2 ; * FreeRTOS Kernel V10.0.0
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3 ; * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 ; * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 ; * this software and associated documentation files (the "Software"), to deal in
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7 ; * the Software without restriction, including without limitation the rights to
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8 ; * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 ; * the Software, and to permit persons to whom the Software is furnished to do so,
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10 ; * subject to the following conditions:
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12 ; * The above copyright notice and this permission notice shall be included in all
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13 ; * copies or substantial portions of the Software. If you wish to use our Amazon
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14 ; * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 ; * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 ; * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 ; * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 ; * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 ; * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 ; * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 ; * http://www.FreeRTOS.org
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24 ; * http://aws.amazon.com/freertos
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26 ; * 1 tab == 4 spaces!
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29 ; * The definition of the "register test" tasks, as described at the top of
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32 .include data_model.h
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34 .global xTaskIncrementTick
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35 .global vTaskSwitchContext
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36 .global vPortSetupTimerInterrupt
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37 .global pxCurrentTCB
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38 .global usCriticalNesting
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40 .def vPortPreemptiveTickISR
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41 .def vPortCooperativeTickISR
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43 .def xPortStartScheduler
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45 ;-----------------------------------------------------------
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47 portSAVE_CONTEXT .macro
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49 ;Save the remaining registers.
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51 mov.w &usCriticalNesting, r14
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53 mov_x &pxCurrentTCB, r12
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56 ;-----------------------------------------------------------
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58 portRESTORE_CONTEXT .macro
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60 mov_x &pxCurrentTCB, r12
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63 mov.w r15, &usCriticalNesting
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70 ;-----------------------------------------------------------
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73 ;* The RTOS tick ISR.
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75 ;* If the cooperative scheduler is in use this simply increments the tick
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78 ;* If the preemptive scheduler is in use a context switch can also occur.
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84 vPortPreemptiveTickISR: .asmfunc
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86 ; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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87 ;to save it manually before it gets modified (interrupts get disabled).
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91 call_x #xTaskIncrementTick
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92 call_x #vTaskSwitchContext
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96 ;-----------------------------------------------------------
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100 vPortCooperativeTickISR: .asmfunc
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102 ; The sr is not saved in portSAVE_CONTEXT() because vPortYield() needs
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103 ;to save it manually before it gets modified (interrupts get disabled).
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107 call_x #xTaskIncrementTick
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109 portRESTORE_CONTEXT
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112 ;-----------------------------------------------------------
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115 ; Manual context switch called by the portYIELD() macro.
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120 vPortYield: .asmfunc
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122 ; The sr needs saving before it is modified.
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125 ; Now the SR is stacked we can disable interrupts.
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129 ; Save the context of the current task.
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132 ; Select the next task to run.
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133 call_x #vTaskSwitchContext
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135 ; Restore the context of the new task.
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136 portRESTORE_CONTEXT
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138 ;-----------------------------------------------------------
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142 ; Start off the scheduler by initialising the RTOS tick timer, then restoring
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143 ; the context of the first task.
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148 xPortStartScheduler: .asmfunc
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150 ; Setup the hardware to generate the tick. Interrupts are disabled
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151 ; when this function is called.
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152 call_x #vPortSetupTimerInterrupt
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154 ; Restore the context of the first task that is going to run.
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155 portRESTORE_CONTEXT
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157 ;-----------------------------------------------------------
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