FreeRTOS/Source/include/portable.h

/*
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    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.

	***************************************************************************
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    >>!   outside of the FreeRTOS kernel.                                   !<<
	***************************************************************************

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    ***************************************************************************
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*/

/*-----------------------------------------------------------
 * Portable layer API.  Each function must be defined for each port.
 *----------------------------------------------------------*/

#ifndef PORTABLE_H
#define PORTABLE_H

/* Each FreeRTOS port has a unique portmacro.h header file.  Originally a
pre-processor definition was used to ensure the pre-processor found the correct
portmacro.h file for the port being used.  That scheme was deprecated in favour
of setting the compiler's include path such that it found the correct
portmacro.h file - removing the need for the constant and allowing the
portmacro.h file to be located anywhere in relation to the port being used.
Purely for reasons of backward compatibility the old method is still valid, but
to make it clear that new projects should not use it, support for the port
specific constants has been moved into the deprecated_definitions.h header
file. */
#include "deprecated_definitions.h"

/* If portENTER_CRITICAL is not defined then including deprecated_definitions.h
did not result in a portmacro.h header file being included - and it should be
included here.  In this case the path to the correct portmacro.h header file
must be set in the compiler's include path. */
#ifndef portENTER_CRITICAL
	#include "portmacro.h"
#endif

#if portBYTE_ALIGNMENT == 8
	#define portBYTE_ALIGNMENT_MASK ( 0x0007U )
#endif

#if portBYTE_ALIGNMENT == 4
	#define portBYTE_ALIGNMENT_MASK	( 0x0003 )
#endif

#if portBYTE_ALIGNMENT == 2
	#define portBYTE_ALIGNMENT_MASK	( 0x0001 )
#endif

#if portBYTE_ALIGNMENT == 1
	#define portBYTE_ALIGNMENT_MASK	( 0x0000 )
#endif

#ifndef portBYTE_ALIGNMENT_MASK
	#error "Invalid portBYTE_ALIGNMENT definition"
#endif

#ifndef portNUM_CONFIGURABLE_REGIONS
	#define portNUM_CONFIGURABLE_REGIONS 1
#endif

#ifdef __cplusplus
extern "C" {
#endif

#include "mpu_wrappers.h"

/*
 * Setup the stack of a new task so it is ready to be placed under the
 * scheduler control.  The registers have to be placed on the stack in
 * the order that the port expects to find them.
 *
 */
#if( portUSING_MPU_WRAPPERS == 1 )
	StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters, BaseType_t xRunPrivileged ) PRIVILEGED_FUNCTION;
#else
	StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters ) PRIVILEGED_FUNCTION;
#endif

/* Used by heap_5.c. */
typedef struct HeapRegion
{
	uint8_t *pucStartAddress;
	size_t xSizeInBytes;
} HeapRegion_t;

/*
 * Used to define multiple heap regions for use by heap_5.c.  This function
 * must be called before any calls to pvPortMalloc() - not creating a task,
 * queue, semaphore, mutex, software timer, event group, etc. will result in
 * pvPortMalloc being called.
 *
 * pxHeapRegions passes in an array of HeapRegion_t structures - each of which
 * defines a region of memory that can be used as the heap.  The array is
 * terminated by a HeapRegions_t structure that has a size of 0.  The region
 * with the lowest start address must appear first in the array.
 */
void vPortDefineHeapRegions( const HeapRegion_t * const pxHeapRegions );


/*
 * Map to the memory management routines required for the port.
 */
void *pvPortMalloc( size_t xSize ) PRIVILEGED_FUNCTION;
void vPortFree( void *pv ) PRIVILEGED_FUNCTION;
void vPortInitialiseBlocks( void ) PRIVILEGED_FUNCTION;
size_t xPortGetFreeHeapSize( void ) PRIVILEGED_FUNCTION;
size_t xPortGetMinimumEverFreeHeapSize( void ) PRIVILEGED_FUNCTION;

/*
 * 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.
 */
BaseType_t xPortStartScheduler( void ) PRIVILEGED_FUNCTION;

/*
 * Undo any hardware/ISR setup that was performed by xPortStartScheduler() so
 * the hardware is left in its original condition after the scheduler stops
 * executing.
 */
void vPortEndScheduler( void ) PRIVILEGED_FUNCTION;

/*
 * The structures and methods of manipulating the MPU are contained within the
 * port layer.
 *
 * Fills the xMPUSettings structure with the memory region information
 * contained in xRegions.
 */
#if( portUSING_MPU_WRAPPERS == 1 )
	struct xMEMORY_REGION;
	void vPortStoreTaskMPUSettings( xMPU_SETTINGS *xMPUSettings, const struct xMEMORY_REGION * const xRegions, StackType_t *pxBottomOfStack, uint16_t usStackDepth ) PRIVILEGED_FUNCTION;
#endif

#ifdef __cplusplus
}
#endif

#endif /* PORTABLE_H */