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Support allocating stack from separate heap (#267)

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The change adds support for allocating task stacks from separate heap.
When configSTACK_ALLOCATION_FROM_SEPARATE_HEAP is defined as 1 in
FreeRTOSConfig.h, task stacks are allocated and freed using
pvPortMallocStack and vPortFreeStack functions. This allows the
application writer to provide a separate allocator for task stacks.

When configSTACK_ALLOCATION_FROM_SEPARATE_HEAP is defined as 0, task
stacks are allocated and freed using FreeRTOS heap functions
pvPortMalloc and vPortFree.

For backward compatibility, configSTACK_ALLOCATION_FROM_SEPARATE_HEAP
defaults to 0.

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>
This commit is contained in:
Gaurav-Aggarwal-AWS 2021-02-23 18:36:27 -08:00 committed by GitHub
parent 81f5892105
commit 2a604f4a28
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 19 additions and 5 deletions
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1
.github/lexicon.txt vendored
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@ -1617,6 +1617,7 @@ pvowner
pvparameter
pvparameters
pvportmalloc
pvportmallocstack
pvportrealloc
pvreg
pvrxdata

5
include/FreeRTOS.h
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@ -896,6 +896,11 @@
#define configSUPPORT_DYNAMIC_ALLOCATION 1
#endif
#ifndef configSTACK_ALLOCATION_FROM_SEPARATE_HEAP
/* Defaults to 0 for backward compatibility. */
#define configSTACK_ALLOCATION_FROM_SEPARATE_HEAP 0
#endif
#ifndef configSTACK_DEPTH_TYPE
/* Defaults to uint16_t for backward compatibility, but can be overridden

8
include/portable.h
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@ -179,6 +179,14 @@ void vPortInitialiseBlocks( void ) PRIVILEGED_FUNCTION;
size_t xPortGetFreeHeapSize( void ) PRIVILEGED_FUNCTION;
size_t xPortGetMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;
#if( configSTACK_ALLOCATION_FROM_SEPARATE_HEAP == 1 )
void *pvPortMallocStack( size_t xSize ) PRIVILEGED_FUNCTION;
void vPortFreeStack( void *pv ) PRIVILEGED_FUNCTION;
#else
#define pvPortMallocStack pvPortMalloc
#define vPortFreeStack vPortFree
#endif
/*
* Setup the hardware ready for the scheduler to take control. This generally
* sets up a tick interrupt and sets timers for the correct tick frequency.

10
tasks.c
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@ -748,7 +748,7 @@ static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
/* Allocate space for the stack used by the task being created.
* The base of the stack memory stored in the TCB so the task can
* be deleted later if required. */
pxNewTCB->pxStack = ( StackType_t * ) pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
pxNewTCB->pxStack = ( StackType_t * ) pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
if( pxNewTCB->pxStack == NULL )
{
@ -763,7 +763,7 @@ static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
StackType_t * pxStack;
/* Allocate space for the stack used by the task being created. */
pxStack = pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation is the stack. */
pxStack = pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation is the stack. */
if( pxStack != NULL )
{
@ -779,7 +779,7 @@ static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
{
/* The stack cannot be used as the TCB was not created. Free
* it again. */
vPortFree( pxStack );
vPortFreeStack( pxStack );
}
}
else
@ -3950,7 +3950,7 @@ static void prvCheckTasksWaitingTermination( void )
{
/* The task can only have been allocated dynamically - free both
* the stack and TCB. */
vPortFree( pxTCB->pxStack );
vPortFreeStack( pxTCB->pxStack );
vPortFree( pxTCB );
}
#elif ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
@ -3962,7 +3962,7 @@ static void prvCheckTasksWaitingTermination( void )
{
/* Both the stack and TCB were allocated dynamically, so both
* must be freed. */
vPortFree( pxTCB->pxStack );
vPortFreeStack( pxTCB->pxStack );
vPortFree( pxTCB );
}
else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )