1 files changed, 76 insertions, 0 deletions

diff --git a/include/asm-ppc/byteorder.h b/include/asm-ppc/byteorder.h
new file mode 100644
index 000000000000..c63c81ec7968
--- /dev/null
+++ b/include/asm-ppc/byteorder.h
@@ -0,0 +1,76 @@
+#ifndef _PPC_BYTEORDER_H
+#define _PPC_BYTEORDER_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#ifdef __GNUC__
+#ifdef __KERNEL__
+
+extern __inline__ unsigned ld_le16(const volatile unsigned short *addr)
+{
+        unsigned val;
+
+        __asm__ __volatile__ ("lhbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+        return val;
+}
+
+extern __inline__ void st_le16(volatile unsigned short *addr, const unsigned val)
+{
+        __asm__ __volatile__ ("sthbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+extern __inline__ unsigned ld_le32(const volatile unsigned *addr)
+{
+        unsigned val;
+
+        __asm__ __volatile__ ("lwbrx %0,0,%1" : "=r" (val) : "r" (addr), "m" (*addr));
+        return val;
+}
+
+extern __inline__ void st_le32(volatile unsigned *addr, const unsigned val)
+{
+        __asm__ __volatile__ ("stwbrx %1,0,%2" : "=m" (*addr) : "r" (val), "r" (addr));
+}
+
+static __inline__ __attribute_const__ __u16 ___arch__swab16(__u16 value)
+{
+        __u16 result;
+
+        __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (value >> 8), "r" (value));
+        return result;
+}
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 value)
+{
+        __u32 result;
+
+        __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (value>>24), "r" (value));
+        __asm__("rlwimi %0,%2,8,8,15"   : "=&r" (result) : "0" (result),    "r" (value));
+        __asm__("rlwimi %0,%2,24,0,7"   : "=&r" (result) : "0" (result),    "r" (value));
+
+        return result;
+}
+#define __arch__swab32(x) ___arch__swab32(x)
+#define __arch__swab16(x) ___arch__swab16(x)
+
+/* The same, but returns converted value from the location pointer by addr. */
+#define __arch__swab16p(addr) ld_le16(addr)
+#define __arch__swab32p(addr) ld_le32(addr)
+
+/* The same, but do the conversion in situ, ie. put the value back to addr. */
+#define __arch__swab16s(addr) st_le16(addr,*addr)
+#define __arch__swab32s(addr) st_le32(addr,*addr)
+
+#endif /* __KERNEL__ */
+
+#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
+#  define __BYTEORDER_HAS_U64__
+#  define __SWAB_64_THRU_32__
+#endif
+
+#endif /* __GNUC__ */
+
+#include <linux/byteorder/big_endian.h>
+
+#endif /* _PPC_BYTEORDER_H */