2 * FreeRTOS Kernel V10.1.1
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3 * Copyright (C) 2018 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.
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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17 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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18 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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19 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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20 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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22 * http://www.FreeRTOS.org
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23 * http://aws.amazon.com/freertos
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25 * 1 tab == 4 spaces!
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28 /*-----------------------------------------------------------
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29 * Implementation of functions defined in portable.h for the SH2A port.
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30 *----------------------------------------------------------*/
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32 /* Scheduler includes. */
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33 #include "FreeRTOS.h"
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36 /* Library includes. */
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39 /* Hardware specifics. */
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40 #include <machine.h>
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42 /*-----------------------------------------------------------*/
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44 /* Tasks should start with interrupts enabled and in Supervisor mode, therefore
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45 PSW is set with U and I set, and PM and IPL clear. */
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46 #define portINITIAL_PSW ( ( StackType_t ) 0x00030000 )
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47 #define portINITIAL_FPSW ( ( StackType_t ) 0x00000100 )
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49 /*-----------------------------------------------------------*/
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52 * Function to start the first task executing - written in asm code as direct
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53 * access to registers is required.
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55 extern void prvStartFirstTask( void );
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58 * The tick ISR handler. The peripheral used is configured by the application
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59 * via a hook/callback function.
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61 __interrupt void vTickISR( void );
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63 /*-----------------------------------------------------------*/
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65 extern void *pxCurrentTCB;
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67 /*-----------------------------------------------------------*/
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70 * See header file for description.
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72 StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
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74 /* R0 is not included as it is the stack pointer. */
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76 *pxTopOfStack = 0x00;
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78 *pxTopOfStack = portINITIAL_PSW;
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80 *pxTopOfStack = ( StackType_t ) pxCode;
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82 /* When debugging it can be useful if every register is set to a known
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83 value. Otherwise code space can be saved by just setting the registers
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84 that need to be set. */
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85 #ifdef USE_FULL_REGISTER_INITIALISATION
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88 *pxTopOfStack = 0xffffffff; /* r15. */
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90 *pxTopOfStack = 0xeeeeeeee;
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92 *pxTopOfStack = 0xdddddddd;
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94 *pxTopOfStack = 0xcccccccc;
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96 *pxTopOfStack = 0xbbbbbbbb;
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98 *pxTopOfStack = 0xaaaaaaaa;
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100 *pxTopOfStack = 0x99999999;
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102 *pxTopOfStack = 0x88888888;
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104 *pxTopOfStack = 0x77777777;
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106 *pxTopOfStack = 0x66666666;
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108 *pxTopOfStack = 0x55555555;
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110 *pxTopOfStack = 0x44444444;
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112 *pxTopOfStack = 0x33333333;
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114 *pxTopOfStack = 0x22222222;
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119 pxTopOfStack -= 15;
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123 *pxTopOfStack = ( StackType_t ) pvParameters; /* R1 */
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125 *pxTopOfStack = portINITIAL_FPSW;
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127 *pxTopOfStack = 0x11111111; /* Accumulator 0. */
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129 *pxTopOfStack = 0x22222222; /* Accumulator 0. */
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131 *pxTopOfStack = 0x33333333; /* Accumulator 0. */
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133 *pxTopOfStack = 0x44444444; /* Accumulator 1. */
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135 *pxTopOfStack = 0x55555555; /* Accumulator 1. */
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137 *pxTopOfStack = 0x66666666; /* Accumulator 1. */
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139 return pxTopOfStack;
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141 /*-----------------------------------------------------------*/
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143 BaseType_t xPortStartScheduler( void )
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145 extern void vApplicationSetupTimerInterrupt( void );
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147 /* Use pxCurrentTCB just so it does not get optimised away. */
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148 if( pxCurrentTCB != NULL )
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150 /* Call an application function to set up the timer that will generate the
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151 tick interrupt. This way the application can decide which peripheral to
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152 use. A demo application is provided to show a suitable example. */
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153 vApplicationSetupTimerInterrupt();
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155 /* Enable the software interrupt. */
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156 _IEN( _ICU_SWINT ) = 1;
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158 /* Ensure the software interrupt is clear. */
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159 _IR( _ICU_SWINT ) = 0;
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161 /* Ensure the software interrupt is set to the kernel priority. */
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162 _IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;
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164 /* Start the first task. */
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165 prvStartFirstTask();
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168 /* Should not get here. */
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171 /*-----------------------------------------------------------*/
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173 #pragma vector = configTICK_VECTOR
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174 __interrupt void vTickISR( void )
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176 /* Re-enable interrupts. */
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177 __enable_interrupt();
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179 /* Increment the tick, and perform any processing the new tick value
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181 __set_interrupt_level( configMAX_SYSCALL_INTERRUPT_PRIORITY );
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183 if( xTaskIncrementTick() != pdFALSE )
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188 __set_interrupt_level( configKERNEL_INTERRUPT_PRIORITY );
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190 /*-----------------------------------------------------------*/
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192 void vPortEndScheduler( void )
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194 /* Not implemented in ports where there is nothing to return to.
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195 Artificially force an assert. */
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196 configASSERT( pxCurrentTCB == NULL );
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198 /*-----------------------------------------------------------*/
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