/*
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 *
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 *
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 *
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 *  Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
 *
 ***************************************************************************
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 ***************************************************************************
 *
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/*******************************************************************************
 * // Copyright (c) 2003-2015 Cadence Design Systems, Inc.
 * //
 * // 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.
 * --------------------------------------------------------------------------------
 */

#include <stdlib.h>
#include <xtensa/config/core.h>

#include "xtensa_rtos.h"

#include "rom/ets_sys.h"
#include "soc/cpu.h"

#include "FreeRTOS.h"
#include "task.h"

#include "esp_panic.h"
#include "esp_heap_caps.h"
#include "esp_crosscore_int.h"

#include "esp_intr_alloc.h"

/* Defined in portasm.h */
extern void _frxt_tick_timer_init( void );

/* Defined in xtensa_context.S */
extern void _xt_coproc_init( void );


#if CONFIG_FREERTOS_CORETIMER_0
    #define SYSTICK_INTR_ID    ( ETS_INTERNAL_TIMER0_INTR_SOURCE + ETS_INTERNAL_INTR_SOURCE_OFF )
#endif
#if CONFIG_FREERTOS_CORETIMER_1
    #define SYSTICK_INTR_ID    ( ETS_INTERNAL_TIMER1_INTR_SOURCE + ETS_INTERNAL_INTR_SOURCE_OFF )
#endif

/*-----------------------------------------------------------*/

unsigned port_xSchedulerRunning[ portNUM_PROCESSORS ] = { 0 }; /* Duplicate of inaccessible xSchedulerRunning; needed at startup to avoid counting nesting */
unsigned port_interruptNesting[ portNUM_PROCESSORS ] = { 0 };  /* Interrupt nesting level. Increased/decreased in portasm.c, _frxt_int_enter/_frxt_int_exit */

/*-----------------------------------------------------------*/

/* User exception dispatcher when exiting */
void _xt_user_exit( void );

/*
 * Stack initialization
 */
/* *INDENT-OFF* */
#if portUSING_MPU_WRAPPERS
    StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
                                         TaskFunction_t pxCode,
                                         void * pvParameters,
                                         BaseType_t xRunPrivileged )
#else
    StackType_t * pxPortInitialiseStack( StackType_t * pxTopOfStack,
                                         TaskFunction_t pxCode,
                                         void * pvParameters )
#endif
/* *INDENT-ON* */
{
    StackType_t * sp, * tp;
    XtExcFrame * frame;

    #if XCHAL_CP_NUM > 0
        uint32_t * p;
    #endif

    /* Create interrupt stack frame aligned to 16 byte boundary */
    sp = ( StackType_t * ) ( ( ( UBaseType_t ) ( pxTopOfStack + 1 ) - XT_CP_SIZE - XT_STK_FRMSZ ) & ~0xf );

    /* Clear the entire frame (do not use memset() because we don't depend on C library) */
    for( tp = sp; tp <= pxTopOfStack; ++tp )
    {
        *tp = 0;
    }

    frame = ( XtExcFrame * ) sp;

    /* Explicitly initialize certain saved registers */
    frame->pc = ( UBaseType_t ) pxCode;             /* task entrypoint                */
    frame->a0 = 0;                                  /* to terminate GDB backtrace     */
    frame->a1 = ( UBaseType_t ) sp + XT_STK_FRMSZ;  /* physical top of stack frame    */
    frame->exit = ( UBaseType_t ) _xt_user_exit;    /* user exception exit dispatcher */

    /* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user mode. */
    /* Also set entry point argument parameter. */
    #ifdef __XTENSA_CALL0_ABI__
        frame->a2 = ( UBaseType_t ) pvParameters;
        frame->ps = PS_UM | PS_EXCM;
    #else
        /* + for windowed ABI also set WOE and CALLINC (pretend task was 'call4'd). */
        frame->a6 = ( UBaseType_t ) pvParameters;
        frame->ps = PS_UM | PS_EXCM | PS_WOE | PS_CALLINC( 1 );
    #endif

    #ifdef XT_USE_SWPRI
        /* Set the initial virtual priority mask value to all 1's. */
        frame->vpri = 0xFFFFFFFF;
    #endif

    #if XCHAL_CP_NUM > 0
        /* Init the coprocessor save area (see xtensa_context.h) */

        /* No access to TCB here, so derive indirectly. Stack growth is top to bottom.
         * //p = (uint32_t *) xMPUSettings->coproc_area;
         */
        p = ( uint32_t * ) ( ( ( uint32_t ) pxTopOfStack - XT_CP_SIZE ) & ~0xf );
        p[ 0 ] = 0;
        p[ 1 ] = 0;
        p[ 2 ] = ( ( ( uint32_t ) p ) + 12 + XCHAL_TOTAL_SA_ALIGN - 1 ) & -XCHAL_TOTAL_SA_ALIGN;
    #endif

    return sp;
}

/*-----------------------------------------------------------*/

void vPortEndScheduler( void )
{
    /* It is unlikely that the Xtensa port will get stopped.  If required simply
     * disable the tick interrupt here. */
}

/*-----------------------------------------------------------*/

BaseType_t xPortStartScheduler( void )
{
    /* Interrupts are disabled at this point and stack contains PS with enabled interrupts when task context is restored */

    #if XCHAL_CP_NUM > 0
        /* Initialize co-processor management for tasks. Leave CPENABLE alone. */
        _xt_coproc_init();
    #endif

    /* Init the tick divisor value */
    _xt_tick_divisor_init();

    /* Setup the hardware to generate the tick. */
    _frxt_tick_timer_init();

    port_xSchedulerRunning[ xPortGetCoreID() ] = 1;

    /* Cannot be directly called from C; never returns */
    __asm__ volatile ( "call0    _frxt_dispatch\n" );

    /* Should not get here. */
    return pdTRUE;
}
/*-----------------------------------------------------------*/

BaseType_t xPortSysTickHandler( void )
{
    BaseType_t ret;
    unsigned interruptMask;

    portbenchmarkIntLatency();
    traceISR_ENTER( SYSTICK_INTR_ID );

    /* Interrupts upto configMAX_SYSCALL_INTERRUPT_PRIORITY must be
     * disabled before calling xTaskIncrementTick as it access the
     * kernel lists. */
    interruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
    {
        ret = xTaskIncrementTick();
    }
    portCLEAR_INTERRUPT_MASK_FROM_ISR( interruptMask );

    if( ret != pdFALSE )
    {
        portYIELD_FROM_ISR();
    }
    else
    {
        traceISR_EXIT();
    }

    return ret;
}


void vPortYieldOtherCore( BaseType_t coreid )
{
    esp_crosscore_int_send_yield( coreid );
}

/*-----------------------------------------------------------*/

/*
 * Used to set coprocessor area in stack. Current hack is to reuse MPU pointer for coprocessor area.
 */
#if portUSING_MPU_WRAPPERS
    void vPortStoreTaskMPUSettings( xMPU_SETTINGS * xMPUSettings,
                                    const struct xMEMORY_REGION * const xRegions,
                                    StackType_t * pxBottomOfStack,
                                    uint32_t usStackDepth )
    {
        #if XCHAL_CP_NUM > 0
            xMPUSettings->coproc_area = ( StackType_t * ) ( ( ( ( uint32_t ) ( pxBottomOfStack + usStackDepth - 1 ) ) - XT_CP_SIZE ) & ~0xf );


            /* NOTE: we cannot initialize the coprocessor save area here because FreeRTOS is going to
             * clear the stack area after we return. This is done in pxPortInitialiseStack().
             */
        #endif
    }

    void vPortReleaseTaskMPUSettings( xMPU_SETTINGS * xMPUSettings )
    {
        /* If task has live floating point registers somewhere, release them */
        _xt_coproc_release( xMPUSettings->coproc_area );
    }

#endif /* if portUSING_MPU_WRAPPERS */

/*
 * Returns true if the current core is in ISR context; low prio ISR, med prio ISR or timer tick ISR. High prio ISRs
 * aren't detected here, but they normally cannot call C code, so that should not be an issue anyway.
 */
BaseType_t xPortInIsrContext()
{
    unsigned int irqStatus;
    BaseType_t ret;

    irqStatus = portENTER_CRITICAL_NESTED();
    ret = ( port_interruptNesting[ xPortGetCoreID() ] != 0 );
    portEXIT_CRITICAL_NESTED( irqStatus );
    return ret;
}

/*
 * This function will be called in High prio ISRs. Returns true if the current core was in ISR context
 * before calling into high prio ISR context.
 */
BaseType_t IRAM_ATTR xPortInterruptedFromISRContext()
{
    return( port_interruptNesting[ xPortGetCoreID() ] != 0 );
}

void vPortAssertIfInISR()
{
    if( xPortInIsrContext() )
    {
        ets_printf( "core=%d port_interruptNesting=%d\n\n", xPortGetCoreID(), port_interruptNesting[ xPortGetCoreID() ] );
    }

    configASSERT( !xPortInIsrContext() );
}

/*
 * For kernel use: Initialize a per-CPU mux. Mux will be initialized unlocked.
 */
void vPortCPUInitializeMutex( portMUX_TYPE * mux )
{
    #ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
        ets_printf( "Initializing mux %p\n", mux );
        mux->lastLockedFn = "(never locked)";
        mux->lastLockedLine = -1;
    #endif
    mux->owner = portMUX_FREE_VAL;
    mux->count = 0;
}

#include "portmux_impl.h"

/*
 * For kernel use: Acquire a per-CPU mux. Spinlocks, so don't hold on to these muxes for too long.
 */
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
    void vPortCPUAcquireMutex( portMUX_TYPE * mux,
                               const char * fnName,
                               int line )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();

        vPortCPUAcquireMutexIntsDisabled( mux, portMUX_NO_TIMEOUT, fnName, line );
        portEXIT_CRITICAL_NESTED( irqStatus );
    }

    bool vPortCPUAcquireMutexTimeout( portMUX_TYPE * mux,
                                      int timeout_cycles,
                                      const char * fnName,
                                      int line )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();
        bool result = vPortCPUAcquireMutexIntsDisabled( mux, timeout_cycles, fnName, line );

        portEXIT_CRITICAL_NESTED( irqStatus );
        return result;
    }

#else /* ifdef CONFIG_FREERTOS_PORTMUX_DEBUG */
    void vPortCPUAcquireMutex( portMUX_TYPE * mux )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();

        vPortCPUAcquireMutexIntsDisabled( mux, portMUX_NO_TIMEOUT );
        portEXIT_CRITICAL_NESTED( irqStatus );
    }

    bool vPortCPUAcquireMutexTimeout( portMUX_TYPE * mux,
                                      int timeout_cycles )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();
        bool result = vPortCPUAcquireMutexIntsDisabled( mux, timeout_cycles );

        portEXIT_CRITICAL_NESTED( irqStatus );
        return result;
    }
#endif /* ifdef CONFIG_FREERTOS_PORTMUX_DEBUG */


/*
 * For kernel use: Release a per-CPU mux
 *
 * Mux must be already locked by this core
 */
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
    void vPortCPUReleaseMutex( portMUX_TYPE * mux,
                               const char * fnName,
                               int line )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();

        vPortCPUReleaseMutexIntsDisabled( mux, fnName, line );
        portEXIT_CRITICAL_NESTED( irqStatus );
    }
#else
    void vPortCPUReleaseMutex( portMUX_TYPE * mux )
    {
        unsigned int irqStatus = portENTER_CRITICAL_NESTED();

        vPortCPUReleaseMutexIntsDisabled( mux );
        portEXIT_CRITICAL_NESTED( irqStatus );
    }
#endif /* ifdef CONFIG_FREERTOS_PORTMUX_DEBUG */

void vPortSetStackWatchpoint( void * pxStackStart )
{
    /*Set watchpoint 1 to watch the last 32 bytes of the stack. */
    /*Unfortunately, the Xtensa watchpoints can't set a watchpoint on a random [base - base+n] region because */
    /*the size works by masking off the lowest address bits. For that reason, we futz a bit and watch the lowest 32 */
    /*bytes of the stack we can actually watch. In general, this can cause the watchpoint to be triggered at most */
    /*28 bytes early. The value 32 is chosen because it's larger than the stack canary, which in FreeRTOS is 20 bytes. */
    /*This way, we make sure we trigger before/when the stack canary is corrupted, not after. */
    int addr = ( int ) pxStackStart;

    addr = ( addr + 31 ) & ( ~31 );
    esp_set_watchpoint( 1, ( char * ) addr, 32, ESP_WATCHPOINT_STORE );
}

#if defined( CONFIG_SPIRAM_SUPPORT )

/*
 * Compare & set (S32C1) does not work in external RAM. Instead, this routine uses a mux (in internal memory) to fake it.
 */
    static portMUX_TYPE extram_mux = portMUX_INITIALIZER_UNLOCKED;

    void uxPortCompareSetExtram( volatile uint32_t * addr,
                                 uint32_t compare,
                                 uint32_t * set )
    {
        uint32_t prev;

        #ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
            vPortCPUAcquireMutexIntsDisabled( &extram_mux, portMUX_NO_TIMEOUT, __FUNCTION__, __LINE__ );
        #else
            vPortCPUAcquireMutexIntsDisabled( &extram_mux, portMUX_NO_TIMEOUT );
        #endif
        prev = *addr;

        if( prev == compare )
        {
            *addr = *set;
        }

        *set = prev;
        #ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
            vPortCPUReleaseMutexIntsDisabled( &extram_mux, __FUNCTION__, __LINE__ );
        #else
            vPortCPUReleaseMutexIntsDisabled( &extram_mux );
        #endif
    }
#endif //defined(CONFIG_SPIRAM_SUPPORT)



uint32_t xPortGetTickRateHz( void )
{
    return ( uint32_t ) configTICK_RATE_HZ;
}