1 #ifndef _I386_BYTEORDER_H
2 #define _I386_BYTEORDER_H
3 
4 #include <asm/types.h>
5 
6 #ifdef __GNUC__
7 
___arch__swab32(__u32 x)8 static __inline__ __u32 ___arch__swab32(__u32 x)
9 {
10 	__asm__("bswap %0" : "=r" (x) : "0" (x));
11 
12 	return x;
13 }
14 
15 #define _constant_swab16(x) ((__u16)(				\
16 	(((__u16)(x) & (__u16)0x00ffU) << 8) |			\
17 	(((__u16)(x) & (__u16)0xff00U) >> 8)))
18 
___arch__swab16(__u16 x)19 static __inline__ __u16 ___arch__swab16(__u16 x)
20 {
21 #if CONFIG_IS_ENABLED(X86_64)
22 	return _constant_swab16(x);
23 #else
24 	__asm__("xchgb %b0,%h0"		/* swap bytes		*/ \
25 		: "=q" (x) \
26 		:  "0" (x)); \
27 		return x;
28 #endif
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 */
44