#ifndef _ALPHA_SPINLOCK_H#define _ALPHA_SPINLOCK_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;} #define _raw_spin_relax(lock)	cpu_relax()#define _raw_read_relax(lock)	cpu_relax()#define _raw_write_relax(lock)	cpu_relax() #endif /* _ALPHA_SPINLOCK_H */