2 FreeRTOS V9.0.0rc2 - 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 .extern ulTopOfSystemStack
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71 .extern ulInterruptNesting
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73 /*-----------------------------------------------------------*/
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75 .macro portFREERTOS_INTERRUPT_ENTRY
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77 /* Save general purpose registers. */
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80 /* If ulInterruptNesting is zero the rest of the task context will need
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81 saving and a stack switch might be required. */
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82 movl ulInterruptNesting, %eax
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86 /* Interrupts are not nested, so save the rest of the task context. */
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87 .if configSUPPORT_FPU == 1
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89 /* If the task has a buffer allocated to save the FPU context then
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90 save the FPU context now. */
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91 movl pucPortTaskFPUContextBuffer, %eax
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94 fnsave ( %eax ) /* Save FLOP context into ucTempFPUBuffer array. */
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98 /* Save the address of the FPU context, if any. */
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99 push pucPortTaskFPUContextBuffer
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101 .endif /* configSUPPORT_FPU */
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103 /* Find the TCB. */
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104 movl pxCurrentTCB, %eax
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106 /* Stack location is first item in the TCB. */
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109 /* Switch stacks. */
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110 movl ulTopOfSystemStack, %esp
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114 /* Increment nesting count. */
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115 add $1, ulInterruptNesting
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118 /*-----------------------------------------------------------*/
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120 .macro portINTERRUPT_EPILOGUE
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123 sub $1, ulInterruptNesting
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125 /* If the nesting has unwound to zero. */
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126 movl ulInterruptNesting, %eax
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130 /* If a yield was requested then select a new TCB now. */
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131 movl ulPortYieldPending, %eax
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134 movl $0, ulPortYieldPending
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135 call vTaskSwitchContext
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138 /* Stack location is first item in the TCB. */
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139 movl pxCurrentTCB, %eax
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142 .if configSUPPORT_FPU == 1
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144 /* Restore address of task's FPU context buffer. */
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145 pop pucPortTaskFPUContextBuffer
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147 /* If the task has a buffer allocated in which its FPU context is saved,
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148 then restore it now. */
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149 movl pucPortTaskFPUContextBuffer, %eax
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160 /*-----------------------------------------------------------*/
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162 .macro portFREERTOS_INTERRUPT_EXIT
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164 portINTERRUPT_EPILOGUE
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166 movl $0x00, (0xFEE000B0)
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