1 /*- 2 * Copyright (c) 2020 The FreeBSD Foundation 3 * 4 * This software was developed by Emmanuel Vadot under sponsorship 5 * from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 33 #include <linux/dmi.h> 34 35 static char *dmi_data[DMI_STRING_MAX]; 36 37 static void 38 linux_dmi_preload(void *arg) 39 { 40 41 dmi_data[DMI_BIOS_VENDOR] = kern_getenv("smbios.bios.vendor"); 42 dmi_data[DMI_BIOS_VERSION] = kern_getenv("smbios.bios.version"); 43 dmi_data[DMI_BIOS_DATE] = kern_getenv("smbios.bios.reldate"); 44 dmi_data[DMI_SYS_VENDOR] = kern_getenv("smbios.system.maker"); 45 dmi_data[DMI_PRODUCT_NAME] = kern_getenv("smbios.system.product"); 46 dmi_data[DMI_PRODUCT_VERSION] = kern_getenv("smbios.system.version"); 47 dmi_data[DMI_PRODUCT_SERIAL] = kern_getenv("smbios.system.serial"); 48 dmi_data[DMI_PRODUCT_UUID] = kern_getenv("smbios.system.uuid"); 49 dmi_data[DMI_BOARD_VENDOR] = kern_getenv("smbios.planar.maker"); 50 dmi_data[DMI_BOARD_NAME] = kern_getenv("smbios.planar.product"); 51 dmi_data[DMI_BOARD_VERSION] = kern_getenv("smbios.planar.version"); 52 dmi_data[DMI_BOARD_SERIAL] = kern_getenv("smbios.planar.serial"); 53 dmi_data[DMI_BOARD_ASSET_TAG] = kern_getenv("smbios.planar.tag"); 54 dmi_data[DMI_CHASSIS_VENDOR] = kern_getenv("smbios.chassis.maker"); 55 dmi_data[DMI_CHASSIS_TYPE] = kern_getenv("smbios.chassis.type"); 56 dmi_data[DMI_CHASSIS_VERSION] = kern_getenv("smbios.chassis.version"); 57 dmi_data[DMI_CHASSIS_SERIAL] = kern_getenv("smbios.chassis.serial"); 58 dmi_data[DMI_CHASSIS_ASSET_TAG] = kern_getenv("smbios.chassis.tag"); 59 } 60 SYSINIT(linux_dmi_preload, SI_SUB_DRIVERS, SI_ORDER_ANY, linux_dmi_preload, NULL); 61 62 /* Match a system against a field */ 63 bool 64 linux_dmi_match(enum dmi_field f, const char *str) 65 { 66 67 if (f < DMI_STRING_MAX && 68 dmi_data[f] != NULL && 69 strcmp(dmi_data[f], str) == 0) 70 return(true); 71 return (false); 72 } 73 74 /* Match a system against the struct, all matches must be ok */ 75 static bool 76 linux_dmi_matches(const struct dmi_system_id *dsi) 77 { 78 enum dmi_field slot; 79 int i; 80 81 for (i = 0; i < nitems(dsi->matches); i++) { 82 slot = dsi->matches[i].slot; 83 if (slot == DMI_NONE) 84 break; 85 if (slot >= DMI_STRING_MAX || 86 dmi_data[slot] == NULL) 87 return (false); 88 if (dsi->matches[i].exact_match) { 89 if (dmi_match(slot, dsi->matches[i].substr)) 90 continue; 91 } else if (strstr(dmi_data[slot], 92 dsi->matches[i].substr) != NULL) { 93 continue; 94 } 95 return (false); 96 } 97 return (true); 98 } 99 100 /* Return the string matching the field */ 101 const char * 102 linux_dmi_get_system_info(int field) 103 { 104 105 if (field < DMI_STRING_MAX) 106 return (dmi_data[field]); 107 return (NULL); 108 } 109 110 /* 111 * Match a system against the structs list 112 * If a match is found return the corresponding structure. 113 */ 114 const struct dmi_system_id * 115 linux_dmi_first_match(const struct dmi_system_id *list) 116 { 117 const struct dmi_system_id *dsi; 118 119 for (dsi = list; dsi->matches[0].slot != 0; dsi++) { 120 if (linux_dmi_matches(dsi)) 121 return (dsi); 122 } 123 124 return (NULL); 125 } 126 127 /* 128 * Match a system against the structs list 129 * For each match call the callback with the corresponding data 130 * Return the number of matches. 131 */ 132 int 133 linux_dmi_check_system(const struct dmi_system_id *sysid) 134 { 135 const struct dmi_system_id *dsi; 136 int matches = 0; 137 138 for (dsi = sysid; dsi->matches[0].slot != 0; dsi++) { 139 if (linux_dmi_matches(dsi)) { 140 matches++; 141 if (dsi->callback && dsi->callback(dsi)) 142 break; 143 } 144 } 145 146 return (matches); 147 } 148