2 FreeRTOS V9.0.0rc2 - Copyright (C) 2016 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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13 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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72 * The simplest possible implementation of pvPortMalloc(). Note that this
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73 * implementation does NOT allow allocated memory to be freed again.
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75 * See heap_2.c, heap_3.c and heap_4.c for alternative implementations, and the
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76 * memory management pages of http://www.FreeRTOS.org for more information.
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80 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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81 all the API functions to use the MPU wrappers. That should only be done when
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82 task.h is included from an application file. */
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83 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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85 #include "FreeRTOS.h"
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88 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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90 #if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
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91 #error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
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94 /* A few bytes might be lost to byte aligning the heap start address. */
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95 #define configADJUSTED_HEAP_SIZE ( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
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97 /* Allocate the memory for the heap. */
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98 /* Allocate the memory for the heap. */
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99 #if( configAPPLICATION_ALLOCATED_HEAP == 1 )
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100 /* The application writer has already defined the array used for the RTOS
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101 heap - probably so it can be placed in a special segment or address. */
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102 extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
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104 static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
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105 #endif /* configAPPLICATION_ALLOCATED_HEAP */
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107 static size_t xNextFreeByte = ( size_t ) 0;
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109 /*-----------------------------------------------------------*/
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111 void *pvPortMalloc( size_t xWantedSize )
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113 void *pvReturn = NULL;
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114 static uint8_t *pucAlignedHeap = NULL;
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116 /* Ensure that blocks are always aligned to the required number of bytes. */
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117 #if( portBYTE_ALIGNMENT != 1 )
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119 if( xWantedSize & portBYTE_ALIGNMENT_MASK )
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121 /* Byte alignment required. */
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122 xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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129 if( pucAlignedHeap == NULL )
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131 /* Ensure the heap starts on a correctly aligned boundary. */
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132 pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) );
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135 /* Check there is enough room left for the allocation. */
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136 if( ( ( xNextFreeByte + xWantedSize ) < configADJUSTED_HEAP_SIZE ) &&
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137 ( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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139 /* Return the next free byte then increment the index past this
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141 pvReturn = pucAlignedHeap + xNextFreeByte;
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142 xNextFreeByte += xWantedSize;
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145 traceMALLOC( pvReturn, xWantedSize );
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147 ( void ) xTaskResumeAll();
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149 #if( configUSE_MALLOC_FAILED_HOOK == 1 )
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151 if( pvReturn == NULL )
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153 extern void vApplicationMallocFailedHook( void );
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154 vApplicationMallocFailedHook();
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161 /*-----------------------------------------------------------*/
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163 void vPortFree( void *pv )
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165 /* Memory cannot be freed using this scheme. See heap_2.c, heap_3.c and
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166 heap_4.c for alternative implementations, and the memory management pages of
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167 http://www.FreeRTOS.org for more information. */
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170 /* Force an assert as it is invalid to call this function. */
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171 configASSERT( pv == NULL );
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173 /*-----------------------------------------------------------*/
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175 void vPortInitialiseBlocks( void )
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177 /* Only required when static memory is not cleared. */
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178 xNextFreeByte = ( size_t ) 0;
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180 /*-----------------------------------------------------------*/
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182 size_t xPortGetFreeHeapSize( void )
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184 return ( configADJUSTED_HEAP_SIZE - xNextFreeByte );
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