2 * FreeRTOS Kernel V10.0.0
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3 * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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6 * this software and associated documentation files (the "Software"), to deal in
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7 * the Software without restriction, including without limitation the rights to
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8 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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9 * the Software, and to permit persons to whom the Software is furnished to do so,
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10 * subject to the following conditions:
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12 * The above copyright notice and this permission notice shall be included in all
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13 * copies or substantial portions of the Software. If you wish to use our Amazon
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14 * FreeRTOS name, please do so in a fair use way that does not cause confusion.
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16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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18 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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19 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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20 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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23 * http://www.FreeRTOS.org
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24 * http://aws.amazon.com/freertos
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26 * 1 tab == 4 spaces!
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29 /* Kernel includes. */
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30 #include "FreeRTOS.h"
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33 #define portINITIAL_FORMAT_VECTOR ( ( StackType_t ) 0x4000 )
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35 /* Supervisor mode set. */
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36 #define portINITIAL_STATUS_REGISTER ( ( StackType_t ) 0x2000)
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38 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL(). This
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39 will be set to 0 prior to the first task being started. */
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40 static uint32_t ulCriticalNesting = 0x9999UL;
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42 /*-----------------------------------------------------------*/
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44 StackType_t *pxPortInitialiseStack( StackType_t * pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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46 *pxTopOfStack = ( StackType_t ) pvParameters;
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49 *pxTopOfStack = (StackType_t) 0xDEADBEEF;
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52 /* Exception stack frame starts with the return address. */
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53 *pxTopOfStack = ( StackType_t ) pxCode;
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56 *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );
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59 *pxTopOfStack = ( StackType_t ) 0x0; /*FP*/
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60 pxTopOfStack -= 14; /* A5 to D0. */
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62 return pxTopOfStack;
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64 /*-----------------------------------------------------------*/
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66 BaseType_t xPortStartScheduler( void )
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68 extern void vPortStartFirstTask( void );
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70 ulCriticalNesting = 0UL;
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72 /* Configure the interrupts used by this port. */
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73 vApplicationSetupInterrupts();
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75 /* Start the first task executing. */
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76 vPortStartFirstTask();
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80 /*-----------------------------------------------------------*/
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82 void vPortEndScheduler( void )
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84 /* Not implemented as there is nothing to return to. */
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86 /*-----------------------------------------------------------*/
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88 void vPortEnterCritical( void )
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90 if( ulCriticalNesting == 0UL )
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92 /* Guard against context switches being pended simultaneously with a
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93 critical section being entered. */
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96 portDISABLE_INTERRUPTS();
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97 if( MCF_INTC0_INTFRCL == 0UL )
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102 portENABLE_INTERRUPTS();
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106 ulCriticalNesting++;
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108 /*-----------------------------------------------------------*/
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110 void vPortExitCritical( void )
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112 ulCriticalNesting--;
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113 if( ulCriticalNesting == 0 )
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115 portENABLE_INTERRUPTS();
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118 /*-----------------------------------------------------------*/
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120 void vPortYieldHandler( void )
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122 uint32_t ulSavedInterruptMask;
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124 ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();
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125 /* Note this will clear all forced interrupts - this is done for speed. */
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126 MCF_INTC0_INTFRCL = 0;
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127 vTaskSwitchContext();
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128 portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );
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