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_lock_flags(lock, flags) arch_spin_lock(lock)
18 #define arch_spin_is_locked(x) ((x)->lock != 0)
20 static inline int arch_spin_value_unlocked(arch_spinlock_t lock)
22 return lock.lock == 0;
25 static inline void arch_spin_unlock(arch_spinlock_t * lock)
31 static inline void arch_spin_lock(arch_spinlock_t * lock)
47 : "=&r" (tmp), "=m" (lock->lock)
48 : "m"(lock->lock) : "memory");
51 static inline int arch_spin_trylock(arch_spinlock_t *lock)
53 return !test_and_set_bit(0, &lock->lock);
56 /***********************************************************/
58 static inline int arch_read_can_lock(arch_rwlock_t *lock)
60 return (lock->lock & 1) == 0;
63 static inline int arch_write_can_lock(arch_rwlock_t *lock)
65 return lock->lock == 0;
68 static inline void arch_read_lock(arch_rwlock_t *lock)
84 : "=m" (*lock), "=&r" (regx)
85 : "m" (*lock) : "memory");
88 static inline void arch_write_lock(arch_rwlock_t *lock)
104 : "=m" (*lock), "=&r" (regx)
105 : "m" (*lock) : "memory");
108 static inline int arch_read_trylock(arch_rwlock_t * lock)
113 __asm__ __volatile__(
124 : "=m" (*lock), "=&r" (regx), "=&r" (success)
125 : "m" (*lock) : "memory");
130 static inline int arch_write_trylock(arch_rwlock_t * lock)
135 __asm__ __volatile__(
146 : "=m" (*lock), "=&r" (regx), "=&r" (success)
147 : "m" (*lock) : "memory");
152 static inline void arch_read_unlock(arch_rwlock_t * lock)
155 __asm__ __volatile__(
164 : "=m" (*lock), "=&r" (regx)
165 : "m" (*lock) : "memory");
168 static inline void arch_write_unlock(arch_rwlock_t * lock)
174 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
175 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
177 #endif /* _ALPHA_SPINLOCK_H */