x86: merge byteorder_32/64.h

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 70 insertions, 11 deletions

diff --git a/include/asm-x86/byteorder.h b/include/asm-x86/byteorder.h
index eb14b1870ed..1f2d6d5bf20 100644
--- a/include/asm-x86/byteorder.h
+++ b/include/asm-x86/byteorder.h
@@ -1,13 +1,72 @@
-#ifdef __KERNEL__
-# ifdef CONFIG_X86_32
-#  include "byteorder_32.h"
-# else
-#  include "byteorder_64.h"
-# endif
+#ifndef _ASM_X86_BYTEORDER_H
+#define _ASM_X86_BYTEORDER_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#ifdef __GNUC__
+
+#ifdef __i386__
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+#ifdef CONFIG_X86_BSWAP
+	__asm__("bswap %0" : "=r" (x) : "0" (x));
 #else
-# ifdef __i386__
-#  include "byteorder_32.h"
-# else
-#  include "byteorder_64.h"
-# endif
+	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
+		"rorl $16,%0\n\t"	/* swap words		*/
+		"xchgb %b0,%h0"		/* swap higher bytes	*/
+		:"=q" (x)
+		: "0" (x));
 #endif
+	return x;
+}
+
+static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
+{
+	union {
+		struct { __u32 a,b; } s;
+		__u64 u;
+	} v;
+	v.u = val;
+#ifdef CONFIG_X86_BSWAP
+	asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
+	    : "=r" (v.s.a), "=r" (v.s.b)
+	    : "0" (v.s.a), "1" (v.s.b));
+#else
+	v.s.a = ___arch__swab32(v.s.a);
+	v.s.b = ___arch__swab32(v.s.b);
+	asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
+#endif
+	return v.u;
+}
+
+#else /* __i386__ */
+
+static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
+{
+	__asm__("bswapq %0" : "=r" (x) : "0" (x));
+	return x;
+}
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+	__asm__("bswapl %0" : "=r" (x) : "0" (x));
+	return x;
+}
+
+#endif
+
+/* Do not define swab16.  Gcc is smart enough to recognize "C" version and
+   convert it into rotation or exhange.  */
+
+#define __arch__swab64(x) ___arch__swab64(x)
+#define __arch__swab32(x) ___arch__swab32(x)
+
+#define __BYTEORDER_HAS_U64__
+
+#endif /* __GNUC__ */
+
+#include <linux/byteorder/little_endian.h>
+
+#endif /* _ASM_X86_BYTEORDER_H */