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         __asm__("bswap %0" : "=r" (x) : "0" (x));
  12
  13         return x;
  14 }
  15
  16 #define _constant_swab16(x) ((__u16)(                           \
  17         (((__u16)(x) & (__u16)0x00ffU) << 8) |                  \
  18         (((__u16)(x) & (__u16)0xff00U) >> 8)))
  19
  20 static __inline__ __u16 ___arch__swab16(__u16 x)
  21 {
  22 #if CONFIG_IS_ENABLED(X86_64)
  23         return _constant_swab16(x);
  24 #else
  25         __asm__("xchgb %b0,%h0"         /* swap bytes           */ \
  26                 : "=q" (x) \
  27                 :  "0" (x)); \
  28                 return x;
  29 #endif
  30 }
  31
  32 #define __arch__swab32(x) ___arch__swab32(x)
  33 #define __arch__swab16(x) ___arch__swab16(x)
  34
  35 #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
  36 #  define __BYTEORDER_HAS_U64__
  37 #  define __SWAB_64_THRU_32__
  38 #endif
  39
  40 #endif /* __GNUC__ */
  41
  42 #include <linux/byteorder/little_endian.h>
  43
  44 #endif /* _I386_BYTEORDER_H */