28bb01e5ba
Tested with Freescale dual-core MPC8572DS development system. Obtained from: Freescale, Semihalf
68 lines
2.6 KiB
C
68 lines
2.6 KiB
C
/*-
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* Copyright (c) 1997 Berkeley Software Design, Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Berkeley Software Design Inc's name may not be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY BERKELEY SOFTWARE DESIGN INC ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL BERKELEY SOFTWARE DESIGN INC BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from BSDI $Id: mutex.h,v 2.7.2.35 2000/04/27 03:10:26 cp Exp $
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* $FreeBSD$
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*/
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#ifndef _MACHINE_MUTEX_H_
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#define _MACHINE_MUTEX_H_
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#if 0
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#ifdef LOCORE
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/*
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* Simple assembly macros to get and release non-recursive spin locks
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*/
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#define MTX_ENTER(lck) \
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mfmsr r10; \ /* disable interrupts */
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rlwinm r0, r10, 0, 17, 15; \
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mtmsr r0; \
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1: li r11, MTX_LOCK; \ /* MTX_LOCK offset */
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lwarx r0, r11, lck; \ /* load current lock value */
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cmplwi r0, r1, MTX_UNOWNED; \ /* compare with unowned */
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beq 1; \ /* if owned, loop */
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lwz r0, PC_CURPROC(pcpup); \ /* load curproc */
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stwcx. r0, r11, lck; \ /* attempt to store */
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beq 1; \ /* loop if failed */
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sync; \ /* sync */
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eieio; \ /* sync */
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stw r10, MTX_SAVEINTR(lck) /* save flags */
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#define MTX_EXIT(lck) \
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sync; \ /* sync */
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eieio; \ /* sync */
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li r0, MTX_UNOWNED; \ /* load in unowned */
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stw r0, MTX_LOCK(lck); \ /* store to lock */
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lwz r0, MTX_SAVEINTR(lck); \ /* load saved flags */
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mtmsr r0 /* enable interrupts */
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#endif /* !LOCORE */
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#endif
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#endif /* __MACHINE_MUTEX_H */
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