smbios.c revision 285726
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__FBSDID("$FreeBSD: stable/10/sys/boot/i386/libi386/smbios.c 285726 2015-07-20 22:14:55Z allanjude $"); 29 30#include <stand.h> 31#include <bootstrap.h> 32#include <sys/endian.h> 33 34#ifdef EFI 35/* In EFI, we don't need PTOV(). */ 36#define PTOV(x) (caddr_t)(x) 37#else 38#include "btxv86.h" 39#endif 40#include "smbios.h" 41 42/* 43 * Detect SMBIOS and export information about the SMBIOS into the 44 * environment. 45 * 46 * System Management BIOS Reference Specification, v2.6 Final 47 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf 48 */ 49 50/* 51 * 2.1.1 SMBIOS Structure Table Entry Point 52 * 53 * "On non-EFI systems, the SMBIOS Entry Point structure, described below, can 54 * be located by application software by searching for the anchor-string on 55 * paragraph (16-byte) boundaries within the physical memory address range 56 * 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate anchor 57 * string that is used by some existing DMI browsers." 58 */ 59#define SMBIOS_START 0xf0000 60#define SMBIOS_LENGTH 0x10000 61#define SMBIOS_STEP 0x10 62#define SMBIOS_SIG "_SM_" 63#define SMBIOS_DMI_SIG "_DMI_" 64 65#define SMBIOS_GET8(base, off) (*(uint8_t *)((base) + (off))) 66#define SMBIOS_GET16(base, off) (*(uint16_t *)((base) + (off))) 67#define SMBIOS_GET32(base, off) (*(uint32_t *)((base) + (off))) 68 69#define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01) 70#define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base)) 71 72struct smbios_attr { 73 int probed; 74 caddr_t addr; 75 size_t length; 76 size_t count; 77 int major; 78 int minor; 79 int ver; 80 const char* bios_vendor; 81 const char* maker; 82 const char* product; 83 uint32_t enabled_memory; 84 uint32_t old_enabled_memory; 85 uint8_t enabled_sockets; 86 uint8_t populated_sockets; 87}; 88 89static struct smbios_attr smbios; 90 91static uint8_t 92smbios_checksum(const caddr_t addr, const uint8_t len) 93{ 94 uint8_t sum; 95 int i; 96 97 for (sum = 0, i = 0; i < len; i++) 98 sum += SMBIOS_GET8(addr, i); 99 return (sum); 100} 101 102static caddr_t 103smbios_sigsearch(const caddr_t addr, const uint32_t len) 104{ 105 caddr_t cp; 106 107 /* Search on 16-byte boundaries. */ 108 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP) 109 if (strncmp(cp, SMBIOS_SIG, 4) == 0 && 110 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 && 111 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5) == 0 && 112 smbios_checksum(cp + 0x10, 0x0f) == 0) 113 return (cp); 114 return (NULL); 115} 116 117static const char* 118smbios_getstring(caddr_t addr, const int offset) 119{ 120 caddr_t cp; 121 int i, idx; 122 123 idx = SMBIOS_GET8(addr, offset); 124 if (idx != 0) { 125 cp = SMBIOS_GETSTR(addr); 126 for (i = 1; i < idx; i++) 127 cp += strlen(cp) + 1; 128 return cp; 129 } 130 return (NULL); 131} 132 133static void 134smbios_setenv(const char *name, caddr_t addr, const int offset) 135{ 136 const char* val; 137 138 val = smbios_getstring(addr, offset); 139 if (val != NULL) 140 setenv(name, val, 1); 141} 142 143#ifdef SMBIOS_SERIAL_NUMBERS 144 145#define UUID_SIZE 16 146#define UUID_TYPE uint32_t 147#define UUID_STEP sizeof(UUID_TYPE) 148#define UUID_ALL_BITS (UUID_SIZE / UUID_STEP) 149#define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off))) 150 151static void 152smbios_setuuid(const char *name, const caddr_t addr, const int ver) 153{ 154 char uuid[37]; 155 int i, ones, zeros; 156 UUID_TYPE n; 157 uint32_t f1; 158 uint16_t f2, f3; 159 160 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) { 161 n = UUID_GET(addr, i) + 1; 162 if (zeros == 0 && n == 0) 163 ones++; 164 else if (ones == 0 && n == 1) 165 zeros++; 166 else 167 break; 168 } 169 170 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) { 171 /* 172 * 3.3.2.1 System UUID 173 * 174 * "Although RFC 4122 recommends network byte order for all 175 * fields, the PC industry (including the ACPI, UEFI, and 176 * Microsoft specifications) has consistently used 177 * little-endian byte encoding for the first three fields: 178 * time_low, time_mid, time_hi_and_version. The same encoding, 179 * also known as wire format, should also be used for the 180 * SMBIOS representation of the UUID." 181 * 182 * Note: We use network byte order for backward compatibility 183 * unless SMBIOS version is 2.6+ or little-endian is forced. 184 */ 185#ifndef SMBIOS_LITTLE_ENDIAN_UUID 186 if (ver < 0x0206) { 187 f1 = ntohl(SMBIOS_GET32(addr, 0)); 188 f2 = ntohs(SMBIOS_GET16(addr, 4)); 189 f3 = ntohs(SMBIOS_GET16(addr, 6)); 190 } else 191#endif 192 { 193 f1 = le32toh(SMBIOS_GET32(addr, 0)); 194 f2 = le16toh(SMBIOS_GET16(addr, 4)); 195 f3 = le16toh(SMBIOS_GET16(addr, 6)); 196 } 197 sprintf(uuid, 198 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 199 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9), 200 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11), 201 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13), 202 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15)); 203 setenv(name, uuid, 1); 204 } 205} 206 207#undef UUID_SIZE 208#undef UUID_TYPE 209#undef UUID_STEP 210#undef UUID_ALL_BITS 211#undef UUID_GET 212 213#endif 214 215static caddr_t 216smbios_parse_table(const caddr_t addr) 217{ 218 caddr_t cp; 219 int proc, size, osize, type; 220 221 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */ 222 switch(type) { 223 case 0: /* 3.3.1 BIOS Information (Type 0) */ 224 smbios_setenv("smbios.bios.vendor", addr, 0x04); 225 smbios_setenv("smbios.bios.version", addr, 0x05); 226 smbios_setenv("smbios.bios.reldate", addr, 0x08); 227 break; 228 229 case 1: /* 3.3.2 System Information (Type 1) */ 230 smbios_setenv("smbios.system.maker", addr, 0x04); 231 smbios_setenv("smbios.system.product", addr, 0x05); 232 smbios_setenv("smbios.system.version", addr, 0x06); 233#ifdef SMBIOS_SERIAL_NUMBERS 234 smbios_setenv("smbios.system.serial", addr, 0x07); 235 smbios_setuuid("smbios.system.uuid", addr + 0x08, smbios.ver); 236#endif 237 break; 238 239 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */ 240 smbios_setenv("smbios.planar.maker", addr, 0x04); 241 smbios_setenv("smbios.planar.product", addr, 0x05); 242 smbios_setenv("smbios.planar.version", addr, 0x06); 243#ifdef SMBIOS_SERIAL_NUMBERS 244 smbios_setenv("smbios.planar.serial", addr, 0x07); 245#endif 246 break; 247 248 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */ 249 smbios_setenv("smbios.chassis.maker", addr, 0x04); 250 smbios_setenv("smbios.chassis.version", addr, 0x06); 251#ifdef SMBIOS_SERIAL_NUMBERS 252 smbios_setenv("smbios.chassis.serial", addr, 0x07); 253 smbios_setenv("smbios.chassis.tag", addr, 0x08); 254#endif 255 break; 256 257 case 4: /* 3.3.5 Processor Information (Type 4) */ 258 /* 259 * Offset 18h: Processor Status 260 * 261 * Bit 7 Reserved, must be 0 262 * Bit 6 CPU Socket Populated 263 * 1 - CPU Socket Populated 264 * 0 - CPU Socket Unpopulated 265 * Bit 5:3 Reserved, must be zero 266 * Bit 2:0 CPU Status 267 * 0h - Unknown 268 * 1h - CPU Enabled 269 * 2h - CPU Disabled by User via BIOS Setup 270 * 3h - CPU Disabled by BIOS (POST Error) 271 * 4h - CPU is Idle, waiting to be enabled 272 * 5-6h - Reserved 273 * 7h - Other 274 */ 275 proc = SMBIOS_GET8(addr, 0x18); 276 if ((proc & 0x07) == 1) 277 smbios.enabled_sockets++; 278 if ((proc & 0x40) != 0) 279 smbios.populated_sockets++; 280 break; 281 282 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */ 283 /* 284 * Offset 0Ah: Enabled Size 285 * 286 * Bit 7 Bank connection 287 * 1 - Double-bank connection 288 * 0 - Single-bank connection 289 * Bit 6:0 Size (n), where 2**n is the size in MB 290 * 7Dh - Not determinable (Installed Size only) 291 * 7Eh - Module is installed, but no memory 292 * has been enabled 293 * 7Fh - Not installed 294 */ 295 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f; 296 if (osize > 0 && osize < 22) 297 smbios.old_enabled_memory += 1 << (osize + 10); 298 break; 299 300 case 17: /* 3.3.18 Memory Device (Type 17) */ 301 /* 302 * Offset 0Ch: Size 303 * 304 * Bit 15 Granularity 305 * 1 - Value is in kilobytes units 306 * 0 - Value is in megabytes units 307 * Bit 14:0 Size 308 */ 309 size = SMBIOS_GET16(addr, 0x0c); 310 if (size != 0 && size != 0xffff) 311 smbios.enabled_memory += (size & 0x8000) != 0 ? 312 (size & 0x7fff) : (size << 10); 313 break; 314 315 default: /* skip other types */ 316 break; 317 } 318 319 /* Find structure terminator. */ 320 cp = SMBIOS_GETSTR(addr); 321 while (SMBIOS_GET16(cp, 0) != 0) 322 cp++; 323 324 return (cp + 2); 325} 326 327static caddr_t 328smbios_find_struct(int type) 329{ 330 caddr_t dmi; 331 int i; 332 333 if (smbios.addr == NULL) 334 return (NULL); 335 336 for (dmi = smbios.addr, i = 0; 337 dmi < smbios.addr + smbios.length && i < smbios.count; i++) { 338 if (SMBIOS_GET8(dmi, 0) == type) 339 return dmi; 340 /* Find structure terminator. */ 341 dmi = SMBIOS_GETSTR(dmi); 342 while (SMBIOS_GET16(dmi, 0) != 0) 343 dmi++; 344 dmi += 2; 345 } 346 347 return (NULL); 348} 349 350static void 351smbios_probe(const caddr_t addr) 352{ 353 caddr_t saddr, info; 354 uintptr_t paddr; 355 356 if (smbios.probed) 357 return; 358 smbios.probed = 1; 359 360 /* Search signatures and validate checksums. */ 361 saddr = smbios_sigsearch(addr ? addr : PTOV(SMBIOS_START), 362 SMBIOS_LENGTH); 363 if (saddr == NULL) 364 return; 365 366 smbios.length = SMBIOS_GET16(saddr, 0x16); /* Structure Table Length */ 367 paddr = SMBIOS_GET32(saddr, 0x18); /* Structure Table Address */ 368 smbios.count = SMBIOS_GET16(saddr, 0x1c); /* No of SMBIOS Structures */ 369 smbios.ver = SMBIOS_GET8(saddr, 0x1e); /* SMBIOS BCD Revision */ 370 371 if (smbios.ver != 0) { 372 smbios.major = smbios.ver >> 4; 373 smbios.minor = smbios.ver & 0x0f; 374 if (smbios.major > 9 || smbios.minor > 9) 375 smbios.ver = 0; 376 } 377 if (smbios.ver == 0) { 378 smbios.major = SMBIOS_GET8(saddr, 0x06);/* SMBIOS Major Version */ 379 smbios.minor = SMBIOS_GET8(saddr, 0x07);/* SMBIOS Minor Version */ 380 } 381 smbios.ver = (smbios.major << 8) | smbios.minor; 382 smbios.addr = PTOV(paddr); 383 384 /* Get system information from SMBIOS */ 385 info = smbios_find_struct(0x00); 386 if (info != NULL) { 387 smbios.bios_vendor = smbios_getstring(info, 0x04); 388 } 389 info = smbios_find_struct(0x01); 390 if (info != NULL) { 391 smbios.maker = smbios_getstring(info, 0x04); 392 smbios.product = smbios_getstring(info, 0x05); 393 } 394} 395 396void 397smbios_detect(const caddr_t addr) 398{ 399 char buf[16]; 400 caddr_t dmi; 401 int i; 402 403 smbios_probe(addr); 404 if (smbios.addr == NULL) 405 return; 406 407 for (dmi = smbios.addr, i = 0; 408 dmi < smbios.addr + smbios.length && i < smbios.count; i++) 409 dmi = smbios_parse_table(dmi); 410 411 sprintf(buf, "%d.%d", smbios.major, smbios.minor); 412 setenv("smbios.version", buf, 1); 413 if (smbios.enabled_memory > 0 || smbios.old_enabled_memory > 0) { 414 sprintf(buf, "%u", smbios.enabled_memory > 0 ? 415 smbios.enabled_memory : smbios.old_enabled_memory); 416 setenv("smbios.memory.enabled", buf, 1); 417 } 418 if (smbios.enabled_sockets > 0) { 419 sprintf(buf, "%u", smbios.enabled_sockets); 420 setenv("smbios.socket.enabled", buf, 1); 421 } 422 if (smbios.populated_sockets > 0) { 423 sprintf(buf, "%u", smbios.populated_sockets); 424 setenv("smbios.socket.populated", buf, 1); 425 } 426} 427 428static int 429smbios_match_str(const char* s1, const char* s2) 430{ 431 return (s1 == NULL || (s2 != NULL && !strcmp(s1, s2))); 432} 433 434int 435smbios_match(const char* bios_vendor, const char* maker, 436 const char* product) 437{ 438 /* XXXRP currently, only called from non-EFI. */ 439 smbios_probe(NULL); 440 return (smbios_match_str(bios_vendor, smbios.bios_vendor) && 441 smbios_match_str(maker, smbios.maker) && 442 smbios_match_str(product, smbios.product)); 443} 444