smbios.c revision 190814
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: head/sys/boot/i386/libi386/smbios.c 190814 2009-04-07 17:58:15Z jkim $"); 29 30#include <stand.h> 31#include <bootstrap.h> 32#include <sys/endian.h> 33 34#include "btxv86.h" 35#include "libi386.h" 36 37/* 38 * Detect SMBIOS and export information about the SMBIOS into the 39 * environment. 40 * 41 * System Management BIOS Reference Specification, v2.6 Final 42 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf 43 */ 44 45/* 46 * 2.1.1 SMBIOS Structure Table Entry Point 47 * 48 * "On non-EFI systems, the SMBIOS Entry Point structure, described below, can 49 * be located by application software by searching for the anchor-string on 50 * paragraph (16-byte) boundaries within the physical memory address range 51 * 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate anchor 52 * string that is used by some existing DMI browsers." 53 */ 54#define SMBIOS_START 0xf0000 55#define SMBIOS_LENGTH 0x10000 56#define SMBIOS_STEP 0x10 57#define SMBIOS_SIG "_SM_" 58#define SMBIOS_DMI_SIG "_DMI_" 59 60#define SMBIOS_GET8(base, off) (*(uint8_t *)((base) + (off))) 61#define SMBIOS_GET16(base, off) (*(uint16_t *)((base) + (off))) 62#define SMBIOS_GET32(base, off) (*(uint32_t *)((base) + (off))) 63 64#define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01) 65#define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base)) 66 67static uint32_t smbios_enabled_memory = 0; 68static uint32_t smbios_old_enabled_memory = 0; 69static uint8_t smbios_enabled_sockets = 0; 70static uint8_t smbios_populated_sockets = 0; 71 72static uint8_t 73smbios_checksum(const caddr_t addr, const uint8_t len) 74{ 75 uint8_t sum; 76 int i; 77 78 for (sum = 0, i = 0; i < len; i++) 79 sum += SMBIOS_GET8(addr, i); 80 return (sum); 81} 82 83static caddr_t 84smbios_sigsearch(const caddr_t addr, const uint32_t len) 85{ 86 caddr_t cp; 87 88 /* Search on 16-byte boundaries. */ 89 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP) 90 if (strncmp(cp, SMBIOS_SIG, 4) == 0 && 91 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 && 92 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5) == 0 && 93 smbios_checksum(cp + 0x10, 0x0f) == 0) 94 return (cp); 95 return (NULL); 96} 97 98static void 99smbios_setenv(const char *name, caddr_t addr, const int offset) 100{ 101 caddr_t cp; 102 int i, idx; 103 104 idx = SMBIOS_GET8(addr, offset); 105 if (idx != 0) { 106 cp = SMBIOS_GETSTR(addr); 107 for (i = 1; i < idx; i++) 108 cp += strlen(cp) + 1; 109 setenv(name, cp, 1); 110 } 111} 112 113#ifdef SMBIOS_SERIAL_NUMBERS 114 115#define UUID_SIZE 16 116#define UUID_TYPE uint32_t 117#define UUID_STEP sizeof(UUID_TYPE) 118#define UUID_ALL_BITS (UUID_SIZE / UUID_STEP) 119#define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off))) 120 121static void 122smbios_setuuid(const char *name, const caddr_t addr, const int ver) 123{ 124 char uuid[37]; 125 int i, ones, zeros; 126 UUID_TYPE n; 127 uint32_t f1; 128 uint16_t f2, f3; 129 130 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) { 131 n = UUID_GET(addr, i) + 1; 132 if (zeros == 0 && n == 0) 133 ones++; 134 else if (ones == 0 && n == 1) 135 zeros++; 136 else 137 break; 138 } 139 140 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) { 141 /* 142 * 3.3.2.1 System UUID 143 * 144 * "Although RFC 4122 recommends network byte order for all 145 * fields, the PC industry (including the ACPI, UEFI, and 146 * Microsoft specifications) has consistently used 147 * little-endian byte encoding for the first three fields: 148 * time_low, time_mid, time_hi_and_version. The same encoding, 149 * also known as wire format, should also be used for the 150 * SMBIOS representation of the UUID." 151 * 152 * Note: We use network byte order for backward compatibility 153 * unless SMBIOS version is 2.6+ or little-endian is forced. 154 */ 155#ifndef SMBIOS_LITTLE_ENDIAN_UUID 156 if (ver < 0x0206) { 157 f1 = ntohl(SMBIOS_GET32(addr, 0)); 158 f2 = ntohs(SMBIOS_GET16(addr, 4)); 159 f3 = ntohs(SMBIOS_GET16(addr, 6)); 160 } else 161#endif 162 { 163 f1 = le32toh(SMBIOS_GET32(addr, 0)); 164 f2 = le16toh(SMBIOS_GET16(addr, 4)); 165 f3 = le16toh(SMBIOS_GET16(addr, 6)); 166 } 167 sprintf(uuid, 168 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 169 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9), 170 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11), 171 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13), 172 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15)); 173 setenv(name, uuid, 1); 174 } 175} 176 177#undef UUID_SIZE 178#undef UUID_TYPE 179#undef UUID_STEP 180#undef UUID_ALL_BITS 181#undef UUID_GET 182 183#endif 184 185static caddr_t 186smbios_parse_table(const caddr_t addr, const int ver) 187{ 188 caddr_t cp; 189 int proc, size, osize, type; 190 191 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */ 192 switch(type) { 193 case 0: /* 3.3.1 BIOS Information (Type 0) */ 194 smbios_setenv("smbios.bios.vendor", addr, 0x04); 195 smbios_setenv("smbios.bios.version", addr, 0x05); 196 smbios_setenv("smbios.bios.reldate", addr, 0x08); 197 break; 198 199 case 1: /* 3.3.2 System Information (Type 1) */ 200 smbios_setenv("smbios.system.maker", addr, 0x04); 201 smbios_setenv("smbios.system.product", addr, 0x05); 202 smbios_setenv("smbios.system.version", addr, 0x06); 203#ifdef SMBIOS_SERIAL_NUMBERS 204 smbios_setenv("smbios.system.serial", addr, 0x07); 205 smbios_setuuid("smbios.system.uuid", addr + 0x08, ver); 206#endif 207 break; 208 209 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */ 210 smbios_setenv("smbios.planar.maker", addr, 0x04); 211 smbios_setenv("smbios.planar.product", addr, 0x05); 212 smbios_setenv("smbios.planar.version", addr, 0x06); 213#ifdef SMBIOS_SERIAL_NUMBERS 214 smbios_setenv("smbios.planar.serial", addr, 0x07); 215#endif 216 break; 217 218 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */ 219 smbios_setenv("smbios.chassis.maker", addr, 0x04); 220 smbios_setenv("smbios.chassis.version", addr, 0x06); 221#ifdef SMBIOS_SERIAL_NUMBERS 222 smbios_setenv("smbios.chassis.serial", addr, 0x07); 223 smbios_setenv("smbios.chassis.tag", addr, 0x08); 224#endif 225 break; 226 227 case 4: /* 3.3.5 Processor Information (Type 4) */ 228 /* 229 * Offset 18h: Processor Status 230 * 231 * Bit 7 Reserved, must be 0 232 * Bit 6 CPU Socket Populated 233 * 1 - CPU Socket Populated 234 * 0 - CPU Socket Unpopulated 235 * Bit 5:3 Reserved, must be zero 236 * Bit 2:0 CPU Status 237 * 0h - Unknown 238 * 1h - CPU Enabled 239 * 2h - CPU Disabled by User via BIOS Setup 240 * 3h - CPU Disabled by BIOS (POST Error) 241 * 4h - CPU is Idle, waiting to be enabled 242 * 5-6h - Reserved 243 * 7h - Other 244 */ 245 proc = SMBIOS_GET8(addr, 0x18); 246 if ((proc & 0x07) == 1) 247 smbios_enabled_sockets++; 248 if ((proc & 0x40) != 0) 249 smbios_populated_sockets++; 250 break; 251 252 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */ 253 /* 254 * Offset 0Ah: Enabled Size 255 * 256 * Bit 7 Bank connection 257 * 1 - Double-bank connection 258 * 0 - Single-bank connection 259 * Bit 6:0 Size (n), where 2**n is the size in MB 260 * 7Dh - Not determinable (Installed Size only) 261 * 7Eh - Module is installed, but no memory 262 * has been enabled 263 * 7Fh - Not installed 264 */ 265 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f; 266 if (osize > 0 && osize < 22) 267 smbios_old_enabled_memory += 1 << (osize + 10); 268 break; 269 270 case 17: /* 3.3.18 Memory Device (Type 17) */ 271 /* 272 * Offset 0Ch: Size 273 * 274 * Bit 15 Granularity 275 * 1 - Value is in kilobytes units 276 * 0 - Value is in megabytes units 277 * Bit 14:0 Size 278 */ 279 size = SMBIOS_GET16(addr, 0x0c); 280 if (size != 0 && size != 0xffff) 281 smbios_enabled_memory += (size & 0x8000) != 0 ? 282 (size & 0x7fff) : (size << 10); 283 break; 284 285 default: /* skip other types */ 286 break; 287 } 288 289 /* Find structure terminator. */ 290 cp = SMBIOS_GETSTR(addr); 291 while (SMBIOS_GET16(cp, 0) != 0) 292 cp++; 293 294 return (cp + 2); 295} 296 297void 298smbios_detect(void) 299{ 300 char buf[16]; 301 caddr_t addr, dmi, smbios; 302 size_t count, length; 303 uint32_t paddr; 304 int i, major, minor, ver; 305 306 /* Search signatures and validate checksums. */ 307 smbios = smbios_sigsearch(PTOV(SMBIOS_START), SMBIOS_LENGTH); 308 if (smbios == NULL) 309 return; 310 311 length = SMBIOS_GET16(smbios, 0x16); /* Structure Table Length */ 312 paddr = SMBIOS_GET32(smbios, 0x18); /* Structure Table Address */ 313 count = SMBIOS_GET16(smbios, 0x1c); /* No of SMBIOS Structures */ 314 ver = SMBIOS_GET8(smbios, 0x1e); /* SMBIOS BCD Revision */ 315 316 if (ver != 0) { 317 major = ver >> 4; 318 minor = ver & 0x0f; 319 if (major > 9 || minor > 9) 320 ver = 0; 321 } 322 if (ver == 0) { 323 major = SMBIOS_GET8(smbios, 0x06); /* SMBIOS Major Version */ 324 minor = SMBIOS_GET8(smbios, 0x07); /* SMBIOS Minor Version */ 325 } 326 ver = (major << 8) | minor; 327 328 addr = PTOV(paddr); 329 for (dmi = addr, i = 0; dmi < addr + length && i < count; i++) 330 dmi = smbios_parse_table(dmi, ver); 331 332 sprintf(buf, "%d.%d", major, minor); 333 setenv("smbios.version", buf, 1); 334 if (smbios_enabled_memory > 0 || smbios_old_enabled_memory > 0) { 335 sprintf(buf, "%u", smbios_enabled_memory > 0 ? 336 smbios_enabled_memory : smbios_old_enabled_memory); 337 setenv("smbios.memory.enabled", buf, 1); 338 } 339 if (smbios_enabled_sockets > 0) { 340 sprintf(buf, "%u", smbios_enabled_sockets); 341 setenv("smbios.socket.enabled", buf, 1); 342 } 343 if (smbios_populated_sockets > 0) { 344 sprintf(buf, "%u", smbios_populated_sockets); 345 setenv("smbios.socket.populated", buf, 1); 346 } 347} 348