/*
 * 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
 *
 * 1 tab == 4 spaces!
 */

#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

/*-----------------------------------------------------------*/

/* 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 uint32_t ulPortYieldRequired;         \
                                                     \
        if( xSwitchRequired != pdFALSE )             \
        {                                            \
            ulPortYieldRequired = pdTRUE;            \
        }                                            \
    }

    #define portYIELD_FROM_ISR( x )    portEND_SWITCHING_ISR( x )
    #define portYIELD()                __asm volatile ( "SWI 0" ::: "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 );

/* These macros do not globally disable/enable interrupts.  They do mask off
 * interrupts that have a priority below configMAX_API_CALL_INTERRUPT_PRIORITY. */
    #define portENTER_CRITICAL()                      vPortEnterCritical();
    #define portEXIT_CRITICAL()                       vPortExitCritical();
    #define portDISABLE_INTERRUPTS()                  ulPortSetInterruptMask()
    #define portENABLE_INTERRUPTS()                   vPortClearInterruptMask( 0 )
    #define portSET_INTERRUPT_MASK_FROM_ISR()         ulPortSetInterruptMask()
    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( x )    vPortClearInterruptMask( x )

/*-----------------------------------------------------------*/

/* 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 )

/* 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 = ( 31 - __builtin_clz( uxReadyPriorities ) )

    #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */

    #ifdef configASSERT
        void vPortValidateInterruptPriority( void );
        #define portASSERT_IF_INTERRUPT_PRIORITY_INVALID()    vPortValidateInterruptPriority()
    #endif /* configASSERT */

    #define portNOP()                                         __asm volatile ( "NOP" )


    #ifdef __cplusplus
        } /* extern C */
    #endif


/* The number of bits to shift for an interrupt priority is dependent on the
 * number of bits implemented by the interrupt controller. */
    #if configUNIQUE_INTERRUPT_PRIORITIES == 16
        #define portPRIORITY_SHIFT            4
        #define portMAX_BINARY_POINT_VALUE    3
    #elif configUNIQUE_INTERRUPT_PRIORITIES == 32
        #define portPRIORITY_SHIFT            3
        #define portMAX_BINARY_POINT_VALUE    2
    #elif configUNIQUE_INTERRUPT_PRIORITIES == 64
        #define portPRIORITY_SHIFT            2
        #define portMAX_BINARY_POINT_VALUE    1
    #elif configUNIQUE_INTERRUPT_PRIORITIES == 128
        #define portPRIORITY_SHIFT            1
        #define portMAX_BINARY_POINT_VALUE    0
    #elif configUNIQUE_INTERRUPT_PRIORITIES == 256
        #define portPRIORITY_SHIFT            0
        #define portMAX_BINARY_POINT_VALUE    0
    #else /* if configUNIQUE_INTERRUPT_PRIORITIES == 16 */
        #error Invalid configUNIQUE_INTERRUPT_PRIORITIES setting.  configUNIQUE_INTERRUPT_PRIORITIES must be set to the number of unique priorities implemented by the target hardware
    #endif /* if configUNIQUE_INTERRUPT_PRIORITIES == 16 */

/* Interrupt controller access addresses. */
    #define portICCPMR_PRIORITY_MASK_OFFSET                      ( 0x04 )
    #define portICCIAR_INTERRUPT_ACKNOWLEDGE_OFFSET              ( 0x0C )
    #define portICCEOIR_END_OF_INTERRUPT_OFFSET                  ( 0x10 )
    #define portICCBPR_BINARY_POINT_OFFSET                       ( 0x08 )
    #define portICCRPR_RUNNING_PRIORITY_OFFSET                   ( 0x14 )

    #define portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS       ( configINTERRUPT_CONTROLLER_BASE_ADDRESS + configINTERRUPT_CONTROLLER_CPU_INTERFACE_OFFSET )
    #define portICCPMR_PRIORITY_MASK_REGISTER                    ( *( ( volatile uint32_t * ) ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCPMR_PRIORITY_MASK_OFFSET ) ) )
    #define portICCIAR_INTERRUPT_ACKNOWLEDGE_REGISTER_ADDRESS    ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCIAR_INTERRUPT_ACKNOWLEDGE_OFFSET )
    #define portICCEOIR_END_OF_INTERRUPT_REGISTER_ADDRESS        ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCEOIR_END_OF_INTERRUPT_OFFSET )
    #define portICCPMR_PRIORITY_MASK_REGISTER_ADDRESS            ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCPMR_PRIORITY_MASK_OFFSET )
    #define portICCBPR_BINARY_POINT_REGISTER                     ( *( ( const volatile uint32_t * ) ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCBPR_BINARY_POINT_OFFSET ) ) )
    #define portICCRPR_RUNNING_PRIORITY_REGISTER                 ( *( ( const volatile uint32_t * ) ( portINTERRUPT_CONTROLLER_CPU_INTERFACE_ADDRESS + portICCRPR_RUNNING_PRIORITY_OFFSET ) ) )

    #define portMEMORY_BARRIER()    __asm volatile ( "" ::: "memory" )

#endif /* PORTMACRO_H */