1 #ifndef _I386_BYTEORDER_H 2 #define _I386_BYTEORDER_H 3 4 #include <asm/types.h> 5 6 #ifdef __GNUC__ 7 8 ___arch__swab32(__u32 x)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 ___arch__swab16(__u16 x)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