realvec.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 85 行

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//
// REALVEC      : real-mode vector handling for Phar Lap
//

#include <dos.h>

extern unsigned long _getrealvect(char);
#pragma aux _getrealvect = \
                "mov    ax,2503h" \
                "int    21h" \
                parm [cl] \
                value [ebx] \
                modify exact [ax ebx]

extern void _setrealvect(char,unsigned long);
#pragma aux _setrealvect = \
                "mov    ax,2505h" \
                "int    21h" \
                parm [cl] [ebx] \
                modify exact [ax]

extern void _setvectp(unsigned short,void (interrupt far *)(void));
#pragma aux _setvectp = \
                "push   ds" \
                "mov    ds,cx" \
                "mov    cl,al" \
                "mov    ax,2506h" \
                "int    21h" \
                "pop    ds" \
                parm [al] [cx edx] \
                modify exact [ax cl]


unsigned long   _dos_getrealvect( int intnum ) {
//==============================================

    return( _getrealvect( intnum ) );
}


void    _dos_setrealvect( int intnum, unsigned long func ) {
//==========================================================

    _setrealvect( intnum, func );
}


void    _dos_setvectp( int intnum, void (interrupt far *func)(void) ) {
//=================================================================

    _setvectp( intnum, func );
}