g_func1.c

操作系统实验教程核心技术与编程实例书中地例子代码

svect()
  {
      segs.ds = FP_SEG(&gint8);
      tt = FP_OFF(&gint8);
      inregs.x.dx = tt;
      inregs.x.ax = 0x2508;
      intdosx(&inregs,&outregs,&segs);
  }
void save8(int n)
{
                                         /* get 8h vector */
        if (n==1) { inregs.x.ax = 0x3508; }
        else { inregs.x.ax = 0x3581; }
        intdosx(&inregs,&outregs,&segs);
        old_segment = segs.es;
        old_offset = outregs.x.bx;
                                /* save old_8h --> 81h */
        segs.ds = old_segment;
        inregs.x.dx = old_offset;
        if (n==1) { inregs.x.ax = 0x2581; }
        else { inregs.x.ax = 0x2508; }
        intdosx(&inregs,&outregs,&segs);
}
void ggret()
  {
    save8(0);
    setvect(INTERRUPT,oldhandler);
    printf("\n   Exit from genix--return");
    exit();
  }