git.sur5r.net Git - freertos/blob - Source/portable/MPLAB/PIC24_dsPIC/portasm_PIC24.S

   1 /*\r
   2     FreeRTOS V7.1.1 - 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                                                                                                                                                                                 \r
  88                 PUSH    CORCON\r
  89                 PUSH    PSVPAG\r
  90                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
  91                 PUSH    W0\r
  92                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
  93                 MOV             W15, [W0]\r
  94 \r
  95                 call    _vTaskSwitchContext\r
  96 \r
  97                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
  98                 MOV             [W0], W15\r
  99                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 100                 MOV             W0, _uxCriticalNesting\r
 101                 POP             PSVPAG\r
 102                 POP             CORCON\r
 103                 POP             TBLPAG\r
 104                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 105                 POP             W14\r
 106                 POP.D   W12\r
 107                 POP.D   W10\r
 108                 POP.D   W8\r
 109                 POP.D   W6\r
 110                 POP.D   W4\r
 111                 POP.D   W2\r
 112                 POP.D   W0\r
 113                 POP             SR\r
 114 \r
 115         return\r
 116 \r
 117         .end\r