2 FreeRTOS V8.2.0 - Copyright (C) 2015 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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69 .extern pxCurrentTCB
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70 .extern vTaskISRHandler
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71 .extern vTaskSwitchContext
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72 .extern uxCriticalNesting
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75 .global __FreeRTOS_interrupt_handler
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76 .global VPortYieldASM
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77 .global vStartFirstTask
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80 .macro portSAVE_CONTEXT
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81 /* Make room for the context on the stack. */
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83 /* Save r31 so it can then be used. */
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85 /* Copy the msr into r31 - this is stacked later. */
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87 /* Stack general registers. */
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116 /* Stack the critical section nesting value. */
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117 lwi r3, r0, uxCriticalNesting
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119 /* Save the top of stack value to the TCB. */
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120 lwi r3, r0, pxCurrentTCB
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125 .macro portRESTORE_CONTEXT
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126 /* Load the top of stack value from the TCB. */
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127 lwi r3, r0, pxCurrentTCB
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129 /* Restore the general registers. */
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160 /* Load the critical nesting value. */
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162 swi r3, r0, uxCriticalNesting
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164 /* Obtain the MSR value from the stack. */
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167 /* Are interrupts enabled in the MSR? If so return using an return from
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168 interrupt instruction to ensure interrupts are enabled only once the task
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169 is running again. */
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174 /* Reload the rmsr from the stack, clear the enable interrupt bit in the
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175 value before saving back to rmsr register, then return enabling interrupts
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185 /* Reload the rmsr from the stack, place it in the rmsr register, and
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186 return without enabling interrupts. */
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200 __FreeRTOS_interrupt_handler:
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202 /* Entered via an interrupt so interrupts must be enabled in msr. */
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206 /* Stack the return address. As we entered via an interrupt we do
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207 not need to modify the return address prior to stacking. */
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209 /* Now switch to use the ISR stack. */
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210 lwi r3, r0, pulISRStack
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212 bralid r15, vTaskISRHandler
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214 portRESTORE_CONTEXT
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221 /* Modify the return address so we return to the instruction after the
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225 /* Now switch to use the ISR stack. */
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226 lwi r3, r0, pulISRStack
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228 bralid r15, vTaskSwitchContext
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230 portRESTORE_CONTEXT
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233 portRESTORE_CONTEXT
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