source: rtems/c/src/lib/libbsp/i386/go32/timer/timerisr.s @ 98e4ebf

4.104.114.84.95
Last change on this file since 98e4ebf was 98e4ebf, checked in by Joel Sherrill <joel.sherrill@…>, on Oct 8, 1997 at 3:45:54 PM

Fixed typo in the pointer to the license terms.

  • Property mode set to 100644
File size: 890 bytes
Line 
1/*  timer_isr()
2 *
3 *  This routine provides the ISR for the timer.   The timer is set up
4 *  to generate an interrupt at maximum intervals.
5 *
6 *  Input parameters:  NONE
7 *
8 *  Output parameters:  NONE
9 *
10 *  COPYRIGHT (c) 1989-1997.
11 *  On-Line Applications Research Corporation (OAR).
12 *  Copyright assigned to U.S. Government, 1994.
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
23        BEGIN_CODE
24
25        EXTERN(_Ttimer_val)
26
27        PUBLIC(timerisr)
28
29SYM (timerisr): 
30        addl    $1,_Ttimer_val   # another tick
31        push    edx
32        push    eax
33        movw    $0x20,dx
34        mov     edx,eax
35        outb    al,(dx) # touch interrupt controller
36        pop     eax
37        pop     edx
38        iret
39
40END_CODE
41END
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