portable/Renesas/SH2A_FPU/port.c

/*
 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
 * 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
 *
 */

/*-----------------------------------------------------------
 * 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 )

#if( configSUPPORT_DYNAMIC_ALLOCATION == 0 )
	#error configSUPPORT_DYNAMIC_ALLOCATION must be 1 to use this port.
#endif

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

/*
 * 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 uint32_t ulPortGetGBR( void );

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

/*
 * See header file for description.
 */
StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t 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 = ( uint32_t ) 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 = ( uint32_t ) 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;
}
/*-----------------------------------------------------------*/

BaseType_t 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 )
{
int32_t 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 );
}
/*-----------------------------------------------------------*/

BaseType_t xPortUsesFloatingPoint( TaskHandle_t xTask )
{
uint32_t *pulFlopBuffer;
BaseType_t 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 = ( TaskHandle_t ) pxCurrentTCB;
	}

	/* Allocate a buffer large enough to hold all the flop registers. */
	pulFlopBuffer = ( uint32_t * ) 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;
}
/*-----------------------------------------------------------*/