#ifndef _ASM_X86_ATOMIC_64_H

#define _ASM_X86_ATOMIC_64_H

#include <asm/alternative.h>

#include <asm/cmpxchg.h>

/*

 * Atomic operations that C can't guarantee us.  Useful for

 * resource counting etc..

 */

#define ATOMIC_INIT(i)	{ (i) }

/**

 * atomic_read - read atomic variable

 * @v: pointer of type atomic_t

 *

 * Atomically reads the value of @v.

 */

#define atomic_read(v)		((v)->counter)

/**

 * atomic_set - set atomic variable

 * @v: pointer of type atomic_t

 * @i: required value

 *

 * Atomically sets the value of @v to @i.

 */

#define atomic_set(v, i)		(((v)->counter) = (i))

/**

 * atomic_add - add integer to atomic variable

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *

 * Atomically adds @i to @v.

 */

static inline void atomic_add(int i, atomic_t *v)

{

	asm volatile(LOCK_PREFIX "addl %1,%0"

		     : "=m" (v->counter)

		     : "ir" (i), "m" (v->counter));

}

/**

 * atomic_sub - subtract the atomic variable

 * @i: integer value to subtract

 * @v: pointer of type atomic_t

 *

 * Atomically subtracts @i from @v.

 */

static inline void atomic_sub(int i, atomic_t *v)

{

	asm volatile(LOCK_PREFIX "subl %1,%0"

		     : "=m" (v->counter)

		     : "ir" (i), "m" (v->counter));

}

/**

 * atomic_sub_and_test - subtract value from variable and test result

 * @i: integer value to subtract

 * @v: pointer of type atomic_t

 *

 * Atomically subtracts @i from @v and returns

 * true if the result is zero, or false for all

 * other cases.

 */

static inline int atomic_sub_and_test(int i, atomic_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "subl %2,%0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "ir" (i), "m" (v->counter) : "memory");

	return c;

}

/**

 * atomic_inc - increment atomic variable

 * @v: pointer of type atomic_t

 *

 * Atomically increments @v by 1.

 */

static inline void atomic_inc(atomic_t *v)

{

	asm volatile(LOCK_PREFIX "incl %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

}

/**

 * atomic_dec - decrement atomic variable

 * @v: pointer of type atomic_t

 *

 * Atomically decrements @v by 1.

 */

static inline void atomic_dec(atomic_t *v)

{

	asm volatile(LOCK_PREFIX "decl %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

}

/**

 * atomic_dec_and_test - decrement and test

 * @v: pointer of type atomic_t

 *

 * Atomically decrements @v by 1 and

 * returns true if the result is 0, or false for all other

 * cases.

 */

static inline int atomic_dec_and_test(atomic_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "decl %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

	return c != 0;

}

/**

 * atomic_inc_and_test - increment and test

 * @v: pointer of type atomic_t

 *

 * Atomically increments @v by 1

 * and returns true if the result is zero, or false for all

 * other cases.

 */

static inline int atomic_inc_and_test(atomic_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "incl %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

	return c != 0;

}

/**

 * atomic_add_negative - add and test if negative

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *

 * Atomically adds @i to @v and returns true

 * if the result is negative, or false when

 * result is greater than or equal to zero.

 */

static inline int atomic_add_negative(int i, atomic_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "addl %2,%0; sets %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "ir" (i), "m" (v->counter) : "memory");

	return c;

}

/**

 * atomic_add_return - add and return

 * @i: integer value to add

 * @v: pointer of type atomic_t

 *

 * Atomically adds @i to @v and returns @i + @v

 */

static inline int atomic_add_return(int i, atomic_t *v)

{

	int __i = i;

	asm volatile(LOCK_PREFIX "xaddl %0, %1"

		     : "+r" (i), "+m" (v->counter)

		     : : "memory");

	return i + __i;

}

static inline int atomic_sub_return(int i, atomic_t *v)

{

	return atomic_add_return(-i, v);

}

#define atomic_inc_return(v)  (atomic_add_return(1, v))

#define atomic_dec_return(v)  (atomic_sub_return(1, v))

#define ATOMIC64_INIT(i)	{ (i) }

/**

 * atomic64_read - read atomic64 variable

 * @v: pointer of type atomic64_t

 *

 * Atomically reads the value of @v.

 * Doesn't imply a read memory barrier.

 */

#define atomic64_read(v)		((v)->counter)

/**

 * atomic64_set - set atomic64 variable

 * @v: pointer to type atomic64_t

 * @i: required value

 *

 * Atomically sets the value of @v to @i.

 */

#define atomic64_set(v, i)		(((v)->counter) = (i))

/**

 * atomic64_add - add integer to atomic64 variable

 * @i: integer value to add

 * @v: pointer to type atomic64_t

 *

 * Atomically adds @i to @v.

 */

static inline void atomic64_add(long i, atomic64_t *v)

{

	asm volatile(LOCK_PREFIX "addq %1,%0"

		     : "=m" (v->counter)

		     : "er" (i), "m" (v->counter));

}

/**

 * atomic64_sub - subtract the atomic64 variable

 * @i: integer value to subtract

 * @v: pointer to type atomic64_t

 *

 * Atomically subtracts @i from @v.

 */

static inline void atomic64_sub(long i, atomic64_t *v)

{

	asm volatile(LOCK_PREFIX "subq %1,%0"

		     : "=m" (v->counter)

		     : "er" (i), "m" (v->counter));

}

/**

 * atomic64_sub_and_test - subtract value from variable and test result

 * @i: integer value to subtract

 * @v: pointer to type atomic64_t

 *

 * Atomically subtracts @i from @v and returns

 * true if the result is zero, or false for all

 * other cases.

 */

static inline int atomic64_sub_and_test(long i, atomic64_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "subq %2,%0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "er" (i), "m" (v->counter) : "memory");

	return c;

}

/**

 * atomic64_inc - increment atomic64 variable

 * @v: pointer to type atomic64_t

 *

 * Atomically increments @v by 1.

 */

static inline void atomic64_inc(atomic64_t *v)

{

	asm volatile(LOCK_PREFIX "incq %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

}

/**

 * atomic64_dec - decrement atomic64 variable

 * @v: pointer to type atomic64_t

 *

 * Atomically decrements @v by 1.

 */

static inline void atomic64_dec(atomic64_t *v)

{

	asm volatile(LOCK_PREFIX "decq %0"

		     : "=m" (v->counter)

		     : "m" (v->counter));

}

/**

 * atomic64_dec_and_test - decrement and test

 * @v: pointer to type atomic64_t

 *

 * Atomically decrements @v by 1 and

 * returns true if the result is 0, or false for all other

 * cases.

 */

static inline int atomic64_dec_and_test(atomic64_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "decq %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

	return c != 0;

}

/**

 * atomic64_inc_and_test - increment and test

 * @v: pointer to type atomic64_t

 *

 * Atomically increments @v by 1

 * and returns true if the result is zero, or false for all

 * other cases.

 */

static inline int atomic64_inc_and_test(atomic64_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "incq %0; sete %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "m" (v->counter) : "memory");

	return c != 0;

}

/**

 * atomic64_add_negative - add and test if negative

 * @i: integer value to add

 * @v: pointer to type atomic64_t

 *

 * Atomically adds @i to @v and returns true

 * if the result is negative, or false when

 * result is greater than or equal to zero.

 */

static inline int atomic64_add_negative(long i, atomic64_t *v)

{

	unsigned char c;

	asm volatile(LOCK_PREFIX "addq %2,%0; sets %1"

		     : "=m" (v->counter), "=qm" (c)

		     : "er" (i), "m" (v->counter) : "memory");

	return c;

}

/**

 * atomic64_add_return - add and return

 * @i: integer value to add

 * @v: pointer to type atomic64_t

 *

 * Atomically adds @i to @v and returns @i + @v

 */

static inline long atomic64_add_return(long i, atomic64_t *v)

{

	long __i = i;

	asm volatile(LOCK_PREFIX "xaddq %0, %1;"

		     : "+r" (i), "+m" (v->counter)

		     : : "memory");

	return i + __i;

}

static inline long atomic64_sub_return(long i, atomic64_t *v)

{

	return atomic64_add_return(-i, v);

}

#define atomic64_inc_return(v)  (atomic64_add_return(1, (v)))

#define atomic64_dec_return(v)  (atomic64_sub_return(1, (v)))

#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);

}

/**

 * atomic_inc_short - increment of a short integer

 * @v: pointer to type int

 *

 * Atomically adds 1 to @v

 * Returns the new value of @u

 */

static inline short int atomic_inc_short(short int *v)

{

	asm(LOCK_PREFIX "addw $1, %0" : "+m" (*v));

	return *v;

}

/**

 * atomic_or_long - OR of two long integers

 * @v1: pointer to type unsigned long

 * @v2: pointer to type unsigned long

 *

 * Atomically ORs @v1 and @v2

 * Returns the result of the OR

 */

static inline void atomic_or_long(unsigned long *v1, unsigned long v2)

{

	asm(LOCK_PREFIX "orq %1, %0" : "+m" (*v1) : "r" (v2));

}

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

/* These are x86-specific, used by some header files */

#define atomic_clear_mask(mask, addr)					\

	asm volatile(LOCK_PREFIX "andl %0,%1"				\

		     : : "r" (~(mask)), "m" (*(addr)) : "memory")

#define atomic_set_mask(mask, addr)					\

	asm volatile(LOCK_PREFIX "orl %0,%1"				\

		     : : "r" ((unsigned)(mask)), "m" (*(addr))		\

		     : "memory")

/* Atomic operations are already serializing on x86 */

#define smp_mb__before_atomic_dec()	barrier()

#define smp_mb__after_atomic_dec()	barrier()

#define smp_mb__before_atomic_inc()	barrier()

#define smp_mb__after_atomic_inc()	barrier()

#include <asm-generic/atomic.h>

#endif /* _ASM_X86_ATOMIC_64_H */