103 lines
2.9 KiB
NASM
103 lines
2.9 KiB
NASM
/*
|
|
* FreeRTOS Kernel V10.2.1
|
|
* Copyright (C) 2019 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.
|
|
*
|
|
* http://www.FreeRTOS.org
|
|
* http://aws.amazon.com/freertos
|
|
*
|
|
* 1 tab == 4 spaces!
|
|
*/
|
|
|
|
#include "FreeRTOSConfig.h"
|
|
#include "portasm.h"
|
|
|
|
|
|
.CODE
|
|
|
|
/*
|
|
* The RTOS tick ISR.
|
|
*
|
|
* If the cooperative scheduler is in use this simply increments the tick
|
|
* count.
|
|
*
|
|
* If the preemptive scheduler is in use a context switch can also occur.
|
|
*/
|
|
_vTickISR:
|
|
portSAVE_CONTEXT
|
|
|
|
call #_xTaskIncrementTick
|
|
cmp.w #0x00, r15
|
|
jeq _SkipContextSwitch
|
|
call #_vTaskSwitchContext
|
|
_SkipContextSwitch:
|
|
portRESTORE_CONTEXT
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
/*
|
|
* Manual context switch called by the portYIELD() macro.
|
|
*/
|
|
_vPortYield::
|
|
|
|
/* Mimic an interrupt by pushing the SR. */
|
|
push SR
|
|
|
|
/* Now the SR is stacked we can disable interrupts. */
|
|
dint
|
|
|
|
/* Save the context of the current task. */
|
|
portSAVE_CONTEXT
|
|
|
|
/* Switch to the highest priority task that is ready to run. */
|
|
call #_vTaskSwitchContext
|
|
|
|
/* Restore the context of the new task. */
|
|
portRESTORE_CONTEXT
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
/*
|
|
* Start off the scheduler by initialising the RTOS tick timer, then restoring
|
|
* the context of the first task.
|
|
*/
|
|
_xPortStartScheduler::
|
|
|
|
/* Setup the hardware to generate the tick. Interrupts are disabled
|
|
when this function is called. */
|
|
call #_prvSetupTimerInterrupt
|
|
|
|
/* Restore the context of the first task that is going to run. */
|
|
portRESTORE_CONTEXT
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
/* Place the tick ISR in the correct vector. */
|
|
.VECTORS
|
|
|
|
.KEEP
|
|
|
|
ORG TIMERA0_VECTOR
|
|
DW _vTickISR
|
|
|
|
|
|
|
|
END
|
|
|