LXR uboot/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
   9static __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
  20static __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 */
  45