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Dependencies:   mbed

Fork of FYDP_Final2 by Dave Lu

mbed-rtos/rtx/rt_MemBox.c@8:3d5a84b897be, 2015-03-25 (annotated)

Committer:
tntmarket
Date:
Wed Mar 25 11:44:05 2015 +0000
Revision:
8:3d5a84b897be
Parent:
mbed/mbed-rtos/rtx/rt_MemBox.c@0:21019d94ad33 
lift folders

Who changed what in which revision?

UserRevisionLine numberNew contents of line
majik 0:21019d94ad33 1 /*----------------------------------------------------------------------------
majik 0:21019d94ad33 2 * RL-ARM - RTX
majik 0:21019d94ad33 3 *----------------------------------------------------------------------------
majik 0:21019d94ad33 4 * Name: RT_MEMBOX.C
majik 0:21019d94ad33 5 * Purpose: Interface functions for fixed memory block management system
majik 0:21019d94ad33 6 * Rev.: V4.60
majik 0:21019d94ad33 7 *----------------------------------------------------------------------------
majik 0:21019d94ad33 8 *
majik 0:21019d94ad33 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
majik 0:21019d94ad33 10 * All rights reserved.
majik 0:21019d94ad33 11 * Redistribution and use in source and binary forms, with or without
majik 0:21019d94ad33 12 * modification, are permitted provided that the following conditions are met:
majik 0:21019d94ad33 13 * - Redistributions of source code must retain the above copyright
majik 0:21019d94ad33 14 * notice, this list of conditions and the following disclaimer.
majik 0:21019d94ad33 15 * - Redistributions in binary form must reproduce the above copyright
majik 0:21019d94ad33 16 * notice, this list of conditions and the following disclaimer in the
majik 0:21019d94ad33 17 * documentation and/or other materials provided with the distribution.
majik 0:21019d94ad33 18 * - Neither the name of ARM nor the names of its contributors may be used
majik 0:21019d94ad33 19 * to endorse or promote products derived from this software without
majik 0:21019d94ad33 20 * specific prior written permission.
majik 0:21019d94ad33 21 *
majik 0:21019d94ad33 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
majik 0:21019d94ad33 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
majik 0:21019d94ad33 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
majik 0:21019d94ad33 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
majik 0:21019d94ad33 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
majik 0:21019d94ad33 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
majik 0:21019d94ad33 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
majik 0:21019d94ad33 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
majik 0:21019d94ad33 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
majik 0:21019d94ad33 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
majik 0:21019d94ad33 32 * POSSIBILITY OF SUCH DAMAGE.
majik 0:21019d94ad33 33 *---------------------------------------------------------------------------*/
majik 0:21019d94ad33 34
majik 0:21019d94ad33 35 #include "rt_TypeDef.h"
majik 0:21019d94ad33 36 #include "RTX_Conf.h"
majik 0:21019d94ad33 37 #include "rt_System.h"
majik 0:21019d94ad33 38 #include "rt_MemBox.h"
majik 0:21019d94ad33 39 #include "rt_HAL_CM.h"
majik 0:21019d94ad33 40
majik 0:21019d94ad33 41 /*----------------------------------------------------------------------------
majik 0:21019d94ad33 42 * Global Functions
majik 0:21019d94ad33 43 *---------------------------------------------------------------------------*/
majik 0:21019d94ad33 44
majik 0:21019d94ad33 45
majik 0:21019d94ad33 46 /*--------------------------- _init_box -------------------------------------*/
majik 0:21019d94ad33 47
majik 0:21019d94ad33 48 int _init_box (void *box_mem, U32 box_size, U32 blk_size) {
majik 0:21019d94ad33 49 /* Initialize memory block system, returns 0 if OK, 1 if fails. */
majik 0:21019d94ad33 50 void *end;
majik 0:21019d94ad33 51 void *blk;
majik 0:21019d94ad33 52 void *next;
majik 0:21019d94ad33 53 U32 sizeof_bm;
majik 0:21019d94ad33 54
majik 0:21019d94ad33 55 /* Create memory structure. */
majik 0:21019d94ad33 56 if (blk_size & BOX_ALIGN_8) {
majik 0:21019d94ad33 57 /* Memory blocks 8-byte aligned. */
majik 0:21019d94ad33 58 blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7;
majik 0:21019d94ad33 59 sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7;
majik 0:21019d94ad33 60 }
majik 0:21019d94ad33 61 else {
majik 0:21019d94ad33 62 /* Memory blocks 4-byte aligned. */
majik 0:21019d94ad33 63 blk_size = (blk_size + 3) & ~3;
majik 0:21019d94ad33 64 sizeof_bm = sizeof (struct OS_BM);
majik 0:21019d94ad33 65 }
majik 0:21019d94ad33 66 if (blk_size == 0) {
majik 0:21019d94ad33 67 return (1);
majik 0:21019d94ad33 68 }
majik 0:21019d94ad33 69 if ((blk_size + sizeof_bm) > box_size) {
majik 0:21019d94ad33 70 return (1);
majik 0:21019d94ad33 71 }
majik 0:21019d94ad33 72 /* Create a Memory structure. */
majik 0:21019d94ad33 73 blk = ((U8 *) box_mem) + sizeof_bm;
majik 0:21019d94ad33 74 ((P_BM) box_mem)->free = blk;
majik 0:21019d94ad33 75 end = ((U8 *) box_mem) + box_size;
majik 0:21019d94ad33 76 ((P_BM) box_mem)->end = end;
majik 0:21019d94ad33 77 ((P_BM) box_mem)->blk_size = blk_size;
majik 0:21019d94ad33 78
majik 0:21019d94ad33 79 /* Link all free blocks using offsets. */
majik 0:21019d94ad33 80 end = ((U8 *) end) - blk_size;
majik 0:21019d94ad33 81 while (1) {
majik 0:21019d94ad33 82 next = ((U8 *) blk) + blk_size;
majik 0:21019d94ad33 83 if (next > end) break;
majik 0:21019d94ad33 84 *((void **)blk) = next;
majik 0:21019d94ad33 85 blk = next;
majik 0:21019d94ad33 86 }
majik 0:21019d94ad33 87 /* end marker */
majik 0:21019d94ad33 88 *((void **)blk) = 0;
majik 0:21019d94ad33 89 return (0);
majik 0:21019d94ad33 90 }
majik 0:21019d94ad33 91
majik 0:21019d94ad33 92 /*--------------------------- rt_alloc_box ----------------------------------*/
majik 0:21019d94ad33 93
majik 0:21019d94ad33 94 void *rt_alloc_box (void *box_mem) {
majik 0:21019d94ad33 95 /* Allocate a memory block and return start address. */
majik 0:21019d94ad33 96 void **free;
majik 0:21019d94ad33 97 #ifndef __USE_EXCLUSIVE_ACCESS
majik 0:21019d94ad33 98 int irq_dis;
majik 0:21019d94ad33 99
majik 0:21019d94ad33 100 irq_dis = __disable_irq ();
majik 0:21019d94ad33 101 free = ((P_BM) box_mem)->free;
majik 0:21019d94ad33 102 if (free) {
majik 0:21019d94ad33 103 ((P_BM) box_mem)->free = *free;
majik 0:21019d94ad33 104 }
majik 0:21019d94ad33 105 if (!irq_dis) __enable_irq ();
majik 0:21019d94ad33 106 #else
majik 0:21019d94ad33 107 do {
majik 0:21019d94ad33 108 if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) {
majik 0:21019d94ad33 109 __clrex();
majik 0:21019d94ad33 110 break;
majik 0:21019d94ad33 111 }
majik 0:21019d94ad33 112 } while (__strex((U32)*free, &((P_BM) box_mem)->free));
majik 0:21019d94ad33 113 #endif
majik 0:21019d94ad33 114 return (free);
majik 0:21019d94ad33 115 }
majik 0:21019d94ad33 116
majik 0:21019d94ad33 117
majik 0:21019d94ad33 118 /*--------------------------- _calloc_box -----------------------------------*/
majik 0:21019d94ad33 119
majik 0:21019d94ad33 120 void *_calloc_box (void *box_mem) {
majik 0:21019d94ad33 121 /* Allocate a 0-initialized memory block and return start address. */
majik 0:21019d94ad33 122 void *free;
majik 0:21019d94ad33 123 U32 *p;
majik 0:21019d94ad33 124 U32 i;
majik 0:21019d94ad33 125
majik 0:21019d94ad33 126 free = _alloc_box (box_mem);
majik 0:21019d94ad33 127 if (free) {
majik 0:21019d94ad33 128 p = free;
majik 0:21019d94ad33 129 for (i = ((P_BM) box_mem)->blk_size; i; i -= 4) {
majik 0:21019d94ad33 130 *p = 0;
majik 0:21019d94ad33 131 p++;
majik 0:21019d94ad33 132 }
majik 0:21019d94ad33 133 }
majik 0:21019d94ad33 134 return (free);
majik 0:21019d94ad33 135 }
majik 0:21019d94ad33 136
majik 0:21019d94ad33 137
majik 0:21019d94ad33 138 /*--------------------------- rt_free_box -----------------------------------*/
majik 0:21019d94ad33 139
majik 0:21019d94ad33 140 int rt_free_box (void *box_mem, void *box) {
majik 0:21019d94ad33 141 /* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
majik 0:21019d94ad33 142 #ifndef __USE_EXCLUSIVE_ACCESS
majik 0:21019d94ad33 143 int irq_dis;
majik 0:21019d94ad33 144 #endif
majik 0:21019d94ad33 145
majik 0:21019d94ad33 146 if (box < box_mem || box >= ((P_BM) box_mem)->end) {
majik 0:21019d94ad33 147 return (1);
majik 0:21019d94ad33 148 }
majik 0:21019d94ad33 149
majik 0:21019d94ad33 150 #ifndef __USE_EXCLUSIVE_ACCESS
majik 0:21019d94ad33 151 irq_dis = __disable_irq ();
majik 0:21019d94ad33 152 *((void **)box) = ((P_BM) box_mem)->free;
majik 0:21019d94ad33 153 ((P_BM) box_mem)->free = box;
majik 0:21019d94ad33 154 if (!irq_dis) __enable_irq ();
majik 0:21019d94ad33 155 #else
majik 0:21019d94ad33 156 do {
majik 0:21019d94ad33 157 *((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free);
majik 0:21019d94ad33 158 } while (__strex ((U32)box, &((P_BM) box_mem)->free));
majik 0:21019d94ad33 159 #endif
majik 0:21019d94ad33 160 return (0);
majik 0:21019d94ad33 161 }
majik 0:21019d94ad33 162
majik 0:21019d94ad33 163 /*----------------------------------------------------------------------------
majik 0:21019d94ad33 164 * end of file
majik 0:21019d94ad33 165 *---------------------------------------------------------------------------*/
majik 0:21019d94ad33 166