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-rw-r--r--nuttx/mm/mm_initialize.c216
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diff --git a/nuttx/mm/mm_initialize.c b/nuttx/mm/mm_initialize.c
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-/****************************************************************************
- * mm/mm_initialize.c
- *
- * Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * 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.
- *
- ****************************************************************************/
-
-/****************************************************************************
- * Included Files
- ****************************************************************************/
-
-#include "mm_environment.h"
-#include "mm_internal.h"
-
-/****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
-
-/****************************************************************************
- * Public Variables
- ****************************************************************************/
-
-/* This is the size of the heap provided to mm */
-
-size_t g_heapsize;
-
-/* This is the first and last nodes of the heap */
-
-FAR struct mm_allocnode_s *g_heapstart[CONFIG_MM_REGIONS];
-FAR struct mm_allocnode_s *g_heapend[CONFIG_MM_REGIONS];
-
-#if CONFIG_MM_REGIONS > 1
-int g_nregions;
-#endif
-
-/* All free nodes are maintained in a doubly linked list. This array
- * provides some hooks into the list at various points to speed searches for
- * free nodes.
- */
-
-FAR struct mm_freenode_s g_nodelist[MM_NNODES];
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: mm_initialize
- *
- * Description:
- * This is an internal OS function called only at power-up boot time.
- *
- * Parameters:
- * heapstart - Start of the initial heap region
- * heapsize - Size of the initial heap region
- *
- * Return Value:
- * None
- *
- * Assumptions:
- *
- ****************************************************************************/
-
-void mm_initialize(FAR void *heapstart, size_t heapsize)
-{
- int i;
-
- mlldbg("Heap: start=%p size=%u\n", heapstart, heapsize);
-
- /* The following two lines have cause problems for some older ZiLog
- * compilers in the past (but not the more recent). Life is easier if we
- * just the suppress them altogther for those tools.
- */
-
-#ifndef __ZILOG__
- CHECK_ALLOCNODE_SIZE;
- CHECK_FREENODE_SIZE;
-#endif
-
- /* Set up global variables */
-
- g_heapsize = 0;
-
-#if CONFIG_MM_REGIONS > 1
- g_nregions = 0;
-#endif
-
- /* Initialize the node array */
-
- memset(g_nodelist, 0, sizeof(struct mm_freenode_s) * MM_NNODES);
- for (i = 1; i < MM_NNODES; i++)
- {
- g_nodelist[i-1].flink = &g_nodelist[i];
- g_nodelist[i].blink = &g_nodelist[i-1];
- }
-
- /* Initialize the malloc semaphore to one (to support one-at-
- * a-time access to private data sets).
- */
-
- mm_seminitialize();
-
- /* Add the initial region of memory to the heap */
-
- mm_addregion(heapstart, heapsize);
-}
-
-/****************************************************************************
- * Name: mm_addregion
- *
- * Description:
- * This function gives a region of contiguous memory to the memory manager
- *
- * Parameters:
- * heapstart - Start of the heap region
- * heapsize - Size of the heap region
- *
- * Return Value:
- * None
- *
- * Assumptions:
- *
- ****************************************************************************/
-
-void mm_addregion(FAR void *heapstart, size_t heapsize)
-{
- FAR struct mm_freenode_s *node;
- uintptr_t heapbase;
- uintptr_t heapend;
-#if CONFIG_MM_REGIONS > 1
- int IDX = g_nregions;
-#else
-# define IDX 0
-#endif
-
- /* If the MCU handles wide addresses but the memory manager is configured
- * for a small heap, then verify that the caller is not doing something
- * crazy.
- */
-
-#if defined(CONFIG_MM_SMALL) && !defined(CONFIG_SMALL_MEMORY)
- DEBUGASSERT(heapsize <= MMSIZE_MAX+1);
-#endif
-
- /* Adjust the provide heap start and size so that they are both aligned
- * with the MM_MIN_CHUNK size.
- */
-
- heapbase = MM_ALIGN_UP((uintptr_t)heapstart);
- heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
- heapsize = heapend - heapbase;
-
- mlldbg("Region %d: base=%p size=%u\n", IDX+1, heapstart, heapsize);
-
- /* Add the size of this region to the total size of the heap */
-
- g_heapsize += heapsize;
-
- /* Create two "allocated" guard nodes at the beginning and end of
- * the heap. These only serve to keep us from allocating outside
- * of the heap.
- *
- * And create one free node between the guard nodes that contains
- * all available memory.
- */
-
- g_heapstart[IDX] = (FAR struct mm_allocnode_s *)heapbase;
- g_heapstart[IDX]->size = SIZEOF_MM_ALLOCNODE;
- g_heapstart[IDX]->preceding = MM_ALLOC_BIT;
-
- node = (FAR struct mm_freenode_s *)(heapbase + SIZEOF_MM_ALLOCNODE);
- node->size = heapsize - 2*SIZEOF_MM_ALLOCNODE;
- node->preceding = SIZEOF_MM_ALLOCNODE;
-
- g_heapend[IDX] = (FAR struct mm_allocnode_s *)(heapend - SIZEOF_MM_ALLOCNODE);
- g_heapend[IDX]->size = SIZEOF_MM_ALLOCNODE;
- g_heapend[IDX]->preceding = node->size | MM_ALLOC_BIT;
-
-#undef IDX
-
-#if CONFIG_MM_REGIONS > 1
- g_nregions++;
-#endif
-
- /* Add the single, large free node to the nodelist */
-
- mm_addfreechunk(node);
-}