2 FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 #include "FreeRTOSConfig.h"
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67 #include "ISR_Support.h"
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70 .global _vPortStartFirstTask
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71 .global _vPortTickISR
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73 .extern _vTaskSwitchContext
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74 .extern _xTaskIncrementTick
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79 /* FreeRTOS yield handler. This is installed as the BRK software interrupt
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82 /* Save the context of the current task. */
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84 /* Call the scheduler to select the next task. */
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85 call !!_vTaskSwitchContext
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86 /* Restore the context of the next task to run. */
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91 /* Starts the scheduler by restoring the context of the task that will execute
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94 _vPortStartFirstTask:
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95 /* Restore the context of whichever task will execute first. */
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97 /* An interrupt stack frame is used so the task is started using RETI. */
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100 /* FreeRTOS tick handler. This is installed as the interval timer interrupt
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105 /* Save the context of the currently executing task. */
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107 /* Call the RTOS tick function. */
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108 call !!_xTaskIncrementTick
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109 #if configUSE_PREEMPTION == 1
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110 /* Select the next task to run. */
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111 call !!_vTaskSwitchContext
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113 /* Retore the context of whichever task will run next. */
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114 portRESTORE_CONTEXT
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