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/6.0/sys/i386/bios/smbios.c 151036 2005-10-06 20:43:44Z jkim $");
   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/vm_param.h>
   44 #include <vm/pmap.h>
   45 #include <machine/md_var.h>
   46 #include <machine/pc/bios.h>
   47 
   48 /*
   49  * System Management BIOS Reference Specification, v2.4 Final
   50  * http://www.dmtf.org/standards/published_documents/DSP0134.pdf
   51  */
   52 
   53 /*
   54  * SMBIOS Entry Point Structure
   55  */
   56 struct smbios_eps {
   57         u_int8_t        Anchor[4];              /* '_SM_' */
   58         u_int8_t        Checksum;
   59         u_int8_t        Length;
   60 
   61         u_int8_t        SMBIOS_Major;
   62         u_int8_t        SMBIOS_Minor;
   63         u_int16_t       Max_Size;
   64         u_int8_t        Revision;
   65         u_int8_t        Formatted_Area[5];
   66 
   67         u_int8_t        Intermediate_Anchor[5]; /* '_DMI_' */
   68         u_int8_t        Intermediate_Checksum;
   69 
   70         u_int16_t       Structure_Table_Length;
   71         u_int32_t       Structure_Table_Address;
   72         u_int16_t       Structure_Count;
   73 
   74         u_int8_t        SMBIOS_BCD_Revision;
   75 } __packed;
   76 
   77 struct smbios_softc {
   78         device_t                dev;
   79         struct resource *       res;
   80         int                     rid;
   81 
   82         struct smbios_eps *     eps;
   83 };
   84 
   85 #define SMBIOS_START    0xf0000
   86 #define SMBIOS_STEP     0x10
   87 #define SMBIOS_OFF      0
   88 #define SMBIOS_LEN      4
   89 #define SMBIOS_SIG      "_SM_"
   90 
   91 #define RES2EPS(res)    ((struct smbios_eps *)rman_get_virtual(res))
   92 #define ADDR2EPS(addr)  ((struct smbios_eps *)BIOS_PADDRTOVADDR(addr))
   93 
   94 static devclass_t       smbios_devclass;
   95 
   96 static void     smbios_identify (driver_t *, device_t);
   97 static int      smbios_probe    (device_t);
   98 static int      smbios_attach   (device_t);
   99 static int      smbios_detach   (device_t);
  100 static int      smbios_modevent (module_t, int, void *);
  101 
  102 static int      smbios_cksum    (struct smbios_eps *);
  103 
  104 static void
  105 smbios_identify (driver_t *driver, device_t parent)
  106 {
  107         device_t child;
  108         u_int32_t addr;
  109         int length;
  110         int rid;
  111 
  112         if (!device_is_alive(parent))
  113                 return;
  114 
  115         addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
  116                               SMBIOS_STEP, SMBIOS_OFF);
  117         if (addr != 0) {
  118                 rid = 0;
  119                 length = ADDR2EPS(addr)->Length;
  120 
  121                 if (length != 0x1f) {
  122                         u_int8_t major, minor;
  123 
  124                         major = ADDR2EPS(addr)->SMBIOS_Major;
  125                         minor = ADDR2EPS(addr)->SMBIOS_Minor;
  126 
  127                         /* SMBIOS v2.1 implementation might use 0x1e. */
  128                         if (length == 0x1e && major == 2 && minor == 1)
  129                                 length = 0x1f;
  130                         else
  131                                 return;
  132                 }
  133 
  134                 child = BUS_ADD_CHILD(parent, 0, "smbios", -1);
  135                 device_set_driver(child, driver);
  136                 bus_set_resource(child, SYS_RES_MEMORY, rid, addr, length);
  137                 device_set_desc(child, "System Management BIOS");
  138         }
  139 
  140         return;
  141 }
  142 
  143 static int
  144 smbios_probe (device_t dev)
  145 {
  146         struct resource *res;
  147         int rid;
  148         int error;
  149 
  150         error = 0;
  151         rid = 0;
  152         res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
  153         if (res == NULL) {
  154                 device_printf(dev, "Unable to allocate memory resource.\n");
  155                 error = ENOMEM;
  156                 goto bad;
  157         }
  158 
  159         if (smbios_cksum(RES2EPS(res))) {
  160                 device_printf(dev, "SMBIOS checksum failed.\n");
  161                 error = ENXIO;
  162                 goto bad;
  163         }
  164 
  165 bad:
  166         if (res)
  167                 bus_release_resource(dev, SYS_RES_MEMORY, rid, res);
  168         return (error);
  169 }
  170 
  171 static int
  172 smbios_attach (device_t dev)
  173 {
  174         struct smbios_softc *sc;
  175         int error;
  176 
  177         sc = device_get_softc(dev);
  178         error = 0;
  179 
  180         sc->dev = dev;
  181         sc->rid = 0;
  182         sc->res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->rid,
  183                 RF_ACTIVE);
  184         if (sc->res == NULL) {
  185                 device_printf(dev, "Unable to allocate memory resource.\n");
  186                 error = ENOMEM;
  187                 goto bad;
  188         }
  189         sc->eps = RES2EPS(sc->res);
  190 
  191         device_printf(dev, "Version: %u.%u",
  192                 sc->eps->SMBIOS_Major, sc->eps->SMBIOS_Minor);
  193         if (bcd2bin(sc->eps->SMBIOS_BCD_Revision))
  194                 printf(", BCD Revision: %u.%u",
  195                         bcd2bin(sc->eps->SMBIOS_BCD_Revision >> 4),
  196                         bcd2bin(sc->eps->SMBIOS_BCD_Revision & 0x0f));
  197         printf("\n");
  198 
  199         return (0);
  200 bad:
  201         if (sc->res)
  202                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  203         return (error);
  204 }
  205 
  206 static int
  207 smbios_detach (device_t dev)
  208 {
  209         struct smbios_softc *sc;
  210 
  211         sc = device_get_softc(dev);
  212 
  213         if (sc->res)
  214                 bus_release_resource(dev, SYS_RES_MEMORY, sc->rid, sc->res);
  215 
  216         return (0);
  217 }
  218 
  219 static int
  220 smbios_modevent (mod, what, arg)
  221         module_t        mod;
  222         int             what;
  223         void *          arg;
  224 {
  225         device_t *      devs;
  226         int             count;
  227         int             i;
  228 
  229         switch (what) {
  230         case MOD_LOAD:
  231                 break;
  232         case MOD_UNLOAD:
  233                 devclass_get_devices(smbios_devclass, &devs, &count);
  234                 for (i = 0; i < count; i++) {
  235                         device_delete_child(device_get_parent(devs[i]), devs[i]);
  236                 }
  237                 break;
  238         default:
  239                 break;
  240         }
  241 
  242         return (0);
  243 }
  244 
  245 static device_method_t smbios_methods[] = {
  246         /* Device interface */
  247         DEVMETHOD(device_identify,      smbios_identify),
  248         DEVMETHOD(device_probe,         smbios_probe),
  249         DEVMETHOD(device_attach,        smbios_attach),
  250         DEVMETHOD(device_detach,        smbios_detach),
  251         { 0, 0 }
  252 };
  253 
  254 static driver_t smbios_driver = {
  255         "smbios",
  256         smbios_methods,
  257         sizeof(struct smbios_softc),
  258 };
  259 
  260 DRIVER_MODULE(smbios, nexus, smbios_driver, smbios_devclass, smbios_modevent, 0);
  261 MODULE_VERSION(smbios, 1);
  262 
  263 static int
  264 smbios_cksum (struct smbios_eps *e)
  265 {
  266         u_int8_t *ptr;
  267         u_int8_t cksum;
  268         int i;
  269 
  270         ptr = (u_int8_t *)e;
  271         cksum = 0;
  272         for (i = 0; i < e->Length; i++) {
  273                 cksum += ptr[i];
  274         }
  275 
  276         return (cksum);
  277 }

Cache object: d593a434c8bac3d42ef0dc8aa0f1c3c2


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