source: rtems/c/src/lib/libbsp/m68k/mvme136/timer/timerisr.S @ df49c60

4.104.114.84.95
Last change on this file since df49c60 was 08311cc3, checked in by Joel Sherrill <joel.sherrill@…>, on 11/17/99 at 17:51:34

Updated copyright notice.

  • Property mode set to 100644
File size: 1023 bytes
Line 
1/*  timer_isr()
2 *
3 *  This routine provides the ISR for the Z8036 timer on the MVME136
4 *  board.   The timer is set up to generate an interrupt at maximum
5 *  intervals.
6 *
7 *  Input parameters:  NONE
8 *
9 *  Output parameters:  NONE
10 *
11 *  COPYRIGHT (c) 1989-1999.
12 *  On-Line Applications Research Corporation (OAR).
13 *
14 *  The license and distribution terms for this file may be
15 *  found in the file LICENSE in this distribution or at
16 *  http://www.OARcorp.com/rtems/license.html.
17 *
18 *  $Id$
19 */
20
21#include "asm.h"
22
23BEGIN_CODE
24
25.set CT1_CMD_STATUS,  0xfffb000a         | port A
26.set RELOAD,          0x24               | clr IP & IUS,allow countdown
27
28        PUBLIC (timerisr)
29SYM (timerisr):
30        movl    a0,a7@-                  | save a0
31        movl    #CT1_CMD_STATUS,a0       | a0 = addr of cmd status reg
32        movb    #RELOAD,a0@              | reload countdown
33        addql   #1, SYM (Ttimer_val)     | increment timer value
34        movl    a7@+,a0                  | save a0
35        rte
36
37END_CODE
38END
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