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#ifndef _ASM_X86_ATOMIC64_32_H

#define _ASM_X86_ATOMIC64_32_H

#include 

#include 

#include 

#include 

/* An 64bit atomic type */

typedef struct {

	u64 __aligned(8) counter;

} atomic64_t;

#define ATOMIC64_INIT(val)	{ (val) }

#define __ATOMIC64_DECL(sym) void atomic64_##sym(atomic64_t *, ...)

#ifndef ATOMIC64_EXPORT

#define ATOMIC64_DECL_ONE __ATOMIC64_DECL

#else

#define ATOMIC64_DECL_ONE(sym) __ATOMIC64_DECL(sym); \

	ATOMIC64_EXPORT(atomic64_##sym)

#endif

#ifdef CONFIG_X86_CMPXCHG64

#define __alternative_atomic64(f, g, out, in...) \

	asm volatile("call %P[func]" \

		     : out : [func] "i" (atomic64_##g##_cx8), ## in)

#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8)

#else

#define __alternative_atomic64(f, g, out, in...) \

	alternative_call(atomic64_##f##_386, atomic64_##g##_cx8, \

			 X86_FEATURE_CX8, ASM_OUTPUT2(out), ## in)

#define ATOMIC64_DECL(sym) ATOMIC64_DECL_ONE(sym##_cx8); \

	ATOMIC64_DECL_ONE(sym##_386)

ATOMIC64_DECL_ONE(add_386);

ATOMIC64_DECL_ONE(sub_386);

ATOMIC64_DECL_ONE(inc_386);

ATOMIC64_DECL_ONE(dec_386);

#endif

#define alternative_atomic64(f, out, in...) \

	__alternative_atomic64(f, f, ASM_OUTPUT2(out), ## in)

ATOMIC64_DECL(read);

ATOMIC64_DECL(set);

ATOMIC64_DECL(xchg);

ATOMIC64_DECL(add_return);

ATOMIC64_DECL(sub_return);

ATOMIC64_DECL(inc_return);

ATOMIC64_DECL(dec_return);

ATOMIC64_DECL(dec_if_positive);

ATOMIC64_DECL(inc_not_zero);

ATOMIC64_DECL(add_unless);

#undef ATOMIC64_DECL

#undef ATOMIC64_DECL_ONE

#undef __ATOMIC64_DECL

#undef ATOMIC64_EXPORT

/**

 * atomic64_cmpxchg - cmpxchg atomic64 variable

 * @v: pointer to type atomic64_t

 * @o: expected value

 * @n: new value

 *

 * Atomically sets @v to @n if it was equal to @o and returns

 * the old value.

 */

static inline long long atomic64_cmpxchg(atomic64_t *v, long long o, long long n)

{

	return cmpxchg64(&v->counter, o, n);

}

/**

 * atomic64_xchg - xchg atomic64 variable

 * @v: pointer to type atomic64_t

 * @n: value to assign

 *

 * Atomically xchgs the value of @v to @n and returns

 * the old value.

 */

static inline long long atomic64_xchg(atomic64_t *v, long long n)

{

    long long o;

    unsigned high = (unsigned)(n >> 32);

    unsigned low = (unsigned)n;

    asm volatile(

    "1:                 \n\t"

    "cmpxchg8b (%%esi)  \n\t"

    "jnz 1b             \n\t"

    :"=&A" (o)

    :"S" (v), "b" (low), "c" (high)

    : "memory", "cc");

    return o;

}

/**

 * atomic64_set - set atomic64 variable

 * @v: pointer to type atomic64_t

 * @i: value to assign

 *

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

 */

static inline void atomic64_set(atomic64_t *v, long long i)

{

    __sync_lock_test_and_set((long long *)&v->counter, i);

}

/**

 * atomic64_read - read atomic64 variable

 * @v: pointer to type atomic64_t

 *

 * Atomically reads the value of @v and returns it.

 */

static inline long long atomic64_read(const atomic64_t *v)

{

    return __sync_fetch_and_add( (long long *)&v->counter, 0);

}

/**

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

{

	alternative_atomic64(add_return,

			     ASM_OUTPUT2("+A" (i), "+c" (v)),

			     ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}

/*

 * Other variants with different arithmetic operators:

 */

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

{

	alternative_atomic64(sub_return,

			     ASM_OUTPUT2("+A" (i), "+c" (v)),

			     ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}

static inline long long atomic64_inc_return(atomic64_t *v)

{

	long long a;

	alternative_atomic64(inc_return, "=&A" (a),

			     "S" (v) : "memory", "ecx");

	return a;

}

static inline long long atomic64_dec_return(atomic64_t *v)

{

	long long a;

	alternative_atomic64(dec_return, "=&A" (a),

			     "S" (v) : "memory", "ecx");

	return a;

}

/**

 * 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 long long atomic64_add(long long i, atomic64_t *v)

{

	__alternative_atomic64(add, add_return,

			       ASM_OUTPUT2("+A" (i), "+c" (v)),

			       ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}

/**

 * atomic64_sub - subtract the atomic64 variable

 * @i: integer value to subtract

 * @v: pointer to type atomic64_t

 *

 * Atomically subtracts @i from @v.

 */

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

{

	__alternative_atomic64(sub, sub_return,

			       ASM_OUTPUT2("+A" (i), "+c" (v)),

			       ASM_NO_INPUT_CLOBBER("memory"));

	return i;

}

/**

 * 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 long i, atomic64_t *v)

{

	return atomic64_sub_return(i, v) == 0;

}

/**

 * atomic64_inc - increment atomic64 variable

 * @v: pointer to type atomic64_t

 *

 * Atomically increments @v by 1.

 */

static inline void atomic64_inc(atomic64_t *v)

{

	__alternative_atomic64(inc, inc_return, /* no output */,

			       "S" (v) : "memory", "eax", "ecx", "edx");

}

/**

 * atomic64_dec - decrement atomic64 variable

 * @v: pointer to type atomic64_t

 *

 * Atomically decrements @v by 1.

 */

static inline void atomic64_dec(atomic64_t *v)

{

	__alternative_atomic64(dec, dec_return, /* no output */,

			       "S" (v) : "memory", "eax", "ecx", "edx");

}

/**

 * 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)

{

	return atomic64_dec_return(v) == 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)

{

	return atomic64_inc_return(v) == 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 long i, atomic64_t *v)

{

	return atomic64_add_return(i, v) < 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 the add was done, zero otherwise.

 */

static inline int atomic64_add_unless(atomic64_t *v, long long a, long long u)

{

	unsigned low = (unsigned)u;

	unsigned high = (unsigned)(u >> 32);

	alternative_atomic64(add_unless,

			     ASM_OUTPUT2("+A" (a), "+c" (low), "+D" (high)),

			     "S" (v) : "memory");

	return (int)a;

}

static inline int atomic64_inc_not_zero(atomic64_t *v)

{

	int r;

	alternative_atomic64(inc_not_zero, "=&a" (r),

			     "S" (v) : "ecx", "edx", "memory");

	return r;

}

static inline long long atomic64_dec_if_positive(atomic64_t *v)

{

	long long r;

	alternative_atomic64(dec_if_positive, "=&A" (r),

			     "S" (v) : "ecx", "memory");

	return r;

}

#undef alternative_atomic64

#undef __alternative_atomic64

#define ATOMIC64_OP(op, c_op)						\

static inline void atomic64_##op(long long i, atomic64_t *v)		\

{									\

	long long old, c = 0;						\

	while ((old = atomic64_cmpxchg(v, c, c c_op i)) != c)		\

		c = old;						\

}

ATOMIC64_OP(and, &)

ATOMIC64_OP(or, |)

ATOMIC64_OP(xor, ^)

#undef ATOMIC64_OP

#endif /* _ASM_X86_ATOMIC64_32_H */