2 FreeRTOS V7.2.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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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 modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or 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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44 ***************************************************************************
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46 * Having a problem? Start by reading the FAQ "My application does *
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47 * not run, what could be wrong? *
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49 * http://www.FreeRTOS.org/FAQHelp.html *
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51 ***************************************************************************
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54 http://www.FreeRTOS.org - Documentation, training, latest information,
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55 license and contact details.
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57 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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58 including FreeRTOS+Trace - an indispensable productivity tool.
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60 Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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61 the code with commercial support, indemnification, and middleware, under
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62 the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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63 provide a safety engineered and independently SIL3 certified version under
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64 the SafeRTOS brand: http://www.SafeRTOS.com.
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68 * Purpose: Lowest level routines for all ColdFire processors.
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72 * ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale
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73 * supplied source files.
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76 .global ulPortSetIPL
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77 .global _ulPortSetIPL
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78 .global mcf5xxx_wr_cacrx
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79 .global _mcf5xxx_wr_cacrx
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80 .global vPortYieldISR
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81 .global _vPortYieldISR
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82 .global vPortStartFirstTask
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83 .global _vPortStartFirstTask
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84 .extern _pxCurrentTCB
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85 .extern _vPortYieldHandler
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89 .macro portSAVE_CONTEXT
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93 move.l _pxCurrentTCB, a0
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98 .macro portRESTORE_CONTEXT
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100 move.l _pxCurrentTCB, a0
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102 movem.l (sp), d0-a6
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108 /********************************************************************/
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110 * This routines changes the IPL to the value passed into the routine.
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111 * It also returns the old IPL value back.
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112 * Calling convention from C:
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113 * old_ipl = asm_set_ipl(new_ipl);
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114 * For the Diab Data C compiler, it passes return value thru D0.
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115 * Note that only the least significant three bits of the passed
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124 move.w SR,D7 /* current sr */
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126 move.l D7,D6 /* prepare return value */
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127 andi.l #0x0700,D6 /* mask out IPL */
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128 lsr.l #8,D6 /* IPL */
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130 andi.l #0x07,D0 /* least significant three bits */
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131 lsl.l #8,D0 /* move over to make mask */
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133 andi.l #0x0000F8FF,D7 /* zero out current IPL */
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134 or.l D0,D7 /* place new IPL in sr */
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137 move.l D6, D0 /* Return value in D0. */
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142 /********************************************************************/
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147 .long 0x4e7b0002 /* movec d0,cacr */
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151 /********************************************************************/
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153 /* Yield interrupt. */
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157 jsr _vPortYieldHandler
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158 portRESTORE_CONTEXT
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160 /********************************************************************/
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163 vPortStartFirstTask:
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164 _vPortStartFirstTask:
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165 portRESTORE_CONTEXT
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