#ifndef _ALPHA_ATOMIC_H#define _ALPHA_ATOMIC_H #include <linux/types.h>#include <asm/barrier.h>#include <asm/cmpxchg.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. */  #define ATOMIC_INIT(i)		{ (i) }#define ATOMIC64_INIT(i)	{ (i) } #define atomic_read(v)		(*(volatile int *)&(v)->counter)#define atomic64_read(v)	(*(volatile long *)&(v)->counter) #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 the old value of @v. */static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u){	int c, new, old;	smp_mb();	__asm__ __volatile__(	"1:	ldl_l	%[old],%[mem]\n"	"	cmpeq	%[old],%[u],%[c]\n"	"	addl	%[old],%[a],%[new]\n"	"	bne	%[c],2f\n"	"	stl_c	%[new],%[mem]\n"	"	beq	%[new],3f\n"	"2:\n"	".subsection 2\n"	"3:	br	1b\n"	".previous"	: [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c)	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u)	: "memory");	smp_mb();	return old;}  /** * 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 true iff @v was not @u. */static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u){	long c, tmp;	smp_mb();	__asm__ __volatile__(	"1:	ldq_l	%[tmp],%[mem]\n"	"	cmpeq	%[tmp],%[u],%[c]\n"	"	addq	%[tmp],%[a],%[tmp]\n"	"	bne	%[c],2f\n"	"	stq_c	%[tmp],%[mem]\n"	"	beq	%[tmp],3f\n"	"2:\n"	".subsection 2\n"	"3:	br	1b\n"	".previous"	: [tmp] "=&r"(tmp), [c] "=&r"(c)	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u)	: "memory");	smp_mb();	return !c;} /* * atomic64_dec_if_positive - decrement by 1 if old value positive * @v: pointer of type atomic_t * * The function returns the old value of *v minus 1, even if * the atomic variable, v, was not decremented. */static inline long atomic64_dec_if_positive(atomic64_t *v){	long old, tmp;	smp_mb();	__asm__ __volatile__(	"1:	ldq_l	%[old],%[mem]\n"	"	subq	%[old],1,%[tmp]\n"	"	ble	%[old],2f\n"	"	stq_c	%[tmp],%[mem]\n"	"	beq	%[tmp],3f\n"	"2:\n"	".subsection 2\n"	"3:	br	1b\n"	".previous"	: [old] "=&r"(old), [tmp] "=&r"(tmp)	: [mem] "m"(*v)	: "memory");	smp_mb();	return old - 1;} #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() #endif /* _ALPHA_ATOMIC_H */