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 * $FreeBSD: src/sys/boot/i386/libi386/smbios.c,v 1.10 2009/04/07 17:58:15 jkim Exp $ 27 */ 28 29 #include <stand.h> 30 #include <bootstrap.h> 31 #include <sys/endian.h> 32 33 #ifdef EFI 34 /* In EFI, we don't need PTOV(). */ 35 #define PTOV(x) (caddr_t)(uintptr_t)(x) 36 #else 37 #include "btxv86.h" 38 #endif 39 #include "smbios.h" 40 41 /* 42 * Detect SMBIOS and export information about the SMBIOS into the 43 * environment. 44 * 45 * System Management BIOS Reference Specification, v2.6 Final 46 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf 47 */ 48 49 /* 50 * 2.1.1 SMBIOS Structure Table Entry Point 51 * 52 * "On non-EFI systems, the SMBIOS Entry Point structure, described below, can 53 * be located by application software by searching for the anchor-string on 54 * paragraph (16-byte) boundaries within the physical memory address range 55 * 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate anchor 56 * string that is used by some existing DMI browsers." 57 */ 58 #define SMBIOS_START 0xf0000 59 #define SMBIOS_LENGTH 0x10000 60 #define SMBIOS_STEP 0x10 61 #define SMBIOS_SIG "_SM_" 62 #define SMBIOS_DMI_SIG "_DMI_" 63 64 #define SMBIOS_GET8(base, off) (*(uint8_t *)((base) + (off))) 65 #define SMBIOS_GET16(base, off) (*(uint16_t *)((base) + (off))) 66 #define SMBIOS_GET32(base, off) (*(uint32_t *)((base) + (off))) 67 68 #define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01) 69 #define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base)) 70 71 static uint32_t smbios_enabled_memory = 0; 72 static uint32_t smbios_old_enabled_memory = 0; 73 static uint8_t smbios_enabled_sockets = 0; 74 static uint8_t smbios_populated_sockets = 0; 75 76 static uint8_t 77 smbios_checksum(const caddr_t addr, const uint8_t len) 78 { 79 uint8_t sum; 80 int i; 81 82 for (sum = 0, i = 0; i < len; i++) 83 sum += SMBIOS_GET8(addr, i); 84 return (sum); 85 } 86 87 static caddr_t 88 smbios_sigsearch(const caddr_t addr, const uint32_t len) 89 { 90 caddr_t cp; 91 92 /* Search on 16-byte boundaries. */ 93 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP) 94 if (strncmp(cp, SMBIOS_SIG, 4) == 0 && 95 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 && 96 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5) == 0 && 97 smbios_checksum(cp + 0x10, 0x0f) == 0) 98 return (cp); 99 return (NULL); 100 } 101 102 static void 103 smbios_setenv(const char *name, caddr_t addr, const int offset) 104 { 105 caddr_t cp; 106 int i, idx; 107 108 idx = SMBIOS_GET8(addr, offset); 109 if (idx != 0) { 110 cp = SMBIOS_GETSTR(addr); 111 for (i = 1; i < idx; i++) 112 cp += strlen(cp) + 1; 113 setenv(name, cp, 1); 114 } 115 } 116 117 #ifdef SMBIOS_SERIAL_NUMBERS 118 119 #define UUID_SIZE 16 120 #define UUID_TYPE uint32_t 121 #define UUID_STEP sizeof(UUID_TYPE) 122 #define UUID_ALL_BITS (UUID_SIZE / UUID_STEP) 123 #define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off))) 124 125 static void 126 smbios_setuuid(const char *name, const caddr_t addr, const int ver) 127 { 128 char uuid[37]; 129 int i, ones, zeros; 130 UUID_TYPE n; 131 uint32_t f1; 132 uint16_t f2, f3; 133 134 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) { 135 n = UUID_GET(addr, i) + 1; 136 if (zeros == 0 && n == 0) 137 ones++; 138 else if (ones == 0 && n == 1) 139 zeros++; 140 else 141 break; 142 } 143 144 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) { 145 /* 146 * 3.3.2.1 System UUID 147 * 148 * "Although RFC 4122 recommends network byte order for all 149 * fields, the PC industry (including the ACPI, UEFI, and 150 * Microsoft specifications) has consistently used 151 * little-endian byte encoding for the first three fields: 152 * time_low, time_mid, time_hi_and_version. The same encoding, 153 * also known as wire format, should also be used for the 154 * SMBIOS representation of the UUID." 155 * 156 * Note: We use network byte order for backward compatibility 157 * unless SMBIOS version is 2.6+ or little-endian is forced. 158 */ 159 #ifndef SMBIOS_LITTLE_ENDIAN_UUID 160 if (ver < 0x0206) { 161 f1 = ntohl(SMBIOS_GET32(addr, 0)); 162 f2 = ntohs(SMBIOS_GET16(addr, 4)); 163 f3 = ntohs(SMBIOS_GET16(addr, 6)); 164 } else 165 #endif 166 { 167 f1 = le32toh(SMBIOS_GET32(addr, 0)); 168 f2 = le16toh(SMBIOS_GET16(addr, 4)); 169 f3 = le16toh(SMBIOS_GET16(addr, 6)); 170 } 171 sprintf(uuid, 172 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", 173 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9), 174 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11), 175 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13), 176 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15)); 177 setenv(name, uuid, 1); 178 } 179 } 180 181 #undef UUID_SIZE 182 #undef UUID_TYPE 183 #undef UUID_STEP 184 #undef UUID_ALL_BITS 185 #undef UUID_GET 186 187 #endif 188 189 static caddr_t 190 smbios_parse_table(const caddr_t addr, const int ver) 191 { 192 caddr_t cp; 193 int proc, size, osize, type; 194 195 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */ 196 switch(type) { 197 case 0: /* 3.3.1 BIOS Information (Type 0) */ 198 smbios_setenv("smbios.bios.vendor", addr, 0x04); 199 smbios_setenv("smbios.bios.version", addr, 0x05); 200 smbios_setenv("smbios.bios.reldate", addr, 0x08); 201 break; 202 203 case 1: /* 3.3.2 System Information (Type 1) */ 204 smbios_setenv("smbios.system.maker", addr, 0x04); 205 smbios_setenv("smbios.system.product", addr, 0x05); 206 smbios_setenv("smbios.system.version", addr, 0x06); 207 #ifdef SMBIOS_SERIAL_NUMBERS 208 smbios_setenv("smbios.system.serial", addr, 0x07); 209 smbios_setuuid("smbios.system.uuid", addr + 0x08, ver); 210 #endif 211 break; 212 213 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */ 214 smbios_setenv("smbios.planar.maker", addr, 0x04); 215 smbios_setenv("smbios.planar.product", addr, 0x05); 216 smbios_setenv("smbios.planar.version", addr, 0x06); 217 #ifdef SMBIOS_SERIAL_NUMBERS 218 smbios_setenv("smbios.planar.serial", addr, 0x07); 219 #endif 220 break; 221 222 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */ 223 smbios_setenv("smbios.chassis.maker", addr, 0x04); 224 smbios_setenv("smbios.chassis.version", addr, 0x06); 225 #ifdef SMBIOS_SERIAL_NUMBERS 226 smbios_setenv("smbios.chassis.serial", addr, 0x07); 227 smbios_setenv("smbios.chassis.tag", addr, 0x08); 228 #endif 229 break; 230 231 case 4: /* 3.3.5 Processor Information (Type 4) */ 232 /* 233 * Offset 18h: Processor Status 234 * 235 * Bit 7 Reserved, must be 0 236 * Bit 6 CPU Socket Populated 237 * 1 - CPU Socket Populated 238 * 0 - CPU Socket Unpopulated 239 * Bit 5:3 Reserved, must be zero 240 * Bit 2:0 CPU Status 241 * 0h - Unknown 242 * 1h - CPU Enabled 243 * 2h - CPU Disabled by User via BIOS Setup 244 * 3h - CPU Disabled by BIOS (POST Error) 245 * 4h - CPU is Idle, waiting to be enabled 246 * 5-6h - Reserved 247 * 7h - Other 248 */ 249 proc = SMBIOS_GET8(addr, 0x18); 250 if ((proc & 0x07) == 1) 251 smbios_enabled_sockets++; 252 if ((proc & 0x40) != 0) 253 smbios_populated_sockets++; 254 break; 255 256 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */ 257 /* 258 * Offset 0Ah: Enabled Size 259 * 260 * Bit 7 Bank connection 261 * 1 - Double-bank connection 262 * 0 - Single-bank connection 263 * Bit 6:0 Size (n), where 2**n is the size in MB 264 * 7Dh - Not determinable (Installed Size only) 265 * 7Eh - Module is installed, but no memory 266 * has been enabled 267 * 7Fh - Not installed 268 */ 269 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f; 270 if (osize > 0 && osize < 22) 271 smbios_old_enabled_memory += 1 << (osize + 10); 272 break; 273 274 case 17: /* 3.3.18 Memory Device (Type 17) */ 275 /* 276 * Offset 0Ch: Size 277 * 278 * Bit 15 Granularity 279 * 1 - Value is in kilobytes units 280 * 0 - Value is in megabytes units 281 * Bit 14:0 Size 282 */ 283 size = SMBIOS_GET16(addr, 0x0c); 284 if (size != 0 && size != 0xffff) 285 smbios_enabled_memory += (size & 0x8000) != 0 ? 286 (size & 0x7fff) : (size << 10); 287 break; 288 289 default: /* skip other types */ 290 break; 291 } 292 293 /* Find structure terminator. */ 294 cp = SMBIOS_GETSTR(addr); 295 while (SMBIOS_GET16(cp, 0) != 0) 296 cp++; 297 298 return (cp + 2); 299 } 300 301 void 302 smbios_detect(const caddr_t addr) 303 { 304 char buf[32]; 305 caddr_t vaddr, dmi, smbios; 306 size_t count, length; 307 uint32_t paddr; 308 int major, minor, ver; 309 unsigned int i; 310 311 /* Search signatures and validate checksums. */ 312 smbios = smbios_sigsearch(addr ? addr : PTOV(SMBIOS_START), 313 SMBIOS_LENGTH); 314 if (smbios == NULL) 315 return; 316 317 /* 318 * Export the SMBIOS entry point via kenv so that the SMBIOS table can 319 * be found (e.g., by dmidecode(8)) in UEFI-only mode, where the BIOS 320 * is not mapped into the standard address space. 321 */ 322 sprintf(buf, "%p", smbios); 323 setenv("hint.smbios.0.mem", buf, 1); 324 325 length = SMBIOS_GET16(smbios, 0x16); /* Structure Table Length */ 326 paddr = SMBIOS_GET32(smbios, 0x18); /* Structure Table Address */ 327 count = SMBIOS_GET16(smbios, 0x1c); /* No of SMBIOS Structures */ 328 ver = SMBIOS_GET8(smbios, 0x1e); /* SMBIOS BCD Revision */ 329 330 if (ver != 0) { 331 major = ver >> 4; 332 minor = ver & 0x0f; 333 if (major > 9 || minor > 9) 334 ver = 0; 335 } 336 if (ver == 0) { 337 major = SMBIOS_GET8(smbios, 0x06); /* SMBIOS Major Version */ 338 minor = SMBIOS_GET8(smbios, 0x07); /* SMBIOS Minor Version */ 339 } 340 ver = (major << 8) | minor; 341 342 vaddr = PTOV(paddr); 343 for (dmi = vaddr, i = 0; dmi < vaddr + length && i < count; i++) 344 dmi = smbios_parse_table(dmi, ver); 345 346 sprintf(buf, "%d.%d", major, minor); 347 setenv("smbios.version", buf, 1); 348 if (smbios_enabled_memory > 0 || smbios_old_enabled_memory > 0) { 349 sprintf(buf, "%u", smbios_enabled_memory > 0 ? 350 smbios_enabled_memory : smbios_old_enabled_memory); 351 setenv("smbios.memory.enabled", buf, 1); 352 } 353 if (smbios_enabled_sockets > 0) { 354 sprintf(buf, "%u", smbios_enabled_sockets); 355 setenv("smbios.socket.enabled", buf, 1); 356 } 357 if (smbios_populated_sockets > 0) { 358 sprintf(buf, "%u", smbios_populated_sockets); 359 setenv("smbios.socket.populated", buf, 1); 360 } 361 } 362