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/*  timer_isr()

 *

 *  This routine provides the ISR for the Z8036 timer on the MVME136

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

 *  intervals.

 *

 *  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.

 *

 *  Modifications of respective RTEMS file: COPYRIGHT (c) 1994.

 *  EISCAT Scientific Association. M.Savitski

 *

 *  This material is a part of the MVME162 Board Support Package

 *  for the RTEMS executive. Its licensing policies are those of the

 *  RTEMS above.

 *

 *  $Id: timerisr.S,v 1.2 2001-09-27 12:00:18 chris Exp $

 */

#include "asm.h"

BEGIN_CODE

.set INTR_CLEAR_REG,      0xfff40074      | interrupt clear register

.set RELOAD,              0x01000000      | clear tick 1 interrupt

        PUBLIC (Ttimer_val)

        PUBLIC (timerisr)

SYM (timerisr):

        move.l  a0, -(a7)                 | save a0

        movea.l #INTR_CLEAR_REG, a0       | a0 = addr of cmd status reg

        ori.l   #RELOAD, (a0)             | reload countdown

        addq.l  #1, SYM (Ttimer_val)      | increment timer value

        move.l  (a7)+, a0                 | restore a0

        rte

END_CODE

END