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 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.2/sys/i386/bios/mca_machdep.c 295880 2016-02-22 09:02:20Z skra $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/systm.h>
   32 #include <sys/kernel.h>
   33 #include <vm/vm.h>
   34 #include <vm/vm_param.h>
   35 #include <vm/pmap.h>
   36 #include <machine/md_var.h>
   37 #include <machine/vm86.h>
   38 #include <machine/pc/bios.h>
   39 #include <machine/cpufunc.h>
   40 
   41 #include <dev/mca/mca_busreg.h>
   42 #include <i386/bios/mca_machdep.h>
   43 
   44 /* Global MCA bus flag */
   45 int MCA_system = 0;
   46 
   47 /* System Configuration Block */
   48 struct sys_config {
   49         u_int16_t       count;
   50         u_int8_t        model;
   51         u_int8_t        submodel;
   52         u_int8_t        bios_rev;
   53         u_int8_t        feature;
   54 #define FEATURE_MCAISA  0x01    /* Machine contains both MCA and ISA bus*/
   55 #define FEATURE_MCABUS  0x02    /* MicroChannel Architecture            */
   56 #define FEATURE_EBDA    0x04    /* Extended BIOS data area allocated    */
   57 #define FEATURE_WAITEV  0x08    /* Wait for external event is supported */
   58 #define FEATURE_KBDINT  0x10    /* Keyboard intercept called by Int 09h */
   59 #define FEATURE_RTC     0x20    /* Real-time clock present              */
   60 #define FEATURE_IC2     0x40    /* Second interrupt chip present        */
   61 #define FEATURE_DMA3    0x80    /* DMA channel 3 used by hard disk BIOS */
   62         u_int8_t        pad[3];
   63 } __packed;
   64 
   65 /* Function Prototypes */
   66 static void bios_mcabus_present (void *);
   67 SYSINIT(mca_present, SI_SUB_CPU, SI_ORDER_ANY, bios_mcabus_present, NULL);
   68 
   69 /* Functions */
   70 static void
   71 bios_mcabus_present(void * dummy)
   72 {
   73         struct vm86frame        vmf;
   74         struct sys_config *     scp;
   75         vm_offset_t             paddr;
   76 
   77         bzero(&vmf, sizeof(struct vm86frame));
   78 
   79         vmf.vmf_ah = 0xc0;
   80         if (vm86_intcall(0x15, &vmf)) {
   81                 if (bootverbose) {
   82                         printf("BIOS SDT: INT call failed.\n");
   83                 }
   84                 return;
   85         }
   86 
   87         if ((vmf.vmf_ah != 0) && (vmf.vmf_flags & 0x01)) {
   88                 if (bootverbose) {
   89                         printf("BIOS SDT: Not supported.  Not PS/2?\n");
   90                         printf("BIOS SDT: AH 0x%02x, Flags 0x%04x\n",
   91                                 vmf.vmf_ah, vmf.vmf_flags);
   92                 }
   93                 return;
   94         }
   95 
   96         paddr = vmf.vmf_es;
   97         paddr = (paddr << 4) + vmf.vmf_bx;
   98         scp = (struct sys_config *)BIOS_PADDRTOVADDR(paddr);
   99 
  100         if (bootverbose) {
  101                 printf("BIOS SDT: model 0x%02x, submodel 0x%02x, bios_rev 0x%02x\n",
  102                         scp->model, scp->submodel, scp->bios_rev);
  103                 printf("BIOS SDT: features 0x%b\n", scp->feature,
  104                         "\2"
  105                         "\01MCA+ISA"
  106                         "\02MCA"
  107                         "\03EBDA"
  108                         "\04WAITEV"
  109                         "\05KBDINT"
  110                         "\06RTC"
  111                         "\07IC2"
  112                         "\08DMA3"
  113                         "\n");
  114         }
  115 
  116         MCA_system = ((scp->feature & FEATURE_MCABUS) ? 1 : 0);
  117 
  118         if (MCA_system)
  119                 printf("MicroChannel Architecture System detected.\n");
  120 
  121         return;
  122 }
  123 
  124 int
  125 mca_bus_nmi (void)
  126 {
  127         int     slot;
  128         int     retval = 0;
  129         int     pos5 = 0;
  130 
  131         /* Disable motherboard setup */
  132         outb(MCA_MB_SETUP_REG, MCA_MB_SETUP_DIS);
  133 
  134         /* For each slot */
  135         for (slot = 0; slot < MCA_MAX_SLOTS; slot++) {
  136 
  137                 /* Select the slot */
  138                 outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET); 
  139                 pos5 = inb(MCA_POS_REG(MCA_POS5));
  140 
  141                 /* If Adapter Check is low */
  142                 if ((pos5 & MCA_POS5_CHCK) == 0) {
  143                         retval++;
  144 
  145                         /* If Adapter Check Status is available */
  146                         if ((pos5 & MCA_POS5_CHCK_STAT) == 0) {
  147                                 printf("MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n",
  148                                         slot+1,
  149                                         inb( MCA_POS_REG(MCA_POS6) ),
  150                                         inb( MCA_POS_REG(MCA_POS7) ));
  151                         } else { 
  152                                 printf("MCA NMI: slot %d\n", slot+1);
  153                         }
  154                 }
  155                 /* Disable adapter setup */
  156                 outb(MCA_ADAP_SETUP_REG, MCA_ADAP_SETUP_DIS);
  157         }
  158 
  159         return (retval);
  160 }

Cache object: 98e192edf4eb9b73903f753245d53e37


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