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126 lines
3.6 KiB
C
126 lines
3.6 KiB
C
/* $NetBSD: spinlock.h,v 1.6 2015/01/01 01:15:42 mrg Exp $ */
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/*-
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* Copyright (c) 2013 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Taylor R. Campbell.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_SPINLOCK_H_
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#define _LINUX_SPINLOCK_H_
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#include <sys/cdefs.h>
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#include <sys/mutex.h>
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#define __acquires(lock) /* XXX lockdep stuff */
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#define __releases(lock) /* XXX lockdep stuff */
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typedef struct spinlock {
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kmutex_t sl_lock;
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} spinlock_t;
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static inline int
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spin_is_locked(spinlock_t *spinlock)
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{
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return mutex_owned(&spinlock->sl_lock);
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}
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static inline void
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spin_lock(spinlock_t *spinlock)
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{
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mutex_enter(&spinlock->sl_lock);
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}
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static inline void
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spin_unlock(spinlock_t *spinlock)
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{
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mutex_exit(&spinlock->sl_lock);
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}
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static inline void
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spin_lock_irq(spinlock_t *spinlock)
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{
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spin_lock(spinlock);
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}
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static inline void
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spin_unlock_irq(spinlock_t *spinlock)
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{
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spin_unlock(spinlock);
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}
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/* Must be a macro because the second argument is to be assigned. */
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#define spin_lock_irqsave(SPINLOCK, FLAGS) \
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do { \
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(FLAGS) = 0; \
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mutex_enter(&((spinlock_t *)(SPINLOCK))->sl_lock); \
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} while (0)
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static inline void
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spin_unlock_irqrestore(spinlock_t *spinlock, unsigned long __unused flags)
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{
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mutex_exit(&spinlock->sl_lock);
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}
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static inline void
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spin_lock_init(spinlock_t *spinlock)
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{
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/* XXX What's the right IPL? IPL_DRM...? */
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mutex_init(&spinlock->sl_lock, MUTEX_DEFAULT, IPL_VM);
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}
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/*
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* XXX Linux doesn't ever destroy spin locks, it seems. We'll have to
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* kludge it up.
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*/
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static inline void
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spin_lock_destroy(spinlock_t *spinlock)
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{
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mutex_destroy(&spinlock->sl_lock);
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}
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/* This is a macro to make the panic message clearer. */
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#define assert_spin_locked(spinlock) \
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KASSERT(mutex_owned(&(spinlock)->sl_lock))
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/*
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* Linux rwlocks are reader/writer spin locks. We implement them as
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* normal spin locks without reader/writer semantics for expedience.
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* If that turns out to not work, adapting to reader/writer semantics
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* shouldn't be too hard.
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*/
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#define rwlock_t spinlock_t
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#define rwlock_init spin_lock_init
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#define rwlock_destroy spin_lock_destroy
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#define write_lock_irq spin_lock_irq
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#define write_unlock_irq spin_unlock_irq
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#define read_lock spin_lock
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#define read_unlock spin_unlock
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#endif /* _LINUX_SPINLOCK_H_ */
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