linux/drivers/firmware/dmi_scan.c
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   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
  12/*
  13 * DMI stands for "Desktop Management Interface".  It is part
  14 * of and an antecedent to, SMBIOS, which stands for System
  15 * Management BIOS.  See further: http://www.dmtf.org/standards
  16 */
  17static char dmi_empty_string[] = "        ";
  18
  19/*
  20 * Catch too early calls to dmi_check_system():
  21 */
  22static int dmi_initialized;
  23
  24static const char * __init dmi_string_nosave(const struct dmi_header *dm, u8 s)
  25{
  26        const u8 *bp = ((u8 *) dm) + dm->length;
  27
  28        if (s) {
  29                s--;
  30                while (s > 0 && *bp) {
  31                        bp += strlen(bp) + 1;
  32                        s--;
  33                }
  34
  35                if (*bp != 0) {
  36                        size_t len = strlen(bp)+1;
  37                        size_t cmp_len = len > 8 ? 8 : len;
  38
  39                        if (!memcmp(bp, dmi_empty_string, cmp_len))
  40                                return dmi_empty_string;
  41                        return bp;
  42                }
  43        }
  44
  45        return "";
  46}
  47
  48static char * __init dmi_string(const struct dmi_header *dm, u8 s)
  49{
  50        const char *bp = dmi_string_nosave(dm, s);
  51        char *str;
  52        size_t len;
  53
  54        if (bp == dmi_empty_string)
  55                return dmi_empty_string;
  56
  57        len = strlen(bp) + 1;
  58        str = dmi_alloc(len);
  59        if (str != NULL)
  60                strcpy(str, bp);
  61        else
  62                printk(KERN_ERR "dmi_string: cannot allocate %Zu bytes.\n", len);
  63
  64        return str;
  65}
  66
  67/*
  68 *      We have to be cautious here. We have seen BIOSes with DMI pointers
  69 *      pointing to completely the wrong place for example
  70 */
  71static void dmi_table(u8 *buf, int len, int num,
  72                      void (*decode)(const struct dmi_header *, void *),
  73                      void *private_data)
  74{
  75        u8 *data = buf;
  76        int i = 0;
  77
  78        /*
  79         *      Stop when we see all the items the table claimed to have
  80         *      OR we run off the end of the table (also happens)
  81         */
  82        while ((i < num) && (data - buf + sizeof(struct dmi_header)) <= len) {
  83                const struct dmi_header *dm = (const struct dmi_header *)data;
  84
  85                /*
  86                 *  We want to know the total length (formatted area and
  87                 *  strings) before decoding to make sure we won't run off the
  88                 *  table in dmi_decode or dmi_string
  89                 */
  90                data += dm->length;
  91                while ((data - buf < len - 1) && (data[0] || data[1]))
  92                        data++;
  93                if (data - buf < len - 1)
  94                        decode(dm, private_data);
  95                data += 2;
  96                i++;
  97        }
  98}
  99
 100static u32 dmi_base;
 101static u16 dmi_len;
 102static u16 dmi_num;
 103
 104static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,
 105                void *))
 106{
 107        u8 *buf;
 108
 109        buf = dmi_ioremap(dmi_base, dmi_len);
 110        if (buf == NULL)
 111                return -1;
 112
 113        dmi_table(buf, dmi_len, dmi_num, decode, NULL);
 114
 115        add_device_randomness(buf, dmi_len);
 116
 117        dmi_iounmap(buf, dmi_len);
 118        return 0;
 119}
 120
 121static int __init dmi_checksum(const u8 *buf)
 122{
 123        u8 sum = 0;
 124        int a;
 125
 126        for (a = 0; a < 15; a++)
 127                sum += buf[a];
 128
 129        return sum == 0;
 130}
 131
 132static char *dmi_ident[DMI_STRING_MAX];
 133static LIST_HEAD(dmi_devices);
 134int dmi_available;
 135
 136/*
 137 *      Save a DMI string
 138 */
 139static void __init dmi_save_ident(const struct dmi_header *dm, int slot, int string)
 140{
 141        const char *d = (const char*) dm;
 142        char *p;
 143
 144        if (dmi_ident[slot])
 145                return;
 146
 147        p = dmi_string(dm, d[string]);
 148        if (p == NULL)
 149                return;
 150
 151        dmi_ident[slot] = p;
 152}
 153
 154static void __init dmi_save_uuid(const struct dmi_header *dm, int slot, int index)
 155{
 156        const u8 *d = (u8*) dm + index;
 157        char *s;
 158        int is_ff = 1, is_00 = 1, i;
 159
 160        if (dmi_ident[slot])
 161                return;
 162
 163        for (i = 0; i < 16 && (is_ff || is_00); i++) {
 164                if(d[i] != 0x00) is_ff = 0;
 165                if(d[i] != 0xFF) is_00 = 0;
 166        }
 167
 168        if (is_ff || is_00)
 169                return;
 170
 171        s = dmi_alloc(16*2+4+1);
 172        if (!s)
 173                return;
 174
 175        sprintf(s, "%pUB", d);
 176
 177        dmi_ident[slot] = s;
 178}
 179
 180static void __init dmi_save_type(const struct dmi_header *dm, int slot, int index)
 181{
 182        const u8 *d = (u8*) dm + index;
 183        char *s;
 184
 185        if (dmi_ident[slot])
 186                return;
 187
 188        s = dmi_alloc(4);
 189        if (!s)
 190                return;
 191
 192        sprintf(s, "%u", *d & 0x7F);
 193        dmi_ident[slot] = s;
 194}
 195
 196static void __init dmi_save_one_device(int type, const char *name)
 197{
 198        struct dmi_device *dev;
 199
 200        /* No duplicate device */
 201        if (dmi_find_device(type, name, NULL))
 202                return;
 203
 204        dev = dmi_alloc(sizeof(*dev) + strlen(name) + 1);
 205        if (!dev) {
 206                printk(KERN_ERR "dmi_save_one_device: out of memory.\n");
 207                return;
 208        }
 209
 210        dev->type = type;
 211        strcpy((char *)(dev + 1), name);
 212        dev->name = (char *)(dev + 1);
 213        dev->device_data = NULL;
 214        list_add(&dev->list, &dmi_devices);
 215}
 216
 217static void __init dmi_save_devices(const struct dmi_header *dm)
 218{
 219        int i, count = (dm->length - sizeof(struct dmi_header)) / 2;
 220
 221        for (i = 0; i < count; i++) {
 222                const char *d = (char *)(dm + 1) + (i * 2);
 223
 224                /* Skip disabled device */
 225                if ((*d & 0x80) == 0)
 226                        continue;
 227
 228                dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d + 1)));
 229        }
 230}
 231
 232static void __init dmi_save_oem_strings_devices(const struct dmi_header *dm)
 233{
 234        int i, count = *(u8 *)(dm + 1);
 235        struct dmi_device *dev;
 236
 237        for (i = 1; i <= count; i++) {
 238                char *devname = dmi_string(dm, i);
 239
 240                if (devname == dmi_empty_string)
 241                        continue;
 242
 243                dev = dmi_alloc(sizeof(*dev));
 244                if (!dev) {
 245                        printk(KERN_ERR
 246                           "dmi_save_oem_strings_devices: out of memory.\n");
 247                        break;
 248                }
 249
 250                dev->type = DMI_DEV_TYPE_OEM_STRING;
 251                dev->name = devname;
 252                dev->device_data = NULL;
 253
 254                list_add(&dev->list, &dmi_devices);
 255        }
 256}
 257
 258static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
 259{
 260        struct dmi_device *dev;
 261        void * data;
 262
 263        data = dmi_alloc(dm->length);
 264        if (data == NULL) {
 265                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 266                return;
 267        }
 268
 269        memcpy(data, dm, dm->length);
 270
 271        dev = dmi_alloc(sizeof(*dev));
 272        if (!dev) {
 273                printk(KERN_ERR "dmi_save_ipmi_device: out of memory.\n");
 274                return;
 275        }
 276
 277        dev->type = DMI_DEV_TYPE_IPMI;
 278        dev->name = "IPMI controller";
 279        dev->device_data = data;
 280
 281        list_add_tail(&dev->list, &dmi_devices);
 282}
 283
 284static void __init dmi_save_dev_onboard(int instance, int segment, int bus,
 285                                        int devfn, const char *name)
 286{
 287        struct dmi_dev_onboard *onboard_dev;
 288
 289        onboard_dev = dmi_alloc(sizeof(*onboard_dev) + strlen(name) + 1);
 290        if (!onboard_dev) {
 291                printk(KERN_ERR "dmi_save_dev_onboard: out of memory.\n");
 292                return;
 293        }
 294        onboard_dev->instance = instance;
 295        onboard_dev->segment = segment;
 296        onboard_dev->bus = bus;
 297        onboard_dev->devfn = devfn;
 298
 299        strcpy((char *)&onboard_dev[1], name);
 300        onboard_dev->dev.type = DMI_DEV_TYPE_DEV_ONBOARD;
 301        onboard_dev->dev.name = (char *)&onboard_dev[1];
 302        onboard_dev->dev.device_data = onboard_dev;
 303
 304        list_add(&onboard_dev->dev.list, &dmi_devices);
 305}
 306
 307static void __init dmi_save_extended_devices(const struct dmi_header *dm)
 308{
 309        const u8 *d = (u8*) dm + 5;
 310
 311        /* Skip disabled device */
 312        if ((*d & 0x80) == 0)
 313                return;
 314
 315        dmi_save_dev_onboard(*(d+1), *(u16 *)(d+2), *(d+4), *(d+5),
 316                             dmi_string_nosave(dm, *(d-1)));
 317        dmi_save_one_device(*d & 0x7f, dmi_string_nosave(dm, *(d - 1)));
 318}
 319
 320/*
 321 *      Process a DMI table entry. Right now all we care about are the BIOS
 322 *      and machine entries. For 2.5 we should pull the smbus controller info
 323 *      out of here.
 324 */
 325static void __init dmi_decode(const struct dmi_header *dm, void *dummy)
 326{
 327        switch(dm->type) {
 328        case 0:         /* BIOS Information */
 329                dmi_save_ident(dm, DMI_BIOS_VENDOR, 4);
 330                dmi_save_ident(dm, DMI_BIOS_VERSION, 5);
 331                dmi_save_ident(dm, DMI_BIOS_DATE, 8);
 332                break;
 333        case 1:         /* System Information */
 334                dmi_save_ident(dm, DMI_SYS_VENDOR, 4);
 335                dmi_save_ident(dm, DMI_PRODUCT_NAME, 5);
 336                dmi_save_ident(dm, DMI_PRODUCT_VERSION, 6);
 337                dmi_save_ident(dm, DMI_PRODUCT_SERIAL, 7);
 338                dmi_save_uuid(dm, DMI_PRODUCT_UUID, 8);
 339                break;
 340        case 2:         /* Base Board Information */
 341                dmi_save_ident(dm, DMI_BOARD_VENDOR, 4);
 342                dmi_save_ident(dm, DMI_BOARD_NAME, 5);
 343                dmi_save_ident(dm, DMI_BOARD_VERSION, 6);
 344                dmi_save_ident(dm, DMI_BOARD_SERIAL, 7);
 345                dmi_save_ident(dm, DMI_BOARD_ASSET_TAG, 8);
 346                break;
 347        case 3:         /* Chassis Information */
 348                dmi_save_ident(dm, DMI_CHASSIS_VENDOR, 4);
 349                dmi_save_type(dm, DMI_CHASSIS_TYPE, 5);
 350                dmi_save_ident(dm, DMI_CHASSIS_VERSION, 6);
 351                dmi_save_ident(dm, DMI_CHASSIS_SERIAL, 7);
 352                dmi_save_ident(dm, DMI_CHASSIS_ASSET_TAG, 8);
 353                break;
 354        case 10:        /* Onboard Devices Information */
 355                dmi_save_devices(dm);
 356                break;
 357        case 11:        /* OEM Strings */
 358                dmi_save_oem_strings_devices(dm);
 359                break;
 360        case 38:        /* IPMI Device Information */
 361                dmi_save_ipmi_device(dm);
 362                break;
 363        case 41:        /* Onboard Devices Extended Information */
 364                dmi_save_extended_devices(dm);
 365        }
 366}
 367
 368static void __init print_filtered(const char *info)
 369{
 370        const char *p;
 371
 372        if (!info)
 373                return;
 374
 375        for (p = info; *p; p++)
 376                if (isprint(*p))
 377                        printk(KERN_CONT "%c", *p);
 378                else
 379                        printk(KERN_CONT "\\x%02x", *p & 0xff);
 380}
 381
 382static void __init dmi_dump_ids(void)
 383{
 384        const char *board;      /* Board Name is optional */
 385
 386        printk(KERN_DEBUG "DMI: ");
 387        print_filtered(dmi_get_system_info(DMI_SYS_VENDOR));
 388        printk(KERN_CONT " ");
 389        print_filtered(dmi_get_system_info(DMI_PRODUCT_NAME));
 390        board = dmi_get_system_info(DMI_BOARD_NAME);
 391        if (board) {
 392                printk(KERN_CONT "/");
 393                print_filtered(board);
 394        }
 395        printk(KERN_CONT ", BIOS ");
 396        print_filtered(dmi_get_system_info(DMI_BIOS_VERSION));
 397        printk(KERN_CONT " ");
 398        print_filtered(dmi_get_system_info(DMI_BIOS_DATE));
 399        printk(KERN_CONT "\n");
 400}
 401
 402static int __init dmi_present(const char __iomem *p)
 403{
 404        u8 buf[15];
 405
 406        memcpy_fromio(buf, p, 15);
 407        if ((memcmp(buf, "_DMI_", 5) == 0) && dmi_checksum(buf)) {
 408                dmi_num = (buf[13] << 8) | buf[12];
 409                dmi_len = (buf[7] << 8) | buf[6];
 410                dmi_base = (buf[11] << 24) | (buf[10] << 16) |
 411                        (buf[9] << 8) | buf[8];
 412
 413                /*
 414                 * DMI version 0.0 means that the real version is taken from
 415                 * the SMBIOS version, which we don't know at this point.
 416                 */
 417                if (buf[14] != 0)
 418                        printk(KERN_INFO "DMI %d.%d present.\n",
 419                               buf[14] >> 4, buf[14] & 0xF);
 420                else
 421                        printk(KERN_INFO "DMI present.\n");
 422                if (dmi_walk_early(dmi_decode) == 0) {
 423                        dmi_dump_ids();
 424                        return 0;
 425                }
 426        }
 427        return 1;
 428}
 429
 430void __init dmi_scan_machine(void)
 431{
 432        char __iomem *p, *q;
 433        int rc;
 434
 435        if (efi_enabled) {
 436                if (efi.smbios == EFI_INVALID_TABLE_ADDR)
 437                        goto error;
 438
 439                /* This is called as a core_initcall() because it isn't
 440                 * needed during early boot.  This also means we can
 441                 * iounmap the space when we're done with it.
 442                 */
 443                p = dmi_ioremap(efi.smbios, 32);
 444                if (p == NULL)
 445                        goto error;
 446
 447                rc = dmi_present(p + 0x10); /* offset of _DMI_ string */
 448                dmi_iounmap(p, 32);
 449                if (!rc) {
 450                        dmi_available = 1;
 451                        goto out;
 452                }
 453        }
 454        else {
 455                /*
 456                 * no iounmap() for that ioremap(); it would be a no-op, but
 457                 * it's so early in setup that sucker gets confused into doing
 458                 * what it shouldn't if we actually call it.
 459                 */
 460                p = dmi_ioremap(0xF0000, 0x10000);
 461                if (p == NULL)
 462                        goto error;
 463
 464                for (q = p; q < p + 0x10000; q += 16) {
 465                        rc = dmi_present(q);
 466                        if (!rc) {
 467                                dmi_available = 1;
 468                                dmi_iounmap(p, 0x10000);
 469                                goto out;
 470                        }
 471                }
 472                dmi_iounmap(p, 0x10000);
 473        }
 474 error:
 475        printk(KERN_INFO "DMI not present or invalid.\n");
 476 out:
 477        dmi_initialized = 1;
 478}
 479
 480/**
 481 *      dmi_matches - check if dmi_system_id structure matches system DMI data
 482 *      @dmi: pointer to the dmi_system_id structure to check
 483 */
 484static bool dmi_matches(const struct dmi_system_id *dmi)
 485{
 486        int i;
 487
 488        WARN(!dmi_initialized, KERN_ERR "dmi check: not initialized yet.\n");
 489
 490        for (i = 0; i < ARRAY_SIZE(dmi->matches); i++) {
 491                int s = dmi->matches[i].slot;
 492                if (s == DMI_NONE)
 493                        break;
 494                if (dmi_ident[s]
 495                    && strstr(dmi_ident[s], dmi->matches[i].substr))
 496                        continue;
 497                /* No match */
 498                return false;
 499        }
 500        return true;
 501}
 502
 503/**
 504 *      dmi_is_end_of_table - check for end-of-table marker
 505 *      @dmi: pointer to the dmi_system_id structure to check
 506 */
 507static bool dmi_is_end_of_table(const struct dmi_system_id *dmi)
 508{
 509        return dmi->matches[0].slot == DMI_NONE;
 510}
 511
 512/**
 513 *      dmi_check_system - check system DMI data
 514 *      @list: array of dmi_system_id structures to match against
 515 *              All non-null elements of the list must match
 516 *              their slot's (field index's) data (i.e., each
 517 *              list string must be a substring of the specified
 518 *              DMI slot's string data) to be considered a
 519 *              successful match.
 520 *
 521 *      Walk the blacklist table running matching functions until someone
 522 *      returns non zero or we hit the end. Callback function is called for
 523 *      each successful match. Returns the number of matches.
 524 */
 525int dmi_check_system(const struct dmi_system_id *list)
 526{
 527        int count = 0;
 528        const struct dmi_system_id *d;
 529
 530        for (d = list; !dmi_is_end_of_table(d); d++)
 531                if (dmi_matches(d)) {
 532                        count++;
 533                        if (d->callback && d->callback(d))
 534                                break;
 535                }
 536
 537        return count;
 538}
 539EXPORT_SYMBOL(dmi_check_system);
 540
 541/**
 542 *      dmi_first_match - find dmi_system_id structure matching system DMI data
 543 *      @list: array of dmi_system_id structures to match against
 544 *              All non-null elements of the list must match
 545 *              their slot's (field index's) data (i.e., each
 546 *              list string must be a substring of the specified
 547 *              DMI slot's string data) to be considered a
 548 *              successful match.
 549 *
 550 *      Walk the blacklist table until the first match is found.  Return the
 551 *      pointer to the matching entry or NULL if there's no match.
 552 */
 553const struct dmi_system_id *dmi_first_match(const struct dmi_system_id *list)
 554{
 555        const struct dmi_system_id *d;
 556
 557        for (d = list; !dmi_is_end_of_table(d); d++)
 558                if (dmi_matches(d))
 559                        return d;
 560
 561        return NULL;
 562}
 563EXPORT_SYMBOL(dmi_first_match);
 564
 565/**
 566 *      dmi_get_system_info - return DMI data value
 567 *      @field: data index (see enum dmi_field)
 568 *
 569 *      Returns one DMI data value, can be used to perform
 570 *      complex DMI data checks.
 571 */
 572const char *dmi_get_system_info(int field)
 573{
 574        return dmi_ident[field];
 575}
 576EXPORT_SYMBOL(dmi_get_system_info);
 577
 578/**
 579 * dmi_name_in_serial - Check if string is in the DMI product serial information
 580 * @str: string to check for
 581 */
 582int dmi_name_in_serial(const char *str)
 583{
 584        int f = DMI_PRODUCT_SERIAL;
 585        if (dmi_ident[f] && strstr(dmi_ident[f], str))
 586                return 1;
 587        return 0;
 588}
 589
 590/**
 591 *      dmi_name_in_vendors - Check if string is in the DMI system or board vendor name
 592 *      @str:   Case sensitive Name
 593 */
 594int dmi_name_in_vendors(const char *str)
 595{
 596        static int fields[] = { DMI_SYS_VENDOR, DMI_BOARD_VENDOR, DMI_NONE };
 597        int i;
 598        for (i = 0; fields[i] != DMI_NONE; i++) {
 599                int f = fields[i];
 600                if (dmi_ident[f] && strstr(dmi_ident[f], str))
 601                        return 1;
 602        }
 603        return 0;
 604}
 605EXPORT_SYMBOL(dmi_name_in_vendors);
 606
 607/**
 608 *      dmi_find_device - find onboard device by type/name
 609 *      @type: device type or %DMI_DEV_TYPE_ANY to match all device types
 610 *      @name: device name string or %NULL to match all
 611 *      @from: previous device found in search, or %NULL for new search.
 612 *
 613 *      Iterates through the list of known onboard devices. If a device is
 614 *      found with a matching @vendor and @device, a pointer to its device
 615 *      structure is returned.  Otherwise, %NULL is returned.
 616 *      A new search is initiated by passing %NULL as the @from argument.
 617 *      If @from is not %NULL, searches continue from next device.
 618 */
 619const struct dmi_device * dmi_find_device(int type, const char *name,
 620                                    const struct dmi_device *from)
 621{
 622        const struct list_head *head = from ? &from->list : &dmi_devices;
 623        struct list_head *d;
 624
 625        for(d = head->next; d != &dmi_devices; d = d->next) {
 626                const struct dmi_device *dev =
 627                        list_entry(d, struct dmi_device, list);
 628
 629                if (((type == DMI_DEV_TYPE_ANY) || (dev->type == type)) &&
 630                    ((name == NULL) || (strcmp(dev->name, name) == 0)))
 631                        return dev;
 632        }
 633
 634        return NULL;
 635}
 636EXPORT_SYMBOL(dmi_find_device);
 637
 638/**
 639 *      dmi_get_date - parse a DMI date
 640 *      @field: data index (see enum dmi_field)
 641 *      @yearp: optional out parameter for the year
 642 *      @monthp: optional out parameter for the month
 643 *      @dayp: optional out parameter for the day
 644 *
 645 *      The date field is assumed to be in the form resembling
 646 *      [mm[/dd]]/yy[yy] and the result is stored in the out
 647 *      parameters any or all of which can be omitted.
 648 *
 649 *      If the field doesn't exist, all out parameters are set to zero
 650 *      and false is returned.  Otherwise, true is returned with any
 651 *      invalid part of date set to zero.
 652 *
 653 *      On return, year, month and day are guaranteed to be in the
 654 *      range of [0,9999], [0,12] and [0,31] respectively.
 655 */
 656bool dmi_get_date(int field, int *yearp, int *monthp, int *dayp)
 657{
 658        int year = 0, month = 0, day = 0;
 659        bool exists;
 660        const char *s, *y;
 661        char *e;
 662
 663        s = dmi_get_system_info(field);
 664        exists = s;
 665        if (!exists)
 666                goto out;
 667
 668        /*
 669         * Determine year first.  We assume the date string resembles
 670         * mm/dd/yy[yy] but the original code extracted only the year
 671         * from the end.  Keep the behavior in the spirit of no
 672         * surprises.
 673         */
 674        y = strrchr(s, '/');
 675        if (!y)
 676                goto out;
 677
 678        y++;
 679        year = simple_strtoul(y, &e, 10);
 680        if (y != e && year < 100) {     /* 2-digit year */
 681                year += 1900;
 682                if (year < 1996)        /* no dates < spec 1.0 */
 683                        year += 100;
 684        }
 685        if (year > 9999)                /* year should fit in %04d */
 686                year = 0;
 687
 688        /* parse the mm and dd */
 689        month = simple_strtoul(s, &e, 10);
 690        if (s == e || *e != '/' || !month || month > 12) {
 691                month = 0;
 692                goto out;
 693        }
 694
 695        s = e + 1;
 696        day = simple_strtoul(s, &e, 10);
 697        if (s == y || s == e || *e != '/' || day > 31)
 698                day = 0;
 699out:
 700        if (yearp)
 701                *yearp = year;
 702        if (monthp)
 703                *monthp = month;
 704        if (dayp)
 705                *dayp = day;
 706        return exists;
 707}
 708EXPORT_SYMBOL(dmi_get_date);
 709
 710/**
 711 *      dmi_walk - Walk the DMI table and get called back for every record
 712 *      @decode: Callback function
 713 *      @private_data: Private data to be passed to the callback function
 714 *
 715 *      Returns -1 when the DMI table can't be reached, 0 on success.
 716 */
 717int dmi_walk(void (*decode)(const struct dmi_header *, void *),
 718             void *private_data)
 719{
 720        u8 *buf;
 721
 722        if (!dmi_available)
 723                return -1;
 724
 725        buf = ioremap(dmi_base, dmi_len);
 726        if (buf == NULL)
 727                return -1;
 728
 729        dmi_table(buf, dmi_len, dmi_num, decode, private_data);
 730
 731        iounmap(buf);
 732        return 0;
 733}
 734EXPORT_SYMBOL_GPL(dmi_walk);
 735
 736/**
 737 * dmi_match - compare a string to the dmi field (if exists)
 738 * @f: DMI field identifier
 739 * @str: string to compare the DMI field to
 740 *
 741 * Returns true if the requested field equals to the str (including NULL).
 742 */
 743bool dmi_match(enum dmi_field f, const char *str)
 744{
 745        const char *info = dmi_get_system_info(f);
 746
 747        if (info == NULL || str == NULL)
 748                return info == str;
 749
 750        return !strcmp(info, str);
 751}
 752EXPORT_SYMBOL_GPL(dmi_match);
 753
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