File: /usr/include/asm/byteorder.h

1     #ifndef _I386_BYTEORDER_H
2     #define _I386_BYTEORDER_H
3     
4     #include <asm/types.h>
5     
6     #ifdef __GNUC__
7     
8     /* For avoiding bswap on i386 */
9     #ifdef __KERNEL__
10     #include <linux/config.h>
11     #endif
12     
13     static __inline__ __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     
27     static __inline__ __const__ __u16 ___arch__swab16(__u16 x)
28     {
29     	__asm__("xchgb %b0,%h0"		/* swap bytes		*/ 
30     		: "=q" (x) 
31     		:  "0" (x)); 
32     		return x;
33     }
34     
35     #define __arch__swab32(x) ___arch__swab32(x)
36     #define __arch__swab16(x) ___arch__swab16(x)
37     
38     #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
39     #  define __BYTEORDER_HAS_U64__
40     #  define __SWAB_64_THRU_32__
41     #endif
42     
43     #endif /* __GNUC__ */
44     
45     #include <linux/byteorder/little_endian.h>
46     
47     #endif /* _I386_BYTEORDER_H */
48