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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, 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
|
