sh: introduce asm/swab.h

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/arch/sh/include/asm/swab.h b/arch/sh/include/asm/swab.h
new file mode 100644
index 000000000000..e69315935107
--- /dev/null
+++ b/arch/sh/include/asm/swab.h
@@ -0,0 +1,60 @@
+#ifndef __ASM_SH_SWAB_H
+#define __ASM_SH_SWAB_H
+
+/*
+ * Copyright (C) 1999  Niibe Yutaka
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ */
+#include <linux/compiler.h>
+#include <linux/types.h>
+
+#define __SWAB_64_THRU_32__
+
+static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
+{
+	__asm__(
+#ifdef __SH5__
+		"byterev	%0, %0\n\t"
+		"shari		%0, 32, %0"
+#else
+		"swap.b		%0, %0\n\t"
+		"swap.w		%0, %0\n\t"
+		"swap.b		%0, %0"
+#endif
+		: "=r" (x)
+		: "0" (x));
+
+	return x;
+}
+#define __arch_swab32 __arch_swab32
+
+static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
+{
+	__asm__(
+#ifdef __SH5__
+		"byterev	%0, %0\n\t"
+		"shari		%0, 32, %0"
+#else
+		"swap.b		%0, %0"
+#endif
+		: "=r" (x)
+		:  "0" (x));
+
+	return x;
+}
+#define __arch_swab16 __arch_swab16
+
+static inline __u64 __arch_swab64(__u64 val)
+{
+	union {
+		struct { __u32 a,b; } s;
+		__u64 u;
+	} v, w;
+	v.u = val;
+	w.s.b = __arch_swab32(v.s.a);
+	w.s.a = __arch_swab32(v.s.b);
+	return w.u;
+}
+#define __arch_swab64 __arch_swab64
+
+#endif /* __ASM_SH_SWAB_H */