1 /* $NetBSD: smbios.c,v 1.4 2021/09/16 22:19:11 andvar Exp $ */ 2 3 /* 4 * Copyright (c) 1999 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1999, by UCHIYAMA Yasushi 35 * All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. The name of the developer may NOT be used to endorse or promote products 43 * derived from this software without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 */ 57 58 /* 59 * Copyright (c) 1997-2001 Michael Shalayeff 60 * All rights reserved. 61 * 62 * Redistribution and use in source and binary forms, with or without 63 * modification, are permitted provided that the following conditions 64 * are met: 65 * 1. Redistributions of source code must retain the above copyright 66 * notice, this list of conditions and the following disclaimer. 67 * 2. Redistributions in binary form must reproduce the above copyright 68 * notice, this list of conditions and the following disclaimer in the 69 * documentation and/or other materials provided with the distribution. 70 * 71 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 72 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 73 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 74 * IN NO EVENT SHALL THE AUTHOR OR HIS RELATIVES BE LIABLE FOR ANY DIRECT, 75 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 76 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 77 * SERVICES; LOSS OF MIND, USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 78 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 79 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 80 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 81 * THE POSSIBILITY OF SUCH DAMAGE. 82 */ 83 84 #include <sys/cdefs.h> 85 __KERNEL_RCSID(0, "$NetBSD: smbios.c,v 1.4 2021/09/16 22:19:11 andvar Exp $"); 86 87 #include <sys/param.h> 88 89 #include "efiboot.h" 90 #include "smbios.h" 91 92 struct smbios_entry smbios_entry; 93 94 static void 95 smbios2_init(uint8_t *p) 96 { 97 const struct smbhdr *sh = (const struct smbhdr *)p; 98 99 smbios_entry.addr = (void *)(uintptr_t)sh->addr; 100 smbios_entry.len = sh->size; 101 smbios_entry.rev = 0; 102 smbios_entry.mjr = sh->majrev; 103 smbios_entry.min = sh->minrev; 104 smbios_entry.doc = 0; 105 smbios_entry.count = sh->count; 106 } 107 108 static void 109 smbios3_init(uint8_t *p) 110 { 111 const struct smb3hdr *sh = (const struct smb3hdr *)p; 112 113 smbios_entry.addr = (void *)(uintptr_t)sh->addr; 114 smbios_entry.len = sh->size; 115 smbios_entry.rev = sh->eprev; 116 smbios_entry.mjr = sh->majrev; 117 smbios_entry.min = sh->minrev; 118 smbios_entry.doc = sh->docrev; 119 smbios_entry.count = UINT16_MAX; 120 } 121 122 void 123 smbios_init(uint8_t *p) 124 { 125 if (memcmp(p, "_SM3_", 5) == 0) { 126 smbios3_init(p); 127 } else if (memcmp(p, "_SM_", 4) == 0) { 128 smbios2_init(p); 129 } 130 } 131 132 /* 133 * smbios_find_table() takes a caller supplied smbios struct type and 134 * a pointer to a handle (struct smbtable) returning one if the structure 135 * is successfully located and zero otherwise. Callers should take care 136 * to initilize the cookie field of the smbtable structure to zero before 137 * the first invocation of this function. 138 * Multiple tables of the same type can be located by repeadtly calling 139 * smbios_find_table with the same arguments. 140 */ 141 int 142 smbios_find_table(uint8_t type, struct smbtable *st) 143 { 144 uint8_t *va, *end; 145 struct smbtblhdr *hdr; 146 int ret = 0, tcount = 1; 147 148 if (smbios_entry.addr == 0) { 149 return 0; 150 } 151 152 va = smbios_entry.addr; 153 end = va + smbios_entry.len; 154 155 /* 156 * The cookie field of the smtable structure is used to locate 157 * multiple instances of a table of an arbitrary type. Following the 158 * successful location of a table, the type is encoded as bits 0:7 of 159 * the cookie value, the offset in terms of the number of structures 160 * preceding that referenced by the handle is encoded in bits 15:31. 161 */ 162 if ((st->cookie & 0xfff) == type && st->cookie >> 16) { 163 if ((uint8_t *)st->hdr >= va && (uint8_t *)st->hdr < end) { 164 hdr = st->hdr; 165 if (hdr->type == type) { 166 va = (uint8_t *)hdr + hdr->size; 167 for (; va + 1 < end; va++) 168 if (*va == 0 && *(va + 1) == 0) 169 break; 170 va+= 2; 171 tcount = st->cookie >> 16; 172 } 173 } 174 } 175 for (; va + sizeof(struct smbtblhdr) < end && tcount <= 176 smbios_entry.count; tcount++) { 177 hdr = (struct smbtblhdr *)va; 178 if (hdr->type == type) { 179 ret = 1; 180 st->hdr = hdr; 181 st->tblhdr = va + sizeof(struct smbtblhdr); 182 st->cookie = (tcount + 1) << 16 | type; 183 break; 184 } 185 if (hdr->type == SMBIOS_TYPE_EOT) 186 break; 187 va+= hdr->size; 188 for (; va + 1 < end; va++) 189 if (*va == 0 && *(va + 1) == 0) 190 break; 191 va+=2; 192 } 193 194 return ret; 195 } 196 197 char * 198 smbios_get_string(struct smbtable *st, uint8_t indx, char *dest, size_t len) 199 { 200 uint8_t *va, *end; 201 char *ret = NULL; 202 int i; 203 204 if (smbios_entry.addr == 0) { 205 return NULL; 206 } 207 208 va = (uint8_t *)st->hdr + st->hdr->size; 209 end = smbios_entry.addr + smbios_entry.len; 210 for (i = 1; va < end && i < indx && *va; i++) 211 while (*va++) 212 ; 213 if (i == indx) { 214 if (va + len < end) { 215 ret = dest; 216 memcpy(ret, va, len); 217 ret[len - 1] = '\0'; 218 } 219 } 220 221 return ret; 222 } 223
Indexes created Sat Sep 20 22:09:52 GMT 2025