Initial import

1 files changed, 481 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/atomic.h b/arch/powerpc/include/asm/atomic.h
new file mode 100644
index 000000000..512d2782b
--- /dev/null
+++ b/arch/powerpc/include/asm/atomic.h
@@ -0,0 +1,481 @@
+#ifndef _ASM_POWERPC_ATOMIC_H_
+#define _ASM_POWERPC_ATOMIC_H_
+
+/*
+ * PowerPC atomic operations
+ */
+
+#ifdef __KERNEL__
+#include <linux/types.h>
+#include <asm/cmpxchg.h>
+#include <asm/barrier.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));
+}
+
+#define ATOMIC_OP(op, asm_op)						\
+static __inline__ void atomic_##op(int a, atomic_t *v)			\
+{									\
+	int t;								\
+									\
+	__asm__ __volatile__(						\
+"1:	lwarx	%0,0,%3		# atomic_" #op "\n"			\
+	#asm_op " %0,%2,%0\n"						\
+	PPC405_ERR77(0,%3)						\
+"	stwcx.	%0,0,%3 \n"						\
+"	bne-	1b\n"							\
+	: "=&r" (t), "+m" (v->counter)					\
+	: "r" (a), "r" (&v->counter)					\
+	: "cc");							\
+}									\
+
+#define ATOMIC_OP_RETURN(op, asm_op)					\
+static __inline__ int atomic_##op##_return(int a, atomic_t *v)		\
+{									\
+	int t;								\
+									\
+	__asm__ __volatile__(						\
+	PPC_ATOMIC_ENTRY_BARRIER					\
+"1:	lwarx	%0,0,%2		# atomic_" #op "_return\n"		\
+	#asm_op " %0,%1,%0\n"						\
+	PPC405_ERR77(0,%2)						\
+"	stwcx.	%0,0,%2 \n"						\
+"	bne-	1b\n"							\
+	PPC_ATOMIC_EXIT_BARRIER						\
+	: "=&r" (t)							\
+	: "r" (a), "r" (&v->counter)					\
+	: "cc", "memory");						\
+									\
+	return t;							\
+}
+
+#define ATOMIC_OPS(op, asm_op) ATOMIC_OP(op, asm_op) ATOMIC_OP_RETURN(op, asm_op)
+
+ATOMIC_OPS(add, add)
+ATOMIC_OPS(sub, subf)
+
+#undef ATOMIC_OPS
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
+
+#define atomic_add_negative(a, v)	(atomic_add_return((a), (v)) < 0)
+
+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;
+}
+
+/**
+ * atomic_inc_not_zero - increment unless the number is zero
+ * @v: pointer of type atomic_t
+ *
+ * Atomically increments @v by 1, so long as @v is non-zero.
+ * Returns non-zero if @v was non-zero, and zero otherwise.
+ */
+static __inline__ int atomic_inc_not_zero(atomic_t *v)
+{
+	int t1, t2;
+
+	__asm__ __volatile__ (
+	PPC_ATOMIC_ENTRY_BARRIER
+"1:	lwarx	%0,0,%2		# atomic_inc_not_zero\n\
+	cmpwi	0,%0,0\n\
+	beq-	2f\n\
+	addic	%1,%0,1\n"
+	PPC405_ERR77(0,%2)
+"	stwcx.	%1,0,%2\n\
+	bne-	1b\n"
+	PPC_ATOMIC_EXIT_BARRIER
+	"\n\
+2:"
+	: "=&r" (t1), "=&r" (t2)
+	: "r" (&v->counter)
+	: "cc", "xer", "memory");
+
+	return t1;
+}
+#define atomic_inc_not_zero(v) atomic_inc_not_zero((v))
+
+#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 atomic_dec_if_positive atomic_dec_if_positive
+
+#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));
+}
+
+#define ATOMIC64_OP(op, asm_op)						\
+static __inline__ void atomic64_##op(long a, atomic64_t *v)		\
+{									\
+	long t;								\
+									\
+	__asm__ __volatile__(						\
+"1:	ldarx	%0,0,%3		# atomic64_" #op "\n"			\
+	#asm_op " %0,%2,%0\n"						\
+"	stdcx.	%0,0,%3 \n"						\
+"	bne-	1b\n"							\
+	: "=&r" (t), "+m" (v->counter)					\
+	: "r" (a), "r" (&v->counter)					\
+	: "cc");							\
+}
+
+#define ATOMIC64_OP_RETURN(op, asm_op)					\
+static __inline__ long atomic64_##op##_return(long a, atomic64_t *v)	\
+{									\
+	long t;								\
+									\
+	__asm__ __volatile__(						\
+	PPC_ATOMIC_ENTRY_BARRIER					\
+"1:	ldarx	%0,0,%2		# atomic64_" #op "_return\n"		\
+	#asm_op " %0,%1,%0\n"						\
+"	stdcx.	%0,0,%2 \n"						\
+"	bne-	1b\n"							\
+	PPC_ATOMIC_EXIT_BARRIER						\
+	: "=&r" (t)							\
+	: "r" (a), "r" (&v->counter)					\
+	: "cc", "memory");						\
+									\
+	return t;							\
+}
+
+#define ATOMIC64_OPS(op, asm_op) ATOMIC64_OP(op, asm_op) ATOMIC64_OP_RETURN(op, asm_op)
+
+ATOMIC64_OPS(add, add)
+ATOMIC64_OPS(sub, subf)
+
+#undef ATOMIC64_OPS
+#undef ATOMIC64_OP_RETURN
+#undef ATOMIC64_OP
+
+#define atomic64_add_negative(a, v)	(atomic64_add_return((a), (v)) < 0)
+
+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;
+}
+
+/**
+ * atomic_inc64_not_zero - increment unless the number is zero
+ * @v: pointer of type atomic64_t
+ *
+ * Atomically increments @v by 1, so long as @v is non-zero.
+ * Returns non-zero if @v was non-zero, and zero otherwise.
+ */
+static __inline__ long atomic64_inc_not_zero(atomic64_t *v)
+{
+	long t1, t2;
+
+	__asm__ __volatile__ (
+	PPC_ATOMIC_ENTRY_BARRIER
+"1:	ldarx	%0,0,%2		# atomic64_inc_not_zero\n\
+	cmpdi	0,%0,0\n\
+	beq-	2f\n\
+	addic	%1,%0,1\n\
+	stdcx.	%1,0,%2\n\
+	bne-	1b\n"
+	PPC_ATOMIC_EXIT_BARRIER
+	"\n\
+2:"
+	: "=&r" (t1), "=&r" (t2)
+	: "r" (&v->counter)
+	: "cc", "xer", "memory");
+
+	return t1;
+}
+
+#endif /* __powerpc64__ */
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_POWERPC_ATOMIC_H_ */