[RFC PATCH 09/18] powerpc/boot: define byteswapping routines for little endian

[Cédric Le Goater]

These are not the most efficient versions of swab but the wrapper does
not do much byte swapping. On a big endian cpu, these routines are
a no-op.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---
 arch/powerpc/boot/of.h   |    7 +++++++
 arch/powerpc/boot/swab.h |   29 +++++++++++++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 arch/powerpc/boot/swab.h

diff --git a/arch/powerpc/boot/of.h b/arch/powerpc/boot/of.h
index bf228fea3517..fc71848f6962 100644
--- a/arch/powerpc/boot/of.h
+++ b/arch/powerpc/boot/of.h
@@ -1,6 +1,8 @@
 #ifndef _PPC_BOOT_OF_H_
 #define _PPC_BOOT_OF_H_
 
+#include "swab.h"
+
 typedef void *phandle;
 typedef u32 ihandle;
 
@@ -21,7 +23,12 @@ void of_console_init(void);
 
 typedef u32			__be32;
 
+#ifdef __LITTLE_ENDIAN__
+#define cpu_to_be32(x) swab32(x)
+#define be32_to_cpu(x) swab32(x)
+#else
 #define cpu_to_be32(x) (x)
 #define be32_to_cpu(x) (x)
+#endif
 
 #endif /* _PPC_BOOT_OF_H_ */
diff --git a/arch/powerpc/boot/swab.h b/arch/powerpc/boot/swab.h
new file mode 100644
index 000000000000..d0e1431084ca
--- /dev/null
+++ b/arch/powerpc/boot/swab.h
@@ -0,0 +1,29 @@
+#ifndef _PPC_BOOT_SWAB_H_
+#define _PPC_BOOT_SWAB_H_
+
+static inline u16 swab16(u16 x)
+{
+	return  ((x & (u16)0x00ffU) << 8) |
+		((x & (u16)0xff00U) >> 8);
+}
+
+static inline u32 swab32(u32 x)
+{
+	return  ((x & (u32)0x000000ffUL) << 24) |
+		((x & (u32)0x0000ff00UL) <<  8) |
+		((x & (u32)0x00ff0000UL) >>  8) |
+		((x & (u32)0xff000000UL) >> 24);
+}
+
+static inline u64 swab64(u64 x)
+{
+	return  (u64)((x & (u64)0x00000000000000ffULL) << 56) |
+		(u64)((x & (u64)0x000000000000ff00ULL) << 40) |
+		(u64)((x & (u64)0x0000000000ff0000ULL) << 24) |
+		(u64)((x & (u64)0x00000000ff000000ULL) <<  8) |
+		(u64)((x & (u64)0x000000ff00000000ULL) >>  8) |
+		(u64)((x & (u64)0x0000ff0000000000ULL) >> 24) |
+		(u64)((x & (u64)0x00ff000000000000ULL) >> 40) |
+		(u64)((x & (u64)0xff00000000000000ULL) >> 56);
+}
+#endif /* _PPC_BOOT_SWAB_H_ */
-- 
1.7.10.4