/*
    FreeRTOS V7.4.2 - 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
    fully thread aware and reentrant UDP/IP stack.

    http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High 
    Integrity Systems, who sell the code with commercial support, 
    indemnification and middleware, under the OpenRTOS brand.
    
    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.
*/

/* 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 unsigned long *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;
	}
}
/*---------------------------------------------------------------------------*/