LCOV - code coverage report
Current view: directory - usr/include/linux/byteorder - swab.h (source / functions) Found Hit Coverage
Test: app.info Lines: 6 0 0.0 %
Date: 2012-06-02 Functions: 3 0 0.0 %

       1                 : #ifndef _LINUX_BYTEORDER_SWAB_H
       2                 : #define _LINUX_BYTEORDER_SWAB_H
       3                 : 
       4                 : /*
       5                 :  * linux/byteorder/swab.h
       6                 :  * Byte-swapping, independently from CPU endianness
       7                 :  *      swabXX[ps]?(foo)
       8                 :  *
       9                 :  * Francois-Rene Rideau <fare@tunes.org> 19971205
      10                 :  *    separated swab functions from cpu_to_XX,
      11                 :  *    to clean up support for bizarre-endian architectures.
      12                 :  *
      13                 :  * See asm-i386/byteorder.h and suches for examples of how to provide
      14                 :  * architecture-dependent optimized versions
      15                 :  *
      16                 :  */
      17                 : 
      18                 : 
      19                 : /* casts are necessary for constants, because we never know how for sure
      20                 :  * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
      21                 :  */
      22                 : #define ___swab16(x) \
      23                 : ({ \
      24                 :         __u16 __x = (x); \
      25                 :         ((__u16)( \
      26                 :                 (((__u16)(__x) & (__u16)0x00ffU) << 8) | \
      27                 :                 (((__u16)(__x) & (__u16)0xff00U) >> 8) )); \
      28                 : })
      29                 : 
      30                 : #define ___swab32(x) \
      31                 : ({ \
      32                 :         __u32 __x = (x); \
      33                 :         ((__u32)( \
      34                 :                 (((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \
      35                 :                 (((__u32)(__x) & (__u32)0x0000ff00UL) <<  8) | \
      36                 :                 (((__u32)(__x) & (__u32)0x00ff0000UL) >>  8) | \
      37                 :                 (((__u32)(__x) & (__u32)0xff000000UL) >> 24) )); \
      38                 : })
      39                 : 
      40                 : #define ___swab64(x) \
      41                 : ({ \
      42                 :         __u64 __x = (x); \
      43                 :         ((__u64)( \
      44                 :                 (__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \
      45                 :                 (__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \
      46                 :                 (__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \
      47                 :                 (__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) <<  8) | \
      48                 :                 (__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >>  8) | \
      49                 :                 (__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
      50                 :                 (__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \
      51                 :                 (__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56) )); \
      52                 : })
      53                 : 
      54                 : #define ___constant_swab16(x) \
      55                 :         ((__u16)( \
      56                 :                 (((__u16)(x) & (__u16)0x00ffU) << 8) | \
      57                 :                 (((__u16)(x) & (__u16)0xff00U) >> 8) ))
      58                 : #define ___constant_swab32(x) \
      59                 :         ((__u32)( \
      60                 :                 (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
      61                 :                 (((__u32)(x) & (__u32)0x0000ff00UL) <<  8) | \
      62                 :                 (((__u32)(x) & (__u32)0x00ff0000UL) >>  8) | \
      63                 :                 (((__u32)(x) & (__u32)0xff000000UL) >> 24) ))
      64                 : #define ___constant_swab64(x) \
      65                 :         ((__u64)( \
      66                 :                 (__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
      67                 :                 (__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
      68                 :                 (__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
      69                 :                 (__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) <<  8) | \
      70                 :                 (__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >>  8) | \
      71                 :                 (__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
      72                 :                 (__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
      73                 :                 (__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) ))
      74                 : 
      75                 : /*
      76                 :  * provide defaults when no architecture-specific optimization is detected
      77                 :  */
      78                 : #ifndef __arch__swab16
      79                 : #  define __arch__swab16(x) ({ __u16 __tmp = (x) ; ___swab16(__tmp); })
      80                 : #endif
      81                 : #ifndef __arch__swab32
      82                 : #  define __arch__swab32(x) ({ __u32 __tmp = (x) ; ___swab32(__tmp); })
      83                 : #endif
      84                 : #ifndef __arch__swab64
      85                 : #  define __arch__swab64(x) ({ __u64 __tmp = (x) ; ___swab64(__tmp); })
      86                 : #endif
      87                 : 
      88                 : #ifndef __arch__swab16p
      89                 : #  define __arch__swab16p(x) __arch__swab16(*(x))
      90                 : #endif
      91                 : #ifndef __arch__swab32p
      92                 : #  define __arch__swab32p(x) __arch__swab32(*(x))
      93                 : #endif
      94                 : #ifndef __arch__swab64p
      95                 : #  define __arch__swab64p(x) __arch__swab64(*(x))
      96                 : #endif
      97                 : 
      98                 : #ifndef __arch__swab16s
      99                 : #  define __arch__swab16s(x) do { *(x) = __arch__swab16p((x)); } while (0)
     100                 : #endif
     101                 : #ifndef __arch__swab32s
     102                 : #  define __arch__swab32s(x) do { *(x) = __arch__swab32p((x)); } while (0)
     103                 : #endif
     104                 : #ifndef __arch__swab64s
     105                 : #  define __arch__swab64s(x) do { *(x) = __arch__swab64p((x)); } while (0)
     106                 : #endif
     107                 : 
     108                 : 
     109                 : /*
     110                 :  * Allow constant folding
     111                 :  */
     112                 : #if defined(__GNUC__) && defined(__OPTIMIZE__)
     113                 : #  define __swab16(x) \
     114                 : (__builtin_constant_p((__u16)(x)) ? \
     115                 :  ___swab16((x)) : \
     116                 :  __fswab16((x)))
     117                 : #  define __swab32(x) \
     118                 : (__builtin_constant_p((__u32)(x)) ? \
     119                 :  ___swab32((x)) : \
     120                 :  __fswab32((x)))
     121                 : #  define __swab64(x) \
     122                 : (__builtin_constant_p((__u64)(x)) ? \
     123                 :  ___swab64((x)) : \
     124                 :  __fswab64((x)))
     125                 : #else
     126                 : #  define __swab16(x) __fswab16(x)
     127                 : #  define __swab32(x) __fswab32(x)
     128                 : #  define __swab64(x) __fswab64(x)
     129                 : #endif /* OPTIMIZE */
     130                 : 
     131                 : 
     132               0 : static __inline__ __u16 __fswab16(__u16 x)
     133                 : {
     134               0 :         return __arch__swab16(x);
     135                 : }
     136                 : static __inline__ __u16 __swab16p(const __u16 *x)
     137                 : {
     138                 :         return __arch__swab16p(x);
     139                 : }
     140                 : static __inline__ void __swab16s(__u16 *addr)
     141                 : {
     142                 :         __arch__swab16s(addr);
     143                 : }
     144                 : 
     145               0 : static __inline__ __u32 __fswab32(__u32 x)
     146                 : {
     147               0 :         return __arch__swab32(x);
     148                 : }
     149                 : static __inline__ __u32 __swab32p(const __u32 *x)
     150                 : {
     151                 :         return __arch__swab32p(x);
     152                 : }
     153                 : static __inline__ void __swab32s(__u32 *addr)
     154                 : {
     155                 :         __arch__swab32s(addr);
     156                 : }
     157                 : 
     158                 : #ifdef __BYTEORDER_HAS_U64__
     159               0 : static __inline__ __u64 __fswab64(__u64 x)
     160                 : {
     161                 : #  ifdef __SWAB_64_THRU_32__
     162                 :         __u32 h = x >> 32;
     163                 :         __u32 l = x & ((1ULL<<32)-1);
     164                 :         return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h)));
     165                 : #  else
     166               0 :         return __arch__swab64(x);
     167                 : #  endif
     168                 : }
     169                 : static __inline__ __u64 __swab64p(const __u64 *x)
     170                 : {
     171                 :         return __arch__swab64p(x);
     172                 : }
     173                 : static __inline__ void __swab64s(__u64 *addr)
     174                 : {
     175                 :         __arch__swab64s(addr);
     176                 : }
     177                 : #endif /* __BYTEORDER_HAS_U64__ */
     178                 : 
     179                 : 
     180                 : #endif /* _LINUX_BYTEORDER_SWAB_H */

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