Alan Ffrench / Mbed 2 deprecated Experiment_2_5

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Dependencies:   mbed

mbed-rtos/rtx/rt_MemBox.c@0:52468b19aa21, 2020-07-29 (annotated)

Committer:
alanffrench
Date:
Wed Jul 29 18:51:38 2020 +0000
Revision:
0:52468b19aa21
Threads

Who changed what in which revision?

UserRevisionLine numberNew contents of line
alanffrench 0:52468b19aa21 1 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 2 * RL-ARM - RTX
alanffrench 0:52468b19aa21 3 *----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 4 * Name: RT_MEMBOX.C
alanffrench 0:52468b19aa21 5 * Purpose: Interface functions for fixed memory block management system
alanffrench 0:52468b19aa21 6 * Rev.: V4.60
alanffrench 0:52468b19aa21 7 *----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 8 *
alanffrench 0:52468b19aa21 9 * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
alanffrench 0:52468b19aa21 10 * All rights reserved.
alanffrench 0:52468b19aa21 11 * Redistribution and use in source and binary forms, with or without
alanffrench 0:52468b19aa21 12 * modification, are permitted provided that the following conditions are met:
alanffrench 0:52468b19aa21 13 * - Redistributions of source code must retain the above copyright
alanffrench 0:52468b19aa21 14 * notice, this list of conditions and the following disclaimer.
alanffrench 0:52468b19aa21 15 * - Redistributions in binary form must reproduce the above copyright
alanffrench 0:52468b19aa21 16 * notice, this list of conditions and the following disclaimer in the
alanffrench 0:52468b19aa21 17 * documentation and/or other materials provided with the distribution.
alanffrench 0:52468b19aa21 18 * - Neither the name of ARM nor the names of its contributors may be used
alanffrench 0:52468b19aa21 19 * to endorse or promote products derived from this software without
alanffrench 0:52468b19aa21 20 * specific prior written permission.
alanffrench 0:52468b19aa21 21 *
alanffrench 0:52468b19aa21 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
alanffrench 0:52468b19aa21 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
alanffrench 0:52468b19aa21 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
alanffrench 0:52468b19aa21 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
alanffrench 0:52468b19aa21 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
alanffrench 0:52468b19aa21 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
alanffrench 0:52468b19aa21 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
alanffrench 0:52468b19aa21 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
alanffrench 0:52468b19aa21 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
alanffrench 0:52468b19aa21 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
alanffrench 0:52468b19aa21 32 * POSSIBILITY OF SUCH DAMAGE.
alanffrench 0:52468b19aa21 33 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 34
alanffrench 0:52468b19aa21 35 #include "rt_TypeDef.h"
alanffrench 0:52468b19aa21 36 #include "RTX_Config.h"
alanffrench 0:52468b19aa21 37 #include "rt_System.h"
alanffrench 0:52468b19aa21 38 #include "rt_MemBox.h"
alanffrench 0:52468b19aa21 39 #include "rt_HAL_CM.h"
alanffrench 0:52468b19aa21 40
alanffrench 0:52468b19aa21 41 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 42 * Global Functions
alanffrench 0:52468b19aa21 43 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 44
alanffrench 0:52468b19aa21 45
alanffrench 0:52468b19aa21 46 /*--------------------------- _init_box -------------------------------------*/
alanffrench 0:52468b19aa21 47
alanffrench 0:52468b19aa21 48 int _init_box (void *box_mem, U32 box_size, U32 blk_size) {
alanffrench 0:52468b19aa21 49 /* Initialize memory block system, returns 0 if OK, 1 if fails. */
alanffrench 0:52468b19aa21 50 void *end;
alanffrench 0:52468b19aa21 51 void *blk;
alanffrench 0:52468b19aa21 52 void *next;
alanffrench 0:52468b19aa21 53 U32 sizeof_bm;
alanffrench 0:52468b19aa21 54
alanffrench 0:52468b19aa21 55 /* Create memory structure. */
alanffrench 0:52468b19aa21 56 if (blk_size & BOX_ALIGN_8) {
alanffrench 0:52468b19aa21 57 /* Memory blocks 8-byte aligned. */
alanffrench 0:52468b19aa21 58 blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7;
alanffrench 0:52468b19aa21 59 sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7;
alanffrench 0:52468b19aa21 60 }
alanffrench 0:52468b19aa21 61 else {
alanffrench 0:52468b19aa21 62 /* Memory blocks 4-byte aligned. */
alanffrench 0:52468b19aa21 63 blk_size = (blk_size + 3) & ~3;
alanffrench 0:52468b19aa21 64 sizeof_bm = sizeof (struct OS_BM);
alanffrench 0:52468b19aa21 65 }
alanffrench 0:52468b19aa21 66 if (blk_size == 0) {
alanffrench 0:52468b19aa21 67 return (1);
alanffrench 0:52468b19aa21 68 }
alanffrench 0:52468b19aa21 69 if ((blk_size + sizeof_bm) > box_size) {
alanffrench 0:52468b19aa21 70 return (1);
alanffrench 0:52468b19aa21 71 }
alanffrench 0:52468b19aa21 72 /* Create a Memory structure. */
alanffrench 0:52468b19aa21 73 blk = ((U8 *) box_mem) + sizeof_bm;
alanffrench 0:52468b19aa21 74 ((P_BM) box_mem)->free = blk;
alanffrench 0:52468b19aa21 75 end = ((U8 *) box_mem) + box_size;
alanffrench 0:52468b19aa21 76 ((P_BM) box_mem)->end = end;
alanffrench 0:52468b19aa21 77 ((P_BM) box_mem)->blk_size = blk_size;
alanffrench 0:52468b19aa21 78
alanffrench 0:52468b19aa21 79 /* Link all free blocks using offsets. */
alanffrench 0:52468b19aa21 80 end = ((U8 *) end) - blk_size;
alanffrench 0:52468b19aa21 81 while (1) {
alanffrench 0:52468b19aa21 82 next = ((U8 *) blk) + blk_size;
alanffrench 0:52468b19aa21 83 if (next > end) break;
alanffrench 0:52468b19aa21 84 *((void **)blk) = next;
alanffrench 0:52468b19aa21 85 blk = next;
alanffrench 0:52468b19aa21 86 }
alanffrench 0:52468b19aa21 87 /* end marker */
alanffrench 0:52468b19aa21 88 *((void **)blk) = 0;
alanffrench 0:52468b19aa21 89 return (0);
alanffrench 0:52468b19aa21 90 }
alanffrench 0:52468b19aa21 91
alanffrench 0:52468b19aa21 92 /*--------------------------- rt_alloc_box ----------------------------------*/
alanffrench 0:52468b19aa21 93
alanffrench 0:52468b19aa21 94 void *rt_alloc_box (void *box_mem) {
alanffrench 0:52468b19aa21 95 /* Allocate a memory block and return start address. */
alanffrench 0:52468b19aa21 96 void **free;
alanffrench 0:52468b19aa21 97 #ifndef __USE_EXCLUSIVE_ACCESS
alanffrench 0:52468b19aa21 98 int irq_dis;
alanffrench 0:52468b19aa21 99
alanffrench 0:52468b19aa21 100 irq_dis = __disable_irq ();
alanffrench 0:52468b19aa21 101 free = ((P_BM) box_mem)->free;
alanffrench 0:52468b19aa21 102 if (free) {
alanffrench 0:52468b19aa21 103 ((P_BM) box_mem)->free = *free;
alanffrench 0:52468b19aa21 104 }
alanffrench 0:52468b19aa21 105 if (!irq_dis) __enable_irq ();
alanffrench 0:52468b19aa21 106 #else
alanffrench 0:52468b19aa21 107 do {
alanffrench 0:52468b19aa21 108 if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) {
alanffrench 0:52468b19aa21 109 __clrex();
alanffrench 0:52468b19aa21 110 break;
alanffrench 0:52468b19aa21 111 }
alanffrench 0:52468b19aa21 112 } while (__strex((U32)*free, &((P_BM) box_mem)->free));
alanffrench 0:52468b19aa21 113 #endif
alanffrench 0:52468b19aa21 114 return (free);
alanffrench 0:52468b19aa21 115 }
alanffrench 0:52468b19aa21 116
alanffrench 0:52468b19aa21 117
alanffrench 0:52468b19aa21 118 /*--------------------------- _calloc_box -----------------------------------*/
alanffrench 0:52468b19aa21 119
alanffrench 0:52468b19aa21 120 void *_calloc_box (void *box_mem) {
alanffrench 0:52468b19aa21 121 /* Allocate a 0-initialized memory block and return start address. */
alanffrench 0:52468b19aa21 122 void *free;
alanffrench 0:52468b19aa21 123 U32 *p;
alanffrench 0:52468b19aa21 124 U32 i;
alanffrench 0:52468b19aa21 125
alanffrench 0:52468b19aa21 126 free = _alloc_box (box_mem);
alanffrench 0:52468b19aa21 127 if (free) {
alanffrench 0:52468b19aa21 128 p = free;
alanffrench 0:52468b19aa21 129 for (i = ((P_BM) box_mem)->blk_size; i; i -= 4) {
alanffrench 0:52468b19aa21 130 *p = 0;
alanffrench 0:52468b19aa21 131 p++;
alanffrench 0:52468b19aa21 132 }
alanffrench 0:52468b19aa21 133 }
alanffrench 0:52468b19aa21 134 return (free);
alanffrench 0:52468b19aa21 135 }
alanffrench 0:52468b19aa21 136
alanffrench 0:52468b19aa21 137
alanffrench 0:52468b19aa21 138 /*--------------------------- rt_free_box -----------------------------------*/
alanffrench 0:52468b19aa21 139
alanffrench 0:52468b19aa21 140 int rt_free_box (void *box_mem, void *box) {
alanffrench 0:52468b19aa21 141 /* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
alanffrench 0:52468b19aa21 142 #ifndef __USE_EXCLUSIVE_ACCESS
alanffrench 0:52468b19aa21 143 int irq_dis;
alanffrench 0:52468b19aa21 144 #endif
alanffrench 0:52468b19aa21 145
alanffrench 0:52468b19aa21 146 if (box < box_mem || box >= ((P_BM) box_mem)->end) {
alanffrench 0:52468b19aa21 147 return (1);
alanffrench 0:52468b19aa21 148 }
alanffrench 0:52468b19aa21 149
alanffrench 0:52468b19aa21 150 #ifndef __USE_EXCLUSIVE_ACCESS
alanffrench 0:52468b19aa21 151 irq_dis = __disable_irq ();
alanffrench 0:52468b19aa21 152 *((void **)box) = ((P_BM) box_mem)->free;
alanffrench 0:52468b19aa21 153 ((P_BM) box_mem)->free = box;
alanffrench 0:52468b19aa21 154 if (!irq_dis) __enable_irq ();
alanffrench 0:52468b19aa21 155 #else
alanffrench 0:52468b19aa21 156 do {
alanffrench 0:52468b19aa21 157 *((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free);
alanffrench 0:52468b19aa21 158 } while (__strex ((U32)box, &((P_BM) box_mem)->free));
alanffrench 0:52468b19aa21 159 #endif
alanffrench 0:52468b19aa21 160 return (0);
alanffrench 0:52468b19aa21 161 }
alanffrench 0:52468b19aa21 162
alanffrench 0:52468b19aa21 163 /*----------------------------------------------------------------------------
alanffrench 0:52468b19aa21 164 * end of file
alanffrench 0:52468b19aa21 165 *---------------------------------------------------------------------------*/
alanffrench 0:52468b19aa21 166