1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ALPHA_SPINLOCK_H
3 #define _ALPHA_SPINLOCK_H
5 #include <linux/kernel.h>
6 #include <asm/current.h>
7 #include <asm/barrier.h>
8 #include <asm/processor.h>
11 * Simple spin lock operations. There are two variants, one clears IRQ's
12 * on the local processor, one does not.
14 * We make no fairness assumptions. They have a cost.
17 #define arch_spin_is_locked(x) ((x)->lock != 0)
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 void arch_read_lock(arch_rwlock_t *lock)
73 : "=m" (*lock), "=&r" (regx)
74 : "m" (*lock) : "memory");
77 static inline void arch_write_lock(arch_rwlock_t *lock)
93 : "=m" (*lock), "=&r" (regx)
94 : "m" (*lock) : "memory");
97 static inline int arch_read_trylock(arch_rwlock_t * lock)
102 __asm__ __volatile__(
113 : "=m" (*lock), "=&r" (regx), "=&r" (success)
114 : "m" (*lock) : "memory");
119 static inline int arch_write_trylock(arch_rwlock_t * lock)
124 __asm__ __volatile__(
135 : "=m" (*lock), "=&r" (regx), "=&r" (success)
136 : "m" (*lock) : "memory");
141 static inline void arch_read_unlock(arch_rwlock_t * lock)
144 __asm__ __volatile__(
153 : "=m" (*lock), "=&r" (regx)
154 : "m" (*lock) : "memory");
157 static inline void arch_write_unlock(arch_rwlock_t * lock)
163 #endif /* _ALPHA_SPINLOCK_H */