/*
 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
 * 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.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */

#ifndef PORTMACRO_H
#define PORTMACRO_H

#ifdef __cplusplus
	extern "C" {
#endif

/*-----------------------------------------------------------
 * Port specific definitions.
 *
 * The settings in this file configure FreeRTOS correctly for the given hardware
 * and compiler.
 *
 * These settings should not be altered.
 *-----------------------------------------------------------
 */

/* Type definitions. */
#define portCHAR		char
#define portFLOAT		float
#define portDOUBLE		double
#define portLONG		long
#define portSHORT		short
#define portSTACK_TYPE	uint32_t
#define portBASE_TYPE	long

typedef portSTACK_TYPE StackType_t;
typedef long BaseType_t;
typedef unsigned long UBaseType_t;

typedef uint32_t TickType_t;
#define portMAX_DELAY ( TickType_t ) 0xffffffffUL

/* 32-bit tick type on a 32-bit architecture, so reads of the tick count do
not need to be guarded with a critical section. */
#define portTICK_TYPE_IS_ATOMIC 1

/*-----------------------------------------------------------*/

/* Hardware specifics. */
#define portSTACK_GROWTH			( -1 )
#define portTICK_PERIOD_MS			( ( TickType_t ) 1000 / configTICK_RATE_HZ )
#define portBYTE_ALIGNMENT			8

/*-----------------------------------------------------------*/

/* Task utilities. */

/* Called at the end of an ISR that can cause a context switch. */
#define portEND_SWITCHING_ISR( xSwitchRequired )\
{												\
extern volatile uint32_t ulPortYieldRequired;	\
												\
	if( xSwitchRequired != pdFALSE )			\
	{											\
		ulPortYieldRequired = pdTRUE;			\
	}											\
}

#define portYIELD_FROM_ISR( x ) portEND_SWITCHING_ISR( x )
#define portYIELD() __asm volatile ( "SWI 0		\n"				\
									 "ISB		  " ::: "memory" );


/*-----------------------------------------------------------
 * Critical section control
 *----------------------------------------------------------*/

extern void vPortEnterCritical( void );
extern void vPortExitCritical( void );
extern uint32_t ulPortSetInterruptMask( void );
extern void vPortClearInterruptMask( uint32_t ulNewMaskValue );
extern void vPortInstallFreeRTOSVectorTable( void );

/* The I bit within the CPSR. */
#define portINTERRUPT_ENABLE_BIT	( 1 << 7 )

/* In the absence of a priority mask register, these functions and macros
globally enable and disable interrupts. */
#define portENTER_CRITICAL()		vPortEnterCritical();
#define portEXIT_CRITICAL()			vPortExitCritical();
#define portENABLE_INTERRUPTS()		__asm volatile ( "CPSIE i 	\n"	::: "memory" );
#define portDISABLE_INTERRUPTS()	__asm volatile ( "CPSID i 	\n"		\
													 "DSB		\n"		\
													 "ISB		  " ::: "memory" );

__attribute__( ( always_inline ) ) static __inline uint32_t portINLINE_SET_INTERRUPT_MASK_FROM_ISR( void )
{
volatile uint32_t ulCPSR;

	__asm volatile ( "MRS %0, CPSR" : "=r" (ulCPSR) :: "memory" );
	ulCPSR &= portINTERRUPT_ENABLE_BIT;
	portDISABLE_INTERRUPTS();
	return ulCPSR;
}

#define portSET_INTERRUPT_MASK_FROM_ISR() portINLINE_SET_INTERRUPT_MASK_FROM_ISR()
#define portCLEAR_INTERRUPT_MASK_FROM_ISR(x)	do { if( x == 0 ) portENABLE_INTERRUPTS(); } while( 0 )

/*-----------------------------------------------------------*/

/* Task function macros as described on the FreeRTOS.org WEB site.  These are
not required for this port but included in case common demo code that uses these
macros is used. */
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters )	void vFunction( void *pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters )	void vFunction( void *pvParameters )

/* Tickless idle/low power functionality. */
#ifndef portSUPPRESS_TICKS_AND_SLEEP
	extern void vPortSuppressTicksAndSleep( TickType_t xExpectedIdleTime );
	#define portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime ) vPortSuppressTicksAndSleep( xExpectedIdleTime )
#endif

/* Prototype of the FreeRTOS tick handler.  This must be installed as the
handler for whichever peripheral is used to generate the RTOS tick. */
void FreeRTOS_Tick_Handler( void );

/* Any task that uses the floating point unit MUST call vPortTaskUsesFPU()
before any floating point instructions are executed. */
void vPortTaskUsesFPU( void );
#define portTASK_USES_FLOATING_POINT() vPortTaskUsesFPU()

#define portLOWEST_INTERRUPT_PRIORITY ( ( ( uint32_t ) configUNIQUE_INTERRUPT_PRIORITIES ) - 1UL )
#define portLOWEST_USABLE_INTERRUPT_PRIORITY ( portLOWEST_INTERRUPT_PRIORITY - 1UL )

/* Architecture specific optimisations. */
#ifndef configUSE_PORT_OPTIMISED_TASK_SELECTION
	#define configUSE_PORT_OPTIMISED_TASK_SELECTION 1
#endif

#if configUSE_PORT_OPTIMISED_TASK_SELECTION == 1

	/* Store/clear the ready priorities in a bit map. */
	#define portRECORD_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) |= ( 1UL << ( uxPriority ) )
	#define portRESET_READY_PRIORITY( uxPriority, uxReadyPriorities ) ( uxReadyPriorities ) &= ~( 1UL << ( uxPriority ) )

	/*-----------------------------------------------------------*/

	#define portGET_HIGHEST_PRIORITY( uxTopPriority, uxReadyPriorities ) uxTopPriority = ( 31UL - ( uint32_t ) __builtin_clz( uxReadyPriorities ) )

#endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */

#define portNOP() __asm volatile( "NOP" )
#define portINLINE __inline

#define portMEMORY_BARRIER() __asm volatile( "" ::: "memory" )

#ifdef __cplusplus
	} /* extern C */
#endif


#endif /* PORTMACRO_H */