smbios.c

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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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/10.2/sys/x86/bios/smbios.c 241073 2012-09-30 15:42:20Z kevlo $");
   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 
   54 struct 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 
   65 static devclass_t       smbios_devclass;
   66 
   67 static void     smbios_identify (driver_t *, device_t);
   68 static int      smbios_probe    (device_t);
   69 static int      smbios_attach   (device_t);
   70 static int      smbios_detach   (device_t);
   71 static int      smbios_modevent (module_t, int, void *);
   72 
   73 static int      smbios_cksum    (struct smbios_eps *);
   74 
   75 static void
   76 smbios_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 
  114 static int
  115 smbios_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 
  136 bad:
  137         if (res)
  138                 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
  139         return (error);
  140 }
  141 
  142 static int
  143 smbios_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);
  171 bad:
  172         if (sc->res)
  173                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  174         return (error);
  175 }
  176 
  177 static int
  178 smbios_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 
  190 static int
  191 smbios_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 
  217 static 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 
  226 static driver_t smbios_driver = {
  227         "smbios",
  228         smbios_methods,
  229         sizeof(struct smbios_softc),
  230 };
  231 
  232 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
  233 MODULE_VERSION(smbios, 1);
  234 
  235 static int
  236 smbios_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 }

Cache object: 62a3bf063e7df037c504201ce916dc4d

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FreeBSD/Linux Kernel Cross Reference sys/x86/bios/smbios.c

FreeBSD/Linux Kernel Cross Reference
sys/x86/bios/smbios.c