source: rtems/c/src/lib/libcpu/a29k/timer/timerisr.c @ 948a069

Last change on this file since 948a069 was 948a069, checked in by Joel Sherrill <joel.sherrill@…>, on Sep 4, 2003 at 5:32:05 PM

2003-09-04 Joel Sherrill <joel@…>

  • clock/ckinit.c, timer/timer.c, timer/timerisr.c: Removed incorrect statement about copyright assignment.
  • Property mode set to 100644
File size: 1.0 KB
Line 
1/*  timerisr.s
2 *
3 *  If required this ISR is used to bump a count of interval "overflow"
4 *  interrupts which have occurred since the timer was started.  The
5 *  number of overflows is taken into account in the Read_timer()
6 *  routine if necessary.
7 *
8 *  To reduce overhead this is best to be the "rawest" hardware interupt
9 *  handler you can write.  This should be the only interrupt which can
10 *  occur during the measured time period.
11 *
12 *  NOTE:  This file is USUALLY in assembly and is LEAN AND MEAN.
13 *         Any code in this isr is pure overhead which can perturb
14 *         the accuracy of the Timing Test Suite.
15 *
16 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
17 *  On-Line Applications Research Corporation (OAR).
18 *
19 *  $Id$
20 */
21
22#ifndef lint
23static char _sccsid[] = "@(#)timerisr.c 03/15/96     1.1\n";
24#endif
25
26#include <rtems.h>
27
28extern rtems_unsigned32 _Timer_interrupts;
29
30void timerisr( void )
31{
32  /*
33   *  _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS  (usually in microseconds)
34   *  return from interrupt
35   */
36}
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