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

   1 /*\r
   2     FreeRTOS V7.4.0 - 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 itcan 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         .global _vPortYield\r
  76                 .extern _vTaskSwitchContext\r
  77                 .extern uxCriticalNesting\r
  78 \r
  79 _vPortYield:\r
  80 \r
  81                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  82                 PUSH    W0                                              /* ....then disable interrupts. */\r
  83                 MOV             #32, W0\r
  84                 MOV             W0, SR\r
  85                 PUSH    W1                                              /* Save registers to the stack. */\r
  86                 PUSH.D  W2\r
  87                 PUSH.D  W4\r
  88                 PUSH.D  W6\r
  89                 PUSH.D  W8\r
  90                 PUSH.D  W10\r
  91                 PUSH.D  W12\r
  92                 PUSH    W14\r
  93                 PUSH    RCOUNT\r
  94                 PUSH    TBLPAG\r
  95                 PUSH    ACCAL\r
  96                 PUSH    ACCAH\r
  97                 PUSH    ACCAU\r
  98                 PUSH    ACCBL\r
  99                 PUSH    ACCBH\r
 100                 PUSH    ACCBU\r
 101                 PUSH    DCOUNT\r
 102                 PUSH    DOSTARTL\r
 103                 PUSH    DOSTARTH\r
 104                 PUSH    DOENDL\r
 105                 PUSH    DOENDH\r
 106                 \r
 107                                                                                                                                                                                 \r
 108                 PUSH    CORCON\r
 109                 PUSH    PSVPAG\r
 110                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 111                 PUSH    W0\r
 112                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 113                 MOV             W15, [W0]\r
 114 \r
 115                 call    _vTaskSwitchContext\r
 116 \r
 117                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 118                 MOV             [W0], W15\r
 119                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 120                 MOV             W0, _uxCriticalNesting\r
 121                 POP             PSVPAG\r
 122                 POP             CORCON\r
 123                 POP             DOENDH\r
 124                 POP             DOENDL\r
 125                 POP             DOSTARTH\r
 126                 POP             DOSTARTL\r
 127                 POP             DCOUNT\r
 128                 POP             ACCBU\r
 129                 POP             ACCBH\r
 130                 POP             ACCBL\r
 131                 POP             ACCAU\r
 132                 POP             ACCAH\r
 133                 POP             ACCAL\r
 134                 POP             TBLPAG\r
 135                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 136                 POP             W14\r
 137                 POP.D   W12\r
 138                 POP.D   W10\r
 139                 POP.D   W8\r
 140                 POP.D   W6\r
 141                 POP.D   W4\r
 142                 POP.D   W2\r
 143                 POP.D   W0\r
 144                 POP             SR\r
 145 \r
 146         return\r
 147 \r
 148         .end\r