1. 根目录:
2. drivers
3. staging
4. rtl8712
5. swab.h

#ifndef _LINUX_BYTEORDER_SWAB_H
#define _LINUX_BYTEORDER_SWAB_H

#ifndef __u16
 #define __u16 unsigned short
#endif

#ifndef __u32
 #define __u32 unsigned int
#endif

#ifndef __u8
 #define __u8 unsigned char
#endif

#ifndef __u64
 #define __u64 unsigned long long
#endif


static inline __u16  ___swab16(__u16 x)
{
	__u16 __x = x;
	return (__u16)(
		(((__u16)(__x) & (__u16)0x00ffU) << 8) |
		(((__u16)(__x) & (__u16)0xff00U) >> 8));

}

static inline __u32  ___swab32(__u32 x)
{
	__u32 __x = (x);
	return (__u32)(
		(((__u32)(__x) & (__u32)0x000000ffUL) << 24) |
		(((__u32)(__x) & (__u32)0x0000ff00UL) <<  8) |
		(((__u32)(__x) & (__u32)0x00ff0000UL) >>  8) |
		(((__u32)(__x) & (__u32)0xff000000UL) >> 24));
}

static inline __u64  ___swab64(__u64 x)
{
	__u64 __x = (x);

	return (__u64)( \
		(__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \
		(__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \
		(__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \
		(__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) <<  8) | \
		(__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >>  8) | \
		(__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
		(__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \
		(__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56));
}

#ifndef __arch__swab16
static inline __u16 __arch__swab16(__u16 x)
{
	return ___swab16(x);
}

#endif

#ifndef __arch__swab32
static inline __u32 __arch__swab32(__u32 x)
{
	__u32 __tmp = (x) ;
	return ___swab32(__tmp);
}
#endif

#ifndef __arch__swab64

static inline __u64 __arch__swab64(__u64 x)
{
	__u64 __tmp = (x) ;
	return ___swab64(__tmp);
}


#endif

#define __swab16(x) __fswab16(x)
#define __swab32(x) __fswab32(x)
#define __swab64(x) __fswab64(x)

static inline const __u16 __fswab16(__u16 x)
{
	return __arch__swab16(x);
}
static inline const __u32 __fswab32(__u32 x)
{
	return __arch__swab32(x);
}

#define swab16 __swab16
#define swab32 __swab32
#define swab64 __swab64
#define swab16p __swab16p
#define swab32p __swab32p
#define swab64p __swab64p
#define swab16s __swab16s
#define swab32s __swab32s
#define swab64s __swab64s

#endif /* _LINUX_BYTEORDER_SWAB_H */