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

   1 /*\r
   2     FreeRTOS V8.0.0 - 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 distribute\r
  28     >>! a combined work that includes FreeRTOS without being obliged to provide\r
  29     >>! the source code for proprietary components outside of the FreeRTOS\r
  30     >>! 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( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ )\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 \r
  89                 PUSH    CORCON\r
  90                 #ifdef __HAS_EDS__\r
  91                         PUSH    DSRPAG\r
  92                         PUSH    DSWPAG\r
  93                 #else\r
  94                         PUSH    PSVPAG\r
  95                 #endif /* __HAS_EDS__ */\r
  96                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
  97                 PUSH    W0\r
  98                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
  99                 MOV             W15, [W0]\r
 100 \r
 101                 call    _vTaskSwitchContext\r
 102 \r
 103                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 104                 MOV             [W0], W15\r
 105                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 106                 MOV             W0, _uxCriticalNesting\r
 107                 #ifdef __HAS_EDS__\r
 108                         POP             DSWPAG\r
 109                         POP             DSRPAG\r
 110                 #else\r
 111                         POP             PSVPAG\r
 112                 #endif /* __HAS_EDS__ */\r
 113                 POP             CORCON\r
 114                 POP             TBLPAG\r
 115                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 116                 POP             W14\r
 117                 POP.D   W12\r
 118                 POP.D   W10\r
 119                 POP.D   W8\r
 120                 POP.D   W6\r
 121                 POP.D   W4\r
 122                 POP.D   W2\r
 123                 POP.D   W0\r
 124                 POP             SR\r
 125 \r
 126         return\r
 127 \r
 128         .end\r
 129                 \r
 130 #endif /* defined( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ ) */