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/* $OpenBSD: lock.h,v 1.6 2011/03/23 16:54:37 pirofti Exp $ */
/* public domain */
#ifndef _MACHINE_LOCK_H_
#define _MACHINE_LOCK_H_
#include <machine/atomic.h>
#include <machine/ctlreg.h>
typedef volatile u_int8_t __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 0xff
#define __SIMPLELOCK_UNLOCKED 0x00
static __inline__ void
__cpu_simple_lock_init(__cpu_simple_lock_t *l)
{
*l = __SIMPLELOCK_UNLOCKED;
}
static __inline__ void
__cpu_simple_lock(__cpu_simple_lock_t *l)
{
__cpu_simple_lock_t old;
do {
old = __SIMPLELOCK_LOCKED;
__asm__ __volatile__
("ldstub [%0], %1" : "=r" (l), "=r" (old) : "0" (l));
membar(LoadLoad | LoadStore);
} while (old != __SIMPLELOCK_UNLOCKED);
}
static __inline__ int
__cpu_simple_lock_try(__cpu_simple_lock_t *l)
{
__cpu_simple_lock_t old = __SIMPLELOCK_LOCKED;
__asm__ __volatile__
("ldstub [%0], %1" : "=r" (l), "=r" (old) : "0" (l));
membar(LoadLoad | LoadStore);
return (old == __SIMPLELOCK_UNLOCKED);
}
static __inline__ void
__cpu_simple_unlock(__cpu_simple_lock_t *l)
{
membar(StoreStore | LoadStore);
*l = __SIMPLELOCK_UNLOCKED;
}
#define rw_cas(p, o, n) (sparc64_casx(p, o, n) != o)
#endif /* _MACHINE_LOCK_H_ */
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