smbios.c

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    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(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 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/smbios/smbios.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/smbios/smbios.c