git.sur5r.net Git - freertos/blob - Source/portable/Paradigm/Tern_EE/small/portasm.h

   1 /*\r
   2         FreeRTOS.org V4.6.1 - Copyright (C) 2003-2007 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
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  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         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         Also see http://www.SafeRTOS.com a version that has been certified for use\r
  32         in safety critical systems, plus commercial licensing, development and\r
  33         support options.\r
  34         ***************************************************************************\r
  35 */\r
  36 \r
  37 #ifndef PORT_ASM_H\r
  38 #define PORT_ASM_H\r
  39 \r
  40 typedef void tskTCB;\r
  41 extern volatile tskTCB * volatile pxCurrentTCB;\r
  42 extern void vTaskSwitchContext( void );\r
  43 \r
  44 /*\r
  45  * Saves the stack pointer for one task into its TCB, calls\r
  46  * vTaskSwitchContext() to update the TCB being used, then restores the stack\r
  47  * from the new TCB read to run the task.\r
  48  */\r
  49 void portEND_SWITCHING_ISR( void );\r
  50 \r
  51 /*\r
  52  * Load the stack pointer from the TCB of the task which is going to be first\r
  53  * to execute.  Then force an IRET so the registers and IP are popped off the\r
  54  * stack.\r
  55  */\r
  56 void portFIRST_CONTEXT( void );\r
  57 \r
  58 #define portEND_SWITCHING_ISR()                                                                                 \\r
  59                                                         asm { mov       bx, [pxCurrentTCB]                      }   \\r
  60                             asm { mov   word ptr [bx], sp                       }       \\r
  61                                                         asm { call  far ptr vTaskSwitchContext  }       \\r
  62                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
  63                                                         asm { mov       sp, [bx]                                        }\r
  64 \r
  65 #define portFIRST_CONTEXT()                                                                                     \\r
  66                                                         asm { mov       bx, [pxCurrentTCB]                      }       \\r
  67                                                         asm { mov       sp, [bx]                                        }       \\r
  68                                                         asm { pop       bp                                                      }       \\r
  69                                                         asm { pop       di                                                      }       \\r
  70                                                         asm { pop       si                                                      }       \\r
  71                                                         asm { pop       ds                                                      }       \\r
  72                                                         asm { pop       es                                                      }       \\r
  73                                                         asm { pop       dx                                                      }       \\r
  74                                                         asm { pop       cx                                                      }       \\r
  75                                                         asm { pop       bx                                                      }       \\r
  76                                                         asm { pop       ax                                                      }       \\r
  77                                                         asm { iret                                                              }\r
  78 \r
  79 \r
  80 #endif\r
  81 \r