1 files changed, 128 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/atomic_64.h b/arch/sparc/include/asm/atomic_64.h
new file mode 100644
index 00000000000..2c71ec4a3b1
--- /dev/null
+++ b/arch/sparc/include/asm/atomic_64.h
@@ -0,0 +1,128 @@
+/* atomic.h: Thankfully the V9 is at least reasonable for this
+ *           stuff.
+ *
+ * Copyright (C) 1996, 1997, 2000 David S. Miller (davem@redhat.com)
+ */
+
+#ifndef __ARCH_SPARC64_ATOMIC__
+#define __ARCH_SPARC64_ATOMIC__
+
+#include <linux/types.h>
+#include <asm/system.h>
+
+typedef struct { volatile int counter; } atomic_t;
+typedef struct { volatile __s64 counter; } atomic64_t;
+
+#define ATOMIC_INIT(i)		{ (i) }
+#define ATOMIC64_INIT(i)	{ (i) }
+
+#define atomic_read(v)		((v)->counter)
+#define atomic64_read(v)	((v)->counter)
+
+#define atomic_set(v, i)	(((v)->counter) = i)
+#define atomic64_set(v, i)	(((v)->counter) = i)
+
+extern void atomic_add(int, atomic_t *);
+extern void atomic64_add(int, atomic64_t *);
+extern void atomic_sub(int, atomic_t *);
+extern void atomic64_sub(int, atomic64_t *);
+
+extern int atomic_add_ret(int, atomic_t *);
+extern int atomic64_add_ret(int, atomic64_t *);
+extern int atomic_sub_ret(int, atomic_t *);
+extern int atomic64_sub_ret(int, atomic64_t *);
+
+#define atomic_dec_return(v) atomic_sub_ret(1, v)
+#define atomic64_dec_return(v) atomic64_sub_ret(1, v)
+
+#define atomic_inc_return(v) atomic_add_ret(1, v)
+#define atomic64_inc_return(v) atomic64_add_ret(1, v)
+
+#define atomic_sub_return(i, v) atomic_sub_ret(i, v)
+#define atomic64_sub_return(i, v) atomic64_sub_ret(i, v)
+
+#define atomic_add_return(i, v) atomic_add_ret(i, v)
+#define atomic64_add_return(i, v) atomic64_add_ret(i, v)
+
+/*
+ * 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)
+#define atomic64_inc_and_test(v) (atomic64_inc_return(v) == 0)
+
+#define atomic_sub_and_test(i, v) (atomic_sub_ret(i, v) == 0)
+#define atomic64_sub_and_test(i, v) (atomic64_sub_ret(i, v) == 0)
+
+#define atomic_dec_and_test(v) (atomic_sub_ret(1, v) == 0)
+#define atomic64_dec_and_test(v) (atomic64_sub_ret(1, v) == 0)
+
+#define atomic_inc(v) atomic_add(1, v)
+#define atomic64_inc(v) atomic64_add(1, v)
+
+#define atomic_dec(v) atomic_sub(1, v)
+#define atomic64_dec(v) atomic64_sub(1, v)
+
+#define atomic_add_negative(i, v) (atomic_add_ret(i, v) < 0)
+#define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
+
+#define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
+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 atomic64_cmpxchg(v, o, n) \
+	((__typeof__((v)->counter))cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+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)
+
+/* Atomic operations are already serializing */
+#ifdef CONFIG_SMP
+#define smp_mb__before_atomic_dec()	membar_storeload_loadload();
+#define smp_mb__after_atomic_dec()	membar_storeload_storestore();
+#define smp_mb__before_atomic_inc()	membar_storeload_loadload();
+#define smp_mb__after_atomic_inc()	membar_storeload_storestore();
+#else
+#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()
+#endif
+
+#include <asm-generic/atomic.h>
+#endif /* !(__ARCH_SPARC64_ATOMIC__) */