217 lines
6.7 KiB
C
217 lines
6.7 KiB
C
/****************************************************************************
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* mm/mm_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 NuttX 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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* Pre-processor 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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size_t g_heapsize;
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/* This is the first and last nodes of the heap */
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FAR struct mm_allocnode_s *g_heapstart[CONFIG_MM_REGIONS];
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FAR struct mm_allocnode_s *g_heapend[CONFIG_MM_REGIONS];
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#if CONFIG_MM_REGIONS > 1
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int g_nregions;
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#endif
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/* All free nodes are maintained in a doubly linked list. This array
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* provides some hooks into the list at various points to speed searches for
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* free nodes.
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*/
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FAR 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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* Name: 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 boot time.
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*
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* Parameters:
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* heapstart - Start of the initial heap region
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* heapsize - Size of the initial heap region
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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(FAR void *heapstart, size_t heapsize)
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{
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int i;
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mlldbg("Heap: start=%p size=%u\n", heapstart, heapsize);
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/* The following two lines have cause problems for some ZiLog compilers
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* in the past. Life is easier if we just the suppress them for those
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* tools.
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*/
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#ifndef __ZILOG__
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CHECK_ALLOCNODE_SIZE;
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CHECK_FREENODE_SIZE;
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#endif
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/* Set up global variables */
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g_heapsize = 0;
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#if CONFIG_MM_REGIONS > 1
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g_nregions = 0;
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#endif
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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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/* 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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/* Add the initial region of memory to the heap */
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mm_addregion(heapstart, heapsize);
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}
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/****************************************************************************
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* Name: mm_addregion
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*
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* Description:
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* This function gives a region of contiguous memory to the memory manager
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*
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* Parameters:
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* heapstart - Start of the heap region
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* heapsize - Size of the heap region
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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_addregion(FAR void *heapstart, size_t heapsize)
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{
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FAR struct mm_freenode_s *node;
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uintptr_t heapbase;
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uintptr_t heapend;
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#if CONFIG_MM_REGIONS > 1
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int IDX = g_nregions;
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#else
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# define IDX 0
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#endif
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/* If the MCU handles wide addresses but the memory manager is configured
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* for a small heap, then verify that the caller is not doing something
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* crazy.
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*/
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#if defined(CONFIG_MM_SMALL) && !defined(CONFIG_SMALL_MEMORY)
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DEBUGASSERT(heapsize <= MMSIZE_MAX+1);
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#endif
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/* Adjust the provide heap start and size so that they are both aligned
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* with the MM_MIN_CHUNK size.
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*/
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heapbase = MM_ALIGN_UP((uintptr_t)heapstart);
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heapend = MM_ALIGN_DOWN((uintptr_t)heapstart + (uintptr_t)heapsize);
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heapsize = heapend - heapbase;
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mlldbg("Region %d: base=%p size=%u\n", IDX+1, heapstart, heapsize);
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/* Add the size of this region to the total size of the heap */
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g_heapsize += heapsize;
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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[IDX] = (FAR struct mm_allocnode_s *)heapbase;
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g_heapstart[IDX]->size = SIZEOF_MM_ALLOCNODE;
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g_heapstart[IDX]->preceding = MM_ALLOC_BIT;
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node = (FAR struct mm_freenode_s *)(heapbase + SIZEOF_MM_ALLOCNODE);
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node->size = heapsize - 2*SIZEOF_MM_ALLOCNODE;
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node->preceding = SIZEOF_MM_ALLOCNODE;
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g_heapend[IDX] = (FAR struct mm_allocnode_s *)(heapend - SIZEOF_MM_ALLOCNODE);
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g_heapend[IDX]->size = SIZEOF_MM_ALLOCNODE;
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g_heapend[IDX]->preceding = node->size | MM_ALLOC_BIT;
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#undef IDX
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#if CONFIG_MM_REGIONS > 1
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g_nregions++;
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#endif
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/* Add the single, large free node to the nodelist */
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mm_addfreechunk(node);
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}
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