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

   1 /*\r
   2     FreeRTOS V8.2.0rc1 - 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     This file is part of the FreeRTOS distribution.\r
   8 \r
   9     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  10     the terms of the GNU General Public License (version 2) as published by the\r
  11     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  12 \r
  13     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  14     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  15     >>!   obliged to provide the source code for proprietary components     !<<\r
  16     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  17 \r
  18     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  19     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  20     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
  21     link: http://www.freertos.org/a00114.html\r
  22 \r
  23     1 tab == 4 spaces!\r
  24 \r
  25     ***************************************************************************\r
  26      *                                                                       *\r
  27      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  28      *    not run, what could be wrong?".  Have you defined configASSERT()?  *\r
  29      *                                                                       *\r
  30      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  31      *                                                                       *\r
  32     ***************************************************************************\r
  33 \r
  34     ***************************************************************************\r
  35      *                                                                       *\r
  36      *    FreeRTOS provides completely free yet professionally developed,    *\r
  37      *    robust, strictly quality controlled, supported, and cross          *\r
  38      *    platform software that is more than just the market leader, it     *\r
  39      *    is the industry's de facto standard.                               *\r
  40      *                                                                       *\r
  41      *    Help yourself get started quickly while simultaneously helping     *\r
  42      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
  43      *    tutorial book, reference manual, or both:                          *\r
  44      *    http://www.FreeRTOS.org/Documentation                              *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     ***************************************************************************\r
  49      *                                                                       *\r
  50      *   Investing in training allows your team to be as productive as       *\r
  51      *   possible as early as possible, lowering your overall development    *\r
  52      *   cost, and enabling you to bring a more robust product to market     *\r
  53      *   earlier than would otherwise be possible.  Richard Barry is both    *\r
  54      *   the architect and key author of FreeRTOS, and so also the world's   *\r
  55      *   leading authority on what is the world's most popular real time     *\r
  56      *   kernel for deeply embedded MCU designs.  Obtaining your training    *\r
  57      *   from Richard ensures your team will gain directly from his in-depth *\r
  58      *   product knowledge and years of usage experience.  Contact Real Time *\r
  59      *   Engineers Ltd to enquire about the FreeRTOS Masterclass, presented  *\r
  60      *   by Richard Barry:  http://www.FreeRTOS.org/contact\r
  61      *                                                                       *\r
  62     ***************************************************************************\r
  63 \r
  64     ***************************************************************************\r
  65      *                                                                       *\r
  66      *    You are receiving this top quality software for free.  Please play *\r
  67      *    fair and reciprocate by reporting any suspected issues and         *\r
  68      *    participating in the community forum:                              *\r
  69      *    http://www.FreeRTOS.org/support                                    *\r
  70      *                                                                       *\r
  71      *    Thank you!                                                         *\r
  72      *                                                                       *\r
  73     ***************************************************************************\r
  74 \r
  75     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  76     license and Real Time Engineers Ltd. contact details.\r
  77 \r
  78     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  79     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  80     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  81 \r
  82     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
  83     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
  84 \r
  85     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  86     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  87     licenses offer ticketed support, indemnification and commercial middleware.\r
  88 \r
  89     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  90     engineered and independently SIL3 certified version for use in safety and\r
  91     mission critical applications that require provable dependability.\r
  92 \r
  93     1 tab == 4 spaces!\r
  94 */\r
  95 \r
  96 /* Kernel includes. */\r
  97 #include "FreeRTOS.h"\r
  98 #include "task.h"\r
  99 \r
 100 \r
 101 #define portINITIAL_FORMAT_VECTOR               ( ( StackType_t ) 0x4000 )\r
 102 \r
 103 /* Supervisor mode set. */\r
 104 #define portINITIAL_STATUS_REGISTER             ( ( StackType_t ) 0x2000)\r
 105 \r
 106 /* Used to keep track of the number of nested calls to taskENTER_CRITICAL().  This\r
 107 will be set to 0 prior to the first task being started. */\r
 108 static uint32_t ulCriticalNesting = 0x9999UL;\r
 109 \r
 110 \r
 111 #define portSAVE_CONTEXT()                              \\r
 112         lea.l           (-60, %sp), %sp;                \\r
 113         movem.l         %d0-%fp, (%sp);                 \\r
 114         move.l          pxCurrentTCB, %a0;              \\r
 115         move.l          %sp, (%a0);\r
 116 \r
 117 #define portRESTORE_CONTEXT()                   \\r
 118         move.l          pxCurrentTCB, %a0;              \\r
 119         move.l          (%a0), %sp;                             \\r
 120         movem.l         (%sp), %d0-%fp;                 \\r
 121         lea.l           %sp@(60), %sp;                  \\r
 122         rte\r
 123 \r
 124 \r
 125 \r
 126 /*-----------------------------------------------------------*/\r
 127 \r
 128 StackType_t *pxPortInitialiseStack( StackType_t * pxTopOfStack, TaskFunction_t pxCode, void *pvParameters )\r
 129 {\r
 130         *pxTopOfStack = ( StackType_t ) pvParameters;\r
 131         pxTopOfStack--;\r
 132 \r
 133         *pxTopOfStack = (StackType_t) 0xDEADBEEF;\r
 134         pxTopOfStack--;\r
 135 \r
 136         /* Exception stack frame starts with the return address. */\r
 137         *pxTopOfStack = ( StackType_t ) pxCode;\r
 138         pxTopOfStack--;\r
 139 \r
 140         *pxTopOfStack = ( portINITIAL_FORMAT_VECTOR << 16UL ) | ( portINITIAL_STATUS_REGISTER );\r
 141         pxTopOfStack--;\r
 142 \r
 143         *pxTopOfStack = ( StackType_t ) 0x0; /*FP*/\r
 144         pxTopOfStack -= 14; /* A5 to D0. */\r
 145 \r
 146     return pxTopOfStack;\r
 147 }\r
 148 /*-----------------------------------------------------------*/\r
 149 \r
 150 BaseType_t xPortStartScheduler( void )\r
 151 {\r
 152 extern void vPortStartFirstTask( void );\r
 153 \r
 154         ulCriticalNesting = 0UL;\r
 155 \r
 156         /* Configure the interrupts used by this port. */\r
 157         vApplicationSetupInterrupts();\r
 158 \r
 159         /* Start the first task executing. */\r
 160         vPortStartFirstTask();\r
 161 \r
 162         return pdFALSE;\r
 163 }\r
 164 /*-----------------------------------------------------------*/\r
 165 \r
 166 void vPortEndScheduler( void )\r
 167 {\r
 168         /* Not implemented as there is nothing to return to. */\r
 169 }\r
 170 /*-----------------------------------------------------------*/\r
 171 \r
 172 void vPortEnterCritical( void )\r
 173 {\r
 174         if( ulCriticalNesting == 0UL )\r
 175         {\r
 176                 /* Guard against context switches being pended simultaneously with a\r
 177                 critical section being entered. */\r
 178                 do\r
 179                 {\r
 180                         portDISABLE_INTERRUPTS();\r
 181                         if( MCF_INTC0_INTFRCH == 0UL )\r
 182                         {\r
 183                                 break;\r
 184                         }\r
 185 \r
 186                         portENABLE_INTERRUPTS();\r
 187 \r
 188                 } while( 1 );\r
 189         }\r
 190         ulCriticalNesting++;\r
 191 }\r
 192 /*-----------------------------------------------------------*/\r
 193 \r
 194 void vPortExitCritical( void )\r
 195 {\r
 196         ulCriticalNesting--;\r
 197         if( ulCriticalNesting == 0 )\r
 198         {\r
 199                 portENABLE_INTERRUPTS();\r
 200         }\r
 201 }\r
 202 /*-----------------------------------------------------------*/\r
 203 \r
 204 void vPortYieldHandler( void )\r
 205 {\r
 206 uint32_t ulSavedInterruptMask;\r
 207 \r
 208         ulSavedInterruptMask = portSET_INTERRUPT_MASK_FROM_ISR();\r
 209                 /* Note this will clear all forced interrupts - this is done for speed. */\r
 210                 MCF_INTC0_INTFRCL = 0;\r
 211                 vTaskSwitchContext();\r
 212         portCLEAR_INTERRUPT_MASK_FROM_ISR( ulSavedInterruptMask );\r
 213 }\r
 214 /*-----------------------------------------------------------*/\r
 215 \r