incubator-nuttx/mm/mm_heap/mm_brkaddr.c

/****************************************************************************
 * mm/mm_heap/mm_brkaddr.c
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The
 * ASF licenses this file to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <assert.h>

#include <nuttx/mm/mm.h>

#include "mm_heap/mm.h"

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: mm_brkaddr
 *
 * Description:
 *   Return the break address of a heap region.  Zero is returned if the
 *   memory region is not initialized.
 *
 ****************************************************************************/

FAR void *mm_brkaddr(FAR struct mm_heap_s *heap, int region)
{
  uintptr_t brkaddr;

#if CONFIG_MM_REGIONS > 1
  DEBUGASSERT(heap && region < heap->mm_nregions);
#else
  DEBUGASSERT(heap && region == 0);
#endif

  brkaddr = (uintptr_t)heap->mm_heapend[region];
  return brkaddr ? (FAR void *)(brkaddr + SIZEOF_MM_ALLOCNODE) : NULL;
}