDR)
524			goto error;
525
526		/* This is called as a core_initcall() because it isn't
527		 * needed during early boot.  This also means we can
528		 * iounmap the space when we're done with it.
529		 */
530		p = dmi_early_remap(efi.smbios, 32);
531		if (p == NULL)
532			goto error;
533		memcpy_fromio(buf, p, 32);
534		dmi_early_unmap(p, 32);
535
536		if (!dmi_present(buf)) {
537			dmi_available = 1;
538			goto out;
539		}
540	} else if (IS_ENABLED(CONFIG_DMI_SCAN_MACHINE_NON_EFI_FALLBACK)) {
541		p = dmi_early_remap(0xF0000, 0x10000);
542		if (p == NULL)
543			goto error;
544
545		/*
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
546		 * Iterate over all possible DMI header addresses q.
547		 * Maintain the 32 bytes around q in buf.  On the
548		 * first iteration, substitute zero for the
549		 * out-of-range bytes so there is no chance of falsely
550		 * detecting an SMBIOS header.
551		 */
552		memset(buf, 0, 16);
553		for (q = p; q < p + 0x10000; q += 16) {
554			memcpy_fromio(buf + 16, q, 16);
555			if (!dmi_present(buf)) {
556				dmi_available = 1;
557				dmi_early_unmap(p, 0x10000);
558				goto out;
559			}
560			memcpy(buf, buf + 16, 16);
561		}
562		dmi_early_unmap(p, 0x10000);
563	}
564 error:
565	pr_info("DMI not present or invalid.\n");
566 out:
567	dmi_initialized = 1;
568}
569
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
570/**
571 * dmi_set_dump_stack_arch_desc - set arch description for dump_stack()
572 *
573 * Invoke dump_stack_set_arch_desc() with DMI system information so that
574 * DMI identifiers are printed out on task dumps.  Arch boot code should
575 * call this function after dmi_scan_machine() if it wants to print out DMI
576 * identifiers on task dumps.
577 */
578void __init dmi_set_dump_stack_arch_desc(void)
579{
580	dump_stack_set_arch_desc("%s", dmi_ids_string);
581}
582
583/**
584 *	dmi_matches - check if dmi_system_id structure matches system DMI data
585 *	@dmi: pointer to the dmi_system_id structure to check
586 */
587static bool dmi_matches(const struct dmi_system_id *dmi)
588{
589	int i;
590
591	WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
592
593	for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
594		int s = dmi->matches[i].slot;
595		if (s == DMI_NONE)
596			break;
597		if (dmi_ident[s]) {
598			if (!dmi->matches[i].exact_match &&
599			    strstr(dmi_ident[s], dmi->matches[i].substr))
600				continue;
601			else if (dmi->matches[i].exact_match &&
602				 !strcmp(dmi_ident[s], dmi->matches[i].substr))
 
603				continue;
 
 
 
 
 
 
 
 
 
 
604		}
605
606		/* No match */
607		return false;
608	}
609	return true;
610}
611
612/**
613 *	dmi_is_end_of_table - check for end-of-table marker
614 *	@dmi: pointer to the dmi_system_id structure to check
615 */
616static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
617{
618	return dmi->matches[0].slot == DMI_NONE;
619}
620
621/**
622 *	dmi_check_system - check system DMI data
623 *	@list: array of dmi_system_id structures to match against
624 *		All non-null elements of the list must match
625 *		their slot's (field index's) data (i.e., each
626 *		list string must be a substring of the specified
627 *		DMI slot's string data) to be considered a
628 *		successful match.
629 *
630 *	Walk the blacklist table running matching functions until someone
631 *	returns non zero or we hit the end. Callback function is called for
632 *	each successful match. Returns the number of matches.
 
 
633 */
634int dmi_check_system(const struct dmi_system_id *list)
635{
636	int count = 0;
637	const struct dmi_system_id *d;
638
639	for (d = list; !dmi_is_end_of_table(d); d++)
640		if (dmi_matches(d)) {
641			count++;
642			if (d->callback && d->callback(d))
643				break;
644		}
645
646	return count;
647}
648EXPORT_SYMBOL(dmi_check_system);
649
650/**
651 *	dmi_first_match - find dmi_system_id structure matching system DMI data
652 *	@list: array of dmi_system_id structures to match against
653 *		All non-null elements of the list must match
654 *		their slot's (field index's) data (i.e., each
655 *		list string must be a substring of the specified
656 *		DMI slot's string data) to be considered a
657 *		successful match.
658 *
659 *	Walk the blacklist table until the first match is found.  Return the
660 *	pointer to the matching entry or NULL if there's no match.
 
 
661 */
662const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
663{
664	const struct dmi_system_id *d;
665
666	for (d = list; !dmi_is_end_of_table(d); d++)
667		if (dmi_matches(d))
668			return d;
669
670	return NULL;
671}
672EXPORT_SYMBOL(dmi_first_match);
673
674/**
675 *	dmi_get_system_info - return DMI data value
676 *	@field: data index (see enum dmi_field)
677 *
678 *	Returns one DMI data value, can be used to perform
679 *	complex DMI data checks.
680 */
681const char *dmi_get_system_info(int field)
682{
683	return dmi_ident[field];
684}
685EXPORT_SYMBOL(dmi_get_system_info);
686
687/**
688 * dmi_name_in_serial - Check if string is in the DMI product serial information
689 * @str: string to check for
690 */
691int dmi_name_in_serial(const char *str)
692{
693	int f = DMI_PRODUCT_SERIAL;
694	if (dmi_ident[f] && strstr(dmi_ident[f], str))
695		return 1;
696	return 0;
697}
698
699/**
700 *	dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
701 *	@str: Case sensitive Name
702 */
703int dmi_name_in_vendors(const char *str)
704{
705	static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
706	int i;
707	for (i = 0; fields[i] != DMI_NONE; i++) {
708		int f = fields[i];
709		if (dmi_ident[f] && strstr(dmi_ident[f], str))
710			return 1;
711	}
712	return 0;
713}
714EXPORT_SYMBOL(dmi_name_in_vendors);
715
716/**
717 *	dmi_find_device - find onboard device by type/name
718 *	@type: device type or %DMI_DEV_TYPE_ANY to match all device types
719 *	@name: device name string or %NULL to match all
720 *	@from: previous device found in search, or %NULL for new search.
721 *
722 *	Iterates through the list of known onboard devices. If a device is
723 *	found with a matching @vendor and @device, a pointer to its device
724 *	structure is returned.  Otherwise, %NULL is returned.
725 *	A new search is initiated by passing %NULL as the @from argument.
726 *	If @from is not %NULL, searches continue from next device.
727 */
728const struct dmi_device *dmi_find_device(int type, const char *name,
729				    const struct dmi_device *from)
730{
731	const struct list_head *head = from ? &from->list : &dmi_devices;
732	struct list_head *d;
733
734	for (d = head->next; d != &dmi_devices; d = d->next) {
735		const struct dmi_device *dev =
736			list_entry(d, struct dmi_device, list);
737
738		if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
739		    ((name == NULL) || (strcmp(dev->name, name) == 0)))
740			return dev;
741	}
742
743	return NULL;
744}
745EXPORT_SYMBOL(dmi_find_device);
746
747/**
748 *	dmi_get_date - parse a DMI date
749 *	@field:	data index (see enum dmi_field)
750 *	@yearp: optional out parameter for the year
751 *	@monthp: optional out parameter for the month
752 *	@dayp: optional out parameter for the day
753 *
754 *	The date field is assumed to be in the form resembling
755 *	[mm[/dd]]/yy[yy] and the result is stored in the out
756 *	parameters any or all of which can be omitted.
757 *
758 *	If the field doesn't exist, all out parameters are set to zero
759 *	and false is returned.  Otherwise, true is returned with any
760 *	invalid part of date set to zero.
761 *
762 *	On return, year, month and day are guaranteed to be in the
763 *	range of [0,9999], [0,12] and [0,31] respectively.
764 */
765bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
766{
767	int year = 0, month = 0, day = 0;
768	bool exists;
769	const char *s, *y;
770	char *e;
771
772	s = dmi_get_system_info(field);
773	exists = s;
774	if (!exists)
775		goto out;
776
777	/*
778	 * Determine year first.  We assume the date string resembles
779	 * mm/dd/yy[yy] but the original code extracted only the year
780	 * from the end.  Keep the behavior in the spirit of no
781	 * surprises.
782	 */
783	y = strrchr(s, '/');
784	if (!y)
785		goto out;
786
787	y++;
788	year = simple_strtoul(y, &e, 10);
789	if (y != e && year < 100) {	/* 2-digit year */
790		year += 1900;
791		if (year < 1996)	/* no dates < spec 1.0 */
792			year += 100;
793	}
794	if (year > 9999)		/* year should fit in %04d */
795		year = 0;
796
797	/* parse the mm and dd */
798	month = simple_strtoul(s, &e, 10);
799	if (s == e || *e != '/' || !month || month > 12) {
800		month = 0;
801		goto out;
802	}
803
804	s = e + 1;
805	day = simple_strtoul(s, &e, 10);
806	if (s == y || s == e || *e != '/' || day > 31)
807		day = 0;
808out:
809	if (yearp)
810		*yearp = year;
811	if (monthp)
812		*monthp = month;
813	if (dayp)
814		*dayp = day;
815	return exists;
816}
817EXPORT_SYMBOL(dmi_get_date);
818
819/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
820 *	dmi_walk - Walk the DMI table and get called back for every record
821 *	@decode: Callback function
822 *	@private_data: Private data to be passed to the callback function
823 *
824 *	Returns -1 when the DMI table can't be reached, 0 on success.
 
825 */
826int dmi_walk(void (*decode)(const struct dmi_header *, void *),
827	     void *private_data)
828{
829	u8 *buf;
830
831	if (!dmi_available)
832		return -1;
833
834	buf = dmi_remap(dmi_base, dmi_len);
835	if (buf == NULL)
836		return -1;
837
838	dmi_table(buf, dmi_len, dmi_num, decode, private_data);
839
840	dmi_unmap(buf);
841	return 0;
842}
843EXPORT_SYMBOL_GPL(dmi_walk);
844
845/**
846 * dmi_match - compare a string to the dmi field (if exists)
847 * @f: DMI field identifier
848 * @str: string to compare the DMI field to
849 *
850 * Returns true if the requested field equals to the str (including NULL).
851 */
852bool dmi_match(enum dmi_field f, const char *str)
853{
854	const char *info = dmi_get_system_info(f);
855
856	if (info == NULL || str == NULL)
857		return info == str;
858
859	return !strcmp(info, str);
860}
861EXPORT_SYMBOL_GPL(dmi_match);
862
863void dmi_memdev_name(u16 handle, const char **bank, const char **device)
864{
865	int n;
866
867	if (dmi_memdev == NULL)
868		return;
869
870	for (n = 0; n < dmi_memdev_nr; n++) {
871		if (handle == dmi_memdev[n].handle) {
872			*bank = dmi_memdev[n].bank;
873			*device = dmi_memdev[n].device;
874			break;
875		}
876	}
877}
878EXPORT_SYMBOL_GPL(dmi_memdev_name);