source: rtems/cpukit/score/src/isr.c @ 3380ee8

/**
 *  @file
 *
 *  @brief Initialize the ISR handler
 *  @ingroup ScoreISR
 */

/*
 *  COPYRIGHT (c) 1989-2012.
 *  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.org/license/LICENSE.
 */

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

#include <rtems/score/isr.h>
#include <rtems/score/address.h>
#include <rtems/score/interr.h>
#include <rtems/score/percpu.h>
#include <rtems/score/stackimpl.h>
#include <rtems/score/wkspace.h>
#include <rtems/config.h>

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
  );

  _CPU_Initialize_vectors();
#endif

#if ( CPU_ALLOCATE_INTERRUPT_STACK == TRUE )
  {
    size_t stack_size = rtems_configuration_get_interrupt_stack_size();
    uint32_t cpu_max = rtems_configuration_get_maximum_processors();
    uint32_t cpu_index;

    if ( !_Stack_Is_enough( stack_size ) )
      _Terminate(
        INTERNAL_ERROR_CORE,
        true,
        INTERNAL_ERROR_INTERRUPT_STACK_TOO_SMALL
      );

    for ( cpu_index = 0 ; cpu_index < cpu_max; ++cpu_index ) {
      Per_CPU_Control *cpu = _Per_CPU_Get_by_index( cpu_index );
      void *low = _Workspace_Allocate_or_fatal_error( stack_size );
      void *high = _Addresses_Add_offset( low, stack_size );

#if (CPU_STACK_ALIGNMENT != 0)
      high = _Addresses_Align_down( high, CPU_STACK_ALIGNMENT );
#endif

      cpu->interrupt_stack_low = low;
      cpu->interrupt_stack_high = high;

      /*
       * Interrupt stack might have to be aligned and/or setup in a specific
       * way.  Do not use the local low or high variables here since
       * _CPU_Interrupt_stack_setup() is a nasty macro that might want to play
       * with the real memory locations.
       */
#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
}