/*
    FreeRTOS V9.0.0 - Copyright (C) 2016 Real Time Engineers Ltd.
    All rights reserved

    VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.

    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.  Full license text is available on the following
    link: http://www.freertos.org/a00114.html

    ***************************************************************************
     *                                                                       *
     *    FreeRTOS provides completely free yet professionally developed,    *
     *    robust, strictly quality controlled, supported, and cross          *
     *    platform software that is more than just the market leader, it     *
     *    is the industry's de facto standard.                               *
     *                                                                       *
     *    Help yourself get started quickly while simultaneously helping     *
     *    to support the FreeRTOS project by purchasing a FreeRTOS           *
     *    tutorial book, reference manual, or both:                          *
     *    http://www.FreeRTOS.org/Documentation                              *
     *                                                                       *
    ***************************************************************************

    http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading
    the FAQ page "My application does not run, what could be wrong?".  Have you
    defined configASSERT()?

    http://www.FreeRTOS.org/support - In return for receiving this top quality
    embedded software for free we request you assist our global community by
    participating in the support forum.

    http://www.FreeRTOS.org/training - Investing in training allows your team to
    be as productive as possible as early as possible.  Now you can receive
    FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
    Ltd, and the world's leading authority on the world's leading RTOS.

    http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
    including FreeRTOS+Trace - an indispensable productivity tool, a DOS
    compatible FAT file system, and our tiny thread aware UDP/IP stack.

    http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
    Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.

    http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
    Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS
    licenses offer ticketed support, indemnification and commercial middleware.

    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.

    1 tab == 4 spaces!
*/

/* Kernel includes. */
#include "FreeRTOS.h"

/* Machine includes */
#include <tc1782.h>
#include <machine/intrinsics.h>
#include <machine/cint.h>
/*---------------------------------------------------------------------------*/

/*
 * This reference is required by the Save/Restore Context Macros.
 */
extern volatile uint32_t *pxCurrentTCB;
/*-----------------------------------------------------------*/

/*
 * This file contains base definitions for all of the possible traps in the system.
 * It is suggested to provide implementations for all of the traps but for
 * the time being they simply trigger a DEBUG instruction so that it is easy
 * to see what caused a particular trap.
 *
 * Trap Class 6, the SYSCALL, is used exclusively by the operating system.
 */

/* The Trap Classes. */
#define portMMU_TRAP										0
#define portIPT_TRAP										1
#define portIE_TRAP											2
#define portCM_TRAP											3
#define portSBP_TRAP										4
#define portASSERT_TRAP										5
#define portNMI_TRAP										7

/* MMU Trap Identifications. */
#define portTIN_MMU_VIRTUAL_ADDRESS_FILL					0
#define portTIN_MMU_VIRTUAL_ADDRESS_PROTECTION				1

/* Internal Protection Trap Identifications. */
#define portTIN_IPT_PRIVILIGED_INSTRUCTION					1
#define portTIN_IPT_MEMORY_PROTECTION_READ					2
#define portTIN_IPT_MEMORY_PROTECTION_WRITE					3
#define portTIN_IPT_MEMORY_PROTECTION_EXECUTION				4
#define portTIN_IPT_MEMORY_PROTECTION_PERIPHERAL_ACCESS		5
#define portTIN_IPT_MEMORY_PROTECTION_NULL_ADDRESS			6
#define portTIN_IPT_MEMORY_PROTECTION_GLOBAL_REGISTER_WRITE_PROTECTION	7

/* Instruction Error Trap Identifications. */
#define portTIN_IE_ILLEGAL_OPCODE							1
#define portTIN_IE_UNIMPLEMENTED_OPCODE						2
#define portTIN_IE_INVALID_OPERAND							3
#define portTIN_IE_DATA_ADDRESS_ALIGNMENT					4
#define portTIN_IE_INVALID_LOCAL_MEMORY_ADDRESS				5

/* Context Management Trap Identifications. */
#define portTIN_CM_FREE_CONTEXT_LIST_DEPLETION				1
#define portTIN_CM_CALL_DEPTH_OVERFLOW						2
#define portTIN_CM_CALL_DEPTH_UNDEFLOW						3
#define portTIN_CM_FREE_CONTEXT_LIST_UNDERFLOW				4
#define portTIN_CM_CALL_STACK_UNDERFLOW						5
#define portTIN_CM_CONTEXT_TYPE								6
#define portTIN_CM_NESTING_ERROR							7

/* System Bus and Peripherals Trap Identifications. */
#define portTIN_SBP_PROGRAM_FETCH_SYNCHRONOUS_ERROR			1
#define portTIN_SBP_DATA_ACCESS_SYNCHRONOUS_ERROR			2
#define portTIN_SBP_DATA_ACCESS_ASYNCHRONOUS_ERROR			3
#define portTIN_SBP_COPROCESSOR_TRAP_ASYNCHRONOUS_ERROR		4
#define portTIN_SBP_PROGRAM_MEMORY_INTEGRITY_ERROR			5
#define portTIN_SBP_DATA_MEMORY_INTEGRITY_ERROR				6

/* Assertion Trap Identifications. */
#define portTIN_ASSERT_ARITHMETIC_OVERFLOW					1
#define portTIN_ASSERT_STICKY_ARITHMETIC_OVERFLOW			2

/* Non-maskable Interrupt Trap Identifications. */
#define portTIN_NMI_NON_MASKABLE_INTERRUPT					0
/*---------------------------------------------------------------------------*/

void vMMUTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vInternalProtectionTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vInstructionErrorTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vContextManagementTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vSystemBusAndPeripheralsTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vAssertionTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
void vNonMaskableInterruptTrap( int iTrapIdentification ) __attribute__( ( longcall, weak ) );
/*---------------------------------------------------------------------------*/

void vTrapInstallHandlers( void )
{
	if( 0 == _install_trap_handler ( portMMU_TRAP, vMMUTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portIPT_TRAP, vInternalProtectionTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portIE_TRAP, vInstructionErrorTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portCM_TRAP, vContextManagementTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portSBP_TRAP, vSystemBusAndPeripheralsTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portASSERT_TRAP, vAssertionTrap ) )
	{
		_debug();
	}

	if( 0 == _install_trap_handler ( portNMI_TRAP, vNonMaskableInterruptTrap ) )
	{
		_debug();
	}
}
/*-----------------------------------------------------------*/

void vMMUTrap( int iTrapIdentification )
{
	switch( iTrapIdentification )
	{
	case portTIN_MMU_VIRTUAL_ADDRESS_FILL:
	case portTIN_MMU_VIRTUAL_ADDRESS_PROTECTION:
	default:
		_debug();
		break;
	}
}
/*---------------------------------------------------------------------------*/

void vInternalProtectionTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_IPT_PRIVILIGED_INSTRUCTION:
			/* Instruction is not allowed at current execution level, eg DISABLE at User-0. */

		case portTIN_IPT_MEMORY_PROTECTION_READ:
			/* Load word using invalid address. */
			
		case portTIN_IPT_MEMORY_PROTECTION_WRITE:
			/* Store Word using invalid address. */
			
		case portTIN_IPT_MEMORY_PROTECTION_EXECUTION:
			/* PC jumped to an address outside of the valid range. */
			
		case portTIN_IPT_MEMORY_PROTECTION_PERIPHERAL_ACCESS:
			/* Access to a peripheral denied at current execution level. */
			
		case portTIN_IPT_MEMORY_PROTECTION_NULL_ADDRESS:
			/* NULL Pointer. */
			
		case portTIN_IPT_MEMORY_PROTECTION_GLOBAL_REGISTER_WRITE_PROTECTION:
			/* Tried to modify a global address pointer register. */
			
		default:
		
			pxCurrentTCB[ 0 ] = _mfcr( $PCXI );
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/

void vInstructionErrorTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_IE_ILLEGAL_OPCODE:
		case portTIN_IE_UNIMPLEMENTED_OPCODE:
		case portTIN_IE_INVALID_OPERAND:
		case portTIN_IE_DATA_ADDRESS_ALIGNMENT:
		case portTIN_IE_INVALID_LOCAL_MEMORY_ADDRESS:
		default:
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/

void vContextManagementTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_CM_FREE_CONTEXT_LIST_DEPLETION:
		case portTIN_CM_CALL_DEPTH_OVERFLOW:
		case portTIN_CM_CALL_DEPTH_UNDEFLOW:
		case portTIN_CM_FREE_CONTEXT_LIST_UNDERFLOW:
		case portTIN_CM_CALL_STACK_UNDERFLOW:
		case portTIN_CM_CONTEXT_TYPE:
		case portTIN_CM_NESTING_ERROR:
		default:
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/

void vSystemBusAndPeripheralsTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_SBP_PROGRAM_FETCH_SYNCHRONOUS_ERROR:
		case portTIN_SBP_DATA_ACCESS_SYNCHRONOUS_ERROR:
		case portTIN_SBP_DATA_ACCESS_ASYNCHRONOUS_ERROR:
		case portTIN_SBP_COPROCESSOR_TRAP_ASYNCHRONOUS_ERROR:
		case portTIN_SBP_PROGRAM_MEMORY_INTEGRITY_ERROR:
		case portTIN_SBP_DATA_MEMORY_INTEGRITY_ERROR:
		default:
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/

void vAssertionTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_ASSERT_ARITHMETIC_OVERFLOW:
		case portTIN_ASSERT_STICKY_ARITHMETIC_OVERFLOW:
		default:
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/

void vNonMaskableInterruptTrap( int iTrapIdentification )
{
	/* Deliberate fall through to default. */
	switch( iTrapIdentification )
	{
		case portTIN_NMI_NON_MASKABLE_INTERRUPT:
		default:
			_debug();
			break;
	}
}
/*---------------------------------------------------------------------------*/