2 FreeRTOS.org V5.3.1 - Copyright (C) 2003-2009 Richard Barry.
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4 This file is part of the FreeRTOS.org distribution.
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6 FreeRTOS.org is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License (version 2) as published
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8 by the 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.org without being obliged to provide
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11 the source code for any proprietary components. Alternative commercial
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12 license and support terms are also available upon request. See the
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13 licensing section of http://www.FreeRTOS.org for full details.
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15 FreeRTOS.org is distributed in the hope that it will be useful, but WITHOUT
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16 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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17 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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20 You should have received a copy of the GNU General Public License along
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21 with FreeRTOS.org; if not, write to the Free Software Foundation, Inc., 59
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22 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ***************************************************************************
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27 * Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
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29 * This is a concise, step by step, 'hands on' guide that describes both *
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30 * general multitasking concepts and FreeRTOS specifics. It presents and *
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31 * explains numerous examples that are written using the FreeRTOS API. *
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32 * Full source code for all the examples is provided in an accompanying *
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35 ***************************************************************************
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39 Please ensure to read the configuration and relevant port sections of the
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40 online documentation.
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42 http://www.FreeRTOS.org - Documentation, latest information, license and
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45 http://www.SafeRTOS.com - A version that is certified for use in safety
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48 http://www.OpenRTOS.com - Commercial support, development, porting,
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49 licensing and training services.
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53 * Purpose: Lowest level routines for all ColdFire processors.
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57 * ulPortSetIPL() and mcf5xxx_wr_cacr() copied with permission from FreeScale
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58 * supplied source files.
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61 .global ulPortSetIPL
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62 .global mcf5xxx_wr_cacr
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63 .global __cs3_isr_interrupt_80
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64 .global vPortStartFirstTask
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68 .macro portSAVE_CONTEXT
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70 lea.l (-60, %sp), %sp
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71 movem.l %d0-%fp, (%sp)
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72 move.l pxCurrentTCB, %a0
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77 .macro portRESTORE_CONTEXT
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79 move.l pxCurrentTCB, %a0
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81 movem.l (%sp), %d0-%fp
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87 /********************************************************************/
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89 * This routines changes the IPL to the value passed into the routine.
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90 * It also returns the old IPL value back.
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91 * Calling convention from C:
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92 * old_ipl = asm_set_ipl(new_ipl);
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93 * For the Diab Data C compiler, it passes return value thru D0.
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94 * Note that only the least significant three bits of the passed
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102 move.w SR,D7 /* current sr */
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104 move.l D7,D0 /* prepare return value */
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105 andi.l #0x0700,D0 /* mask out IPL */
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106 lsr.l #8,D0 /* IPL */
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108 move.l 8(A6),D6 /* get argument */
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109 andi.l #0x07,D6 /* least significant three bits */
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110 lsl.l #8,D6 /* move over to make mask */
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112 andi.l #0x0000F8FF,D7 /* zero out current IPL */
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113 or.l D6,D7 /* place new IPL in sr */
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120 /********************************************************************/
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124 .long 0x4e7b0002 /* movec d0,cacr */
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128 /********************************************************************/
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130 /* Yield interrupt. */
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131 __cs3_isr_interrupt_80:
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133 jsr vPortYieldHandler
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134 portRESTORE_CONTEXT
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136 /********************************************************************/
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139 vPortStartFirstTask:
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140 portRESTORE_CONTEXT
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