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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65 /* Kernel includes. */
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66 #include "FreeRTOS.h"
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69 #define portINITIAL_FORMAT_VECTOR ( ( portSTACK_TYPE ) 0x4000 )
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71 /* Supervisor mode set. */
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72 #define portINITIAL_STATUS_REGISTER ( ( portSTACK_TYPE ) 0x2000)
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74 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL(). This
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75 will be set to 0 prior to the first task being started. */
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76 static unsigned long ulCriticalNesting = 0x9999UL;
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78 /*-----------------------------------------------------------*/
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80 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE * pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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82 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;
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85 *pxTopOfStack = (portSTACK_TYPE) 0xDEADBEEF;
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88 /* Exception stack frame starts with the return address. */
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89 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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92 *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );
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95 *pxTopOfStack = ( portSTACK_TYPE ) 0x0; /*FP*/
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96 pxTopOfStack -= 14; /* A5 to D0. */
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98 return pxTopOfStack;
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100 /*-----------------------------------------------------------*/
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102 portBASE_TYPE xPortStartScheduler( void )
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104 extern void vPortStartFirstTask( void );
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106 ulCriticalNesting = 0UL;
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108 /* Configure the interrupts used by this port. */
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109 vApplicationSetupInterrupts();
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111 /* Start the first task executing. */
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112 vPortStartFirstTask();
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116 /*-----------------------------------------------------------*/
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118 void vPortEndScheduler( void )
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120 /* Not implemented as there is nothing to return to. */
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122 /*-----------------------------------------------------------*/
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124 void vPortEnterCritical( void )
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126 if( ulCriticalNesting == 0UL )
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128 /* Guard against context switches being pended simultaneously with a
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129 critical section being entered. */
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132 portDISABLE_INTERRUPTS();
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133 if( MCF_INTC0_INTFRCL == 0UL )
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138 portENABLE_INTERRUPTS();
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142 ulCriticalNesting++;
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144 /*-----------------------------------------------------------*/
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146 void vPortExitCritical( void )
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148 ulCriticalNesting--;
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149 if( ulCriticalNesting == 0 )
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151 portENABLE_INTERRUPTS();
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154 /*-----------------------------------------------------------*/
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156 void vPortYieldHandler( void )
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158 unsigned long ulSavedInterruptMask;
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160 ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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161 /* Note this will clear all forced interrupts - this is done for speed. */
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162 MCF_INTC0_INTFRCL = 0;
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163 vTaskSwitchContext();
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164 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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