lib/smbios.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
   4  *
   5  * Adapted from coreboot src/arch/x86/smbios.c
   6  */
   7
   8 #include <dm.h>
   9 #include <env.h>
  10 #include <linux/stringify.h>
  11 #include <linux/string.h>
  12 #include <mapmem.h>
  13 #include <smbios.h>
  14 #include <sysinfo.h>
  15 #include <tables_csum.h>
  16 #include <version.h>
  17 #include <malloc.h>
  18 #include <dm/ofnode.h>
  19 #ifdef CONFIG_CPU
  20 #include <cpu.h>
  21 #include <dm/uclass-internal.h>
  22 #endif
  23
  24 /* Safeguard for checking that U_BOOT_VERSION_NUM macros are compatible with U_BOOT_DMI */
  25 #if U_BOOT_VERSION_NUM < 2000 || U_BOOT_VERSION_NUM > 2099 || \
  26     U_BOOT_VERSION_NUM_PATCH < 1 || U_BOOT_VERSION_NUM_PATCH > 12
  27 #error U_BOOT_VERSION_NUM macros are not compatible with DMI, fix U_BOOT_DMI macros
  28 #endif
  29
  30 /*
  31  * U_BOOT_DMI_DATE contains BIOS Release Date in format mm/dd/yyyy.
  32  * BIOS Release Date is calculated from U-Boot version and fixed day 01.
  33  * So for U-Boot version 2021.04 it is calculated as "04/01/2021".
  34  * BIOS Release Date should contain date when code was released
  35  * and not when it was built or compiled.
  36  */
  37 #if U_BOOT_VERSION_NUM_PATCH < 10
  38 #define U_BOOT_DMI_MONTH "0" __stringify(U_BOOT_VERSION_NUM_PATCH)
  39 #else
  40 #define U_BOOT_DMI_MONTH __stringify(U_BOOT_VERSION_NUM_PATCH)
  41 #endif
  42 #define U_BOOT_DMI_DAY "01"
  43 #define U_BOOT_DMI_YEAR __stringify(U_BOOT_VERSION_NUM)
  44 #define U_BOOT_DMI_DATE U_BOOT_DMI_MONTH "/" U_BOOT_DMI_DAY "/" U_BOOT_DMI_YEAR
  45
  46 DECLARE_GLOBAL_DATA_PTR;
  47
  48 /**
  49  * struct map_sysinfo - Mapping of sysinfo strings to DT
  50  *
  51  * @si_str: sysinfo string
  52  * @dt_str: DT string
  53  * @max: Max index of the tokenized string to pick. Counting starts from 0
  54  *
  55  */
  56 struct map_sysinfo {
  57         const char *si_node;
  58         const char *si_str;
  59         const char *dt_str;
  60         int max;
  61 };
  62
  63 static const struct map_sysinfo sysinfo_to_dt[] = {
  64         { .si_node = "system", .si_str = "product", .dt_str = "model", 2 },
  65         { .si_node = "system", .si_str = "manufacturer", .dt_str = "compatible", 1 },
  66         { .si_node = "baseboard", .si_str = "product", .dt_str = "model", 2 },
  67         { .si_node = "baseboard", .si_str = "manufacturer", .dt_str = "compatible", 1 },
  68 };
  69
  70 /**
  71  * struct smbios_ctx - context for writing SMBIOS tables
  72  *
  73  * @node:               node containing the information to write (ofnode_null()
  74  *                      if none)
  75  * @dev:                sysinfo device to use (NULL if none)
  76  * @subnode_name:       sysinfo subnode_name. Used for DT fallback
  77  * @eos:                end-of-string pointer for the table being processed.
  78  *                      This is set up when we start processing a table
  79  * @next_ptr:           pointer to the start of the next string to be added.
  80  *                      When the table is not empty, this points to the byte
  81  *                      after the \0 of the previous string.
  82  * @last_str:           points to the last string that was written to the table,
  83  *                      or NULL if none
  84  */
  85 struct smbios_ctx {
  86         ofnode node;
  87         struct udevice *dev;
  88         const char *subnode_name;
  89         char *eos;
  90         char *next_ptr;
  91         char *last_str;
  92 };
  93
  94 /**
  95  * Function prototype to write a specific type of SMBIOS structure
  96  *
  97  * @addr:       start address to write the structure
  98  * @handle:     the structure's handle, a unique 16-bit number
  99  * @ctx:        context for writing the tables
 100  * Return:      size of the structure
 101  */
 102 typedef int (*smbios_write_type)(ulong *addr, int handle,
 103                                  struct smbios_ctx *ctx);
 104
 105 /**
 106  * struct smbios_write_method - Information about a table-writing function
 107  *
 108  * @write: Function to call
 109  * @subnode_name: Name of subnode which has the information for this function,
 110  *      NULL if none
 111  */
 112 struct smbios_write_method {
 113         smbios_write_type write;
 114         const char *subnode_name;
 115 };
 116
 117 static const struct map_sysinfo *convert_sysinfo_to_dt(const char *node, const char *si)
 118 {
 119         int i;
 120
 121         for (i = 0; i < ARRAY_SIZE(sysinfo_to_dt); i++) {
 122                 if (node && !strcmp(node, sysinfo_to_dt[i].si_node) &&
 123                     !strcmp(si, sysinfo_to_dt[i].si_str))
 124                         return &sysinfo_to_dt[i];
 125         }
 126
 127         return NULL;
 128 }
 129
 130 /**
 131  * smbios_add_string() - add a string to the string area
 132  *
 133  * This adds a string to the string area which is appended directly after
 134  * the formatted portion of an SMBIOS structure.
 135  *
 136  * @ctx:        SMBIOS context
 137  * @str:        string to add
 138  * Return:      string number in the string area. 0 if str is NULL.
 139  */
 140 static int smbios_add_string(struct smbios_ctx *ctx, const char *str)
 141 {
 142         int i = 1;
 143         char *p = ctx->eos;
 144
 145         if (!str)
 146                 return 0;
 147
 148         for (;;) {
 149                 if (!*p) {
 150                         ctx->last_str = p;
 151                         strcpy(p, str);
 152                         p += strlen(str);
 153                         *p++ = '\0';
 154                         ctx->next_ptr = p;
 155                         *p++ = '\0';
 156
 157                         return i;
 158                 }
 159
 160                 if (!strcmp(p, str)) {
 161                         ctx->last_str = p;
 162                         return i;
 163                 }
 164
 165                 p += strlen(p) + 1;
 166                 i++;
 167         }
 168 }
 169
 170 /**
 171  * get_str_from_dt - Get a substring from a DT property.
 172  *                   After finding the property in the DT, the function
 173  *                   will parse comma-separated values and return the value.
 174  *                   If nprop->max exceeds the number of comma-separated
 175  *                   elements, the last non NULL value will be returned.
 176  *                   Counting starts from zero.
 177  *
 178  * @nprop: sysinfo property to use
 179  * @str: pointer to fill with data
 180  * @size: str buffer length
 181  */
 182 static
 183 void get_str_from_dt(const struct map_sysinfo *nprop, char *str, size_t size)
 184 {
 185         const char *dt_str;
 186         int cnt = 0;
 187         char *token;
 188
 189         memset(str, 0, size);
 190         if (!nprop || !nprop->max)
 191                 return;
 192
 193         dt_str = ofnode_read_string(ofnode_root(), nprop->dt_str);
 194         if (!dt_str)
 195                 return;
 196
 197         memcpy(str, dt_str, size);
 198         token = strtok(str, ",");
 199         while (token && cnt < nprop->max) {
 200                 strlcpy(str, token, strlen(token) + 1);
 201                 token = strtok(NULL, ",");
 202                 cnt++;
 203         }
 204 }
 205
 206 /**
 207  * smbios_add_prop_si() - Add a property from the devicetree or sysinfo
 208  *
 209  * Sysinfo is used if available, with a fallback to devicetree
 210  *
 211  * @ctx:        context for writing the tables
 212  * @prop:       property to write
 213  * @sysinfo_id: unique identifier for the string value to be read
 214  * @dval:       Default value to use if the string is not found or is empty
 215  * Return:      0 if not found, else SMBIOS string number (1 or more)
 216  */
 217 static int smbios_add_prop_si(struct smbios_ctx *ctx, const char *prop,
 218                               int sysinfo_id, const char *dval)
 219 {
 220         int ret;
 221
 222         if (!dval || !*dval)
 223                 dval = NULL;
 224
 225         if (!prop)
 226                 return smbios_add_string(ctx, dval);
 227
 228         if (sysinfo_id && ctx->dev) {
 229                 char val[SMBIOS_STR_MAX];
 230
 231                 ret = sysinfo_get_str(ctx->dev, sysinfo_id, sizeof(val), val);
 232                 if (!ret)
 233                         return smbios_add_string(ctx, val);
 234         }
 235         if (IS_ENABLED(CONFIG_OF_CONTROL)) {
 236                 const char *str = NULL;
 237                 char str_dt[128] = { 0 };
 238                 /*
 239                  * If the node is not valid fallback and try the entire DT
 240                  * so we can at least fill in manufacturer and board type
 241                  */
 242                 if (ofnode_valid(ctx->node)) {
 243                         str = ofnode_read_string(ctx->node, prop);
 244                 } else {
 245                         const struct map_sysinfo *nprop;
 246
 247                         nprop = convert_sysinfo_to_dt(ctx->subnode_name, prop);
 248                         get_str_from_dt(nprop, str_dt, sizeof(str_dt));
 249                         str = (const char *)str_dt;
 250                 }
 251
 252                 ret = smbios_add_string(ctx, str && *str ? str : dval);
 253                 return ret;
 254         }
 255
 256         return 0;
 257 }
 258
 259 /**
 260  * smbios_add_prop() - Add a property from the devicetree
 261  *
 262  * @prop:       property to write. The default string will be written if
 263  *              prop is NULL
 264  * @dval:       Default value to use if the string is not found or is empty
 265  * Return:      0 if not found, else SMBIOS string number (1 or more)
 266  */
 267 static int smbios_add_prop(struct smbios_ctx *ctx, const char *prop,
 268                            const char *dval)
 269 {
 270         return smbios_add_prop_si(ctx, prop, SYSINFO_ID_NONE, dval);
 271 }
 272
 273 static void smbios_set_eos(struct smbios_ctx *ctx, char *eos)
 274 {
 275         ctx->eos = eos;
 276         ctx->next_ptr = eos;
 277         ctx->last_str = NULL;
 278 }
 279
 280 int smbios_update_version(const char *version)
 281 {
 282         char *ptr = gd->smbios_version;
 283         uint old_len, len;
 284
 285         if (!ptr)
 286                 return log_ret(-ENOENT);
 287
 288         /*
 289          * This string is supposed to have at least enough bytes and is
 290          * padded with spaces. Update it, taking care not to move the
 291          * \0 terminator, so that other strings in the string table
 292          * are not disturbed. See smbios_add_string()
 293          */
 294         old_len = strnlen(ptr, SMBIOS_STR_MAX);
 295         len = strnlen(version, SMBIOS_STR_MAX);
 296         if (len > old_len)
 297                 return log_ret(-ENOSPC);
 298
 299         log_debug("Replacing SMBIOS type 0 version string '%s'\n", ptr);
 300         memcpy(ptr, version, len);
 301 #ifdef LOG_DEBUG
 302         print_buffer((ulong)ptr, ptr, 1, old_len + 1, 0);
 303 #endif
 304
 305         return 0;
 306 }
 307
 308 /**
 309  * smbios_string_table_len() - compute the string area size
 310  *
 311  * This computes the size of the string area including the string terminator.
 312  *
 313  * @ctx:        SMBIOS context
 314  * Return:      string area size
 315  */
 316 static int smbios_string_table_len(const struct smbios_ctx *ctx)
 317 {
 318         /* In case no string is defined we have to return two \0 */
 319         if (ctx->next_ptr == ctx->eos)
 320                 return 2;
 321
 322         /* Allow for the final \0 after all strings */
 323         return (ctx->next_ptr + 1) - ctx->eos;
 324 }
 325
 326 static int smbios_write_type0(ulong *current, int handle,
 327                               struct smbios_ctx *ctx)
 328 {
 329         struct smbios_type0 *t;
 330         int len = sizeof(struct smbios_type0);
 331
 332         t = map_sysmem(*current, len);
 333         memset(t, 0, sizeof(struct smbios_type0));
 334         fill_smbios_header(t, SMBIOS_BIOS_INFORMATION, len, handle);
 335         smbios_set_eos(ctx, t->eos);
 336         t->vendor = smbios_add_prop(ctx, NULL, "U-Boot");
 337
 338         t->bios_ver = smbios_add_prop(ctx, "version", PLAIN_VERSION);
 339         if (t->bios_ver)
 340                 gd->smbios_version = ctx->last_str;
 341         log_debug("smbios_version = %p: '%s'\n", gd->smbios_version,
 342                   gd->smbios_version);
 343 #ifdef LOG_DEBUG
 344         print_buffer((ulong)gd->smbios_version, gd->smbios_version,
 345                      1, strlen(gd->smbios_version) + 1, 0);
 346 #endif
 347         t->bios_release_date = smbios_add_prop(ctx, NULL, U_BOOT_DMI_DATE);
 348 #ifdef CONFIG_ROM_SIZE
 349         t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
 350 #endif
 351         t->bios_characteristics = BIOS_CHARACTERISTICS_PCI_SUPPORTED |
 352                                   BIOS_CHARACTERISTICS_SELECTABLE_BOOT |
 353                                   BIOS_CHARACTERISTICS_UPGRADEABLE;
 354 #ifdef CONFIG_GENERATE_ACPI_TABLE
 355         t->bios_characteristics_ext1 = BIOS_CHARACTERISTICS_EXT1_ACPI;
 356 #endif
 357 #ifdef CONFIG_EFI_LOADER
 358         t->bios_characteristics_ext2 |= BIOS_CHARACTERISTICS_EXT2_UEFI;
 359 #endif
 360         t->bios_characteristics_ext2 |= BIOS_CHARACTERISTICS_EXT2_TARGET;
 361
 362         /* bios_major_release has only one byte, so drop century */
 363         t->bios_major_release = U_BOOT_VERSION_NUM % 100;
 364         t->bios_minor_release = U_BOOT_VERSION_NUM_PATCH;
 365         t->ec_major_release = 0xff;
 366         t->ec_minor_release = 0xff;
 367
 368         len = t->length + smbios_string_table_len(ctx);
 369         *current += len;
 370         unmap_sysmem(t);
 371
 372         return len;
 373 }
 374
 375 static int smbios_write_type1(ulong *current, int handle,
 376                               struct smbios_ctx *ctx)
 377 {
 378         struct smbios_type1 *t;
 379         int len = sizeof(struct smbios_type1);
 380         char *serial_str = env_get("serial#");
 381
 382         t = map_sysmem(*current, len);
 383         memset(t, 0, sizeof(struct smbios_type1));
 384         fill_smbios_header(t, SMBIOS_SYSTEM_INFORMATION, len, handle);
 385         smbios_set_eos(ctx, t->eos);
 386         t->manufacturer = smbios_add_prop(ctx, "manufacturer", NULL);
 387         t->product_name = smbios_add_prop(ctx, "product", NULL);
 388         t->version = smbios_add_prop_si(ctx, "version",
 389                                         SYSINFO_ID_SMBIOS_SYSTEM_VERSION,
 390                                         NULL);
 391         if (serial_str) {
 392                 t->serial_number = smbios_add_prop(ctx, NULL, serial_str);
 393                 strncpy((char *)t->uuid, serial_str, sizeof(t->uuid));
 394         } else {
 395                 t->serial_number = smbios_add_prop(ctx, "serial", NULL);
 396         }
 397         t->sku_number = smbios_add_prop(ctx, "sku", NULL);
 398         t->family = smbios_add_prop(ctx, "family", NULL);
 399
 400         len = t->length + smbios_string_table_len(ctx);
 401         *current += len;
 402         unmap_sysmem(t);
 403
 404         return len;
 405 }
 406
 407 static int smbios_write_type2(ulong *current, int handle,
 408                               struct smbios_ctx *ctx)
 409 {
 410         struct smbios_type2 *t;
 411         int len = sizeof(struct smbios_type2);
 412
 413         t = map_sysmem(*current, len);
 414         memset(t, 0, sizeof(struct smbios_type2));
 415         fill_smbios_header(t, SMBIOS_BOARD_INFORMATION, len, handle);
 416         smbios_set_eos(ctx, t->eos);
 417         t->manufacturer = smbios_add_prop(ctx, "manufacturer", NULL);
 418         t->product_name = smbios_add_prop(ctx, "product", NULL);
 419         t->version = smbios_add_prop_si(ctx, "version",
 420                                         SYSINFO_ID_SMBIOS_BASEBOARD_VERSION,
 421                                         NULL);
 422         t->asset_tag_number = smbios_add_prop(ctx, "asset-tag", NULL);
 423         t->feature_flags = SMBIOS_BOARD_FEATURE_HOSTING;
 424         t->board_type = SMBIOS_BOARD_MOTHERBOARD;
 425         t->chassis_handle = handle + 1;
 426
 427         len = t->length + smbios_string_table_len(ctx);
 428         *current += len;
 429         unmap_sysmem(t);
 430
 431         return len;
 432 }
 433
 434 static int smbios_write_type3(ulong *current, int handle,
 435                               struct smbios_ctx *ctx)
 436 {
 437         struct smbios_type3 *t;
 438         int len = sizeof(struct smbios_type3);
 439
 440         t = map_sysmem(*current, len);
 441         memset(t, 0, sizeof(struct smbios_type3));
 442         fill_smbios_header(t, SMBIOS_SYSTEM_ENCLOSURE, len, handle);
 443         smbios_set_eos(ctx, t->eos);
 444         t->manufacturer = smbios_add_prop(ctx, "manufacturer", NULL);
 445         t->chassis_type = SMBIOS_ENCLOSURE_DESKTOP;
 446         t->bootup_state = SMBIOS_STATE_SAFE;
 447         t->power_supply_state = SMBIOS_STATE_SAFE;
 448         t->thermal_state = SMBIOS_STATE_SAFE;
 449         t->security_status = SMBIOS_SECURITY_NONE;
 450
 451         len = t->length + smbios_string_table_len(ctx);
 452         *current += len;
 453         unmap_sysmem(t);
 454
 455         return len;
 456 }
 457
 458 static void smbios_write_type4_dm(struct smbios_type4 *t,
 459                                   struct smbios_ctx *ctx)
 460 {
 461         u16 processor_family = SMBIOS_PROCESSOR_FAMILY_UNKNOWN;
 462         const char *vendor = NULL;
 463         const char *name = NULL;
 464
 465 #ifdef CONFIG_CPU
 466         char processor_name[49];
 467         char vendor_name[49];
 468         struct udevice *cpu = NULL;
 469
 470         uclass_find_first_device(UCLASS_CPU, &cpu);
 471         if (cpu) {
 472                 struct cpu_plat *plat = dev_get_parent_plat(cpu);
 473
 474                 if (plat->family)
 475                         processor_family = plat->family;
 476                 t->processor_id[0] = plat->id[0];
 477                 t->processor_id[1] = plat->id[1];
 478
 479                 if (!cpu_get_vendor(cpu, vendor_name, sizeof(vendor_name)))
 480                         vendor = vendor_name;
 481                 if (!cpu_get_desc(cpu, processor_name, sizeof(processor_name)))
 482                         name = processor_name;
 483         }
 484 #endif
 485
 486         t->processor_family = 0xfe;
 487         t->processor_family2 = processor_family;
 488         t->processor_manufacturer = smbios_add_prop(ctx, NULL, vendor);
 489         t->processor_version = smbios_add_prop(ctx, NULL, name);
 490 }
 491
 492 static int smbios_write_type4(ulong *current, int handle,
 493                               struct smbios_ctx *ctx)
 494 {
 495         struct smbios_type4 *t;
 496         int len = sizeof(struct smbios_type4);
 497
 498         t = map_sysmem(*current, len);
 499         memset(t, 0, sizeof(struct smbios_type4));
 500         fill_smbios_header(t, SMBIOS_PROCESSOR_INFORMATION, len, handle);
 501         smbios_set_eos(ctx, t->eos);
 502         t->processor_type = SMBIOS_PROCESSOR_TYPE_CENTRAL;
 503         smbios_write_type4_dm(t, ctx);
 504         t->status = SMBIOS_PROCESSOR_STATUS_ENABLED;
 505         t->processor_upgrade = SMBIOS_PROCESSOR_UPGRADE_NONE;
 506         t->l1_cache_handle = 0xffff;
 507         t->l2_cache_handle = 0xffff;
 508         t->l3_cache_handle = 0xffff;
 509
 510         len = t->length + smbios_string_table_len(ctx);
 511         *current += len;
 512         unmap_sysmem(t);
 513
 514         return len;
 515 }
 516
 517 static int smbios_write_type32(ulong *current, int handle,
 518                                struct smbios_ctx *ctx)
 519 {
 520         struct smbios_type32 *t;
 521         int len = sizeof(struct smbios_type32);
 522
 523         t = map_sysmem(*current, len);
 524         memset(t, 0, sizeof(struct smbios_type32));
 525         fill_smbios_header(t, SMBIOS_SYSTEM_BOOT_INFORMATION, len, handle);
 526         smbios_set_eos(ctx, t->eos);
 527
 528         *current += len;
 529         unmap_sysmem(t);
 530
 531         return len;
 532 }
 533
 534 static int smbios_write_type127(ulong *current, int handle,
 535                                 struct smbios_ctx *ctx)
 536 {
 537         struct smbios_type127 *t;
 538         int len = sizeof(struct smbios_type127);
 539
 540         t = map_sysmem(*current, len);
 541         memset(t, 0, sizeof(struct smbios_type127));
 542         fill_smbios_header(t, SMBIOS_END_OF_TABLE, len, handle);
 543
 544         *current += len;
 545         unmap_sysmem(t);
 546
 547         return len;
 548 }
 549
 550 static struct smbios_write_method smbios_write_funcs[] = {
 551         { smbios_write_type0, "bios", },
 552         { smbios_write_type1, "system", },
 553         { smbios_write_type2, "baseboard", },
 554         /* Type 3 must immediately follow type 2 due to chassis handle. */
 555         { smbios_write_type3, "chassis", },
 556         { smbios_write_type4, },
 557         { smbios_write_type32, },
 558         { smbios_write_type127 },
 559 };
 560
 561 ulong write_smbios_table(ulong addr)
 562 {
 563         ofnode parent_node = ofnode_null();
 564         ulong table_addr, start_addr;
 565         struct smbios3_entry *se;
 566         struct smbios_ctx ctx;
 567         ulong tables;
 568         int len = 0;
 569         int handle = 0;
 570         int i;
 571
 572         ctx.node = ofnode_null();
 573         if (IS_ENABLED(CONFIG_OF_CONTROL)) {
 574                 uclass_first_device(UCLASS_SYSINFO, &ctx.dev);
 575                 if (ctx.dev)
 576                         parent_node = dev_read_subnode(ctx.dev, "smbios");
 577         } else {
 578                 ctx.dev = NULL;
 579         }
 580
 581         start_addr = addr;
 582
 583         /* move past the (so-far-unwritten) header to start writing structs */
 584         addr = ALIGN(addr + sizeof(struct smbios3_entry), 16);
 585         tables = addr;
 586
 587         /* populate minimum required tables */
 588         for (i = 0; i < ARRAY_SIZE(smbios_write_funcs); i++) {
 589                 const struct smbios_write_method *method;
 590
 591                 method = &smbios_write_funcs[i];
 592                 ctx.subnode_name = NULL;
 593                 if (method->subnode_name) {
 594                         ctx.subnode_name = method->subnode_name;
 595                         if (IS_ENABLED(CONFIG_OF_CONTROL))
 596                                 ctx.node = ofnode_find_subnode(parent_node,
 597                                                                method->subnode_name);
 598                 }
 599                 len += method->write((ulong *)&addr, handle++, &ctx);
 600         }
 601
 602         /*
 603          * We must use a pointer here so things work correctly on sandbox. The
 604          * user of this table is not aware of the mapping of addresses to
 605          * sandbox's DRAM buffer.
 606          */
 607         table_addr = (ulong)map_sysmem(tables, 0);
 608
 609         /* now go back and write the SMBIOS3 header */
 610         se = map_sysmem(start_addr, sizeof(struct smbios3_entry));
 611         memset(se, '\0', sizeof(struct smbios3_entry));
 612         memcpy(se->anchor, "_SM3_", 5);
 613         se->length = sizeof(struct smbios3_entry);
 614         se->major_ver = SMBIOS_MAJOR_VER;
 615         se->minor_ver = SMBIOS_MINOR_VER;
 616         se->doc_rev = 0;
 617         se->entry_point_rev = 1;
 618         se->table_maximum_size = len;
 619         se->struct_table_address = table_addr;
 620         se->checksum = table_compute_checksum(se, sizeof(struct smbios3_entry));
 621         unmap_sysmem(se);
 622
 623         return addr;
 624 }