1#ifndef _ASM_X86_BYTEORDER_H
2#define _ASM_X86_BYTEORDER_H
3
4#include <asm/types.h>
5
6#ifdef __GNUC__
7
8#ifdef __i386__
9
10static __inline__ __u32 ___arch__swab32(__u32 x)
11{
12#ifdef CONFIG_X86_BSWAP
13	__asm__("bswap %0" : "=r" (x) : "0" (x));
14#else
15	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
16		"rorl $16,%0\n\t"	/* swap words		*/
17		"xchgb %b0,%h0"		/* swap higher bytes	*/
18		:"=q" (x)
19		: "0" (x));
20#endif
21	return x;
22}
23
24static __inline__ __u64 ___arch__swab64(__u64 val)
25{
26	union {
27		struct { __u32 a,b; } s;
28		__u64 u;
29	} v;
30	v.u = val;
31#ifdef CONFIG_X86_BSWAP
32	__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
33	    : "=r" (v.s.a), "=r" (v.s.b)
34	    : "0" (v.s.a), "1" (v.s.b));
35#else
36	v.s.a = ___arch__swab32(v.s.a);
37	v.s.b = ___arch__swab32(v.s.b);
38	__asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
39#endif
40	return v.u;
41}
42
43#else /* __i386__ */
44
45static __inline__ __u64 ___arch__swab64(__u64 x)
46{
47	__asm__("bswapq %0" : "=r" (x) : "0" (x));
48	return x;
49}
50
51static __inline__ __u32 ___arch__swab32(__u32 x)
52{
53	__asm__("bswapl %0" : "=r" (x) : "0" (x));
54	return x;
55}
56
57#endif
58
59/* Do not define swab16.  Gcc is smart enough to recognize "C" version and
60   convert it into rotation or exhange.  */
61
62#define __arch__swab64(x) ___arch__swab64(x)
63#define __arch__swab32(x) ___arch__swab32(x)
64
65#define __BYTEORDER_HAS_U64__
66
67#endif /* __GNUC__ */
68
69#include <linux/byteorder/little_endian.h>
70
71#endif /* _ASM_X86_BYTEORDER_H */
72