1#ifndef _I386_BYTEORDER_H
2#define _I386_BYTEORDER_H
3
4#include <asm/types.h>
5#include <linux/compiler.h>
6
7#ifdef __GNUC__
8
9/* For avoiding bswap on i386 */
10#ifdef __KERNEL__
11#endif
12
13static __inline__ __attribute_const__ __u32 ___arch__swab32(__u32 x)
14{
15#ifdef CONFIG_X86_BSWAP
16	__asm__("bswap %0" : "=r" (x) : "0" (x));
17#else
18	__asm__("xchgb %b0,%h0\n\t"	/* swap lower bytes	*/
19		"rorl $16,%0\n\t"	/* swap words		*/
20		"xchgb %b0,%h0"		/* swap higher bytes	*/
21		:"=q" (x)
22		: "0" (x));
23#endif
24	return x;
25}
26
27static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 val)
28{
29	union {
30		struct { __u32 a,b; } s;
31		__u64 u;
32	} v;
33	v.u = val;
34#ifdef CONFIG_X86_BSWAP
35	asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
36	    : "=r" (v.s.a), "=r" (v.s.b)
37	    : "0" (v.s.a), "1" (v.s.b));
38#else
39   v.s.a = ___arch__swab32(v.s.a);
40	v.s.b = ___arch__swab32(v.s.b);
41	asm("xchgl %0,%1" : "=r" (v.s.a), "=r" (v.s.b) : "0" (v.s.a), "1" (v.s.b));
42#endif
43	return v.u;
44}
45
46/* Do not define swab16.  Gcc is smart enough to recognize "C" version and
47   convert it into rotation or exhange.  */
48
49#define __arch__swab64(x) ___arch__swab64(x)
50#define __arch__swab32(x) ___arch__swab32(x)
51
52#define __BYTEORDER_HAS_U64__
53
54#endif /* __GNUC__ */
55
56#include <linux/byteorder/little_endian.h>
57
58#endif /* _I386_BYTEORDER_H */
59