144 lines
4.5 KiB
C
144 lines
4.5 KiB
C
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: RT_MEMORY.C
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* Purpose: Interface functions for Dynamic Memory Management System
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* Rev.: V4.60
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*----------------------------------------------------------------------------
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*
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* Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
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* All rights reserved.
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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 are met:
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* - 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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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* - Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN 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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#include "rt_Memory.h"
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#include "rt_TypeDef.h"
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/* Functions */
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// Initialize Dynamic Memory pool
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// Parameters:
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// pool: Pointer to memory pool
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// size: Size of memory pool in bytes
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// Return: 0 - OK, 1 - Error
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int rt_init_mem(void *pool, U32 size) {
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MEMP *ptr;
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if ((pool == NULL) || (size < sizeof(MEMP)))
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return (1);
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ptr = (MEMP *)pool;
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ptr->next = (MEMP *)((U32)pool + size - sizeof(MEMP *));
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ptr->next->next = NULL;
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ptr->len = 0;
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return (0);
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}
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// Allocate Memory from Memory pool
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// Parameters:
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// pool: Pointer to memory pool
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// size: Size of memory in bytes to allocate
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// Return: Pointer to allocated memory
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void *rt_alloc_mem(void *pool, U32 size) {
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MEMP *p, *p_search, *p_new;
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U32 hole_size;
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if ((pool == NULL) || (size == 0))
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return NULL;
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/* Add header offset to 'size' */
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size += sizeof(MEMP);
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/* Make sure that block is 4-byte aligned */
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size = (size + 3) & ~3;
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p_search = (MEMP *)pool;
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while (1) {
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hole_size = (U32)p_search->next - (U32)p_search;
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hole_size -= p_search->len;
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/* Check if hole size is big enough */
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if (hole_size >= size)
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break;
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p_search = p_search->next;
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if (p_search->next == NULL) {
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/* Failed, we are at the end of the list */
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return NULL;
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}
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}
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if (p_search->len == 0) {
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/* No block is allocated, set the Length of the first element */
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p_search->len = size;
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p = (MEMP *)(((U32)p_search) + sizeof(MEMP));
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} else {
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/* Insert new list element into the memory list */
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p_new = (MEMP *)((U32)p_search + p_search->len);
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p_new->next = p_search->next;
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p_new->len = size;
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p_search->next = p_new;
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p = (MEMP *)(((U32)p_new) + sizeof(MEMP));
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}
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return (p);
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}
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// Free Memory and return it to Memory pool
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// Parameters:
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// pool: Pointer to memory pool
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// mem: Pointer to memory to free
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// Return: 0 - OK, 1 - Error
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int rt_free_mem(void *pool, void *mem) {
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MEMP *p_search, *p_prev, *p_return;
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if ((pool == NULL) || (mem == NULL))
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return (1);
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p_return = (MEMP *)((U32)mem - sizeof(MEMP));
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/* Set list header */
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p_prev = NULL;
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p_search = (MEMP *)pool;
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while (p_search != p_return) {
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p_prev = p_search;
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p_search = p_search->next;
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if (p_search == NULL) {
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/* Valid Memory block not found */
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return (1);
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}
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}
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if (p_prev == NULL) {
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/* First block to be released, only set length to 0 */
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p_search->len = 0;
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} else {
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/* Discard block from chain list */
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p_prev->next = p_search->next;
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}
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return (0);
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}
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