/*  timer_isr()
 *
 *  This routine provides the ISR for the timer.   The timer is set up 
 *  to generate an interrupt at maximum intervals.
 *
 *  Input parameters:  NONE
 *
 *  Output parameters:  NONE
 *
 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
 *  On-Line Applications Research Corporation (OAR).
 *  All rights assigned to U.S. Government, 1994.
 *
 *  This material may be reproduced by or for the U.S. Government pursuant
 *  to the copyright license under the clause at DFARS 252.227-7013.  This
 *  notice must appear in all copies of this file and its derivatives.
 *
 *  $Id$
 */

#include "asm.h"

        BEGIN_CODE

        EXTERN(_Ttimer_val)

        PUBLIC(timerisr)

SYM (timerisr): 
        addl    $1,_Ttimer_val   # another tick
        push    edx
        push    eax
        movw    $0x20,dx
        mov     edx,eax
        outb    al,(dx) # touch interrupt controller
        pop     eax
        pop     edx
        iret

END_CODE
END