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
smbios_checksum(const caddr_t addr,const uint8_t len)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
smbios_sigsearch(const caddr_t addr,const uint32_t len)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
smbios_setenv(const char * name,caddr_t addr,const int offset)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
smbios_setuuid(const char * name,const caddr_t addr,const int ver)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
smbios_parse_table(const caddr_t addr,const int ver)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
smbios_detect(const caddr_t addr)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