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/**
* @file
*
* @brief Workspace Handler Support
* @ingroup RTEMSScoreWorkspace
*/
/*
* COPYRIGHT (c) 1989-2009.
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/wkspace.h>
#include <rtems/score/assert.h>
#include <rtems/score/heapimpl.h>
#include <rtems/score/interr.h>
#include <rtems/config.h>
#include <rtems/sysinit.h>
Heap_Control _Workspace_Area;
static void _Workspace_Initialize( void )
{
_Workspace_Handler_initialization( _Memory_Get(), _Heap_Extend );
}
RTEMS_SYSINIT_ITEM(
_Workspace_Initialize,
RTEMS_SYSINIT_WORKSPACE,
RTEMS_SYSINIT_ORDER_MIDDLE
);
void _Workspace_Handler_initialization(
const Memory_Information *mem,
Heap_Initialization_or_extend_handler extend
)
{
Heap_Initialization_or_extend_handler init_or_extend;
uintptr_t remaining;
bool unified;
uintptr_t page_size;
uintptr_t overhead;
size_t i;
page_size = CPU_HEAP_ALIGNMENT;
remaining = rtems_configuration_get_work_space_size();
init_or_extend = _Heap_Initialize;
unified = rtems_configuration_get_unified_work_area();
overhead = _Heap_Area_overhead( page_size );
for ( i = 0; i < _Memory_Get_count( mem ); ++i ) {
Memory_Area *area;
uintptr_t free_size;
area = _Memory_Get_area( mem, i );
free_size = _Memory_Get_free_size( area );
if ( free_size > overhead ) {
uintptr_t space_available;
uintptr_t size;
if ( unified ) {
size = free_size;
} else {
if ( remaining > 0 ) {
size = remaining < free_size - overhead ?
remaining + overhead : free_size;
} else {
size = 0;
}
}
space_available = ( *init_or_extend )(
&_Workspace_Area,
_Memory_Get_free_begin( area ),
size,
page_size
);
_Memory_Consume( area, size );
if ( space_available < remaining ) {
remaining -= space_available;
} else {
remaining = 0;
}
init_or_extend = extend;
}
}
if ( remaining > 0 ) {
_Internal_error( INTERNAL_ERROR_TOO_LITTLE_WORKSPACE );
}
_Heap_Protection_set_delayed_free_fraction( &_Workspace_Area, 1 );
}
void *_Workspace_Allocate( size_t size )
{
return _Heap_Allocate( &_Workspace_Area, size );
}
void _Workspace_Free( void *block )
{
_Heap_Free( &_Workspace_Area, block );
}
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