/*
	FreeRTOS.org V5.3.0 - Copyright (C) 2003-2009 Richard Barry.

	This file is part of the FreeRTOS.org distribution.

	FreeRTOS.org 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 exception to the GPL is included to allow you to distribute a
	combined work that includes FreeRTOS.org without being obliged to provide
	the source code for any proprietary components.  Alternative commercial
	license and support terms are also available upon request.  See the 
	licensing section of http://www.FreeRTOS.org for full details.

	FreeRTOS.org 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 along
	with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
	Temple Place, Suite 330, Boston, MA  02111-1307  USA.


	***************************************************************************
	*                                                                         *
	* Get the FreeRTOS eBook!  See http://www.FreeRTOS.org/Documentation      *
	*                                                                         *
	* This is a concise, step by step, 'hands on' guide that describes both   *
	* general multitasking concepts and FreeRTOS specifics. It presents and   *
	* explains numerous examples that are written using the FreeRTOS API.     *
	* Full source code for all the examples is provided in an accompanying    *
	* .zip file.                                                              *
	*                                                                         *
	***************************************************************************

	1 tab == 4 spaces!

	Please ensure to read the configuration and relevant port sections of the
	online documentation.

	http://www.FreeRTOS.org - Documentation, latest information, license and
	contact details.

	http://www.SafeRTOS.com - A version that is certified for use in safety
	critical systems.

	http://www.OpenRTOS.com - Commercial support, development, porting,
	licensing and training services.
*/


#ifndef PORTMACRO_H
#define PORTMACRO_H

/*-----------------------------------------------------------
 * Port specific definitions.  
 *
 * The settings in this file configure FreeRTOS correctly for the
 * given hardware and compiler.
 *
 * These settings should not be altered.
 *-----------------------------------------------------------
 */

/* Type definitions. */
#define portCHAR		char
#define portFLOAT		float
#define portDOUBLE		double
#define portLONG		long
#define portSHORT		short
#define portSTACK_TYPE	unsigned portCHAR
#define portBASE_TYPE	char

#if( configUSE_16_BIT_TICKS == 1 )
	typedef unsigned portSHORT portTickType;
	#define portMAX_DELAY ( portTickType ) 0xffff
#else
	typedef unsigned portLONG portTickType;
	#define portMAX_DELAY ( portTickType ) 0xffffffff
#endif
/*-----------------------------------------------------------*/

/* Hardware specifics. */
#define portBYTE_ALIGNMENT			1
#define portSTACK_GROWTH			( -1 )
#define portTICK_RATE_MS			( ( portTickType ) 1000 / configTICK_RATE_HZ )		
#define portYIELD()					__asm( "swi" );
#define portNOP()					__asm( "nop" );
/*-----------------------------------------------------------*/

/* Critical section handling. */
#define portENABLE_INTERRUPTS()				__asm( "cli" )	
#define portDISABLE_INTERRUPTS()			__asm( "sei" )

/*
 * Disable interrupts before incrementing the count of critical section nesting.
 * The nesting count is maintained so we know when interrupts should be
 * re-enabled.  Once interrupts are disabled the nesting count can be accessed
 * directly.  Each task maintains its own nesting count.
 */
#define portENTER_CRITICAL()  									\
{																\
	extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																\
	portDISABLE_INTERRUPTS();									\
	uxCriticalNesting++;										\
}

/*
 * Interrupts are disabled so we can access the nesting count directly.  If the
 * nesting is found to be 0 (no nesting) then we are leaving the critical 
 * section and interrupts can be re-enabled.
 */
#define  portEXIT_CRITICAL()									\
{																\
	extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																\
	uxCriticalNesting--;										\
	if( uxCriticalNesting == 0 )								\
	{															\
		portENABLE_INTERRUPTS();								\
	}															\
}
/*-----------------------------------------------------------*/

/* Task utilities. */

/* 
 * These macros are very simple as the processor automatically saves and 
 * restores its registers as interrupts are entered and exited.  In
 * addition to the (automatically stacked) registers we also stack the 
 * critical nesting count.  Each task maintains its own critical nesting
 * count as it is legitimate for a task to yield from within a critical
 * section.  If the banked memory model is being used then the PPAGE
 * register is also stored as part of the tasks context.
 */

#ifdef BANKED_MODEL
	/* 
	 * Load the stack pointer for the task, then pull the critical nesting
	 * count and PPAGE register from the stack.  The remains of the 
	 * context are restored by the RTI instruction.
	 */
	#define portRESTORE_CONTEXT()									\
	{																\
		extern volatile void * pxCurrentTCB;						\
		extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																	\
		__asm( "ldx pxCurrentTCB" );								\
		__asm( "lds 0, x" );										\
		__asm( "pula" );											\
		__asm( "staa uxCriticalNesting" );							\
		__asm( "pula" );											\
		__asm( "staa 0x30" ); /* 0x30 = PPAGE */					\
	}

	/* 
	 * By the time this macro is called the processor has already stacked the
	 * registers.  Simply stack the nesting count and PPAGE value, then save 
	 * the task stack pointer.
	 */
	#define portSAVE_CONTEXT()										\
	{																\
		extern volatile void * pxCurrentTCB;						\
		extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																	\
		__asm( "ldaa 0x30" );  /* 0x30 = PPAGE */					\
		__asm( "psha" );											\
		__asm( "ldaa uxCriticalNesting" );							\
		__asm( "psha" );											\
		__asm( "ldx pxCurrentTCB" );								\
		__asm( "sts 0, x" );										\
	}
#else

	/* 
	 * These macros are as per the BANKED versions above, but without saving
	 * and restoring the PPAGE register.
	 */

	#define portRESTORE_CONTEXT()									\
	{																\
		extern volatile void * pxCurrentTCB;						\
		extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																	\
		__asm( "ldx pxCurrentTCB" );								\
		__asm( "lds 0, x" );										\
		__asm( "pula" );											\
		__asm( "staa uxCriticalNesting" );							\
	}

	#define portSAVE_CONTEXT()										\
	{																\
		extern volatile void * pxCurrentTCB;						\
		extern volatile unsigned portBASE_TYPE uxCriticalNesting;	\
																	\
		__asm( "ldaa uxCriticalNesting" );							\
		__asm( "psha" );											\
		__asm( "ldx pxCurrentTCB" );								\
		__asm( "sts 0, x" );										\
	}
#endif

/*
 * Utility macro to call macros above in correct order in order to perform a
 * task switch from within a standard ISR.  This macro can only be used if
 * the ISR does not use any local (stack) variables.  If the ISR uses stack
 * variables portYIELD() should be used in it's place.
 */
#define portTASK_SWITCH_FROM_ISR()								\
	portSAVE_CONTEXT();											\
	vTaskSwitchContext();										\
	portRESTORE_CONTEXT();


/* Task function macros as described on the FreeRTOS.org WEB site. */
#define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )
#define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )

#endif /* PORTMACRO_H */

