2 FreeRTOS V7.4.0 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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5 http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS tutorial books are available in pdf and paperback. *
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10 * Complete, revised, and edited pdf reference manuals are also *
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13 * Purchasing FreeRTOS documentation will not only help you, by *
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14 * ensuring you get running as quickly as possible and with an *
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15 * in-depth knowledge of how to use FreeRTOS, it will also help *
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16 * the FreeRTOS project to continue with its mission of providing *
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17 * professional grade, cross platform, de facto standard solutions *
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18 * for microcontrollers - completely free of charge! *
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20 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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22 * Thank you for using FreeRTOS, and thank you for your support! *
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24 ***************************************************************************
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27 This file is part of the FreeRTOS distribution.
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29 FreeRTOS is free software; you can redistribute it and/or modify it under
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30 the terms of the GNU General Public License (version 2) as published by the
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31 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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33 >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to
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34 distribute a combined work that includes FreeRTOS without being obliged to
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35 provide the source code for proprietary components outside of the FreeRTOS
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38 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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39 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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40 FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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41 details. You should have received a copy of the GNU General Public License
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42 and the FreeRTOS license exception along with FreeRTOS; if not itcan be
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43 viewed here: http://www.freertos.org/a00114.html and also obtained by
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44 writing to Real Time Engineers Ltd., contact details for whom are available
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45 on the FreeRTOS WEB site.
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49 ***************************************************************************
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51 * Having a problem? Start by reading the FAQ "My application does *
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52 * not run, what could be wrong?" *
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54 * http://www.FreeRTOS.org/FAQHelp.html *
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56 ***************************************************************************
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59 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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60 license and Real Time Engineers Ltd. contact details.
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62 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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63 including FreeRTOS+Trace - an indispensable productivity tool, and our new
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64 fully thread aware and reentrant UDP/IP stack.
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66 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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67 Integrity Systems, who sell the code with commercial support,
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68 indemnification and middleware, under the OpenRTOS brand.
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70 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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71 engineered and independently SIL3 certified version for use in safety and
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72 mission critical applications that require provable dependability.
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74 .extern pxCurrentTCB
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75 .extern vTaskISRHandler
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76 .extern vTaskSwitchContext
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77 .extern uxCriticalNesting
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80 .global __FreeRTOS_interrupt_handler
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81 .global VPortYieldASM
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82 .global vStartFirstTask
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85 .macro portSAVE_CONTEXT
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86 /* Make room for the context on the stack. */
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88 /* Save r31 so it can then be used. */
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90 /* Copy the msr into r31 - this is stacked later. */
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92 /* Stack general registers. */
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121 /* Stack the critical section nesting value. */
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122 lwi r3, r0, uxCriticalNesting
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124 /* Save the top of stack value to the TCB. */
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125 lwi r3, r0, pxCurrentTCB
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130 .macro portRESTORE_CONTEXT
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131 /* Load the top of stack value from the TCB. */
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132 lwi r3, r0, pxCurrentTCB
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134 /* Restore the general registers. */
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165 /* Load the critical nesting value. */
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167 swi r3, r0, uxCriticalNesting
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169 /* Obtain the MSR value from the stack. */
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172 /* Are interrupts enabled in the MSR? If so return using an return from
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173 interrupt instruction to ensure interrupts are enabled only once the task
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174 is running again. */
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179 /* Reload the rmsr from the stack, clear the enable interrupt bit in the
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180 value before saving back to rmsr register, then return enabling interrupts
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190 /* Reload the rmsr from the stack, place it in the rmsr register, and
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191 return without enabling interrupts. */
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205 __FreeRTOS_interrupt_handler:
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207 /* Entered via an interrupt so interrupts must be enabled in msr. */
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211 /* Stack the return address. As we entered via an interrupt we do
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212 not need to modify the return address prior to stacking. */
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214 /* Now switch to use the ISR stack. */
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215 lwi r3, r0, pulISRStack
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217 bralid r15, vTaskISRHandler
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219 portRESTORE_CONTEXT
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226 /* Modify the return address so we return to the instruction after the
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230 /* Now switch to use the ISR stack. */
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231 lwi r3, r0, pulISRStack
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233 bralid r15, vTaskSwitchContext
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235 portRESTORE_CONTEXT
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238 portRESTORE_CONTEXT
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