;/*
;	FreeRTOS V5.4.1 - Copyright (C) 2009 Real Time Engineers Ltd.
;
;	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 exception 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.  
;	Alternative commercial license and support terms are also available upon 
;	request.  See the licensing section of http://www.FreeRTOS.org for full 
;	license details.
;
;	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 along
;	with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
;	Temple Place, Suite 330, Boston, MA  02111-1307  USA.
;
;
;	***************************************************************************
;	*                                                                         *
;	* Looking for a quick start?  Then check out the FreeRTOS eBook!          *
;	* See http://www.FreeRTOS.org/Documentation for details                   *
;	*                                                                         *
;	***************************************************************************
;
;	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
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;
;	http://www.OpenRTOS.com - Commercial support, development, porting,
;	licensing and training services.
;*/

	IMPORT  ulCriticalNesting		;
	IMPORT	pxCurrentTCB			;


	MACRO
	portRESTORE_CONTEXT


	LDR		R0, =pxCurrentTCB		; Set the LR to the task stack.  The location was...
	LDR		R0, [R0]				; ... stored in pxCurrentTCB
	LDR		LR, [R0]

	LDR		R0, =ulCriticalNesting	; The critical nesting depth is the first item on... 
	LDMFD	LR!, {R1}				; ...the stack.  Load it into the ulCriticalNesting var.
	STR		R1, [R0]				;

	LDMFD	LR!, {R0}				; Get the SPSR from the stack.
	MSR		SPSR_cxsf, R0			;

	LDMFD	LR, {R0-R14}^			; Restore all system mode registers for the task.
	NOP								;

	LDR		LR, [LR, #+60]			; Restore the return address

									; And return - correcting the offset in the LR to obtain ...
	SUBS	PC, LR, #4				; ...the correct address.

	MEND

; /**********************************************************************/

	MACRO
	portSAVE_CONTEXT


	STMDB 	SP!, {R0}				; Store R0 first as we need to use it.

	STMDB	SP,{SP}^				; Set R0 to point to the task stack pointer.
	NOP								;
	SUB		SP, SP, #4				;
	LDMIA	SP!,{R0}				;

	STMDB	R0!, {LR}				; Push the return address onto the stack.
	MOV		LR, R0					; Now we have saved LR we can use it instead of R0.
	LDMIA	SP!, {R0}				; Pop R0 so we can save it onto the system mode stack.

	STMDB	LR,{R0-LR}^				; Push all the system mode registers onto the task stack.
	NOP								;
	SUB		LR, LR, #60				;

	MRS		R0, SPSR				; Push the SPSR onto the task stack.
	STMDB	LR!, {R0}				;

	LDR		R0, =ulCriticalNesting	;
	LDR		R0, [R0]				;
	STMDB	LR!, {R0}				;

	LDR		R0, =pxCurrentTCB		; Store the new top of stack for the task.
	LDR		R1, [R0]				; 		 
	STR		LR, [R1]				;
	
	MEND
	
	END