1 /*----------------------------------------------------------------------------
3 *----------------------------------------------------------------------------
5 * Purpose: Interface functions for fixed memory block management system
7 *----------------------------------------------------------------------------
9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
10 * All rights reserved.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are met:
13 * - Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * - Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * - Neither the name of ARM nor the names of its contributors may be used
19 * to endorse or promote products derived from this software without
20 * specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 *---------------------------------------------------------------------------*/
35 #include "rt_TypeDef.h"
37 #include "rt_System.h"
38 #include "rt_MemBox.h"
39 #include "rt_HAL_CM.h"
41 /*----------------------------------------------------------------------------
43 *---------------------------------------------------------------------------*/
46 /*--------------------------- _init_box -------------------------------------*/
48 int _init_box (void *box_mem, U32 box_size, U32 blk_size) {
49 /* Initialize memory block system, returns 0 if OK, 1 if fails. */
55 /* Create memory structure. */
56 if (blk_size & BOX_ALIGN_8) {
57 /* Memory blocks 8-byte aligned. */
58 blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7;
59 sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7;
62 /* Memory blocks 4-byte aligned. */
63 blk_size = (blk_size + 3) & ~3;
64 sizeof_bm = sizeof (struct OS_BM);
69 if ((blk_size + sizeof_bm) > box_size) {
72 /* Create a Memory structure. */
73 blk = ((U8 *) box_mem) + sizeof_bm;
74 ((P_BM) box_mem)->free = blk;
75 end = ((U8 *) box_mem) + box_size;
76 ((P_BM) box_mem)->end = end;
77 ((P_BM) box_mem)->blk_size = blk_size;
79 /* Link all free blocks using offsets. */
80 end = ((U8 *) end) - blk_size;
82 next = ((U8 *) blk) + blk_size;
83 if (next > end) break;
84 *((void **)blk) = next;
92 /*--------------------------- rt_alloc_box ----------------------------------*/
94 void *rt_alloc_box (void *box_mem) {
95 /* Allocate a memory block and return start address. */
97 #ifndef __USE_EXCLUSIVE_ACCESS
100 irq_dis = __disable_irq ();
101 free = ((P_BM) box_mem)->free;
103 ((P_BM) box_mem)->free = *free;
105 if (!irq_dis) __enable_irq ();
108 if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) {
112 } while (__strex((U32)*free, &((P_BM) box_mem)->free));
118 /*--------------------------- _calloc_box -----------------------------------*/
120 void *_calloc_box (void *box_mem) {
121 /* Allocate a 0-initialized memory block and return start address. */
126 free = _alloc_box (box_mem);
129 for (i = ((P_BM) box_mem)->blk_size; i; i -= 4) {
138 /*--------------------------- rt_free_box -----------------------------------*/
140 int rt_free_box (void *box_mem, void *box) {
141 /* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
142 #ifndef __USE_EXCLUSIVE_ACCESS
146 if (box < box_mem || box >= ((P_BM) box_mem)->end) {
150 #ifndef __USE_EXCLUSIVE_ACCESS
151 irq_dis = __disable_irq ();
152 *((void **)box) = ((P_BM) box_mem)->free;
153 ((P_BM) box_mem)->free = box;
154 if (!irq_dis) __enable_irq ();
157 *((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free);
158 } while (__strex ((U32)box, &((P_BM) box_mem)->free));
163 /*----------------------------------------------------------------------------
165 *---------------------------------------------------------------------------*/