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/*-------------------------------------------------------------------------+
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| timerisr.s v1.1 - PC386 BSP - 1997/08/07
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+--------------------------------------------------------------------------+
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| This file contains the PC386 timer interrupt handler.
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+--------------------------------------------------------------------------+
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| (C) Copyright 1997 -
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| - NavIST Group - Real-Time Distributed Systems and Industrial Automation
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| http://pandora.ist.utl.pt
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| Instituto Superior Tecnico * Lisboa * PORTUGAL
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+--------------------------------------------------------------------------+
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| Disclaimer:
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| This file is provided "AS IS" without warranty of any kind, either
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| expressed or implied.
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+--------------------------------------------------------------------------+
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| This code is base on:
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| timerisr.s,v 1.5 1995/12/19 20:07:45 joel Exp - go32 BSP
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| With the following copyright notice:
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| **************************************************************************
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| * COPYRIGHT (c) 1989-1999.
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| * On-Line Applications Research Corporation (OAR).
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| *
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| * The license and distribution terms for this file may be
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| * found in found in the file LICENSE in this distribution or at
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| * http://www.OARcorp.com/rtems/license.html.
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| **************************************************************************
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| $Id: timerisr.S,v 1.2 2001-09-27 11:59:48 chris Exp $
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+--------------------------------------------------------------------------*/
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#include "asm.h"
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BEGIN_CODE
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EXTERN(Ttimer_val)
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/*-------------------------------------------------------------------------+
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| Function: rtems_isr timerisr(rtems_vector_number);
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| Description: ISR for the timer. The timer is set up to generate an
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| interrupt at maximum intervals.
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| Global Variables: None.
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| Arguments: standard - see RTEMS documentation.
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| Returns: standard return value - see RTEMS documentation.
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+--------------------------------------------------------------------------*/
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PUBLIC(timerisr)
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SYM (timerisr):
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incl Ttimer_val # another tick
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pushl eax
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movb $0x20, al
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outb al, $0x20 # signal generic End Of Interrupt (EOI) to PIC
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popl eax
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iret
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END_CODE
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END
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