295 lines
11 KiB
C
295 lines
11 KiB
C
/*
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FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd.
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to distribute
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>>! a combined work that includes FreeRTOS without being obliged to provide
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>>! the source code for proprietary components outside of the FreeRTOS
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>>! kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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/*
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* A sample implementation of pvPortMalloc() and vPortFree() that permits
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* allocated blocks to be freed, but does not combine adjacent free blocks
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* into a single larger block (and so will fragment memory). See heap_4.c for
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* an equivalent that does combine adjacent blocks into single larger blocks.
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*
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* See heap_1.c, heap_3.c and heap_4.c for alternative implementations, and the
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* memory management pages of http://www.FreeRTOS.org for more information.
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*/
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#include <stdlib.h>
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/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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all the API functions to use the MPU wrappers. That should only be done when
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task.h is included from an application file. */
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#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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#include "FreeRTOS.h"
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#include "task.h"
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#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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/* A few bytes might be lost to byte aligning the heap start address. */
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#define configADJUSTED_HEAP_SIZE ( configTOTAL_HEAP_SIZE - portBYTE_ALIGNMENT )
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/*
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* Initialises the heap structures before their first use.
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*/
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static void prvHeapInit( void );
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/* Allocate the memory for the heap. */
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static unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
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/* Define the linked list structure. This is used to link free blocks in order
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of their size. */
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typedef struct A_BLOCK_LINK
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{
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struct A_BLOCK_LINK *pxNextFreeBlock; /*<< The next free block in the list. */
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size_t xBlockSize; /*<< The size of the free block. */
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} xBlockLink;
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static const unsigned short heapSTRUCT_SIZE = ( ( sizeof ( xBlockLink ) + ( portBYTE_ALIGNMENT - 1 ) ) & ~portBYTE_ALIGNMENT_MASK );
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#define heapMINIMUM_BLOCK_SIZE ( ( size_t ) ( heapSTRUCT_SIZE * 2 ) )
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/* Create a couple of list links to mark the start and end of the list. */
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static xBlockLink xStart, xEnd;
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/* Keeps track of the number of free bytes remaining, but says nothing about
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fragmentation. */
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static size_t xFreeBytesRemaining = configADJUSTED_HEAP_SIZE;
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/* STATIC FUNCTIONS ARE DEFINED AS MACROS TO MINIMIZE THE FUNCTION CALL DEPTH. */
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/*
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* Insert a block into the list of free blocks - which is ordered by size of
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* the block. Small blocks at the start of the list and large blocks at the end
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* of the list.
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*/
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#define prvInsertBlockIntoFreeList( pxBlockToInsert ) \
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{ \
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xBlockLink *pxIterator; \
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size_t xBlockSize; \
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\
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xBlockSize = pxBlockToInsert->xBlockSize; \
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\
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/* Iterate through the list until a block is found that has a larger size */ \
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/* than the block we are inserting. */ \
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for( pxIterator = &xStart; pxIterator->pxNextFreeBlock->xBlockSize < xBlockSize; pxIterator = pxIterator->pxNextFreeBlock ) \
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{ \
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/* There is nothing to do here - just iterate to the correct position. */ \
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} \
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\
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/* Update the list to include the block being inserted in the correct */ \
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/* position. */ \
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pxBlockToInsert->pxNextFreeBlock = pxIterator->pxNextFreeBlock; \
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pxIterator->pxNextFreeBlock = pxBlockToInsert; \
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}
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/*-----------------------------------------------------------*/
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void *pvPortMalloc( size_t xWantedSize )
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{
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xBlockLink *pxBlock, *pxPreviousBlock, *pxNewBlockLink;
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static portBASE_TYPE xHeapHasBeenInitialised = pdFALSE;
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void *pvReturn = NULL;
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vTaskSuspendAll();
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{
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/* If this is the first call to malloc then the heap will require
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initialisation to setup the list of free blocks. */
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if( xHeapHasBeenInitialised == pdFALSE )
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{
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prvHeapInit();
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xHeapHasBeenInitialised = pdTRUE;
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}
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/* The wanted size is increased so it can contain a xBlockLink
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structure in addition to the requested amount of bytes. */
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if( xWantedSize > 0 )
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{
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xWantedSize += heapSTRUCT_SIZE;
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/* Ensure that blocks are always aligned to the required number of bytes. */
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if( ( xWantedSize & portBYTE_ALIGNMENT_MASK ) != 0 )
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{
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/* Byte alignment required. */
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xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) );
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}
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}
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if( ( xWantedSize > 0 ) && ( xWantedSize < configADJUSTED_HEAP_SIZE ) )
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{
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/* Blocks are stored in byte order - traverse the list from the start
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(smallest) block until one of adequate size is found. */
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pxPreviousBlock = &xStart;
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pxBlock = xStart.pxNextFreeBlock;
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while( ( pxBlock->xBlockSize < xWantedSize ) && ( pxBlock->pxNextFreeBlock != NULL ) )
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{
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pxPreviousBlock = pxBlock;
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pxBlock = pxBlock->pxNextFreeBlock;
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}
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/* If we found the end marker then a block of adequate size was not found. */
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if( pxBlock != &xEnd )
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{
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/* Return the memory space - jumping over the xBlockLink structure
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at its start. */
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pvReturn = ( void * ) ( ( ( unsigned char * ) pxPreviousBlock->pxNextFreeBlock ) + heapSTRUCT_SIZE );
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/* This block is being returned for use so must be taken out of the
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list of free blocks. */
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pxPreviousBlock->pxNextFreeBlock = pxBlock->pxNextFreeBlock;
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/* If the block is larger than required it can be split into two. */
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if( ( pxBlock->xBlockSize - xWantedSize ) > heapMINIMUM_BLOCK_SIZE )
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{
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/* This block is to be split into two. Create a new block
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following the number of bytes requested. The void cast is
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used to prevent byte alignment warnings from the compiler. */
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pxNewBlockLink = ( void * ) ( ( ( unsigned char * ) pxBlock ) + xWantedSize );
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/* Calculate the sizes of two blocks split from the single
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block. */
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pxNewBlockLink->xBlockSize = pxBlock->xBlockSize - xWantedSize;
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pxBlock->xBlockSize = xWantedSize;
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/* Insert the new block into the list of free blocks. */
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prvInsertBlockIntoFreeList( ( pxNewBlockLink ) );
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}
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xFreeBytesRemaining -= pxBlock->xBlockSize;
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}
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}
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}
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xTaskResumeAll();
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#if( configUSE_MALLOC_FAILED_HOOK == 1 )
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{
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if( pvReturn == NULL )
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{
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extern void vApplicationMallocFailedHook( void );
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vApplicationMallocFailedHook();
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}
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}
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#endif
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return pvReturn;
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}
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/*-----------------------------------------------------------*/
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void vPortFree( void *pv )
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{
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unsigned char *puc = ( unsigned char * ) pv;
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xBlockLink *pxLink;
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if( pv != NULL )
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{
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/* The memory being freed will have an xBlockLink structure immediately
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before it. */
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puc -= heapSTRUCT_SIZE;
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/* This unexpected casting is to keep some compilers from issuing
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byte alignment warnings. */
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pxLink = ( void * ) puc;
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vTaskSuspendAll();
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{
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/* Add this block to the list of free blocks. */
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prvInsertBlockIntoFreeList( ( ( xBlockLink * ) pxLink ) );
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xFreeBytesRemaining += pxLink->xBlockSize;
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}
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xTaskResumeAll();
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}
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}
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/*-----------------------------------------------------------*/
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size_t xPortGetFreeHeapSize( void )
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{
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return xFreeBytesRemaining;
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}
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/*-----------------------------------------------------------*/
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void vPortInitialiseBlocks( void )
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{
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/* This just exists to keep the linker quiet. */
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}
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/*-----------------------------------------------------------*/
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static void prvHeapInit( void )
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{
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xBlockLink *pxFirstFreeBlock;
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unsigned char *pucAlignedHeap;
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/* Ensure the heap starts on a correctly aligned boundary. */
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pucAlignedHeap = ( unsigned char * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ( portPOINTER_SIZE_TYPE ) ~portBYTE_ALIGNMENT_MASK ) );
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/* xStart is used to hold a pointer to the first item in the list of free
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blocks. The void cast is used to prevent compiler warnings. */
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xStart.pxNextFreeBlock = ( void * ) pucAlignedHeap;
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xStart.xBlockSize = ( size_t ) 0;
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/* xEnd is used to mark the end of the list of free blocks. */
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xEnd.xBlockSize = configADJUSTED_HEAP_SIZE;
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xEnd.pxNextFreeBlock = NULL;
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/* To start with there is a single free block that is sized to take up the
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entire heap space. */
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pxFirstFreeBlock = ( void * ) pucAlignedHeap;
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pxFirstFreeBlock->xBlockSize = configADJUSTED_HEAP_SIZE;
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pxFirstFreeBlock->pxNextFreeBlock = &xEnd;
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}
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/*-----------------------------------------------------------*/
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