2 FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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4 This file is part of the FreeRTOS distribution.
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6 FreeRTOS is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License (version 2) as published by the
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8 Free Software Foundation and modified by the FreeRTOS exception.
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9 **NOTE** The exception to the GPL is included to allow you to distribute a
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10 combined work that includes FreeRTOS without being obliged to provide the
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11 source code for proprietary components outside of the FreeRTOS kernel.
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12 Alternative commercial license and support terms are also available upon
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13 request. See the licensing section of http://www.FreeRTOS.org for full
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16 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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21 You should have received a copy of the GNU General Public License along
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22 with FreeRTOS; if not, write to the Free Software Foundation, Inc., 59
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23 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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26 ***************************************************************************
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28 * The FreeRTOS eBook and reference manual are available to purchase for a *
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29 * small fee. Help yourself get started quickly while also helping the *
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30 * FreeRTOS project! See http://www.FreeRTOS.org/Documentation for details *
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32 ***************************************************************************
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36 Please ensure to read the configuration and relevant port sections of the
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37 online documentation.
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39 http://www.FreeRTOS.org - Documentation, latest information, license and
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42 http://www.SafeRTOS.com - A version that is certified for use in safety
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45 http://www.OpenRTOS.com - Commercial support, development, porting,
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46 licensing and training services.
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50 * Purpose: Lowest level routines for all ColdFire processors.
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54 * ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale
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55 * supplied source files.
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58 .global ulPortSetIPL
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59 .global _ulPortSetIPL
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60 .global mcf5xxx_wr_cacrx
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61 .global _mcf5xxx_wr_cacrx
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62 .global vPortYieldISR
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63 .global _vPortYieldISR
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64 .global vPortStartFirstTask
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65 .global _vPortStartFirstTask
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66 .extern _pxCurrentTCB
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67 .extern _vPortYieldHandler
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71 .macro portSAVE_CONTEXT
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75 move.l _pxCurrentTCB, a0
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80 .macro portRESTORE_CONTEXT
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82 move.l _pxCurrentTCB, a0
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90 /********************************************************************/
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92 * This routines changes the IPL to the value passed into the routine.
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93 * It also returns the old IPL value back.
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94 * Calling convention from C:
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95 * old_ipl = asm_set_ipl(new_ipl);
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96 * For the Diab Data C compiler, it passes return value thru D0.
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97 * Note that only the least significant three bits of the passed
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106 move.w SR,D7 /* current sr */
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108 move.l D7,D6 /* prepare return value */
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109 andi.l #0x0700,D6 /* mask out IPL */
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110 lsr.l #8,D6 /* IPL */
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112 andi.l #0x07,D0 /* least significant three bits */
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113 lsl.l #8,D0 /* move over to make mask */
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115 andi.l #0x0000F8FF,D7 /* zero out current IPL */
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116 or.l D0,D7 /* place new IPL in sr */
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119 move.l D6, D0 /* Return value in D0. */
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124 /********************************************************************/
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129 .long 0x4e7b0002 /* movec d0,cacr */
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133 /********************************************************************/
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135 /* Yield interrupt. */
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139 jsr _vPortYieldHandler
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140 portRESTORE_CONTEXT
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142 /********************************************************************/
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145 vPortStartFirstTask:
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146 _vPortStartFirstTask:
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147 portRESTORE_CONTEXT
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