2 FreeRTOS V7.5.3 - Copyright (C) 2013 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 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to distribute
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28 >>! a combined work that includes FreeRTOS without being obliged to provide
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29 >>! the source code for proprietary components outside of the FreeRTOS
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 #include <FreeRTOSConfig.h>
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72 EXTERN vTaskSwitchContext
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74 PUBLIC xPortPendSVHandler
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75 PUBLIC ulPortSetInterruptMask
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76 PUBLIC vPortClearInterruptMask
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77 PUBLIC vPortSVCHandler
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78 PUBLIC vPortStartFirstTask
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79 PUBLIC vPortEnableVFP
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82 /*-----------------------------------------------------------*/
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87 /* Get the location of the current TCB. */
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88 ldr r3, =pxCurrentTCB
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91 /* Is the task using the FPU context? If so, push high vfp registers. */
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94 vstmdbeq r0!, {s16-s31}
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96 /* Save the core registers. */
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97 stmdb r0!, {r4-r11, r14}
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99 /* Save the new top of stack into the first member of the TCB. */
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103 mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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105 bl vTaskSwitchContext
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110 /* The first item in pxCurrentTCB is the task top of stack. */
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114 /* Pop the core registers. */
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115 ldmia r0!, {r4-r11, r14}
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117 /* Is the task using the FPU context? If so, pop the high vfp registers
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121 vldmiaeq r0!, {s16-s31}
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125 #ifdef WORKAROUND_PMU_CM001 /* XMC4000 specific errata */
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126 #if WORKAROUND_PMU_CM001 == 1
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135 /*-----------------------------------------------------------*/
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137 ulPortSetInterruptMask:
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139 mov r1, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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143 /*-----------------------------------------------------------*/
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145 vPortClearInterruptMask:
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149 /*-----------------------------------------------------------*/
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152 /* Get the location of the current TCB. */
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153 ldr r3, =pxCurrentTCB
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156 /* Pop the core registers. */
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157 ldmia r0!, {r4-r11, r14}
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163 /*-----------------------------------------------------------*/
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165 vPortStartFirstTask
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166 /* Use the NVIC offset register to locate the stack. */
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167 ldr r0, =0xE000ED08
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170 /* Set the msp back to the start of the stack. */
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172 /* Call SVC to start the first task. */
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176 /*-----------------------------------------------------------*/
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179 /* The FPU enable bits are in the CPACR. */
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180 ldr.w r0, =0xE000ED88
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183 /* Enable CP10 and CP11 coprocessors, then save back. */
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184 orr r1, r1, #( 0xf << 20 )
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