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("$FreeBSD$"); 29 30#include <sys/param.h> 31#include <sys/systm.h> 32#include <sys/kernel.h> 33#include <sys/malloc.h> 34#include <sys/socket.h> 35 36#include <sys/module.h> 37#include <sys/bus.h> 38 39#include <machine/bus.h> 40#include <machine/resource.h> 41#include <sys/rman.h> 42 43#include <vm/vm.h> 44#include <vm/vm_param.h> 45#include <vm/pmap.h> 46#include <machine/md_var.h> 47#include <machine/pc/bios.h> 48 49/* 50 * System Management BIOS Reference Specification, v2.4 Final 51 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf 52 */ 53 54struct smbios_softc { 55 device_t dev; 56 struct resource * res; 57 int rid; 58 59 struct smbios_eps * eps; 60}; 61 62#define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res)) 63#define ADDR2EPS(addr) ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr)) 64 65static devclass_t smbios_devclass; 66 67static void smbios_identify (driver_t *, device_t); 68static int smbios_probe (device_t); 69static int smbios_attach (device_t); 70static int smbios_detach (device_t); 71static int smbios_modevent (module_t, int, void *); 72 73static int smbios_cksum (struct smbios_eps *); 74 75static void 76smbios_identify (driver_t *driver, device_t parent) 77{ 78 device_t child; 79 u_int32_t addr; 80 int length; 81 int rid; 82 83 if (!device_is_alive(parent)) 84 return; 85 86 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 87 SMBIOS_STEP, SMBIOS_OFF); 88 if (addr != 0) { 89 rid = 0; 90 length = ADDR2EPS(addr)->length; 91 92 if (length != 0x1f) { 93 u_int8_t major, minor; 94 95 major = ADDR2EPS(addr)->major_version; 96 minor = ADDR2EPS(addr)->minor_version; 97 98 /* SMBIOS v2.1 implementation might use 0x1e. */ 99 if (length == 0x1e && major == 2 && minor == 1) 100 length = 0x1f; 101 else 102 return; 103 } 104 105 child = BUS_ADD_CHILD(parent, 5, "smbios", -1); 106 device_set_driver(child, driver); 107 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 108 device_set_desc(child, "System Management BIOS"); 109 } 110 111 return; 112} 113 114static int 115smbios_probe (device_t dev) 116{ 117 struct resource *res; 118 int rid; 119 int error; 120 121 error = 0; 122 rid = 0; 123 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 124 if (res == NULL) { 125 device_printf(dev, "Unable to allocate memory resource.\n"); 126 error = ENOMEM; 127 goto bad; 128 } 129 130 if (smbios_cksum(RES2EPS(res))) { 131 device_printf(dev, "SMBIOS checksum failed.\n"); 132 error = ENXIO; 133 goto bad; 134 } 135 136bad: 137 if (res) 138 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 139 return (error); 140} 141 142static int 143smbios_attach (device_t dev) 144{ 145 struct smbios_softc *sc; 146 int error; 147 148 sc = device_get_softc(dev); 149 error = 0; 150 151 sc->dev = dev; 152 sc->rid = 0; 153 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 154 RF_ACTIVE); 155 if (sc->res == NULL) { 156 device_printf(dev, "Unable to allocate memory resource.\n"); 157 error = ENOMEM; 158 goto bad; 159 } 160 sc->eps = RES2EPS(sc->res); 161 162 device_printf(dev, "Version: %u.%u", 163 sc->eps->major_version, sc->eps->minor_version); 164 if (bcd2bin(sc->eps->BCD_revision)) 165 printf(", BCD Revision: %u.%u", 166 bcd2bin(sc->eps->BCD_revision >> 4), 167 bcd2bin(sc->eps->BCD_revision & 0x0f)); 168 printf("\n"); 169 170 return (0); 171bad: 172 if (sc->res) 173 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 174 return (error); 175} 176 177static int 178smbios_detach (device_t dev) 179{ 180 struct smbios_softc *sc; 181 182 sc = device_get_softc(dev); 183 184 if (sc->res) 185 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 186 187 return (0); 188} 189 190static int 191smbios_modevent (mod, what, arg) 192 module_t mod; 193 int what; 194 void * arg; 195{ 196 device_t * devs; 197 int count; 198 int i; 199 200 switch (what) { 201 case MOD_LOAD: 202 break; 203 case MOD_UNLOAD: 204 devclass_get_devices(smbios_devclass, &devs, &count); 205 for (i = 0; i < count; i++) { 206 device_delete_child(device_get_parent(devs[i]), devs[i]); 207 } 208 free(devs, M_TEMP); 209 break; 210 default: 211 break; 212 } 213 214 return (0); 215} 216 217static device_method_t smbios_methods[] = { 218 /* Device interface */ 219 DEVMETHOD(device_identify, smbios_identify), 220 DEVMETHOD(device_probe, smbios_probe), 221 DEVMETHOD(device_attach, smbios_attach), 222 DEVMETHOD(device_detach, smbios_detach), 223 { 0, 0 } 224}; 225 226static driver_t smbios_driver = { 227 "smbios", 228 smbios_methods, 229 sizeof(struct smbios_softc), 230}; 231 232DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0); 233MODULE_VERSION(smbios, 1); 234 235static int 236smbios_cksum (struct smbios_eps *e) 237{ 238 u_int8_t *ptr; 239 u_int8_t cksum; 240 int i; 241 242 ptr = (u_int8_t *)e; 243 cksum = 0; 244 for (i = 0; i < e->length; i++) { 245 cksum += ptr[i]; 246 } 247 248 return (cksum); 249} 250