139 lines
3.7 KiB
Plaintext
139 lines
3.7 KiB
Plaintext
/*
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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 "msp430.h"
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#include "FreeRTOSConfig.h"
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#include "data_model.h"
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IMPORT xTaskIncrementTick
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IMPORT vTaskSwitchContext
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IMPORT vPortSetupTimerInterrupt
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IMPORT pxCurrentTCB
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IMPORT usCriticalNesting
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EXPORT vPortTickISR
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EXPORT vPortYield
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EXPORT xPortStartScheduler
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portSAVE_CONTEXT macro
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/* Save the remaining registers. */
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pushm_x #12, r15
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mov.w &usCriticalNesting, r14
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push_x r14
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mov_x &pxCurrentTCB, r12
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mov_x sp, 0( r12 )
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endm
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/*-----------------------------------------------------------*/
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portRESTORE_CONTEXT macro
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mov_x &pxCurrentTCB, r12
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mov_x @r12, sp
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pop_x r15
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mov.w r15, &usCriticalNesting
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popm_x #12, r15
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nop
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pop.w sr
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nop
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reta
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endm
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/*-----------------------------------------------------------*/
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/*
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* The RTOS tick ISR.
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*
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* If the cooperative scheduler is in use this simply increments the tick
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* count.
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*
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* If the preemptive scheduler is in use a context switch can also occur.
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*/
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RSEG CODE
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EVEN
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vPortTickISR:
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/* The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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to save it manually before it gets modified (interrupts get disabled).
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Entering through this interrupt means the SR is already on the stack, but
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this keeps the stack frames identical. */
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push.w sr
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portSAVE_CONTEXT
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calla #xTaskIncrementTick
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cmp.w #0x0, R12
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jeq SkipContextSwitch
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calla #vTaskSwitchContext
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SkipContextSwitch:
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Manual context switch called by the portYIELD() macro.
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*/
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EVEN
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vPortYield:
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/* The sr needs saving before it is modified. */
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push.w sr
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/* Now the SR is stacked interrupts can be disabled. */
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dint
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nop
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/* Save the context of the current task. */
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portSAVE_CONTEXT
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/* Select the next task to run. */
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calla #vTaskSwitchContext
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/* Restore the context of the new task. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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/*
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* Start off the scheduler by initialising the RTOS tick timer, then restoring
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* the context of the first task.
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*/
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EVEN
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xPortStartScheduler:
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/* Setup the hardware to generate the tick. Interrupts are disabled
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when this function is called. */
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calla #vPortSetupTimerInterrupt
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/* Restore the context of the first task that is going to run. */
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portRESTORE_CONTEXT
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/*-----------------------------------------------------------*/
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END
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