93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
/* $NetBSD: acpi_func.h,v 1.4 2010/07/24 21:53:54 jruoho Exp $ */
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/*-
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* Copyright (c) 2000 Michael Smith
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* Copyright (c) 2000 BSDi
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* Copyright (c) 2007-2009 Jung-uk Kim <jkim@FreeBSD.org>
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 THE AUTHOR OR CONTRIBUTORS 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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#ifndef _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H
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#define _SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H
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#include <machine/cpufunc.h>
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#include <sys/atomic.h>
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#define GL_ACQUIRED (-1)
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#define GL_BUSY 0
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#define GL_BIT_PENDING 1
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#define GL_BIT_OWNED 2
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#define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED)
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#define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \
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do { \
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(Acq) = acpi_acquire_global_lock(&((GLptr)->GlobalLock)); \
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} while (0)
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#define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \
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do { \
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(Acq) = acpi_release_global_lock(&((GLptr)->GlobalLock)); \
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} while (0)
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static inline int
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acpi_acquire_global_lock(uint32_t *lock)
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{
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uint32_t new, old, val;
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do {
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old = *lock;
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new = ((old & ~GL_BIT_MASK) | GL_BIT_OWNED) |
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((old >> 1) & GL_BIT_PENDING);
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val = atomic_cas_32(lock, old, new);
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} while (__predict_false(val != old));
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return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
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}
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static inline int
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acpi_release_global_lock(uint32_t *lock)
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{
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uint32_t new, old, val;
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do {
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old = *lock;
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new = old & ~GL_BIT_MASK;
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val = atomic_cas_32(lock, old, new);
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} while (__predict_false(val != old));
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return old & GL_BIT_PENDING;
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}
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/*
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* XXX: Should be in a MD header.
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*/
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#ifndef __ia64__
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#define ACPI_FLUSH_CPU_CACHE() wbinvd()
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#else
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#define ACPI_FLUSH_CPU_CACHE() /* XXX: ia64_fc()? */
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#endif
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#endif /* !_SYS_DEV_ACPI_ACPICA_ACPI_FUNC_H */
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