/**
* @file
*
* @brief Malloc initialization implementation.
*/
/*
* COPYRIGHT (c) 1989-2007.
* 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.h>
#include <rtems/malloc.h>
#include <rtems/score/wkspace.h>
#include "malloc_p.h"
/* FIXME: Dummy function */
#ifndef RTEMS_NEWLIB
void RTEMS_Malloc_Initialize(
void *heap_begin,
uintptr_t heap_size,
size_t sbrk_amount
)
{
}
#else
rtems_malloc_statistics_t rtems_malloc_statistics;
extern bool rtems_unified_work_area;
void RTEMS_Malloc_Initialize(
void *heap_begin,
uintptr_t heap_size,
size_t sbrk_amount
)
{
#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
/*
* If configured, initialize the boundary support
*/
if ( rtems_malloc_boundary_helpers != NULL ) {
(*rtems_malloc_boundary_helpers->initialize)();
}
#endif
/*
* If configured, initialize the statistics support
*/
if ( rtems_malloc_statistics_helpers != NULL ) {
(*rtems_malloc_statistics_helpers->initialize)();
}
/*
* Initialize the garbage collection list to start with nothing on it.
*/
malloc_deferred_frees_initialize();
/*
* Initialize the optional sbrk support for extending the heap
*/
if ( rtems_malloc_sbrk_helpers != NULL ) {
void *new_heap_begin = (*rtems_malloc_sbrk_helpers->initialize)(
heap_begin,
sbrk_amount
);
heap_size -= (uintptr_t) new_heap_begin - (uintptr_t) heap_begin;
heap_begin = new_heap_begin;
}
/*
* If this system is configured to use the same heap for
* the RTEMS Workspace and C Program Heap, then we need to
* be very very careful about destroying the initialization
* that has already been done.
*/
/*
* If the BSP is not clearing out the workspace, then it is most likely
* not clearing out the initial memory for the heap. There is no
* standard supporting zeroing out the heap memory. But much code
* with UNIX history seems to assume that memory malloc'ed during
* initialization (before any free's) is zero'ed. This is true most
* of the time under UNIX because zero'ing memory when it is first
* given to a process eliminates the chance of a process seeing data
* left over from another process. This would be a security violation.
*/
if (
!rtems_unified_work_area
&& rtems_configuration_get_do_zero_of_workspace()
) {
memset( heap_begin, 0, heap_size );
}
/*
* Unfortunately we cannot use assert if this fails because if this
* has failed we do not have a heap and if we do not have a heap
* STDIO cannot work because there will be no buffers.
*/
if ( !rtems_unified_work_area ) {
uintptr_t status = _Protected_heap_Initialize(
RTEMS_Malloc_Heap,
heap_begin,
heap_size,
CPU_HEAP_ALIGNMENT
);
if ( status == 0 ) {
rtems_fatal_error_occurred( RTEMS_NO_MEMORY );
}
}
MSBUMP( space_available, _Protected_heap_Get_size(RTEMS_Malloc_Heap) );
#if defined(RTEMS_HEAP_DEBUG)
if ( _Protected_heap_Walk( RTEMS_Malloc_Heap, 0, false ) ) {
printk( "Malloc heap not initialized correctly\n" );
rtems_print_buffer( heap_begin, 32 );
printk( "\n" );
rtems_print_buffer( (heap_begin + heap_size) - 48, 48 );
rtems_fatal_error_occurred( RTEMS_NO_MEMORY );
}
#endif
}
#endif
