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File: [cvs.NetBSD.org] / src / sys / arch / ia64 / include / lock.h (download)

Revision 1.3, Mon Apr 28 20:23:25 2008 UTC (15 years, 11 months ago) by martin
Branch: MAIN
CVS Tags: yamt-pf42-base4, yamt-pf42-base3, yamt-pf42-base2, yamt-nfs-mp-base6, yamt-nfs-mp-base5, yamt-nfs-mp-base4, yamt-nfs-mp-base3, yamt-nfs-mp-base2, wrstuden-revivesa-base-4, wrstuden-revivesa-base-3, wrstuden-revivesa-base-2, wrstuden-revivesa-base-1, wrstuden-revivesa-base, wrstuden-revivesa, simonb-wapbl-nbase, simonb-wapbl-base, simonb-wapbl, nick-hppapmap-base4, nick-hppapmap-base3, nick-hppapmap-base2, nick-hppapmap-base, nick-hppapmap, netbsd-5-base, netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, netbsd-5-0-RELEASE, netbsd-5-0-RC4, netbsd-5-0-RC3, netbsd-5-0-RC2, netbsd-5-0-RC1, netbsd-5-0-2-RELEASE, netbsd-5-0-1-RELEASE, netbsd-5-0, netbsd-5, mjf-devfs2-base, matt-nb5-pq3-base, matt-nb5-pq3, matt-nb5-mips64-u2-k2-k4-k7-k8-k9, matt-nb5-mips64-u1-k1-k5, matt-nb5-mips64-premerge-20101231, matt-nb5-mips64-premerge-20091211, matt-nb5-mips64-k15, matt-nb5-mips64, matt-nb4-mips64-k7-u2a-k9b, matt-mips64-base2, jym-xensuspend, hpcarm-cleanup-nbase, haad-nbase2, haad-dm-base2, haad-dm-base1, haad-dm-base, haad-dm, ad-audiomp2-base, ad-audiomp2
Changes since 1.2: +1 -8 lines

Remove clause 3 and 4 from TNF licenses

/*	$NetBSD: lock.h,v 1.3 2008/04/28 20:23:25 martin Exp $	*/

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Machine-dependent spin lock operations.
 */

#ifndef _IA64_LOCK_H_
#define	_IA64_LOCK_H_

static __inline int
__SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
{
	return *__ptr == __SIMPLELOCK_LOCKED;
}

static __inline int
__SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
{
	return *__ptr == __SIMPLELOCK_UNLOCKED;
}

static __inline void
__cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
{

	*__ptr = __SIMPLELOCK_LOCKED;
}

static __inline void
__cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
{

	*__ptr = __SIMPLELOCK_UNLOCKED;
}

#ifdef _KERNEL

#define	SPINLOCK_SPIN_HOOK	/* nothing */
#define	SPINLOCK_BACKOFF_HOOK	/* XXX(kochi): hint@pause */

#endif

static __inline void __cpu_simple_lock_init(__cpu_simple_lock_t *)
	__unused;
static __inline void __cpu_simple_lock(__cpu_simple_lock_t *)
	__unused;
static __inline int __cpu_simple_lock_try(__cpu_simple_lock_t *)
	__unused;
static __inline void __cpu_simple_unlock(__cpu_simple_lock_t *)
	__unused;

static __inline void
__cpu_simple_lock_init(__cpu_simple_lock_t *lockp)
{

	*lockp = __SIMPLELOCK_UNLOCKED;
	__insn_barrier();
}

static __inline int
__cpu_simple_lock_try(__cpu_simple_lock_t *lockp)
{
	uint8_t val;

	val = __SIMPLELOCK_LOCKED;
/*	__asm volatile ("xchgb %0,(%2)" : 
	    "=r" (val)
	    :"0" (val), "r" (lockp)); */
	__insn_barrier();
	return val == __SIMPLELOCK_UNLOCKED;
}

static __inline void
__cpu_simple_lock(__cpu_simple_lock_t *lockp)
{

	while (!__cpu_simple_lock_try(lockp))
		/* nothing */;
	__insn_barrier();
}

static __inline void
__cpu_simple_unlock(__cpu_simple_lock_t *lockp)
{

	__insn_barrier();
	*lockp = __SIMPLELOCK_UNLOCKED;
}

#endif /* _IA64_LOCK_H_ */