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#ifndef _LINUX_BYTEORDER_SWAB_H |
#define _LINUX_BYTEORDER_SWAB_H |
|
/* |
* linux/byteorder/swab.h |
* Byte-swapping, independently from CPU endianness |
* swabXX[ps]?(foo) |
* |
* Francois-Rene Rideau <fare@tunes.org> 19971205 |
* separated swab functions from cpu_to_XX, |
* to clean up support for bizarre-endian architectures. |
* |
* See asm-i386/byteorder.h and suches for examples of how to provide |
* architecture-dependent optimized versions |
* |
*/ |
|
/* casts are necessary for constants, because we never know how for sure |
* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
*/ |
#define ___swab16(x) \ |
({ \ |
__u16 __x = (x); \ |
((__u16)( \ |
(((__u16)(__x) & (__u16)0x00ffU) << 8) | \ |
(((__u16)(__x) & (__u16)0xff00U) >> 8) )); \ |
}) |
|
#define ___swab32(x) \ |
({ \ |
__u32 __x = (x); \ |
((__u32)( \ |
(((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \ |
(((__u32)(__x) & (__u32)0x0000ff00UL) << 8) | \ |
(((__u32)(__x) & (__u32)0x00ff0000UL) >> 8) | \ |
(((__u32)(__x) & (__u32)0xff000000UL) >> 24) )); \ |
}) |
|
#define ___swab64(x) \ |
({ \ |
__u64 __x = (x); \ |
((__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) )); \ |
}) |
|
#define ___constant_swab16(x) \ |
((__u16)( \ |
(((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
(((__u16)(x) & (__u16)0xff00U) >> 8) )) |
#define ___constant_swab32(x) \ |
((__u32)( \ |
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
(((__u32)(x) & (__u32)0xff000000UL) >> 24) )) |
#define ___constant_swab64(x) \ |
((__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) )) |
|
/* |
* provide defaults when no architecture-specific optimization is detected |
*/ |
#ifndef __arch__swab16 |
# define __arch__swab16(x) ({ __u16 __tmp = (x) ; ___swab16(__tmp); }) |
#endif |
#ifndef __arch__swab32 |
# define __arch__swab32(x) ({ __u32 __tmp = (x) ; ___swab32(__tmp); }) |
#endif |
#ifndef __arch__swab64 |
# define __arch__swab64(x) ({ __u64 __tmp = (x) ; ___swab64(__tmp); }) |
#endif |
|
#ifndef __arch__swab16p |
# define __arch__swab16p(x) __arch__swab16(*(x)) |
#endif |
#ifndef __arch__swab32p |
# define __arch__swab32p(x) __arch__swab32(*(x)) |
#endif |
#ifndef __arch__swab64p |
# define __arch__swab64p(x) __arch__swab64(*(x)) |
#endif |
|
#ifndef __arch__swab16s |
# define __arch__swab16s(x) do { *(x) = __arch__swab16p((x)); } while (0) |
#endif |
#ifndef __arch__swab32s |
# define __arch__swab32s(x) do { *(x) = __arch__swab32p((x)); } while (0) |
#endif |
#ifndef __arch__swab64s |
# define __arch__swab64s(x) do { *(x) = __arch__swab64p((x)); } while (0) |
#endif |
|
|
/* |
* Allow constant folding |
*/ |
#if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) |
# define __swab16(x) \ |
(__builtin_constant_p((__u16)(x)) ? \ |
___swab16((x)) : \ |
__fswab16((x))) |
# define __swab32(x) \ |
(__builtin_constant_p((__u32)(x)) ? \ |
___swab32((x)) : \ |
__fswab32((x))) |
# define __swab64(x) \ |
(__builtin_constant_p((__u64)(x)) ? \ |
___swab64((x)) : \ |
__fswab64((x))) |
#else |
# define __swab16(x) __fswab16(x) |
# define __swab32(x) __fswab32(x) |
# define __swab64(x) __fswab64(x) |
#endif /* OPTIMIZE */ |
|
|
static __inline__ __const__ __u16 __fswab16(__u16 x) |
{ |
return __arch__swab16(x); |
} |
static __inline__ __u16 __swab16p(__u16 *x) |
{ |
return __arch__swab16p(x); |
} |
static __inline__ void __swab16s(__u16 *addr) |
{ |
__arch__swab16s(addr); |
} |
|
static __inline__ __const__ __u32 __fswab32(__u32 x) |
{ |
return __arch__swab32(x); |
} |
static __inline__ __u32 __swab32p(__u32 *x) |
{ |
return __arch__swab32p(x); |
} |
static __inline__ void __swab32s(__u32 *addr) |
{ |
__arch__swab32s(addr); |
} |
|
#ifdef __BYTEORDER_HAS_U64__ |
static __inline__ const __u64 __fswab64(__u64 x) |
{ |
# ifdef __SWAB_64_THRU_32__ |
__u32 h = x >> 32; |
__u32 l = x & ((1ULL<<32)-1); |
return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h))); |
# else |
return __arch__swab64(x); |
# endif |
} |
static __inline__ __u64 __swab64p(__u64 *x) |
{ |
return __arch__swab64p(x); |
} |
static __inline__ void __swab64s(__u64 *addr) |
{ |
__arch__swab64s(addr); |
} |
#endif /* __BYTEORDER_HAS_U64__ */ |
|
#if defined(__KERNEL__) |
#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 |
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#endif /* _LINUX_BYTEORDER_SWAB_H */ |