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;/*
; * FreeRTOS Kernel V10.4.3 LTS Patch 3
; * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
; *
; * 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
; *
; * 1 tab == 4 spaces!
; */
#include "ISR_Support.h"
#define CS 0xFFFFC
#define ES 0xFFFFD
PUBLIC vPortYield
PUBLIC vPortStartFirstTask
PUBLIC vPortTickISR
EXTERN vTaskSwitchContext
EXTERN xTaskIncrementTick
; FreeRTOS yield handler. This is installed as the BRK software interrupt
; handler.
RSEG CODE:CODE
vPortYield:
portSAVE_CONTEXT ; Save the context of the current task.
call vTaskSwitchContext ; Call the scheduler to select the next task.
portRESTORE_CONTEXT ; Restore the context of the next task to run.
retb
; Starts the scheduler by restoring the context of the task that will execute
; first.
RSEG CODE:CODE
vPortStartFirstTask:
portRESTORE_CONTEXT ; Restore the context of whichever task the ...
reti ; An interrupt stack frame is used so the task
; is started using a RETI instruction.
; FreeRTOS tick handler. This is installed as the interval timer interrupt
; handler.
RSEG CODE:CODE
vPortTickISR:
portSAVE_CONTEXT ; Save the context of the current task.
call xTaskIncrementTick ; Call the timer tick function.
cmpw ax, #0x00
skz
call vTaskSwitchContext ; Call the scheduler to select the next task.
portRESTORE_CONTEXT ; Restore the context of the next task to run.
reti
; Install the interrupt handlers
COMMON INTVEC:CODE:ROOT(1)
ORG configTICK_VECTOR
DW vPortTickISR
COMMON INTVEC:CODE:ROOT(1)
ORG 126
DW vPortYield
END
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