/* | |
* FreeRTOS Kernel V10.0.1 | |
* 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. | |
* | |
* 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! | |
*/ | |
/* | |
* The simplest possible implementation of pvPortMalloc(). Note that this | |
* implementation does NOT allow allocated memory to be freed again. | |
* | |
* See heap_2.c and heap_3.c for alternative implementations, and the memory | |
* management pages of http://www.FreeRTOS.org for more information. | |
*/ | |
#include <stdlib.h> | |
#include "FreeRTOS.h" | |
#include "task.h" | |
/* Allocate the memory for the heap. The struct is used to force byte | |
alignment without using any non-portable code. */ | |
extern struct xRTOS_HEAP | |
{ | |
unsigned long ulDummy; | |
unsigned char ucHeap[ configTOTAL_HEAP_SIZE ]; | |
} xHeap; | |
static size_t xNextFreeByte = ( size_t ) 0; | |
/*-----------------------------------------------------------*/ | |
void *pvPortMalloc( size_t xWantedSize ) | |
{ | |
void *pvReturn = NULL; | |
/* Ensure that blocks are always aligned to the required number of bytes. */ | |
#if portBYTE_ALIGNMENT != 1 | |
if( xWantedSize & portBYTE_ALIGNMENT_MASK ) | |
{ | |
/* Byte alignment required. */ | |
xWantedSize += ( portBYTE_ALIGNMENT - ( xWantedSize & portBYTE_ALIGNMENT_MASK ) ); | |
} | |
#endif | |
vTaskSuspendAll(); | |
{ | |
/* Check there is enough room left for the allocation. */ | |
if( ( ( xNextFreeByte + xWantedSize ) < configTOTAL_HEAP_SIZE ) && | |
( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */ | |
{ | |
/* Return the next free byte then increment the index past this | |
block. */ | |
pvReturn = &( xHeap.ucHeap[ xNextFreeByte ] ); | |
xNextFreeByte += xWantedSize; | |
} | |
} | |
xTaskResumeAll(); | |
return pvReturn; | |
} | |
/*-----------------------------------------------------------*/ | |
void vPortFree( void *pv ) | |
{ | |
/* Memory cannot be freed using this scheme. See heap_2.c and heap_3.c | |
for alternative implementations, and the memory management pages of | |
http://www.FreeRTOS.org for more information. */ | |
( void ) pv; | |
} | |
/*-----------------------------------------------------------*/ | |
void vPortInitialiseBlocks( void ) | |
{ | |
/* Only required when static memory is not cleared. */ | |
xNextFreeByte = ( size_t ) 0; | |
} | |