Subversion Repositories openrisc_me

/*

 * 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