/* SPDX-License-Identifier: BSD-2-Clause */
/**
* @file
*
* @ingroup RTEMSScoreWorkspace
*
* @brief This header file provides the implementation of
* _Workspace_Initialize_for_one_area().
*/
/*
* Copyright (C) 2012, 2020 embedded brains GmbH (http://www.embedded-brains.de)
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RTEMS_SCORE_WKSPACEINITONE_H
#define _RTEMS_SCORE_WKSPACEINITONE_H
#include <rtems/score/wkspace.h>
#include <rtems/score/assert.h>
#include <rtems/score/heapimpl.h>
#include <rtems/score/interr.h>
#include <rtems/score/memory.h>
#include <rtems/config.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @ingroup RTEMSScoreWorkspace
*
* @brief Initializes the RTEMS Workspace with support for exactly one memory
* area.
*
* This implementation should be used by BSPs which provide exactly one memory
* area via _Memory_Get() to implement _Workspace_Handler_initialization().
*/
RTEMS_INLINE_ROUTINE void _Workspace_Initialize_for_one_area( void )
{
uintptr_t page_size;
uintptr_t wkspace_size;
uintptr_t wkspace_size_with_overhead;
const Memory_Information *mem;
Memory_Area *area;
uintptr_t free_size;
uintptr_t available_size;
page_size = CPU_HEAP_ALIGNMENT;
wkspace_size = rtems_configuration_get_work_space_size();
wkspace_size_with_overhead = wkspace_size + _Heap_Area_overhead( page_size );
mem = _Memory_Get();
_Assert( _Memory_Get_count( mem ) == 1 );
area = _Memory_Get_area( mem, 0 );
free_size = _Memory_Get_free_size( area );
if (
wkspace_size < wkspace_size_with_overhead &&
free_size >= wkspace_size_with_overhead
) {
uintptr_t size;
if ( rtems_configuration_get_unified_work_area() ) {
size = free_size;
} else {
size = wkspace_size_with_overhead;
}
available_size = _Heap_Initialize(
&_Workspace_Area,
_Memory_Get_free_begin( area ),
size,
page_size
);
_Memory_Consume( area, size );
} else {
/*
* An unsigned integer overflow happened, or the available free memory is
* not enough.
*/
available_size = 0;
}
if ( wkspace_size > available_size ) {
_Internal_error( INTERNAL_ERROR_TOO_LITTLE_WORKSPACE );
}
_Heap_Protection_set_delayed_free_fraction( &_Workspace_Area, 1 );
}
#ifdef __cplusplus
}
#endif
#endif /* _RTEMS_SCORE_WKSPACEINITONE_H */