source: rtems/c/src/lib/libbsp/i386/pc386/timer/timerisr.s @ 7150f00f

/*-------------------------------------------------------------------------+
| timerisr.s v1.1 - PC386 BSP - 1997/08/07
+--------------------------------------------------------------------------+
| This file contains the PC386 timer interrupt handler.
+--------------------------------------------------------------------------+
| (C) Copyright 1997 -
| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
|
| http://pandora.ist.utl.pt
|
| Instituto Superior Tecnico * Lisboa * PORTUGAL
+--------------------------------------------------------------------------+
| Disclaimer:
|
| This file is provided "AS IS" without warranty of any kind, either
| expressed or implied.
+--------------------------------------------------------------------------+
| This code is base on:
|   timerisr.s,v 1.5 1995/12/19 20:07:45 joel Exp - go32 BSP
| With the following copyright notice:
| **************************************************************************
| * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.                      *
| * On-Line Applications Research Corporation (OAR).                       *
| * All rights assigned to U.S. Government, 1994.                          *
| *                                                                        *
| * This material may be reproduced by or for the U.S. Government pursuant *
| * to the copyright license under the clause at DFARS 252.227-7013.  This *
| * notice must appear in all copies of this file and its derivatives.     *
| **************************************************************************
+--------------------------------------------------------------------------*/


#include "asm.h"

BEGIN_CODE

        EXTERN(Ttimer_val)

/*-------------------------------------------------------------------------+
|         Function: rtems_isr timerisr(rtems_vector_number);
|      Description: ISR for the timer. The timer is set up to generate an
|                   interrupt at maximum intervals.
| Global Variables: None.
|        Arguments: standard - see RTEMS documentation.
|          Returns: standard return value - see RTEMS documentation. 
+--------------------------------------------------------------------------*/
        PUBLIC(timerisr)
SYM (timerisr): 
        incl    Ttimer_val      # another tick
        pushl   eax
        movb    $0x20, al
        outb    al, $0x20       # signal generic End Of Interrupt (EOI) to PIC
        popl    eax
        iret

END_CODE

END