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/* $OpenBSD: lock.h,v 1.2 2009/09/15 04:54:31 syuu Exp $ */
/* public domain */
#ifndef _MIPS64_LOCK_H_
#define _MIPS64_LOCK_H_
typedef volatile u_int __cpu_simple_lock_t;
#define __SIMPLELOCK_LOCKED 1
#define __SIMPLELOCK_UNLOCKED 0
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, new;
do {
new = __SIMPLELOCK_LOCKED;
__asm__ __volatile__
("1:\tll\t%0, %1\n"
"\tsc\t%2, %1\n"
"\tbeqz\t%2, 1b\n"
"\t nop" : "=&r" (old) : "m" (*l), "r" (new));
} while (old != __SIMPLELOCK_UNLOCKED);
}
static __inline__ int
__cpu_simple_lock_try(__cpu_simple_lock_t *l)
{
__cpu_simple_lock_t old, new = __SIMPLELOCK_LOCKED;
__asm__ __volatile__
("1:\tll\t%0, %1\n"
"\tsc\t%2, %1\n"
"\tbeqz\t%2, 1b\n"
"\t nop" : "=&r" (old) : "m" (*l), "r" (new));
return (old == __SIMPLELOCK_UNLOCKED);
}
static __inline__ void
__cpu_simple_unlock(__cpu_simple_lock_t *l)
{
*l = __SIMPLELOCK_UNLOCKED;
}
#endif /* _MIPS64_LOCK_H_ */
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