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 #include "FreeRTOSConfig.h"
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30 #include "ISR_Support.h"
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33 .global _vPortStartFirstTask
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34 .global _vPortTickISR
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36 .extern _vTaskSwitchContext
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37 .extern _xTaskIncrementTick
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42 /* FreeRTOS yield handler. This is installed as the BRK software interrupt
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45 /* Save the context of the current task. */
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47 /* Call the scheduler to select the next task. */
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48 call !!_vTaskSwitchContext
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49 /* Restore the context of the next task to run. */
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54 /* Starts the scheduler by restoring the context of the task that will execute
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57 _vPortStartFirstTask:
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58 /* Restore the context of whichever task will execute first. */
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60 /* An interrupt stack frame is used so the task is started using RETI. */
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63 /* FreeRTOS tick handler. This is installed as the interval timer interrupt
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68 /* Save the context of the currently executing task. */
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70 /* Call the RTOS tick function. */
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71 call !!_xTaskIncrementTick
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72 #if configUSE_PREEMPTION == 1
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73 /* Select the next task to run. */
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74 call !!_vTaskSwitchContext
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76 /* Retore the context of whichever task will run next. */
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