mirror of https://github.com/acidanthera/audk.git
108 lines
3.5 KiB
C
108 lines
3.5 KiB
C
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/* $NetBSD: acpi_func.h,v 1.2 2006/05/14 21:55:38 elad Exp $ */
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/*-
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* Copyright (c) 2002 Mitsuru IWASAKI
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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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* $FreeBSD: src/sys/ia64/include/acpica_machdep.h,v 1.4 2004/10/11 05:39:15 njl Exp $
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*/
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/******************************************************************************
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*
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* Name: acpica_machdep.h - arch-specific defines, etc.
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* $Revision: 1.2 $
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*
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*****************************************************************************/
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#ifndef _IA64_ACPI_FUNC_H_
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#define _IA64_ACPI_FUNC_H_
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#include <machine/cpufunc.h>
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#include <machine/atomic.h>
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/* Asm macros */
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#define ACPI_ASM_MACROS
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#define BREAKPOINT3
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#define ACPI_DISABLE_IRQS() disable_intr()
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#define ACPI_ENABLE_IRQS() enable_intr()
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#define ACPI_FLUSH_CPU_CACHE() /* XXX ia64_fc()? */
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/* Section 5.2.9.1: global lock acquire/release functions */
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extern int acpi_acquire_global_lock(uint32_t *lock);
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extern int acpi_release_global_lock(uint32_t *lock);
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#define ACPI_ACQUIRE_GLOBAL_LOCK(GLptr, Acq) \
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((Acq) = acpi_acquire_global_lock(GLptr))
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#define ACPI_RELEASE_GLOBAL_LOCK(GLptr, Acq) \
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((Acq) = acpi_release_global_lock(GLptr))
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/* Section 5.2.9.1: global lock acquire/release functions */
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#define GL_ACQUIRED (-1)
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#define GL_BUSY 0
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#define GL_BIT_PENDING 0x1
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#define GL_BIT_OWNED 0x2
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#define GL_BIT_MASK (GL_BIT_PENDING | GL_BIT_OWNED)
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/*
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* Acquire the global lock. If busy, set the pending bit. The caller
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* will wait for notification from the BIOS that the lock is available
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* and then attempt to acquire it again.
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*/
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int
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acpi_acquire_global_lock(uint32_t *lock)
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{
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uint32_t new, old;
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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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} while (atomic_cmpset_acq_int(lock, old, new) == 0);
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return ((new < GL_BIT_MASK) ? GL_ACQUIRED : GL_BUSY);
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}
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/*
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* Release the global lock, returning whether there is a waiter pending.
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* If the BIOS set the pending bit, OSPM must notify the BIOS when it
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* releases the lock.
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*/
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int
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acpi_release_global_lock(uint32_t *lock)
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{
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uint32_t new, old;
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do {
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old = *lock;
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new = old & ~GL_BIT_MASK;
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} while (atomic_cmpset_rel_int(lock, old, new) == 0);
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return (old & GL_BIT_PENDING);
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}
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#endif /* _IA64_ACPI_FUNC_H_ */
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