Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/bios/smbios.c
Version:
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1 /*- 2 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/5.1/sys/i386/bios/smbios.c 112553 2003-03-24 19:32:57Z mdodd $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/kernel.h> 32 #include <sys/socket.h> 33 34 #include <sys/module.h> 35 #include <sys/bus.h> 36 37 #include <machine/bus.h> 38 #include <machine/resource.h> 39 #include <sys/rman.h> 40 41 #include <vm/vm.h> 42 #include <vm/pmap.h> 43 #include <machine/md_var.h> 44 #include <machine/pc/bios.h> 45 46 /* 47 * SMBIOS Entry Point Structure 48 */ 49 struct smbios_eps { 50 u_int8_t Anchor[4]; /* '_SM_' */ 51 u_int8_t Checksum; 52 u_int8_t Length; 53 54 u_int8_t SMBIOS_Major; 55 u_int8_t SMBIOS_Minor; 56 u_int8_t Max_Size; 57 u_int8_t Revision; 58 u_int8_t Formatted_Area; 59 60 u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */ 61 u_int8_t Intermediate_Checksum; 62 63 u_int16_t Structure_Table_Length; 64 u_int32_t Structure_Table_Address; 65 u_int16_t Structure_Count; 66 67 u_int8_t SMBIOS_BCD_Revision; 68 } __packed; 69 70 struct smbios_softc { 71 device_t dev; 72 struct resource * res; 73 int rid; 74 75 struct smbios_eps * eps; 76 }; 77 78 #define SMBIOS_START 0xf0000 79 #define SMBIOS_STEP 0x10 80 #define SMBIOS_OFF 0 81 #define SMBIOS_LEN 4 82 #define SMBIOS_SIG "_SM_" 83 84 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res)) 85 #define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr)) 86 87 static devclass_t smbios_devclass; 88 89 static void smbios_identify (driver_t *, device_t); 90 static int smbios_probe (device_t); 91 static int smbios_attach (device_t); 92 static int smbios_detach (device_t); 93 static int smbios_modevent (module_t, int, void *); 94 95 static int smbios_cksum (struct smbios_eps *); 96 97 static void 98 smbios_identify (driver_t *driver, device_t parent) 99 { 100 device_t child; 101 u_int32_t addr; 102 int length; 103 int rid; 104 105 if (!device_is_alive(parent)) 106 return; 107 108 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 109 SMBIOS_STEP, SMBIOS_OFF); 110 if (addr != 0) { 111 rid = 0; 112 length = ADDR2EPS(addr)->Length; 113 114 child = BUS_ADD_CHILD(parent, 0, "smbios", -1); 115 device_set_driver(child, driver); 116 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 117 device_set_desc(child, "System Management BIOS"); 118 } 119 120 return; 121 } 122 123 static int 124 smbios_probe (device_t dev) 125 { 126 struct resource *res; 127 int rid; 128 int error; 129 130 error = 0; 131 rid = 0; 132 res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, 133 0ul, ~0ul, 1, RF_ACTIVE); 134 if (res == NULL) { 135 device_printf(dev, "Unable to allocate memory resource.\n"); 136 error = ENOMEM; 137 goto bad; 138 } 139 140 if (smbios_cksum(RES2EPS(res))) { 141 device_printf(dev, "SMBIOS checksum failed.\n"); 142 error = ENXIO; 143 goto bad; 144 } 145 146 bad: 147 if (res) 148 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 149 return (error); 150 } 151 152 static int 153 smbios_attach (device_t dev) 154 { 155 struct smbios_softc *sc; 156 int error; 157 158 sc = device_get_softc(dev); 159 error = 0; 160 161 sc->dev = dev; 162 sc->rid = 0; 163 sc->res = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->rid, 164 0ul, ~0ul, 1, RF_ACTIVE); 165 if (sc->res == NULL) { 166 device_printf(dev, "Unable to allocate memory resource.\n"); 167 error = ENOMEM; 168 goto bad; 169 } 170 sc->eps = RES2EPS(sc->res); 171 172 device_printf(dev, "Version: %d.%02d", 173 sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor); 174 if (bcd2bin(sc->eps->SMBIOS_BCD_Revision)) 175 printf(", Revision: %d.%02d", 176 bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4), 177 bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f)); 178 printf("\n"); 179 180 return (0); 181 bad: 182 if (sc->res) 183 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 184 return (error); 185 } 186 187 static int 188 smbios_detach (device_t dev) 189 { 190 struct smbios_softc *sc; 191 192 sc = device_get_softc(dev); 193 194 if (sc->res) 195 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 196 197 return (0); 198 } 199 200 static int 201 smbios_modevent (mod, what, arg) 202 module_t mod; 203 int what; 204 void * arg; 205 { 206 device_t * devs; 207 int count; 208 int i; 209 210 switch (what) { 211 case MOD_LOAD: 212 break; 213 case MOD_UNLOAD: 214 devclass_get_devices(smbios_devclass, &devs, &count); 215 for (i = 0; i < count; i++) { 216 device_delete_child(device_get_parent(devs[i]), devs[i]); 217 } 218 break; 219 default: 220 break; 221 } 222 223 return (0); 224 } 225 226 static device_method_t smbios_methods[] = { 227 /* Device interface */ 228 DEVMETHOD(device_identify, smbios_identify), 229 DEVMETHOD(device_probe, smbios_probe), 230 DEVMETHOD(device_attach, smbios_attach), 231 DEVMETHOD(device_detach, smbios_detach), 232 { 0, 0 } 233 }; 234 235 static driver_t smbios_driver = { 236 "smbios", 237 smbios_methods, 238 sizeof(struct smbios_softc), 239 }; 240 241 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0); 242 MODULE_VERSION(smbios, 1); 243 244 static int 245 smbios_cksum (struct smbios_eps *e) 246 { 247 u_int8_t *ptr; 248 u_int8_t cksum; 249 int i; 250 251 ptr = (u_int8_t *)e; 252 cksum = 0; 253 for (i = 0; i < e->Length; i++) { 254 cksum += ptr[i]; 255 } 256 257 return (cksum); 258 }
Cache object: f91df22f1017c39bf685cb3ae3d4a3b9
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