160 lines
4.1 KiB
NASM
160 lines
4.1 KiB
NASM
;/*
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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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; * The definition of the "register test" tasks, as described at the top of
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; * main.c
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.include data_model.h
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.global xTaskIncrementTick
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.global vTaskSwitchContext
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.global vPortSetupTimerInterrupt
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.global pxCurrentTCB
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.global usCriticalNesting
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.def vPortPreemptiveTickISR
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.def vPortCooperativeTickISR
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.def vPortYield
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.def xPortStartScheduler
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;-----------------------------------------------------------
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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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ret_x
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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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.text
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.align 2
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vPortPreemptiveTickISR: .asmfunc
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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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push.w sr
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portSAVE_CONTEXT
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call_x #xTaskIncrementTick
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call_x #vTaskSwitchContext
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portRESTORE_CONTEXT
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.endasmfunc
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;-----------------------------------------------------------
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.align 2
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vPortCooperativeTickISR: .asmfunc
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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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push.w sr
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portSAVE_CONTEXT
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call_x #xTaskIncrementTick
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portRESTORE_CONTEXT
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.endasmfunc
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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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.align 2
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vPortYield: .asmfunc
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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 we can disable interrupts.
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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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call_x #vTaskSwitchContext
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; Restore the context of the new task.
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portRESTORE_CONTEXT
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.endasmfunc
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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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.align 2
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xPortStartScheduler: .asmfunc
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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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call_x #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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.endasmfunc
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;-----------------------------------------------------------
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.end
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