2 ; FreeRTOS V6.0.2 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 ; ***************************************************************************
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8 ; * + New to FreeRTOS, *
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9 ; * + Wanting to learn FreeRTOS or multitasking in general quickly *
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10 ; * + Looking for basic training, *
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11 ; * + Wanting to improve your FreeRTOS skills and productivity *
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13 ; * then take a look at the FreeRTOS eBook *
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15 ; * "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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16 ; * http://www.FreeRTOS.org/Documentation *
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18 ; * A pdf reference manual is also available. Both are usually delivered *
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19 ; * to your inbox within 20 minutes to two hours when purchased between 8am *
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20 ; * and 8pm GMT (although please allow up to 24 hours in case of *
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21 ; * exceptional circumstances). Thank you for your support! *
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23 ; ***************************************************************************
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25 ; This file is part of the FreeRTOS distribution.
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27 ; FreeRTOS is free software; you can redistribute it and/or modify it under
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28 ; the terms of the GNU General Public License (version 2) as published by the
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29 ; Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 ; ***NOTE*** The exception to the GPL is included to allow you to distribute
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31 ; a combined work that includes FreeRTOS without being obliged to provide the
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32 ; source code for proprietary components outside of the FreeRTOS kernel.
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33 ; FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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34 ; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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35 ; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 ; more details. You should have received a copy of the GNU General Public
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37 ; License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 ; can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 ; by writing to Richard Barry, contact details for whom are available on the
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40 ; FreeRTOS WEB site.
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42 ; 1 tab == 4 spaces!
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44 ; http://www.FreeRTOS.org - Documentation, latest information, license and
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47 ; http://www.SafeRTOS.com - A version that is certified for use in safety
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50 ; http://www.OpenRTOS.com - Commercial support, development, porting,
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51 ; licensing and training services.
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54 .import _pxCurrentTCB
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55 .import _vTaskSwitchContext
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56 .import _vTaskIncrementTick
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58 .export _vPortStartFirstTask
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59 .export _ulPortGetGBR
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61 .export _vPortPreemptiveTick
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62 .export _vPortCooperativeTick
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66 .macro portSAVE_CONTEXT
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68 ; Save r0 to r14 and pr.
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71 ; Save mac1, mach and gbr
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76 ; Get the address of pxCurrentTCB
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77 mov.l #_pxCurrentTCB, r0
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79 ; Get the address of pxTopOfStack from the TCB.
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82 ; Save the stack pointer in pxTopOfStack.
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87 ;-----------------------------------------------------------
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89 .macro portRESTORE_CONTEXT
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91 ; Get the address of the pxCurrentTCB variable.
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92 mov.l #_pxCurrentTCB, r0
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94 ; Get the address of the task stack from pxCurrentTCB.
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97 ; Get the task stack itself into the stack pointer.
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100 ; Restore system registers.
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105 ; Restore r0 to r14 and PR
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108 ; Pop the SR and PC to jump to the start of the task.
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113 ;-----------------------------------------------------------
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115 _vPortStartFirstTask:
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117 portRESTORE_CONTEXT
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119 ;-----------------------------------------------------------
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123 ; Push r0 so it can be used.
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126 ; Set the interrupt mask in the status register.
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131 ; Restore r0 so its original value can be saved by the movml.l instruction
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132 ; below, without ending up with two copies on the stack.
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137 mov.l #_vTaskSwitchContext, r0
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141 portRESTORE_CONTEXT
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143 ;-----------------------------------------------------------
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145 _vPortPreemptiveTick
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149 mov.l #_vTaskIncrementTick, r0
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153 mov.l #_vTaskSwitchContext, r0
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157 portRESTORE_CONTEXT
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159 ;-----------------------------------------------------------
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161 _vPortCooperativeTick
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165 mov.l #_vTaskIncrementTick, r0
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169 portRESTORE_CONTEXT
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171 ;-----------------------------------------------------------
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