arch/x86/include/asm/byteorder.h

   1 #ifndef _I386_BYTEORDER_H
   2 #define _I386_BYTEORDER_H
   3
   4 #include <asm/types.h>
   5
   6 #ifdef __GNUC__
   7
   8
   9 static __inline__ __u32 ___arch__swab32(__u32 x)
  10 {
  11 #ifdef CONFIG_X86_BSWAP
  12         __asm__("bswap %0" : "=r" (x) : "0" (x));
  13 #else
  14         __asm__("xchgb %b0,%h0\n\t"     /* swap lower bytes     */
  15                 "rorl $16,%0\n\t"       /* swap words           */
  16                 "xchgb %b0,%h0"         /* swap higher bytes    */
  17                 :"=q" (x)
  18                 : "0" (x));
  19 #endif
  20         return x;
  21 }
  22
  23 static __inline__ __u16 ___arch__swab16(__u16 x)
  24 {
  25         __asm__("xchgb %b0,%h0"         /* swap bytes           */ \
  26                 : "=q" (x) \
  27                 :  "0" (x)); \
  28                 return x;
  29 }
  30
  31 #define __arch__swab32(x) ___arch__swab32(x)
  32 #define __arch__swab16(x) ___arch__swab16(x)
  33
  34 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  35 #  define __BYTEORDER_HAS_U64__
  36 #  define __SWAB_64_THRU_32__
  37 #endif
  38
  39 #endif /* __GNUC__ */
  40
  41 #include <linux/byteorder/little_endian.h>
  42
  43 #endif /* _I386_BYTEORDER_H */