git.sur5r.net Git - freertos/blob - Source/portable/CodeWarrior/HCS12/portmacro.h

   1 /*\r
   2         FreeRTOS V4.0.1 - Copyright (C) 2003-2006 Richard Barry.\r
   3 \r
   4         This file is part of the FreeRTOS distribution.\r
   5 \r
   6         FreeRTOS 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 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; 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, 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         See http://www.FreeRTOS.org for documentation, latest information, license \r
  28         and contact details.  Please ensure to read the configuration and relevant \r
  29         port sections of the online documentation.\r
  30         ***************************************************************************\r
  31 */\r
  32 \r
  33 \r
  34 #ifndef PORTMACRO_H\r
  35 #define PORTMACRO_H\r
  36 \r
  37 /*-----------------------------------------------------------\r
  38  * Port specific definitions.  \r
  39  *\r
  40  * The settings in this file configure FreeRTOS correctly for the\r
  41  * given hardware and compiler.\r
  42  *\r
  43  * These settings should not be altered.\r
  44  *-----------------------------------------------------------\r
  45  */\r
  46 \r
  47 /* Type definitions. */\r
  48 #define portCHAR                char\r
  49 #define portFLOAT               float\r
  50 #define portDOUBLE              double\r
  51 #define portLONG                long\r
  52 #define portSHORT               short\r
  53 #define portSTACK_TYPE  unsigned portCHAR\r
  54 #define portBASE_TYPE   char\r
  55 \r
  56 #if( configUSE_16_BIT_TICKS == 1 )\r
  57         typedef unsigned portSHORT portTickType;\r
  58         #define portMAX_DELAY ( portTickType ) 0xffff\r
  59 #else\r
  60         typedef unsigned portLONG portTickType;\r
  61         #define portMAX_DELAY ( portTickType ) 0xffffffff\r
  62 #endif\r
  63 /*-----------------------------------------------------------*/\r
  64 \r
  65 /* Hardware specifics. */\r
  66 #define portBYTE_ALIGNMENT                      1\r
  67 #define portSTACK_GROWTH                        ( -1 )\r
  68 #define portTICK_RATE_MS                        ( ( portTickType ) 1000 / configTICK_RATE_HZ )          \r
  69 #define portYIELD()                                     __asm( "swi" );\r
  70 #define portNOP()                                       __asm( "nop" );\r
  71 /*-----------------------------------------------------------*/\r
  72 \r
  73 /* Critical section handling. */\r
  74 #define portENABLE_INTERRUPTS()                         __asm( "cli" )  \r
  75 #define portDISABLE_INTERRUPTS()                        __asm( "sei" )\r
  76 \r
  77 /*\r
  78  * Disable interrupts before incrementing the count of critical section nesting.\r
  79  * The nesting count is maintained so we know when interrupts should be\r
  80  * re-enabled.  Once interrupts are disabled the nesting count can be accessed\r
  81  * directly.  Each task maintains its own nesting count.\r
  82  */\r
  83 #define portENTER_CRITICAL()                                                                    \\r
  84 {                                                                                                                               \\r
  85         extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
  86                                                                                                                                 \\r
  87         portDISABLE_INTERRUPTS();                                                                       \\r
  88         uxCriticalNesting++;                                                                            \\r
  89 }\r
  90 \r
  91 /*\r
  92  * Interrupts are disabled so we can access the nesting count directly.  If the\r
  93  * nesting is found to be 0 (no nesting) then we are leaving the critical \r
  94  * section and interrupts can be re-enabled.\r
  95  */\r
  96 #define  portEXIT_CRITICAL()                                                                    \\r
  97 {                                                                                                                               \\r
  98         extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
  99                                                                                                                                 \\r
 100         uxCriticalNesting--;                                                                            \\r
 101         if( uxCriticalNesting == 0 )                                                            \\r
 102         {                                                                                                                       \\r
 103                 portENABLE_INTERRUPTS();                                                                \\r
 104         }                                                                                                                       \\r
 105 }\r
 106 /*-----------------------------------------------------------*/\r
 107 \r
 108 /* Task utilities. */\r
 109 \r
 110 /* \r
 111  * These macros are very simple as the processor automatically saves and \r
 112  * restores its registers as interrupts are entered and exited.  In\r
 113  * addition to the (automatically stacked) registers we also stack the \r
 114  * critical nesting count.  Each task maintains its own critical nesting\r
 115  * count as it is legitimate for a task to yield from within a critical\r
 116  * section.  If the banked memory model is being used then the PPAGE\r
 117  * register is also stored as part of the tasks context.\r
 118  */\r
 119 \r
 120 #ifdef BANKED_MODEL\r
 121         /* \r
 122          * Load the stack pointer for the task, then pull the critical nesting\r
 123          * count and PPAGE register from the stack.  The remains of the \r
 124          * context are restored by the RTI instruction.\r
 125          */\r
 126         #define portRESTORE_CONTEXT()                                                                   \\r
 127         {                                                                                                                               \\r
 128                 extern volatile void * pxCurrentTCB;                                            \\r
 129                 extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
 130                                                                                                                                         \\r
 131                 __asm( "ldx pxCurrentTCB" );                                                            \\r
 132                 __asm( "lds 0, x" );                                                                            \\r
 133                 __asm( "pula" );                                                                                        \\r
 134                 __asm( "staa uxCriticalNesting" );                                                      \\r
 135                 __asm( "pula" );                                                                                        \\r
 136                 __asm( "staa 0x30" ); /* 0x30 = PPAGE */                                        \\r
 137         }\r
 138 \r
 139         /* \r
 140          * By the time this macro is called the processor has already stacked the\r
 141          * registers.  Simply stack the nesting count and PPAGE value, then save \r
 142          * the task stack pointer.\r
 143          */\r
 144         #define portSAVE_CONTEXT()                                                                              \\r
 145         {                                                                                                                               \\r
 146                 extern volatile void * pxCurrentTCB;                                            \\r
 147                 extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
 148                                                                                                                                         \\r
 149                 __asm( "ldaa 0x30" );  /* 0x30 = PPAGE */                                       \\r
 150                 __asm( "psha" );                                                                                        \\r
 151                 __asm( "ldaa uxCriticalNesting" );                                                      \\r
 152                 __asm( "psha" );                                                                                        \\r
 153                 __asm( "ldx pxCurrentTCB" );                                                            \\r
 154                 __asm( "sts 0, x" );                                                                            \\r
 155         }\r
 156 #else\r
 157 \r
 158         /* \r
 159          * These macros are as per the BANKED versions above, but without saving\r
 160          * and restoring the PPAGE register.\r
 161          */\r
 162 \r
 163         #define portRESTORE_CONTEXT()                                                                   \\r
 164         {                                                                                                                               \\r
 165                 extern volatile void * pxCurrentTCB;                                            \\r
 166                 extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
 167                                                                                                                                         \\r
 168                 __asm( "ldx pxCurrentTCB" );                                                            \\r
 169                 __asm( "lds 0, x" );                                                                            \\r
 170                 __asm( "pula" );                                                                                        \\r
 171                 __asm( "staa uxCriticalNesting" );                                                      \\r
 172         }\r
 173 \r
 174         #define portSAVE_CONTEXT()                                                                              \\r
 175         {                                                                                                                               \\r
 176                 extern volatile void * pxCurrentTCB;                                            \\r
 177                 extern volatile unsigned portBASE_TYPE uxCriticalNesting;       \\r
 178                                                                                                                                         \\r
 179                 __asm( "ldaa uxCriticalNesting" );                                                      \\r
 180                 __asm( "psha" );                                                                                        \\r
 181                 __asm( "ldx pxCurrentTCB" );                                                            \\r
 182                 __asm( "sts 0, x" );                                                                            \\r
 183         }\r
 184 #endif\r
 185 \r
 186 /*\r
 187  * Utility macro to call macros above in correct order in order to perform a\r
 188  * task switch from within a standard ISR.  This macro can only be used if\r
 189  * the ISR does not use any local (stack) variables.  If the ISR uses stack\r
 190  * variables portYIELD() should be used in it's place.\r
 191  */\r
 192 #define portTASK_SWITCH_FROM_ISR()                                                              \\r
 193         portSAVE_CONTEXT();                                                                                     \\r
 194         vTaskSwitchContext();                                                                           \\r
 195         portRESTORE_CONTEXT();\r
 196 \r
 197 \r
 198 /* Task function macros as described on the FreeRTOS.org WEB site. */\r
 199 #define portTASK_FUNCTION_PROTO( vFunction, pvParameters ) void vFunction( void *pvParameters )\r
 200 #define portTASK_FUNCTION( vFunction, pvParameters ) void vFunction( void *pvParameters )\r
 201 \r
 202 #define inline\r
 203 \r
 204 #endif /* PORTMACRO_H */\r
 205 \r