source: rtems/cpukit/score/src/isr.c @ 6830941

/*
 *  ISR Handler
 *
 *
 *  COPYRIGHT (c) 1989-2008.
 *  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.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/stack.h>
#include <rtems/score/interr.h>
#include <rtems/score/wkspace.h>
#include <rtems/config.h>

/*  _ISR_Handler_initialization
 *
 *  This routine initializes the ISR handler.
 *
 *  Input parameters: NONE
 *
 *  Output parameters: NONE
 */

void _ISR_Handler_initialization( void )
{
  _ISR_Nest_level = 0;

#if (CPU_SIMPLE_VECTORED_INTERRUPTS == TRUE)
  _ISR_Vector_table = _Workspace_Allocate_or_fatal_error(
     sizeof(ISR_Handler_entry) * ISR_NUMBER_OF_VECTORS
  );
#endif

  _CPU_Initialize_vectors();

#if ( CPU_ALLOCATE_INTERRUPT_STACK == TRUE )

  if ( !_Stack_Is_enough(Configuration.interrupt_stack_size) )
    _Internal_error_Occurred(
      INTERNAL_ERROR_CORE,
      true,
      INTERNAL_ERROR_INTERRUPT_STACK_TOO_SMALL
    );

  _CPU_Interrupt_stack_low = _Workspace_Allocate_or_fatal_error(
    Configuration.interrupt_stack_size
  );

  _CPU_Interrupt_stack_high = _Addresses_Add_offset(
    _CPU_Interrupt_stack_low,
    Configuration.interrupt_stack_size
  );

  _CPU_Interrupt_stack_high = (void *)
    ((uintptr_t) _CPU_Interrupt_stack_high & ~(CPU_STACK_ALIGNMENT - 1));

  /* Interrupt stack might have to be aligned and/or setup
   * in a specific way.
   */
#if defined(_CPU_Interrupt_stack_setup)
  _CPU_Interrupt_stack_setup(_CPU_Interrupt_stack_low, _CPU_Interrupt_stack_high);
#endif

#endif

#if ( CPU_HAS_HARDWARE_INTERRUPT_STACK == TRUE )
  _CPU_Install_interrupt_stack();
#endif

}