d_setvec.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 87 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
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*  ========================================================================
*
* Description:  Set DOS interrupt vector.
*
****************************************************************************/


#include "variety.h"
#include <stddef.h>
#include <dos.h>


#if defined(__386__)
  #if defined(__WINDOWS_386__)
    #include "tinyio.h"
  #else
    #include "extender.h"
    extern  void pharlap_setvect( unsigned, void (__interrupt _WCFAR *)());
    #pragma aux  pharlap_setvect = \
        "push ds"           \
        "mov ds,ecx"        \
        "mov cl,al"         \
        "mov al,04"         \
        "mov ah,25h"        \
        "int 21h"           \
        "pop ds"            \
        parm caller [al] [cx edx];

    extern  void dos4g_setvect( unsigned, void (__interrupt _WCFAR *)());
    #pragma aux  dos4g_setvect = \
        "push ds"           \
        "mov ds,ecx"        \
        "mov ah,25h"        \
        "int 21h"           \
        "pop ds"            \
        parm caller [al] [cx edx];
    #endif
#else
    extern  void _setvect( unsigned, void (__interrupt _WCFAR *)());
    #pragma aux  _setvect = \
        "push ds"           \
        "mov ds,cx"         \
        "mov ah,25h"        \
        "int 21h"           \
        "pop ds"            \
        parm caller [ax] [cx dx];
#endif

_WCRTLINK void _dos_setvect( int intnum, void (__interrupt _WCFAR *func)() )
{
#if defined(__WINDOWS_386__)
    TinySetVect( intnum, (void _WCNEAR *) func );
#elif defined(__386__)
    if( _IsPharLap() ) {
        pharlap_setvect( intnum, func );
    } else {        /* DOS/4G style */
        dos4g_setvect( intnum, func );
    }
#else
    _setvect( intnum, func );
#endif
}