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#ifndef _ASM_X86_ATOMIC_32_H

#define _ASM_X86_ATOMIC_32_H

#include 

#include 

//#include 

#include 

/*

 * 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.

 */

static inline int atomic_read(const atomic_t *v)

{

	return v->counter;

}

/**

 * atomic_set - set atomic variable

 * @v: pointer of type atomic_t

 * @i: required value

 *

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

 */

static inline void atomic_set(atomic_t *v, int 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));

}

/**

 * atomic_sub - subtract integer from 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));

}

/**

 * 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) : "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));

}

/**

 * 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));

}

/**

 * 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)

		     : : "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)

		     : : "memory");

	return c != 0;

}

/**

 * atomic_add_negative - add and test if negative

 * @v: pointer of type atomic_t

 * @i: integer value to add

 *

 * 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) : "memory");

	return c;

}

/**

 * atomic_add_return - add integer and return

 * @v: pointer of type atomic_t

 * @i: integer value to add

 *

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

 */

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

{

	int __i;

#ifdef CONFIG_M386

	unsigned long flags;

	if (unlikely(boot_cpu_data.x86 <= 3))

		goto no_xadd;

#endif

	/* Modern 486+ processor */

	__i = i;

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

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

		     : : "memory");

	return i + __i;

#ifdef CONFIG_M386

no_xadd: /* Legacy 386 processor */

	local_irq_save(flags);

	__i = atomic_read(v);

	atomic_set(v, i + __i);

	local_irq_restore(flags);

	return i + __i;

#endif

}

/**

 * atomic_sub_return - subtract integer and return

 * @v: pointer of type atomic_t

 * @i: integer value to subtract

 *

 * Atomically subtracts @i from @v and returns @v - @i

 */

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

{

	return atomic_add_return(-i, v);

}

static inline int atomic_cmpxchg(atomic_t *v, int old, int new)

{

	return cmpxchg(&v->counter, old, new);

}

static inline int atomic_xchg(atomic_t *v, int new)

{

	return xchg(&v->counter, new);

}

/**

 * atomic_add_unless - add unless the number is already 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 @v was not already @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)

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

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

/* 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" (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()

/* An 64bit atomic type */

typedef struct {

	u64 __aligned(8) counter;

} atomic64_t;

extern u64 atomic64_cmpxchg(atomic64_t *ptr, u64 old_val, u64 new_val);

/**

 * atomic64_xchg - xchg atomic64 variable

 * @ptr:      pointer to type atomic64_t

 * @new_val:  value to assign

 *

 * Atomically xchgs the value of @ptr to @new_val 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

 * @ptr:      pointer to type atomic64_t

 * @new_val:  value to assign

 *

 * Atomically sets the value of @ptr to @new_val.

 */

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

{

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

    unsigned low = (unsigned)i;

    asm volatile (

    "1:                 \n\t"

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

    "jnz 1b             \n\t"

    :

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

    : "eax", "edx", "memory", "cc");

}

/**

 * atomic64_read - read atomic64 variable

 * @ptr:      pointer to type atomic64_t

 *

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

 */

static inline u64 atomic64_read(atomic64_t *ptr)

{

	u64 res;

	/*

	 * Note, we inline this atomic64_t primitive because

	 * it only clobbers EAX/EDX and leaves the others

	 * untouched. We also (somewhat subtly) rely on the

	 * fact that cmpxchg8b returns the current 64-bit value

	 * of the memory location we are touching:

	 */

	asm volatile(

		"mov %%ebx, %%eax\n\t"

		"mov %%ecx, %%edx\n\t"

		LOCK_PREFIX "cmpxchg8b %1\n"

			: "=&A" (res)

			: "m" (*ptr)

		);

	return res;

}

/**

 * atomic64_add_return - add and return

 * @delta: integer value to add

 * @ptr:   pointer to type atomic64_t

 *

 * Atomically adds @delta to @ptr and returns @delta + *@ptr

 */

extern u64 atomic64_add_return(u64 delta, atomic64_t *ptr);

/*

 * Other variants with different arithmetic operators:

 */

extern u64 atomic64_sub_return(u64 delta, atomic64_t *ptr);

extern u64 atomic64_inc_return(atomic64_t *ptr);

extern u64 atomic64_dec_return(atomic64_t *ptr);

/**

 * atomic64_add - add integer to atomic64 variable

 * @delta: integer value to add

 * @ptr:   pointer to type atomic64_t

 *

 * Atomically adds @delta to @ptr.

 */

extern void atomic64_add(u64 delta, atomic64_t *ptr);

/**

 * atomic64_sub - subtract the atomic64 variable

 * @delta: integer value to subtract

 * @ptr:   pointer to type atomic64_t

 *

 * Atomically subtracts @delta from @ptr.

 */

extern void atomic64_sub(u64 delta, atomic64_t *ptr);

/**

 * atomic64_sub_and_test - subtract value from variable and test result

 * @delta: integer value to subtract

 * @ptr:   pointer to type atomic64_t

 *

 * Atomically subtracts @delta from @ptr and returns

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

 * other cases.

 */

extern int atomic64_sub_and_test(u64 delta, atomic64_t *ptr);

/**

 * atomic64_inc - increment atomic64 variable

 * @ptr: pointer to type atomic64_t

 *

 * Atomically increments @ptr by 1.

 */

extern void atomic64_inc(atomic64_t *ptr);

/**

 * atomic64_dec - decrement atomic64 variable

 * @ptr: pointer to type atomic64_t

 *

 * Atomically decrements @ptr by 1.

 */

extern void atomic64_dec(atomic64_t *ptr);

/**

 * atomic64_dec_and_test - decrement and test

 * @ptr: pointer to type atomic64_t

 *

 * Atomically decrements @ptr by 1 and

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

 * cases.

 */

extern int atomic64_dec_and_test(atomic64_t *ptr);

/**

 * atomic64_inc_and_test - increment and test

 * @ptr: pointer to type atomic64_t

 *

 * Atomically increments @ptr by 1

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

 * other cases.

 */

extern int atomic64_inc_and_test(atomic64_t *ptr);

/**

 * atomic64_add_negative - add and test if negative

 * @delta: integer value to add

 * @ptr:   pointer to type atomic64_t

 *

 * Atomically adds @delta to @ptr and returns true

 * if the result is negative, or false when

 * result is greater than or equal to zero.

 */

extern int atomic64_add_negative(u64 delta, atomic64_t *ptr);

#include 

#endif /* _ASM_X86_ATOMIC_32_H */