1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1997 Michael Smith
5 * Copyright (c) 1998 Jonathan Lemon
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _SMBIOS_H_
31 #define _SMBIOS_H_
32
33 /*
34 * System Management BIOS
35 */
36 #define SMBIOS_START 0xf0000
37 #define SMBIOS_STEP 0x10
38 #define SMBIOS_OFF 0
39 #define SMBIOS_LEN 4
40 #define SMBIOS_SIG "_SM_"
41
42 struct smbios_eps {
43 uint8_t anchor_string[4]; /* '_SM_' */
44 uint8_t checksum;
45 uint8_t length;
46 uint8_t major_version;
47 uint8_t minor_version;
48 uint16_t maximum_structure_size;
49 uint8_t entry_point_revision;
50 uint8_t formatted_area[5];
51 uint8_t intermediate_anchor_string[5]; /* '_DMI_' */
52 uint8_t intermediate_checksum;
53 uint16_t structure_table_length;
54 uint32_t structure_table_address;
55 uint16_t number_structures;
56 uint8_t BCD_revision;
57 } __packed;
58
59 struct smbios_structure_header {
60 uint8_t type;
61 uint8_t length;
62 uint16_t handle;
63 } __packed;
64
65 typedef void (*smbios_callback_t)(struct smbios_structure_header *, void *);
66
67 static inline void
smbios_walk_table(uint8_t * p,int entries,smbios_callback_t cb,void * arg)68 smbios_walk_table(uint8_t *p, int entries, smbios_callback_t cb, void *arg)
69 {
70 struct smbios_structure_header *s;
71
72 while (entries--) {
73 s = (struct smbios_structure_header *)p;
74 cb(s, arg);
75
76 /*
77 * Look for a double-nul after the end of the
78 * formatted area of this structure.
79 */
80 p += s->length;
81 while (!(p[0] == 0 && p[1] == 0))
82 p++;
83
84 /*
85 * Skip over the double-nul to the start of the next
86 * structure.
87 */
88 p += 2;
89 }
90 }
91
92 #ifdef _KERNEL
93 void identify_hypervisor_smbios(void);
94 #endif
95
96 #endif /* _SMBIOS_H_ */
97