[linux-2.6-block.git] / include / asm-x86 / atomic_64.h

#ifndef __ARCH_X86_64_ATOMIC__
#define __ARCH_X86_64_ATOMIC__

#include <asm/alternative.h>
#include <asm/cmpxchg.h>

/* atomic_t should be 32 bit signed type */

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

#ifdef CONFIG_SMP
#define LOCK "lock ; "
#else
#define LOCK ""
#endif

/*
 * 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 { int counter; } atomic_t;

#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))

/* An 64bit atomic type */

typedef struct { long counter; } atomic64_t;

#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)
		:"ir" (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)
		:"ir" (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)
		:"ir" (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)
		:"ir" (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);
}

#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
Commit	Line	Data
1da177e4 LT	1	#ifndef __ARCH_X86_64_ATOMIC__
	2	#define __ARCH_X86_64_ATOMIC__
	3
d167a518	4	#include <asm/alternative.h>
a436ed9c	5	#include <asm/cmpxchg.h>
1da177e4 LT	6
	7	/* atomic_t should be 32 bit signed type */
	8
	9	/*
	10	* Atomic operations that C can't guarantee us. Useful for
	11	* resource counting etc..
	12	*/
	13
	14	#ifdef CONFIG_SMP
	15	#define LOCK "lock ; "
	16	#else
	17	#define LOCK ""
	18	#endif
	19
	20	/*
	21	* Make sure gcc doesn't try to be clever and move things around
	22	* on us. We need to use _exactly_ the address the user gave us,
	23	* not some alias that contains the same information.
	24	*/
f9e9dcb3	25	typedef struct { int counter; } atomic_t;
1da177e4 LT	26
	27	#define ATOMIC_INIT(i) { (i) }
	28
	29	/**
	30	* atomic_read - read atomic variable
	31	* @v: pointer of type atomic_t
	32	*
	33	* Atomically reads the value of @v.
	34	*/
	35	#define atomic_read(v) ((v)->counter)
	36
	37	/**
	38	* atomic_set - set atomic variable
	39	* @v: pointer of type atomic_t
	40	* @i: required value
	41	*
	42	* Atomically sets the value of @v to @i.
	43	*/
	44	#define atomic_set(v,i) (((v)->counter) = (i))
	45
	46	/**
	47	* atomic_add - add integer to atomic variable
	48	* @i: integer value to add
	49	* @v: pointer of type atomic_t
	50	*
	51	* Atomically adds @i to @v.
	52	*/
	53	static __inline__ void atomic_add(int i, atomic_t *v)
	54	{
	55	__asm__ __volatile__(
d167a518	56	LOCK_PREFIX "addl %1,%0"
1da177e4 LT	57	:"=m" (v->counter)
	58	:"ir" (i), "m" (v->counter));
	59	}
	60
	61	/**
	62	* atomic_sub - subtract the atomic variable
	63	* @i: integer value to subtract
	64	* @v: pointer of type atomic_t
	65	*
	66	* Atomically subtracts @i from @v.
	67	*/
	68	static __inline__ void atomic_sub(int i, atomic_t *v)
	69	{
	70	__asm__ __volatile__(
d167a518	71	LOCK_PREFIX "subl %1,%0"
1da177e4 LT	72	:"=m" (v->counter)
	73	:"ir" (i), "m" (v->counter));
	74	}
	75
	76	/**
	77	* atomic_sub_and_test - subtract value from variable and test result
	78	* @i: integer value to subtract
	79	* @v: pointer of type atomic_t
	80	*
	81	* Atomically subtracts @i from @v and returns
	82	* true if the result is zero, or false for all
	83	* other cases.
	84	*/
	85	static __inline__ int atomic_sub_and_test(int i, atomic_t *v)
	86	{
	87	unsigned char c;
	88
	89	__asm__ __volatile__(
d167a518	90	LOCK_PREFIX "subl %2,%0; sete %1"
1da177e4 LT	91	:"=m" (v->counter), "=qm" (c)
	92	:"ir" (i), "m" (v->counter) : "memory");
	93	return c;
	94	}
	95
	96	/**
	97	* atomic_inc - increment atomic variable
	98	* @v: pointer of type atomic_t
	99	*
	100	* Atomically increments @v by 1.
	101	*/
	102	static __inline__ void atomic_inc(atomic_t *v)
	103	{
	104	__asm__ __volatile__(
d167a518	105	LOCK_PREFIX "incl %0"
1da177e4 LT	106	:"=m" (v->counter)
	107	:"m" (v->counter));
	108	}
	109
	110	/**
	111	* atomic_dec - decrement atomic variable
	112	* @v: pointer of type atomic_t
	113	*
	114	* Atomically decrements @v by 1.
	115	*/
	116	static __inline__ void atomic_dec(atomic_t *v)
	117	{
	118	__asm__ __volatile__(
d167a518	119	LOCK_PREFIX "decl %0"
1da177e4 LT	120	:"=m" (v->counter)
	121	:"m" (v->counter));
	122	}
	123
	124	/**
	125	* atomic_dec_and_test - decrement and test
	126	* @v: pointer of type atomic_t
	127	*
	128	* Atomically decrements @v by 1 and
	129	* returns true if the result is 0, or false for all other
	130	* cases.
	131	*/
	132	static __inline__ int atomic_dec_and_test(atomic_t *v)
	133	{
	134	unsigned char c;
	135
	136	__asm__ __volatile__(
d167a518	137	LOCK_PREFIX "decl %0; sete %1"
1da177e4 LT	138	:"=m" (v->counter), "=qm" (c)
	139	:"m" (v->counter) : "memory");
	140	return c != 0;
	141	}
	142
	143	/**
	144	* atomic_inc_and_test - increment and test
	145	* @v: pointer of type atomic_t
	146	*
	147	* Atomically increments @v by 1
	148	* and returns true if the result is zero, or false for all
	149	* other cases.
	150	*/
	151	static __inline__ int atomic_inc_and_test(atomic_t *v)
	152	{
	153	unsigned char c;
	154
	155	__asm__ __volatile__(
d167a518	156	LOCK_PREFIX "incl %0; sete %1"
1da177e4 LT	157	:"=m" (v->counter), "=qm" (c)
	158	:"m" (v->counter) : "memory");
	159	return c != 0;
	160	}
	161
	162	/**
	163	* atomic_add_negative - add and test if negative
1da177e4	164	* @i: integer value to add
7c72aaf2	165	* @v: pointer of type atomic_t
1da177e4 LT	166	*
	167	* Atomically adds @i to @v and returns true
	168	* if the result is negative, or false when
	169	* result is greater than or equal to zero.
	170	*/
	171	static __inline__ int atomic_add_negative(int i, atomic_t *v)
	172	{
	173	unsigned char c;
	174
	175	__asm__ __volatile__(
d167a518	176	LOCK_PREFIX "addl %2,%0; sets %1"
1da177e4 LT	177	:"=m" (v->counter), "=qm" (c)
	178	:"ir" (i), "m" (v->counter) : "memory");
	179	return c;
	180	}
	181
7c72aaf2 HD	182	/**
	183	* atomic_add_return - add and return
	184	* @i: integer value to add
	185	* @v: pointer of type atomic_t
	186	*
	187	* Atomically adds @i to @v and returns @i + @v
	188	*/
	189	static __inline__ int atomic_add_return(int i, atomic_t *v)
	190	{
	191	int __i = i;
	192	__asm__ __volatile__(
9dc452ba AK	193	LOCK_PREFIX "xaddl %0, %1"
	194	:"+r" (i), "+m" (v->counter)
	195	: : "memory");
7c72aaf2 HD	196	return i + __i;
	197	}
	198
	199	static __inline__ int atomic_sub_return(int i, atomic_t *v)
	200	{
	201	return atomic_add_return(-i,v);
	202	}
	203
	204	#define atomic_inc_return(v) (atomic_add_return(1,v))
	205	#define atomic_dec_return(v) (atomic_sub_return(1,v))
	206
1da177e4 LT	207	/* An 64bit atomic type */
1da177e4 LT	208
883001f9	209	typedef struct { long counter; } atomic64_t;
1da177e4 LT	210
	211	#define ATOMIC64_INIT(i) { (i) }
	212
	213	/**
	214	* atomic64_read - read atomic64 variable
	215	* @v: pointer of type atomic64_t
	216	*
	217	* Atomically reads the value of @v.
	218	* Doesn't imply a read memory barrier.
	219	*/
	220	#define atomic64_read(v) ((v)->counter)
	221
	222	/**
	223	* atomic64_set - set atomic64 variable
	224	* @v: pointer to type atomic64_t
	225	* @i: required value
	226	*
	227	* Atomically sets the value of @v to @i.
	228	*/
	229	#define atomic64_set(v,i) (((v)->counter) = (i))
	230
	231	/**
	232	* atomic64_add - add integer to atomic64 variable
	233	* @i: integer value to add
	234	* @v: pointer to type atomic64_t
	235	*
	236	* Atomically adds @i to @v.
	237	*/
	238	static __inline__ void atomic64_add(long i, atomic64_t *v)
	239	{
	240	__asm__ __volatile__(
d167a518	241	LOCK_PREFIX "addq %1,%0"
1da177e4 LT	242	:"=m" (v->counter)
	243	:"ir" (i), "m" (v->counter));
	244	}
	245
	246	/**
	247	* atomic64_sub - subtract the atomic64 variable
	248	* @i: integer value to subtract
	249	* @v: pointer to type atomic64_t
	250	*
	251	* Atomically subtracts @i from @v.
	252	*/
	253	static __inline__ void atomic64_sub(long i, atomic64_t *v)
	254	{
	255	__asm__ __volatile__(
d167a518	256	LOCK_PREFIX "subq %1,%0"
1da177e4 LT	257	:"=m" (v->counter)
	258	:"ir" (i), "m" (v->counter));
	259	}
	260
	261	/**
	262	* atomic64_sub_and_test - subtract value from variable and test result
	263	* @i: integer value to subtract
	264	* @v: pointer to type atomic64_t
	265	*
	266	* Atomically subtracts @i from @v and returns
	267	* true if the result is zero, or false for all
	268	* other cases.
	269	*/
	270	static __inline__ int atomic64_sub_and_test(long i, atomic64_t *v)
	271	{
	272	unsigned char c;
	273
	274	__asm__ __volatile__(
d167a518	275	LOCK_PREFIX "subq %2,%0; sete %1"
1da177e4 LT	276	:"=m" (v->counter), "=qm" (c)
	277	:"ir" (i), "m" (v->counter) : "memory");
	278	return c;
	279	}
	280
	281	/**
	282	* atomic64_inc - increment atomic64 variable
	283	* @v: pointer to type atomic64_t
	284	*
	285	* Atomically increments @v by 1.
	286	*/
	287	static __inline__ void atomic64_inc(atomic64_t *v)
	288	{
	289	__asm__ __volatile__(
d167a518	290	LOCK_PREFIX "incq %0"
1da177e4 LT	291	:"=m" (v->counter)
	292	:"m" (v->counter));
	293	}
	294
	295	/**
	296	* atomic64_dec - decrement atomic64 variable
	297	* @v: pointer to type atomic64_t
	298	*
	299	* Atomically decrements @v by 1.
	300	*/
	301	static __inline__ void atomic64_dec(atomic64_t *v)
	302	{
	303	__asm__ __volatile__(
d167a518	304	LOCK_PREFIX "decq %0"
1da177e4 LT	305	:"=m" (v->counter)
	306	:"m" (v->counter));
	307	}
	308
	309	/**
	310	* atomic64_dec_and_test - decrement and test
	311	* @v: pointer to type atomic64_t
	312	*
	313	* Atomically decrements @v by 1 and
	314	* returns true if the result is 0, or false for all other
	315	* cases.
	316	*/
	317	static __inline__ int atomic64_dec_and_test(atomic64_t *v)
	318	{
	319	unsigned char c;
	320
	321	__asm__ __volatile__(
d167a518	322	LOCK_PREFIX "decq %0; sete %1"
1da177e4 LT	323	:"=m" (v->counter), "=qm" (c)
	324	:"m" (v->counter) : "memory");
	325	return c != 0;
	326	}
	327
	328	/**
	329	* atomic64_inc_and_test - increment and test
	330	* @v: pointer to type atomic64_t
	331	*
	332	* Atomically increments @v by 1
	333	* and returns true if the result is zero, or false for all
	334	* other cases.
	335	*/
	336	static __inline__ int atomic64_inc_and_test(atomic64_t *v)
	337	{
	338	unsigned char c;
	339
	340	__asm__ __volatile__(
d167a518	341	LOCK_PREFIX "incq %0; sete %1"
1da177e4 LT	342	:"=m" (v->counter), "=qm" (c)
	343	:"m" (v->counter) : "memory");
	344	return c != 0;
	345	}
	346
	347	/**
	348	* atomic64_add_negative - add and test if negative
1da177e4	349	* @i: integer value to add
7c72aaf2	350	* @v: pointer to type atomic64_t
1da177e4 LT	351	*
	352	* Atomically adds @i to @v and returns true
	353	* if the result is negative, or false when
	354	* result is greater than or equal to zero.
	355	*/
7c72aaf2	356	static __inline__ int atomic64_add_negative(long i, atomic64_t *v)
1da177e4 LT	357	{
	358	unsigned char c;
	359
	360	__asm__ __volatile__(
d167a518	361	LOCK_PREFIX "addq %2,%0; sets %1"
1da177e4 LT	362	:"=m" (v->counter), "=qm" (c)
	363	:"ir" (i), "m" (v->counter) : "memory");
	364	return c;
	365	}
	366
	367	/**
7c72aaf2	368	* atomic64_add_return - add and return
1da177e4	369	* @i: integer value to add
7c72aaf2	370	* @v: pointer to type atomic64_t
1da177e4 LT	371	*
	372	* Atomically adds @i to @v and returns @i + @v
	373	*/
7c72aaf2	374	static __inline__ long atomic64_add_return(long i, atomic64_t *v)
1da177e4	375	{
7c72aaf2	376	long __i = i;
1da177e4	377	__asm__ __volatile__(
d167a518	378	LOCK_PREFIX "xaddq %0, %1;"
79d365a3 MD	379	:"+r" (i), "+m" (v->counter)
79d365a3 MD	380	: : "memory");
1da177e4 LT	381	return i + __i;
	382	}
	383
7c72aaf2	384	static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
1da177e4	385	{
7c72aaf2	386	return atomic64_add_return(-i,v);
1da177e4 LT	387	}
1da177e4 LT	388
7c72aaf2 HD	389	#define atomic64_inc_return(v) (atomic64_add_return(1,v))
	390	#define atomic64_dec_return(v) (atomic64_sub_return(1,v))
	391
79d365a3 MD	392	#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
	393	#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
	394
	395	#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
ffbf670f	396	#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
4a6dae6d	397
8426e1f6 NP	398	/**
	399	* atomic_add_unless - add unless the number is a given value
	400	* @v: pointer of type atomic_t
	401	* @a: the amount to add to v...
	402	* @u: ...unless v is equal to u.
	403	*
	404	* Atomically adds @a to @v, so long as it was not @u.
	405	* Returns non-zero if @v was not @u, and zero otherwise.
	406	*/
2856f5e3 MD	407	static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
	408	{
	409	int c, old;
	410	c = atomic_read(v);
	411	for (;;) {
	412	if (unlikely(c == (u)))
	413	break;
	414	old = atomic_cmpxchg((v), c, c + (a));
	415	if (likely(old == c))
	416	break;
	417	c = old;
	418	}
	419	return c != (u);
	420	}
	421
8426e1f6 NP	422	#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
8426e1f6 NP	423
79d365a3 MD	424	/**
	425	* atomic64_add_unless - add unless the number is a given value
	426	* @v: pointer of type atomic64_t
	427	* @a: the amount to add to v...
	428	* @u: ...unless v is equal to u.
	429	*
	430	* Atomically adds @a to @v, so long as it was not @u.
	431	* Returns non-zero if @v was not @u, and zero otherwise.
	432	*/
2856f5e3 MD	433	static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
	434	{
	435	long c, old;
	436	c = atomic64_read(v);
	437	for (;;) {
	438	if (unlikely(c == (u)))
	439	break;
	440	old = atomic64_cmpxchg((v), c, c + (a));
	441	if (likely(old == c))
	442	break;
	443	c = old;
	444	}
	445	return c != (u);
	446	}
	447
79d365a3 MD	448	#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
79d365a3 MD	449
1da177e4 LT	450	/* These are x86-specific, used by some header files */
1da177e4 LT	451	#define atomic_clear_mask(mask, addr) \
d167a518	452	__asm__ __volatile__(LOCK_PREFIX "andl %0,%1" \
1da177e4 LT	453	: : "r" (~(mask)),"m" (*addr) : "memory")
	454
	455	#define atomic_set_mask(mask, addr) \
d167a518	456	__asm__ __volatile__(LOCK_PREFIX "orl %0,%1" \
1da177e4 LT	457	: : "r" ((unsigned)mask),"m" (*(addr)) : "memory")
	458
	459	/* Atomic operations are already serializing on x86 */
	460	#define smp_mb__before_atomic_dec() barrier()
	461	#define smp_mb__after_atomic_dec() barrier()
	462	#define smp_mb__before_atomic_inc() barrier()
	463	#define smp_mb__after_atomic_inc() barrier()
	464
d3cb4871	465	#include <asm-generic/atomic.h>
1da177e4	466	#endif