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[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Source/] [portable/] [RVDS/] [ARM7_LPC21xx/] [portASM.s] - Rev 792
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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. ;*/ INCLUDE portmacro.inc IMPORT vTaskSwitchContext IMPORT vTaskIncrementTick EXPORT vPortYieldProcessor EXPORT vPortStartFirstTask EXPORT vPreemptiveTick EXPORT vPortYield VICVECTADDR EQU 0xFFFFF030 T0IR EQU 0xE0004000 T0MATCHBIT EQU 0x00000001 ARM AREA PORT_ASM, CODE, READONLY ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Starting the first task is done by just restoring the context ; setup by pxPortInitialiseStack ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; vPortStartFirstTask PRESERVE8 portRESTORE_CONTEXT vPortYield PRESERVE8 SVC 0 bx lr ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Interrupt service routine for the SWI interrupt. The vector table is ; configured in the startup.s file. ; ; vPortYieldProcessor() is used to manually force a context switch. The ; SWI interrupt is generated by a call to taskYIELD() or portYIELD(). ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; vPortYieldProcessor PRESERVE8 ; Within an IRQ ISR the link register has an offset from the true return ; address, but an SWI ISR does not. Add the offset manually so the same ; ISR return code can be used in both cases. ADD LR, LR, #4 ; Perform the context switch. portSAVE_CONTEXT ; Save current task context LDR R0, =vTaskSwitchContext ; Get the address of the context switch function MOV LR, PC ; Store the return address BX R0 ; Call the contedxt switch function portRESTORE_CONTEXT ; restore the context of the selected task ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ; Interrupt service routine for preemptive scheduler tick timer ; Only used if portUSE_PREEMPTION is set to 1 in portmacro.h ; ; Uses timer 0 of LPC21XX Family ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; vPreemptiveTick PRESERVE8 portSAVE_CONTEXT ; Save the context of the current task. LDR R0, =vTaskIncrementTick ; Increment the tick count. MOV LR, PC ; This may make a delayed task ready BX R0 ; to run. LDR R0, =vTaskSwitchContext ; Find the highest priority task that MOV LR, PC ; is ready to run. BX R0 MOV R0, #T0MATCHBIT ; Clear the timer event LDR R1, =T0IR STR R0, [R1] LDR R0, =VICVECTADDR ; Acknowledge the interrupt STR R0,[R0] portRESTORE_CONTEXT ; Restore the context of the highest ; priority task that is ready to run. END
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