2 FreeRTOS V7.3.0 - Copyright (C) 2012 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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32 >>>NOTE<<< The modification to the GPL is included to allow you to
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33 distribute a combined work that includes FreeRTOS without being obliged to
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34 provide the source code for proprietary components outside of the FreeRTOS
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35 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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36 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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37 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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38 more details. You should have received a copy of the GNU General Public
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39 License and the FreeRTOS license exception along with FreeRTOS; if not it
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40 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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41 by writing to Richard Barry, contact details for whom are available on the
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46 ***************************************************************************
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48 * Having a problem? Start by reading the FAQ "My application does *
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49 * not run, what could be wrong?" *
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51 * http://www.FreeRTOS.org/FAQHelp.html *
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53 ***************************************************************************
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56 http://www.FreeRTOS.org - Documentation, training, latest versions, license
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57 and contact details.
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59 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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60 including FreeRTOS+Trace - an indispensable productivity tool.
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62 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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63 the code with commercial support, indemnification, and middleware, under
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64 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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65 provide a safety engineered and independently SIL3 certified version under
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66 the SafeRTOS brand: http://www.SafeRTOS.com.
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69 /* Kernel includes. */
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70 #include "FreeRTOS.h"
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73 #define portINITIAL_FORMAT_VECTOR ( ( portSTACK_TYPE ) 0x4000 )
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75 /* Supervisor mode set. */
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76 #define portINITIAL_STATUS_REGISTER ( ( portSTACK_TYPE ) 0x2000)
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78 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL(). This
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79 will be set to 0 prior to the first task being started. */
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80 static unsigned long ulCriticalNesting = 0x9999UL;
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82 /*-----------------------------------------------------------*/
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84 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE * pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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86 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;
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89 *pxTopOfStack = (portSTACK_TYPE) 0xDEADBEEF;
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92 /* Exception stack frame starts with the return address. */
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93 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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96 *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );
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99 *pxTopOfStack = ( portSTACK_TYPE ) 0x0; /*FP*/
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100 pxTopOfStack -= 14; /* A5 to D0. */
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102 return pxTopOfStack;
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104 /*-----------------------------------------------------------*/
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106 portBASE_TYPE xPortStartScheduler( void )
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108 extern void vPortStartFirstTask( void );
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110 ulCriticalNesting = 0UL;
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112 /* Configure the interrupts used by this port. */
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113 vApplicationSetupInterrupts();
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115 /* Start the first task executing. */
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116 vPortStartFirstTask();
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120 /*-----------------------------------------------------------*/
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122 void vPortEndScheduler( void )
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124 /* Not implemented as there is nothing to return to. */
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126 /*-----------------------------------------------------------*/
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128 void vPortEnterCritical( void )
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130 if( ulCriticalNesting == 0UL )
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132 /* Guard against context switches being pended simultaneously with a
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133 critical section being entered. */
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136 portDISABLE_INTERRUPTS();
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137 if( MCF_INTC0_INTFRCL == 0UL )
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142 portENABLE_INTERRUPTS();
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146 ulCriticalNesting++;
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148 /*-----------------------------------------------------------*/
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150 void vPortExitCritical( void )
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152 ulCriticalNesting--;
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153 if( ulCriticalNesting == 0 )
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155 portENABLE_INTERRUPTS();
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158 /*-----------------------------------------------------------*/
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160 void vPortYieldHandler( void )
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162 unsigned long ulSavedInterruptMask;
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164 ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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165 /* Note this will clear all forced interrupts - this is done for speed. */
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166 MCF_INTC0_INTFRCL = 0;
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167 vTaskSwitchContext();
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168 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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