FreeRTOS/Source/portable/MPLAB/PIC24_dsPIC/portasm_PIC24.S

/*
    FreeRTOS V8.2.0rc1 - Copyright (C) 2014 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     !<<
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    >>!   obliged to provide the source code for proprietary components     !<<
    >>!   outside of the FreeRTOS kernel.                                   !<<

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    link: http://www.freertos.org/a00114.html

    1 tab == 4 spaces!

    ***************************************************************************
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    ***************************************************************************
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    ***************************************************************************
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    ***************************************************************************

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    1 tab == 4 spaces!
*/

#if defined( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ )

        .global _vPortYield
		.extern _vTaskSwitchContext
		.extern uxCriticalNesting

_vPortYield:

		PUSH	SR						/* Save the SR used by the task.... */
		PUSH	W0						/* ....then disable interrupts. */
		MOV		#32, W0
		MOV		W0, SR
		PUSH	W1						/* Save registers to the stack. */
		PUSH.D	W2
		PUSH.D	W4
		PUSH.D	W6
		PUSH.D 	W8
		PUSH.D 	W10
		PUSH.D	W12
		PUSH	W14
		PUSH	RCOUNT
		PUSH	TBLPAG

		PUSH	CORCON
		#ifdef __HAS_EDS__
			PUSH	DSRPAG
			PUSH	DSWPAG
		#else
			PUSH	PSVPAG
		#endif /* __HAS_EDS__ */
		MOV		_uxCriticalNesting, W0		/* Save the critical nesting counter for the task. */
		PUSH	W0
		MOV		_pxCurrentTCB, W0			/* Save the new top of stack into the TCB. */
		MOV		W15, [W0]

		call 	_vTaskSwitchContext

		MOV		_pxCurrentTCB, W0			/* Restore the stack pointer for the task. */
		MOV		[W0], W15
		POP		W0							/* Restore the critical nesting counter for the task. */
		MOV		W0, _uxCriticalNesting
		#ifdef __HAS_EDS__
			POP		DSWPAG
			POP		DSRPAG
		#else
			POP		PSVPAG
		#endif /* __HAS_EDS__ */
		POP		CORCON
		POP		TBLPAG
		POP		RCOUNT						/* Restore the registers from the stack. */
		POP		W14
		POP.D	W12
		POP.D	W10
		POP.D	W8
		POP.D	W6
		POP.D	W4
		POP.D	W2
		POP.D	W0
		POP		SR

        return

        .end
		
#endif /* defined( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ ) */