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

   1 /*\r
   2     FreeRTOS V7.3.0 - Copyright (C) 2012 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     >>>NOTE<<< The modification to the GPL is included to allow you to\r
  33     distribute a combined work that includes FreeRTOS without being obliged to\r
  34     provide the source code for proprietary components outside of the FreeRTOS\r
  35     kernel.  FreeRTOS is distributed in the hope that it will be useful, but\r
  36     WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\r
  37     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
  38     more details. You should have received a copy of the GNU General Public\r
  39     License and the FreeRTOS license exception along with FreeRTOS; if not it\r
  40     can be viewed here: http://www.freertos.org/a00114.html and also obtained\r
  41     by writing to Richard Barry, contact details for whom are available on the\r
  42     FreeRTOS WEB site.\r
  43 \r
  44     1 tab == 4 spaces!\r
  45 \r
  46     ***************************************************************************\r
  47      *                                                                       *\r
  48      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  49      *    not run, what could be wrong?"                                     *\r
  50      *                                                                       *\r
  51      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  52      *                                                                       *\r
  53     ***************************************************************************\r
  54 \r
  55 \r
  56     http://www.FreeRTOS.org - Documentation, training, latest versions, license\r
  57     and contact details.\r
  58 \r
  59     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  60     including FreeRTOS+Trace - an indispensable productivity tool.\r
  61 \r
  62     Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell\r
  63     the code with commercial support, indemnification, and middleware, under\r
  64     the OpenRTOS brand: http://www.OpenRTOS.com.  High Integrity Systems also\r
  65     provide a safety engineered and independently SIL3 certified version under\r
  66     the SafeRTOS brand: http://www.SafeRTOS.com.\r
  67 */\r
  68 \r
  69         .global _vPortYield\r
  70                 .extern _vTaskSwitchContext\r
  71                 .extern uxCriticalNesting\r
  72 \r
  73 _vPortYield:\r
  74 \r
  75                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  76                 PUSH    W0                                              /* ....then disable interrupts. */\r
  77                 MOV             #32, W0\r
  78                 MOV             W0, SR\r
  79                 PUSH    W1                                              /* Save registers to the stack. */\r
  80                 PUSH.D  W2\r
  81                 PUSH.D  W4\r
  82                 PUSH.D  W6\r
  83                 PUSH.D  W8\r
  84                 PUSH.D  W10\r
  85                 PUSH.D  W12\r
  86                 PUSH    W14\r
  87                 PUSH    RCOUNT\r
  88                 PUSH    TBLPAG\r
  89 \r
  90                 PUSH    CORCON\r
  91                 #ifdef __HAS_EDS__\r
  92                         PUSH    DSRPAG\r
  93                         PUSH    DSWPAG\r
  94                 #else\r
  95                         PUSH    PSVPAG\r
  96                 #endif /* __HAS_EDS__ */\r
  97                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
  98                 PUSH    W0\r
  99                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 100                 MOV             W15, [W0]\r
 101 \r
 102                 call    _vTaskSwitchContext\r
 103 \r
 104                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 105                 MOV             [W0], W15\r
 106                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 107                 MOV             W0, _uxCriticalNesting\r
 108 #ifdef __HAS_EDS__\r
 109         POP     DSWPAG\r
 110         POP     DSRPAG\r
 111 #else\r
 112                 POP             PSVPAG\r
 113 #endif /* __HAS_EDS__ */\r
 114                 POP             CORCON\r
 115                 POP             TBLPAG\r
 116                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 117                 POP             W14\r
 118                 POP.D   W12\r
 119                 POP.D   W10\r
 120                 POP.D   W8\r
 121                 POP.D   W6\r
 122                 POP.D   W4\r
 123                 POP.D   W2\r
 124                 POP.D   W0\r
 125                 POP             SR\r
 126 \r
 127         return\r
 128 \r
 129         .end\r