2 FreeRTOS.org V5.0.3 - Copyright (C) 2003-2008 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 2 of the License, or
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9 (at your option) any later version.
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11 FreeRTOS.org is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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16 You should have received a copy of the GNU General Public License
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17 along with FreeRTOS.org; if not, write to the Free Software
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18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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20 A special exception to the GPL can be applied should you wish to distribute
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21 a combined work that includes FreeRTOS.org, without being obliged to provide
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22 the source code for any proprietary components. See the licensing section
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23 of http://www.FreeRTOS.org for full details of how and when the exception
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26 ***************************************************************************
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27 ***************************************************************************
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29 * SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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30 * and even write all or part of your application on your behalf. *
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31 * See http://www.OpenRTOS.com for details of the services we provide to *
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32 * expedite your project. *
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34 ***************************************************************************
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35 ***************************************************************************
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37 Please ensure to read the configuration and relevant port sections of the
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38 online documentation.
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40 http://www.FreeRTOS.org - Documentation, latest information, license and
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43 http://www.SafeRTOS.com - A version that is certified for use in safety
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46 http://www.OpenRTOS.com - Commercial support, development, porting,
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47 licensing and training services.
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50 /* Kernel includes. */
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51 #include "FreeRTOS.h"
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54 #define portINITIAL_FORMAT_VECTOR ( ( portSTACK_TYPE ) 0x4000 )
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56 /* Supervisor mode set. */
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57 #define portINITIAL_STATUS_REGISTER ( ( portSTACK_TYPE ) 0x2000)
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59 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL(). This
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60 will be set to 0 prior to the first task being started. */
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61 static unsigned portLONG ulCriticalNesting = 0x9999UL;
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63 /*-----------------------------------------------------------*/
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65 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE * pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
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67 *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;
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70 *pxTopOfStack = (portSTACK_TYPE) 0xDEADBEEF;
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73 /* Exception stack frame starts with the return address. */
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74 *pxTopOfStack = ( portSTACK_TYPE ) pxCode;
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77 *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );
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80 *pxTopOfStack = ( portSTACK_TYPE ) 0x0; /*FP*/
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81 pxTopOfStack -= 14; /* A5 to D0. */
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83 return pxTopOfStack;
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85 /*-----------------------------------------------------------*/
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87 portBASE_TYPE xPortStartScheduler( void )
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89 extern void vPortStartFirstTask( void );
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91 ulCriticalNesting = 0UL;
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93 /* Configure the interrupts used by this port. */
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94 vApplicationSetupInterrupts();
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96 /* Start the first task executing. */
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97 vPortStartFirstTask();
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101 /*-----------------------------------------------------------*/
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103 void vPortEndScheduler( void )
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105 /* Not implemented as there is nothing to return to. */
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107 /*-----------------------------------------------------------*/
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109 void vPortEnterCritical( void )
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111 if( ulCriticalNesting == 0UL )
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113 /* Guard against context switches being pended simultaneously with a
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114 critical section being entered. */
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117 portDISABLE_INTERRUPTS();
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118 if( MCF_INTC0_INTFRCH == 0UL )
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123 portENABLE_INTERRUPTS();
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127 ulCriticalNesting++;
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129 /*-----------------------------------------------------------*/
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131 void vPortExitCritical( void )
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133 ulCriticalNesting--;
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134 if( ulCriticalNesting == 0 )
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136 portENABLE_INTERRUPTS();
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139 /*-----------------------------------------------------------*/
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141 void vPortYieldHandler( void )
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143 unsigned portLONG ulSavedInterruptMask;
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145 ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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146 /* Note this will clear all forced interrupts - this is done for speed. */
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147 MCF_INTC0_INTFRCH = 0;
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148 vTaskSwitchContext();
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149 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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