forked from Imagelibrary/rtems
bd5984deb7
* libcsupport/src/free.c, libcsupport/src/malloc.c, libcsupport/src/malloc_initialize.c, libcsupport/src/malloc_p.h, libcsupport/src/malloc_sbrk_helpers.c, libcsupport/src/malloc_statistics_helpers.c, libcsupport/src/malloc_walk.c, libcsupport/src/mallocfreespace.c, libcsupport/src/mallocinfo.c, libcsupport/src/realloc.c, libcsupport/src/rtems_memalign.c, sapi/include/confdefs.h, score/inline/rtems/score/thread.inl: Add support for optionally having a unified work area. In other words, the RTEMS Workspace and C Program Heap are the same pool of memory.
118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* RTEMS Malloc Family Implementation --Initialization
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*
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*
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* COPYRIGHT (c) 1989-2007.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems.h>
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#include <rtems/malloc.h>
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#include <rtems/score/wkspace.h>
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#include "malloc_p.h"
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rtems_malloc_statistics_t rtems_malloc_statistics;
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extern bool rtems_unified_work_area;
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void RTEMS_Malloc_Initialize(
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void *start,
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size_t length,
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size_t sbrk_amount
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)
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{
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uint32_t status;
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void *starting_address;
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#if defined(RTEMS_MALLOC_BOUNDARY_HELPERS)
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/*
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* If configured, initialize the boundary support
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*/
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if (rtems_malloc_boundary_helpers)
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(*rtems_malloc_boundary_helpers->initialize)();
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#endif
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/*
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* If configured, initialize the statistics support
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*/
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if ( rtems_malloc_statistics_helpers )
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(*rtems_malloc_statistics_helpers->initialize)();
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/*
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* Initialize the garbage collection list to start with nothing on it.
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*/
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malloc_deferred_frees_initialize();
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starting_address = start;
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/*
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* Initialize the optional sbrk support for extending the heap
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*/
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if (rtems_malloc_sbrk_helpers) {
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starting_address = (*rtems_malloc_sbrk_helpers->initialize)(
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start,
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sbrk_amount
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);
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}
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/*
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* If this system is configured to use the same heap for
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* the RTEMS Workspace and C Program Heap, then we need to
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* be very very careful about destroying the initialization
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* that has already been done.
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*/
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/*
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* If the BSP is not clearing out the workspace, then it is most likely
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* not clearing out the initial memory for the heap. There is no
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* standard supporting zeroing out the heap memory. But much code
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* with UNIX history seems to assume that memory malloc'ed during
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* initialization (before any free's) is zero'ed. This is true most
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* of the time under UNIX because zero'ing memory when it is first
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* given to a process eliminates the chance of a process seeing data
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* left over from another process. This would be a security violation.
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*/
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if ( !rtems_unified_work_area &&
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rtems_configuration_get_do_zero_of_workspace() )
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memset( starting_address, 0, length );
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/*
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* Unfortunately we cannot use assert if this fails because if this
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* has failed we do not have a heap and if we do not have a heap
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* STDIO cannot work because there will be no buffers.
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*/
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if ( !rtems_unified_work_area ) {
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status = _Protected_heap_Initialize(
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RTEMS_Malloc_Heap,
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starting_address,
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length,
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CPU_HEAP_ALIGNMENT
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);
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if ( !status )
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rtems_fatal_error_occurred( status );
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}
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#if defined(RTEMS_HEAP_DEBUG)
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if ( _Protected_heap_Walk( RTEMS_Malloc_Heap, 0, false ) ) {
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printk( "Malloc heap not initialized correctly\n" );
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rtems_print_buffer( start, 32 );
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printk( "\n" );
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rtems_print_buffer( (start + length) - 48, 48 );
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rtems_fatal_error_occurred( RTEMS_NO_MEMORY );
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}
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#endif
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MSBUMP(space_available, length);
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}
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