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 #include <sys/efi.h> 38 39 #include <sys/module.h> 40 #include <sys/bus.h> 41 42 #include <machine/bus.h> 43 #include <machine/resource.h> 44 #include <sys/rman.h> 45 46 #include <vm/vm.h> 47 #include <vm/vm_param.h> 48 #include <vm/pmap.h> 49 #include <machine/md_var.h> 50 #if defined(__amd64__) || defined(__i386__) 51 #include <machine/pc/bios.h> 52 #endif 53 #include <dev/smbios/smbios.h> 54 55 /* 56 * System Management BIOS Reference Specification, v2.4 Final 57 * http://www.dmtf.org/standards/published_documents/DSP0134.pdf 58 */ 59 60 struct smbios_softc { 61 device_t dev; 62 struct resource * res; 63 int rid; 64 65 struct smbios_eps * eps; 66 }; 67 68 #define RES2EPS(res) ((struct smbios_eps *)rman_get_virtual(res)) 69 70 static void smbios_identify (driver_t *, device_t); 71 static int smbios_probe (device_t); 72 static int smbios_attach (device_t); 73 static int smbios_detach (device_t); 74 static int smbios_modevent (module_t, int, void *); 75 76 static int smbios_cksum (struct smbios_eps *); 77 78 static void 79 smbios_identify (driver_t *driver, device_t parent) 80 { 81 #ifdef ARCH_MAY_USE_EFI 82 struct uuid efi_smbios = EFI_TABLE_SMBIOS; 83 void *addr_efi; 84 #endif 85 struct smbios_eps *eps; 86 device_t child; 87 vm_paddr_t addr = 0; 88 int length; 89 int rid; 90 91 if (!device_is_alive(parent)) 92 return; 93 94 #ifdef ARCH_MAY_USE_EFI 95 if (!efi_get_table(&efi_smbios, &addr_efi)) 96 addr = (vm_paddr_t)addr_efi; 97 #endif 98 99 #if defined(__amd64__) || defined(__i386__) 100 if (addr == 0) 101 addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN, 102 SMBIOS_STEP, SMBIOS_OFF); 103 #endif 104 105 if (addr != 0) { 106 eps = pmap_mapbios(addr, 0x1f); 107 rid = 0; 108 length = eps->length; 109 110 if (length != 0x1f) { 111 u_int8_t major, minor; 112 113 major = eps->major_version; 114 minor = eps->minor_version; 115 116 /* SMBIOS v2.1 implementation might use 0x1e. */ 117 if (length == 0x1e && major == 2 && minor == 1) 118 length = 0x1f; 119 else 120 return; 121 } 122 123 child = BUS_ADD_CHILD(parent, 5, "smbios", -1); 124 device_set_driver(child, driver); 125 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length); 126 device_set_desc(child, "System Management BIOS"); 127 pmap_unmapbios((vm_offset_t)eps, 0x1f); 128 } 129 130 return; 131 } 132 133 static int 134 smbios_probe (device_t dev) 135 { 136 struct resource *res; 137 int rid; 138 int error; 139 140 error = 0; 141 rid = 0; 142 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 143 if (res == NULL) { 144 device_printf(dev, "Unable to allocate memory resource.\n"); 145 error = ENOMEM; 146 goto bad; 147 } 148 149 if (smbios_cksum(RES2EPS(res))) { 150 device_printf(dev, "SMBIOS checksum failed.\n"); 151 error = ENXIO; 152 goto bad; 153 } 154 155 bad: 156 if (res) 157 bus_release_resource(dev, SYS_RES_MEMORY, rid, res); 158 return (error); 159 } 160 161 static int 162 smbios_attach (device_t dev) 163 { 164 struct smbios_softc *sc; 165 int error; 166 167 sc = device_get_softc(dev); 168 error = 0; 169 170 sc->dev = dev; 171 sc->rid = 0; 172 sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid, 173 RF_ACTIVE); 174 if (sc->res == NULL) { 175 device_printf(dev, "Unable to allocate memory resource.\n"); 176 error = ENOMEM; 177 goto bad; 178 } 179 sc->eps = RES2EPS(sc->res); 180 181 device_printf(dev, "Version: %u.%u", 182 sc->eps->major_version, sc->eps->minor_version); 183 if (bcd2bin(sc->eps->BCD_revision)) 184 printf(", BCD Revision: %u.%u", 185 bcd2bin(sc->eps->BCD_revision >> 4), 186 bcd2bin(sc->eps->BCD_revision & 0x0f)); 187 printf("\n"); 188 189 return (0); 190 bad: 191 if (sc->res) 192 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 193 return (error); 194 } 195 196 static int 197 smbios_detach (device_t dev) 198 { 199 struct smbios_softc *sc; 200 201 sc = device_get_softc(dev); 202 203 if (sc->res) 204 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res); 205 206 return (0); 207 } 208 209 static int 210 smbios_modevent (module_t mod, int what, void *arg) 211 { 212 device_t * devs; 213 int count; 214 int i; 215 216 switch (what) { 217 case MOD_LOAD: 218 break; 219 case MOD_UNLOAD: 220 devclass_get_devices(devclass_find("smbios"), &devs, &count); 221 for (i = 0; i < count; i++) { 222 device_delete_child(device_get_parent(devs[i]), devs[i]); 223 } 224 free(devs, M_TEMP); 225 break; 226 default: 227 break; 228 } 229 230 return (0); 231 } 232 233 static device_method_t smbios_methods[] = { 234 /* Device interface */ 235 DEVMETHOD(device_identify, smbios_identify), 236 DEVMETHOD(device_probe, smbios_probe), 237 DEVMETHOD(device_attach, smbios_attach), 238 DEVMETHOD(device_detach, smbios_detach), 239 { 0, 0 } 240 }; 241 242 static driver_t smbios_driver = { 243 "smbios", 244 smbios_methods, 245 sizeof(struct smbios_softc), 246 }; 247 248 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_modevent, NULL); 249 #ifdef ARCH_MAY_USE_EFI 250 MODULE_DEPEND(smbios, efirt, 1, 1, 1); 251 #endif 252 MODULE_VERSION(smbios, 1); 253 254 static int 255 smbios_cksum (struct smbios_eps *e) 256 { 257 u_int8_t *ptr; 258 u_int8_t cksum; 259 int i; 260 261 ptr = (u_int8_t *)e; 262 cksum = 0; 263 for (i = 0; i < e->length; i++) { 264 cksum += ptr[i]; 265 } 266 267 return (cksum); 268 } 269