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 #define SMBIOS3_LEN 5
42 #define SMBIOS3_SIG "_SM3_"
43
44 struct smbios_eps {
45 uint8_t anchor_string[4]; /* '_SM_' */
46 uint8_t checksum;
47 uint8_t length;
48 uint8_t major_version;
49 uint8_t minor_version;
50 uint16_t maximum_structure_size;
51 uint8_t entry_point_revision;
52 uint8_t formatted_area[5];
53 uint8_t intermediate_anchor_string[5]; /* '_DMI_' */
54 uint8_t intermediate_checksum;
55 uint16_t structure_table_length;
56 uint32_t structure_table_address;
57 uint16_t number_structures;
58 uint8_t BCD_revision;
59 } __packed;
60
61 struct smbios3_eps {
62 uint8_t anchor_string[5]; /* '_SM3_' */
63 uint8_t checksum;
64 uint8_t length;
65 uint8_t major_version;
66 uint8_t minor_version;
67 uint8_t docrev;
68 uint8_t entry_point_revision;
69 uint8_t reserved;
70 uint32_t structure_table_max_size;
71 uint64_t structure_table_address;
72 };
73
74 struct smbios_structure_header {
75 uint8_t type;
76 uint8_t length;
77 uint16_t handle;
78 } __packed;
79
80 typedef void (*smbios_callback_t)(struct smbios_structure_header *, void *);
81
82 static inline void
smbios_walk_table(uint8_t * p,int entries,vm_size_t len,smbios_callback_t cb,void * arg)83 smbios_walk_table(uint8_t *p, int entries, vm_size_t len,
84 smbios_callback_t cb, void *arg)
85 {
86 struct smbios_structure_header *s;
87 uint8_t *endp = p + len;
88
89 while (entries-- && p < endp) {
90 s = (struct smbios_structure_header *)p;
91 cb(s, arg);
92
93 /*
94 * Look for a double-nul after the end of the
95 * formatted area of this structure.
96 */
97 p += s->length;
98 while (p + 1 < endp && !(p[0] == 0 && p[1] == 0))
99 p++;
100
101 /*
102 * Skip over the double-nul to the start of the next
103 * structure.
104 */
105 p += 2;
106 }
107 }
108
109 #ifdef _KERNEL
110 void identify_hypervisor_smbios(void);
111 #endif
112
113 #endif /* _SMBIOS_H_ */
114