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, SMBIOS_DMI_SIG_LEN) == 0 112 && smbios_checksum(cp + 0x10, 0x0f) == 0) { 113 114 /* Structure Table Length */ 115 smbios.length = SMBIOS_GET16(cp, 0x16); 116 /* Structure Table Address */ 117 paddr = SMBIOS_GET32(cp, 0x18); 118 /* No of SMBIOS Structures */ 119 smbios.count = SMBIOS_GET16(cp, 0x1c); 120 /* SMBIOS BCD Revision */ 121 smbios.ver = SMBIOS_GET8(cp, 0x1e); 122 if (smbios.ver != 0) { 123 smbios.major = smbios.ver >> 4; 124 smbios.minor = smbios.ver & 0x0f; 125 if (smbios.major > 9 || smbios.minor > 9) 126 smbios.ver = 0; 127 } 128 if (smbios.ver == 0) { 129 /* SMBIOS Major Version */ 130 smbios.major = SMBIOS_GET8(cp, 0x06); 131 /* SMBIOS Minor Version */ 132 smbios.minor = SMBIOS_GET8(cp, 0x07); 133 } 134 smbios.ver = (smbios.major << 8) | smbios.minor; 135 smbios.addr = ptov(paddr); 136 return (cp); 137 } 138 #ifdef _LP64 139 /* 140 * Check for the SMBIOS 64-bit entry point introduced in 141 * version 3.0. 142 * 143 * The table address is a 64-bit physical address that may 144 * appear at any 64-bit address. We only search for 145 * the 64-bit entry point when running a 64-bit application. 146 */ 147 if (strncmp(cp, SMBIOS3_SIG, SMBIOS3_SIG_LEN) == 0 && 148 smbios_checksum(cp, SMBIOS_GET8(cp, 0x06)) == 0) { 149 150 /* SMBIOS Major Version */ 151 smbios.major = SMBIOS_GET8(cp, 0x07); 152 /* SMBIOS Minor Version */ 153 smbios.minor = SMBIOS_GET8(cp, 0x08); 154 /* Entry Point Revision */ 155 smbios.ver = SMBIOS_GET8(cp, 0x0a); 156 /* Structure Table maximum size */ 157 smbios.length = SMBIOS_GET32(cp, 0x0c); 158 /* Structure Table Address */ 159 paddr = SMBIOS_GET64(cp, 0x10); 160 smbios.addr = ptov(paddr); 161 /* 162 * Calculate upper limit for structure count, 163 * use size of table header (4 bytes). 164 */ 165 smbios.count = smbios.length / 4; 166 return (cp); 167 } 168 #endif 169 } 170 return (NULL); 171 } 172 173 static const char* 174 smbios_getstring(caddr_t addr, const int offset) 175 { 176 caddr_t cp; 177 int i, idx; 178 179 idx = SMBIOS_GET8(addr, offset); 180 if (idx != 0) { 181 cp = SMBIOS_GETSTR(addr); 182 for (i = 1; i < idx; i++) 183 cp += strlen(cp) + 1; 184 return cp; 185 } 186 return (NULL); 187 } 188 189 static void 190 smbios_setenv(const char *name, caddr_t addr, const int offset) 191 { 192 const char* val; 193 194 val = smbios_getstring(addr, offset); 195 if (val != NULL) 196 setenv(name, val, 1); 197 } 198 199 #ifdef SMBIOS_SERIAL_NUMBERS 200 201 #define UUID_SIZE 16 202 #define UUID_TYPE uint32_t 203 #define UUID_STEP sizeof(UUID_TYPE) 204 #define UUID_ALL_BITS (UUID_SIZE / UUID_STEP) 205 #define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off))) 206 207 static void 208 smbios_setuuid(const char *name, const caddr_t addr) 209 { 210 char uuid[37]; 211 int byteorder, i, ones, zeros; 212 UUID_TYPE n; 213 uint32_t f1; 214 uint16_t f2, f3; 215 216 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) { 217 n = UUID_GET(addr, i) + 1; 218 if (zeros == 0 && n == 0) 219 ones++; 220 else if (ones == 0 && n == 1) 221 zeros++; 222 else 223 break; 224 } 225 226 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) { 227 /* 228 * 3.3.2.1 System UUID 229 * 230 * "Although RFC 4122 recommends network byte order for all 231 * fields, the PC industry (including the ACPI, UEFI, and 232 * Microsoft specifications) has consistently used 233 * little-endian byte encoding for the first three fields: 234 * time_low, time_mid, time_hi_and_version. The same encoding, 235 * also known as wire format, should also be used for the 236 * SMBIOS representation of the UUID." 237 * 238 * Note: We use network byte order for backward compatibility 239 * unless SMBIOS version is 2.6+ or little-endian is forced. 240 */ 241 #if defined(SMBIOS_LITTLE_ENDIAN_UUID) 242 byteorder = LITTLE_ENDIAN; 243 #elif defined(SMBIOS_NETWORK_ENDIAN_UUID) 244 byteorder = BIG_ENDIAN; 245 #else 246 byteorder = ver < 0x0206 ? BIG_ENDIAN : LITTLE_ENDIAN; 247 #endif 248 if (byteorder != LITTLE_ENDIAN) { 249 f1 = ntohl(SMBIOS_GET32(addr, 0)); 250 f2 = ntohs(SMBIOS_GET16(addr, 4)); 251 f3 = ntohs(SMBIOS_GET16(addr, 6)); 252 } else { 253 f1 = le32toh(SMBIOS_GET32(addr, 0)); 254 f2 = le16toh(SMBIOS_GET16(addr, 4)); 255 f3 = le16toh(SMBIOS_GET16(addr, 6)); 256 } 257 sprintf(uuid, 258 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 259 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9), 260 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11), 261 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13), 262 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15)); 263 setenv(name, uuid, 1); 264 } 265 } 266 267 #undef UUID_SIZE 268 #undef UUID_TYPE 269 #undef UUID_STEP 270 #undef UUID_ALL_BITS 271 #undef UUID_GET 272 273 #endif 274 275 static caddr_t 276 smbios_parse_table(const caddr_t addr) 277 { 278 caddr_t cp; 279 int proc, size, osize, type; 280 281 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */ 282 switch(type) { 283 case 0: /* 3.3.1 BIOS Information (Type 0) */ 284 smbios_setenv("smbios.bios.vendor", addr, 0x04); 285 smbios_setenv("smbios.bios.version", addr, 0x05); 286 smbios_setenv("smbios.bios.reldate", addr, 0x08); 287 break; 288 289 case 1: /* 3.3.2 System Information (Type 1) */ 290 smbios_setenv("smbios.system.maker", addr, 0x04); 291 smbios_setenv("smbios.system.product", addr, 0x05); 292 smbios_setenv("smbios.system.version", addr, 0x06); 293 #ifdef SMBIOS_SERIAL_NUMBERS 294 smbios_setenv("smbios.system.serial", addr, 0x07); 295 smbios_setuuid("smbios.system.uuid", addr + 0x08); 296 #endif 297 if (smbios.major > 2 || 298 (smbios.major == 2 && smbios.minor >= 4)) { 299 smbios_setenv("smbios.system.sku", addr, 0x19); 300 smbios_setenv("smbios.system.family", addr, 0x1a); 301 } 302 break; 303 304 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */ 305 smbios_setenv("smbios.planar.maker", addr, 0x04); 306 smbios_setenv("smbios.planar.product", addr, 0x05); 307 smbios_setenv("smbios.planar.version", addr, 0x06); 308 #ifdef SMBIOS_SERIAL_NUMBERS 309 smbios_setenv("smbios.planar.serial", addr, 0x07); 310 smbios_setenv("smbios.planar.tag", addr, 0x08); 311 #endif 312 smbios_setenv("smbios.planar.location", addr, 0x0a); 313 break; 314 315 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */ 316 smbios_setenv("smbios.chassis.maker", addr, 0x04); 317 smbios_setenv("smbios.chassis.version", addr, 0x06); 318 #ifdef SMBIOS_SERIAL_NUMBERS 319 smbios_setenv("smbios.chassis.serial", addr, 0x07); 320 smbios_setenv("smbios.chassis.tag", addr, 0x08); 321 #endif 322 break; 323 324 case 4: /* 3.3.5 Processor Information (Type 4) */ 325 /* 326 * Offset 18h: Processor Status 327 * 328 * Bit 7 Reserved, must be 0 329 * Bit 6 CPU Socket Populated 330 * 1 - CPU Socket Populated 331 * 0 - CPU Socket Unpopulated 332 * Bit 5:3 Reserved, must be zero 333 * Bit 2:0 CPU Status 334 * 0h - Unknown 335 * 1h - CPU Enabled 336 * 2h - CPU Disabled by User via BIOS Setup 337 * 3h - CPU Disabled by BIOS (POST Error) 338 * 4h - CPU is Idle, waiting to be enabled 339 * 5-6h - Reserved 340 * 7h - Other 341 */ 342 proc = SMBIOS_GET8(addr, 0x18); 343 if ((proc & 0x07) == 1) 344 smbios.enabled_sockets++; 345 if ((proc & 0x40) != 0) 346 smbios.populated_sockets++; 347 break; 348 349 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */ 350 /* 351 * Offset 0Ah: Enabled Size 352 * 353 * Bit 7 Bank connection 354 * 1 - Double-bank connection 355 * 0 - Single-bank connection 356 * Bit 6:0 Size (n), where 2**n is the size in MB 357 * 7Dh - Not determinable (Installed Size only) 358 * 7Eh - Module is installed, but no memory 359 * has been enabled 360 * 7Fh - Not installed 361 */ 362 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f; 363 if (osize > 0 && osize < 22) 364 smbios.old_enabled_memory += 1 << (osize + 10); 365 break; 366 367 case 17: /* 3.3.18 Memory Device (Type 17) */ 368 /* 369 * Offset 0Ch: Size 370 * 371 * Bit 15 Granularity 372 * 1 - Value is in kilobytes units 373 * 0 - Value is in megabytes units 374 * Bit 14:0 Size 375 */ 376 size = SMBIOS_GET16(addr, 0x0c); 377 if (size != 0 && size != 0xffff) 378 smbios.enabled_memory += (size & 0x8000) != 0 ? 379 (size & 0x7fff) : (size << 10); 380 break; 381 382 default: /* skip other types */ 383 break; 384 } 385 386 /* Find structure terminator. */ 387 cp = SMBIOS_GETSTR(addr); 388 while (SMBIOS_GET16(cp, 0) != 0) 389 cp++; 390 391 return (cp + 2); 392 } 393 394 static caddr_t 395 smbios_find_struct(int type) 396 { 397 caddr_t dmi; 398 size_t i; 399 400 if (smbios.addr == NULL) 401 return (NULL); 402 403 for (dmi = smbios.addr, i = 0; 404 dmi < smbios.addr + smbios.length && i < smbios.count; i++) { 405 if (SMBIOS_GET8(dmi, 0) == type) 406 return dmi; 407 /* Find structure terminator. */ 408 dmi = SMBIOS_GETSTR(dmi); 409 while (SMBIOS_GET16(dmi, 0) != 0) 410 dmi++; 411 dmi += 2; 412 } 413 414 return (NULL); 415 } 416 417 static void 418 smbios_probe(const caddr_t addr) 419 { 420 caddr_t info; 421 const caddr_t paddr = addr != NULL ? addr : ptov(SMBIOS_START); 422 423 if (smbios.probed) 424 return; 425 smbios.probed = 1; 426 427 /* Search signatures and validate checksums. */ 428 if (smbios_sigsearch(paddr, SMBIOS_LENGTH) == NULL) 429 return; 430 431 /* Get system information from SMBIOS */ 432 info = smbios_find_struct(0x00); 433 if (info != NULL) { 434 smbios.bios_vendor = smbios_getstring(info, 0x04); 435 } 436 info = smbios_find_struct(0x01); 437 if (info != NULL) { 438 smbios.maker = smbios_getstring(info, 0x04); 439 smbios.product = smbios_getstring(info, 0x05); 440 } 441 } 442 443 void 444 smbios_detect(const caddr_t addr) 445 { 446 char buf[16]; 447 caddr_t dmi; 448 size_t i; 449 450 smbios_probe(addr); 451 if (smbios.addr == NULL) 452 return; 453 454 for (dmi = smbios.addr, i = 0; 455 dmi < smbios.addr + smbios.length && i < smbios.count; i++) 456 dmi = smbios_parse_table(dmi); 457 458 sprintf(buf, "%d.%d", smbios.major, smbios.minor); 459 setenv("smbios.version", buf, 1); 460 if (smbios.enabled_memory > 0 || smbios.old_enabled_memory > 0) { 461 sprintf(buf, "%u", smbios.enabled_memory > 0 ? 462 smbios.enabled_memory : smbios.old_enabled_memory); 463 setenv("smbios.memory.enabled", buf, 1); 464 } 465 if (smbios.enabled_sockets > 0) { 466 sprintf(buf, "%u", smbios.enabled_sockets); 467 setenv("smbios.socket.enabled", buf, 1); 468 } 469 if (smbios.populated_sockets > 0) { 470 sprintf(buf, "%u", smbios.populated_sockets); 471 setenv("smbios.socket.populated", buf, 1); 472 } 473 } 474 475 static int 476 smbios_match_str(const char* s1, const char* s2) 477 { 478 return (s1 == NULL || (s2 != NULL && !strcmp(s1, s2))); 479 } 480 481 int 482 smbios_match(const char* bios_vendor, const char* maker, 483 const char* product) 484 { 485 /* XXXRP currently, only called from non-EFI. */ 486 smbios_probe(NULL); 487 return (smbios_match_str(bios_vendor, smbios.bios_vendor) && 488 smbios_match_str(maker, smbios.maker) && 489 smbios_match_str(product, smbios.product)); 490 } 491