byteorder.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:1k
- #ifndef _I386_BYTEORDER_H
- #define _I386_BYTEORDER_H
- #include <asm/types.h>
- #ifdef __GNUC__
- /* For avoiding bswap on i386 */
- #ifdef __KERNEL__
- #include <linux/config.h>
- #endif
- static __inline__ __const__ __u32 ___arch__swab32(__u32 x)
- {
- #ifdef CONFIG_X86_BSWAP
- __asm__("bswap %0" : "=r" (x) : "0" (x));
- #else
- __asm__("xchgb %b0,%h0nt" /* swap lower bytes */
- "rorl $16,%0nt" /* swap words */
- "xchgb %b0,%h0" /* swap higher bytes */
- :"=q" (x)
- : "0" (x));
- #endif
- return x;
- }
- static __inline__ __const__ __u16 ___arch__swab16(__u16 x)
- {
- __asm__("xchgb %b0,%h0" /* swap bytes */
- : "=q" (x)
- : "0" (x));
- return x;
- }
- #define __arch__swab32(x) ___arch__swab32(x)
- #define __arch__swab16(x) ___arch__swab16(x)
- #if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
- # define __BYTEORDER_HAS_U64__
- # define __SWAB_64_THRU_32__
- #endif
- #endif /* __GNUC__ */
- #include <linux/byteorder/little_endian.h>
- #endif /* _I386_BYTEORDER_H */