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137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
/* $NetBSD: lock.h,v 1.1 2014/09/03 19:34:26 matt Exp $ */
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/*-
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* Copyright (c) 2014 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 Matt Thomas of 3am Software Foundry.
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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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/*
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* Machine-dependent spin lock operations.
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*/
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#ifndef _OR1K_LOCK_H_
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#define _OR1K_LOCK_H_
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static __inline int
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__SIMPLELOCK_LOCKED_P(__cpu_simple_lock_t *__ptr)
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{
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return *__ptr != __SIMPLELOCK_UNLOCKED;
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}
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static __inline int
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__SIMPLELOCK_UNLOCKED_P(__cpu_simple_lock_t *__ptr)
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{
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return *__ptr == __SIMPLELOCK_UNLOCKED;
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}
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static __inline void
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__cpu_simple_lock_clear(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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__atomic_clear(__ptr, __ATOMIC_RELAXED);
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#else
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*__ptr = __SIMPLELOCK_UNLOCKED;
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#endif
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}
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static __inline void
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__cpu_simple_lock_set(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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(void)__atomic_test_and_set(__ptr, __ATOMIC_RELAXED);
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#else
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*__ptr = __SIMPLELOCK_LOCKED;
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#endif
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}
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static __inline void __unused
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__cpu_simple_lock_init(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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__atomic_clear(__ptr, __ATOMIC_RELAXED);
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#else
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*__ptr = __SIMPLELOCK_UNLOCKED;
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#endif
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}
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static __inline void __unused
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__cpu_simple_lock(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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while (__atomic_test_and_set(__ptr, __ATOMIC_ACQUIRE)) {
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/* do nothing */
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}
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#else
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int tmp;
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__asm(
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"1:"
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"\t" "l.lwa %[tmp],0(%[ptr])"
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"\n\t" "l.sfeqi\t%[tmp],%[unlocked]"
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"\n\t" "l.bnf 1b"
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"\n\t" "l.nop"
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"\n\t" "l.swa 0(%[ptr]),%[newval]"
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"\n\t" "l.bnf 1b"
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"\n\t" "l.nop"
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: [tmp] "=&r" (tmp)
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: [newval] "r" (__SIMPLELOCK_LOCKED),
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[ptr] "r" (__ptr),
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[unlocked] "n" (__SIMPLELOCK_UNLOCKED));
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#endif
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}
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static __inline int __unused
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__cpu_simple_lock_try(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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return !__atomic_test_and_set(__ptr, __ATOMIC_ACQUIRE);
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#else
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int oldval;
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__asm(
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"1:"
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"\t" "l.lwa %[oldval],0(%[ptr])"
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"\n\t" "l.swa 0(%[ptr]),%[newval]"
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"\n\t" "l.bnf 1b"
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"\n\t" "l.nop"
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: [oldval] "=&r" (oldval)
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: [newval] "r" (__SIMPLELOCK_LOCKED),
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[ptr] "r" (__ptr));
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return oldval == __SIMPLELOCK_UNLOCKED;
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#endif
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}
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static __inline void __unused
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__cpu_simple_unlock(__cpu_simple_lock_t *__ptr)
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{
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#if 0
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__atomic_clear(__ptr, __ATOMIC_RELEASE);
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#else
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*__ptr = __SIMPLELOCK_UNLOCKED;
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#endif
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}
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#endif /* _OR1K_LOCK_H_ */
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