blob: c804b9dfa61b5707947343ab5fd4c46e7cc903d2 (
plain) (
tree)
|
|
/*
* 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.
*
* $Id$
*/
#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
|