URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [IAR/] [STR91x/] [ISR_Support.h] - Rev 579
Go to most recent revision | Compare with Previous | Blame | View Log
/* 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
Go to most recent revision | Compare with Previous | Blame | View Log