1 /* 2 * Copyright (c) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 29 #include <stand.h> 30 #include <sys/endian.h> 31 32 #include "smbios.h" 33 34 /* 35 * Detect SMBIOS and export information about the SMBIOS into the 36 * environment. 37 * 38 * System Management BIOS Reference Specification, v2.6 Final 39 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf 40 * System Management BIOS (SMBIOS) Reference Specification, v3.1.0 41 * http://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.1.0.pdf 42 */ 43 44 /* 45 * 2.1.1 SMBIOS Structure Table Entry Point 46 * 47 * "On non-EFI systems, the SMBIOS Entry Point structure, described below, can 48 * be located by application software by searching for the anchor-string on 49 * paragraph (16-byte) boundaries within the physical memory address range 50 * 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate anchor 51 * string that is used by some existing DMI browsers." 52 */ 53 #define SMBIOS_START 0xf0000 54 #define SMBIOS_LENGTH 0x10000 55 #define SMBIOS_STEP 0x10 56 #define SMBIOS_SIG "_SM_" 57 #define SMBIOS_SIG_LEN (4) 58 #define SMBIOS3_SIG "_SM3_" 59 #define SMBIOS3_SIG_LEN (5) 60 #define SMBIOS_DMI_SIG "_DMI_" 61 #define SMBIOS_DMI_SIG_LEN (5) 62 63 #define SMBIOS_GET8(base, off) (*(uint8_t *)((base) + (off))) 64 #define SMBIOS_GET16(base, off) (*(uint16_t *)((base) + (off))) 65 #define SMBIOS_GET32(base, off) (*(uint32_t *)((base) + (off))) 66 #define SMBIOS_GET64(base, off) (*(uint64_t *)((base) + (off))) 67 68 #define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01) 69 #define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base)) 70 71 struct smbios_attr { 72 int probed; 73 caddr_t addr; 74 size_t length; 75 size_t count; 76 int major; 77 int minor; 78 int ver; 79 const char *bios_vendor; 80 const char *maker; 81 const char *product; 82 uint32_t enabled_memory; 83 uint32_t old_enabled_memory; 84 uint8_t enabled_sockets; 85 uint8_t populated_sockets; 86 }; 87 88 static struct smbios_attr smbios; 89 90 static uint8_t 91 smbios_checksum(const caddr_t addr, const uint8_t len) 92 { 93 uint8_t sum; 94 int i; 95 96 for (sum = 0, i = 0; i < len; i++) 97 sum += SMBIOS_GET8(addr, i); 98 return (sum); 99 } 100 101 static caddr_t 102 smbios_sigsearch(const caddr_t addr, const uint32_t len) 103 { 104 caddr_t cp; 105 uintptr_t paddr; 106 107 /* Search on 16-byte boundaries. */ 108 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP) { 109 if (strncmp(cp, SMBIOS_SIG, SMBIOS_SIG_LEN) == 0 && 110 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 && 111 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 112 SMBIOS_DMI_SIG_LEN) == 0 && 113 smbios_checksum(cp + 0x10, 0x0f) == 0) { 114 115 /* Structure Table Length */ 116 smbios.length = SMBIOS_GET16(cp, 0x16); 117 /* Structure Table Address */ 118 paddr = SMBIOS_GET32(cp, 0x18); 119 /* No of SMBIOS Structures */ 120 smbios.count = SMBIOS_GET16(cp, 0x1c); 121 /* SMBIOS BCD Revision */ 122 smbios.ver = SMBIOS_GET8(cp, 0x1e); 123 if (smbios.ver != 0) { 124 smbios.major = smbios.ver >> 4; 125 smbios.minor = smbios.ver & 0x0f; 126 if (smbios.major > 9 || smbios.minor > 9) 127 smbios.ver = 0; 128 } 129 if (smbios.ver == 0) { 130 /* SMBIOS Major Version */ 131 smbios.major = SMBIOS_GET8(cp, 0x06); 132 /* SMBIOS Minor Version */ 133 smbios.minor = SMBIOS_GET8(cp, 0x07); 134 } 135 smbios.ver = (smbios.major << 8) | smbios.minor; 136 smbios.addr = ptov(paddr); 137 return (cp); 138 } 139 #ifdef _LP64 140 /* 141 * Check for the SMBIOS 64-bit entry point introduced in 142 * version 3.0. 143 * 144 * The table address is a 64-bit physical address that may 145 * appear at any 64-bit address. We only search for 146 * the 64-bit entry point when running a 64-bit application. 147 */ 148 if (strncmp(cp, SMBIOS3_SIG, SMBIOS3_SIG_LEN) == 0 && 149 smbios_checksum(cp, SMBIOS_GET8(cp, 0x06)) == 0) { 150 151 /* SMBIOS Major Version */ 152 smbios.major = SMBIOS_GET8(cp, 0x07); 153 /* SMBIOS Minor Version */ 154 smbios.minor = SMBIOS_GET8(cp, 0x08); 155 /* Entry Point Revision */ 156 smbios.ver = SMBIOS_GET8(cp, 0x0a); 157 /* Structure Table maximum size */ 158 smbios.length = SMBIOS_GET32(cp, 0x0c); 159 /* Structure Table Address */ 160 paddr = SMBIOS_GET64(cp, 0x10); 161 smbios.addr = ptov(paddr); 162 /* 163 * Calculate upper limit for structure count, 164 * use size of table header (4 bytes). 165 */ 166 smbios.count = smbios.length / 4; 167 return (cp); 168 } 169 #endif 170 } 171 return (NULL); 172 } 173 174 static const char * 175 smbios_getstring(caddr_t addr, const int offset) 176 { 177 caddr_t cp; 178 int i, idx; 179 180 idx = SMBIOS_GET8(addr, offset); 181 if (idx != 0) { 182 cp = SMBIOS_GETSTR(addr); 183 for (i = 1; i < idx; i++) 184 cp += strlen(cp) + 1; 185 return (cp); 186 } 187 return (NULL); 188 } 189 190 static void 191 smbios_setenv(const char *name, caddr_t addr, const int offset) 192 { 193 const char *val; 194 195 val = smbios_getstring(addr, offset); 196 if (val != NULL) 197 setenv(name, val, 1); 198 } 199 200 #ifdef SMBIOS_SERIAL_NUMBERS 201 202 #define UUID_SIZE 16 203 #define UUID_TYPE uint32_t 204 #define UUID_STEP sizeof (UUID_TYPE) 205 #define UUID_ALL_BITS (UUID_SIZE / UUID_STEP) 206 #define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off))) 207 208 static void 209 smbios_setuuid(const char *name, const caddr_t addr) 210 { 211 char uuid[37]; 212 int byteorder, i, ones, zeros; 213 UUID_TYPE n; 214 uint32_t f1; 215 uint16_t f2, f3; 216 217 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) { 218 n = UUID_GET(addr, i) + 1; 219 if (zeros == 0 && n == 0) 220 ones++; 221 else if (ones == 0 && n == 1) 222 zeros++; 223 else 224 break; 225 } 226 227 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) { 228 /* 229 * 3.3.2.1 System UUID 230 * 231 * "Although RFC 4122 recommends network byte order for all 232 * fields, the PC industry (including the ACPI, UEFI, and 233 * Microsoft specifications) has consistently used 234 * little-endian byte encoding for the first three fields: 235 * time_low, time_mid, time_hi_and_version. The same encoding, 236 * also known as wire format, should also be used for the 237 * SMBIOS representation of the UUID." 238 * 239 * Note: We use network byte order for backward compatibility 240 * unless SMBIOS version is 2.6+ or little-endian is forced. 241 */ 242 #if defined(SMBIOS_LITTLE_ENDIAN_UUID) 243 byteorder = LITTLE_ENDIAN; 244 #elif defined(SMBIOS_NETWORK_ENDIAN_UUID) 245 byteorder = BIG_ENDIAN; 246 #else 247 byteorder = ver < 0x0206 ? BIG_ENDIAN : LITTLE_ENDIAN; 248 #endif 249 if (byteorder != LITTLE_ENDIAN) { 250 f1 = ntohl(SMBIOS_GET32(addr, 0)); 251 f2 = ntohs(SMBIOS_GET16(addr, 4)); 252 f3 = ntohs(SMBIOS_GET16(addr, 6)); 253 } else { 254 f1 = le32toh(SMBIOS_GET32(addr, 0)); 255 f2 = le16toh(SMBIOS_GET16(addr, 4)); 256 f3 = le16toh(SMBIOS_GET16(addr, 6)); 257 } 258 sprintf(uuid, 259 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 260 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9), 261 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11), 262 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13), 263 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15)); 264 setenv(name, uuid, 1); 265 } 266 } 267 268 #undef UUID_SIZE 269 #undef UUID_TYPE 270 #undef UUID_STEP 271 #undef UUID_ALL_BITS 272 #undef UUID_GET 273 274 #endif 275 276 static caddr_t 277 smbios_parse_table(const caddr_t addr) 278 { 279 caddr_t cp; 280 int proc, size, osize, type; 281 282 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */ 283 switch (type) { 284 case 0: /* 3.3.1 BIOS Information (Type 0) */ 285 smbios_setenv("smbios.bios.vendor", addr, 0x04); 286 smbios_setenv("smbios.bios.version", addr, 0x05); 287 smbios_setenv("smbios.bios.reldate", addr, 0x08); 288 break; 289 290 case 1: /* 3.3.2 System Information (Type 1) */ 291 smbios_setenv("smbios.system.maker", addr, 0x04); 292 smbios_setenv("smbios.system.product", addr, 0x05); 293 smbios_setenv("smbios.system.version", addr, 0x06); 294 #ifdef SMBIOS_SERIAL_NUMBERS 295 smbios_setenv("smbios.system.serial", addr, 0x07); 296 smbios_setuuid("smbios.system.uuid", addr + 0x08); 297 #endif 298 if (smbios.major > 2 || 299 (smbios.major == 2 && smbios.minor >= 4)) { 300 smbios_setenv("smbios.system.sku", addr, 0x19); 301 smbios_setenv("smbios.system.family", addr, 0x1a); 302 } 303 break; 304 305 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */ 306 smbios_setenv("smbios.planar.maker", addr, 0x04); 307 smbios_setenv("smbios.planar.product", addr, 0x05); 308 smbios_setenv("smbios.planar.version", addr, 0x06); 309 #ifdef SMBIOS_SERIAL_NUMBERS 310 smbios_setenv("smbios.planar.serial", addr, 0x07); 311 smbios_setenv("smbios.planar.tag", addr, 0x08); 312 #endif 313 smbios_setenv("smbios.planar.location", addr, 0x0a); 314 break; 315 316 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */ 317 smbios_setenv("smbios.chassis.maker", addr, 0x04); 318 smbios_setenv("smbios.chassis.version", addr, 0x06); 319 #ifdef SMBIOS_SERIAL_NUMBERS 320 smbios_setenv("smbios.chassis.serial", addr, 0x07); 321 smbios_setenv("smbios.chassis.tag", addr, 0x08); 322 #endif 323 break; 324 325 case 4: /* 3.3.5 Processor Information (Type 4) */ 326 /* 327 * Offset 18h: Processor Status 328 * 329 * Bit 7 Reserved, must be 0 330 * Bit 6 CPU Socket Populated 331 * 1 - CPU Socket Populated 332 * 0 - CPU Socket Unpopulated 333 * Bit 5:3 Reserved, must be zero 334 * Bit 2:0 CPU Status 335 * 0h - Unknown 336 * 1h - CPU Enabled 337 * 2h - CPU Disabled by User via BIOS Setup 338 * 3h - CPU Disabled by BIOS (POST Error) 339 * 4h - CPU is Idle, waiting to be enabled 340 * 5-6h - Reserved 341 * 7h - Other 342 */ 343 proc = SMBIOS_GET8(addr, 0x18); 344 if ((proc & 0x07) == 1) 345 smbios.enabled_sockets++; 346 if ((proc & 0x40) != 0) 347 smbios.populated_sockets++; 348 break; 349 350 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */ 351 /* 352 * Offset 0Ah: Enabled Size 353 * 354 * Bit 7 Bank connection 355 * 1 - Double-bank connection 356 * 0 - Single-bank connection 357 * Bit 6:0 Size (n), where 2**n is the size in MB 358 * 7Dh - Not determinable (Installed Size only) 359 * 7Eh - Module is installed, but no memory 360 * has been enabled 361 * 7Fh - Not installed 362 */ 363 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f; 364 if (osize > 0 && osize < 22) 365 smbios.old_enabled_memory += 1 << (osize + 10); 366 break; 367 368 case 17: /* 3.3.18 Memory Device (Type 17) */ 369 /* 370 * Offset 0Ch: Size 371 * 372 * Bit 15 Granularity 373 * 1 - Value is in kilobytes units 374 * 0 - Value is in megabytes units 375 * Bit 14:0 Size 376 */ 377 size = SMBIOS_GET16(addr, 0x0c); 378 if (size != 0 && size != 0xffff) 379 smbios.enabled_memory += (size & 0x8000) != 0 ? 380 (size & 0x7fff) : (size << 10); 381 break; 382 383 default: /* skip other types */ 384 break; 385 } 386 387 /* Find structure terminator. */ 388 cp = SMBIOS_GETSTR(addr); 389 while (SMBIOS_GET16(cp, 0) != 0) 390 cp++; 391 392 return (cp + 2); 393 } 394 395 static caddr_t 396 smbios_find_struct(int type) 397 { 398 caddr_t dmi; 399 size_t i; 400 401 if (smbios.addr == NULL) 402 return (NULL); 403 404 for (dmi = smbios.addr, i = 0; 405 dmi < smbios.addr + smbios.length && i < smbios.count; i++) { 406 if (SMBIOS_GET8(dmi, 0) == type) 407 return (dmi); 408 /* Find structure terminator. */ 409 dmi = SMBIOS_GETSTR(dmi); 410 while (SMBIOS_GET16(dmi, 0) != 0) 411 dmi++; 412 dmi += 2; 413 } 414 415 return (NULL); 416 } 417 418 static caddr_t 419 smbios_probe(const caddr_t addr) 420 { 421 static caddr_t smbios_addr = NULL; 422 caddr_t info; 423 const caddr_t paddr = addr != NULL ? addr : ptov(SMBIOS_START); 424 425 if (smbios.probed) 426 return (smbios_addr); 427 smbios.probed = 1; 428 429 /* Search signatures and validate checksums. */ 430 smbios_addr = smbios_sigsearch(paddr, SMBIOS_LENGTH); 431 if (smbios.addr != NULL) { 432 /* Get system information from SMBIOS */ 433 info = smbios_find_struct(0x00); 434 if (info != NULL) { 435 smbios.bios_vendor = smbios_getstring(info, 0x04); 436 } 437 info = smbios_find_struct(0x01); 438 if (info != NULL) { 439 smbios.maker = smbios_getstring(info, 0x04); 440 smbios.product = smbios_getstring(info, 0x05); 441 } 442 } 443 return (smbios_addr); 444 } 445 446 void 447 smbios_detect(const caddr_t addr) 448 { 449 caddr_t smbios_addr; 450 char buf[20]; 451 caddr_t dmi; 452 size_t i; 453 454 smbios_addr = smbios_probe(addr); 455 if (smbios_addr == NULL) 456 return; 457 458 if (addr == 0) { 459 snprintf(buf, sizeof (buf), "0x%08jx", 460 (uintmax_t)vtop(smbios_addr)); 461 } else { 462 snprintf(buf, sizeof (buf), "0x%016jx", 463 (uintmax_t)vtop(smbios_addr)); 464 } 465 env_setenv("smbios-address", EV_VOLATILE, buf, env_noset, env_nounset); 466 467 for (dmi = smbios.addr, i = 0; 468 dmi < smbios.addr + smbios.length && i < smbios.count; i++) 469 dmi = smbios_parse_table(dmi); 470 471 sprintf(buf, "%d.%d", smbios.major, smbios.minor); 472 setenv("smbios.version", buf, 1); 473 if (smbios.enabled_memory > 0 || smbios.old_enabled_memory > 0) { 474 sprintf(buf, "%u", smbios.enabled_memory > 0 ? 475 smbios.enabled_memory : smbios.old_enabled_memory); 476 setenv("smbios.memory.enabled", buf, 1); 477 } 478 if (smbios.enabled_sockets > 0) { 479 sprintf(buf, "%u", smbios.enabled_sockets); 480 setenv("smbios.socket.enabled", buf, 1); 481 } 482 if (smbios.populated_sockets > 0) { 483 sprintf(buf, "%u", smbios.populated_sockets); 484 setenv("smbios.socket.populated", buf, 1); 485 } 486 } 487 488 static int 489 smbios_match_str(const char *s1, const char *s2) 490 { 491 return (s1 == NULL || (s2 != NULL && strcmp(s1, s2) == 0)); 492 } 493 494 int 495 smbios_match(const char *bios_vendor, const char *maker, 496 const char *product) 497 { 498 /* XXXRP currently, only called from non-EFI. */ 499 smbios_probe(NULL); 500 return (smbios_match_str(bios_vendor, smbios.bios_vendor) && 501 smbios_match_str(maker, smbios.maker) && 502 smbios_match_str(product, smbios.product)); 503 } 504