git.sur5r.net Git - freertos/blob - Source/portable/GCC/PPC405/port.c

   1 /*\r
   2         FreeRTOS.org V4.7.1 - Copyright (C) 2003-2008 Richard Barry.\r
   3 \r
   4         This file is part of the FreeRTOS.org distribution.\r
   5 \r
   6         FreeRTOS.org is free software; you can redistribute it and/or modify\r
   7         it under the terms of the GNU General Public License as published by\r
   8         the Free Software Foundation; either version 2 of the License, or\r
   9         (at your option) any later version.\r
  10 \r
  11         FreeRTOS.org is distributed in the hope that it will be useful,\r
  12         but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14         GNU General Public License for more details.\r
  15 \r
  16         You should have received a copy of the GNU General Public License\r
  17         along with FreeRTOS.org; if not, write to the Free Software\r
  18         Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
  19 \r
  20         A special exception to the GPL can be applied should you wish to distribute\r
  21         a combined work that includes FreeRTOS.org, without being obliged to provide\r
  22         the source code for any proprietary components.  See the licensing section \r
  23         of http://www.FreeRTOS.org for full details of how and when the exception\r
  24         can be applied.\r
  25 \r
  26         ***************************************************************************\r
  27 \r
  28         Please ensure to read the configuration and relevant port sections of the \r
  29         online documentation.\r
  30 \r
  31         +++ http://www.FreeRTOS.org +++\r
  32         Documentation, latest information, license and contact details.  \r
  33 \r
  34         +++ http://www.SafeRTOS.com +++\r
  35         A version that is certified for use in safety critical systems.\r
  36 \r
  37         +++ http://www.OpenRTOS.com +++\r
  38         Commercial support, development, porting, licensing and training services.\r
  39 \r
  40         ***************************************************************************\r
  41 */\r
  42 \r
  43 /*-----------------------------------------------------------\r
  44  * Implementation of functions defined in portable.h for the MicroBlaze port.\r
  45  *----------------------------------------------------------*/\r
  46 \r
  47 \r
  48 /* Scheduler includes. */\r
  49 #include "FreeRTOS.h"\r
  50 #include "task.h"\r
  51 \r
  52 /* Library includes. */\r
  53 #include "xexception_l.h"\r
  54 #include "xtime_l.h"\r
  55 \r
  56 /* Standard includes. */\r
  57 #include <string.h>\r
  58 \r
  59 /*-----------------------------------------------------------*/\r
  60 \r
  61 #define portCRITICAL_INTERRUPT_ENABLE   ( 1UL << 14UL )\r
  62 #define portEXTERNAL_INTERRUPT_ENABLE   ( 1UL << 16UL )\r
  63 #define portMACHINE_CHECK_ENABLE                ( 1UL << 19UL )\r
  64 #define portINITIAL_MSR         ( portCRITICAL_INTERRUPT_ENABLE | portEXTERNAL_INTERRUPT_ENABLE | portMACHINE_CHECK_ENABLE )\r
  65 \r
  66 /*\r
  67  */\r
  68 static void prvSetupTimerInterrupt( void );\r
  69 extern void vStartFirstTask( void );\r
  70 /*-----------------------------------------------------------*/\r
  71 \r
  72 static void prvTickISR( void );\r
  73 extern void vPortYield( void );\r
  74 \r
  75 /* \r
  76  * Initialise the stack of a task to look exactly as if a call to \r
  77  * portSAVE_CONTEXT had been made.\r
  78  * \r
  79  * See the header file portable.h.\r
  80  */\r
  81 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )\r
  82 {\r
  83         /* Place a known value at the bottom of the stack for debugging. */\r
  84         *pxTopOfStack = 0xDEADBEEF;\r
  85         *pxTopOfStack--;\r
  86 \r
  87         *pxTopOfStack = 0x10000001UL;;  /* R0. */\r
  88         pxTopOfStack--;\r
  89                                                                         /* SP. */\r
  90         *pxTopOfStack = 0x31313131UL;   /* R31. */\r
  91         pxTopOfStack--;\r
  92         *pxTopOfStack = 0x30303030UL;   /* R30. */\r
  93         pxTopOfStack--;\r
  94         *pxTopOfStack = 0x29292929UL;   /* R29. */\r
  95         pxTopOfStack--;\r
  96         *pxTopOfStack = 0x28282828UL;   /* R28. */\r
  97         pxTopOfStack--;\r
  98         *pxTopOfStack = 0x27272727UL;   /* R27. */\r
  99         pxTopOfStack--;\r
 100         *pxTopOfStack = 0x26262626UL;   /* R26. */\r
 101         pxTopOfStack--;\r
 102         *pxTopOfStack = 0x25252525UL;   /* R25. */\r
 103         pxTopOfStack--;\r
 104         *pxTopOfStack = 0x24242424UL;   /* R24. */\r
 105         pxTopOfStack--;\r
 106         *pxTopOfStack = 0x23232323UL;   /* R23. */\r
 107         pxTopOfStack--;\r
 108         *pxTopOfStack = 0x22222222UL;   /* R22. */\r
 109         pxTopOfStack--;\r
 110         *pxTopOfStack = 0x21212121UL;   /* R21. */\r
 111         pxTopOfStack--;\r
 112         *pxTopOfStack = 0x20202020UL;   /* R20. */\r
 113         pxTopOfStack--;\r
 114         *pxTopOfStack = 0x19191919UL;   /* R19. */\r
 115         pxTopOfStack--;\r
 116         *pxTopOfStack = 0x18181818UL;   /* R18. */\r
 117         pxTopOfStack--;\r
 118         *pxTopOfStack = 0x17171717UL;   /* R17. */\r
 119         pxTopOfStack--;\r
 120         *pxTopOfStack = 0x16161616UL;   /* R16. */\r
 121         pxTopOfStack--;\r
 122         *pxTopOfStack = 0x15151515UL;   /* R15. */\r
 123         pxTopOfStack--;\r
 124         *pxTopOfStack = 0x14141414UL;   /* R14. */\r
 125         pxTopOfStack--;\r
 126         *pxTopOfStack = 0x13131313UL;   /* R13. */\r
 127         pxTopOfStack--;\r
 128         *pxTopOfStack = 0x12121212UL;   /* R12. */\r
 129         pxTopOfStack--;\r
 130         *pxTopOfStack = 0x11111111UL;   /* R11. */\r
 131         pxTopOfStack--;\r
 132         *pxTopOfStack = 0x10101010UL;   /* R10. */\r
 133         pxTopOfStack--;\r
 134         *pxTopOfStack = 0x09090909UL;   /* R9. */\r
 135         pxTopOfStack--;\r
 136         *pxTopOfStack = 0x08080808UL;   /* R8. */\r
 137         pxTopOfStack--;\r
 138         *pxTopOfStack = 0x07070707UL;   /* R7. */\r
 139         pxTopOfStack--;\r
 140         *pxTopOfStack = 0x06060606UL;   /* R6. */\r
 141         pxTopOfStack--;\r
 142         *pxTopOfStack = 0x05050505UL;   /* R5. */\r
 143         pxTopOfStack--;\r
 144         *pxTopOfStack = 0x04040404UL;   /* R4. */\r
 145         pxTopOfStack--;\r
 146         *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;\r
 147         pxTopOfStack--;\r
 148         *pxTopOfStack = 0x02020202UL;   /* R2. */\r
 149         pxTopOfStack--;\r
 150         *pxTopOfStack = 0x00000000;             /* CR. */\r
 151         pxTopOfStack--;\r
 152         *pxTopOfStack = 0x00000000;             /* XER. */\r
 153         pxTopOfStack--;\r
 154         *pxTopOfStack = 0x00000000;             /* LR. */\r
 155         pxTopOfStack--;\r
 156         *pxTopOfStack = 0x00000000;             /* CTR. */\r
 157         pxTopOfStack--;\r
 158         *pxTopOfStack = 0x00000000;             /* USPRG0. */\r
 159         pxTopOfStack--;\r
 160         *pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* SRR0. */\r
 161         pxTopOfStack--;\r
 162         *pxTopOfStack = portINITIAL_MSR;/* SRR1. */\r
 163         pxTopOfStack--;\r
 164 \r
 165         return pxTopOfStack;\r
 166 }\r
 167 /*-----------------------------------------------------------*/\r
 168 \r
 169 portBASE_TYPE xPortStartScheduler( void )\r
 170 {\r
 171 extern void *pxCurrentTCB;\r
 172 \r
 173         prvSetupTimerInterrupt();\r
 174         vStartFirstTask();\r
 175         \r
 176         /* Should not get here as the tasks are now running! */\r
 177         return pdFALSE;\r
 178 }\r
 179 /*-----------------------------------------------------------*/\r
 180 \r
 181 void vPortEndScheduler( void )\r
 182 {\r
 183         /* Not implemented. */\r
 184 }\r
 185 /*-----------------------------------------------------------*/\r
 186 \r
 187 /*\r
 188  * Hardware initialisation to generate the RTOS tick.   \r
 189  */\r
 190 static void prvSetupTimerInterrupt( void )\r
 191 {\r
 192 const unsigned portLONG ulInterval = ( ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL );\r
 193 \r
 194         XExc_Init();\r
 195         XExc_mDisableExceptions( XEXC_NON_CRITICAL ) ;  \r
 196         XExc_RegisterHandler( XEXC_ID_PIT_INT, ( XExceptionHandler ) prvTickISR, ( void * ) 0 );\r
 197         XExc_RegisterHandler( XEXC_ID_SYSTEM_CALL, ( XExceptionHandler ) vPortYield, ( void * ) 0 );\r
 198 \r
 199         XTime_PITEnableAutoReload();\r
 200         XTime_PITEnableInterrupt();\r
 201         XTime_PITSetInterval( ulInterval );\r
 202         XTime_PITEnableInterrupt();\r
 203         \r
 204         XExc_mEnableExceptions( XEXC_NON_CRITICAL ) ;\r
 205 }\r
 206 /*-----------------------------------------------------------*/\r
 207 \r
 208 static void prvTickISR( void )\r
 209 {\r
 210 static unsigned portLONG ulTicks = 0;\r
 211 \r
 212         ulTicks++;\r
 213         if( ulTicks >= 1000 )\r
 214         {\r
 215                 vParTestToggleLED( 0 );\r
 216                 ulTicks = 0;\r
 217         }\r
 218         XTime_PITClearInterrupt();\r
 219         \r
 220         #if configUSE_PREEMPTION == 1\r
 221         #endif\r
 222 }\r
 223 /*-----------------------------------------------------------*/\r
 224 \r
 225 \r
 226 \r
 227 \r