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/*

 *  ISR Handler

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  $Id: isr.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/isr.h>

#include <rtems/score/stack.h>

#include <rtems/score/interr.h>

#include <rtems/score/wkspace.h>

/*  _ISR_Handler_initialization

 *

 *  This routine initializes the ISR handler.

 *

 *  Input parameters: NONE

 *

 *  Output parameters: NONE

 */

void _ISR_Handler_initialization( void )

{

  _ISR_Signals_to_thread_executing = FALSE;

  _ISR_Nest_level = 0;

#if ( CPU_ALLOCATE_INTERRUPT_STACK == TRUE )

  if ( _CPU_Table.interrupt_stack_size < STACK_MINIMUM_SIZE )

    _Internal_error_Occurred(

      INTERNAL_ERROR_CORE,

      TRUE,

      INTERNAL_ERROR_INTERRUPT_STACK_TOO_SMALL

    );

  _CPU_Interrupt_stack_low =

    _Workspace_Allocate_or_fatal_error( _CPU_Table.interrupt_stack_size );

  _CPU_Interrupt_stack_high = _Addresses_Add_offset(

    _CPU_Interrupt_stack_low,

    _CPU_Table.interrupt_stack_size

  );

#endif

#if ( CPU_HAS_HARDWARE_INTERRUPT_STACK == TRUE )

  _CPU_Install_interrupt_stack();

#endif

}