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141 lines
5.2 KiB
NASM
141 lines
5.2 KiB
NASM
/*
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FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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>>! NOTE: The modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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#include "FreeRTOSConfig.h"
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#include "portasm.h"
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.CODE
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/*
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* The RTOS tick ISR.
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*
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* If the cooperative scheduler is in use this simply increments the tick
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* count.
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*
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* If the preemptive scheduler is in use a context switch can also occur.
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*/
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_vTickISR:
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portSAVE_CONTEXT
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call #_xTaskIncrementTick
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cmp.w #0x00, r15
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jeq _SkipContextSwitch
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call #_vTaskSwitchContext
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_SkipContextSwitch:
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Manual context switch called by the portYIELD() macro.
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*/
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_vPortYield::
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/* Mimic an interrupt by pushing the SR. */
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push SR
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/* Now the SR is stacked we can disable interrupts. */
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dint
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/* Save the context of the current task. */
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portSAVE_CONTEXT
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/* Switch to the highest priority task that is ready to run. */
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call #_vTaskSwitchContext
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/* Restore the context of the new task. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Start off the scheduler by initialising the RTOS tick timer, then restoring
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* the context of the first task.
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*/
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_xPortStartScheduler::
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/* Setup the hardware to generate the tick. Interrupts are disabled
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when this function is called. */
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call #_prvSetupTimerInterrupt
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/* Restore the context of the first task that is going to run. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/* Place the tick ISR in the correct vector. */
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.VECTORS
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.KEEP
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ORG TIMERA0_VECTOR
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DW _vTickISR
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END
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