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)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 
___arch__swab16(__u16 x)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 */
45