9b4c0e34d2
x86-64. Since there's no hardware available yet, this port is only known to run on the Simics simulator for at the moment, and as such uses the PC devices that it simulates for now. It will be developed more (and cleaned up) as the hardware becomes available.
99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
/* $NetBSD: lock.h,v 1.1 2001/06/19 00:20:11 fvdl Exp $ */
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/*-
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* Copyright (c) 2000 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 Jason R. Thorpe.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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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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/*
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* Machine-dependent spin lock operations.
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*/
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#ifndef _X86_64_LOCK_H_
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#define _X86_64_LOCK_H_
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typedef __volatile int __cpu_simple_lock_t;
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#define __SIMPLELOCK_LOCKED 1
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#define __SIMPLELOCK_UNLOCKED 0
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static __inline void __cpu_simple_lock_init __P((__cpu_simple_lock_t *))
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__attribute__((__unused__));
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static __inline void __cpu_simple_lock __P((__cpu_simple_lock_t *))
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__attribute__((__unused__));
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static __inline int __cpu_simple_lock_try __P((__cpu_simple_lock_t *))
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__attribute__((__unused__));
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static __inline void __cpu_simple_unlock __P((__cpu_simple_lock_t *))
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__attribute__((__unused__));
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static __inline void
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__cpu_simple_lock_init(__cpu_simple_lock_t *alp)
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{
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*alp = __SIMPLELOCK_UNLOCKED;
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}
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static __inline void
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__cpu_simple_lock(__cpu_simple_lock_t *alp)
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{
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int __val = __SIMPLELOCK_LOCKED;
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do {
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__asm __volatile("xchgl %0, %2"
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: "=r" (__val)
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: "0" (__val), "m" (*alp));
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} while (__val != __SIMPLELOCK_UNLOCKED);
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}
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static __inline int
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__cpu_simple_lock_try(__cpu_simple_lock_t *alp)
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{
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int __val = __SIMPLELOCK_LOCKED;
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__asm __volatile("xchgl %0, %2"
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: "=r" (__val)
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: "0" (__val), "m" (*alp));
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return ((__val == __SIMPLELOCK_UNLOCKED) ? 1 : 0);
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}
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void
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__cpu_simple_unlock(__cpu_simple_lock_t *alp)
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{
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*alp = __SIMPLELOCK_UNLOCKED;
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}
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#endif /* _X86_64_LOCK_H_ */
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