git.sur5r.net Git - freertos/blob - FreeRTOS/Source/portable/Rowley/MSP430F449/portext.asm

   1 /*\r
   2     FreeRTOS V7.5.0 - Copyright (C) 2013 Real Time Engineers Ltd.\r
   3 \r
   4     VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   5 \r
   6     ***************************************************************************\r
   7      *                                                                       *\r
   8      *    FreeRTOS provides completely free yet professionally developed,    *\r
   9      *    robust, strictly quality controlled, supported, and cross          *\r
  10      *    platform software that has become a de facto standard.             *\r
  11      *                                                                       *\r
  12      *    Help yourself get started quickly and support the FreeRTOS         *\r
  13      *    project by purchasing a FreeRTOS tutorial book, reference          *\r
  14      *    manual, or both from: http://www.FreeRTOS.org/Documentation        *\r
  15      *                                                                       *\r
  16      *    Thank you!                                                         *\r
  17      *                                                                       *\r
  18     ***************************************************************************\r
  19 \r
  20     This file is part of the FreeRTOS distribution.\r
  21 \r
  22     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  23     the terms of the GNU General Public License (version 2) as published by the\r
  24     Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.\r
  25 \r
  26     >>! NOTE: The modification to the GPL is included to allow you to distribute\r
  27     >>! a combined work that includes FreeRTOS without being obliged to provide\r
  28     >>! the source code for proprietary components outside of the FreeRTOS\r
  29     >>! kernel.\r
  30 \r
  31     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  32     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  33     FOR A PARTICULAR PURPOSE.  Full license text is available from the following\r
  34     link: http://www.freertos.org/a00114.html\r
  35 \r
  36     1 tab == 4 spaces!\r
  37 \r
  38     ***************************************************************************\r
  39      *                                                                       *\r
  40      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  41      *    not run, what could be wrong?"                                     *\r
  42      *                                                                       *\r
  43      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  44      *                                                                       *\r
  45     ***************************************************************************\r
  46 \r
  47     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  48     license and Real Time Engineers Ltd. contact details.\r
  49 \r
  50     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  51     including FreeRTOS+Trace - an indispensable productivity tool, a DOS\r
  52     compatible FAT file system, and our tiny thread aware UDP/IP stack.\r
  53 \r
  54     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  55     Integrity Systems to sell under the OpenRTOS brand.  Low cost OpenRTOS\r
  56     licenses offer ticketed support, indemnification and middleware.\r
  57 \r
  58     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  59     engineered and independently SIL3 certified version for use in safety and\r
  60     mission critical applications that require provable dependability.\r
  61 \r
  62     1 tab == 4 spaces!\r
  63 */\r
  64 \r
  65 #include "FreeRTOSConfig.h"\r
  66 #include "portasm.h"\r
  67 \r
  68 \r
  69 .CODE\r
  70 \r
  71 /*\r
  72  * The RTOS tick ISR.\r
  73  *\r
  74  * If the cooperative scheduler is in use this simply increments the tick \r
  75  * count.\r
  76  *\r
  77  * If the preemptive scheduler is in use a context switch can also occur.\r
  78  */\r
  79 _vTickISR:\r
  80                 portSAVE_CONTEXT\r
  81                                 \r
  82                 call    #_xTaskIncrementTick\r
  83                 cmp.w   #0x00, r15\r
  84                 jeq     _SkipContextSwitch\r
  85                 call    #_vTaskSwitchContext\r
  86 _SkipContextSwitch:             \r
  87                 portRESTORE_CONTEXT\r
  88 /*-----------------------------------------------------------*/\r
  89 \r
  90 \r
  91 /*\r
  92  * Manual context switch called by the portYIELD() macro.\r
  93  */                \r
  94 _vPortYield::\r
  95 \r
  96                 /* Mimic an interrupt by pushing the SR. */\r
  97                 push    SR                      \r
  98 \r
  99                 /* Now the SR is stacked we can disable interrupts. */\r
 100                 dint                    \r
 101                                 \r
 102                 /* Save the context of the current task. */\r
 103                 portSAVE_CONTEXT                        \r
 104 \r
 105                 /* Switch to the highest priority task that is ready to run. */\r
 106                 call    #_vTaskSwitchContext            \r
 107 \r
 108                 /* Restore the context of the new task. */\r
 109                 portRESTORE_CONTEXT\r
 110 /*-----------------------------------------------------------*/\r
 111 \r
 112 \r
 113 /*\r
 114  * Start off the scheduler by initialising the RTOS tick timer, then restoring\r
 115  * the context of the first task.\r
 116  */\r
 117 _xPortStartScheduler::\r
 118 \r
 119                 /* Setup the hardware to generate the tick.  Interrupts are disabled \r
 120                 when this function is called. */\r
 121                 call    #_prvSetupTimerInterrupt\r
 122 \r
 123                 /* Restore the context of the first task that is going to run. */\r
 124                 portRESTORE_CONTEXT\r
 125 /*-----------------------------------------------------------*/          \r
 126                 \r
 127 \r
 128                 /* Place the tick ISR in the correct vector. */\r
 129                 .VECTORS\r
 130                 \r
 131                 .KEEP\r
 132                 \r
 133                 ORG             TIMERA0_VECTOR\r
 134                 DW              _vTickISR\r
 135                 \r
 136 \r
 137 \r
 138                 END\r
 139                 \r