source: rtems/cpukit/libcsupport/src/malloc_initialize.c @ f7c5f94

/**
 * @file
 *
 * @brief RTEMS_Malloc_Initialize() implementation.
 */

/*
 *  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/malloc.h>
#include <rtems/score/wkspace.h>
#include <rtems/sysinit.h>

#include "malloc_p.h"

Heap_Control *RTEMS_Malloc_Heap;

static void _Malloc_Initialize( void )
{
  RTEMS_Malloc_Initialize( _Memory_Get(), _Heap_Extend );
}

RTEMS_SYSINIT_ITEM(
  _Malloc_Initialize,
  RTEMS_SYSINIT_MALLOC,
  RTEMS_SYSINIT_ORDER_MIDDLE
);

#ifdef RTEMS_NEWLIB
static Heap_Control _Malloc_Heap;

void RTEMS_Malloc_Initialize(
  const Memory_Information              *mem,
  Heap_Initialization_or_extend_handler  extend
)
{
  if ( rtems_configuration_get_unified_work_area() ) {
    RTEMS_Malloc_Heap = &_Workspace_Area;
  } else {
    Heap_Control                          *heap;
    Heap_Initialization_or_extend_handler  init_or_extend;
    uintptr_t                              page_size;
    size_t                                 i;

    heap = &_Malloc_Heap;
    RTEMS_Malloc_Heap = heap;
    init_or_extend = _Heap_Initialize;
    page_size = CPU_HEAP_ALIGNMENT;

    for (i = 0; i < _Memory_Get_count( mem ); ++i) {
      Memory_Area *area;
      uintptr_t    space_available;

      area = _Memory_Get_area( mem, i );
      space_available = ( *init_or_extend )(
        heap,
        _Memory_Get_free_begin( area ),
        _Memory_Get_free_size( area ),
        page_size
      );

      if ( space_available > 0 ) {
        _Memory_Consume( area, _Memory_Get_free_size( area ) );
        init_or_extend = extend;
      }
    }

    if ( init_or_extend == _Heap_Initialize ) {
      _Internal_error( INTERNAL_ERROR_NO_MEMORY_FOR_HEAP );
    }
  }
}
#else
void RTEMS_Malloc_Initialize(
  const Memory_Information              *mem,
  Heap_Initialization_or_extend_handler  extend
)
{
  /* FIXME: Dummy function */
}
#endif