tmk_core/tool/mbed/mbed-sdk/libraries/rtos/rtx/TARGET_CORTEX_A/rt_MemBox.c

   1 /*----------------------------------------------------------------------------
   2  *      RL-ARM - RTX
   3  *----------------------------------------------------------------------------
   4  *      Name:    RT_MEMBOX.C
   5  *      Purpose: Interface functions for fixed memory block management system
   6  *      Rev.:    V4.60
   7  *----------------------------------------------------------------------------
   8  *
   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.
  21  *
  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  *---------------------------------------------------------------------------*/
  34
  35 #include "rt_TypeDef.h"
  36 #include "RTX_Config.h"
  37 #include "rt_System.h"
  38 #include "rt_MemBox.h"
  39 #ifdef __CORTEX_A9
  40 #include "rt_HAL_CA.h"
  41 #else
  42 #include "rt_HAL_CM.h"
  43 #endif
  44
  45 /*----------------------------------------------------------------------------
  46  *      Global Functions
  47  *---------------------------------------------------------------------------*/
  48
  49
  50 /*--------------------------- _init_box -------------------------------------*/
  51
  52 int _init_box  (void *box_mem, U32 box_size, U32 blk_size) {
  53   /* Initialize memory block system, returns 0 if OK, 1 if fails. */
  54   void *end;
  55   void *blk;
  56   void *next;
  57   U32  sizeof_bm;
  58
  59   /* Create memory structure. */
  60   if (blk_size & BOX_ALIGN_8) {
  61     /* Memory blocks 8-byte aligned. */
  62     blk_size = ((blk_size & ~BOX_ALIGN_8) + 7) & ~7;
  63     sizeof_bm = (sizeof (struct OS_BM) + 7) & ~7;
  64   }
  65   else {
  66     /* Memory blocks 4-byte aligned. */
  67     blk_size = (blk_size + 3) & ~3;
  68     sizeof_bm = sizeof (struct OS_BM);
  69   }
  70   if (blk_size == 0) {
  71     return (1);
  72   }
  73   if ((blk_size + sizeof_bm) > box_size) {
  74     return (1);
  75   }
  76   /* Create a Memory structure. */
  77   blk = ((U8 *) box_mem) + sizeof_bm;
  78   ((P_BM) box_mem)->free = blk;
  79   end = ((U8 *) box_mem) + box_size;
  80   ((P_BM) box_mem)->end      = end;
  81   ((P_BM) box_mem)->blk_size = blk_size;
  82
  83   /* Link all free blocks using offsets. */
  84   end = ((U8 *) end) - blk_size;
  85   while (1)  {
  86     next = ((U8 *) blk) + blk_size;
  87     if (next > end)  break;
  88     *((void **)blk) = next;
  89     blk = next;
  90   }
  91   /* end marker */
  92   *((void **)blk) = 0;
  93   return (0);
  94 }
  95
  96 /*--------------------------- rt_alloc_box ----------------------------------*/
  97
  98 void *rt_alloc_box (void *box_mem) {
  99   /* Allocate a memory block and return start address. */
 100   void **free;
 101 #ifndef __USE_EXCLUSIVE_ACCESS
 102   int  irq_dis;
 103
 104   irq_dis = __disable_irq ();
 105   free = ((P_BM) box_mem)->free;
 106   if (free) {
 107     ((P_BM) box_mem)->free = *free;
 108   }
 109   if (!irq_dis) __enable_irq ();
 110 #else
 111   do {
 112     if ((free = (void **)__ldrex(&((P_BM) box_mem)->free)) == 0) {
 113       __clrex();
 114       break;
 115     }
 116   } while (__strex((U32)*free, &((P_BM) box_mem)->free));
 117 #endif
 118   return (free);
 119 }
 120
 121
 122 /*--------------------------- _calloc_box -----------------------------------*/
 123
 124 void *_calloc_box (void *box_mem)  {
 125   /* Allocate a 0-initialized memory block and return start address. */
 126   void *free;
 127   U32 *p;
 128   U32 i;
 129
 130   free = _alloc_box (box_mem);
 131   if (free)  {
 132     p = free;
 133     for (i = ((P_BM) box_mem)->blk_size; i; i -= 4)  {
 134       *p = 0;
 135       p++;
 136     }
 137   }
 138   return (free);
 139 }
 140
 141
 142 /*--------------------------- rt_free_box -----------------------------------*/
 143
 144 int rt_free_box (void *box_mem, void *box) {
 145   /* Free a memory block, returns 0 if OK, 1 if box does not belong to box_mem */
 146 #ifndef __USE_EXCLUSIVE_ACCESS
 147   int irq_dis;
 148 #endif
 149
 150   if (box < box_mem || box >= ((P_BM) box_mem)->end) {
 151     return (1);
 152   }
 153
 154 #ifndef __USE_EXCLUSIVE_ACCESS
 155   irq_dis = __disable_irq ();
 156   *((void **)box) = ((P_BM) box_mem)->free;
 157   ((P_BM) box_mem)->free = box;
 158   if (!irq_dis) __enable_irq ();
 159 #else
 160   do {
 161     *((void **)box) = (void *)__ldrex(&((P_BM) box_mem)->free);
 162   } while (__strex ((U32)box, &((P_BM) box_mem)->free));
 163 #endif
 164   return (0);
 165 }
 166
 167 /*----------------------------------------------------------------------------
 168  * end of file
 169  *---------------------------------------------------------------------------*/
 170