b08a86171f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3 42af7a65-404d-4744-a932-0658087f49c3
146 lines
4.7 KiB
C
146 lines
4.7 KiB
C
/************************************************************
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* mm_initialize.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************/
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/************************************************************
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* Included Files
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************************************************************/
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#include "mm_environment.h"
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#include "mm_internal.h"
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Public Variables
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************************************************************/
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/* This is the size of the heap provided to mm */
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uint32 g_heapsize;
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/* This is the first and last nodes of the heap */
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struct mm_allocnode_s *g_heapstart;
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struct mm_allocnode_s *g_heapend;
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/* All free nodes are maintained in a doubly linked list. This
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* array provides some hooks into the list at various points to
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* speed searches for free nodes.
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*/
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struct mm_freenode_s g_nodelist[MM_NNODES];
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/************************************************************
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* Public Functions
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************************************************************/
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/************************************************************
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* Function: mm_initialize
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*
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* Description:
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* This is an internal OS function called only at power-up
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* boot time.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* None
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*
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* Assumptions:
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*
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************************************************************/
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void mm_initialize(void *heapstart, size_t heapsize)
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{
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struct mm_freenode_s *node;
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int i;
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CHECK_ALLOCNODE_SIZE;
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CHECK_FREENODE_SIZE;
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/* Adjust the provide heap start and size so that they are
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* both aligned with the MM_MIN_CHUNK size.
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*/
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uint32 heapbase = MM_ALIGN_UP((uint32)heapstart);
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uint32 heapend = MM_ALIGN_DOWN((uint32)heapstart + (uint32)heapsize);
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/* Save the size of the heap */
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g_heapsize = heapend - heapbase;
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/* Initialize the node array */
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memset(g_nodelist, 0, sizeof(struct mm_freenode_s) * MM_NNODES);
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for (i = 1; i < MM_NNODES; i++)
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{
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g_nodelist[i-1].flink = &g_nodelist[i];
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g_nodelist[i].blink = &g_nodelist[i-1];
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}
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/* Create two "allocated" guard nodes at the beginning and end of
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* the heap. These only serve to keep us from allocating outside
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* of the heap.
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*
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* And create one free node between the guard nodes that contains
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* all available memory.
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*/
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g_heapstart = (struct mm_allocnode_s *)heapbase;
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g_heapstart->size = SIZEOF_MM_ALLOCNODE;
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g_heapstart->preceding = MM_ALLOC_BIT;
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node = (struct mm_freenode_s *)(heapbase + SIZEOF_MM_ALLOCNODE);
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node->size = g_heapsize - 2*SIZEOF_MM_ALLOCNODE;
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node->preceding = SIZEOF_MM_ALLOCNODE;
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g_heapend = (struct mm_allocnode_s *)(heapend - SIZEOF_MM_ALLOCNODE);
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g_heapend->size = SIZEOF_MM_ALLOCNODE;
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g_heapend->preceding = node->size | MM_ALLOC_BIT;
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/* Add the single, large free node to the nodelist */
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mm_addfreechunk(node);
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/* Initialize the malloc semaphore to one (to support one-at-
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* a-time access to private data sets.
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*/
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mm_seminitialize();
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}
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