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 PPC405 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 "xtime_l.h"\r
  54 \r
  55 /* Standard includes. */\r
  56 #include <string.h>\r
  57 \r
  58 /*-----------------------------------------------------------*/\r
  59 \r
  60 #define portCRITICAL_INTERRUPT_ENABLE   ( 0UL << 17UL )\r
  61 #define portEXTERNAL_INTERRUPT_ENABLE   ( 1UL << 15UL )\r
  62 #define portMACHINE_CHECK_ENABLE                ( 0UL << 12UL )\r
  63 #define portINITIAL_MSR         ( portCRITICAL_INTERRUPT_ENABLE | portEXTERNAL_INTERRUPT_ENABLE | portMACHINE_CHECK_ENABLE )\r
  64 \r
  65 /*\r
  66  */\r
  67 static void prvSetupTimerInterrupt( void );\r
  68 extern void vPortTickISR( void );\r
  69 extern void vPortYield( void );\r
  70 extern void vPortStartFirstTask( void );\r
  71 \r
  72 /* \r
  73  * Initialise the stack of a task to look exactly as if a call to \r
  74  * portSAVE_CONTEXT had been made.\r
  75  * \r
  76  * See the header file portable.h.\r
  77  */\r
  78 portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )\r
  79 {\r
  80         /* Place a known value at the bottom of the stack for debugging. */\r
  81         *pxTopOfStack = 0xDEADBEEF;\r
  82         *pxTopOfStack--;\r
  83 \r
  84         /* EABI stack frame. */\r
  85         *pxTopOfStack = 0x31313131UL;   /* R31. */\r
  86         pxTopOfStack--;\r
  87         *pxTopOfStack = 0x30303030UL;   /* R30. */\r
  88         pxTopOfStack--;\r
  89         *pxTopOfStack = 0x29292929UL;   /* R29. */\r
  90         pxTopOfStack--;\r
  91         *pxTopOfStack = 0x28282828UL;   /* R28. */\r
  92         pxTopOfStack--;\r
  93         *pxTopOfStack = 0x27272727UL;   /* R27. */\r
  94         pxTopOfStack--;\r
  95         *pxTopOfStack = 0x26262626UL;   /* R26. */\r
  96         pxTopOfStack--;\r
  97         *pxTopOfStack = 0x25252525UL;   /* R25. */\r
  98         pxTopOfStack--;\r
  99         *pxTopOfStack = 0x24242424UL;   /* R24. */\r
 100         pxTopOfStack--;\r
 101         *pxTopOfStack = 0x23232323UL;   /* R23. */\r
 102         pxTopOfStack--;\r
 103         *pxTopOfStack = 0x22222222UL;   /* R22. */\r
 104         pxTopOfStack--;\r
 105         *pxTopOfStack = 0x21212121UL;   /* R21. */\r
 106         pxTopOfStack--;\r
 107         *pxTopOfStack = 0x20202020UL;   /* R20. */\r
 108         pxTopOfStack--;\r
 109         *pxTopOfStack = 0x19191919UL;   /* R19. */\r
 110         pxTopOfStack--;\r
 111         *pxTopOfStack = 0x18181818UL;   /* R18. */\r
 112         pxTopOfStack--;\r
 113         *pxTopOfStack = 0x17171717UL;   /* R17. */\r
 114         pxTopOfStack--;\r
 115         *pxTopOfStack = 0x16161616UL;   /* R16. */\r
 116         pxTopOfStack--;\r
 117         *pxTopOfStack = 0x15151515UL;   /* R15. */\r
 118         pxTopOfStack--;\r
 119         *pxTopOfStack = 0x14141414UL;   /* R14. */\r
 120         pxTopOfStack--;\r
 121         *pxTopOfStack = 0x13131313UL;   /* R13. */\r
 122         pxTopOfStack--;\r
 123         *pxTopOfStack = 0x12121212UL;   /* R12. */\r
 124         pxTopOfStack--;\r
 125         *pxTopOfStack = 0x11111111UL;   /* R11. */\r
 126         pxTopOfStack--;\r
 127         *pxTopOfStack = 0x10101010UL;   /* R10. */\r
 128         pxTopOfStack--;\r
 129         *pxTopOfStack = 0x09090909UL;   /* R9. */\r
 130         pxTopOfStack--;\r
 131         *pxTopOfStack = 0x08080808UL;   /* R8. */\r
 132         pxTopOfStack--;\r
 133         *pxTopOfStack = 0x07070707UL;   /* R7. */\r
 134         pxTopOfStack--;\r
 135         *pxTopOfStack = 0x06060606UL;   /* R6. */\r
 136         pxTopOfStack--;\r
 137         *pxTopOfStack = 0x05050505UL;   /* R5. */\r
 138         pxTopOfStack--;\r
 139         *pxTopOfStack = 0x04040404UL;   /* R4. */\r
 140         pxTopOfStack--;\r
 141         *pxTopOfStack = ( portSTACK_TYPE ) pvParameters;\r
 142         pxTopOfStack--;\r
 143         *pxTopOfStack = 0x02020202UL;   /* R2. */\r
 144         pxTopOfStack--;\r
 145         *pxTopOfStack = 0x10000001UL;;  /* R0. */\r
 146         pxTopOfStack--;\r
 147         *pxTopOfStack = 0x00000000UL;   /* USPRG0. */\r
 148         pxTopOfStack--;\r
 149         *pxTopOfStack = 0x00000000UL;   /* CR. */\r
 150         pxTopOfStack--;\r
 151         *pxTopOfStack = 0x00000000UL;   /* XER. */\r
 152         pxTopOfStack--;\r
 153         *pxTopOfStack = 0x00000000UL;   /* CTR. */\r
 154         pxTopOfStack--;\r
 155         *pxTopOfStack = ( portSTACK_TYPE ) vPortStartFirstTask; /* LR. */\r
 156         pxTopOfStack--;\r
 157         *pxTopOfStack = ( portSTACK_TYPE ) pxCode; /* SRR0. */\r
 158         pxTopOfStack--;\r
 159         *pxTopOfStack = portINITIAL_MSR;/* SRR1. */\r
 160         pxTopOfStack--;\r
 161         *pxTopOfStack = ( portSTACK_TYPE ) vPortStartFirstTask;/* Next LR. */\r
 162         pxTopOfStack--;\r
 163         *pxTopOfStack = 0x00000000UL;;/* Backchain. */\r
 164 //      pxTopOfStack--;\r
 165 \r
 166         return pxTopOfStack;\r
 167 }\r
 168 /*-----------------------------------------------------------*/\r
 169 \r
 170 portBASE_TYPE xPortStartScheduler( void )\r
 171 {\r
 172 extern void *pxCurrentTCB;\r
 173 \r
 174         XExc_Init();\r
 175         XExc_mDisableExceptions( XEXC_NON_CRITICAL ) ;  \r
 176 \r
 177         prvSetupTimerInterrupt();\r
 178 \r
 179         XExc_RegisterHandler( XEXC_ID_SYSTEM_CALL, ( XExceptionHandler ) vPortYield, ( void * ) 0 );\r
 180 \r
 181 //      XExc_mEnableExceptions( XEXC_NON_CRITICAL );\r
 182 \r
 183         vPortStartFirstTask();\r
 184 \r
 185         /* Should not get here as the tasks are now running! */\r
 186         return pdFALSE;\r
 187 }\r
 188 /*-----------------------------------------------------------*/\r
 189 \r
 190 void vPortEndScheduler( void )\r
 191 {\r
 192         /* Not implemented. */\r
 193 }\r
 194 /*-----------------------------------------------------------*/\r
 195 \r
 196 /*\r
 197  * Hardware initialisation to generate the RTOS tick.   \r
 198  */\r
 199 static void prvTickISR( void );\r
 200 static void prvSetupTimerInterrupt( void )\r
 201 {\r
 202 const unsigned portLONG ulInterval = ( ( configCPU_CLOCK_HZ / configTICK_RATE_HZ ) - 1UL );\r
 203 \r
 204         XTime_PITClearInterrupt();\r
 205         XTime_FITClearInterrupt();\r
 206         XTime_WDTClearInterrupt();\r
 207         XTime_WDTDisableInterrupt();\r
 208         XTime_FITDisableInterrupt();\r
 209 \r
 210         XExc_RegisterHandler( XEXC_ID_PIT_INT, ( XExceptionHandler ) vPortTickISR, ( void * ) 0 );\r
 211 \r
 212         XTime_PITEnableAutoReload();\r
 213         XTime_PITSetInterval( ulInterval );\r
 214         XTime_PITEnableInterrupt();\r
 215 }\r
 216 /*-----------------------------------------------------------*/\r
 217 \r
 218 static void prvTickISR( void )\r
 219 {\r
 220 static unsigned portLONG ulTicks = 0;\r
 221 \r
 222         ulTicks++;\r
 223         if( ulTicks >= 1000 )\r
 224         {\r
 225                 vParTestToggleLED( 0 );\r
 226                 ulTicks = 0;\r
 227         }\r
 228         XTime_PITClearInterrupt();\r
 229 }\r
 230 /*-----------------------------------------------------------*/\r
 231 \r