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/*-------------------------------------------------------------------------+
| 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) 1989-1999.
| * On-Line Applications Research Corporation (OAR).
| *
| * The license and distribution terms for this file may be
| * found in found in the file LICENSE in this distribution or at
| * http://www.rtems.com/license/LICENSE.
| **************************************************************************
|
| $Id$
+--------------------------------------------------------------------------*/
#include <rtems/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
|
