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

   1 /*\r
   2     FreeRTOS V8.2.0rc1 - 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     This file is part of the FreeRTOS distribution.\r
   8 \r
   9     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  10     the terms of the GNU General Public License (version 2) as published by the\r
  11     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  12 \r
  13     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  14     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  15     >>!   obliged to provide the source code for proprietary components     !<<\r
  16     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  17 \r
  18     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  19     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  20     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
  21     link: http://www.freertos.org/a00114.html\r
  22 \r
  23     1 tab == 4 spaces!\r
  24 \r
  25     ***************************************************************************\r
  26      *                                                                       *\r
  27      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  28      *    not run, what could be wrong?".  Have you defined configASSERT()?  *\r
  29      *                                                                       *\r
  30      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  31      *                                                                       *\r
  32     ***************************************************************************\r
  33 \r
  34     ***************************************************************************\r
  35      *                                                                       *\r
  36      *    FreeRTOS provides completely free yet professionally developed,    *\r
  37      *    robust, strictly quality controlled, supported, and cross          *\r
  38      *    platform software that is more than just the market leader, it     *\r
  39      *    is the industry's de facto standard.                               *\r
  40      *                                                                       *\r
  41      *    Help yourself get started quickly while simultaneously helping     *\r
  42      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
  43      *    tutorial book, reference manual, or both:                          *\r
  44      *    http://www.FreeRTOS.org/Documentation                              *\r
  45      *                                                                       *\r
  46     ***************************************************************************\r
  47 \r
  48     ***************************************************************************\r
  49      *                                                                       *\r
  50      *   Investing in training allows your team to be as productive as       *\r
  51      *   possible as early as possible, lowering your overall development    *\r
  52      *   cost, and enabling you to bring a more robust product to market     *\r
  53      *   earlier than would otherwise be possible.  Richard Barry is both    *\r
  54      *   the architect and key author of FreeRTOS, and so also the world's   *\r
  55      *   leading authority on what is the world's most popular real time     *\r
  56      *   kernel for deeply embedded MCU designs.  Obtaining your training    *\r
  57      *   from Richard ensures your team will gain directly from his in-depth *\r
  58      *   product knowledge and years of usage experience.  Contact Real Time *\r
  59      *   Engineers Ltd to enquire about the FreeRTOS Masterclass, presented  *\r
  60      *   by Richard Barry:  http://www.FreeRTOS.org/contact\r
  61      *                                                                       *\r
  62     ***************************************************************************\r
  63 \r
  64     ***************************************************************************\r
  65      *                                                                       *\r
  66      *    You are receiving this top quality software for free.  Please play *\r
  67      *    fair and reciprocate by reporting any suspected issues and         *\r
  68      *    participating in the community forum:                              *\r
  69      *    http://www.FreeRTOS.org/support                                    *\r
  70      *                                                                       *\r
  71      *    Thank you!                                                         *\r
  72      *                                                                       *\r
  73     ***************************************************************************\r
  74 \r
  75     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  76     license and Real Time Engineers Ltd. contact details.\r
  77 \r
  78     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  79     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  80     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  81 \r
  82     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
  83     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
  84 \r
  85     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  86     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  87     licenses offer ticketed support, indemnification and commercial middleware.\r
  88 \r
  89     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  90     engineered and independently SIL3 certified version for use in safety and\r
  91     mission critical applications that require provable dependability.\r
  92 \r
  93     1 tab == 4 spaces!\r
  94 */\r
  95 \r
  96 #if defined( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ )\r
  97 \r
  98         .global _vPortYield\r
  99                 .extern _vTaskSwitchContext\r
 100                 .extern uxCriticalNesting\r
 101 \r
 102 _vPortYield:\r
 103 \r
 104                 PUSH    SR                                              /* Save the SR used by the task.... */\r
 105                 PUSH    W0                                              /* ....then disable interrupts. */\r
 106                 MOV             #32, W0\r
 107                 MOV             W0, SR\r
 108                 PUSH    W1                                              /* Save registers to the stack. */\r
 109                 PUSH.D  W2\r
 110                 PUSH.D  W4\r
 111                 PUSH.D  W6\r
 112                 PUSH.D  W8\r
 113                 PUSH.D  W10\r
 114                 PUSH.D  W12\r
 115                 PUSH    W14\r
 116                 PUSH    RCOUNT\r
 117                 PUSH    TBLPAG\r
 118 \r
 119                 PUSH    CORCON\r
 120                 #ifdef __HAS_EDS__\r
 121                         PUSH    DSRPAG\r
 122                         PUSH    DSWPAG\r
 123                 #else\r
 124                         PUSH    PSVPAG\r
 125                 #endif /* __HAS_EDS__ */\r
 126                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 127                 PUSH    W0\r
 128                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 129                 MOV             W15, [W0]\r
 130 \r
 131                 call    _vTaskSwitchContext\r
 132 \r
 133                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 134                 MOV             [W0], W15\r
 135                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 136                 MOV             W0, _uxCriticalNesting\r
 137                 #ifdef __HAS_EDS__\r
 138                         POP             DSWPAG\r
 139                         POP             DSRPAG\r
 140                 #else\r
 141                         POP             PSVPAG\r
 142                 #endif /* __HAS_EDS__ */\r
 143                 POP             CORCON\r
 144                 POP             TBLPAG\r
 145                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 146                 POP             W14\r
 147                 POP.D   W12\r
 148                 POP.D   W10\r
 149                 POP.D   W8\r
 150                 POP.D   W6\r
 151                 POP.D   W4\r
 152                 POP.D   W2\r
 153                 POP.D   W0\r
 154                 POP             SR\r
 155 \r
 156         return\r
 157 \r
 158         .end\r
 159                 \r
 160 #endif /* defined( __PIC24E__ ) || defined ( __PIC24F__ ) || defined( __PIC24FK__ ) || defined( __PIC24H__ ) */