git.sur5r.net Git - freertos/blob - FreeRTOS/Source/portable/MPLAB/PIC24_dsPIC/portasm_dsPIC.S

   1 /*\r
   2     FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.\r
   3 \r
   4     FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT\r
   5     http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
   9      *    FreeRTOS tutorial books are available in pdf and paperback.        *\r
  10      *    Complete, revised, and edited pdf reference manuals are also       *\r
  11      *    available.                                                         *\r
  12      *                                                                       *\r
  13      *    Purchasing FreeRTOS documentation will not only help you, by       *\r
  14      *    ensuring you get running as quickly as possible and with an        *\r
  15      *    in-depth knowledge of how to use FreeRTOS, it will also help       *\r
  16      *    the FreeRTOS project to continue with its mission of providing     *\r
  17      *    professional grade, cross platform, de facto standard solutions    *\r
  18      *    for microcontrollers - completely free of charge!                  *\r
  19      *                                                                       *\r
  20      *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *\r
  21      *                                                                       *\r
  22      *    Thank you for using FreeRTOS, and thank you for your support!      *\r
  23      *                                                                       *\r
  24     ***************************************************************************\r
  25 \r
  26 \r
  27     This file is part of the FreeRTOS distribution.\r
  28 \r
  29     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  30     the terms of the GNU General Public License (version 2) as published by the\r
  31     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
  32 \r
  33     >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to\r
  34     distribute a combined work that includes FreeRTOS without being obliged to\r
  35     provide the source code for proprietary components outside of the FreeRTOS\r
  36     kernel.\r
  37 \r
  38     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  39     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  40     FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\r
  41     details. You should have received a copy of the GNU General Public License\r
  42     and the FreeRTOS license exception along with FreeRTOS; if not it can be\r
  43     viewed here: http://www.freertos.org/a00114.html and also obtained by\r
  44     writing to Real Time Engineers Ltd., contact details for whom are available\r
  45     on the FreeRTOS WEB site.\r
  46 \r
  47     1 tab == 4 spaces!\r
  48 \r
  49     ***************************************************************************\r
  50      *                                                                       *\r
  51      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  52      *    not run, what could be wrong?"                                     *\r
  53      *                                                                       *\r
  54      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  55      *                                                                       *\r
  56     ***************************************************************************\r
  57 \r
  58 \r
  59     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  60     license and Real Time Engineers Ltd. contact details.\r
  61 \r
  62     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  63     including FreeRTOS+Trace - an indispensable productivity tool, and our new\r
  64     fully thread aware and reentrant UDP/IP stack.\r
  65 \r
  66     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  67     Integrity Systems, who sell the code with commercial support,\r
  68     indemnification and middleware, under the OpenRTOS brand.\r
  69 \r
  70     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  71     engineered and independently SIL3 certified version for use in safety and\r
  72     mission critical applications that require provable dependability.\r
  73 */\r
  74 \r
  75 #if defined( __dsPIC30F__ ) || defined( __dsPIC33F__ )\r
  76 \r
  77         .global _vPortYield\r
  78                 .extern _vTaskSwitchContext\r
  79                 .extern uxCriticalNesting\r
  80 \r
  81 _vPortYield:\r
  82 \r
  83                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  84                 PUSH    W0                                              /* ....then disable interrupts. */\r
  85                 MOV             #32, W0\r
  86                 MOV             W0, SR\r
  87                 PUSH    W1                                              /* Save registers to the stack. */\r
  88                 PUSH.D  W2\r
  89                 PUSH.D  W4\r
  90                 PUSH.D  W6\r
  91                 PUSH.D  W8\r
  92                 PUSH.D  W10\r
  93                 PUSH.D  W12\r
  94                 PUSH    W14\r
  95                 PUSH    RCOUNT\r
  96                 PUSH    TBLPAG\r
  97                 PUSH    ACCAL\r
  98                 PUSH    ACCAH\r
  99                 PUSH    ACCAU\r
 100                 PUSH    ACCBL\r
 101                 PUSH    ACCBH\r
 102                 PUSH    ACCBU\r
 103                 PUSH    DCOUNT\r
 104                 PUSH    DOSTARTL\r
 105                 PUSH    DOSTARTH\r
 106                 PUSH    DOENDL\r
 107                 PUSH    DOENDH\r
 108 \r
 109 \r
 110                 PUSH    CORCON\r
 111                 PUSH    PSVPAG\r
 112                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 113                 PUSH    W0\r
 114                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 115                 MOV             W15, [W0]\r
 116 \r
 117                 call    _vTaskSwitchContext\r
 118 \r
 119                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 120                 MOV             [W0], W15\r
 121                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 122                 MOV             W0, _uxCriticalNesting\r
 123                 POP             PSVPAG\r
 124                 POP             CORCON\r
 125                 POP             DOENDH\r
 126                 POP             DOENDL\r
 127                 POP             DOSTARTH\r
 128                 POP             DOSTARTL\r
 129                 POP             DCOUNT\r
 130                 POP             ACCBU\r
 131                 POP             ACCBH\r
 132                 POP             ACCBL\r
 133                 POP             ACCAU\r
 134                 POP             ACCAH\r
 135                 POP             ACCAL\r
 136                 POP             TBLPAG\r
 137                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 138                 POP             W14\r
 139                 POP.D   W12\r
 140                 POP.D   W10\r
 141                 POP.D   W8\r
 142                 POP.D   W6\r
 143                 POP.D   W4\r
 144                 POP.D   W2\r
 145                 POP.D   W0\r
 146                 POP             SR\r
 147 \r
 148         return\r
 149 \r
 150         .end\r
 151 \r
 152 #endif /* defined( __dsPIC30F__ ) || defined( __dsPIC33F__ ) */\r
 153 \r