#ifndef _ALPHA_SPINLOCK_H #define _ALPHA_SPINLOCK_H #include <linux/config.h> #include <asm/system.h> #include <linux/kernel.h> #include <asm/current.h> /* * Simple spin lock operations. There are two variants, one clears IRQ's * on the local processor, one does not. * * We make no fairness assumptions. They have a cost. */ #define __raw_spin_lock_flags(lock, flags) __raw_spin_lock(lock) #define __raw_spin_is_locked(x) ((x)->lock != 0) #define __raw_spin_unlock_wait(x) \ do { cpu_relax(); } while ((x)->lock) static inline void __raw_spin_unlock(raw_spinlock_t * lock) { mb(); lock->lock = 0; } static inline void __raw_spin_lock(raw_spinlock_t * lock) { long tmp; __asm__ __volatile__( "1: ldl_l %0,%1\n" " bne %0,2f\n" " lda %0,1\n" " stl_c %0,%1\n" " beq %0,2f\n" " mb\n" ".subsection 2\n" "2: ldl %0,%1\n" " bne %0,2b\n" " br 1b\n" ".previous" : "=&r" (tmp), "=m" (lock->lock) : "m"(lock->lock) : "memory"); } static inline int __raw_spin_trylock(raw_spinlock_t *lock) { return !test_and_set_bit(0, &lock->lock); } /***********************************************************/ static inline int __raw_read_can_lock(raw_rwlock_t *lock) { return (lock->lock & 1) == 0; } static inline int __raw_write_can_lock(raw_rwlock_t *lock) { return lock->lock == 0; } static inline void __raw_read_lock(raw_rwlock_t *lock) { long regx; __asm__ __volatile__( "1: ldl_l %1,%0\n" " blbs %1,6f\n" " subl %1,2,%1\n" " stl_c %1,%0\n" " beq %1,6f\n" " mb\n" ".subsection 2\n" "6: ldl %1,%0\n" " blbs %1,6b\n" " br 1b\n" ".previous" : "=m" (*lock), "=&r" (regx) : "m" (*lock) : "memory"); } static inline void __raw_write_lock(raw_rwlock_t *lock) { long regx; __asm__ __volatile__( "1: ldl_l %1,%0\n" " bne %1,6f\n" " lda %1,1\n" " stl_c %1,%0\n" " beq %1,6f\n" " mb\n" ".subsection 2\n" "6: ldl %1,%0\n" " bne %1,6b\n" " br 1b\n" ".previous" : "=m" (*lock), "=&r" (regx) : "m" (*lock) : "memory"); } static inline int __raw_read_trylock(raw_rwlock_t * lock) { long regx; int success; __asm__ __volatile__( "1: ldl_l %1,%0\n" " lda %2,0\n" " blbs %1,2f\n" " subl %1,2,%2\n" " stl_c %2,%0\n" " beq %2,6f\n" "2: mb\n" ".subsection 2\n" "6: br 1b\n" ".previous" : "=m" (*lock), "=&r" (regx), "=&r" (success) : "m" (*lock) : "memory"); return success; } static inline int __raw_write_trylock(raw_rwlock_t * lock) { long regx; int success; __asm__ __volatile__( "1: ldl_l %1,%0\n" " lda %2,0\n" " bne %1,2f\n" " lda %2,1\n" " stl_c %2,%0\n" " beq %2,6f\n" "2: mb\n" ".subsection 2\n" "6: br 1b\n" ".previous" : "=m" (*lock), "=&r" (regx), "=&r" (success) : "m" (*lock) : "memory"); return success; } static inline void __raw_read_unlock(raw_rwlock_t * lock) { long regx; __asm__ __volatile__( " mb\n" "1: ldl_l %1,%0\n" " addl %1,2,%1\n" " stl_c %1,%0\n" " beq %1,6f\n" ".subsection 2\n" "6: br 1b\n" ".previous" : "=m" (*lock), "=&r" (regx) : "m" (*lock) : "memory"); } static inline void __raw_write_unlock(raw_rwlock_t * lock) { mb(); lock->lock = 0; } #endif /* _ALPHA_SPINLOCK_H */