171 wiersze
5.3 KiB
C
171 wiersze
5.3 KiB
C
/*----------------------------------------------------------------------------
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* RL-ARM - RTX
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*----------------------------------------------------------------------------
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* Name: RT_MEMBOX.C
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* Purpose: Interface functions for fixed memory block 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_TypeDef.h"
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#include "RTX_Config.h"
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#include "rt_System.h"
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#include "rt_MemBox.h"
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#ifdef __CORTEX_A9
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#include "rt_HAL_CA.h"
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#else
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#include "rt_HAL_CM.h"
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#endif
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/*----------------------------------------------------------------------------
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* Global Functions
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*---------------------------------------------------------------------------*/
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/*--------------------------- _init_box -------------------------------------*/
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int _init_box (void *box_mem, U32 box_size, U32 blk_size) {
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/* Initialize memory block system, returns 0 if OK, 1 if fails. */
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void *end;
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void *blk;
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void *next;
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U32 sizeof_bm;
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/* Create memory structure. */
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if (blk_size & BOX_ALIGN_8) {
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/* Memory blocks 8-byte aligned. */
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blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7;
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sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7;
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}
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else {
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/* Memory blocks 4-byte aligned. */
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blk_size = (blk_size + 3) & ~3;
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sizeof_bm = sizeof (struct OS_BM);
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}
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if (blk_size == 0) {
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return (1);
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}
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if ((blk_size + sizeof_bm) > box_size) {
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return (1);
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}
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/* Create a Memory structure. */
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blk = ((U8 *) box_mem) + sizeof_bm;
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((P_BM) box_mem)->free = blk;
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end = ((U8 *) box_mem) + box_size;
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((P_BM) box_mem)->end = end;
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((P_BM) box_mem)->blk_size = blk_size;
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/* Link all free blocks using offsets. */
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end = ((U8 *) end) - blk_size;
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while (1) {
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next = ((U8 *) blk) + blk_size;
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if (next > end) break;
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*((void **)blk) = next;
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blk = next;
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}
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/* end marker */
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*((void **)blk) = 0;
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return (0);
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}
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/*--------------------------- rt_alloc_box ----------------------------------*/
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void *rt_alloc_box (void *box_mem) {
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/* Allocate a memory block and return start address. */
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void **free;
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#ifndef __USE_EXCLUSIVE_ACCESS
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int irq_dis;
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irq_dis = __disable_irq ();
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free = ((P_BM) box_mem)->free;
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if (free) {
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((P_BM) box_mem)->free = *free;
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}
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if (!irq_dis) __enable_irq ();
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#else
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do {
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if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) {
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__clrex();
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break;
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}
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} while (__strex((U32)*free, &((P_BM) box_mem)->free));
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#endif
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return (free);
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}
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/*--------------------------- _calloc_box -----------------------------------*/
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void *_calloc_box (void *box_mem) {
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/* Allocate a 0-initialized memory block and return start address. */
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void *free;
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U32 *p;
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U32 i;
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free = _alloc_box (box_mem);
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if (free) {
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p = free;
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for (i = ((P_BM) box_mem)->blk_size; i; i -= 4) {
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*p = 0;
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p++;
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}
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}
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return (free);
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}
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/*--------------------------- rt_free_box -----------------------------------*/
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int rt_free_box (void *box_mem, void *box) {
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/* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
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#ifndef __USE_EXCLUSIVE_ACCESS
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int irq_dis;
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#endif
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if (box < box_mem || box >= ((P_BM) box_mem)->end) {
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return (1);
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}
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#ifndef __USE_EXCLUSIVE_ACCESS
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irq_dis = __disable_irq ();
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*((void **)box) = ((P_BM) box_mem)->free;
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((P_BM) box_mem)->free = box;
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if (!irq_dis) __enable_irq ();
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#else
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do {
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*((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free);
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} while (__strex ((U32)box, &((P_BM) box_mem)->free));
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#endif
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return (0);
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}
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/*----------------------------------------------------------------------------
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* end of file
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*---------------------------------------------------------------------------*/
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