81 lines
2.6 KiB
ArmAsm
81 lines
2.6 KiB
ArmAsm
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/*
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* FreeRTOS Kernel V10.2.1
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* Copyright (C) 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* http://www.FreeRTOS.org
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* http://aws.amazon.com/freertos
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*
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* 1 tab == 4 spaces!
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*/
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#include "FreeRTOSConfig.h"
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#include "ISR_Support.h"
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.global _vPortYield
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.global _vPortStartFirstTask
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.global _vPortTickISR
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.extern _vTaskSwitchContext
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.extern _xTaskIncrementTick
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.text
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.align 2
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/* FreeRTOS yield handler. This is installed as the BRK software interrupt
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handler. */
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_vPortYield:
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/* Save the context of the current task. */
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portSAVE_CONTEXT
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/* Call the scheduler to select the next task. */
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call !!_vTaskSwitchContext
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/* Restore the context of the next task to run. */
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portRESTORE_CONTEXT
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retb
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/* Starts the scheduler by restoring the context of the task that will execute
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first. */
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.align 2
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_vPortStartFirstTask:
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/* Restore the context of whichever task will execute first. */
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portRESTORE_CONTEXT
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/* An interrupt stack frame is used so the task is started using RETI. */
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reti
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/* FreeRTOS tick handler. This is installed as the interval timer interrupt
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handler. */
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.align 2
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_vPortTickISR:
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/* Save the context of the currently executing task. */
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portSAVE_CONTEXT
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/* Call the RTOS tick function. */
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call !!_xTaskIncrementTick
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#if configUSE_PREEMPTION == 1
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/* Select the next task to run. */
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call !!_vTaskSwitchContext
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#endif
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/* Retore the context of whichever task will run next. */
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portRESTORE_CONTEXT
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reti
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.end
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