/*
 * 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

#ifdef __cplusplus
extern "C" {
#endif

#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( configUSE_16_BIT_TICKS == 1 )
    typedef uint16_t TickType_t;
    #define portMAX_DELAY ( TickType_t ) 0xffff
#else
    typedef uint32_t TickType_t;
    #define portMAX_DELAY ( TickType_t ) 0xffffffffUL
#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__

#ifdef __cplusplus
}
#endif

#endif /* PORTMACRO_H */