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/*  timer_isr()

 *

 *  This routine provides the ISR for the MC68230 timer on the Motorola

 *  IDP board.   The timer is set up to generate an interrupt at maximum

 *  intervals.

 *

 *  Code modified by Doug McBride, Colorado Space Grant College

 *  countdown should be loaded automatically

 *

 *  Input parameters:  NONE

 *

 *  Output parameters:  NONE

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: timerisr.S,v 1.2 2001-09-27 12:00:12 chris Exp $

 */

#include "asm.h"

BEGIN_CODE

.set TSR,        0x00c0106B              | base address of PIT register "TSR"

        PUBLIC (timerisr)

SYM (timerisr):

        movb    #1,TSR                                         | acknowledge interrupt

        addql   #1, SYM (Ttimer_val)   | increment timer value

        rte

END_CODE

END