pull/4/head
Richard Barry
19 years ago
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/*
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FreeRTOS.org V4.1.2 - Copyright (C) 2003-2006 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS.org, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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See http://www.FreeRTOS.org for documentation, latest information, license
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and contact details. Please ensure to read the configuration and relevant
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port sections of the online documentation.
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***************************************************************************
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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 portLONG ulDummy;
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unsigned portCHAR 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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