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/mca_machdep.c

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    1 /*-
    2  * Copyright (c) 1999 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  * $FreeBSD: releng/5.0/sys/i386/bios/mca_machdep.c 103870 2002-09-23 18:54:32Z alfred $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/systm.h>
   31 #include <sys/kernel.h>
   32 #include <vm/vm.h>
   33 #include <vm/pmap.h>
   34 #include <machine/pmap.h>
   35 #include <machine/md_var.h>
   36 #include <machine/vm86.h>
   37 #include <machine/pc/bios.h>
   38 #include <machine/cpufunc.h>
   39 
   40 #include <dev/mca/mca_busreg.h>
   41 #include <i386/isa/mca_machdep.h>
   42 
   43 /* Global MCA bus flag */
   44 int MCA_system = 0;
   45 
   46 /* System Configuration Block */
   47 struct sys_config {
   48         u_int16_t       count;
   49         u_int8_t        model;
   50         u_int8_t        submodel;
   51         u_int8_t        bios_rev;
   52         u_int8_t        feature;
   53 #define FEATURE_RESV    0x01    /* Reserved                             */
   54 #define FEATURE_MCABUS  0x02    /* MicroChannel Architecture            */
   55 #define FEATURE_EBDA    0x04    /* Extended BIOS data area allocated    */
   56 #define FEATURE_WAITEV  0x08    /* Wait for external event is supported */
   57 #define FEATURE_KBDINT  0x10    /* Keyboard intercept called by Int 09h */
   58 #define FEATURE_RTC     0x20    /* Real-time clock present              */
   59 #define FEATURE_IC2     0x40    /* Second interrupt chip present        */
   60 #define FEATURE_DMA3    0x80    /* DMA channel 3 used by hard disk BIOS */
   61         u_int8_t        pad[3];
   62 } __packed;
   63 
   64 /* Function Prototypes */
   65 static void bios_mcabus_present (void *);
   66 SYSINIT(mca_present, SI_SUB_CPU, SI_ORDER_ANY, bios_mcabus_present, NULL);
   67 
   68 /* Functions */
   69 static void
   70 bios_mcabus_present(void * dummy)
   71 {
   72         struct vm86frame        vmf;
   73         struct sys_config *     scp;
   74         vm_offset_t             paddr;
   75 
   76         bzero(&vmf, sizeof(struct vm86frame));
   77 
   78         vmf.vmf_ah = 0xc0;
   79         if (vm86_intcall(0x15, &vmf)) {
   80                 if (bootverbose) {
   81                         printf("BIOS SDT: INT call failed.\n");
   82                 }
   83                 return;
   84         }
   85 
   86         if ((vmf.vmf_ah != 0) && (vmf.vmf_flags & 0x01)) {
   87                 if (bootverbose) {
   88                         printf("BIOS SDT: Not supported.  Not PS/2?\n");
   89                         printf("BIOS SDT: AH 0x%02x, Flags 0x%04x\n",
   90                                 vmf.vmf_ah, vmf.vmf_flags);
   91                 }
   92                 return;
   93         }
   94 
   95         paddr = vmf.vmf_es;
   96         paddr = (paddr << 4) + vmf.vmf_bx;
   97         scp = (struct sys_config *)BIOS_PADDRTOVADDR(paddr);
   98 
   99         if (bootverbose) {
  100                 printf("BIOS SDT: model 0x%02x, submodel 0x%02x, bios_rev 0x%02x\n",
  101                         scp->model, scp->submodel, scp->bios_rev);
  102                 printf("BIOS SDT: features 0x%b\n", scp->feature,
  103                         "\2"
  104                         "\01RESV"
  105                         "\02MCABUS"
  106                         "\03EBDA"
  107                         "\04WAITEV"
  108                         "\05KBDINT"
  109                         "\06RTC"
  110                         "\07IC2"
  111                         "\08DMA3\n");
  112         }
  113 
  114         MCA_system = ((scp->feature & FEATURE_MCABUS) ? 1 : 0);
  115 
  116         if (MCA_system)
  117                 printf("MicroChannel Architecture System detected.\n");
  118 
  119         return;
  120 }
  121 
  122 int
  123 mca_bus_nmi (void)
  124 {
  125         int     slot;
  126         int     retval = 0;
  127         int     pos5 = 0;
  128 
  129         /* Disable motherboard setup */
  130         outb(MCA_MB_SETUP_REG, MCA_MB_SETUP_DIS);
  131 
  132         /* For each slot */
  133         for (slot = 0; slot < MCA_MAX_SLOTS; slot++) {
  134 
  135                 /* Select the slot */
  136                 outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET); 
  137                 pos5 = inb(MCA_POS_REG(MCA_POS5));
  138 
  139                 /* If Adapter Check is low */
  140                 if ((pos5 & MCA_POS5_CHCK) == 0) {
  141                         retval++;
  142 
  143                         /* If Adapter Check Status is available */
  144                         if ((pos5 & MCA_POS5_CHCK_STAT) == 0) {
  145                                 printf("MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n",
  146                                         slot+1,
  147                                         inb( MCA_POS_REG(MCA_POS6) ),
  148                                         inb( MCA_POS_REG(MCA_POS7) ));
  149                         } else { 
  150                                 printf("MCA NMI: slot %d\n", slot+1);
  151                         }
  152                 }
  153                 /* Disable adapter setup */
  154                 outb(MCA_ADAP_SETUP_REG, MCA_ADAP_SETUP_DIS);
  155         }
  156 
  157         return (retval);
  158 }

Cache object: ccec1d81c345c786b3f0ce3ecd3d127d


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