Implement __cpu_simple_{,un}lock{,try}(), modeled after the Alpha
implementation.
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@ -1,4 +1,4 @@
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/* $NetBSD: lock.h,v 1.2 2000/04/29 03:31:49 thorpej Exp $ */
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/* $NetBSD: lock.h,v 1.3 2000/04/29 19:39:51 thorpej Exp $ */
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/*-
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* Copyright (c) 2000 The NetBSD Foundation, Inc.
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@ -46,4 +46,51 @@
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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((__volatile int *))
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__attribute__((__unused__));
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static __inline void __cpu_simple_lock __P((__volatile int *))
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__attribute__((__unused__));
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static __inline int __cpu_simple_lock_try __P((__volatile int *))
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__attribute__((__unused__));
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static __inline void __cpu_simple_unlock __P((__volatile int *))
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__attribute__((__unused__));
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static __inline void
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__cpu_simple_lock_init(__volatile int *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(__volatile int *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(__volatile int *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(__volatile int *alp)
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{
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*alp = __SIMPLELOCK_UNLOCKED;
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}
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#endif /* _I386_LOCK_H_ */
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