wkspaceinitone.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 * Copyright (C) 2012, 2020 embedded brains GmbH & Co. KG
 *
 * 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
 
static inline 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 */