git.sur5r.net Git - freertos/blob - FreeRTOS/Source/portable/CodeWarrior/ColdFire_V2/port.c

   1 /*\r
   2     FreeRTOS V8.0.0 - Copyright (C) 2014 Real Time Engineers Ltd. \r
   3     All rights reserved\r
   4 \r
   5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
   9      *    FreeRTOS provides completely free yet professionally developed,    *\r
  10      *    robust, strictly quality controlled, supported, and cross          *\r
  11      *    platform software that has become a de facto standard.             *\r
  12      *                                                                       *\r
  13      *    Help yourself get started quickly and support the FreeRTOS         *\r
  14      *    project by purchasing a FreeRTOS tutorial book, reference          *\r
  15      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *\r
  16      *                                                                       *\r
  17      *    Thank you!                                                         *\r
  18      *                                                                       *\r
  19     ***************************************************************************\r
  20 \r
  21     This file is part of the FreeRTOS distribution.\r
  22 \r
  23     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  24     the terms of the GNU General Public License (version 2) as published by the\r
  25     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  26 \r
  27     >>! NOTE: The modification to the GPL is included to allow you to distribute\r
  28     >>! a combined work that includes FreeRTOS without being obliged to provide\r
  29     >>! the source code for proprietary components outside of the FreeRTOS\r
  30     >>! kernel.\r
  31 \r
  32     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  33     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  34     FOR A PARTICULAR PURPOSE.  Full license text is available from the following\r
  35     link: http://www.freertos.org/a00114.html\r
  36 \r
  37     1 tab == 4 spaces!\r
  38 \r
  39     ***************************************************************************\r
  40      *                                                                       *\r
  41      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  42      *    not run, what could be wrong?"                                     *\r
  43      *                                                                       *\r
  44      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  49     license and Real Time Engineers Ltd. contact details.\r
  50 \r
  51     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  52     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  53     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  54 \r
  55     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  56     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  57     licenses offer ticketed support, indemnification and middleware.\r
  58 \r
  59     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  60     engineered and independently SIL3 certified version for use in safety and\r
  61     mission critical applications that require provable dependability.\r
  62 \r
  63     1 tab == 4 spaces!\r
  64 */\r
  65 \r
  66 /* Kernel includes. */\r
  67 #include "FreeRTOS.h"\r
  68 #include "task.h"\r
  69 \r
  70 \r
  71 #define portINITIAL_FORMAT_VECTOR               ( ( StackType_t ) 0x4000 )\r
  72 \r
  73 /* Supervisor mode set. */\r
  74 #define portINITIAL_STATUS_REGISTER             ( ( StackType_t ) 0x2000)\r
  75 \r
  76 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL().  This\r
  77 will be set to 0 prior to the first task being started. */\r
  78 static uint32_t ulCriticalNesting = 0x9999UL;\r
  79 \r
  80 \r
  81 #define portSAVE_CONTEXT()                              \\r
  82         lea.l           (-60, %sp), %sp;                \\r
  83         movem.l         %d0-%fp, (%sp);                 \\r
  84         move.l          pxCurrentTCB, %a0;              \\r
  85         move.l          %sp, (%a0);\r
  86 \r
  87 #define portRESTORE_CONTEXT()                   \\r
  88         move.l          pxCurrentTCB, %a0;              \\r
  89         move.l          (%a0), %sp;                             \\r
  90         movem.l         (%sp), %d0-%fp;                 \\r
  91         lea.l           %sp@(60), %sp;                  \\r
  92         rte\r
  93 \r
  94 \r
  95 \r
  96 /*-----------------------------------------------------------*/\r
  97 \r
  98 StackType_t *pxPortInitialiseStack( StackType_t * pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )\r
  99 {\r
 100         *pxTopOfStack = ( StackType_t ) pvParameters;\r
 101         pxTopOfStack--;\r
 102 \r
 103         *pxTopOfStack = (StackType_t) 0xDEADBEEF;\r
 104         pxTopOfStack--;\r
 105 \r
 106         /* Exception stack frame starts with the return address. */\r
 107         *pxTopOfStack = ( StackType_t ) pxCode;\r
 108         pxTopOfStack--;\r
 109 \r
 110         *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );\r
 111         pxTopOfStack--;\r
 112 \r
 113         *pxTopOfStack = ( StackType_t ) 0x0; /*FP*/\r
 114         pxTopOfStack -= 14; /* A5 to D0. */\r
 115 \r
 116     return pxTopOfStack;\r
 117 }\r
 118 /*-----------------------------------------------------------*/\r
 119 \r
 120 BaseType_t xPortStartScheduler( void )\r
 121 {\r
 122 extern void vPortStartFirstTask( void );\r
 123 \r
 124         ulCriticalNesting = 0UL;\r
 125 \r
 126         /* Configure the interrupts used by this port. */\r
 127         vApplicationSetupInterrupts();\r
 128 \r
 129         /* Start the first task executing. */\r
 130         vPortStartFirstTask();\r
 131 \r
 132         return pdFALSE;\r
 133 }\r
 134 /*-----------------------------------------------------------*/\r
 135 \r
 136 void vPortEndScheduler( void )\r
 137 {\r
 138         /* Not implemented as there is nothing to return to. */\r
 139 }\r
 140 /*-----------------------------------------------------------*/\r
 141 \r
 142 void vPortEnterCritical( void )\r
 143 {\r
 144         if( ulCriticalNesting == 0UL )\r
 145         {\r
 146                 /* Guard against context switches being pended simultaneously with a\r
 147                 critical section being entered. */\r
 148                 do\r
 149                 {\r
 150                         portDISABLE_INTERRUPTS();\r
 151                         if( MCF_INTC0_INTFRCH == 0UL )\r
 152                         {\r
 153                                 break;\r
 154                         }\r
 155 \r
 156                         portENABLE_INTERRUPTS();\r
 157 \r
 158                 } while( 1 );\r
 159         }\r
 160         ulCriticalNesting++;\r
 161 }\r
 162 /*-----------------------------------------------------------*/\r
 163 \r
 164 void vPortExitCritical( void )\r
 165 {\r
 166         ulCriticalNesting--;\r
 167         if( ulCriticalNesting == 0 )\r
 168         {\r
 169                 portENABLE_INTERRUPTS();\r
 170         }\r
 171 }\r
 172 /*-----------------------------------------------------------*/\r
 173 \r
 174 void vPortYieldHandler( void )\r
 175 {\r
 176 uint32_t ulSavedInterruptMask;\r
 177 \r
 178         ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();\r
 179                 /* Note this will clear all forced interrupts - this is done for speed. */\r
 180                 MCF_INTC0_INTFRCL = 0;\r
 181                 vTaskSwitchContext();\r
 182         portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );\r
 183 }\r
 184 /*-----------------------------------------------------------*/\r
 185 \r