1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 * $FreeBSD$ 30 */ 31 32 #ifndef _SMBIOS_H_ 33 #define _SMBIOS_H_ 34 35 /* 36 * System Management BIOS 37 */ 38 #define SMBIOS_START 0xf0000 39 #define SMBIOS_STEP 0x10 40 #define SMBIOS_OFF 0 41 #define SMBIOS_LEN 4 42 #define SMBIOS_SIG "_SM_" 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 smbios_structure_header { 62 uint8_t type; 63 uint8_t length; 64 uint16_t handle; 65 } __packed; 66 67 typedef void (*smbios_callback_t)(struct smbios_structure_header *, void *); 68 69 static inline void 70 smbios_walk_table(uint8_t *p, int entries, smbios_callback_t cb, void *arg) 71 { 72 struct smbios_structure_header *s; 73 74 while (entries--) { 75 s = (struct smbios_structure_header *)p; 76 cb(s, arg); 77 78 /* 79 * Look for a double-nul after the end of the 80 * formatted area of this structure. 81 */ 82 p += s->length; 83 while (!(p[0] == 0 && p[1] == 0)) 84 p++; 85 86 /* 87 * Skip over the double-nul to the start of the next 88 * structure. 89 */ 90 p += 2; 91 } 92 } 93 94 #endif /* _SMBIOS_H_ */ 95