2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 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 without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * The FreeRTOS eBook and reference manual are available to purchase for a *
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29 * small fee. Help yourself get started quickly while also helping the *
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30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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32 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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51 * The simplest possible implementation of pvPortMalloc(). Note that this
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52 * implementation does NOT allow allocated memory to be freed again.
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54 * See heap_2.c and heap_3.c for alternative implementations, and the memory
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55 * management pages of http://www.FreeRTOS.org for more information.
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59 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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60 all the API functions to use the MPU wrappers. That should only be done when
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61 task.h is included from an application file. */
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62 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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64 #include "FreeRTOS.h"
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67 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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69 /* Allocate the memory for the heap. The struct is used to force byte
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70 alignment without using any non-portable code. */
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71 static union xRTOS_HEAP
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73 #if portBYTE_ALIGNMENT == 8
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74 volatile portDOUBLE dDummy;
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76 volatile unsigned long ulDummy;
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78 unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
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81 static size_t xNextFreeByte = ( size_t ) 0;
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82 /*-----------------------------------------------------------*/
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84 void *pvPortMalloc( size_t xWantedSize )
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86 void *pvReturn = NULL;
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88 /* Ensure that blocks are always aligned to the required number of bytes. */
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89 #if portBYTE_ALIGNMENT != 1
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90 if( xWantedSize & portBYTE_ALIGNMENT_MASK )
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92 /* Byte alignment required. */
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93 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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99 /* Check there is enough room left for the allocation. */
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100 if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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101 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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103 /* Return the next free byte then increment the index past this
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105 pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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106 xNextFreeByte += xWantedSize;
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111 #if( configUSE_MALLOC_FAILED_HOOK == 1 )
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113 if( pvReturn == NULL )
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115 extern void vApplicationMallocFailedHook( void );
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116 vApplicationMallocFailedHook();
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123 /*-----------------------------------------------------------*/
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125 void vPortFree( void *pv )
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127 /* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c
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128 for alternative implementations, and the memory management pages of
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129 http://www.FreeRTOS.org for more information. */
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132 /*-----------------------------------------------------------*/
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134 void vPortInitialiseBlocks( void )
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136 /* Only required when static memory is not cleared. */
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137 xNextFreeByte = ( size_t ) 0;
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139 /*-----------------------------------------------------------*/
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141 size_t xPortGetFreeHeapSize( void )
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143 return ( configTOTAL_HEAP_SIZE - xNextFreeByte );
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