msdos/interrupts.c

   1 /*
   2  * Interrupt vectors emulation
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <sys/types.h>
  22 #include "windef.h"
  23 #include "wine/winbase16.h"
  24 #include "miscemu.h"
  25 #include "msdos.h"
  26 #include "module.h"
  27 #include "wine/debug.h"
  28
  29 WINE_DEFAULT_DEBUG_CHANNEL(int);
  30
  31 static FARPROC16 INT_Vectors[256];
  32 static FARPROC48 INT_Vectors48[256];
  33
  34 /* Ordinal number for interrupt 0 handler in WPROCS.DLL */
  35 #define FIRST_INTERRUPT 100
  36
  37
  38 /**********************************************************************
  39  *          INT_GetPMHandler
  40  *
  41  * Return the protected mode interrupt vector for a given interrupt.
  42  */
  43 FARPROC16 INT_GetPMHandler( BYTE intnum )
  44 {
  45     if (!INT_Vectors[intnum])
  46     {
  47         static HMODULE16 wprocs;
  48         if (!wprocs)
  49         {
  50             if (((wprocs = GetModuleHandle16( "wprocs" )) < 32) &&
  51                 ((wprocs = LoadLibrary16( "wprocs" )) < 32))
  52             {
  53                 ERR("could not load wprocs.dll\n");
  54                 return 0;
  55             }
  56         }
  57         if (!(INT_Vectors[intnum] = GetProcAddress16( wprocs, (LPCSTR)(FIRST_INTERRUPT + intnum))))
  58         {
  59             WARN("int%x not implemented, returning dummy handler\n", intnum );
  60             INT_Vectors[intnum] = GetProcAddress16( wprocs, (LPCSTR)(FIRST_INTERRUPT + 256) );
  61         }
  62     }
  63     return INT_Vectors[intnum];
  64 }
  65
  66
  67 /**********************************************************************
  68  *          INT_SetPMHandler
  69  *
  70  * Set the protected mode interrupt handler for a given interrupt.
  71  */
  72 void INT_SetPMHandler( BYTE intnum, FARPROC16 handler )
  73 {
  74     TRACE("Set protected mode interrupt vector %02x <- %04x:%04x\n",
  75                  intnum, HIWORD(handler), LOWORD(handler) );
  76     INT_Vectors[intnum] = handler;
  77 }
  78
  79
  80 /**********************************************************************
  81  *         INT_GetPMHandler48
  82  *
  83  * Return the protected mode interrupt vector for a given interrupt.
  84  * Used to get 48-bit pointer for 32-bit interrupt handlers in DPMI32.
  85  */
  86 FARPROC48 INT_GetPMHandler48( BYTE intnum )
  87 {
  88     if (!INT_Vectors48[intnum].selector)
  89     {
  90         INT_Vectors48[intnum].selector = DOSMEM_dpmi_segments.int48_sel;
  91         INT_Vectors48[intnum].offset = 4 * intnum;
  92     }
  93     return INT_Vectors48[intnum];
  94 }
  95
  96
  97 /**********************************************************************
  98  *         INT_SetPMHandler48
  99  *
 100  * Set the protected mode interrupt handler for a given interrupt.
 101  * Used to set 48-bit pointer for 32-bit interrupt handlers in DPMI32.
 102  */
 103 void INT_SetPMHandler48( BYTE intnum, FARPROC48 handler )
 104 {
 105     TRACE("Set 32-bit protected mode interrupt vector %02x <- %04x:%08x\n",
 106           intnum, handler.selector, handler.offset );
 107     INT_Vectors48[intnum] = handler;
 108 }
 109
 110
 111 /**********************************************************************
 112  *         INT_DefaultHandler (WPROCS.356)
 113  *
 114  * Default interrupt handler.
 115  */
 116 void WINAPI INT_DefaultHandler( CONTEXT86 *context )
 117 {
 118 }