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Implement __cpu_simple_{,un}lock{,try}(), modeled after the Alpha 

implementation.
This commit is contained in:
thorpej 2000-04-29 19:39:51 +00:00
parent 7348e432f3
commit 1dcdb13c04
1 changed files with 48 additions and 1 deletions
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49
sys/arch/i386/include/lock.h
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@ -1,4 +1,4 @@
/* $NetBSD: lock.h,v 1.2 2000/04/29 03:31:49 thorpej Exp $ */
/* $NetBSD: lock.h,v 1.3 2000/04/29 19:39:51 thorpej Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
@ -46,4 +46,51 @@
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
static __inline void __cpu_simple_lock_init __P((__volatile int *))
__attribute__((__unused__));
static __inline void __cpu_simple_lock __P((__volatile int *))
__attribute__((__unused__));
static __inline int __cpu_simple_lock_try __P((__volatile int *))
__attribute__((__unused__));
static __inline void __cpu_simple_unlock __P((__volatile int *))
__attribute__((__unused__));
static __inline void
__cpu_simple_lock_init(__volatile int *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
}
static __inline void
__cpu_simple_lock(__volatile int *alp)
{
int __val = __SIMPLELOCK_LOCKED;
do {
__asm __volatile("xchgl %0, %2"
: "=r" (__val)
: "0" (__val), "m" (*alp));
} while (__val != __SIMPLELOCK_UNLOCKED);
}
static __inline int
__cpu_simple_lock_try(__volatile int *alp)
{
int __val = __SIMPLELOCK_LOCKED;
__asm __volatile("xchgl %0, %2"
: "=r" (__val)
: "0" (__val), "m" (*alp));
return ((__val == __SIMPLELOCK_UNLOCKED) ? 1 : 0);
}
void
__cpu_simple_unlock(__volatile int *alp)
{
*alp = __SIMPLELOCK_UNLOCKED;
}
#endif /* _I386_LOCK_H_ */