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
28 #include <sys/endian.h>
30 #define PTOV(x) ptov(x)
32 /* Only enable 64-bit entry point if it makes sense */
33 #if __SIZEOF_POINTER__ > 4
38 * Detect SMBIOS and export information about the SMBIOS into the
41 * System Management BIOS Reference Specification, v2.6 Final
42 * http://www.dmtf.org/standards/published_documents/DSP0134_2.6.0.pdf
44 * System Management BIOS (SMBIOS) Reference Specification, 3.6.0
45 * https://www.dmtf.org/sites/default/files/standards/documents/DSP0134_3.6.0.pdf
49 * The first quoted paragraph below can also be found in section 2.1.1 SMBIOS
50 * Structure Table Entry Point of System Management BIOS Reference
51 * Specification, v2.6 Final
53 * (From System Management BIOS (SMBIOS) Reference Specification, 3.6.0)
54 * 5.2.1 SMBIOS 2.1 (32-bit) Entry Point
56 * "On non-UEFI systems, the 32-bit SMBIOS Entry Point structure, can be
57 * located by application software by searching for the anchor-string on
58 * paragraph (16-byte) boundaries within the physical memory address
59 * range 000F0000h to 000FFFFFh. This entry point encapsulates an intermediate
60 * anchor string that is used by some existing DMI browsers.
62 * On UEFI-based systems, the SMBIOS Entry Point structure can be located by
63 * looking in the EFI Configuration Table for the SMBIOS GUID
64 * (SMBIOS_TABLE_GUID, {EB9D2D31-2D88-11D3-9A16-0090273FC14D}) and using the
65 * associated pointer. See section 4.6 of the UEFI Specification for details.
66 * See section 2.3 of the UEFI Specification for how to report the containing
69 * NOTE While the SMBIOS Major and Minor Versions (offsets 06h and 07h)
70 * currently duplicate the information that is present in the SMBIOS BCD
71 * Revision (offset 1Eh), they provide a path for future growth in this
72 * specification. The BCD Revision, for example, provides only a single digit
73 * for each of the major and minor version numbers."
75 * 5.2.2 SMBIOS 860 3.0 (64-bit) Entry Point
77 * "On non-UEFI systems, the 64-bit SMBIOS Entry Point structure can be located
78 * by application software by searching for the anchor-string on paragraph
79 * (16-byte) boundaries within the physical memory address range 000F0000h to
82 * On UEFI-based systems, the SMBIOS Entry Point structure can be located by
83 * looking in the EFI Configuration Table for the SMBIOS 3.x GUID
84 * (SMBIOS3_TABLE_GUID, {F2FD1544-9794-4A2C-992E-E5BBCF20E394}) and using the
85 * associated pointer. See section 4.6 of the UEFI Specification for details.
86 * See section 2.3 of the UEFI Specification for how to report the containing
89 #define SMBIOS_START 0xf0000
90 #define SMBIOS_LENGTH 0x10000
91 #define SMBIOS_STEP 0x10
92 #define SMBIOS_SIG "_SM_"
93 #define SMBIOS3_SIG "_SM3_"
94 #define SMBIOS_DMI_SIG "_DMI_"
99 * NOTE The Entry Point Structure and all SMBIOS structures assume a
100 * little-endian ordering convention...
103 * We use memcpy to avoid unaligned access to memory. To normal memory, this is
104 * fine, but the memory we are using might be mmap'd /dev/mem which under Linux
105 * on aarch64 doesn't allow unaligned access. leXdec and friends can't be used
106 * because those can optimize to an unaligned load (which often is fine, but not
107 * for mmap'd /dev/mem which has special memory attributes).
109 static inline uint8_t SMBIOS_GET8(const caddr_t base, int off) { return (base[off]); }
111 static inline uint16_t
112 SMBIOS_GET16(const caddr_t base, int off)
116 memcpy(&v, base + off, sizeof(v));
120 static inline uint32_t
121 SMBIOS_GET32(const caddr_t base, int off)
125 memcpy(&v, base + off, sizeof(v));
129 static inline uint64_t
130 SMBIOS_GET64(const caddr_t base, int off)
134 memcpy(&v, base + off, sizeof(v));
138 #define SMBIOS_GETLEN(base) SMBIOS_GET8(base, 0x01)
139 #define SMBIOS_GETSTR(base) ((base) + SMBIOS_GETLEN(base))
149 const char* bios_vendor;
152 uint32_t enabled_memory;
153 uint32_t old_enabled_memory;
154 uint8_t enabled_sockets;
155 uint8_t populated_sockets;
158 static struct smbios_attr smbios;
164 smbios_checksum(const caddr_t addr, const uint8_t len)
169 for (sum = 0, i = 0; i < len; i++)
170 sum += SMBIOS_GET8(addr, i);
175 smbios_sigsearch(const caddr_t addr, const uint32_t len)
179 /* Search on 16-byte boundaries. */
180 for (cp = addr; cp < addr + len; cp += SMBIOS_STEP) {
181 /* v2.1, 32-bit Entry point */
182 if (strncmp(cp, SMBIOS_SIG, sizeof(SMBIOS_SIG) - 1) == 0 &&
183 smbios_checksum(cp, SMBIOS_GET8(cp, 0x05)) == 0 &&
184 strncmp(cp + 0x10, SMBIOS_DMI_SIG, 5) == 0 &&
185 smbios_checksum(cp + 0x10, 0x0f) == 0)
189 /* v3.0, 64-bit Entry point */
190 if (strncmp(cp, SMBIOS3_SIG, sizeof(SMBIOS3_SIG) - 1) == 0 &&
191 smbios_checksum(cp, SMBIOS_GET8(cp, 0x06)) == 0) {
201 smbios_getstring(caddr_t addr, const int offset)
206 idx = SMBIOS_GET8(addr, offset);
208 cp = SMBIOS_GETSTR(addr);
209 for (i = 1; i < idx; i++)
210 cp += strlen(cp) + 1;
217 smbios_setenv(const char *name, caddr_t addr, const int offset)
221 val = smbios_getstring(addr, offset);
223 setenv(name, val, 1);
226 #ifdef SMBIOS_SERIAL_NUMBERS
229 #define UUID_TYPE uint32_t
230 #define UUID_STEP sizeof(UUID_TYPE)
231 #define UUID_ALL_BITS (UUID_SIZE / UUID_STEP)
232 #define UUID_GET(base, off) SMBIOS_GET32(base, off)
235 smbios_setuuid(const char *name, const caddr_t addr, const int ver __unused)
238 int byteorder, i, ones, zeros;
243 for (i = 0, ones = 0, zeros = 0; i < UUID_SIZE; i += UUID_STEP) {
244 n = UUID_GET(addr, i) + 1;
245 if (zeros == 0 && n == 0)
247 else if (ones == 0 && n == 1)
253 if (ones != UUID_ALL_BITS && zeros != UUID_ALL_BITS) {
255 * 3.3.2.1 System UUID
257 * "Although RFC 4122 recommends network byte order for all
258 * fields, the PC industry (including the ACPI, UEFI, and
259 * Microsoft specifications) has consistently used
260 * little-endian byte encoding for the first three fields:
261 * time_low, time_mid, time_hi_and_version. The same encoding,
262 * also known as wire format, should also be used for the
263 * SMBIOS representation of the UUID."
265 * Note: We use network byte order for backward compatibility
266 * unless SMBIOS version is 2.6+ or little-endian is forced.
268 #if defined(SMBIOS_LITTLE_ENDIAN_UUID)
269 byteorder = LITTLE_ENDIAN;
270 #elif defined(SMBIOS_NETWORK_ENDIAN_UUID)
271 byteorder = BIG_ENDIAN;
273 byteorder = ver < 0x0206 ? BIG_ENDIAN : LITTLE_ENDIAN;
275 if (byteorder != LITTLE_ENDIAN) {
276 f1 = ntohl(SMBIOS_GET32(addr, 0));
277 f2 = ntohs(SMBIOS_GET16(addr, 4));
278 f3 = ntohs(SMBIOS_GET16(addr, 6));
280 f1 = le32toh(SMBIOS_GET32(addr, 0));
281 f2 = le16toh(SMBIOS_GET16(addr, 4));
282 f3 = le16toh(SMBIOS_GET16(addr, 6));
285 "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
286 f1, f2, f3, SMBIOS_GET8(addr, 8), SMBIOS_GET8(addr, 9),
287 SMBIOS_GET8(addr, 10), SMBIOS_GET8(addr, 11),
288 SMBIOS_GET8(addr, 12), SMBIOS_GET8(addr, 13),
289 SMBIOS_GET8(addr, 14), SMBIOS_GET8(addr, 15));
290 setenv(name, uuid, 1);
303 smbios_parse_chassis_type(caddr_t addr)
307 type = SMBIOS_GET8(addr, 0x5);
316 return ("Low Profile Desktop");
318 return ("Pizza Box");
320 return ("Mini Tower");
330 return ("Hand Held");
332 return ("Docking Station");
334 return ("All in One");
336 return ("Sub Notebook");
338 return ("Lunch Box");
340 return ("Space-saving");
342 return ("Main Server Chassis");
344 return ("Expansion Chassis");
346 return ("SubChassis");
348 return ("Bus Expansion Chassis");
350 return ("Peripheral Chassis");
352 return ("RAID Chassis");
354 return ("Rack Mount Chassis");
356 return ("Sealed-case PC");
358 return ("Multi-system chassis");
360 return ("Compact PCI");
362 return ("Advanced TCA");
366 return ("Blade Enclosure");
370 return ("Convertible");
372 return ("Detachable");
374 return ("IoT Gateway");
376 return ("Embedded PC");
383 return ("Undefined");
387 smbios_parse_table(const caddr_t addr)
390 int proc, size, osize, type;
391 uint8_t bios_minor, bios_major;
394 type = SMBIOS_GET8(addr, 0); /* 3.1.2 Structure Header Format */
396 case 0: /* 3.3.1 BIOS Information (Type 0) */
397 smbios_setenv("smbios.bios.vendor", addr, 0x04);
398 smbios_setenv("smbios.bios.version", addr, 0x05);
399 smbios_setenv("smbios.bios.reldate", addr, 0x08);
400 bios_major = SMBIOS_GET8(addr, 0x14);
401 bios_minor = SMBIOS_GET8(addr, 0x15);
402 if (bios_minor != 0xFF && bios_major != 0xFF) {
403 snprintf(buf, sizeof(buf), "%u.%u",
404 bios_major, bios_minor);
405 setenv("smbios.bios.revision", buf, 1);
409 case 1: /* 3.3.2 System Information (Type 1) */
410 smbios_setenv("smbios.system.maker", addr, 0x04);
411 smbios_setenv("smbios.system.product", addr, 0x05);
412 smbios_setenv("smbios.system.version", addr, 0x06);
413 #ifdef SMBIOS_SERIAL_NUMBERS
414 smbios_setenv("smbios.system.serial", addr, 0x07);
415 smbios_setuuid("smbios.system.uuid", addr + 0x08, smbios.ver);
417 if (smbios.major > 2 ||
418 (smbios.major == 2 && smbios.minor >= 4)) {
419 smbios_setenv("smbios.system.sku", addr, 0x19);
420 smbios_setenv("smbios.system.family", addr, 0x1a);
424 case 2: /* 3.3.3 Base Board (or Module) Information (Type 2) */
425 smbios_setenv("smbios.planar.maker", addr, 0x04);
426 smbios_setenv("smbios.planar.product", addr, 0x05);
427 smbios_setenv("smbios.planar.version", addr, 0x06);
428 #ifdef SMBIOS_SERIAL_NUMBERS
429 smbios_setenv("smbios.planar.serial", addr, 0x07);
430 smbios_setenv("smbios.planar.tag", addr, 0x08);
432 smbios_setenv("smbios.planar.location", addr, 0x0a);
435 case 3: /* 3.3.4 System Enclosure or Chassis (Type 3) */
436 smbios_setenv("smbios.chassis.maker", addr, 0x04);
437 setenv("smbios.chassis.type", smbios_parse_chassis_type(addr), 1);
438 smbios_setenv("smbios.chassis.version", addr, 0x06);
439 #ifdef SMBIOS_SERIAL_NUMBERS
440 smbios_setenv("smbios.chassis.serial", addr, 0x07);
441 smbios_setenv("smbios.chassis.tag", addr, 0x08);
445 case 4: /* 3.3.5 Processor Information (Type 4) */
447 * Offset 18h: Processor Status
449 * Bit 7 Reserved, must be 0
450 * Bit 6 CPU Socket Populated
451 * 1 - CPU Socket Populated
452 * 0 - CPU Socket Unpopulated
453 * Bit 5:3 Reserved, must be zero
457 * 2h - CPU Disabled by User via BIOS Setup
458 * 3h - CPU Disabled by BIOS (POST Error)
459 * 4h - CPU is Idle, waiting to be enabled
463 proc = SMBIOS_GET8(addr, 0x18);
464 if ((proc & 0x07) == 1)
465 smbios.enabled_sockets++;
466 if ((proc & 0x40) != 0)
467 smbios.populated_sockets++;
470 case 6: /* 3.3.7 Memory Module Information (Type 6, Obsolete) */
472 * Offset 0Ah: Enabled Size
474 * Bit 7 Bank connection
475 * 1 - Double-bank connection
476 * 0 - Single-bank connection
477 * Bit 6:0 Size (n), where 2**n is the size in MB
478 * 7Dh - Not determinable (Installed Size only)
479 * 7Eh - Module is installed, but no memory
481 * 7Fh - Not installed
483 osize = SMBIOS_GET8(addr, 0x0a) & 0x7f;
484 if (osize > 0 && osize < 22)
485 smbios.old_enabled_memory += 1 << (osize + 10);
488 case 17: /* 3.3.18 Memory Device (Type 17) */
493 * 1 - Value is in kilobytes units
494 * 0 - Value is in megabytes units
497 size = SMBIOS_GET16(addr, 0x0c);
498 if (size != 0 && size != 0xffff)
499 smbios.enabled_memory += (size & 0x8000) != 0 ?
500 (size & 0x7fff) : (size << 10);
503 default: /* skip other types */
507 /* Find structure terminator. */
508 cp = SMBIOS_GETSTR(addr);
509 while (SMBIOS_GET16(cp, 0) != 0)
516 smbios_find_struct(int type)
522 if (smbios.addr == NULL)
525 ep = smbios.addr + smbios.length;
526 for (dmi = smbios.addr, i = 0;
527 dmi < ep && i < smbios.count; i++) {
528 if (SMBIOS_GET8(dmi, 0) == type) {
531 /* Find structure terminator. */
532 dmi = SMBIOS_GETSTR(dmi);
533 while (SMBIOS_GET16(dmi, 0) != 0 && dmi < ep) {
536 dmi += 2; /* For checksum */
543 smbios_probe(const caddr_t addr)
554 /* Search signatures and validate checksums. */
555 saddr = smbios_sigsearch(addr ? addr : PTOV(SMBIOS_START),
562 smbios.length = SMBIOS_GET32(saddr, 0x0c); /* Structure Table Length */
563 paddr = SMBIOS_GET64(saddr, 0x10); /* Structure Table Address */
564 smbios.count = -1; /* not present in V3 */
565 smbios.ver = 0; /* not present in V3 */
571 smbios.length = SMBIOS_GET16(saddr, 0x16); /* Structure Table Length */
572 paddr = SMBIOS_GET32(saddr, 0x18); /* Structure Table Address */
573 smbios.count = SMBIOS_GET16(saddr, 0x1c); /* No of SMBIOS Structures */
574 smbios.ver = SMBIOS_GET8(saddr, 0x1e); /* SMBIOS BCD Revision */
580 if (smbios.ver != 0) {
581 smbios.major = smbios.ver >> 4;
582 smbios.minor = smbios.ver & 0x0f;
583 if (smbios.major > 9 || smbios.minor > 9)
586 if (smbios.ver == 0) {
587 smbios.major = SMBIOS_GET8(saddr, maj_off);/* SMBIOS Major Version */
588 smbios.minor = SMBIOS_GET8(saddr, min_off);/* SMBIOS Minor Version */
590 smbios.ver = (smbios.major << 8) | smbios.minor;
591 smbios.addr = PTOV(paddr);
593 /* Get system information from SMBIOS */
594 info = smbios_find_struct(0x00);
596 smbios.bios_vendor = smbios_getstring(info, 0x04);
598 info = smbios_find_struct(0x01);
600 smbios.maker = smbios_getstring(info, 0x04);
601 smbios.product = smbios_getstring(info, 0x05);
606 smbios_detect(const caddr_t addr)
613 if (smbios.addr == NULL)
616 for (dmi = smbios.addr, i = 0;
617 dmi < smbios.addr + smbios.length && i < smbios.count; i++)
618 dmi = smbios_parse_table(dmi);
620 sprintf(buf, "%d.%d", smbios.major, smbios.minor);
621 setenv("smbios.version", buf, 1);
622 if (smbios.enabled_memory > 0 || smbios.old_enabled_memory > 0) {
623 sprintf(buf, "%u", smbios.enabled_memory > 0 ?
624 smbios.enabled_memory : smbios.old_enabled_memory);
625 setenv("smbios.memory.enabled", buf, 1);
627 if (smbios.enabled_sockets > 0) {
628 sprintf(buf, "%u", smbios.enabled_sockets);
629 setenv("smbios.socket.enabled", buf, 1);
631 if (smbios.populated_sockets > 0) {
632 sprintf(buf, "%u", smbios.populated_sockets);
633 setenv("smbios.socket.populated", buf, 1);
638 smbios_match_str(const char* s1, const char* s2)
640 return (s1 == NULL || (s2 != NULL && !strcmp(s1, s2)));
644 smbios_match(const char* bios_vendor, const char* maker,
647 /* XXXRP currently, only called from non-EFI. */
649 return (smbios_match_str(bios_vendor, smbios.bios_vendor) &&
650 smbios_match_str(maker, smbios.maker) &&
651 smbios_match_str(product, smbios.product));