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

   1 /*\r
   2         FreeRTOS.org V5.4.0 - Copyright (C) 2003-2009 Richard Barry.\r
   3 \r
   4         This file is part of the FreeRTOS.org distribution.\r
   5 \r
   6         FreeRTOS.org is free software; you can redistribute it and/or modify it\r
   7         under the terms of the GNU General Public License (version 2) as published\r
   8         by the Free Software Foundation and modified by the FreeRTOS exception.\r
   9         **NOTE** The exception to the GPL is included to allow you to distribute a\r
  10         combined work that includes FreeRTOS.org without being obliged to provide\r
  11         the source code for any proprietary components.  Alternative commercial\r
  12         license and support terms are also available upon request.  See the \r
  13         licensing section of http://www.FreeRTOS.org for full details.\r
  14 \r
  15         FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT\r
  16         ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or\r
  17         FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for\r
  18         more details.\r
  19 \r
  20         You should have received a copy of the GNU General Public License along\r
  21         with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59\r
  22         Temple Place, Suite 330, Boston, MA  02111-1307  USA.\r
  23 \r
  24 \r
  25         ***************************************************************************\r
  26         *                                                                         *\r
  27         * Get the FreeRTOS eBook!  See http://www.FreeRTOS.org/Documentation      *\r
  28         *                                                                         *\r
  29         * This is a concise, step by step, 'hands on' guide that describes both   *\r
  30         * general multitasking concepts and FreeRTOS specifics. It presents and   *\r
  31         * explains numerous examples that are written using the FreeRTOS API.     *\r
  32         * Full source code for all the examples is provided in an accompanying    *\r
  33         * .zip file.                                                              *\r
  34         *                                                                         *\r
  35         ***************************************************************************\r
  36 \r
  37         1 tab == 4 spaces!\r
  38 \r
  39         Please ensure to read the configuration and relevant port sections of the\r
  40         online documentation.\r
  41 \r
  42         http://www.FreeRTOS.org - Documentation, latest information, license and\r
  43         contact details.\r
  44 \r
  45         http://www.SafeRTOS.com - A version that is certified for use in safety\r
  46         critical systems.\r
  47 \r
  48         http://www.OpenRTOS.com - Commercial support, development, porting,\r
  49         licensing and training services.\r
  50 */\r
  51 \r
  52         .global _vPortYield\r
  53                 .extern _vTaskSwitchContext\r
  54                 .extern uxCriticalNesting\r
  55 \r
  56 _vPortYield:\r
  57 \r
  58                 PUSH    SR                                              /* Save the SR used by the task.... */\r
  59                 PUSH    W0                                              /* ....then disable interrupts. */\r
  60                 MOV             #32, W0\r
  61                 MOV             W0, SR\r
  62                 PUSH    W1                                              /* Save registers to the stack. */\r
  63                 PUSH.D  W2\r
  64                 PUSH.D  W4\r
  65                 PUSH.D  W6\r
  66                 PUSH.D  W8\r
  67                 PUSH.D  W10\r
  68                 PUSH.D  W12\r
  69                 PUSH    W14\r
  70                 PUSH    RCOUNT\r
  71                 PUSH    TBLPAG\r
  72                 PUSH    ACCAL\r
  73                 PUSH    ACCAH\r
  74                 PUSH    ACCAU\r
  75                 PUSH    ACCBL\r
  76                 PUSH    ACCBH\r
  77                 PUSH    ACCBU\r
  78                 PUSH    DCOUNT\r
  79                 PUSH    DOSTARTL\r
  80                 PUSH    DOSTARTH\r
  81                 PUSH    DOENDL\r
  82                 PUSH    DOENDH\r
  83                 \r
  84                                                                                                                                                                                 \r
  85                 PUSH    CORCON\r
  86                 PUSH    PSVPAG\r
  87                 MOV             _uxCriticalNesting, W0          /* Save the critical nesting counter for the task. */\r
  88                 PUSH    W0\r
  89                 MOV             _pxCurrentTCB, W0                       /* Save the new top of stack into the TCB. */\r
  90                 MOV             W15, [W0]\r
  91 \r
  92                 call    _vTaskSwitchContext\r
  93 \r
  94                 MOV             _pxCurrentTCB, W0                       /* Restore the stack pointer for the task. */\r
  95                 MOV             [W0], W15\r
  96                 POP             W0                                                      /* Restore the critical nesting counter for the task. */\r
  97                 MOV             W0, _uxCriticalNesting\r
  98                 POP             PSVPAG\r
  99                 POP             CORCON\r
 100                 POP             DOENDH\r
 101                 POP             DOENDL\r
 102                 POP             DOSTARTH\r
 103                 POP             DOSTARTL\r
 104                 POP             DCOUNT\r
 105                 POP             ACCBU\r
 106                 POP             ACCBH\r
 107                 POP             ACCBL\r
 108                 POP             ACCAU\r
 109                 POP             ACCAH\r
 110                 POP             ACCAL\r
 111                 POP             TBLPAG\r
 112                 POP             RCOUNT                                          /* Restore the registers from the stack. */\r
 113                 POP             W14\r
 114                 POP.D   W12\r
 115                 POP.D   W10\r
 116                 POP.D   W8\r
 117                 POP.D   W6\r
 118                 POP.D   W4\r
 119                 POP.D   W2\r
 120                 POP.D   W0\r
 121                 POP             SR\r
 122 \r
 123         return\r
 124 \r
 125         .end\r