powerpc: implement atomic64_t on ppc64

#define smp_mb__before_atomic_inc()     smp_mb()

#define smp_mb__after_atomic_inc()      smp_mb()

#ifdef __powerpc64__

typedef struct { volatile long counter; } atomic64_t;

#define ATOMIC64_INIT(i)	{ (i) }

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

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

static __inline__ void atomic64_add(long a, atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

"1:	ldarx	%0,0,%3		# atomic64_add\n\

	add	%0,%2,%0\n\

	stdcx.	%0,0,%3 \n\

	bne-	1b"

	: "=&r" (t), "=m" (v->counter)

	: "r" (a), "r" (&v->counter), "m" (v->counter)

	: "cc");

}

static __inline__ long atomic64_add_return(long a, atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

	EIEIO_ON_SMP

"1:	ldarx	%0,0,%2		# atomic64_add_return\n\

	add	%0,%1,%0\n\

	stdcx.	%0,0,%2 \n\

	bne-	1b"

	ISYNC_ON_SMP

	: "=&r" (t)

	: "r" (a), "r" (&v->counter)

	: "cc", "memory");

	return t;

}

#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)

static __inline__ void atomic64_sub(long a, atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

"1:	ldarx	%0,0,%3		# atomic64_sub\n\

	subf	%0,%2,%0\n\

	stdcx.	%0,0,%3 \n\

	bne-	1b"

	: "=&r" (t), "=m" (v->counter)

	: "r" (a), "r" (&v->counter), "m" (v->counter)

	: "cc");

}

static __inline__ long atomic64_sub_return(long a, atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

	EIEIO_ON_SMP

"1:	ldarx	%0,0,%2		# atomic64_sub_return\n\

	subf	%0,%1,%0\n\

	stdcx.	%0,0,%2 \n\

	bne-	1b"

	ISYNC_ON_SMP

	: "=&r" (t)

	: "r" (a), "r" (&v->counter)

	: "cc", "memory");

	return t;

}

static __inline__ void atomic64_inc(atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

"1:	ldarx	%0,0,%2		# atomic64_inc\n\

	addic	%0,%0,1\n\

	stdcx.	%0,0,%2 \n\

	bne-	1b"

	: "=&r" (t), "=m" (v->counter)

	: "r" (&v->counter), "m" (v->counter)

	: "cc");

}

static __inline__ long atomic64_inc_return(atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

	EIEIO_ON_SMP

"1:	ldarx	%0,0,%1		# atomic64_inc_return\n\

	addic	%0,%0,1\n\

	stdcx.	%0,0,%1 \n\

	bne-	1b"

	ISYNC_ON_SMP

	: "=&r" (t)

	: "r" (&v->counter)

	: "cc", "memory");

	return t;

}

/*

 * atomic64_inc_and_test - increment and test

 * @v: pointer of type atomic64_t

 *

 * Atomically increments @v by 1

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

 * other cases.

 */

#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)

static __inline__ void atomic64_dec(atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

"1:	ldarx	%0,0,%2		# atomic64_dec\n\

	addic	%0,%0,-1\n\

	stdcx.	%0,0,%2\n\

	bne-	1b"

	: "=&r" (t), "=m" (v->counter)

	: "r" (&v->counter), "m" (v->counter)

	: "cc");

}

static __inline__ long atomic64_dec_return(atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

	EIEIO_ON_SMP

"1:	ldarx	%0,0,%1		# atomic64_dec_return\n\

	addic	%0,%0,-1\n\

	stdcx.	%0,0,%1\n\

	bne-	1b"

	ISYNC_ON_SMP

	: "=&r" (t)

	: "r" (&v->counter)

	: "cc", "memory");

	return t;

}

#define atomic64_sub_and_test(a, v)	(atomic64_sub_return((a), (v)) == 0)

#define atomic64_dec_and_test(v)	(atomic64_dec_return((v)) == 0)

/*

 * Atomically test *v and decrement if it is greater than 0.

 * The function returns the old value of *v minus 1.

 */

static __inline__ long atomic64_dec_if_positive(atomic64_t *v)

{

	long t;

	__asm__ __volatile__(

	EIEIO_ON_SMP

"1:	ldarx	%0,0,%1		# atomic64_dec_if_positive\n\

	addic.	%0,%0,-1\n\

	blt-	2f\n\

	stdcx.	%0,0,%1\n\

	bne-	1b"

	ISYNC_ON_SMP

	"\n\

2:"	: "=&r" (t)

	: "r" (&v->counter)

	: "cc", "memory");

	return t;

}

#endif /* __powerpc64__ */

#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_ATOMIC_H_ */