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: stable/9/sys/i386/bios/mca_machdep.c 134582 2004-08-31 21:51:51Z mdodd $");
   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/pmap.h>
   37 #include <machine/md_var.h>
   38 #include <machine/vm86.h>
   39 #include <machine/pc/bios.h>
   40 #include <machine/cpufunc.h>
   41 
   42 #include <dev/mca/mca_busreg.h>
   43 #include <i386/bios/mca_machdep.h>
   44 
   45 /* Global MCA bus flag */
   46 int MCA_system = 0;
   47 
   48 /* System Configuration Block */
   49 struct sys_config {
   50         u_int16_t       count;
   51         u_int8_t        model;
   52         u_int8_t        submodel;
   53         u_int8_t        bios_rev;
   54         u_int8_t        feature;
   55 #define FEATURE_MCAISA  0x01    /* Machine contains both MCA and ISA bus*/
   56 #define FEATURE_MCABUS  0x02    /* MicroChannel Architecture            */
   57 #define FEATURE_EBDA    0x04    /* Extended BIOS data area allocated    */
   58 #define FEATURE_WAITEV  0x08    /* Wait for external event is supported */
   59 #define FEATURE_KBDINT  0x10    /* Keyboard intercept called by Int 09h */
   60 #define FEATURE_RTC     0x20    /* Real-time clock present              */
   61 #define FEATURE_IC2     0x40    /* Second interrupt chip present        */
   62 #define FEATURE_DMA3    0x80    /* DMA channel 3 used by hard disk BIOS */
   63         u_int8_t        pad[3];
   64 } __packed;
   65 
   66 /* Function Prototypes */
   67 static void bios_mcabus_present (void *);
   68 SYSINIT(mca_present, SI_SUB_CPU, SI_ORDER_ANY, bios_mcabus_present, NULL);
   69 
   70 /* Functions */
   71 static void
   72 bios_mcabus_present(void * dummy)
   73 {
   74         struct vm86frame        vmf;
   75         struct sys_config *     scp;
   76         vm_offset_t             paddr;
   77 
   78         bzero(&vmf, sizeof(struct vm86frame));
   79 
   80         vmf.vmf_ah = 0xc0;
   81         if (vm86_intcall(0x15, &vmf)) {
   82                 if (bootverbose) {
   83                         printf("BIOS SDT: INT call failed.\n");
   84                 }
   85                 return;
   86         }
   87 
   88         if ((vmf.vmf_ah != 0) && (vmf.vmf_flags & 0x01)) {
   89                 if (bootverbose) {
   90                         printf("BIOS SDT: Not supported.  Not PS/2?\n");
   91                         printf("BIOS SDT: AH 0x%02x, Flags 0x%04x\n",
   92                                 vmf.vmf_ah, vmf.vmf_flags);
   93                 }
   94                 return;
   95         }
   96 
   97         paddr = vmf.vmf_es;
   98         paddr = (paddr << 4) + vmf.vmf_bx;
   99         scp = (struct sys_config *)BIOS_PADDRTOVADDR(paddr);
  100 
  101         if (bootverbose) {
  102                 printf("BIOS SDT: model 0x%02x, submodel 0x%02x, bios_rev 0x%02x\n",
  103                         scp->model, scp->submodel, scp->bios_rev);
  104                 printf("BIOS SDT: features 0x%b\n", scp->feature,
  105                         "\2"
  106                         "\01MCA+ISA"
  107                         "\02MCA"
  108                         "\03EBDA"
  109                         "\04WAITEV"
  110                         "\05KBDINT"
  111                         "\06RTC"
  112                         "\07IC2"
  113                         "\08DMA3"
  114                         "\n");
  115         }
  116 
  117         MCA_system = ((scp->feature & FEATURE_MCABUS) ? 1 : 0);
  118 
  119         if (MCA_system)
  120                 printf("MicroChannel Architecture System detected.\n");
  121 
  122         return;
  123 }
  124 
  125 int
  126 mca_bus_nmi (void)
  127 {
  128         int     slot;
  129         int     retval = 0;
  130         int     pos5 = 0;
  131 
  132         /* Disable motherboard setup */
  133         outb(MCA_MB_SETUP_REG, MCA_MB_SETUP_DIS);
  134 
  135         /* For each slot */
  136         for (slot = 0; slot < MCA_MAX_SLOTS; slot++) {
  137 
  138                 /* Select the slot */
  139                 outb(MCA_ADAP_SETUP_REG, slot | MCA_ADAP_SET); 
  140                 pos5 = inb(MCA_POS_REG(MCA_POS5));
  141 
  142                 /* If Adapter Check is low */
  143                 if ((pos5 & MCA_POS5_CHCK) == 0) {
  144                         retval++;
  145 
  146                         /* If Adapter Check Status is available */
  147                         if ((pos5 & MCA_POS5_CHCK_STAT) == 0) {
  148                                 printf("MCA NMI: slot %d, POS6=0x%02x, POS7=0x%02x\n",
  149                                         slot+1,
  150                                         inb( MCA_POS_REG(MCA_POS6) ),
  151                                         inb( MCA_POS_REG(MCA_POS7) ));
  152                         } else { 
  153                                 printf("MCA NMI: slot %d\n", slot+1);
  154                         }
  155                 }
  156                 /* Disable adapter setup */
  157                 outb(MCA_ADAP_SETUP_REG, MCA_ADAP_SETUP_DIS);
  158         }
  159 
  160         return (retval);
  161 }

Cache object: 46bf7a5d7e41656f3eab88099d2823af


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