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| Rev | Author | Line No. | Line |
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| 424 | giacomo | 1 | #ifndef _LINUX_BYTEORDER_SWAB_H |
| 2 | #define _LINUX_BYTEORDER_SWAB_H |
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| 3 | |||
| 4 | /* |
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| 5 | * linux/byteorder/swab.h |
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| 6 | * Byte-swapping, independently from CPU endianness |
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| 7 | * swabXX[ps]?(foo) |
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| 8 | * |
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| 9 | * Francois-Rene Rideau <fare@tunes.org> 19971205 |
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| 10 | * separated swab functions from cpu_to_XX, |
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| 11 | * to clean up support for bizarre-endian architectures. |
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| 12 | * |
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| 13 | * See asm-i386/byteorder.h and suches for examples of how to provide |
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| 14 | * architecture-dependent optimized versions |
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| 15 | * |
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| 16 | */ |
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| 17 | |||
| 18 | /* casts are necessary for constants, because we never know how for sure |
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| 19 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
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| 20 | */ |
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| 21 | #define ___swab16(x) \ |
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| 22 | ({ \ |
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| 23 | __u16 __x = (x); \ |
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| 24 | ((__u16)( \ |
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| 25 | (((__u16)(__x) & (__u16)0x00ffU) << 8) | \ |
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| 26 | (((__u16)(__x) & (__u16)0xff00U) >> 8) )); \ |
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| 27 | }) |
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| 28 | |||
| 29 | #define ___swab32(x) \ |
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| 30 | ({ \ |
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| 31 | __u32 __x = (x); \ |
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| 32 | ((__u32)( \ |
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| 33 | (((__u32)(__x) & (__u32)0x000000ffUL) << 24) | \ |
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| 34 | (((__u32)(__x) & (__u32)0x0000ff00UL) << 8) | \ |
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| 35 | (((__u32)(__x) & (__u32)0x00ff0000UL) >> 8) | \ |
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| 36 | (((__u32)(__x) & (__u32)0xff000000UL) >> 24) )); \ |
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| 37 | }) |
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| 38 | |||
| 39 | #define ___swab64(x) \ |
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| 40 | ({ \ |
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| 41 | __u64 __x = (x); \ |
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| 42 | ((__u64)( \ |
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| 43 | (__u64)(((__u64)(__x) & (__u64)0x00000000000000ffULL) << 56) | \ |
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| 44 | (__u64)(((__u64)(__x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
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| 45 | (__u64)(((__u64)(__x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
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| 46 | (__u64)(((__u64)(__x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
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| 47 | (__u64)(((__u64)(__x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
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| 48 | (__u64)(((__u64)(__x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
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| 49 | (__u64)(((__u64)(__x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
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| 50 | (__u64)(((__u64)(__x) & (__u64)0xff00000000000000ULL) >> 56) )); \ |
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| 51 | }) |
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| 52 | |||
| 53 | #define ___constant_swab16(x) \ |
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| 54 | ((__u16)( \ |
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| 55 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
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| 56 | (((__u16)(x) & (__u16)0xff00U) >> 8) )) |
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| 57 | #define ___constant_swab32(x) \ |
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| 58 | ((__u32)( \ |
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| 59 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
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| 60 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
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| 61 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
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| 62 | (((__u32)(x) & (__u32)0xff000000UL) >> 24) )) |
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| 63 | #define ___constant_swab64(x) \ |
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| 64 | ((__u64)( \ |
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| 65 | (__u64)(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ |
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| 66 | (__u64)(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
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| 67 | (__u64)(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
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| 68 | (__u64)(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
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| 69 | (__u64)(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
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| 70 | (__u64)(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
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| 71 | (__u64)(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
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| 72 | (__u64)(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56) )) |
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| 73 | |||
| 74 | /* |
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| 75 | * provide defaults when no architecture-specific optimization is detected |
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| 76 | */ |
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| 77 | #ifndef __arch__swab16 |
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| 78 | # define __arch__swab16(x) ({ __u16 __tmp = (x) ; ___swab16(__tmp); }) |
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| 79 | #endif |
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| 80 | #ifndef __arch__swab32 |
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| 81 | # define __arch__swab32(x) ({ __u32 __tmp = (x) ; ___swab32(__tmp); }) |
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| 82 | #endif |
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| 83 | #ifndef __arch__swab64 |
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| 84 | # define __arch__swab64(x) ({ __u64 __tmp = (x) ; ___swab64(__tmp); }) |
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| 85 | #endif |
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| 86 | |||
| 87 | #ifndef __arch__swab16p |
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| 88 | # define __arch__swab16p(x) __arch__swab16(*(x)) |
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| 89 | #endif |
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| 90 | #ifndef __arch__swab32p |
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| 91 | # define __arch__swab32p(x) __arch__swab32(*(x)) |
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| 92 | #endif |
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| 93 | #ifndef __arch__swab64p |
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| 94 | # define __arch__swab64p(x) __arch__swab64(*(x)) |
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| 95 | #endif |
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| 96 | |||
| 97 | #ifndef __arch__swab16s |
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| 98 | # define __arch__swab16s(x) do { *(x) = __arch__swab16p((x)); } while (0) |
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| 99 | #endif |
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| 100 | #ifndef __arch__swab32s |
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| 101 | # define __arch__swab32s(x) do { *(x) = __arch__swab32p((x)); } while (0) |
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| 102 | #endif |
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| 103 | #ifndef __arch__swab64s |
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| 104 | # define __arch__swab64s(x) do { *(x) = __arch__swab64p((x)); } while (0) |
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| 105 | #endif |
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| 106 | |||
| 107 | |||
| 108 | /* |
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| 109 | * Allow constant folding |
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| 110 | */ |
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| 111 | #if defined(__GNUC__) && (__GNUC__ >= 2) && defined(__OPTIMIZE__) |
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| 112 | # define __swab16(x) \ |
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| 113 | (__builtin_constant_p((__u16)(x)) ? \ |
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| 114 | ___swab16((x)) : \ |
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| 115 | __fswab16((x))) |
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| 116 | # define __swab32(x) \ |
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| 117 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 118 | ___swab32((x)) : \ |
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| 119 | __fswab32((x))) |
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| 120 | # define __swab64(x) \ |
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| 121 | (__builtin_constant_p((__u64)(x)) ? \ |
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| 122 | ___swab64((x)) : \ |
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| 123 | __fswab64((x))) |
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| 124 | #else |
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| 125 | # define __swab16(x) __fswab16(x) |
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| 126 | # define __swab32(x) __fswab32(x) |
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| 127 | # define __swab64(x) __fswab64(x) |
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| 128 | #endif /* OPTIMIZE */ |
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| 129 | |||
| 130 | |||
| 131 | static __inline__ __const__ __u16 __fswab16(__u16 x) |
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| 132 | { |
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| 133 | return __arch__swab16(x); |
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| 134 | } |
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| 135 | static __inline__ __u16 __swab16p(__u16 *x) |
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| 136 | { |
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| 137 | return __arch__swab16p(x); |
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| 138 | } |
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| 139 | static __inline__ void __swab16s(__u16 *addr) |
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| 140 | { |
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| 141 | __arch__swab16s(addr); |
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| 142 | } |
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| 143 | |||
| 144 | static __inline__ __const__ __u32 __fswab32(__u32 x) |
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| 145 | { |
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| 146 | return __arch__swab32(x); |
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| 147 | } |
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| 148 | static __inline__ __u32 __swab32p(__u32 *x) |
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| 149 | { |
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| 150 | return __arch__swab32p(x); |
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| 151 | } |
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| 152 | static __inline__ void __swab32s(__u32 *addr) |
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| 153 | { |
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| 154 | __arch__swab32s(addr); |
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| 155 | } |
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| 156 | |||
| 157 | #ifdef __BYTEORDER_HAS_U64__ |
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| 158 | static __inline__ __const__ __u64 __fswab64(__u64 x) |
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| 159 | { |
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| 160 | # ifdef __SWAB_64_THRU_32__ |
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| 161 | __u32 h = x >> 32; |
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| 162 | __u32 l = x & ((1ULL<<32)-1); |
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| 163 | return (((__u64)__swab32(l)) << 32) | ((__u64)(__swab32(h))); |
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| 164 | # else |
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| 165 | return __arch__swab64(x); |
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| 166 | # endif |
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| 167 | } |
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| 168 | static __inline__ __u64 __swab64p(__u64 *x) |
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| 169 | { |
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| 170 | return __arch__swab64p(x); |
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| 171 | } |
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| 172 | static __inline__ void __swab64s(__u64 *addr) |
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| 173 | { |
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| 174 | __arch__swab64s(addr); |
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| 175 | } |
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| 176 | #endif /* __BYTEORDER_HAS_U64__ */ |
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| 177 | |||
| 178 | #if defined(__KERNEL__) |
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| 179 | #define swab16 __swab16 |
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| 180 | #define swab32 __swab32 |
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| 181 | #define swab64 __swab64 |
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| 182 | #define swab16p __swab16p |
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| 183 | #define swab32p __swab32p |
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| 184 | #define swab64p __swab64p |
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| 185 | #define swab16s __swab16s |
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| 186 | #define swab32s __swab32s |
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| 187 | #define swab64s __swab64s |
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| 188 | #endif |
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| 189 | |||
| 190 | #endif /* _LINUX_BYTEORDER_SWAB_H */ |