/*
 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
 * Copyright (C) 2015-2019 Cadence Design Systems, Inc.
 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * SPDX-License-Identifier: MIT
 *
 * 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

/* *INDENT-OFF* */
#ifdef __cplusplus
    extern "C" {
#endif
/* *INDENT-ON* */

#ifndef __ASSEMBLER__

    #include <stdint.h>

    #include <xtensa/tie/xt_core.h>
    #include <xtensa/hal.h>
    #include <xtensa/config/core.h>
    #include <xtensa/config/system.h> /* required for XSHAL_CLIB */
    #include <xtensa/xtruntime.h>

/*#include "xtensa_context.h" */

/*-----------------------------------------------------------
 * 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          int8_t
    #define portFLOAT         float
    #define portDOUBLE        double
    #define portLONG          int32_t
    #define portSHORT         int16_t
    #define portSTACK_TYPE    uint32_t
    #define portBASE_TYPE     int

    typedef portSTACK_TYPE           StackType_t;
    typedef portBASE_TYPE            BaseType_t;
    typedef unsigned portBASE_TYPE   UBaseType_t;

    #if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
        typedef uint16_t             TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffff
    #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
        typedef uint32_t             TickType_t;
        #define portMAX_DELAY    ( TickType_t ) 0xffffffffUL
    #else
        #error configTICK_TYPE_WIDTH_IN_BITS set to unsupported tick type width.
    #endif
/*-----------------------------------------------------------*/

/* portbenchmark */
    #include "portbenchmark.h"

/* Critical section management. NW-TODO: replace XTOS_SET_INTLEVEL with more efficient version, if any? */
/* These cannot be nested. They should be used with a lot of care and cannot be called from interrupt level. */
    #define portDISABLE_INTERRUPTS()    do { XTOS_SET_INTLEVEL( XCHAL_EXCM_LEVEL ); portbenchmarkINTERRUPT_DISABLE(); } while( 0 )
    #define portENABLE_INTERRUPTS()     do { portbenchmarkINTERRUPT_RESTORE( 0 ); XTOS_SET_INTLEVEL( 0 ); } while( 0 )

/* These can be nested */
    #define portCRITICAL_NESTING_IN_TCB    1 /* For now, let FreeRTOS' (tasks.c) manage critical nesting */
    void vTaskEnterCritical( void );
    void vTaskExitCritical( void );
    #define portENTER_CRITICAL()    vTaskEnterCritical()
    #define portEXIT_CRITICAL()     vTaskExitCritical()

/* Cleaner and preferred solution allows nested interrupts disabling and restoring via local registers or stack. */
/* They can be called from interrupts too. */
    static inline unsigned portENTER_CRITICAL_NESTED()
    {
        unsigned state = XTOS_SET_INTLEVEL( XCHAL_EXCM_LEVEL );

        portbenchmarkINTERRUPT_DISABLE();
        return state;
    }
    #define portEXIT_CRITICAL_NESTED( state )             do { portbenchmarkINTERRUPT_RESTORE( state ); XTOS_RESTORE_JUST_INTLEVEL( state ); } while( 0 )

/* These FreeRTOS versions are similar to the nested versions above */
    #define portSET_INTERRUPT_MASK_FROM_ISR()             portENTER_CRITICAL_NESTED()
    #define portCLEAR_INTERRUPT_MASK_FROM_ISR( state )    portEXIT_CRITICAL_NESTED( state )

/*-----------------------------------------------------------*/

/* Architecture specifics. */
    #define portSTACK_GROWTH      ( -1 )
    #define portTICK_PERIOD_MS    ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
    #define portBYTE_ALIGNMENT    4
    #define portNOP()    XT_NOP()
/*-----------------------------------------------------------*/

/* Fine resolution time */
    #define portGET_RUN_TIME_COUNTER_VALUE()    xthal_get_ccount()

/* Kernel utilities. */
    void vPortYield( void );
    void _frxt_setup_switch( void );
    #define portYIELD()    vPortYield()
    #define portYIELD_FROM_ISR( xHigherPriorityTaskWoken ) \
    if( ( xHigherPriorityTaskWoken ) != 0 ) {              \
        _frxt_setup_switch();                              \
    }

/*-----------------------------------------------------------*/

/* Task function macros as described on the FreeRTOS.org WEB site. */
    #define portTASK_FUNCTION_PROTO( vFunction, pvParameters )    void vFunction( void * pvParameters )
    #define portTASK_FUNCTION( vFunction, pvParameters )          void vFunction( void * pvParameters )

/* When coprocessors are defined, we to maintain a pointer to coprocessors area. */
/* We currently use a hack: redefine field xMPU_SETTINGS in TCB block as a structure that can hold: */
/* MPU wrappers, coprocessor area pointer, trace code structure, and more if needed. */
/* The field is normally used for memory protection. FreeRTOS should create another general purpose field. */
    typedef struct
    {
        #if XCHAL_CP_NUM > 0
            volatile StackType_t * coproc_area; /* Pointer to coprocessor save area; MUST BE FIRST */
        #endif

        #if portUSING_MPU_WRAPPERS
            /* Define here mpu_settings, which is port dependent */
            int mpu_setting; /* Just a dummy example here; MPU not ported to Xtensa yet */
        #endif

        #if configUSE_TRACE_FACILITY_2
            struct
            {
                /* Cf. porttraceStamp() */
                int taskstamp;      /* Stamp from inside task to see where we are */
                int taskstampcount; /* A counter usually incremented when we restart the task's loop */
            } porttrace;
        #endif
    } xMPU_SETTINGS;

/* Main hack to use MPU_wrappers even when no MPU is defined (warning: mpu_setting should not be accessed; otherwise move this above xMPU_SETTINGS) */
    #if ( XCHAL_CP_NUM > 0 || configUSE_TRACE_FACILITY_2 ) && !portUSING_MPU_WRAPPERS /* If MPU wrappers not used, we still need to allocate coproc area */
        #undef portUSING_MPU_WRAPPERS
        #define portUSING_MPU_WRAPPERS    1                                           /* Enable it to allocate coproc area */
        #define MPU_WRAPPERS_H                                                        /* Override mpu_wrapper.h to disable unwanted code */
        #define PRIVILEGED_FUNCTION
        #define PRIVILEGED_DATA
    #endif

/* porttrace */
    #if configUSE_TRACE_FACILITY_2
        #include "porttrace.h"
    #endif

/* configASSERT_2 if requested */
    #if configASSERT_2
        #include <stdio.h>
        void exit( int );
        #define configASSERT( x )    if( !( x ) ) { porttracePrint( -1 ); printf( "\nAssertion failed in %s:%d\n", __FILE__, __LINE__ ); exit( -1 ); }
    #endif


/* C library support -- only XCLIB and NEWLIB are supported. */

/* To enable thread-safe C library support, XT_USE_THREAD_SAFE_CLIB must be
 * defined to be > 0 somewhere above or on the command line. */

    #if ( XT_USE_THREAD_SAFE_CLIB > 0u ) && ( XSHAL_CLIB == XTHAL_CLIB_XCLIB )
        extern void vPortClibInit( void );
    #endif // XCLIB support

    #if ( XT_USE_THREAD_SAFE_CLIB > 0u ) && ( XSHAL_CLIB == XTHAL_CLIB_NEWLIB )
        extern void vPortClibInit( void );

/* This C library cleanup is not currently done by FreeRTOS when deleting a task */
        #include <stdio.h>
        #define portCLEAN_UP_TCB( pxTCB )    vPortCleanUpTcbClib( &( ( pxTCB )->xNewLib_reent ) )
        static inline void vPortCleanUpTcbClib( struct _reent * ptr )
        {
            FILE * fp = &( ptr->__sf[ 0 ] );
            int i;

            for( i = 0; i < 3; ++i, ++fp )
            {
                fp->_close = NULL;
            }
        }
    #endif // NEWLIB support

#endif // __ASSEMBLER__

/* *INDENT-OFF* */
#ifdef __cplusplus
    }
#endif
/* *INDENT-ON* */

#endif /* PORTMACRO_H */