git.sur5r.net Git - freertos/blob - FreeRTOS/Source/portable/MPLAB/PIC24_dsPIC/portasm_PIC24.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 \r
  96                 PUSH    CORCON\r
  97                 #ifdef __HAS_EDS__\r
  98                         PUSH    DSRPAG\r
  99                         PUSH    DSWPAG\r
 100                 #else\r
 101                         PUSH    PSVPAG\r
 102                 #endif /* __HAS_EDS__ */\r
 103                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 104                 PUSH    W0\r
 105                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 106                 MOV             W15, [W0]\r
 107 \r
 108                 call    _vTaskSwitchContext\r
 109 \r
 110                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 111                 MOV             [W0], W15\r
 112                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 113                 MOV             W0, _uxCriticalNesting\r
 114                 #ifdef __HAS_EDS__\r
 115                         POP             DSWPAG\r
 116                         POP             DSRPAG\r
 117                 #else\r
 118                         POP             PSVPAG\r
 119                 #endif /* __HAS_EDS__ */\r
 120                 POP             CORCON\r
 121                 POP             TBLPAG\r
 122                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 123                 POP             W14\r
 124                 POP.D   W12\r
 125                 POP.D   W10\r
 126                 POP.D   W8\r
 127                 POP.D   W6\r
 128                 POP.D   W4\r
 129                 POP.D   W2\r
 130                 POP.D   W0\r
 131                 POP             SR\r
 132 \r
 133         return\r
 134 \r
 135         .end\r