source: rtems/c/src/lib/libbsp/m68k/gen68302/timer/timerisr.s @ 9700578

4.104.114.84.95
Last change on this file since 9700578 was 9e86dd7d, checked in by Joel Sherrill <joel.sherrill@…>, on 06/07/95 at 01:27:28

incorporated mc68302 support
  • Property mode set to 100644
File size: 710 bytes
Line 
1/*
2 * Handle 68302 TIMER2 interrupts.
3 *
4 * All code in this routine is pure overhead which can perturb the
5 * accuracy of RTEMS' timing test suite.
6 *
7 * See also:    Read_timer()
8 *
9 * To reduce overhead this is best to be the "rawest" hardware interupt
10 * handler you can write.  This should be the only interrupt which can
11 * occur during the measured time period.
12 *
13 * An external counter, Timer_interrupts, is incremented.
14 *
15 *  $Id$
16 */
17
18#include "asm.h"
19
20BEGIN_CODE
21        PUBLIC(timerisr)
22SYM(timerisr):
23        move.w  #0x0040,SYM(m302)+2072  | clear interrupt in-service bit
24        move.b  #3,SYM(m302)+2137       | clear timer interrupt event register
25        addq.l  #1,SYM(Timer_interrupts) | increment timer value
26        rte
27END_CODE
28END
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