#ifndef _LINUX_BYTEORDER_SWAB_H#define _LINUX_BYTEORDER_SWAB_H/* * linux/byteorder/swab.h * Byte-swapping, independently from CPU endianness *	swabXX[ps]?(foo) * * Francois-Rene Rideau <fare@tunes.org> 19971205 *    separated swab functions from cpu_to_XX, *    to clean up support for bizarre-endian architectures. * * See asm-i386/byteorder.h and suches for examples of how to provide * architecture-dependent optimized versions * *//* casts are necessary for constants, because we never know how for sure * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. */#define ___swab16(x) \	((__u16)( \		(((__u16)(x) & (__u16)0x00ffU) << 8) | \		(((__u16)(x) & (__u16)0xff00U) >> 8) ))#define ___swab32(x) \	((__u32)( \		(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \		(((__u32)(x) & (__u32)0x0000ff00UL) <<  8) | \		(((__u32)(x) & (__u32)0x00ff0000UL) >>  8) | \		(((__u32)(x) & (__u32)0xff000000UL) >> 24) ))#define ___swab64(x) \	((__u64)( \		(__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \		(__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \		(__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \		(__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) <<  8) | \		(__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >>  8) | \		(__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \		(__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \		(__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) ))/* * provide defaults when no architecture-specific optimization is detected */#ifndef __arch__swab16#  define __arch__swab16(x) ___swab16(x)#endif#ifndef __arch__swab32#  define __arch__swab32(x) ___swab32(x)#endif#ifndef __arch__swab64#  define __arch__swab64(x) ___swab64(x)#endif#ifndef __arch__swab16p#  define __arch__swab16p(x) __swab16(*(x))#endif#ifndef __arch__swab32p#  define __arch__swab32p(x) __swab32(*(x))#endif#ifndef __arch__swab64p#  define __arch__swab64p(x) __swab64(*(x))#endif#ifndef __arch__swab16s#  define __arch__swab16s(x) do { *(x) = __swab16p((x)); } while (0)#endif#ifndef __arch__swab32s#  define __arch__swab32s(x) do { *(x) = __swab32p((x)); } while (0)#endif#ifndef __arch__swab64s#  define __arch__swab64s(x) do { *(x) = __swab64p((x)); } while (0)#endif/* * Allow constant folding */#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__)#  define __swab16(x) \(__builtin_constant_p((__u16)(x)) ? \ ___swab16((x)) : \ __fswab16((x)))#  define __swab32(x) \(__builtin_constant_p((__u32)(x)) ? \ ___swab32((x)) : \ __fswab32((x)))#  define __swab64(x) \(__builtin_constant_p((__u64)(x)) ? \ ___swab64((x)) : \ __fswab64((x)))#else#  define __swab16(x) __fswab16(x)#  define __swab32(x) __fswab32(x)#  define __swab64(x) __fswab64(x)#endif /* OPTIMIZE */extern __inline__ __const__ __u16 __fswab16(__u16 x){	return __arch__swab16(x);}extern __inline__ __u16 __swab16p(__u16 *x){	return __arch__swab16p(x);}extern __inline__ void __swab16s(__u16 *addr){	__arch__swab16s(addr);}extern __inline__ __const__ __u32 __fswab32(__u32 x){	return __arch__swab32(x);}extern __inline__ __u32 __swab32p(__u32 *x){	return __arch__swab32p(x);}extern __inline__ void __swab32s(__u32 *addr){	__arch__swab32s(addr);}#ifdef __BYTEORDER_HAS_U64__extern __inline__ __const__ __u64 __fswab64(__u64 x){#  ifdef __SWAB_64_THRU_32__	__u32 h = x >> 32;	__u32 l = x & ((1ULL<<32)-1);	return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h)));#  else	return __arch__swab64(x);#  endif}extern __inline__ __u64 __swab64p(__u64 *x){	return __arch__swab64p(x);}extern __inline__ void __swab64s(__u64 *addr){	__arch__swab64s(addr);}#endif /* __BYTEORDER_HAS_U64__ */#if defined(__KERNEL__)#define swab16 __swab16#define swab32 __swab32#define swab64 __swab64#define swab16p __swab16p#define swab32p __swab32p#define swab64p __swab64p#define swab16s __swab16s#define swab32s __swab32s#define swab64s __swab64s#endif#endif /* _LINUX_BYTEORDER_SWAB_H */