2 FreeRTOS.org V5.0.2 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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53 * The simplest possible implementation of pvPortMalloc(). Note that this
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54 * implementation does NOT allow allocated memory to be freed again.
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56 * See heap_2.c and heap_3.c for alternative implementations, and the memory
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57 * management pages of http://www.FreeRTOS.org for more information.
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60 #include "FreeRTOS.h"
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63 /* Setup the correct byte alignment mask for the defined byte alignment. */
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64 #if portBYTE_ALIGNMENT == 4
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65 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0003 )
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68 #if portBYTE_ALIGNMENT == 2
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69 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0001 )
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72 #if portBYTE_ALIGNMENT == 1
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73 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0000 )
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76 #ifndef heapBYTE_ALIGNMENT_MASK
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77 #error "Invalid portBYTE_ALIGNMENT definition"
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80 /* Allocate the memory for the heap. The struct is used to force byte
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81 alignment without using any non-portable code. */
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82 extern struct xRTOS_HEAP
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84 unsigned portLONG ulDummy;
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85 unsigned portCHAR ucHeap[ configTOTAL_HEAP_SIZE ];
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88 static size_t xNextFreeByte = ( size_t ) 0;
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89 /*-----------------------------------------------------------*/
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91 void *pvPortMalloc( size_t xWantedSize )
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93 void *pvReturn = NULL;
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95 /* Ensure that blocks are always aligned to the required number of bytes. */
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96 #if portBYTE_ALIGNMENT != 1
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97 if( xWantedSize & heapBYTE_ALIGNMENT_MASK )
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99 /* Byte alignment required. */
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100 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & heapBYTE_ALIGNMENT_MASK ) );
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106 /* Check there is enough room left for the allocation. */
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107 if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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108 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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110 /* Return the next free byte then increment the index past this
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112 pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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113 xNextFreeByte += xWantedSize;
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120 /*-----------------------------------------------------------*/
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122 void vPortFree( void *pv )
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124 /* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c
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125 for alternative implementations, and the memory management pages of
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126 http://www.FreeRTOS.org for more information. */
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129 /*-----------------------------------------------------------*/
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131 void vPortInitialiseBlocks( void )
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133 /* Only required when static memory is not cleared. */
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134 xNextFreeByte = ( size_t ) 0;
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