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- /*
- * FreeRTOS Kernel V10.0.0
- * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
- * this software and associated documentation files (the "Software"), to deal in
- * the Software without restriction, including without limitation the rights to
- * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
- * the Software, and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software. If you wish to use our Amazon
- * FreeRTOS name, please do so in a fair use way that does not cause confusion.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
- * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
- * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * http://www.FreeRTOS.org
- * http://aws.amazon.com/freertos
- *
- * 1 tab == 4 spaces!
- */
- /*
- * A sample implementation of pvPortMalloc() and vPortFree() that permits
- * allocated blocks to be freed, but does not combine adjacent free blocks
- * into a single larger block (and so will fragment memory). See heap_4.c for
- * an equivalent that does combine adjacent blocks into single larger blocks.
- *
- * See heap_1.c, heap_3.c and heap_4.c for alternative implementations, and the
- * memory management pages of http://www.FreeRTOS.org for more information.
- */
- #include <stdlib.h>
- /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
- all the API functions to use the MPU wrappers. That should only be done when
- task.h is included from an application file. */
- #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
- #include "FreeRTOS.h"
- #include "task.h"
- #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
- #if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
- #error This file must not be used if configSUPPORT_DYNAMIC_ALLOCATION is 0
- #endif
- /* A few bytes might be lost to byte aligning the heap start address. */
- #define configADJUSTED_HEAP_SIZE ( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
- /*
- * Initialises the heap structures before their first use.
- */
- static void prvHeapInit( void );
- /* Allocate the memory for the heap. */
- #if( configAPPLICATION_ALLOCATED_HEAP == 1 )
- /* The application writer has already defined the array used for the RTOS
- heap - probably so it can be placed in a special segment or address. */
- extern uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
- #else
- static uint8_t ucHeap[ configTOTAL_HEAP_SIZE ];
- #endif /* configAPPLICATION_ALLOCATED_HEAP */
- /* Define the linked list structure. This is used to link free blocks in order
- of their size. */
- typedef struct A_BLOCK_LINK
- {
- struct A_BLOCK_LINK *pxNextFreeBlock; /*<< The next free block in the list. */
- size_t xBlockSize; /*<< The size of the free block. */
- } BlockLink_t;
- static const uint16_t heapSTRUCT_SIZE = ( ( sizeof ( BlockLink_t ) + ( portBYTE_ALIGNMENT - 1 ) ) & ~portBYTE_ALIGNMENT_MASK );
- #define heapMINIMUM_BLOCK_SIZE ( ( size_t ) ( heapSTRUCT_SIZE * 2 ) )
- /* Create a couple of list links to mark the start and end of the list. */
- static BlockLink_t xStart, xEnd;
- /* Keeps track of the number of free bytes remaining, but says nothing about
- fragmentation. */
- static size_t xFreeBytesRemaining = configADJUSTED_HEAP_SIZE;
- /* STATIC FUNCTIONS ARE DEFINED AS MACROS TO MINIMIZE THE FUNCTION CALL DEPTH. */
- /*
- * Insert a block into the list of free blocks - which is ordered by size of
- * the block. Small blocks at the start of the list and large blocks at the end
- * of the list.
- */
- #define prvInsertBlockIntoFreeList( pxBlockToInsert ) \
- { \
- BlockLink_t *pxIterator; \
- size_t xBlockSize; \
- \
- xBlockSize = pxBlockToInsert->xBlockSize; \
- \
- /* Iterate through the list until a block is found that has a larger size */ \
- /* than the block we are inserting. */ \
- for( pxIterator = &xStart; pxIterator->pxNextFreeBlock->xBlockSize < xBlockSize; pxIterator = pxIterator->pxNextFreeBlock ) \
- { \
- /* There is nothing to do here - just iterate to the correct position. */ \
- } \
- \
- /* Update the list to include the block being inserted in the correct */ \
- /* position. */ \
- pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock; \
- pxIterator->pxNextFreeBlock = pxBlockToInsert; \
- }
- /*-----------------------------------------------------------*/
- void *pvPortMalloc( size_t xWantedSize )
- {
- BlockLink_t *pxBlock, *pxPreviousBlock, *pxNewBlockLink;
- static BaseType_t xHeapHasBeenInitialised = pdFALSE;
- void *pvReturn = NULL;
- vTaskSuspendAll();
- {
- /* If this is the first call to malloc then the heap will require
- initialisation to setup the list of free blocks. */
- if( xHeapHasBeenInitialised == pdFALSE )
- {
- prvHeapInit();
- xHeapHasBeenInitialised = pdTRUE;
- }
- /* The wanted size is increased so it can contain a BlockLink_t
- structure in addition to the requested amount of bytes. */
- if( xWantedSize > 0 )
- {
- xWantedSize += heapSTRUCT_SIZE;
- /* Ensure that blocks are always aligned to the required number of bytes. */
- if( ( xWantedSize & portBYTE_ALIGNMENT_MASK ) != 0 )
- {
- /* Byte alignment required. */
- xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
- }
- }
- if( ( xWantedSize > 0 ) && ( xWantedSize < configADJUSTED_HEAP_SIZE ) )
- {
- /* Blocks are stored in byte order - traverse the list from the start
- (smallest) block until one of adequate size is found. */
- pxPreviousBlock = &xStart;
- pxBlock = xStart.pxNextFreeBlock;
- while( ( pxBlock->xBlockSize < xWantedSize ) && ( pxBlock->pxNextFreeBlock != NULL ) )
- {
- pxPreviousBlock = pxBlock;
- pxBlock = pxBlock->pxNextFreeBlock;
- }
- /* If we found the end marker then a block of adequate size was not found. */
- if( pxBlock != &xEnd )
- {
- /* Return the memory space - jumping over the BlockLink_t structure
- at its start. */
- pvReturn = ( void * ) ( ( ( uint8_t * ) pxPreviousBlock->pxNextFreeBlock ) + heapSTRUCT_SIZE );
- /* This block is being returned for use so must be taken out of the
- list of free blocks. */
- pxPreviousBlock->pxNextFreeBlock = pxBlock->pxNextFreeBlock;
- /* If the block is larger than required it can be split into two. */
- if( ( pxBlock->xBlockSize - xWantedSize ) > heapMINIMUM_BLOCK_SIZE )
- {
- /* This block is to be split into two. Create a new block
- following the number of bytes requested. The void cast is
- used to prevent byte alignment warnings from the compiler. */
- pxNewBlockLink = ( void * ) ( ( ( uint8_t * ) pxBlock ) + xWantedSize );
- /* Calculate the sizes of two blocks split from the single
- block. */
- pxNewBlockLink->xBlockSize = pxBlock->xBlockSize - xWantedSize;
- pxBlock->xBlockSize = xWantedSize;
- /* Insert the new block into the list of free blocks. */
- prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
- }
- xFreeBytesRemaining -= pxBlock->xBlockSize;
- }
- }
- traceMALLOC( pvReturn, xWantedSize );
- }
- ( void ) xTaskResumeAll();
- #if( configUSE_MALLOC_FAILED_HOOK == 1 )
- {
- if( pvReturn == NULL )
- {
- extern void vApplicationMallocFailedHook( void );
- vApplicationMallocFailedHook();
- }
- }
- #endif
- return pvReturn;
- }
- /*-----------------------------------------------------------*/
- void vPortFree( void *pv )
- {
- uint8_t *puc = ( uint8_t * ) pv;
- BlockLink_t *pxLink;
- if( pv != NULL )
- {
- /* The memory being freed will have an BlockLink_t structure immediately
- before it. */
- puc -= heapSTRUCT_SIZE;
- /* This unexpected casting is to keep some compilers from issuing
- byte alignment warnings. */
- pxLink = ( void * ) puc;
- vTaskSuspendAll();
- {
- /* Add this block to the list of free blocks. */
- prvInsertBlockIntoFreeList( ( ( BlockLink_t * ) pxLink ) );
- xFreeBytesRemaining += pxLink->xBlockSize;
- traceFREE( pv, pxLink->xBlockSize );
- }
- ( void ) xTaskResumeAll();
- }
- }
- /*-----------------------------------------------------------*/
- size_t xPortGetFreeHeapSize( void )
- {
- return xFreeBytesRemaining;
- }
- /*-----------------------------------------------------------*/
- void vPortInitialiseBlocks( void )
- {
- /* This just exists to keep the linker quiet. */
- }
- /*-----------------------------------------------------------*/
- static void prvHeapInit( void )
- {
- BlockLink_t *pxFirstFreeBlock;
- uint8_t *pucAlignedHeap;
- /* Ensure the heap starts on a correctly aligned boundary. */
- pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) );
- /* xStart is used to hold a pointer to the first item in the list of free
- blocks. The void cast is used to prevent compiler warnings. */
- xStart.pxNextFreeBlock = ( void * ) pucAlignedHeap;
- xStart.xBlockSize = ( size_t ) 0;
- /* xEnd is used to mark the end of the list of free blocks. */
- xEnd.xBlockSize = configADJUSTED_HEAP_SIZE;
- xEnd.pxNextFreeBlock = NULL;
- /* To start with there is a single free block that is sized to take up the
- entire heap space. */
- pxFirstFreeBlock = ( void * ) pucAlignedHeap;
- pxFirstFreeBlock->xBlockSize = configADJUSTED_HEAP_SIZE;
- pxFirstFreeBlock->pxNextFreeBlock = &xEnd;
- }
- /*-----------------------------------------------------------*/
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