/*
    FreeRTOS V7.4.1 - Copyright (C) 2013 Real Time Engineers Ltd.

    FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT
    http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS tutorial books are available in pdf and paperback.        *
     *    Complete, revised, and edited pdf reference manuals are also       *
     *    available.                                                         *
     *                                                                       *
     *    Purchasing FreeRTOS documentation will not only help you, by       *
     *    ensuring you get running as quickly as possible and with an        *
     *    in-depth knowledge of how to use FreeRTOS, it will also help       *
     *    the FreeRTOS project to continue with its mission of providing     *
     *    professional grade, cross platform, de facto standard solutions    *
     *    for microcontrollers - completely free of charge!                  *
     *                                                                       *
     *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *
     *                                                                       *
     *    Thank you for using FreeRTOS, and thank you for your support!      *
     *                                                                       *
    ***************************************************************************


    This file is part of the FreeRTOS distribution.

    FreeRTOS is free software; you can redistribute it and/or modify it under
    the terms of the GNU General Public License (version 2) as published by the
    Free Software Foundation AND MODIFIED BY the FreeRTOS exception.

    >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
    distribute a combined work that includes FreeRTOS without being obliged to
    provide the source code for proprietary components outside of the FreeRTOS
    kernel.

    FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
    details. You should have received a copy of the GNU General Public License
    and the FreeRTOS license exception along with FreeRTOS; if not it can be
    viewed here: http://www.freertos.org/a00114.html and also obtained by
    writing to Real Time Engineers Ltd., contact details for whom are available
    on the FreeRTOS WEB site.

    1 tab == 4 spaces!

    ***************************************************************************
     *                                                                       *
     *    Having a problem?  Start by reading the FAQ "My application does   *
     *    not run, what could be wrong?"                                     *
     *                                                                       *
     *    http://www.FreeRTOS.org/FAQHelp.html                               *
     *                                                                       *
    ***************************************************************************


    http://www.FreeRTOS.org - Documentation, books, training, latest versions, 
    license and Real Time Engineers Ltd. contact details.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, and our new
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    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
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    http://www.SafeRTOS.com - High Integrity Systems also provide a safety 
    engineered and independently SIL3 certified version for use in safety and 
    mission critical applications that require provable dependability.
*/

/*-----------------------------------------------------------
 * Implementation of functions defined in portable.h for the SH2A port.
 *----------------------------------------------------------*/

/* Scheduler includes. */
#include "FreeRTOS.h"
#include "task.h"

/* Library includes. */
#include "string.h"

/*-----------------------------------------------------------*/

/* The SR assigned to a newly created task.  The only important thing in this
value is for all interrupts to be enabled. */
#define portINITIAL_SR				( 0UL )

/* Dimensions the array into which the floating point context is saved.  
Allocate enough space for FPR0 to FPR15, FPUL and FPSCR, each of which is 4
bytes big.  If this number is changed then the 72 in portasm.src also needs
changing. */
#define portFLOP_REGISTERS_TO_STORE	( 18 )
#define portFLOP_STORAGE_SIZE 		( portFLOP_REGISTERS_TO_STORE * 4 )

/*-----------------------------------------------------------*/

/*
 * The TRAPA handler used to force a context switch.
 */
void vPortYield( void );

/*
 * Function to start the first task executing - defined in portasm.src.
 */
extern void vPortStartFirstTask( void );

/*
 * Obtains the current GBR value - defined in portasm.src.
 */
extern unsigned long ulPortGetGBR( void );

/*-----------------------------------------------------------*/

/* 
 * See header file for description. 
 */
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
	/* Mark the end of the stack - used for debugging only and can be removed. */
	*pxTopOfStack = 0x11111111UL;
	pxTopOfStack--;
	*pxTopOfStack = 0x22222222UL;
	pxTopOfStack--;
	*pxTopOfStack = 0x33333333UL;
	pxTopOfStack--;

	/* SR. */
	*pxTopOfStack = portINITIAL_SR; 
	pxTopOfStack--;
	
	/* PC. */
	*pxTopOfStack = ( unsigned long ) pxCode;
	pxTopOfStack--;
	
	/* PR. */
	*pxTopOfStack = 15;
	pxTopOfStack--;
	
	/* 14. */
	*pxTopOfStack = 14;
	pxTopOfStack--;

	/* R13. */
	*pxTopOfStack = 13;
	pxTopOfStack--;

	/* R12. */
	*pxTopOfStack = 12;
	pxTopOfStack--;

	/* R11. */
	*pxTopOfStack = 11;
	pxTopOfStack--;

	/* R10. */
	*pxTopOfStack = 10;
	pxTopOfStack--;

	/* R9. */
	*pxTopOfStack = 9;
	pxTopOfStack--;

	/* R8. */
	*pxTopOfStack = 8;
	pxTopOfStack--;

	/* R7. */
	*pxTopOfStack = 7;
	pxTopOfStack--;

	/* R6. */
	*pxTopOfStack = 6;
	pxTopOfStack--;

	/* R5. */
	*pxTopOfStack = 5;
	pxTopOfStack--;

	/* R4. */
	*pxTopOfStack = ( unsigned long ) pvParameters;
	pxTopOfStack--;

	/* R3. */
	*pxTopOfStack = 3;
	pxTopOfStack--;

	/* R2. */
	*pxTopOfStack = 2;
	pxTopOfStack--;

	/* R1. */
	*pxTopOfStack = 1;
	pxTopOfStack--;
	
	/* R0 */
	*pxTopOfStack = 0;
	pxTopOfStack--;
	
	/* MACL. */
	*pxTopOfStack = 16;
	pxTopOfStack--;
	
	/* MACH. */
	*pxTopOfStack = 17;
	pxTopOfStack--;
	
	/* GBR. */
	*pxTopOfStack = ulPortGetGBR();
	
	/* GBR = global base register.
	   VBR = vector base register.
	   TBR = jump table base register.
	   R15 is the stack pointer. */

	return pxTopOfStack;
}
/*-----------------------------------------------------------*/

portBASE_TYPE xPortStartScheduler( void )
{
extern void vApplicationSetupTimerInterrupt( void );

	/* Call an application function to set up the timer that will generate the
	tick interrupt.  This way the application can decide which peripheral to 
	use.  A demo application is provided to show a suitable example. */
	vApplicationSetupTimerInterrupt();

	/* Start the first task.  This will only restore the standard registers and
	not the flop registers.  This does not really matter though because the only
	flop register that is initialised to a particular value is fpscr, and it is
	only initialised to the current value, which will still be the current value
	when the first task starts executing. */
	trapa( portSTART_SCHEDULER_TRAP_NO );

	/* Should not get here. */
	return pdFAIL;
}
/*-----------------------------------------------------------*/

void vPortEndScheduler( void )
{
	/* Not implemented as there is nothing to return to. */
}
/*-----------------------------------------------------------*/

void vPortYield( void )
{
long lInterruptMask;

	/* Ensure the yield trap runs at the same priority as the other interrupts
	that can cause a context switch. */
	lInterruptMask = get_imask();

	/* taskYIELD() can only be called from a task, not an interrupt, so the
	current interrupt mask can only be 0 or portKERNEL_INTERRUPT_PRIORITY and
	the mask can be set without risk of accidentally lowering the mask value. */	
	set_imask( portKERNEL_INTERRUPT_PRIORITY );
	
	trapa( portYIELD_TRAP_NO );
	
	/* Restore the interrupt mask to whatever it was previously (when the
	function was entered). */
	set_imask( ( int ) lInterruptMask );
}
/*-----------------------------------------------------------*/

portBASE_TYPE xPortUsesFloatingPoint( xTaskHandle xTask )
{
unsigned long *pulFlopBuffer;
portBASE_TYPE xReturn;
extern void * volatile pxCurrentTCB;

	/* This function tells the kernel that the task referenced by xTask is
	going to use the floating point registers and therefore requires the
	floating point registers saved as part of its context. */

	/* Passing NULL as xTask is used to indicate that the calling task is the
	subject task - so pxCurrentTCB is the task handle. */
	if( xTask == NULL )
	{
		xTask = ( xTaskHandle ) pxCurrentTCB;
	}

	/* Allocate a buffer large enough to hold all the flop registers. */
	pulFlopBuffer = ( unsigned long * ) pvPortMalloc( portFLOP_STORAGE_SIZE );
	
	if( pulFlopBuffer != NULL )
	{
		/* Start with the registers in a benign state. */
		memset( ( void * ) pulFlopBuffer, 0x00, portFLOP_STORAGE_SIZE );
		
		/* The first thing to get saved in the buffer is the FPSCR value -
		initialise this to the current FPSCR value. */
		*pulFlopBuffer = get_fpscr();
		
		/* Use the task tag to point to the flop buffer.  Pass pointer to just 
		above the buffer because the flop save routine uses a pre-decrement. */
		vTaskSetApplicationTaskTag( xTask, ( void * ) ( pulFlopBuffer + portFLOP_REGISTERS_TO_STORE ) );		
		xReturn = pdPASS;
	}
	else
	{
		xReturn = pdFAIL;
	}
	
	return xReturn;
}
/*-----------------------------------------------------------*/