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

   1 /*\r
   2     FreeRTOS V9.0.0rc2 - Copyright (C) 2016 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     ***************************************************************************\r
  14     >>!   NOTE: The modification to the GPL is included to allow you to     !<<\r
  15     >>!   distribute a combined work that includes FreeRTOS without being   !<<\r
  16     >>!   obliged to provide the source code for proprietary components     !<<\r
  17     >>!   outside of the FreeRTOS kernel.                                   !<<\r
  18     ***************************************************************************\r
  19 \r
  20     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  21     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  22     FOR A PARTICULAR PURPOSE.  Full license text is available on the following\r
  23     link: http://www.freertos.org/a00114.html\r
  24 \r
  25     ***************************************************************************\r
  26      *                                                                       *\r
  27      *    FreeRTOS provides completely free yet professionally developed,    *\r
  28      *    robust, strictly quality controlled, supported, and cross          *\r
  29      *    platform software that is more than just the market leader, it     *\r
  30      *    is the industry's de facto standard.                               *\r
  31      *                                                                       *\r
  32      *    Help yourself get started quickly while simultaneously helping     *\r
  33      *    to support the FreeRTOS project by purchasing a FreeRTOS           *\r
  34      *    tutorial book, reference manual, or both:                          *\r
  35      *    http://www.FreeRTOS.org/Documentation                              *\r
  36      *                                                                       *\r
  37     ***************************************************************************\r
  38 \r
  39     http://www.FreeRTOS.org/FAQHelp.html - Having a problem?  Start by reading\r
  40     the FAQ page "My application does not run, what could be wrong?".  Have you\r
  41     defined configASSERT()?\r
  42 \r
  43     http://www.FreeRTOS.org/support - In return for receiving this top quality\r
  44     embedded software for free we request you assist our global community by\r
  45     participating in the support forum.\r
  46 \r
  47     http://www.FreeRTOS.org/training - Investing in training allows your team to\r
  48     be as productive as possible as early as possible.  Now you can receive\r
  49     FreeRTOS training directly from Richard Barry, CEO of Real Time Engineers\r
  50     Ltd, and the world's leading authority on the world's leading RTOS.\r
  51 \r
  52     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  53     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  54     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  55 \r
  56     http://www.FreeRTOS.org/labs - Where new FreeRTOS products go to incubate.\r
  57     Come and try FreeRTOS+TCP, our new open source TCP/IP stack for FreeRTOS.\r
  58 \r
  59     http://www.OpenRTOS.com - Real Time Engineers ltd. license FreeRTOS to High\r
  60     Integrity Systems ltd. to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  61     licenses offer ticketed support, indemnification and commercial middleware.\r
  62 \r
  63     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  64     engineered and independently SIL3 certified version for use in safety and\r
  65     mission critical applications that require provable dependability.\r
  66 \r
  67     1 tab == 4 spaces!\r
  68 */\r
  69 \r
  70 #if defined( __dsPIC30F__ ) || defined( __dsPIC33F__ )\r
  71 \r
  72         .global _vPortYield\r
  73                 .extern _vTaskSwitchContext\r
  74                 .extern uxCriticalNesting\r
  75 \r
  76 _vPortYield:\r
  77 \r
  78                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  79                 PUSH    W0                                              /* ....then disable interrupts. */\r
  80                 MOV             #32, W0\r
  81                 MOV             W0, SR\r
  82                 PUSH    W1                                              /* Save registers to the stack. */\r
  83                 PUSH.D  W2\r
  84                 PUSH.D  W4\r
  85                 PUSH.D  W6\r
  86                 PUSH.D  W8\r
  87                 PUSH.D  W10\r
  88                 PUSH.D  W12\r
  89                 PUSH    W14\r
  90                 PUSH    RCOUNT\r
  91                 PUSH    TBLPAG\r
  92                 PUSH    ACCAL\r
  93                 PUSH    ACCAH\r
  94                 PUSH    ACCAU\r
  95                 PUSH    ACCBL\r
  96                 PUSH    ACCBH\r
  97                 PUSH    ACCBU\r
  98                 PUSH    DCOUNT\r
  99                 PUSH    DOSTARTL\r
 100                 PUSH    DOSTARTH\r
 101                 PUSH    DOENDL\r
 102                 PUSH    DOENDH\r
 103 \r
 104 \r
 105                 PUSH    CORCON\r
 106                 PUSH    PSVPAG\r
 107                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
 108                 PUSH    W0\r
 109                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
 110                 MOV             W15, [W0]\r
 111 \r
 112                 call    _vTaskSwitchContext\r
 113 \r
 114                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
 115                 MOV             [W0], W15\r
 116                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
 117                 MOV             W0, _uxCriticalNesting\r
 118                 POP             PSVPAG\r
 119                 POP             CORCON\r
 120                 POP             DOENDH\r
 121                 POP             DOENDL\r
 122                 POP             DOSTARTH\r
 123                 POP             DOSTARTL\r
 124                 POP             DCOUNT\r
 125                 POP             ACCBU\r
 126                 POP             ACCBH\r
 127                 POP             ACCBL\r
 128                 POP             ACCAU\r
 129                 POP             ACCAH\r
 130                 POP             ACCAL\r
 131                 POP             TBLPAG\r
 132                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 133                 POP             W14\r
 134                 POP.D   W12\r
 135                 POP.D   W10\r
 136                 POP.D   W8\r
 137                 POP.D   W6\r
 138                 POP.D   W4\r
 139                 POP.D   W2\r
 140                 POP.D   W0\r
 141                 POP             SR\r
 142 \r
 143         return\r
 144 \r
 145         .end\r
 146 \r
 147 #endif /* defined( __dsPIC30F__ ) || defined( __dsPIC33F__ ) */\r
 148 \r