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jeremybenn |
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FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS books - available as PDF or paperback *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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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 exception 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 the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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* The simplest possible implementation of pvPortMalloc(). Note that this
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* implementation does NOT allow allocated memory to be freed again.
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*
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* See heap_2.c and heap_3.c for alternative implementations, and the memory
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* 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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#include "FreeRTOS.h"
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#include "task.h"
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/* Setup the correct byte alignment mask for the defined byte alignment. */
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#if portBYTE_ALIGNMENT == 4
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#define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0003 )
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#endif
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#if portBYTE_ALIGNMENT == 2
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#define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0001 )
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#endif
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#if portBYTE_ALIGNMENT == 1
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#define heapBYTE_ALIGNMENT_MASK ( ( size_t ) 0x0000 )
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#endif
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#ifndef heapBYTE_ALIGNMENT_MASK
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#error "Invalid portBYTE_ALIGNMENT definition"
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#endif
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/* Allocate the memory for the heap. The struct is used to force byte
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alignment without using any non-portable code. */
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extern struct xRTOS_HEAP
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{
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unsigned long ulDummy;
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unsigned char ucHeap[ configTOTAL_HEAP_SIZE ];
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} xHeap;
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static size_t xNextFreeByte = ( size_t ) 0;
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/*-----------------------------------------------------------*/
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void *pvPortMalloc( size_t xWantedSize )
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{
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void *pvReturn = NULL;
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/* Ensure that blocks are always aligned to the required number of bytes. */
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#if portBYTE_ALIGNMENT != 1
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if( xWantedSize & heapBYTE_ALIGNMENT_MASK )
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{
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/* Byte alignment required. */
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xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & heapBYTE_ALIGNMENT_MASK ) );
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}
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#endif
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vTaskSuspendAll();
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{
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/* Check there is enough room left for the allocation. */
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if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) &&
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( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
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{
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/* Return the next free byte then increment the index past this
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block. */
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pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] );
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xNextFreeByte += xWantedSize;
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}
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}
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xTaskResumeAll();
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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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/* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c
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for alternative implementations, and the memory management pages of
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http://www.FreeRTOS.org for more information. */
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( void ) pv;
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}
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/*-----------------------------------------------------------*/
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void vPortInitialiseBlocks( void )
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{
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/* Only required when static memory is not cleared. */
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xNextFreeByte = ( size_t ) 0;
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}
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