Subversion Repositories openrisc_2011-10-31

/*
 * Handle 68302 TIMER2 interrupts.
 *
 * All code in this routine is pure overhead which can perturb the
 * accuracy of RTEMS' timing test suite.
 *
 * See also:    Read_timer()
 *
 * 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.
 *
 * An external counter, Timer_interrupts, is incremented.
 *
 *  $Id: timerisr.S,v 1.2 2001-09-27 12:00:23 chris Exp $
 */

#include "asm.h"

BEGIN_CODE
        PUBLIC(timerisr)
SYM(timerisr):
        move.w  #0x0040,SYM(m302)+2072  | clear interrupt in-service bit
        move.b  #3,SYM(m302)+2137       | clear timer interrupt event register
        addq.l  #1,SYM(Timer_interrupts) | increment timer value
        rte
END_CODE
END