2 FreeRTOS V9.0.0 - Copyright (C) 2016 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 This file is part of the FreeRTOS distribution.
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9 FreeRTOS is free software; you can redistribute it and/or modify it under
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10 the terms of the GNU General Public License (version 2) as published by the
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11 Free Software Foundation >>>> AND MODIFIED BY <<<< the FreeRTOS exception.
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13 ***************************************************************************
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14 >>! NOTE: The modification to the GPL is included to allow you to !<<
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15 >>! distribute a combined work that includes FreeRTOS without being !<<
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16 >>! obliged to provide the source code for proprietary components !<<
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17 >>! outside of the FreeRTOS kernel. !<<
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18 ***************************************************************************
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20 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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21 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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22 FOR A PARTICULAR PURPOSE. Full license text is available on the following
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23 link: http://www.freertos.org/a00114.html
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25 ***************************************************************************
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27 * FreeRTOS provides completely free yet professionally developed, *
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28 * robust, strictly quality controlled, supported, and cross *
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29 * platform software that is more than just the market leader, it *
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30 * is the industry's de facto standard. *
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32 * Help yourself get started quickly while simultaneously helping *
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33 * to support the FreeRTOS project by purchasing a FreeRTOS *
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34 * tutorial book, reference manual, or both: *
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35 * http://www.FreeRTOS.org/Documentation *
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37 ***************************************************************************
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39 http://www.FreeRTOS.org/FAQHelp.html - Having a problem? Start by reading
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40 the FAQ page "My application does not run, what could be wrong?". Have you
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41 defined configASSERT()?
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43 http://www.FreeRTOS.org/support - In return for receiving this top quality
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44 embedded software for free we request you assist our global community by
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45 participating in the support forum.
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47 http://www.FreeRTOS.org/training - Investing in training allows your team to
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48 be as productive as possible as early as possible. Now you can receive
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49 FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers
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50 Ltd, and the world's leading authority on the world's leading RTOS.
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52 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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53 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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54 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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56 http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.
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57 Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.
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59 http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High
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60 Integrity Systems ltd. to sell under the OpenRTOS brand. Low cost OpenRTOS
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61 licenses offer ticketed support, indemnification and commercial middleware.
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63 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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64 engineered and independently SIL3 certified version for use in safety and
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65 mission critical applications that require provable dependability.
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70 /* Variables used by scheduler */
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71 .extern _pxCurrentTCB
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72 .extern _usCriticalNesting
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75 * portSAVE_CONTEXT MACRO
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76 * Saves the context of the general purpose registers, CS and ES (only in far
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77 * memory mode) registers the usCriticalNesting Value and the Stack Pointer
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78 * of the active Task onto the task stack
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80 .macro portSAVE_CONTEXT
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84 /* Save AX Register to stack. */
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87 /* Save CS register. */
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90 /* Save ES register. */
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93 /* Save the remaining general purpose registers from bank 0. */
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96 /* Save the other register banks - only necessary in the GCC port. */
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107 /* Registers in bank 3 are for ISR use only so don't need saving. */
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109 /* Save the usCriticalNesting value. */
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110 MOVW AX, !_usCriticalNesting
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112 /* Save the Stack pointer. */
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113 MOVW AX, !_pxCurrentTCB
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117 /* Switch stack pointers. */
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118 movw sp,#_stack /* Set stack pointer */
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124 * portRESTORE_CONTEXT MACRO
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125 * Restores the task Stack Pointer then use this to restore usCriticalNesting,
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126 * general purpose registers and the CS and ES (only in far memory mode)
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127 * of the selected task from the task stack
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129 .macro portRESTORE_CONTEXT MACRO
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131 /* Restore the Stack pointer. */
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132 MOVW AX, !_pxCurrentTCB
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136 /* Restore usCriticalNesting value. */
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138 MOVW !_usCriticalNesting, AX
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139 /* Restore the alternative register banks - only necessary in the GCC
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140 port. Register bank 3 is dedicated for interrupts use so is not saved or
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153 /* Restore the necessary general purpose registers. */
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156 /* Restore the ES register. */
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159 /* Restore the CS register. */
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162 /* Restore general purpose register HL. */
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