1 files changed, 59 insertions, 0 deletions

diff --git a/include/asm-i386/byteorder.h b/include/asm-i386/byteorder.h
new file mode 100644
index 000000000000..a0d73f48d5be
--- /dev/null
+++ b/include/asm-i386/byteorder.h
@@ -0,0 +1,59 @@
+#ifndef _I386_BYTEORDER_H
+#define _I386_BYTEORDER_H
+
+#include <asm/types.h>
+#include <linux/compiler.h>
+
+#ifdef __GNUC__
+
+/* For avoiding bswap on i386 */
+#ifdef __KERNEL__
+#include <linux/config.h>
+#endif
+
+static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
+{
+#ifdef CONFIG_X86_BSWAP
+        __asm__("bswap %0" : "=r" (x) : "0" (x));
+#else
+        __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;     
+} 
+
+/* 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 /* _I386_BYTEORDER_H */