2 * Copyright (c) 2005-2009 Jung-uk Kim <jkim@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/boot/i386/libi386/smbios.c,v 1.10 2009/04/07 17:58:15 jkim Exp $
30 #include <bootstrap.h>
31 #include <sys/endian.h>
37 * Detect SMBIOS and export information about the SMBIOS into the
40 * System Management BIOS Reference Specification, v2.6 Final
41 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf
45 * 2.1.1 SMBIOS Structure Table Entry Point
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."
53 #define SMBIOS_START 0xf0000
54 #define SMBIOS_LENGTH 0x10000
55 #define SMBIOS_STEP 0x10
56 #define SMBIOS_SIG "_SM_"
57 #define SMBIOS_DMI_SIG "_DMI_"
59 #define SMBIOS_GET8(base, off) (*(uint8_t *)((base) + (off)))
60 #define SMBIOS_GET16(base, off) (*(uint16_t *)((base) + (off)))
61 #define SMBIOS_GET32(base, off) (*(uint32_t *)((base) + (off)))
63 #define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01)
64 #define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base))
66 static uint32_t smbios_enabled_memory = 0;
67 static uint32_t smbios_old_enabled_memory = 0;
68 static uint8_t smbios_enabled_sockets = 0;
69 static uint8_t smbios_populated_sockets = 0;
72 smbios_checksum(const caddr_t addr, const uint8_t len)
77 for (sum = 0, i = 0; i < len; i++)
78 sum += SMBIOS_GET8(addr, i);
83 smbios_sigsearch(const caddr_t addr, const uint32_t len)
87 /* Search on 16-byte boundaries. */
88 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP)
89 if (strncmp(cp, SMBIOS_SIG, 4) == 0 &&
90 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 &&
91 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5) == 0 &&
92 smbios_checksum(cp + 0x10, 0x0f) == 0)
98 smbios_setenv(const char *name, caddr_t addr, const int offset)
103 idx = SMBIOS_GET8(addr, offset);
105 cp = SMBIOS_GETSTR(addr);
106 for (i = 1; i < idx; i++)
107 cp += strlen(cp) + 1;
112 #ifdef SMBIOS_SERIAL_NUMBERS
115 #define UUID_TYPE uint32_t
116 #define UUID_STEP sizeof(UUID_TYPE)
117 #define UUID_ALL_BITS (UUID_SIZE / UUID_STEP)
118 #define UUID_GET(base, off) (*(UUID_TYPE *)((base) + (off)))
121 smbios_setuuid(const char *name, const caddr_t addr, const int ver)
129 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) {
130 n = UUID_GET(addr, i) + 1;
131 if (zeros == 0 && n == 0)
133 else if (ones == 0 && n == 1)
139 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) {
141 * 3.3.2.1 System UUID
143 * "Although RFC 4122 recommends network byte order for all
144 * fields, the PC industry (including the ACPI, UEFI, and
145 * Microsoft specifications) has consistently used
146 * little-endian byte encoding for the first three fields:
147 * time_low, time_mid, time_hi_and_version. The same encoding,
148 * also known as wire format, should also be used for the
149 * SMBIOS representation of the UUID."
151 * Note: We use network byte order for backward compatibility
152 * unless SMBIOS version is 2.6+ or little-endian is forced.
154 #ifndef SMBIOS_LITTLE_ENDIAN_UUID
156 f1 = ntohl(SMBIOS_GET32(addr, 0));
157 f2 = ntohs(SMBIOS_GET16(addr, 4));
158 f3 = ntohs(SMBIOS_GET16(addr, 6));
162 f1 = le32toh(SMBIOS_GET32(addr, 0));
163 f2 = le16toh(SMBIOS_GET16(addr, 4));
164 f3 = le16toh(SMBIOS_GET16(addr, 6));
167 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
168 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9),
169 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11),
170 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13),
171 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15));
172 setenv(name, uuid, 1);
185 smbios_parse_table(const caddr_t addr, const int ver)
188 int proc, size, osize, type;
190 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */
192 case 0: /* 3.3.1 BIOS Information (Type 0) */
193 smbios_setenv("smbios.bios.vendor", addr, 0x04);
194 smbios_setenv("smbios.bios.version", addr, 0x05);
195 smbios_setenv("smbios.bios.reldate", addr, 0x08);
198 case 1: /* 3.3.2 System Information (Type 1) */
199 smbios_setenv("smbios.system.maker", addr, 0x04);
200 smbios_setenv("smbios.system.product", addr, 0x05);
201 smbios_setenv("smbios.system.version", addr, 0x06);
202 #ifdef SMBIOS_SERIAL_NUMBERS
203 smbios_setenv("smbios.system.serial", addr, 0x07);
204 smbios_setuuid("smbios.system.uuid", addr + 0x08, ver);
208 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */
209 smbios_setenv("smbios.planar.maker", addr, 0x04);
210 smbios_setenv("smbios.planar.product", addr, 0x05);
211 smbios_setenv("smbios.planar.version", addr, 0x06);
212 #ifdef SMBIOS_SERIAL_NUMBERS
213 smbios_setenv("smbios.planar.serial", addr, 0x07);
217 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */
218 smbios_setenv("smbios.chassis.maker", addr, 0x04);
219 smbios_setenv("smbios.chassis.version", addr, 0x06);
220 #ifdef SMBIOS_SERIAL_NUMBERS
221 smbios_setenv("smbios.chassis.serial", addr, 0x07);
222 smbios_setenv("smbios.chassis.tag", addr, 0x08);
226 case 4: /* 3.3.5 Processor Information (Type 4) */
228 * Offset 18h: Processor Status
230 * Bit 7 Reserved, must be 0
231 * Bit 6 CPU Socket Populated
232 * 1 - CPU Socket Populated
233 * 0 - CPU Socket Unpopulated
234 * Bit 5:3 Reserved, must be zero
238 * 2h - CPU Disabled by User via BIOS Setup
239 * 3h - CPU Disabled by BIOS (POST Error)
240 * 4h - CPU is Idle, waiting to be enabled
244 proc = SMBIOS_GET8(addr, 0x18);
245 if ((proc & 0x07) == 1)
246 smbios_enabled_sockets++;
247 if ((proc & 0x40) != 0)
248 smbios_populated_sockets++;
251 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */
253 * Offset 0Ah: Enabled Size
255 * Bit 7 Bank connection
256 * 1 - Double-bank connection
257 * 0 - Single-bank connection
258 * Bit 6:0 Size (n), where 2**n is the size in MB
259 * 7Dh - Not determinable (Installed Size only)
260 * 7Eh - Module is installed, but no memory
262 * 7Fh - Not installed
264 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f;
265 if (osize > 0 && osize < 22)
266 smbios_old_enabled_memory += 1 << (osize + 10);
269 case 17: /* 3.3.18 Memory Device (Type 17) */
274 * 1 - Value is in kilobytes units
275 * 0 - Value is in megabytes units
278 size = SMBIOS_GET16(addr, 0x0c);
279 if (size != 0 && size != 0xffff)
280 smbios_enabled_memory += (size & 0x8000) != 0 ?
281 (size & 0x7fff) : (size << 10);
284 default: /* skip other types */
288 /* Find structure terminator. */
289 cp = SMBIOS_GETSTR(addr);
290 while (SMBIOS_GET16(cp, 0) != 0)
300 caddr_t addr, dmi, smbios;
301 size_t count, length;
303 int i, major, minor, ver;
305 /* Search signatures and validate checksums. */
306 smbios = smbios_sigsearch(PTOV(SMBIOS_START), SMBIOS_LENGTH);
310 length = SMBIOS_GET16(smbios, 0x16); /* Structure Table Length */
311 paddr = SMBIOS_GET32(smbios, 0x18); /* Structure Table Address */
312 count = SMBIOS_GET16(smbios, 0x1c); /* No of SMBIOS Structures */
313 ver = SMBIOS_GET8(smbios, 0x1e); /* SMBIOS BCD Revision */
318 if (major > 9 || minor > 9)
322 major = SMBIOS_GET8(smbios, 0x06); /* SMBIOS Major Version */
323 minor = SMBIOS_GET8(smbios, 0x07); /* SMBIOS Minor Version */
325 ver = (major << 8) | minor;
328 for (dmi = addr, i = 0; dmi < addr + length && i < count; i++)
329 dmi = smbios_parse_table(dmi, ver);
331 sprintf(buf, "%d.%d", major, minor);
332 setenv("smbios.version", buf, 1);
333 if (smbios_enabled_memory > 0 || smbios_old_enabled_memory > 0) {
334 sprintf(buf, "%u", smbios_enabled_memory > 0 ?
335 smbios_enabled_memory : smbios_old_enabled_memory);
336 setenv("smbios.memory.enabled", buf, 1);
338 if (smbios_enabled_sockets > 0) {
339 sprintf(buf, "%u", smbios_enabled_sockets);
340 setenv("smbios.socket.enabled", buf, 1);
342 if (smbios_populated_sockets > 0) {
343 sprintf(buf, "%u", smbios_populated_sockets);
344 setenv("smbios.socket.populated", buf, 1);