2 FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd.
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5 FreeRTOS supports many tools and architectures. V7.0.0 is sponsored by:
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6 Atollic AB - Atollic provides professional embedded systems development
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7 tools for C/C++ development, code analysis and test automation.
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8 See http://www.atollic.com
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11 ***************************************************************************
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13 * FreeRTOS tutorial books are available in pdf and paperback. *
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14 * Complete, revised, and edited pdf reference manuals are also *
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17 * Purchasing FreeRTOS documentation will not only help you, by *
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18 * ensuring you get running as quickly as possible and with an *
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19 * in-depth knowledge of how to use FreeRTOS, it will also help *
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20 * the FreeRTOS project to continue with its mission of providing *
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21 * professional grade, cross platform, de facto standard solutions *
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22 * for microcontrollers - completely free of charge! *
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24 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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26 * Thank you for using FreeRTOS, and thank you for your support! *
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28 ***************************************************************************
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31 This file is part of the FreeRTOS distribution.
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33 FreeRTOS is free software; you can redistribute it and/or modify it under
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34 the terms of the GNU General Public License (version 2) as published by the
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35 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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36 >>>NOTE<<< The modification to the GPL is included to allow you to
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37 distribute a combined work that includes FreeRTOS without being obliged to
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38 provide the source code for proprietary components outside of the FreeRTOS
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39 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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40 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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41 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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42 more details. You should have received a copy of the GNU General Public
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43 License and the FreeRTOS license exception along with FreeRTOS; if not it
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44 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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45 by writing to Richard Barry, contact details for whom are available on the
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50 http://www.FreeRTOS.org - Documentation, latest information, license and
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53 http://www.SafeRTOS.com - A version that is certified for use in safety
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56 http://www.OpenRTOS.com - Commercial support, development, porting,
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57 licensing and training services.
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60 .extern pxCurrentTCB
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61 .extern XIntc_DeviceInterruptHandler
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62 .extern vTaskSwitchContext
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63 .extern uxCriticalNesting
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66 .global vPortFreeRTOSInterruptHandler
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67 .global VPortYieldASM
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68 .global vStartFirstTask
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71 .macro portSAVE_CONTEXT
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72 /* Make room for the context on the stack. */
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74 /* Save r31 so it can then be used. */
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76 /* Copy the msr into r31 - this is stacked later. */
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78 /* Stack general registers. */
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107 /* Stack the critical section nesting value. */
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108 lwi r3, r0, uxCriticalNesting
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110 /* Save the top of stack value to the TCB. */
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111 lwi r3, r0, pxCurrentTCB
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116 .macro portRESTORE_CONTEXT
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117 /* Load the top of stack value from the TCB. */
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118 lwi r3, r0, pxCurrentTCB
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120 /* Restore the general registers. */
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151 /* Load the critical nesting value. */
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153 swi r3, r0, uxCriticalNesting
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155 /* Obtain the MSR value from the stack. */
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158 /* Are interrupts enabled in the MSR? If so return using an return from
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159 interrupt instruction to ensure interrupts are enabled only once the task
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160 is running again. */
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165 /* Reload the rmsr from the stack, clear the enable interrupt bit in the
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166 value before saving back to rmsr register, then return enabling interrupts
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176 /* Reload the rmsr from the stack, place it in the rmsr register, and
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177 return without enabling interrupts. */
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191 vPortFreeRTOSInterruptHandler:
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193 /* Entered via an interrupt so interrupts must be enabled in msr. */
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197 /* Stack the return address. As we entered via an interrupt we do
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198 not need to modify the return address prior to stacking. */
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200 /* Now switch to use the ISR stack. */
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201 lwi r3, r0, pulISRStack
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203 bralid r15, XIntc_DeviceInterruptHandler
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205 portRESTORE_CONTEXT
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212 /* Modify the return address so we return to the instruction after the
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216 /* Now switch to use the ISR stack. */
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217 lwi r3, r0, pulISRStack
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219 bralid r15, vTaskSwitchContext
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221 portRESTORE_CONTEXT
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224 portRESTORE_CONTEXT
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