147 lines
4.7 KiB
C
147 lines
4.7 KiB
C
/*
|
|
* FreeRTOS Kernel V10.3.1
|
|
* Copyright (C) 2020 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, 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 )
|
|
|
|
/* 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 */
|
|
|
|
/* Index into the ucHeap array. */
|
|
static size_t xNextFreeByte = ( size_t ) 0;
|
|
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void *pvPortMalloc( size_t xWantedSize )
|
|
{
|
|
void *pvReturn = NULL;
|
|
static uint8_t *pucAlignedHeap = 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();
|
|
{
|
|
if( pucAlignedHeap == NULL )
|
|
{
|
|
/* Ensure the heap starts on a correctly aligned boundary. */
|
|
pucAlignedHeap = ( uint8_t * ) ( ( ( portPOINTER_SIZE_TYPE ) &ucHeap[ portBYTE_ALIGNMENT ] ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) );
|
|
}
|
|
|
|
/* Check there is enough room left for the allocation. */
|
|
if( ( ( xNextFreeByte + xWantedSize ) < configADJUSTED_HEAP_SIZE ) &&
|
|
( ( xNextFreeByte + xWantedSize ) > xNextFreeByte ) )/* Check for overflow. */
|
|
{
|
|
/* Return the next free byte then increment the index past this
|
|
block. */
|
|
pvReturn = pucAlignedHeap + xNextFreeByte;
|
|
xNextFreeByte += xWantedSize;
|
|
}
|
|
|
|
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 )
|
|
{
|
|
/* Memory cannot be freed using this scheme. See heap_2.c, heap_3.c and
|
|
heap_4.c for alternative implementations, and the memory management pages of
|
|
http://www.FreeRTOS.org for more information. */
|
|
( void ) pv;
|
|
|
|
/* Force an assert as it is invalid to call this function. */
|
|
configASSERT( pv == NULL );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vPortInitialiseBlocks( void )
|
|
{
|
|
/* Only required when static memory is not cleared. */
|
|
xNextFreeByte = ( size_t ) 0;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
size_t xPortGetFreeHeapSize( void )
|
|
{
|
|
return ( configADJUSTED_HEAP_SIZE - xNextFreeByte );
|
|
}
|
|
|
|
|
|
|