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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [STR75x/] [ISR_Support.h] - Rev 585
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;/* ; FreeRTOS V6.1.1 - Copyright (C) 2011 Real Time Engineers Ltd. ; ; *************************************************************************** ; * * ; * If you are: * ; * * ; * + New to FreeRTOS, * ; * + Wanting to learn FreeRTOS or multitasking in general quickly * ; * + Looking for basic training, * ; * + Wanting to improve your FreeRTOS skills and productivity * ; * * ; * then take a look at the FreeRTOS books - available as PDF or paperback * ; * * ; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" * ; * http://www.FreeRTOS.org/Documentation * ; * * ; * A pdf reference manual is also available. Both are usually delivered * ; * to your inbox within 20 minutes to two hours when purchased between 8am * ; * and 8pm GMT (although please allow up to 24 hours in case of * ; * exceptional circumstances). 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 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. ; 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
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