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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) 1989-1998.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* 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.
*
* $Id$
*/
#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
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