mirror of
https://github.com/reactos/reactos.git
synced 2024-10-30 03:27:31 +00:00
193 lines
5.3 KiB
C
193 lines
5.3 KiB
C
#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
|
|
*
|
|
*/
|
|
|
|
#include "compiler.h"
|
|
|
|
/* 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__ __attribute_const__ __u16 __fswab16(__u16 x)
|
|
{
|
|
return __arch__swab16(x);
|
|
}
|
|
static __inline__ __u16 __swab16p(const __u16 *x)
|
|
{
|
|
return __arch__swab16p(x);
|
|
}
|
|
static __inline__ void __swab16s(__u16 *addr)
|
|
{
|
|
__arch__swab16s(addr);
|
|
}
|
|
|
|
static __inline__ __attribute_const__ __u32 __fswab32(__u32 x)
|
|
{
|
|
return __arch__swab32(x);
|
|
}
|
|
static __inline__ __u32 __swab32p(const __u32 *x)
|
|
{
|
|
return __arch__swab32p(x);
|
|
}
|
|
static __inline__ void __swab32s(__u32 *addr)
|
|
{
|
|
__arch__swab32s(addr);
|
|
}
|
|
|
|
#ifdef __BYTEORDER_HAS_U64__
|
|
static __inline__ __attribute_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(const __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
|
|
|
|
#endif /* _LINUX_BYTEORDER_SWAB_H */
|