1 #ifndef _ALPHA_SPINLOCK_H
2 #define _ALPHA_SPINLOCK_H
4 #include <linux/kernel.h>
5 #include <asm/current.h>
8 * Simple spin lock operations. There are two variants, one clears IRQ's
9 * on the local processor, one does not.
11 * We make no fairness assumptions. They have a cost.
14 #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
15 #define arch_spin_is_locked(x) ((x)->lock != 0)
16 #define arch_spin_unlock_wait(x) \
17 do { cpu_relax(); } while ((x)->lock)
19 static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
21 return lock.lock == 0;
24 static inline void arch_spin_unlock(arch_spinlock_t * lock)
30 static inline void arch_spin_lock(arch_spinlock_t * lock)
46 : "=&r" (tmp), "=m" (lock->lock)
47 : "m"(lock->lock) : "memory");
50 static inline int arch_spin_trylock(arch_spinlock_t *lock)
52 return !test_and_set_bit(0, &lock->lock);
55 /***********************************************************/
57 static inline int arch_read_can_lock(arch_rwlock_t *lock)
59 return (lock->lock & 1) == 0;
62 static inline int arch_write_can_lock(arch_rwlock_t *lock)
64 return lock->lock == 0;
67 static inline void arch_read_lock(arch_rwlock_t *lock)
83 : "=m" (*lock), "=&r" (regx)
84 : "m" (*lock) : "memory");
87 static inline void arch_write_lock(arch_rwlock_t *lock)
103 : "=m" (*lock), "=&r" (regx)
104 : "m" (*lock) : "memory");
107 static inline int arch_read_trylock(arch_rwlock_t * lock)
112 __asm__ __volatile__(
123 : "=m" (*lock), "=&r" (regx), "=&r" (success)
124 : "m" (*lock) : "memory");
129 static inline int arch_write_trylock(arch_rwlock_t * lock)
134 __asm__ __volatile__(
145 : "=m" (*lock), "=&r" (regx), "=&r" (success)
146 : "m" (*lock) : "memory");
151 static inline void arch_read_unlock(arch_rwlock_t * lock)
154 __asm__ __volatile__(
163 : "=m" (*lock), "=&r" (regx)
164 : "m" (*lock) : "memory");
167 static inline void arch_write_unlock(arch_rwlock_t * lock)
173 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
174 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
176 #endif /* _ALPHA_SPINLOCK_H */