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

   1 /*\r
   2     FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.\r
   3         \r
   4 \r
   5     ***************************************************************************\r
   6      *                                                                       *\r
   7      *    FreeRTOS tutorial books are available in pdf and paperback.        *\r
   8      *    Complete, revised, and edited pdf reference manuals are also       *\r
   9      *    available.                                                         *\r
  10      *                                                                       *\r
  11      *    Purchasing FreeRTOS documentation will not only help you, by       *\r
  12      *    ensuring you get running as quickly as possible and with an        *\r
  13      *    in-depth knowledge of how to use FreeRTOS, it will also help       *\r
  14      *    the FreeRTOS project to continue with its mission of providing     *\r
  15      *    professional grade, cross platform, de facto standard solutions    *\r
  16      *    for microcontrollers - completely free of charge!                  *\r
  17      *                                                                       *\r
  18      *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *\r
  19      *                                                                       *\r
  20      *    Thank you for using FreeRTOS, and thank you for your support!      *\r
  21      *                                                                       *\r
  22     ***************************************************************************\r
  23 \r
  24 \r
  25     This file is part of the FreeRTOS distribution.\r
  26 \r
  27     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  28     the terms of the GNU General Public License (version 2) as published by the\r
  29     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
  30     >>>NOTE<<< The modification to the GPL is included to allow you to\r
  31     distribute a combined work that includes FreeRTOS without being obliged to\r
  32     provide the source code for proprietary components outside of the FreeRTOS\r
  33     kernel.  FreeRTOS is distributed in the hope that it will be useful, but\r
  34     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
  35     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
  36     more details. You should have received a copy of the GNU General Public\r
  37     License and the FreeRTOS license exception along with FreeRTOS; if not it\r
  38     can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
  39     by writing to Richard Barry, contact details for whom are available on the\r
  40     FreeRTOS WEB site.\r
  41 \r
  42     1 tab == 4 spaces!\r
  43     \r
  44     ***************************************************************************\r
  45      *                                                                       *\r
  46      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  47      *    not run, what could be wrong?                                      *\r
  48      *                                                                       *\r
  49      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  50      *                                                                       *\r
  51     ***************************************************************************\r
  52 \r
  53     \r
  54     http://www.FreeRTOS.org - Documentation, training, latest information, \r
  55     license and contact details.\r
  56     \r
  57     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  58     including FreeRTOS+Trace - an indispensable productivity tool.\r
  59 \r
  60     Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell \r
  61     the code with commercial support, indemnification, and middleware, under \r
  62     the OpenRTOS brand: http://www.OpenRTOS.com.  High Integrity Systems also\r
  63     provide a safety engineered and independently SIL3 certified version under \r
  64     the SafeRTOS brand: http://www.SafeRTOS.com.\r
  65 */\r
  66 \r
  67         .global _vPortYield\r
  68                 .extern _vTaskSwitchContext\r
  69                 .extern uxCriticalNesting\r
  70 \r
  71 _vPortYield:\r
  72 \r
  73                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  74                 PUSH    W0                                              /* ....then disable interrupts. */\r
  75                 MOV             #32, W0\r
  76                 MOV             W0, SR\r
  77                 PUSH    W1                                              /* Save registers to the stack. */\r
  78                 PUSH.D  W2\r
  79                 PUSH.D  W4\r
  80                 PUSH.D  W6\r
  81                 PUSH.D  W8\r
  82                 PUSH.D  W10\r
  83                 PUSH.D  W12\r
  84                 PUSH    W14\r
  85                 PUSH    RCOUNT\r
  86                 PUSH    TBLPAG\r
  87                 PUSH    ACCAL\r
  88                 PUSH    ACCAH\r
  89                 PUSH    ACCAU\r
  90                 PUSH    ACCBL\r
  91                 PUSH    ACCBH\r
  92                 PUSH    ACCBU\r
  93                 PUSH    DCOUNT\r
  94                 PUSH    DOSTARTL\r
  95                 PUSH    DOSTARTH\r
  96                 PUSH    DOENDL\r
  97                 PUSH    DOENDH\r
  98                 \r
  99                                                                                                                                                                                 \r
 100                 PUSH    CORCON\r
 101                 PUSH    PSVPAG\r
 102                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 103                 PUSH    W0\r
 104                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 105                 MOV             W15, [W0]\r
 106 \r
 107                 call    _vTaskSwitchContext\r
 108 \r
 109                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 110                 MOV             [W0], W15\r
 111                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 112                 MOV             W0, _uxCriticalNesting\r
 113                 POP             PSVPAG\r
 114                 POP             CORCON\r
 115                 POP             DOENDH\r
 116                 POP             DOENDL\r
 117                 POP             DOSTARTH\r
 118                 POP             DOSTARTL\r
 119                 POP             DCOUNT\r
 120                 POP             ACCBU\r
 121                 POP             ACCBH\r
 122                 POP             ACCBL\r
 123                 POP             ACCAU\r
 124                 POP             ACCAH\r
 125                 POP             ACCAL\r
 126                 POP             TBLPAG\r
 127                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 128                 POP             W14\r
 129                 POP.D   W12\r
 130                 POP.D   W10\r
 131                 POP.D   W8\r
 132                 POP.D   W6\r
 133                 POP.D   W4\r
 134                 POP.D   W2\r
 135                 POP.D   W0\r
 136                 POP             SR\r
 137 \r
 138         return\r
 139 \r
 140         .end\r