Add FreeRTOS-Plus directory.

FreeRTOS/Source/portable/IAR/LPC2000/ISR_Support.h

@@ -0,0 +1,130 @@
+;/*
+;    FreeRTOS V7.1.1 - Copyright (C) 2012 Real Time Engineers Ltd.
+;
+;
+;    ***************************************************************************
+;     *                                                                       *
+;     *    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 Richard Barry, contact details for whom are available on the
+;    FreeRTOS WEB site.
+;
+;    1 tab == 4 spaces!
+;
+;    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.
+;*/
+	EXTERN pxCurrentTCB
+	EXTERN ulCriticalNesting
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+; Context save and restore macro definitions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+portSAVE_CONTEXT MACRO
+
+	; Push R0 as we are going to use the register. 					
+	STMDB	SP!, {R0}
+
+	; Set R0 to point to the task stack pointer. 					
+	STMDB	SP, {SP}^
+	NOP
+	SUB		SP, SP, #4
+	LDMIA	SP!, {R0}
+
+	; Push the return address onto the stack. 						
+	STMDB	R0!, {LR}
+
+	; Now we have saved LR we can use it instead of R0. 				
+	MOV		LR, R0
+
+	; Pop R0 so we can save it onto the system mode stack. 			
+	LDMIA	SP!, {R0}
+
+	; Push all the system mode registers onto the task stack. 		
+	STMDB	LR, {R0-LR}^
+	NOP
+	SUB		LR, LR, #60
+
+	; Push the SPSR onto the task stack. 							
+	MRS		R0, SPSR
+	STMDB	LR!, {R0}
+
+	LDR		R0, =ulCriticalNesting 
+	LDR		R0, [R0]
+	STMDB	LR!, {R0}
+
+	; Store the new top of stack for the task. 						
+	LDR		R1, =pxCurrentTCB
+	LDR		R0, [R1]
+	STR		LR, [R0]
+
+	ENDM
+
+
+portRESTORE_CONTEXT MACRO
+
+	; Set the LR to the task stack. 									
+	LDR		R1, =pxCurrentTCB
+	LDR		R0, [R1]
+	LDR		LR, [R0]
+
+	; The critical nesting depth is the first item on the stack. 	
+	; Load it into the ulCriticalNesting variable. 					
+	LDR		R0, =ulCriticalNesting
+	LDMFD	LR!, {R1}
+	STR		R1, [R0]
+
+	; Get the SPSR from the stack. 									
+	LDMFD	LR!, {R0}
+	MSR		SPSR_cxsf, R0
+
+	; Restore all system mode registers for the task. 				
+	LDMFD	LR, {R0-R14}^
+	NOP
+
+	; Restore the return address. 									
+	LDR		LR, [LR, #+60]
+
+	; And return - correcting the offset in the LR to obtain the 	
+	; correct address. 												
+	SUBS	PC, LR, #4
+
+	ENDM
+