mallocinitone.h

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/* SPDX-License-Identifier: BSD-2-Clause */

/*
 * 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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 */

#ifndef _RTEMS_MALLOCINITONE_H
#define _RTEMS_MALLOCINITONE_H

#include <rtems/malloc.h>
#include <rtems/score/assert.h>
#include <rtems/score/heapimpl.h>

#ifdef __cplusplus
extern "C" {
#endif

RTEMS_INLINE_ROUTINE Heap_Control *_Malloc_Initialize_with_one_area(
  Heap_Control *heap
)
{
  const Memory_Information *mem;
  Memory_Area              *area;
  uintptr_t                 space_available;

  mem = _Memory_Get();
  _Assert( _Memory_Get_count( mem ) == 1 );

  RTEMS_Malloc_Heap = heap;
  area = _Memory_Get_area( mem, 0 );
  space_available = _Heap_Initialize(
    heap,
    _Memory_Get_free_begin( area ),
    _Memory_Get_free_size( area ),
    CPU_HEAP_ALIGNMENT
  );

  if ( space_available > 0 ) {
    _Memory_Consume( area, _Memory_Get_free_size( area ) );
  } else {
    _Internal_error( INTERNAL_ERROR_NO_MEMORY_FOR_HEAP );
  }

  return heap;
}

#ifdef __cplusplus
}
#endif

#endif /* _RTEMS_MALLOCINITONE_H */