1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2003 Matthew N. Dodd <winter@jurai.net> 5 * All rights reserved. 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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/kernel.h> 35 #include <sys/malloc.h> 36 #include <sys/socket.h> 37 38 #include <sys/module.h> 39 #include <sys/bus.h> 40 41 #include <machine/bus.h> 42 #include <machine/resource.h> 43 #include <sys/rman.h> 44 45 #include <vm/vm.h> 46 #include <vm/vm_param.h> 47 #include <vm/pmap.h> 48 #include <machine/md_var.h> 49 #if defined(__amd64__) || defined(__i386__) 50 #include <machine/pc/bios.h> 51 #endif 52 #include <dev/smbios/smbios.h> 53 54 /* 55 * System Management BIOS Reference Specification, v2.4 Final 56 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf 57 */ 58 59 struct smbios_softc { 60 device_t dev; 61 struct resource * res; 62 int rid; 63 64 struct smbios_eps * eps; 65 }; 66 67 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res)) 68 69 static devclass_t smbios_devclass; 70 71 static void smbios_identify (driver_t *, device_t); 72 static int smbios_probe (device_t); 73 static int smbios_attach (device_t); 74 static int smbios_detach (device_t); 75 static int smbios_modevent (module_t, int, void *); 76 77 static int smbios_cksum (struct smbios_eps *); 78 79 static void 80 smbios_identify (driver_t *driver, device_t parent) 81 { 82 struct smbios_eps *eps; 83 device_t child; 84 vm_paddr_t addr; 85 int length; 86 int rid; 87 88 if (!device_is_alive(parent)) 89 return; 90 91 #if defined(__amd64__) || defined(__i386__) 92 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 93 SMBIOS_STEP, SMBIOS_OFF); 94 #else 95 addr = 0; 96 #endif 97 98 if (addr != 0) { 99 eps = pmap_mapbios(addr, 0x1f); 100 rid = 0; 101 length = eps->length; 102 103 if (length != 0x1f) { 104 u_int8_t major, minor; 105 106 major = eps->major_version; 107 minor = eps->minor_version; 108 109 /* SMBIOS v2.1 implementation might use 0x1e. */ 110 if (length == 0x1e && major == 2 && minor == 1) 111 length = 0x1f; 112 else 113 return; 114 } 115 116 child = BUS_ADD_CHILD(parent, 5, "smbios", -1); 117 device_set_driver(child, driver); 118 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 119 device_set_desc(child, "System Management BIOS"); 120 pmap_unmapbios((vm_offset_t)eps, 0x1f); 121 } 122 123 return; 124 } 125 126 static int 127 smbios_probe (device_t dev) 128 { 129 struct resource *res; 130 int rid; 131 int error; 132 133 error = 0; 134 rid = 0; 135 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 136 if (res == NULL) { 137 device_printf(dev, "Unable to allocate memory resource.\n"); 138 error = ENOMEM; 139 goto bad; 140 } 141 142 if (smbios_cksum(RES2EPS(res))) { 143 device_printf(dev, "SMBIOS checksum failed.\n"); 144 error = ENXIO; 145 goto bad; 146 } 147 148 bad: 149 if (res) 150 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 151 return (error); 152 } 153 154 static int 155 smbios_attach (device_t dev) 156 { 157 struct smbios_softc *sc; 158 int error; 159 160 sc = device_get_softc(dev); 161 error = 0; 162 163 sc->dev = dev; 164 sc->rid = 0; 165 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 166 RF_ACTIVE); 167 if (sc->res == NULL) { 168 device_printf(dev, "Unable to allocate memory resource.\n"); 169 error = ENOMEM; 170 goto bad; 171 } 172 sc->eps = RES2EPS(sc->res); 173 174 device_printf(dev, "Version: %u.%u", 175 sc->eps->major_version, sc->eps->minor_version); 176 if (bcd2bin(sc->eps->BCD_revision)) 177 printf(", BCD Revision: %u.%u", 178 bcd2bin(sc->eps->BCD_revision >> 4), 179 bcd2bin(sc->eps->BCD_revision & 0x0f)); 180 printf("\n"); 181 182 return (0); 183 bad: 184 if (sc->res) 185 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 186 return (error); 187 } 188 189 static int 190 smbios_detach (device_t dev) 191 { 192 struct smbios_softc *sc; 193 194 sc = device_get_softc(dev); 195 196 if (sc->res) 197 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 198 199 return (0); 200 } 201 202 static int 203 smbios_modevent (mod, what, arg) 204 module_t mod; 205 int what; 206 void * arg; 207 { 208 device_t * devs; 209 int count; 210 int i; 211 212 switch (what) { 213 case MOD_LOAD: 214 break; 215 case MOD_UNLOAD: 216 devclass_get_devices(smbios_devclass, &devs, &count); 217 for (i = 0; i < count; i++) { 218 device_delete_child(device_get_parent(devs[i]), devs[i]); 219 } 220 free(devs, M_TEMP); 221 break; 222 default: 223 break; 224 } 225 226 return (0); 227 } 228 229 static device_method_t smbios_methods[] = { 230 /* Device interface */ 231 DEVMETHOD(device_identify, smbios_identify), 232 DEVMETHOD(device_probe, smbios_probe), 233 DEVMETHOD(device_attach, smbios_attach), 234 DEVMETHOD(device_detach, smbios_detach), 235 { 0, 0 } 236 }; 237 238 static driver_t smbios_driver = { 239 "smbios", 240 smbios_methods, 241 sizeof(struct smbios_softc), 242 }; 243 244 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0); 245 MODULE_VERSION(smbios, 1); 246 247 static int 248 smbios_cksum (struct smbios_eps *e) 249 { 250 u_int8_t *ptr; 251 u_int8_t cksum; 252 int i; 253 254 ptr = (u_int8_t *)e; 255 cksum = 0; 256 for (i = 0; i < e->length; i++) { 257 cksum += ptr[i]; 258 } 259 260 return (cksum); 261 } 262