1#ifndef _ASM_X86_BYTEORDER_H
2#define _ASM_X86_BYTEORDER_H
3
4#include <asm/types.h>
5#include <linux/compiler.h>
6
7#ifdef __GNUC__
8
9#ifdef __i386__
10
11static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
12{
13#ifdef CONFIG_X86_BSWAP
14	__asm__("bswap %0" : "=r" (x) : "0" (x));
15#else
16	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
17		"rorl $16,%0\n\t"	/* swap words		*/
18		"xchgb %b0,%h0"		/* swap higher bytes	*/
19		:"=q" (x)
20		: "0" (x));
21#endif
22	return x;
23}
24
25static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
26{
27	union {
28		struct { __u32 a,b; } s;
29		__u64 u;
30	} v;
31	v.u = val;
32#ifdef CONFIG_X86_BSWAP
33	__asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
34	    : "=r" (v.s.a), "=r" (v.s.b)
35	    : "0" (v.s.a), "1" (v.s.b));
36#else
37	v.s.a = ___arch__swab32(v.s.a);
38	v.s.b = ___arch__swab32(v.s.b);
39	__asm__("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
40#endif
41	return v.u;
42}
43
44#else /* __i386__ */
45
46static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
47{
48	__asm__("bswapq %0" : "=r" (x) : "0" (x));
49	return x;
50}
51
52static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
53{
54	__asm__("bswapl %0" : "=r" (x) : "0" (x));
55	return x;
56}
57
58#endif
59
60/* Do not define swab16.  Gcc is smart enough to recognize "C" version and
61   convert it into rotation or exhange.  */
62
63#define __arch__swab64(x) ___arch__swab64(x)
64#define __arch__swab32(x) ___arch__swab32(x)
65
66#define __BYTEORDER_HAS_U64__
67
68#endif /* __GNUC__ */
69
70#include <linux/byteorder/little_endian.h>
71
72#endif /* _ASM_X86_BYTEORDER_H */
73