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

   1 /*\r
   2     FreeRTOS V8.1.2 - Copyright (C) 2014 Real Time Engineers Ltd. \r
   3     All rights reserved\r
   4 \r
   5     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
   9      *    FreeRTOS provides completely free yet professionally developed,    *\r
  10      *    robust, strictly quality controlled, supported, and cross          *\r
  11      *    platform software that has become a de facto standard.             *\r
  12      *                                                                       *\r
  13      *    Help yourself get started quickly and support the FreeRTOS         *\r
  14      *    project by purchasing a FreeRTOS tutorial book, reference          *\r
  15      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *\r
  16      *                                                                       *\r
  17      *    Thank you!                                                         *\r
  18      *                                                                       *\r
  19     ***************************************************************************\r
  20 \r
  21     This file is part of the FreeRTOS distribution.\r
  22 \r
  23     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  24     the terms of the GNU General Public License (version 2) as published by the\r
  25     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  26 \r
  27     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  28     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  29     >>!   obliged to provide the source code for proprietary components     !<<\r
  30     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  31 \r
  32     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  33     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  34     FOR A PARTICULAR PURPOSE.  Full license text is available from the following\r
  35     link: http://www.freertos.org/a00114.html\r
  36 \r
  37     1 tab == 4 spaces!\r
  38 \r
  39     ***************************************************************************\r
  40      *                                                                       *\r
  41      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  42      *    not run, what could be wrong?"                                     *\r
  43      *                                                                       *\r
  44      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  49     license and Real Time Engineers Ltd. contact details.\r
  50 \r
  51     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  52     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  53     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  54 \r
  55     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  56     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  57     licenses offer ticketed support, indemnification and middleware.\r
  58 \r
  59     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  60     engineered and independently SIL3 certified version for use in safety and\r
  61     mission critical applications that require provable dependability.\r
  62 \r
  63     1 tab == 4 spaces!\r
  64 */\r
  65 \r
  66 #if defined( __dsPIC30F__ ) || defined( __dsPIC33F__ )\r
  67 \r
  68         .global _vPortYield\r
  69                 .extern _vTaskSwitchContext\r
  70                 .extern uxCriticalNesting\r
  71 \r
  72 _vPortYield:\r
  73 \r
  74                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  75                 PUSH    W0                                              /* ....then disable interrupts. */\r
  76                 MOV             #32, W0\r
  77                 MOV             W0, SR\r
  78                 PUSH    W1                                              /* Save registers to the stack. */\r
  79                 PUSH.D  W2\r
  80                 PUSH.D  W4\r
  81                 PUSH.D  W6\r
  82                 PUSH.D  W8\r
  83                 PUSH.D  W10\r
  84                 PUSH.D  W12\r
  85                 PUSH    W14\r
  86                 PUSH    RCOUNT\r
  87                 PUSH    TBLPAG\r
  88                 PUSH    ACCAL\r
  89                 PUSH    ACCAH\r
  90                 PUSH    ACCAU\r
  91                 PUSH    ACCBL\r
  92                 PUSH    ACCBH\r
  93                 PUSH    ACCBU\r
  94                 PUSH    DCOUNT\r
  95                 PUSH    DOSTARTL\r
  96                 PUSH    DOSTARTH\r
  97                 PUSH    DOENDL\r
  98                 PUSH    DOENDH\r
  99 \r
 100 \r
 101                 PUSH    CORCON\r
 102                 PUSH    PSVPAG\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                 POP             PSVPAG\r
 115                 POP             CORCON\r
 116                 POP             DOENDH\r
 117                 POP             DOENDL\r
 118                 POP             DOSTARTH\r
 119                 POP             DOSTARTL\r
 120                 POP             DCOUNT\r
 121                 POP             ACCBU\r
 122                 POP             ACCBH\r
 123                 POP             ACCBL\r
 124                 POP             ACCAU\r
 125                 POP             ACCAH\r
 126                 POP             ACCAL\r
 127                 POP             TBLPAG\r
 128                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 129                 POP             W14\r
 130                 POP.D   W12\r
 131                 POP.D   W10\r
 132                 POP.D   W8\r
 133                 POP.D   W6\r
 134                 POP.D   W4\r
 135                 POP.D   W2\r
 136                 POP.D   W0\r
 137                 POP             SR\r
 138 \r
 139         return\r
 140 \r
 141         .end\r
 142 \r
 143 #endif /* defined( __dsPIC30F__ ) || defined( __dsPIC33F__ ) */\r
 144 \r