2 FreeRTOS V7.5.1 - Copyright (C) 2013 Real Time Engineers Ltd.
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4 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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6 ***************************************************************************
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8 * FreeRTOS provides completely free yet professionally developed, *
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9 * robust, strictly quality controlled, supported, and cross *
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10 * platform software that has become a de facto standard. *
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12 * Help yourself get started quickly and support the FreeRTOS *
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13 * project by purchasing a FreeRTOS tutorial book, reference *
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14 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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18 ***************************************************************************
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20 This file is part of the FreeRTOS distribution.
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22 FreeRTOS is free software; you can redistribute it and/or modify it under
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23 the terms of the GNU General Public License (version 2) as published by the
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24 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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26 >>! NOTE: The modification to the GPL is included to allow you to distribute
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27 >>! a combined work that includes FreeRTOS without being obliged to provide
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28 >>! the source code for proprietary components outside of the FreeRTOS
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31 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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32 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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33 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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34 link: http://www.freertos.org/a00114.html
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38 ***************************************************************************
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40 * Having a problem? Start by reading the FAQ "My application does *
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41 * not run, what could be wrong?" *
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43 * http://www.FreeRTOS.org/FAQHelp.html *
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45 ***************************************************************************
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47 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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48 license and Real Time Engineers Ltd. contact details.
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50 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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51 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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52 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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54 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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55 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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56 licenses offer ticketed support, indemnification and middleware.
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58 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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59 engineered and independently SIL3 certified version for use in safety and
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60 mission critical applications that require provable dependability.
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64 .extern pxCurrentTCB
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65 .extern vTaskISRHandler
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66 .extern vTaskSwitchContext
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67 .extern uxCriticalNesting
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70 .global __FreeRTOS_interrupt_handler
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71 .global VPortYieldASM
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72 .global vStartFirstTask
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75 .macro portSAVE_CONTEXT
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76 /* Make room for the context on the stack. */
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78 /* Save r31 so it can then be used. */
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80 /* Copy the msr into r31 - this is stacked later. */
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82 /* Stack general registers. */
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111 /* Stack the critical section nesting value. */
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112 lwi r3, r0, uxCriticalNesting
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114 /* Save the top of stack value to the TCB. */
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115 lwi r3, r0, pxCurrentTCB
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120 .macro portRESTORE_CONTEXT
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121 /* Load the top of stack value from the TCB. */
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122 lwi r3, r0, pxCurrentTCB
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124 /* Restore the general registers. */
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155 /* Load the critical nesting value. */
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157 swi r3, r0, uxCriticalNesting
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159 /* Obtain the MSR value from the stack. */
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162 /* Are interrupts enabled in the MSR? If so return using an return from
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163 interrupt instruction to ensure interrupts are enabled only once the task
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164 is running again. */
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169 /* Reload the rmsr from the stack, clear the enable interrupt bit in the
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170 value before saving back to rmsr register, then return enabling interrupts
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180 /* Reload the rmsr from the stack, place it in the rmsr register, and
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181 return without enabling interrupts. */
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195 __FreeRTOS_interrupt_handler:
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197 /* Entered via an interrupt so interrupts must be enabled in msr. */
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201 /* Stack the return address. As we entered via an interrupt we do
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202 not need to modify the return address prior to stacking. */
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204 /* Now switch to use the ISR stack. */
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205 lwi r3, r0, pulISRStack
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207 bralid r15, vTaskISRHandler
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209 portRESTORE_CONTEXT
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216 /* Modify the return address so we return to the instruction after the
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220 /* Now switch to use the ISR stack. */
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221 lwi r3, r0, pulISRStack
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223 bralid r15, vTaskSwitchContext
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225 portRESTORE_CONTEXT
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228 portRESTORE_CONTEXT
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