#ifndef _ALPHA_ATOMIC_H#define _ALPHA_ATOMIC_H #include <asm/barrier.h>#include <asm/system.h> /* * Atomic operations that C can't guarantee us.  Useful for * resource counting etc... * * But use these as seldom as possible since they are much slower * than regular operations. */  /* * Counter is volatile to make sure gcc doesn't try to be clever * and move things around on us. We need to use _exactly_ the address * the user gave us, not some alias that contains the same information. */typedef struct { volatile int counter; } atomic_t;typedef struct { volatile long counter; } atomic64_t; #define ATOMIC_INIT(i)		( (atomic_t) { (i) } )#define ATOMIC64_INIT(i)	( (atomic64_t) { (i) } ) #define atomic_read(v)		((v)->counter + 0)#define atomic64_read(v)	((v)->counter + 0) #define atomic_set(v,i)		((v)->counter = (i))#define atomic64_set(v,i)	((v)->counter = (i)) /* * To get proper branch prediction for the main line, we must branch * forward to code at the end of this object's .text section, then * branch back to restart the operation. */ static __inline__ void atomic_add(int i, atomic_t * v){	unsigned long temp;	__asm__ __volatile__(	"1:	ldl_l %0,%1\n"	"	addl %0,%2,%0\n"	"	stl_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter)	:"Ir" (i), "m" (v->counter));} static __inline__ void atomic64_add(long i, atomic64_t * v){	unsigned long temp;	__asm__ __volatile__(	"1:	ldq_l %0,%1\n"	"	addq %0,%2,%0\n"	"	stq_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter)	:"Ir" (i), "m" (v->counter));} static __inline__ void atomic_sub(int i, atomic_t * v){	unsigned long temp;	__asm__ __volatile__(	"1:	ldl_l %0,%1\n"	"	subl %0,%2,%0\n"	"	stl_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter)	:"Ir" (i), "m" (v->counter));} static __inline__ void atomic64_sub(long i, atomic64_t * v){	unsigned long temp;	__asm__ __volatile__(	"1:	ldq_l %0,%1\n"	"	subq %0,%2,%0\n"	"	stq_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter)	:"Ir" (i), "m" (v->counter));}  /* * Same as above, but return the result value */static inline int atomic_add_return(int i, atomic_t *v){	long temp, result;	smp_mb();	__asm__ __volatile__(	"1:	ldl_l %0,%1\n"	"	addl %0,%3,%2\n"	"	addl %0,%3,%0\n"	"	stl_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter), "=&r" (result)	:"Ir" (i), "m" (v->counter) : "memory");	smp_mb();	return result;} static __inline__ long atomic64_add_return(long i, atomic64_t * v){	long temp, result;	smp_mb();	__asm__ __volatile__(	"1:	ldq_l %0,%1\n"	"	addq %0,%3,%2\n"	"	addq %0,%3,%0\n"	"	stq_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter), "=&r" (result)	:"Ir" (i), "m" (v->counter) : "memory");	smp_mb();	return result;} static __inline__ long atomic_sub_return(int i, atomic_t * v){	long temp, result;	smp_mb();	__asm__ __volatile__(	"1:	ldl_l %0,%1\n"	"	subl %0,%3,%2\n"	"	subl %0,%3,%0\n"	"	stl_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter), "=&r" (result)	:"Ir" (i), "m" (v->counter) : "memory");	smp_mb();	return result;} static __inline__ long atomic64_sub_return(long i, atomic64_t * v){	long temp, result;	smp_mb();	__asm__ __volatile__(	"1:	ldq_l %0,%1\n"	"	subq %0,%3,%2\n"	"	subq %0,%3,%0\n"	"	stq_c %0,%1\n"	"	beq %0,2f\n"	".subsection 2\n"	"2:	br 1b\n"	".previous"	:"=&r" (temp), "=m" (v->counter), "=&r" (result)	:"Ir" (i), "m" (v->counter) : "memory");	smp_mb();	return result;} #define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))#define atomic64_xchg(v, new) (xchg(&((v)->counter), new)) #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))#define atomic_xchg(v, new) (xchg(&((v)->counter), new)) /** * atomic_add_unless - add unless the number is a given value * @v: pointer of type atomic_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns non-zero if @v was not @u, and zero otherwise. */static __inline__ int atomic_add_unless(atomic_t *v, int a, int u){	int c, old;	c = atomic_read(v);	for (;;) {		if (unlikely(c == (u)))			break;		old = atomic_cmpxchg((v), c, c + (a));		if (likely(old == c))			break;		c = old;	}	return c != (u);} #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0) /** * atomic64_add_unless - add unless the number is a given value * @v: pointer of type atomic64_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns non-zero if @v was not @u, and zero otherwise. */static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u){	long c, old;	c = atomic64_read(v);	for (;;) {		if (unlikely(c == (u)))			break;		old = atomic64_cmpxchg((v), c, c + (a));		if (likely(old == c))			break;		c = old;	}	return c != (u);} #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0) #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0) #define atomic_dec_return(v) atomic_sub_return(1,(v))#define atomic64_dec_return(v) atomic64_sub_return(1,(v)) #define atomic_inc_return(v) atomic_add_return(1,(v))#define atomic64_inc_return(v) atomic64_add_return(1,(v)) #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0) #define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0) #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0) #define atomic_inc(v) atomic_add(1,(v))#define atomic64_inc(v) atomic64_add(1,(v)) #define atomic_dec(v) atomic_sub(1,(v))#define atomic64_dec(v) atomic64_sub(1,(v)) #define smp_mb__before_atomic_dec()	smp_mb()#define smp_mb__after_atomic_dec()	smp_mb()#define smp_mb__before_atomic_inc()	smp_mb()#define smp_mb__after_atomic_inc()	smp_mb() #include <asm-generic/atomic.h>#endif /* _ALPHA_ATOMIC_H */