source: rtems/c/src/lib/libcpu/m68k/mcf5206/timer/timerisr.S @ 57e9580f

4.104.114.84.95
Last change on this file since 57e9580f was 57e9580f, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 4, 2003 at 6:53:02 PM

2003-09-04 Joel Sherrill <joel@…>

  • clock/ckinit.c, console/mcfuart.c, include/mcf5206e.h, include/mcfmbus.h, include/mcfuart.h, mbus/mcfmbus.c, timer/timer.c, timer/timerisr.S: URL for license changed.
  • 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:    Read_timer()
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 *
29 *  http://www.rtems.com/license/LICENSE.
30 *
31 *  $Id$
32 */
33
34#include "asm.h"
35#include "bsp.h"
36#include "mcf5206/mcf5206e.h"
37
38BEGIN_CODE
39        PUBLIC(timerisr)
40SYM(timerisr):
41        move.l   a0, a7@-
42        move.l   #MCF5206E_TER(BSP_MEM_ADDR_IMM, 2), a0
43        move.b   # (MCF5206E_TER_REF + MCF5206E_TER_CAP), (a0)
44        addq.l   #1,SYM(Timer_interrupts) | increment timer value
45        move.l   a7@+, a0
46        rte
47END_CODE
48END
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