source: rtems/c/src/lib/libcpu/m68k/mcf5206/timer/timerisr.S @ c499856

4.11
Last change on this file since c499856 was c499856, checked in by Chris Johns <chrisj@…>, on Mar 20, 2014 at 9:10:47 PM

Change all references of rtems.com to rtems.org.

  • Property mode set to 100644
File size: 1.2 KB
Line 
1/*
2 *  Handle MCF5206 TIMER2 interrupts.
3 *
4 * All code in this routine is pure overhead which can perturb the
5 * accuracy of RTEMS' timing test suite.
6 *
7 * See also:    benchmark_timer_read()
8 *
9 * To reduce overhead this is best to be the "rawest" hardware interupt
10 * handler you can write.  This should be the only interrupt which can
11 * occur during the measured time period.
12 *
13 * An external counter, Timer_interrupts, is incremented.
14 *
15 *  Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russia
16 *  Author: Victor V. Vengerov <vvv@oktet.ru>
17 *
18 *  This file based on work:
19 *  Author:
20 *    David Fiddes, D.J@fiddes.surfaid.org
21 *    http://www.calm.hw.ac.uk/davidf/coldfire/
22 *
23 *  COPYRIGHT (c) 1989-1998.
24 *  On-Line Applications Research Corporation (OAR).
25 *
26 *  The license and distribution terms for this file may be
27 *  found in the file LICENSE in this distribution or at
28 *  http://www.rtems.org/license/LICENSE.
29 */
30
31#include <rtems/asm.h>
32#include "bsp.h"
33#include "mcf5206/mcf5206e.h"
34
35BEGIN_CODE
36        PUBLIC(timerisr)
37SYM(timerisr):
38        move.l   a0, a7@-
39        move.l   #MCF5206E_TER(BSP_MEM_ADDR_IMM, 2), a0
40        move.b   # (MCF5206E_TER_REF + MCF5206E_TER_CAP), (a0)
41        addq.l   #1,SYM(Timer_interrupts) | increment timer value
42        move.l   a7@+, a0
43        rte
44END_CODE
45END
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