smbios.c revision 127135
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 27#include <sys/cdefs.h> 28__FBSDID("$FreeBSD: head/sys/i386/bios/smbios.c 127135 2004-03-17 17:50:55Z njl $"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/socket.h> 34 35#include <sys/module.h> 36#include <sys/bus.h> 37 38#include <machine/bus.h> 39#include <machine/resource.h> 40#include <sys/rman.h> 41 42#include <vm/vm.h> 43#include <vm/pmap.h> 44#include <machine/md_var.h> 45#include <machine/pc/bios.h> 46 47/* 48 * SMBIOS Entry Point Structure 49 */ 50struct smbios_eps { 51 u_int8_t Anchor[4]; /* '_SM_' */ 52 u_int8_t Checksum; 53 u_int8_t Length; 54 55 u_int8_t SMBIOS_Major; 56 u_int8_t SMBIOS_Minor; 57 u_int8_t Max_Size; 58 u_int8_t Revision; 59 u_int8_t Formatted_Area; 60 61 u_int8_t Intermediate_Anchor[5]; /* '_DMI_' */ 62 u_int8_t Intermediate_Checksum; 63 64 u_int16_t Structure_Table_Length; 65 u_int32_t Structure_Table_Address; 66 u_int16_t Structure_Count; 67 68 u_int8_t SMBIOS_BCD_Revision; 69} __packed; 70 71struct smbios_softc { 72 device_t dev; 73 struct resource * res; 74 int rid; 75 76 struct smbios_eps * eps; 77}; 78 79#define SMBIOS_START 0xf0000 80#define SMBIOS_STEP 0x10 81#define SMBIOS_OFF 0 82#define SMBIOS_LEN 4 83#define SMBIOS_SIG "_SM_" 84 85#define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res)) 86#define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr)) 87 88static devclass_t smbios_devclass; 89 90static void smbios_identify (driver_t *, device_t); 91static int smbios_probe (device_t); 92static int smbios_attach (device_t); 93static int smbios_detach (device_t); 94static int smbios_modevent (module_t, int, void *); 95 96static int smbios_cksum (struct smbios_eps *); 97 98static void 99smbios_identify (driver_t *driver, device_t parent) 100{ 101 device_t child; 102 u_int32_t addr; 103 int length; 104 int rid; 105 106 if (!device_is_alive(parent)) 107 return; 108 109 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 110 SMBIOS_STEP, SMBIOS_OFF); 111 if (addr != 0) { 112 rid = 0; 113 length = ADDR2EPS(addr)->Length; 114 115 child = BUS_ADD_CHILD(parent, 0, "smbios", -1); 116 device_set_driver(child, driver); 117 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 118 device_set_desc(child, "System Management BIOS"); 119 } 120 121 return; 122} 123 124static int 125smbios_probe (device_t dev) 126{ 127 struct resource *res; 128 int rid; 129 int error; 130 131 error = 0; 132 rid = 0; 133 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 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 146bad: 147 if (res) 148 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 149 return (error); 150} 151 152static int 153smbios_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_any(dev, SYS_RES_MEMORY, &sc->rid, 164 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); 181bad: 182 if (sc->res) 183 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 184 return (error); 185} 186 187static int 188smbios_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 200static int 201smbios_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 226static 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 235static driver_t smbios_driver = { 236 "smbios", 237 smbios_methods, 238 sizeof(struct smbios_softc), 239}; 240 241DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0); 242MODULE_VERSION(smbios, 1); 243 244static int 245smbios_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} 259