2 FreeRTOS.org V5.3.1 - Copyright (C) 2003-2009 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 it
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7 under the terms of the GNU General Public License (version 2) as published
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8 by the Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS.org without being obliged to provide
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11 the source code for any proprietary components. Alternative commercial
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12 license and support terms are also available upon request. See the
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13 licensing section of http://www.FreeRTOS.org for full details.
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15 FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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20 You should have received a copy of the GNU General Public License along
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21 with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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22 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ***************************************************************************
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27 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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29 * This is a concise, step by step, 'hands on' guide that describes both *
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30 * general multitasking concepts and FreeRTOS specifics. It presents and *
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31 * explains numerous examples that are written using the FreeRTOS API. *
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32 * Full source code for all the examples is provided in an accompanying *
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35 ***************************************************************************
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39 Please ensure to read the configuration and relevant port sections of the
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40 online documentation.
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42 http://www.FreeRTOS.org - Documentation, latest information, license and
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45 http://www.SafeRTOS.com - A version that is certified for use in safety
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48 http://www.OpenRTOS.com - Commercial support, development, porting,
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49 licensing and training services.
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54 * The simplest possible implementation of pvPortMalloc(). Note that this
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55 * implementation does NOT allow allocated memory to be freed again.
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57 * See heap_2.c and heap_3.c for alternative implementations, and the memory
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58 * management pages of http://www.FreeRTOS.org for more information.
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61 #include "FreeRTOS.h"
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64 /* Setup the correct byte alignment mask for the defined byte alignment. */
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66 #if portBYTE_ALIGNMENT == 8
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67 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0007 )
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70 #if portBYTE_ALIGNMENT == 4
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71 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0003 )
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74 #if portBYTE_ALIGNMENT == 2
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75 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0001 )
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78 #if portBYTE_ALIGNMENT == 1
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79 #define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0000 )
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82 #ifndef heapBYTE_ALIGNMENT_MASK
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83 #error "Invalid portBYTE_ALIGNMENT definition"
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86 /* Allocate the memory for the heap. The struct is used to force byte
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87 alignment without using any non-portable code. */
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88 static union xRTOS_HEAP
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90 #if portBYTE_ALIGNMENT == 8
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91 volatile portDOUBLE dDummy;
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93 volatile unsigned portLONG ulDummy;
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95 unsigned portCHAR ucHeap[ configTOTAL_HEAP_SIZE ];
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98 static size_t xNextFreeByte = ( size_t ) 0;
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99 /*-----------------------------------------------------------*/
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101 void *pvPortMalloc( size_t xWantedSize )
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103 void *pvReturn = NULL;
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105 /* Ensure that blocks are always aligned to the required number of bytes. */
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106 #if portBYTE_ALIGNMENT != 1
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107 if( xWantedSize & heapBYTE_ALIGNMENT_MASK )
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109 /* Byte alignment required. */
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110 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & heapBYTE_ALIGNMENT_MASK ) );
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116 /* Check there is enough room left for the allocation. */
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117 if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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118 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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120 /* Return the next free byte then increment the index past this
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122 pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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123 xNextFreeByte += xWantedSize;
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130 /*-----------------------------------------------------------*/
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132 void vPortFree( void *pv )
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134 /* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c
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135 for alternative implementations, and the memory management pages of
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136 http://www.FreeRTOS.org for more information. */
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139 /*-----------------------------------------------------------*/
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141 void vPortInitialiseBlocks( void )
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143 /* Only required when static memory is not cleared. */
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144 xNextFreeByte = ( size_t ) 0;
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