2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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66 .extern pxCurrentTCB
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67 .extern vTaskISRHandler
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68 .extern vTaskSwitchContext
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69 .extern uxCriticalNesting
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72 .global __FreeRTOS_interrupt_handler
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73 .global VPortYieldASM
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74 .global vStartFirstTask
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77 .macro portSAVE_CONTEXT
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78 /* Make room for the context on the stack. */
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80 /* Save r31 so it can then be used. */
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82 /* Copy the msr into r31 - this is stacked later. */
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84 /* Stack general registers. */
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113 /* Stack the critical section nesting value. */
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114 lwi r3, r0, uxCriticalNesting
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116 /* Save the top of stack value to the TCB. */
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117 lwi r3, r0, pxCurrentTCB
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122 .macro portRESTORE_CONTEXT
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123 /* Load the top of stack value from the TCB. */
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124 lwi r3, r0, pxCurrentTCB
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126 /* Restore the general registers. */
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157 /* Load the critical nesting value. */
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159 swi r3, r0, uxCriticalNesting
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161 /* Obtain the MSR value from the stack. */
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164 /* Are interrupts enabled in the MSR? If so return using an return from
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165 interrupt instruction to ensure interrupts are enabled only once the task
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166 is running again. */
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171 /* Reload the rmsr from the stack, clear the enable interrupt bit in the
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172 value before saving back to rmsr register, then return enabling interrupts
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182 /* Reload the rmsr from the stack, place it in the rmsr register, and
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183 return without enabling interrupts. */
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197 __FreeRTOS_interrupt_handler:
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199 /* Entered via an interrupt so interrupts must be enabled in msr. */
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203 /* Stack the return address. As we entered via an interrupt we do
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204 not need to modify the return address prior to stacking. */
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206 /* Now switch to use the ISR stack. */
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207 lwi r3, r0, pulISRStack
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209 bralid r15, vTaskISRHandler
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211 portRESTORE_CONTEXT
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218 /* Modify the return address so we return to the instruction after the
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222 /* Now switch to use the ISR stack. */
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223 lwi r3, r0, pulISRStack
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225 bralid r15, vTaskSwitchContext
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227 portRESTORE_CONTEXT
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230 portRESTORE_CONTEXT
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