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 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