miscemu/interrupts.c

   1 /*
   2  * Interrupt vectors emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include "windows.h"
   8 #include "drive.h"
   9 #include "miscemu.h"
  10 #include "msdos.h"
  11 #include "module.h"
  12 #include "registers.h"
  13 #include "stackframe.h"
  14 #include "stddebug.h"
  15 #include "debug.h"
  16
  17 static SEGPTR INT_Vectors[256];
  18
  19   /* Ordinal number for interrupt 0 handler in WINPROCS.DLL */
  20 #define FIRST_INTERRUPT_ORDINAL 100
  21
  22
  23 /**********************************************************************
  24  *          INT_Init
  25  */
  26 BOOL INT_Init(void)
  27 {
  28     WORD vector;
  29     HMODULE hModule = GetModuleHandle( "WINPROCS" );
  30
  31     for (vector = 0; vector < 256; vector++)
  32     {
  33         if (!(INT_Vectors[vector] = MODULE_GetEntryPoint( hModule,
  34                                              FIRST_INTERRUPT_ORDINAL+vector )))
  35         {
  36             fprintf(stderr,"Internal error: no vector for int %02x\n",vector);
  37             return FALSE;
  38         }
  39     }
  40     return TRUE;
  41 }
  42
  43
  44 /**********************************************************************
  45  *          INT_GetHandler
  46  *
  47  * Return the interrupt vector for a given interrupt.
  48  */
  49 SEGPTR INT_GetHandler( BYTE intnum )
  50 {
  51     return INT_Vectors[intnum];
  52 }
  53
  54
  55 /**********************************************************************
  56  *          INT_SetHandler
  57  *
  58  * Set the interrupt handler for a given interrupt.
  59  */
  60 void INT_SetHandler( BYTE intnum, SEGPTR handler )
  61 {
  62     dprintf_int( stddeb, "Set interrupt vector %02x <- %04x:%04x\n",
  63                  intnum, HIWORD(handler), LOWORD(handler) );
  64     INT_Vectors[intnum] = handler;
  65 }
  66
  67
  68 /**********************************************************************
  69  *          INT_DummyHandler
  70  */
  71 void INT_DummyHandler( struct sigcontext_struct context )
  72 {
  73     INT_BARF( &context,
  74               CURRENT_STACK16->ordinal_number - FIRST_INTERRUPT_ORDINAL );
  75 }
  76
  77
  78 /**********************************************************************
  79  *          INT_Int11Handler
  80  *
  81  * Handler for int 11h (get equipment list).
  82  */
  83 void INT_Int11Handler( struct sigcontext_struct context )
  84 {
  85     int diskdrives = 0;
  86     int parallelports = 0;
  87     int serialports = 0;
  88     int x;
  89
  90 /* borrowed from Ralph Brown's interrupt lists
  91
  92                     bits 15-14: number of parallel devices
  93                     bit     13: [Conv] Internal modem
  94                     bit     12: reserved
  95                     bits 11- 9: number of serial devices
  96                     bit      8: reserved
  97                     bits  7- 6: number of diskette drives minus one
  98                     bits  5- 4: Initial video mode:
  99                                     00b = EGA,VGA,PGA
 100                                     01b = 40 x 25 color
 101                                     10b = 80 x 25 color
 102                                     11b = 80 x 25 mono
 103                     bit      3: reserved
 104                     bit      2: [PS] =1 if pointing device
 105                                 [non-PS] reserved
 106                     bit      1: =1 if math co-processor
 107                     bit      0: =1 if diskette available for boot
 108 */
 109 /*  Currently the only of these bits correctly set are:
 110                 bits 15-14              } Added by William Owen Smith,
 111                 bits 11-9               } wos@dcs.warwick.ac.uk
 112                 bits 7-6
 113                 bit  2                  (always set)
 114 */
 115
 116     if (DRIVE_IsValid(0)) diskdrives++;
 117     if (DRIVE_IsValid(1)) diskdrives++;
 118     if (diskdrives) diskdrives--;
 119
 120     for (x=0; x!=MAX_PORTS; x++)
 121     {
 122         if (COM[x].devicename)
 123             serialports++;
 124         if (LPT[x].devicename)
 125             parallelports++;
 126     }
 127     if (serialports > 7)                /* 3 bits -- maximum value = 7 */
 128         serialports=7;
 129     if (parallelports > 3)              /* 2 bits -- maximum value = 3 */
 130         parallelports=3;
 131
 132     AX_reg(&context) = (diskdrives << 6) | (serialports << 9) |
 133                        (parallelports << 14) | 0x02;
 134 }
 135
 136
 137 /**********************************************************************
 138  *          INT_Int12Handler
 139  *
 140  * Handler for int 12h (get memory size).
 141  */
 142 void INT_Int12Handler( struct sigcontext_struct context )
 143 {
 144     AX_reg(&context) = 640;
 145 }
 146
 147
 148 /**********************************************************************
 149  *          INT_Int15Handler
 150  *
 151  * Handler for int 15h.
 152  */
 153 void INT_Int15Handler( struct sigcontext_struct context )
 154 {
 155     INT_BARF( &context, 0x15 );
 156 }
 157
 158
 159 /**********************************************************************
 160  *          INT_Int16Handler
 161  *
 162  * Handler for int 16h (keyboard).
 163  */
 164 void INT_Int16Handler( struct sigcontext_struct context )
 165 {
 166     INT_BARF( &context, 0x16 );
 167 }