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 */