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- /*
- * FreeRTOS Kernel <DEVELOPMENT BRANCH>
- * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * SPDX-License-Identifier: MIT
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
- * this software and associated documentation files (the "Software"), to deal in
- * the Software without restriction, including without limitation the rights to
- * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
- * the Software, and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
- * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
- * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * https://www.FreeRTOS.org
- * https://github.com/FreeRTOS
- *
- */
- #include "FreeRTOSConfig.h"
- #include "ISR_Support.h"
- .global _vPortYield
- .global _vPortStartFirstTask
- .global _vPortTickISR
- .extern _vTaskSwitchContext
- .extern _xTaskIncrementTick
- .text
- .align 2
- /* FreeRTOS yield handler. This is installed as the BRK software interrupt
- handler. */
- _vPortYield:
- /* Save the context of the current task. */
- portSAVE_CONTEXT
- /* Call the scheduler to select the next task. */
- call !!_vTaskSwitchContext
- /* Restore the context of the next task to run. */
- portRESTORE_CONTEXT
- retb
- /* Starts the scheduler by restoring the context of the task that will execute
- first. */
- .align 2
- _vPortStartFirstTask:
- /* Restore the context of whichever task will execute first. */
- portRESTORE_CONTEXT
- /* An interrupt stack frame is used so the task is started using RETI. */
- reti
- /* FreeRTOS tick handler. This is installed as the interval timer interrupt
- handler. */
- .align 2
- _vPortTickISR:
- /* Save the context of the currently executing task. */
- portSAVE_CONTEXT
- /* Call the RTOS tick function. */
- call !!_xTaskIncrementTick
- #if configUSE_PREEMPTION == 1
- /* Select the next task to run. */
- call !!_vTaskSwitchContext
- #endif
- /* Retore the context of whichever task will run next. */
- portRESTORE_CONTEXT
- reti
- .end
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