Rev 424 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 424 | giacomo | 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 | /* casts are necessary for constants, because we never know how for sure |
||
| 19 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
||
| 20 | */ |
||
| 21 | #define ___swab16(x) \ |
||
| 22 | ({ \ |
||
| 23 | __u16 __x = (x); \ |
||
| 24 | ((__u16)( \ |
||
| 25 | (((__u16)(__x) & (__u16)0x00ffU) << 8) | \ |
||
| 26 | (((__u16)(__x) & (__u16)0xff00U) >> 8) )); \ |
||
| 27 | }) |
||
| 28 | |||
| 29 | #define ___swab32(x) \ |
||
| 30 | ({ \ |
||
| 31 | __u32 __x = (x); \ |
||
| 32 | ((__u32)( \ |
||
| 33 | (((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \ |
||
| 34 | (((__u32)(__x) & (__u32)0x0000ff00UL) << 8) | \ |
||
| 35 | (((__u32)(__x) & (__u32)0x00ff0000UL) >> 8) | \ |
||
| 36 | (((__u32)(__x) & (__u32)0xff000000UL) >> 24) )); \ |
||
| 37 | }) |
||
| 38 | |||
| 39 | #define ___swab64(x) \ |
||
| 40 | ({ \ |
||
| 41 | __u64 __x = (x); \ |
||
| 42 | ((__u64)( \ |
||
| 43 | (__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \ |
||
| 44 | (__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
||
| 45 | (__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
||
| 46 | (__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
||
| 47 | (__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
||
| 48 | (__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
||
| 49 | (__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
||
| 50 | (__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56) )); \ |
||
| 51 | }) |
||
| 52 | |||
| 53 | #define ___constant_swab16(x) \ |
||
| 54 | ((__u16)( \ |
||
| 55 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
||
| 56 | (((__u16)(x) & (__u16)0xff00U) >> 8) )) |
||
| 57 | #define ___constant_swab32(x) \ |
||
| 58 | ((__u32)( \ |
||
| 59 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
||
| 60 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
||
| 61 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
||
| 62 | (((__u32)(x) & (__u32)0xff000000UL) >> 24) )) |
||
| 63 | #define ___constant_swab64(x) \ |
||
| 64 | ((__u64)( \ |
||
| 65 | (__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ |
||
| 66 | (__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
||
| 67 | (__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
||
| 68 | (__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
||
| 69 | (__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
||
| 70 | (__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
||
| 71 | (__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
||
| 72 | (__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) )) |
||
| 73 | |||
| 74 | /* |
||
| 75 | * provide defaults when no architecture-specific optimization is detected |
||
| 76 | */ |
||
| 77 | #ifndef __arch__swab16 |
||
| 78 | # define __arch__swab16(x) ({ __u16 __tmp = (x) ; ___swab16(__tmp); }) |
||
| 79 | #endif |
||
| 80 | #ifndef __arch__swab32 |
||
| 81 | # define __arch__swab32(x) ({ __u32 __tmp = (x) ; ___swab32(__tmp); }) |
||
| 82 | #endif |
||
| 83 | #ifndef __arch__swab64 |
||
| 84 | # define __arch__swab64(x) ({ __u64 __tmp = (x) ; ___swab64(__tmp); }) |
||
| 85 | #endif |
||
| 86 | |||
| 87 | #ifndef __arch__swab16p |
||
| 88 | # define __arch__swab16p(x) __arch__swab16(*(x)) |
||
| 89 | #endif |
||
| 90 | #ifndef __arch__swab32p |
||
| 91 | # define __arch__swab32p(x) __arch__swab32(*(x)) |
||
| 92 | #endif |
||
| 93 | #ifndef __arch__swab64p |
||
| 94 | # define __arch__swab64p(x) __arch__swab64(*(x)) |
||
| 95 | #endif |
||
| 96 | |||
| 97 | #ifndef __arch__swab16s |
||
| 98 | # define __arch__swab16s(x) do { *(x) = __arch__swab16p((x)); } while (0) |
||
| 99 | #endif |
||
| 100 | #ifndef __arch__swab32s |
||
| 101 | # define __arch__swab32s(x) do { *(x) = __arch__swab32p((x)); } while (0) |
||
| 102 | #endif |
||
| 103 | #ifndef __arch__swab64s |
||
| 104 | # define __arch__swab64s(x) do { *(x) = __arch__swab64p((x)); } while (0) |
||
| 105 | #endif |
||
| 106 | |||
| 107 | |||
| 108 | /* |
||
| 109 | * Allow constant folding |
||
| 110 | */ |
||
| 111 | #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) |
||
| 112 | # define __swab16(x) \ |
||
| 113 | (__builtin_constant_p((__u16)(x)) ? \ |
||
| 114 | ___swab16((x)) : \ |
||
| 115 | __fswab16((x))) |
||
| 116 | # define __swab32(x) \ |
||
| 117 | (__builtin_constant_p((__u32)(x)) ? \ |
||
| 118 | ___swab32((x)) : \ |
||
| 119 | __fswab32((x))) |
||
| 120 | # define __swab64(x) \ |
||
| 121 | (__builtin_constant_p((__u64)(x)) ? \ |
||
| 122 | ___swab64((x)) : \ |
||
| 123 | __fswab64((x))) |
||
| 124 | #else |
||
| 125 | # define __swab16(x) __fswab16(x) |
||
| 126 | # define __swab32(x) __fswab32(x) |
||
| 127 | # define __swab64(x) __fswab64(x) |
||
| 128 | #endif /* OPTIMIZE */ |
||
| 129 | |||
| 130 | |||
| 1056 | tullio | 131 | static __inline__ __attribute__((const)) __u16 __fswab16(__u16 x) |
| 424 | giacomo | 132 | { |
| 133 | return __arch__swab16(x); |
||
| 134 | } |
||
| 135 | static __inline__ __u16 __swab16p(__u16 *x) |
||
| 136 | { |
||
| 137 | return __arch__swab16p(x); |
||
| 138 | } |
||
| 139 | static __inline__ void __swab16s(__u16 *addr) |
||
| 140 | { |
||
| 141 | __arch__swab16s(addr); |
||
| 142 | } |
||
| 143 | |||
| 1056 | tullio | 144 | static __inline__ __attribute__((const)) __u32 __fswab32(__u32 x) |
| 424 | giacomo | 145 | { |
| 146 | return __arch__swab32(x); |
||
| 147 | } |
||
| 148 | static __inline__ __u32 __swab32p(__u32 *x) |
||
| 149 | { |
||
| 150 | return __arch__swab32p(x); |
||
| 151 | } |
||
| 152 | static __inline__ void __swab32s(__u32 *addr) |
||
| 153 | { |
||
| 154 | __arch__swab32s(addr); |
||
| 155 | } |
||
| 156 | |||
| 157 | #ifdef __BYTEORDER_HAS_U64__ |
||
| 1056 | tullio | 158 | static __inline__ __attribute__((const)) __u64 __fswab64(__u64 x) |
| 424 | giacomo | 159 | { |
| 160 | # ifdef __SWAB_64_THRU_32__ |
||
| 161 | __u32 h = x >> 32; |
||
| 162 | __u32 l = x & ((1ULL<<32)-1); |
||
| 163 | return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h))); |
||
| 164 | # else |
||
| 165 | return __arch__swab64(x); |
||
| 166 | # endif |
||
| 167 | } |
||
| 168 | static __inline__ __u64 __swab64p(__u64 *x) |
||
| 169 | { |
||
| 170 | return __arch__swab64p(x); |
||
| 171 | } |
||
| 172 | static __inline__ void __swab64s(__u64 *addr) |
||
| 173 | { |
||
| 174 | __arch__swab64s(addr); |
||
| 175 | } |
||
| 176 | #endif /* __BYTEORDER_HAS_U64__ */ |
||
| 177 | |||
| 178 | #if defined(__KERNEL__) |
||
| 179 | #define swab16 __swab16 |
||
| 180 | #define swab32 __swab32 |
||
| 181 | #define swab64 __swab64 |
||
| 182 | #define swab16p __swab16p |
||
| 183 | #define swab32p __swab32p |
||
| 184 | #define swab64p __swab64p |
||
| 185 | #define swab16s __swab16s |
||
| 186 | #define swab32s __swab32s |
||
| 187 | #define swab64s __swab64s |
||
| 188 | #endif |
||
| 189 | |||
| 190 | #endif /* _LINUX_BYTEORDER_SWAB_H */ |