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/*  timerisr.s

 *

 *  If required this ISR is used to bump a count of interval "overflow"

 *  interrupts which have occurred since the timer was started.  The

 *  number of overflows is taken into account in the Read_timer()

 *  routine if necessary.

 *

 *  To reduce overhead this is best to be the "rawest" hardware interupt

 *  handler you can write.  This should be the only interrupt which can

 *  occur during the measured time period.

 *

 *  NOTE:  This file is USUALLY in assembly and is LEAN AND MEAN.

 *         Any code in this isr is pure overhead which can perturb

 *         the accuracy of the Timing Test Suite.

 *

 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.

 *  On-Line Applications Research Corporation (OAR).

 *  All rights assigned to U.S. Government, 1994.

 *

 *  This material may be reproduced by or for the U.S. Government pursuant

 *  to the copyright license under the clause at DFARS 252.227-7013.  This

 *  notice must appear in all copies of this file and its derivatives.

 *

 *  $Id: timerisr.c,v 1.2 2001-09-27 12:01:20 chris Exp $

 */

#ifndef lint

static char _sccsid[] = "@(#)timerisr.c 03/15/96     1.1\n";

#endif

#include <rtems.h>

extern rtems_unsigned32 _Timer_interrupts;

void timerisr( void )

{

  /*

   *  _Timer_interrupts += TIMER_BETWEEN_OVERFLOWS  (usually in microseconds)

   *  return from interrupt

   */

}