begriffs open source - cmsis-freertos/blob - Source/portable/IAR/RX600/port.c

   1 /*
   2  * FreeRTOS Kernel V10.4.6
   3  * Copyright (C) 2021 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   4  *
   5  * SPDX-License-Identifier: MIT
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   8  * this software and associated documentation files (the "Software"), to deal in
   9  * the Software without restriction, including without limitation the rights to
  10  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
  11  * the Software, and to permit persons to whom the Software is furnished to do so,
  12  * subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in all
  15  * copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
  19  * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
  20  * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
  21  * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * https://www.FreeRTOS.org
  25  * https://github.com/FreeRTOS
  26  *
  27  */
  28
  29 /*-----------------------------------------------------------
  30  * Implementation of functions defined in portable.h for the SH2A port.
  31  *----------------------------------------------------------*/
  32
  33 /* Scheduler includes. */
  34 #include "FreeRTOS.h"
  35 #include "task.h"
  36
  37 /* Library includes. */
  38 #include "string.h"
  39
  40 /* Hardware specifics. */
  41 #include <iorx62n.h>
  42
  43 /*-----------------------------------------------------------*/
  44
  45 /* Tasks should start with interrupts enabled and in Supervisor mode, therefore
  46 PSW is set with U and I set, and PM and IPL clear. */
  47 #define portINITIAL_PSW  ( ( StackType_t ) 0x00030000 )
  48 #define portINITIAL_FPSW        ( ( StackType_t ) 0x00000100 )
  49
  50 /*-----------------------------------------------------------*/
  51
  52 /*
  53  * Function to start the first task executing - written in asm code as direct
  54  * access to registers is required.
  55  */
  56 extern void prvStartFirstTask( void );
  57
  58 /*
  59  * The tick ISR handler.  The peripheral used is configured by the application
  60  * via a hook/callback function.
  61  */
  62 __interrupt void vTickISR( void );
  63
  64 /*-----------------------------------------------------------*/
  65
  66 extern void *pxCurrentTCB;
  67
  68 /*-----------------------------------------------------------*/
  69
  70 /*
  71  * See header file for description.
  72  */
  73 StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )
  74 {
  75         /* R0 is not included as it is the stack pointer. */
  76
  77         *pxTopOfStack = 0x00;
  78         pxTopOfStack--;
  79         *pxTopOfStack = portINITIAL_PSW;
  80         pxTopOfStack--;
  81         *pxTopOfStack = ( StackType_t ) pxCode;
  82
  83         /* When debugging it can be useful if every register is set to a known
  84         value.  Otherwise code space can be saved by just setting the registers
  85         that need to be set. */
  86         #ifdef USE_FULL_REGISTER_INITIALISATION
  87         {
  88                 pxTopOfStack--;
  89                 *pxTopOfStack = 0xffffffff;     /* r15. */
  90                 pxTopOfStack--;
  91                 *pxTopOfStack = 0xeeeeeeee;
  92                 pxTopOfStack--;
  93                 *pxTopOfStack = 0xdddddddd;
  94                 pxTopOfStack--;
  95                 *pxTopOfStack = 0xcccccccc;
  96                 pxTopOfStack--;
  97                 *pxTopOfStack = 0xbbbbbbbb;
  98                 pxTopOfStack--;
  99                 *pxTopOfStack = 0xaaaaaaaa;
 100                 pxTopOfStack--;
 101                 *pxTopOfStack = 0x99999999;
 102                 pxTopOfStack--;
 103                 *pxTopOfStack = 0x88888888;
 104                 pxTopOfStack--;
 105                 *pxTopOfStack = 0x77777777;
 106                 pxTopOfStack--;
 107                 *pxTopOfStack = 0x66666666;
 108                 pxTopOfStack--;
 109                 *pxTopOfStack = 0x55555555;
 110                 pxTopOfStack--;
 111                 *pxTopOfStack = 0x44444444;
 112                 pxTopOfStack--;
 113                 *pxTopOfStack = 0x33333333;
 114                 pxTopOfStack--;
 115                 *pxTopOfStack = 0x22222222;
 116                 pxTopOfStack--;
 117         }
 118         #else
 119         {
 120                 pxTopOfStack -= 15;
 121         }
 122         #endif
 123
 124         *pxTopOfStack = ( StackType_t ) pvParameters; /* R1 */
 125         pxTopOfStack--;
 126         *pxTopOfStack = portINITIAL_FPSW;
 127         pxTopOfStack--;
 128         *pxTopOfStack = 0x12345678; /* Accumulator. */
 129         pxTopOfStack--;
 130         *pxTopOfStack = 0x87654321; /* Accumulator. */
 131
 132         return pxTopOfStack;
 133 }
 134 /*-----------------------------------------------------------*/
 135
 136 BaseType_t xPortStartScheduler( void )
 137 {
 138 extern void vApplicationSetupTimerInterrupt( void );
 139
 140         /* Use pxCurrentTCB just so it does not get optimised away. */
 141         if( pxCurrentTCB != NULL )
 142         {
 143                 /* Call an application function to set up the timer that will generate the
 144                 tick interrupt.  This way the application can decide which peripheral to
 145                 use.  A demo application is provided to show a suitable example. */
 146                 vApplicationSetupTimerInterrupt();
 147
 148                 /* Enable the software interrupt. */
 149                 _IEN( _ICU_SWINT ) = 1;
 150
 151                 /* Ensure the software interrupt is clear. */
 152                 _IR( _ICU_SWINT ) = 0;
 153
 154                 /* Ensure the software interrupt is set to the kernel priority. */
 155                 _IPR( _ICU_SWINT ) = configKERNEL_INTERRUPT_PRIORITY;
 156
 157                 /* Start the first task. */
 158                 prvStartFirstTask();
 159         }
 160
 161         /* Should not get here. */
 162         return pdFAIL;
 163 }
 164 /*-----------------------------------------------------------*/
 165
 166 #pragma vector = configTICK_VECTOR
 167 __interrupt void vTickISR( void )
 168 {
 169         /* Re-enable interrupts. */
 170         __enable_interrupt();
 171
 172         /* Increment the tick, and perform any processing the new tick value
 173         necessitates. */
 174         __set_interrupt_level( configMAX_SYSCALL_INTERRUPT_PRIORITY );
 175         {
 176                 if( xTaskIncrementTick() != pdFALSE )
 177                 {
 178                         taskYIELD();
 179                 }
 180         }
 181         __set_interrupt_level( configKERNEL_INTERRUPT_PRIORITY );
 182 }
 183 /*-----------------------------------------------------------*/
 184
 185 void vPortEndScheduler( void )
 186 {
 187         /* Not implemented in ports where there is nothing to return to.
 188         Artificially force an assert. */
 189         configASSERT( pxCurrentTCB == NULL );
 190 }
 191 /*-----------------------------------------------------------*/
 192
 193
 194