| ;/*
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| ; * FreeRTOS Kernel <DEVELOPMENT BRANCH>
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| ; * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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| ; *
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| ; * SPDX-License-Identifier: MIT |
| ; * |
| ; * 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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| ; * https://www.FreeRTOS.org
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| ; * https://github.com/FreeRTOS
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| ; *
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| ; */
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|
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| #include "ISR_Support.h"
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|
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| #define CS 0xFFFFC
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| #define ES 0xFFFFD
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|
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| PUBLIC vPortYield
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| PUBLIC vPortStartFirstTask
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| PUBLIC vPortTickISR
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|
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| EXTERN vTaskSwitchContext
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| EXTERN xTaskIncrementTick
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|
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| ; FreeRTOS yield handler. This is installed as the BRK software interrupt
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| ; handler.
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| RSEG CODE:CODE
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| vPortYield:
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| portSAVE_CONTEXT ; Save the context of the current task.
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| call vTaskSwitchContext ; Call the scheduler to select the next task.
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| portRESTORE_CONTEXT ; Restore the context of the next task to run.
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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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| RSEG CODE:CODE
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| vPortStartFirstTask:
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| portRESTORE_CONTEXT ; Restore the context of whichever task the ...
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| reti ; An interrupt stack frame is used so the task
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| ; is started using a RETI instruction.
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|
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| ; FreeRTOS tick handler. This is installed as the interval timer interrupt
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| ; handler.
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| RSEG CODE:CODE
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| vPortTickISR:
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| portSAVE_CONTEXT ; Save the context of the current task.
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| call xTaskIncrementTick ; Call the timer tick function.
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| cmpw ax, #0x00
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| skz
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| call vTaskSwitchContext ; Call the scheduler to select the next task.
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| portRESTORE_CONTEXT ; Restore the context of the next task to run.
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| reti
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|
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| ; Install the interrupt handlers
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| COMMON INTVEC:CODE:ROOT(1)
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| ORG configTICK_VECTOR
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| DW vPortTickISR
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| COMMON INTVEC:CODE:ROOT(1)
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| ORG 126
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| DW vPortYield
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| END |