arch/powerpc/include/asm/atomic.h - kernel/mindspeed - Git at Google

 #ifndef _ASM_POWERPC_ATOMIC_H_
 #define _ASM_POWERPC_ATOMIC_H_

 /*
  * PowerPC atomic operations
  */

 #include <linux/types.h>

 #ifdef __KERNEL__
 #include <linux/compiler.h>
 #include <asm/synch.h>
 #include <asm/asm-compat.h>
 #include <asm/system.h>

 #define ATOMIC_INIT(i)		{ (i) }

 static __inline__ int atomic_read(const atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));

 	return t;
 }

 static __inline__ void atomic_set(atomic_t *v, int i)
 {
 	__asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
 }

 static __inline__ void atomic_add(int a, atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%3		# atomic_add\n\
 	add	%0,%2,%0\n"
 	PPC405_ERR77(0,%3)
 "	stwcx.	%0,0,%3 \n\
 	bne-	1b"
 	: "=&r" (t), "+m" (v->counter)
 	: "r" (a), "r" (&v->counter)
 	: "cc");
 }

 static __inline__ int atomic_add_return(int a, atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%2		# atomic_add_return\n\
 	add	%0,%1,%0\n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%2 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (a), "r" (&v->counter)
 	: "cc", "memory");

 	return t;
 }

 #define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)

 static __inline__ void atomic_sub(int a, atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%3		# atomic_sub\n\
 	subf	%0,%2,%0\n"
 	PPC405_ERR77(0,%3)
 "	stwcx.	%0,0,%3 \n\
 	bne-	1b"
 	: "=&r" (t), "+m" (v->counter)
 	: "r" (a), "r" (&v->counter)
 	: "cc");
 }

 static __inline__ int atomic_sub_return(int a, atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%2		# atomic_sub_return\n\
 	subf	%0,%1,%0\n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%2 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (a), "r" (&v->counter)
 	: "cc", "memory");

 	return t;
 }

 static __inline__ void atomic_inc(atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%2		# atomic_inc\n\
 	addic	%0,%0,1\n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%2 \n\
 	bne-	1b"
 	: "=&r" (t), "+m" (v->counter)
 	: "r" (&v->counter)
 	: "cc", "xer");
 }

 static __inline__ int atomic_inc_return(atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%1		# atomic_inc_return\n\
 	addic	%0,%0,1\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "xer", "memory");

 	return t;
 }

 /*
  * 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.
  */
 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)

 static __inline__ void atomic_dec(atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%2		# atomic_dec\n\
 	addic	%0,%0,-1\n"
 	PPC405_ERR77(0,%2)\
 "	stwcx.	%0,0,%2\n\
 	bne-	1b"
 	: "=&r" (t), "+m" (v->counter)
 	: "r" (&v->counter)
 	: "cc", "xer");
 }

 static __inline__ int atomic_dec_return(atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%1		# atomic_dec_return\n\
 	addic	%0,%0,-1\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1\n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "xer", "memory");

 	return t;
 }

 #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 #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 the old value of @v.
  */
 static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
 {
 	int t;

 	__asm__ __volatile__ (
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%1		# __atomic_add_unless\n\
 	cmpw	0,%0,%3 \n\
 	beq-	2f \n\
 	add	%0,%2,%0 \n"
 	PPC405_ERR77(0,%2)
 "	stwcx.	%0,0,%1 \n\
 	bne-	1b \n"
 	PPC_ATOMIC_EXIT_BARRIER
 "	subf	%0,%2,%0 \n\
 2:"
 	: "=&r" (t)
 	: "r" (&v->counter), "r" (a), "r" (u)
 	: "cc", "memory");

 	return t;
 }


 #define atomic_sub_and_test(a, v)	(atomic_sub_return((a), (v)) == 0)
 #define atomic_dec_and_test(v)		(atomic_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, even if
  * the atomic variable, v, was not decremented.
  */
 static __inline__ int atomic_dec_if_positive(atomic_t *v)
 {
 	int t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	lwarx	%0,0,%1		# atomic_dec_if_positive\n\
 	cmpwi	%0,1\n\
 	addi	%0,%0,-1\n\
 	blt-	2f\n"
 	PPC405_ERR77(0,%1)
 "	stwcx.	%0,0,%1\n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	"\n\
 2:"	: "=&b" (t)
 	: "r" (&v->counter)
 	: "cc", "memory");

 	return t;
 }

 #define smp_mb__before_atomic_dec()     smp_mb()
 #define smp_mb__after_atomic_dec()      smp_mb()
 #define smp_mb__before_atomic_inc()     smp_mb()
 #define smp_mb__after_atomic_inc()      smp_mb()

 #ifdef __powerpc64__

 #define ATOMIC64_INIT(i)	{ (i) }

 static __inline__ long atomic64_read(const atomic64_t *v)
 {
 	long t;

 	__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));

 	return t;
 }

 static __inline__ void atomic64_set(atomic64_t *v, long i)
 {
 	__asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(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)
 	: "cc");
 }

 static __inline__ long atomic64_add_return(long a, atomic64_t *v)
 {
 	long t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	ldarx	%0,0,%2		# atomic64_add_return\n\
 	add	%0,%1,%0\n\
 	stdcx.	%0,0,%2 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&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)
 	: "cc");
 }

 static __inline__ long atomic64_sub_return(long a, atomic64_t *v)
 {
 	long t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	ldarx	%0,0,%2		# atomic64_sub_return\n\
 	subf	%0,%1,%0\n\
 	stdcx.	%0,0,%2 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&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)
 	: "cc", "xer");
 }

 static __inline__ long atomic64_inc_return(atomic64_t *v)
 {
 	long t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	ldarx	%0,0,%1		# atomic64_inc_return\n\
 	addic	%0,%0,1\n\
 	stdcx.	%0,0,%1 \n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "xer", "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)
 	: "cc", "xer");
 }

 static __inline__ long atomic64_dec_return(atomic64_t *v)
 {
 	long t;

 	__asm__ __volatile__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	ldarx	%0,0,%1		# atomic64_dec_return\n\
 	addic	%0,%0,-1\n\
 	stdcx.	%0,0,%1\n\
 	bne-	1b"
 	PPC_ATOMIC_EXIT_BARRIER
 	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "xer", "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__(
 	PPC_ATOMIC_ENTRY_BARRIER
 "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"
 	PPC_ATOMIC_EXIT_BARRIER
 	"\n\
 2:"	: "=&r" (t)
 	: "r" (&v->counter)
 	: "cc", "xer", "memory");

 	return t;
 }

 #define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
 #define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

 /**
  * 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 the old value of @v.
  */
 static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
 {
 	long t;

 	__asm__ __volatile__ (
 	PPC_ATOMIC_ENTRY_BARRIER
 "1:	ldarx	%0,0,%1		# __atomic_add_unless\n\
 	cmpd	0,%0,%3 \n\
 	beq-	2f \n\
 	add	%0,%2,%0 \n"
 "	stdcx.	%0,0,%1 \n\
 	bne-	1b \n"
 	PPC_ATOMIC_EXIT_BARRIER
 "	subf	%0,%2,%0 \n\
 2:"
 	: "=&r" (t)
 	: "r" (&v->counter), "r" (a), "r" (u)
 	: "cc", "memory");

 	return t != u;
 }

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

 #endif /* __powerpc64__ */

 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_ATOMIC_H_ */
	#ifndef _ASM_POWERPC_ATOMIC_H_
	#define _ASM_POWERPC_ATOMIC_H_

	/*
	* PowerPC atomic operations
	*/

	#include <linux/types.h>

	#ifdef __KERNEL__
	#include <linux/compiler.h>
	#include <asm/synch.h>
	#include <asm/asm-compat.h>
	#include <asm/system.h>

	#define ATOMIC_INIT(i) { (i) }

	static __inline__ int atomic_read(const atomic_t *v)
	{
	int t;

	__asm__ __volatile__("lwz%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));

	return t;
	}

	static __inline__ void atomic_set(atomic_t *v, int i)
	{
	__asm__ __volatile__("stw%U0%X0 %1,%0" : "=m"(v->counter) : "r"(i));
	}

	static __inline__ void atomic_add(int a, atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	"1: lwarx %0,0,%3 # atomic_add\n\
	add %0,%2,%0\n"
	PPC405_ERR77(0,%3)
	" stwcx. %0,0,%3 \n\
	bne- 1b"
	: "=&r" (t), "+m" (v->counter)
	: "r" (a), "r" (&v->counter)
	: "cc");
	}

	static __inline__ int atomic_add_return(int a, atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%2 # atomic_add_return\n\
	add %0,%1,%0\n"
	PPC405_ERR77(0,%2)
	" stwcx. %0,0,%2 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (a), "r" (&v->counter)
	: "cc", "memory");

	return t;
	}

	#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)

	static __inline__ void atomic_sub(int a, atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	"1: lwarx %0,0,%3 # atomic_sub\n\
	subf %0,%2,%0\n"
	PPC405_ERR77(0,%3)
	" stwcx. %0,0,%3 \n\
	bne- 1b"
	: "=&r" (t), "+m" (v->counter)
	: "r" (a), "r" (&v->counter)
	: "cc");
	}

	static __inline__ int atomic_sub_return(int a, atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%2 # atomic_sub_return\n\
	subf %0,%1,%0\n"
	PPC405_ERR77(0,%2)
	" stwcx. %0,0,%2 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (a), "r" (&v->counter)
	: "cc", "memory");

	return t;
	}

	static __inline__ void atomic_inc(atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	"1: lwarx %0,0,%2 # atomic_inc\n\
	addic %0,%0,1\n"
	PPC405_ERR77(0,%2)
	" stwcx. %0,0,%2 \n\
	bne- 1b"
	: "=&r" (t), "+m" (v->counter)
	: "r" (&v->counter)
	: "cc", "xer");
	}

	static __inline__ int atomic_inc_return(atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%1 # atomic_inc_return\n\
	addic %0,%0,1\n"
	PPC405_ERR77(0,%1)
	" stwcx. %0,0,%1 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (&v->counter)
	: "cc", "xer", "memory");

	return t;
	}

	/*
	* 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.
	*/
	#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)

	static __inline__ void atomic_dec(atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	"1: lwarx %0,0,%2 # atomic_dec\n\
	addic %0,%0,-1\n"
	PPC405_ERR77(0,%2)\
	" stwcx. %0,0,%2\n\
	bne- 1b"
	: "=&r" (t), "+m" (v->counter)
	: "r" (&v->counter)
	: "cc", "xer");
	}

	static __inline__ int atomic_dec_return(atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%1 # atomic_dec_return\n\
	addic %0,%0,-1\n"
	PPC405_ERR77(0,%1)
	" stwcx. %0,0,%1\n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (&v->counter)
	: "cc", "xer", "memory");

	return t;
	}

	#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
	#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 the old value of @v.
	*/
	static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
	{
	int t;

	__asm__ __volatile__ (
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%1 # __atomic_add_unless\n\
	cmpw 0,%0,%3 \n\
	beq- 2f \n\
	add %0,%2,%0 \n"
	PPC405_ERR77(0,%2)
	" stwcx. %0,0,%1 \n\
	bne- 1b \n"
	PPC_ATOMIC_EXIT_BARRIER
	" subf %0,%2,%0 \n\
	2:"
	: "=&r" (t)
	: "r" (&v->counter), "r" (a), "r" (u)
	: "cc", "memory");

	return t;
	}


	#define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
	#define atomic_dec_and_test(v) (atomic_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, even if
	* the atomic variable, v, was not decremented.
	*/
	static __inline__ int atomic_dec_if_positive(atomic_t *v)
	{
	int t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
	cmpwi %0,1\n\
	addi %0,%0,-1\n\
	blt- 2f\n"
	PPC405_ERR77(0,%1)
	" stwcx. %0,0,%1\n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	"\n\
	2:" : "=&b" (t)
	: "r" (&v->counter)
	: "cc", "memory");

	return t;
	}

	#define smp_mb__before_atomic_dec() smp_mb()
	#define smp_mb__after_atomic_dec() smp_mb()
	#define smp_mb__before_atomic_inc() smp_mb()
	#define smp_mb__after_atomic_inc() smp_mb()

	#ifdef __powerpc64__

	#define ATOMIC64_INIT(i) { (i) }

	static __inline__ long atomic64_read(const atomic64_t *v)
	{
	long t;

	__asm__ __volatile__("ld%U1%X1 %0,%1" : "=r"(t) : "m"(v->counter));

	return t;
	}

	static __inline__ void atomic64_set(atomic64_t *v, long i)
	{
	__asm__ __volatile__("std%U0%X0 %1,%0" : "=m"(v->counter) : "r"(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)
	: "cc");
	}

	static __inline__ long atomic64_add_return(long a, atomic64_t *v)
	{
	long t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: ldarx %0,0,%2 # atomic64_add_return\n\
	add %0,%1,%0\n\
	stdcx. %0,0,%2 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&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)
	: "cc");
	}

	static __inline__ long atomic64_sub_return(long a, atomic64_t *v)
	{
	long t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: ldarx %0,0,%2 # atomic64_sub_return\n\
	subf %0,%1,%0\n\
	stdcx. %0,0,%2 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&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)
	: "cc", "xer");
	}

	static __inline__ long atomic64_inc_return(atomic64_t *v)
	{
	long t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: ldarx %0,0,%1 # atomic64_inc_return\n\
	addic %0,%0,1\n\
	stdcx. %0,0,%1 \n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (&v->counter)
	: "cc", "xer", "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)
	: "cc", "xer");
	}

	static __inline__ long atomic64_dec_return(atomic64_t *v)
	{
	long t;

	__asm__ __volatile__(
	PPC_ATOMIC_ENTRY_BARRIER
	"1: ldarx %0,0,%1 # atomic64_dec_return\n\
	addic %0,%0,-1\n\
	stdcx. %0,0,%1\n\
	bne- 1b"
	PPC_ATOMIC_EXIT_BARRIER
	: "=&r" (t)
	: "r" (&v->counter)
	: "cc", "xer", "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__(
	PPC_ATOMIC_ENTRY_BARRIER
	"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"
	PPC_ATOMIC_EXIT_BARRIER
	"\n\
	2:" : "=&r" (t)
	: "r" (&v->counter)
	: "cc", "xer", "memory");

	return t;
	}

	#define atomic64_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
	#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

	/**
	* 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 the old value of @v.
	*/
	static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
	{
	long t;

	__asm__ __volatile__ (
	PPC_ATOMIC_ENTRY_BARRIER
	"1: ldarx %0,0,%1 # __atomic_add_unless\n\
	cmpd 0,%0,%3 \n\
	beq- 2f \n\
	add %0,%2,%0 \n"
	" stdcx. %0,0,%1 \n\
	bne- 1b \n"
	PPC_ATOMIC_EXIT_BARRIER
	" subf %0,%2,%0 \n\
	2:"
	: "=&r" (t)
	: "r" (&v->counter), "r" (a), "r" (u)
	: "cc", "memory");

	return t != u;
	}

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

	#endif /* __powerpc64__ */

	#endif /* __KERNEL__ */
	#endif /* _ASM_POWERPC_ATOMIC_H_ */