The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/bios/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/5.2/sys/i386/bios/smbios.c 115679 2003-06-02 06:02:49Z obrien $");
   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  */
   50 struct 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 
   71 struct 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 
   88 static devclass_t       smbios_devclass;
   89 
   90 static void     smbios_identify (driver_t *, device_t);
   91 static int      smbios_probe    (device_t);
   92 static int      smbios_attach   (device_t);
   93 static int      smbios_detach   (device_t);
   94 static int      smbios_modevent (module_t, int, void *);
   95 
   96 static int      smbios_cksum    (struct smbios_eps *);
   97 
   98 static void
   99 smbios_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 
  124 static int
  125 smbios_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(dev, SYS_RES_MEMORY, &rid,
  134                 0ul, ~0ul, 1, RF_ACTIVE);
  135         if (res == NULL) {
  136                 device_printf(dev, "Unable to allocate memory resource.\n");
  137                 error = ENOMEM;
  138                 goto bad;
  139         }
  140 
  141         if (smbios_cksum(RES2EPS(res))) {
  142                 device_printf(dev, "SMBIOS checksum failed.\n");
  143                 error = ENXIO;
  144                 goto bad;
  145         }
  146 
  147 bad:
  148         if (res)
  149                 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
  150         return (error);
  151 }
  152 
  153 static int
  154 smbios_attach (device_t dev)
  155 {
  156         struct smbios_softc *sc;
  157         int error;
  158 
  159         sc = device_get_softc(dev);
  160         error = 0;
  161 
  162         sc->dev = dev;
  163         sc->rid = 0;
  164         sc->res = bus_alloc_resource(dev, SYS_RES_MEMORY, &sc->rid,
  165                 0ul, ~0ul, 1, RF_ACTIVE);
  166         if (sc->res == NULL) {
  167                 device_printf(dev, "Unable to allocate memory resource.\n");
  168                 error = ENOMEM;
  169                 goto bad;
  170         }
  171         sc->eps = RES2EPS(sc->res);
  172 
  173         device_printf(dev, "Version: %d.%02d",
  174                 sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
  175         if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
  176                 printf(", Revision: %d.%02d",
  177                         bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
  178                         bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
  179         printf("\n");
  180 
  181         return (0);
  182 bad:
  183         if (sc->res)
  184                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  185         return (error);
  186 }
  187 
  188 static int
  189 smbios_detach (device_t dev)
  190 {
  191         struct smbios_softc *sc;
  192 
  193         sc = device_get_softc(dev);
  194 
  195         if (sc->res)
  196                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  197 
  198         return (0);
  199 }
  200 
  201 static int
  202 smbios_modevent (mod, what, arg)
  203         module_t        mod;
  204         int             what;
  205         void *          arg;
  206 {
  207         device_t *      devs;
  208         int             count;
  209         int             i;
  210 
  211         switch (what) {
  212         case MOD_LOAD:
  213                 break;
  214         case MOD_UNLOAD:
  215                 devclass_get_devices(smbios_devclass, &devs, &count);
  216                 for (i = 0; i < count; i++) {
  217                         device_delete_child(device_get_parent(devs[i]), devs[i]);
  218                 }
  219                 break;
  220         default:
  221                 break;
  222         }
  223 
  224         return (0);
  225 }
  226 
  227 static device_method_t smbios_methods[] = {
  228         /* Device interface */
  229         DEVMETHOD(device_identify,      smbios_identify),
  230         DEVMETHOD(device_probe,         smbios_probe),
  231         DEVMETHOD(device_attach,        smbios_attach),
  232         DEVMETHOD(device_detach,        smbios_detach),
  233         { 0, 0 }
  234 };
  235 
  236 static driver_t smbios_driver = {
  237         "smbios",
  238         smbios_methods,
  239         sizeof(struct smbios_softc),
  240 };
  241 
  242 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
  243 MODULE_VERSION(smbios, 1);
  244 
  245 static int
  246 smbios_cksum (struct smbios_eps *e)
  247 {
  248         u_int8_t *ptr;
  249         u_int8_t cksum;
  250         int i;
  251 
  252         ptr = (u_int8_t *)e;
  253         cksum = 0;
  254         for (i = 0; i < e->Length; i++) {
  255                 cksum += ptr[i];
  256         }
  257 
  258         return (cksum);
  259 }

Cache object: 3b6c631bb55d6fbdc9bf4932701e7e60


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