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 <common.h>
   9 #include <dm.h>
  10 #include <env.h>
  11 #include <mapmem.h>
  12 #include <smbios.h>
  13 #include <sysinfo.h>
  14 #include <tables_csum.h>
  15 #include <version.h>
  16 #ifdef CONFIG_CPU
  17 #include <cpu.h>
  18 #include <dm/uclass-internal.h>
  19 #endif
  20
  21 DECLARE_GLOBAL_DATA_PTR;
  22
  23 /**
  24  * struct smbios_ctx - context for writing SMBIOS tables
  25  *
  26  * @node:       node containing the information to write (ofnode_null() if none)
  27  * @dev:        sysinfo device to use (NULL if none)
  28  * @eos:        end-of-string pointer for the table being processed. This is set
  29  *              up when we start processing a table
  30  * @next_ptr:   pointer to the start of the next string to be added. When the
  31  *              table is nopt empty, this points to the byte after the \0 of the
  32  *              previous string.
  33  * @last_str:   points to the last string that was written to the table, or NULL
  34  *              if none
  35  */
  36 struct smbios_ctx {
  37         ofnode node;
  38         struct udevice *dev;
  39         char *eos;
  40         char *next_ptr;
  41         char *last_str;
  42 };
  43
  44 /**
  45  * Function prototype to write a specific type of SMBIOS structure
  46  *
  47  * @addr:       start address to write the structure
  48  * @handle:     the structure's handle, a unique 16-bit number
  49  * @ctx:        context for writing the tables
  50  * @return:     size of the structure
  51  */
  52 typedef int (*smbios_write_type)(ulong *addr, int handle,
  53                                  struct smbios_ctx *ctx);
  54
  55 /**
  56  * struct smbios_write_method - Information about a table-writing function
  57  *
  58  * @write: Function to call
  59  * @subnode_name: Name of subnode which has the information for this function,
  60  *      NULL if none
  61  */
  62 struct smbios_write_method {
  63         smbios_write_type write;
  64         const char *subnode_name;
  65 };
  66
  67 /**
  68  * smbios_add_string() - add a string to the string area
  69  *
  70  * This adds a string to the string area which is appended directly after
  71  * the formatted portion of an SMBIOS structure.
  72  *
  73  * @ctx:        SMBIOS context
  74  * @str:        string to add
  75  * @return:     string number in the string area (1 or more)
  76  */
  77 static int smbios_add_string(struct smbios_ctx *ctx, const char *str)
  78 {
  79         int i = 1;
  80         char *p = ctx->eos;
  81
  82         if (!*str)
  83                 str = "Unknown";
  84
  85         for (;;) {
  86                 if (!*p) {
  87                         ctx->last_str = p;
  88                         strcpy(p, str);
  89                         p += strlen(str);
  90                         *p++ = '\0';
  91                         ctx->next_ptr = p;
  92                         *p++ = '\0';
  93
  94                         return i;
  95                 }
  96
  97                 if (!strcmp(p, str)) {
  98                         ctx->last_str = p;
  99                         return i;
 100                 }
 101
 102                 p += strlen(p) + 1;
 103                 i++;
 104         }
 105 }
 106
 107 /**
 108  * smbios_add_prop_si() - Add a property from the devicetree or sysinfo
 109  *
 110  * Sysinfo is used if available, with a fallback to devicetree
 111  *
 112  * @ctx:        context for writing the tables
 113  * @prop:       property to write
 114  * @return 0 if not found, else SMBIOS string number (1 or more)
 115  */
 116 static int smbios_add_prop_si(struct smbios_ctx *ctx, const char *prop,
 117                               int sysinfo_id)
 118 {
 119         if (sysinfo_id && ctx->dev) {
 120                 char val[SMBIOS_STR_MAX];
 121                 int ret;
 122
 123                 ret = sysinfo_get_str(ctx->dev, sysinfo_id, sizeof(val), val);
 124                 if (!ret)
 125                         return smbios_add_string(ctx, val);
 126         }
 127         if (IS_ENABLED(CONFIG_OF_CONTROL)) {
 128                 const char *str;
 129
 130                 str = ofnode_read_string(ctx->node, prop);
 131                 if (str)
 132                         return smbios_add_string(ctx, str);
 133         }
 134
 135         return 0;
 136 }
 137
 138 /**
 139  * smbios_add_prop() - Add a property from the devicetree
 140  *
 141  * @prop:       property to write
 142  * @return 0 if not found, else SMBIOS string number (1 or more)
 143  */
 144 static int smbios_add_prop(struct smbios_ctx *ctx, const char *prop)
 145 {
 146         return smbios_add_prop_si(ctx, prop, SYSINFO_ID_NONE);
 147 }
 148
 149 static void smbios_set_eos(struct smbios_ctx *ctx, char *eos)
 150 {
 151         ctx->eos = eos;
 152         ctx->next_ptr = eos;
 153         ctx->last_str = NULL;
 154 }
 155
 156 int smbios_update_version(const char *version)
 157 {
 158         char *ptr = gd->smbios_version;
 159         uint old_len, len;
 160
 161         if (!ptr)
 162                 return log_ret(-ENOENT);
 163
 164         /*
 165          * This string is supposed to have at least enough bytes and is
 166          * padded with spaces. Update it, taking care not to move the
 167          * \0 terminator, so that other strings in the string table
 168          * are not disturbed. See smbios_add_string()
 169          */
 170         old_len = strnlen(ptr, SMBIOS_STR_MAX);
 171         len = strnlen(version, SMBIOS_STR_MAX);
 172         if (len > old_len)
 173                 return log_ret(-ENOSPC);
 174
 175         log_debug("Replacing SMBIOS type 0 version string '%s'\n", ptr);
 176         memcpy(ptr, version, len);
 177 #ifdef LOG_DEBUG
 178         print_buffer((ulong)ptr, ptr, 1, old_len + 1, 0);
 179 #endif
 180
 181         return 0;
 182 }
 183
 184 /**
 185  * smbios_string_table_len() - compute the string area size
 186  *
 187  * This computes the size of the string area including the string terminator.
 188  *
 189  * @ctx:        SMBIOS context
 190  * @return:     string area size
 191  */
 192 static int smbios_string_table_len(const struct smbios_ctx *ctx)
 193 {
 194         /* Allow for the final \0 after all strings */
 195         return (ctx->next_ptr + 1) - ctx->eos;
 196 }
 197
 198 static int smbios_write_type0(ulong *current, int handle,
 199                               struct smbios_ctx *ctx)
 200 {
 201         struct smbios_type0 *t;
 202         int len = sizeof(struct smbios_type0);
 203
 204         t = map_sysmem(*current, len);
 205         memset(t, 0, sizeof(struct smbios_type0));
 206         fill_smbios_header(t, SMBIOS_BIOS_INFORMATION, len, handle);
 207         smbios_set_eos(ctx, t->eos);
 208         t->vendor = smbios_add_string(ctx, "U-Boot");
 209
 210         t->bios_ver = smbios_add_prop(ctx, "version");
 211         if (!t->bios_ver)
 212                 t->bios_ver = smbios_add_string(ctx, PLAIN_VERSION);
 213         if (t->bios_ver)
 214                 gd->smbios_version = ctx->last_str;
 215         log_debug("smbios_version = %p: '%s'\n", gd->smbios_version,
 216                   gd->smbios_version);
 217 #ifdef LOG_DEBUG
 218         print_buffer((ulong)gd->smbios_version, gd->smbios_version,
 219                      1, strlen(gd->smbios_version) + 1, 0);
 220 #endif
 221         t->bios_release_date = smbios_add_string(ctx, U_BOOT_DMI_DATE);
 222 #ifdef CONFIG_ROM_SIZE
 223         t->bios_rom_size = (CONFIG_ROM_SIZE / 65536) - 1;
 224 #endif
 225         t->bios_characteristics = BIOS_CHARACTERISTICS_PCI_SUPPORTED |
 226                                   BIOS_CHARACTERISTICS_SELECTABLE_BOOT |
 227                                   BIOS_CHARACTERISTICS_UPGRADEABLE;
 228 #ifdef CONFIG_GENERATE_ACPI_TABLE
 229         t->bios_characteristics_ext1 = BIOS_CHARACTERISTICS_EXT1_ACPI;
 230 #endif
 231 #ifdef CONFIG_EFI_LOADER
 232         t->bios_characteristics_ext1 |= BIOS_CHARACTERISTICS_EXT1_UEFI;
 233 #endif
 234         t->bios_characteristics_ext2 = BIOS_CHARACTERISTICS_EXT2_TARGET;
 235
 236         /* bios_major_release has only one byte, so drop century */
 237         t->bios_major_release = U_BOOT_VERSION_NUM % 100;
 238         t->bios_minor_release = U_BOOT_VERSION_NUM_PATCH;
 239         t->ec_major_release = 0xff;
 240         t->ec_minor_release = 0xff;
 241
 242         len = t->length + smbios_string_table_len(ctx);
 243         *current += len;
 244         unmap_sysmem(t);
 245
 246         return len;
 247 }
 248
 249 static int smbios_write_type1(ulong *current, int handle,
 250                               struct smbios_ctx *ctx)
 251 {
 252         struct smbios_type1 *t;
 253         int len = sizeof(struct smbios_type1);
 254         char *serial_str = env_get("serial#");
 255
 256         t = map_sysmem(*current, len);
 257         memset(t, 0, sizeof(struct smbios_type1));
 258         fill_smbios_header(t, SMBIOS_SYSTEM_INFORMATION, len, handle);
 259         smbios_set_eos(ctx, t->eos);
 260         t->manufacturer = smbios_add_prop(ctx, "manufacturer");
 261         t->product_name = smbios_add_prop(ctx, "product");
 262         t->version = smbios_add_prop_si(ctx, "version",
 263                                         SYSINFO_ID_SMBIOS_SYSTEM_VERSION);
 264         if (serial_str) {
 265                 t->serial_number = smbios_add_string(ctx, serial_str);
 266                 strncpy((char *)t->uuid, serial_str, sizeof(t->uuid));
 267         } else {
 268                 t->serial_number = smbios_add_prop(ctx, "serial");
 269         }
 270         t->sku_number = smbios_add_prop(ctx, "sku");
 271         t->family = smbios_add_prop(ctx, "family");
 272
 273         len = t->length + smbios_string_table_len(ctx);
 274         *current += len;
 275         unmap_sysmem(t);
 276
 277         return len;
 278 }
 279
 280 static int smbios_write_type2(ulong *current, int handle,
 281                               struct smbios_ctx *ctx)
 282 {
 283         struct smbios_type2 *t;
 284         int len = sizeof(struct smbios_type2);
 285
 286         t = map_sysmem(*current, len);
 287         memset(t, 0, sizeof(struct smbios_type2));
 288         fill_smbios_header(t, SMBIOS_BOARD_INFORMATION, len, handle);
 289         smbios_set_eos(ctx, t->eos);
 290         t->manufacturer = smbios_add_prop(ctx, "manufacturer");
 291         t->product_name = smbios_add_prop(ctx, "product");
 292         t->version = smbios_add_prop_si(ctx, "version",
 293                                         SYSINFO_ID_SMBIOS_BASEBOARD_VERSION);
 294         t->asset_tag_number = smbios_add_prop(ctx, "asset-tag");
 295         t->feature_flags = SMBIOS_BOARD_FEATURE_HOSTING;
 296         t->board_type = SMBIOS_BOARD_MOTHERBOARD;
 297
 298         len = t->length + smbios_string_table_len(ctx);
 299         *current += len;
 300         unmap_sysmem(t);
 301
 302         return len;
 303 }
 304
 305 static int smbios_write_type3(ulong *current, int handle,
 306                               struct smbios_ctx *ctx)
 307 {
 308         struct smbios_type3 *t;
 309         int len = sizeof(struct smbios_type3);
 310
 311         t = map_sysmem(*current, len);
 312         memset(t, 0, sizeof(struct smbios_type3));
 313         fill_smbios_header(t, SMBIOS_SYSTEM_ENCLOSURE, len, handle);
 314         smbios_set_eos(ctx, t->eos);
 315         t->manufacturer = smbios_add_prop(ctx, "manufacturer");
 316         t->chassis_type = SMBIOS_ENCLOSURE_DESKTOP;
 317         t->bootup_state = SMBIOS_STATE_SAFE;
 318         t->power_supply_state = SMBIOS_STATE_SAFE;
 319         t->thermal_state = SMBIOS_STATE_SAFE;
 320         t->security_status = SMBIOS_SECURITY_NONE;
 321
 322         len = t->length + smbios_string_table_len(ctx);
 323         *current += len;
 324         unmap_sysmem(t);
 325
 326         return len;
 327 }
 328
 329 static void smbios_write_type4_dm(struct smbios_type4 *t,
 330                                   struct smbios_ctx *ctx)
 331 {
 332         u16 processor_family = SMBIOS_PROCESSOR_FAMILY_UNKNOWN;
 333         const char *vendor = "Unknown";
 334         const char *name = "Unknown";
 335
 336 #ifdef CONFIG_CPU
 337         char processor_name[49];
 338         char vendor_name[49];
 339         struct udevice *cpu = NULL;
 340
 341         uclass_find_first_device(UCLASS_CPU, &cpu);
 342         if (cpu) {
 343                 struct cpu_plat *plat = dev_get_parent_plat(cpu);
 344
 345                 if (plat->family)
 346                         processor_family = plat->family;
 347                 t->processor_id[0] = plat->id[0];
 348                 t->processor_id[1] = plat->id[1];
 349
 350                 if (!cpu_get_vendor(cpu, vendor_name, sizeof(vendor_name)))
 351                         vendor = vendor_name;
 352                 if (!cpu_get_desc(cpu, processor_name, sizeof(processor_name)))
 353                         name = processor_name;
 354         }
 355 #endif
 356
 357         t->processor_family = processor_family;
 358         t->processor_manufacturer = smbios_add_string(ctx, vendor);
 359         t->processor_version = smbios_add_string(ctx, name);
 360 }
 361
 362 static int smbios_write_type4(ulong *current, int handle,
 363                               struct smbios_ctx *ctx)
 364 {
 365         struct smbios_type4 *t;
 366         int len = sizeof(struct smbios_type4);
 367
 368         t = map_sysmem(*current, len);
 369         memset(t, 0, sizeof(struct smbios_type4));
 370         fill_smbios_header(t, SMBIOS_PROCESSOR_INFORMATION, len, handle);
 371         smbios_set_eos(ctx, t->eos);
 372         t->processor_type = SMBIOS_PROCESSOR_TYPE_CENTRAL;
 373         smbios_write_type4_dm(t, ctx);
 374         t->status = SMBIOS_PROCESSOR_STATUS_ENABLED;
 375         t->processor_upgrade = SMBIOS_PROCESSOR_UPGRADE_NONE;
 376         t->l1_cache_handle = 0xffff;
 377         t->l2_cache_handle = 0xffff;
 378         t->l3_cache_handle = 0xffff;
 379         t->processor_family2 = t->processor_family;
 380
 381         len = t->length + smbios_string_table_len(ctx);
 382         *current += len;
 383         unmap_sysmem(t);
 384
 385         return len;
 386 }
 387
 388 static int smbios_write_type32(ulong *current, int handle,
 389                                struct smbios_ctx *ctx)
 390 {
 391         struct smbios_type32 *t;
 392         int len = sizeof(struct smbios_type32);
 393
 394         t = map_sysmem(*current, len);
 395         memset(t, 0, sizeof(struct smbios_type32));
 396         fill_smbios_header(t, SMBIOS_SYSTEM_BOOT_INFORMATION, len, handle);
 397         smbios_set_eos(ctx, t->eos);
 398
 399         *current += len;
 400         unmap_sysmem(t);
 401
 402         return len;
 403 }
 404
 405 static int smbios_write_type127(ulong *current, int handle,
 406                                 struct smbios_ctx *ctx)
 407 {
 408         struct smbios_type127 *t;
 409         int len = sizeof(struct smbios_type127);
 410
 411         t = map_sysmem(*current, len);
 412         memset(t, 0, sizeof(struct smbios_type127));
 413         fill_smbios_header(t, SMBIOS_END_OF_TABLE, len, handle);
 414
 415         *current += len;
 416         unmap_sysmem(t);
 417
 418         return len;
 419 }
 420
 421 static struct smbios_write_method smbios_write_funcs[] = {
 422         { smbios_write_type0, "bios", },
 423         { smbios_write_type1, "system", },
 424         { smbios_write_type2, "baseboard", },
 425         { smbios_write_type3, "chassis", },
 426         { smbios_write_type4, },
 427         { smbios_write_type32, },
 428         { smbios_write_type127 },
 429 };
 430
 431 ulong write_smbios_table(ulong addr)
 432 {
 433         ofnode parent_node = ofnode_null();
 434         struct smbios_entry *se;
 435         struct smbios_ctx ctx;
 436         ulong table_addr;
 437         ulong tables;
 438         int len = 0;
 439         int max_struct_size = 0;
 440         int handle = 0;
 441         char *istart;
 442         int isize;
 443         int i;
 444
 445         ctx.node = ofnode_null();
 446         if (IS_ENABLED(CONFIG_OF_CONTROL)) {
 447                 uclass_first_device(UCLASS_SYSINFO, &ctx.dev);
 448                 if (ctx.dev)
 449                         parent_node = dev_read_subnode(ctx.dev, "smbios");
 450         } else {
 451                 ctx.dev = NULL;
 452         }
 453
 454         /* 16 byte align the table address */
 455         addr = ALIGN(addr, 16);
 456
 457         se = map_sysmem(addr, sizeof(struct smbios_entry));
 458         memset(se, 0, sizeof(struct smbios_entry));
 459
 460         addr += sizeof(struct smbios_entry);
 461         addr = ALIGN(addr, 16);
 462         tables = addr;
 463
 464         /* populate minimum required tables */
 465         for (i = 0; i < ARRAY_SIZE(smbios_write_funcs); i++) {
 466                 const struct smbios_write_method *method;
 467                 int tmp;
 468
 469                 method = &smbios_write_funcs[i];
 470                 if (IS_ENABLED(CONFIG_OF_CONTROL) && method->subnode_name)
 471                         ctx.node = ofnode_find_subnode(parent_node,
 472                                                        method->subnode_name);
 473                 tmp = method->write((ulong *)&addr, handle++, &ctx);
 474
 475                 max_struct_size = max(max_struct_size, tmp);
 476                 len += tmp;
 477         }
 478
 479         memcpy(se->anchor, "_SM_", 4);
 480         se->length = sizeof(struct smbios_entry);
 481         se->major_ver = SMBIOS_MAJOR_VER;
 482         se->minor_ver = SMBIOS_MINOR_VER;
 483         se->max_struct_size = max_struct_size;
 484         memcpy(se->intermediate_anchor, "_DMI_", 5);
 485         se->struct_table_length = len;
 486
 487         /*
 488          * We must use a pointer here so things work correctly on sandbox. The
 489          * user of this table is not aware of the mapping of addresses to
 490          * sandbox's DRAM buffer.
 491          */
 492         table_addr = (ulong)map_sysmem(tables, 0);
 493         if (sizeof(table_addr) > sizeof(u32) && table_addr > (ulong)UINT_MAX) {
 494                 /*
 495                  * We need to put this >32-bit pointer into the table but the
 496                  * field is only 32 bits wide.
 497                  */
 498                 printf("WARNING: SMBIOS table_address overflow %llx\n",
 499                        (unsigned long long)table_addr);
 500                 table_addr = 0;
 501         }
 502         se->struct_table_address = table_addr;
 503
 504         se->struct_count = handle;
 505
 506         /* calculate checksums */
 507         istart = (char *)se + SMBIOS_INTERMEDIATE_OFFSET;
 508         isize = sizeof(struct smbios_entry) - SMBIOS_INTERMEDIATE_OFFSET;
 509         se->intermediate_checksum = table_compute_checksum(istart, isize);
 510         se->checksum = table_compute_checksum(se, sizeof(struct smbios_entry));
 511         unmap_sysmem(se);
 512
 513         return addr;
 514 }