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| Rev | Author | Line No. | Line |
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| 6082 | serge | 1 | #ifndef _UAPI_LINUX_SWAB_H |
| 2 | #define _UAPI_LINUX_SWAB_H |
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| 3 | |||
| 4 | #include |
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| 5 | #include |
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| 6 | #include |
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| 7 | |||
| 8 | /* |
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| 9 | * casts are necessary for constants, because we never know how for sure |
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| 10 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
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| 11 | */ |
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| 12 | #define ___constant_swab16(x) ((__u16)( \ |
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| 13 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
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| 14 | (((__u16)(x) & (__u16)0xff00U) >> 8))) |
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| 15 | |||
| 16 | #define ___constant_swab32(x) ((__u32)( \ |
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| 17 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
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| 18 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
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| 19 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
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| 20 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) |
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| 21 | |||
| 22 | #define ___constant_swab64(x) ((__u64)( \ |
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| 23 | (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ |
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| 24 | (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
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| 25 | (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
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| 26 | (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
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| 27 | (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
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| 28 | (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
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| 29 | (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
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| 30 | (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) |
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| 31 | |||
| 32 | #define ___constant_swahw32(x) ((__u32)( \ |
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| 33 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ |
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| 34 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) |
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| 35 | |||
| 36 | #define ___constant_swahb32(x) ((__u32)( \ |
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| 37 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ |
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| 38 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) |
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| 39 | |||
| 40 | /* |
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| 41 | * Implement the following as inlines, but define the interface using |
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| 42 | * macros to allow constant folding when possible: |
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| 43 | * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 |
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| 44 | */ |
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| 45 | |||
| 46 | static inline __attribute_const__ __u16 __fswab16(__u16 val) |
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| 47 | { |
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| 48 | #ifdef __HAVE_BUILTIN_BSWAP16__ |
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| 49 | return __builtin_bswap16(val); |
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| 50 | #elif defined (__arch_swab16) |
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| 51 | return __arch_swab16(val); |
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| 52 | #else |
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| 53 | return ___constant_swab16(val); |
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| 54 | #endif |
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| 55 | } |
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| 56 | |||
| 57 | static inline __attribute_const__ __u32 __fswab32(__u32 val) |
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| 58 | { |
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| 59 | #ifdef __HAVE_BUILTIN_BSWAP32__ |
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| 60 | return __builtin_bswap32(val); |
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| 61 | #elif defined(__arch_swab32) |
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| 62 | return __arch_swab32(val); |
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| 63 | #else |
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| 64 | return ___constant_swab32(val); |
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| 65 | #endif |
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| 66 | } |
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| 67 | |||
| 68 | static inline __attribute_const__ __u64 __fswab64(__u64 val) |
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| 69 | { |
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| 70 | #ifdef __HAVE_BUILTIN_BSWAP64__ |
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| 71 | return __builtin_bswap64(val); |
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| 72 | #elif defined (__arch_swab64) |
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| 73 | return __arch_swab64(val); |
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| 74 | #elif defined(__SWAB_64_THRU_32__) |
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| 75 | __u32 h = val >> 32; |
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| 76 | __u32 l = val & ((1ULL << 32) - 1); |
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| 77 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); |
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| 78 | #else |
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| 79 | return ___constant_swab64(val); |
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| 80 | #endif |
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| 81 | } |
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| 82 | |||
| 83 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) |
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| 84 | { |
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| 85 | #ifdef __arch_swahw32 |
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| 86 | return __arch_swahw32(val); |
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| 87 | #else |
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| 88 | return ___constant_swahw32(val); |
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| 89 | #endif |
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| 90 | } |
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| 91 | |||
| 92 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) |
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| 93 | { |
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| 94 | #ifdef __arch_swahb32 |
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| 95 | return __arch_swahb32(val); |
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| 96 | #else |
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| 97 | return ___constant_swahb32(val); |
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| 98 | #endif |
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| 99 | } |
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| 100 | |||
| 101 | /** |
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| 102 | * __swab16 - return a byteswapped 16-bit value |
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| 103 | * @x: value to byteswap |
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| 104 | */ |
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| 105 | #define __swab16(x) \ |
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| 106 | (__builtin_constant_p((__u16)(x)) ? \ |
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| 107 | ___constant_swab16(x) : \ |
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| 108 | __fswab16(x)) |
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| 109 | |||
| 110 | /** |
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| 111 | * __swab32 - return a byteswapped 32-bit value |
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| 112 | * @x: value to byteswap |
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| 113 | */ |
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| 114 | #define __swab32(x) \ |
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| 115 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 116 | ___constant_swab32(x) : \ |
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| 117 | __fswab32(x)) |
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| 118 | |||
| 119 | /** |
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| 120 | * __swab64 - return a byteswapped 64-bit value |
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| 121 | * @x: value to byteswap |
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| 122 | */ |
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| 123 | #define __swab64(x) \ |
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| 124 | (__builtin_constant_p((__u64)(x)) ? \ |
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| 125 | ___constant_swab64(x) : \ |
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| 126 | __fswab64(x)) |
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| 127 | |||
| 128 | /** |
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| 129 | * __swahw32 - return a word-swapped 32-bit value |
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| 130 | * @x: value to wordswap |
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| 131 | * |
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| 132 | * __swahw32(0x12340000) is 0x00001234 |
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| 133 | */ |
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| 134 | #define __swahw32(x) \ |
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| 135 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 136 | ___constant_swahw32(x) : \ |
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| 137 | __fswahw32(x)) |
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| 138 | |||
| 139 | /** |
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| 140 | * __swahb32 - return a high and low byte-swapped 32-bit value |
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| 141 | * @x: value to byteswap |
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| 142 | * |
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| 143 | * __swahb32(0x12345678) is 0x34127856 |
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| 144 | */ |
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| 145 | #define __swahb32(x) \ |
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| 146 | (__builtin_constant_p((__u32)(x)) ? \ |
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| 147 | ___constant_swahb32(x) : \ |
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| 148 | __fswahb32(x)) |
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| 149 | |||
| 150 | /** |
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| 151 | * __swab16p - return a byteswapped 16-bit value from a pointer |
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| 152 | * @p: pointer to a naturally-aligned 16-bit value |
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| 153 | */ |
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| 154 | static inline __u16 __swab16p(const __u16 *p) |
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| 155 | { |
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| 156 | #ifdef __arch_swab16p |
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| 157 | return __arch_swab16p(p); |
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| 158 | #else |
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| 159 | return __swab16(*p); |
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| 160 | #endif |
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| 161 | } |
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| 162 | |||
| 163 | /** |
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| 164 | * __swab32p - return a byteswapped 32-bit value from a pointer |
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| 165 | * @p: pointer to a naturally-aligned 32-bit value |
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| 166 | */ |
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| 167 | static inline __u32 __swab32p(const __u32 *p) |
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| 168 | { |
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| 169 | #ifdef __arch_swab32p |
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| 170 | return __arch_swab32p(p); |
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| 171 | #else |
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| 172 | return __swab32(*p); |
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| 173 | #endif |
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| 174 | } |
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| 175 | |||
| 176 | /** |
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| 177 | * __swab64p - return a byteswapped 64-bit value from a pointer |
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| 178 | * @p: pointer to a naturally-aligned 64-bit value |
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| 179 | */ |
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| 180 | static inline __u64 __swab64p(const __u64 *p) |
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| 181 | { |
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| 182 | #ifdef __arch_swab64p |
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| 183 | return __arch_swab64p(p); |
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| 184 | #else |
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| 185 | return __swab64(*p); |
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| 186 | #endif |
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| 187 | } |
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| 188 | |||
| 189 | /** |
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| 190 | * __swahw32p - return a wordswapped 32-bit value from a pointer |
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| 191 | * @p: pointer to a naturally-aligned 32-bit value |
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| 192 | * |
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| 193 | * See __swahw32() for details of wordswapping. |
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| 194 | */ |
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| 195 | static inline __u32 __swahw32p(const __u32 *p) |
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| 196 | { |
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| 197 | #ifdef __arch_swahw32p |
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| 198 | return __arch_swahw32p(p); |
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| 199 | #else |
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| 200 | return __swahw32(*p); |
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| 201 | #endif |
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| 202 | } |
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| 203 | |||
| 204 | /** |
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| 205 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer |
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| 206 | * @p: pointer to a naturally-aligned 32-bit value |
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| 207 | * |
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| 208 | * See __swahb32() for details of high/low byteswapping. |
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| 209 | */ |
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| 210 | static inline __u32 __swahb32p(const __u32 *p) |
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| 211 | { |
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| 212 | #ifdef __arch_swahb32p |
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| 213 | return __arch_swahb32p(p); |
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| 214 | #else |
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| 215 | return __swahb32(*p); |
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| 216 | #endif |
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| 217 | } |
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| 218 | |||
| 219 | /** |
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| 220 | * __swab16s - byteswap a 16-bit value in-place |
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| 221 | * @p: pointer to a naturally-aligned 16-bit value |
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| 222 | */ |
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| 223 | static inline void __swab16s(__u16 *p) |
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| 224 | { |
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| 225 | #ifdef __arch_swab16s |
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| 226 | __arch_swab16s(p); |
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| 227 | #else |
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| 228 | *p = __swab16p(p); |
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| 229 | #endif |
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| 230 | } |
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| 231 | /** |
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| 232 | * __swab32s - byteswap a 32-bit value in-place |
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| 233 | * @p: pointer to a naturally-aligned 32-bit value |
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| 234 | */ |
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| 235 | static inline void __swab32s(__u32 *p) |
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| 236 | { |
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| 237 | #ifdef __arch_swab32s |
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| 238 | __arch_swab32s(p); |
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| 239 | #else |
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| 240 | *p = __swab32p(p); |
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| 241 | #endif |
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| 242 | } |
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| 243 | |||
| 244 | /** |
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| 245 | * __swab64s - byteswap a 64-bit value in-place |
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| 246 | * @p: pointer to a naturally-aligned 64-bit value |
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| 247 | */ |
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| 248 | static inline void __swab64s(__u64 *p) |
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| 249 | { |
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| 250 | #ifdef __arch_swab64s |
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| 251 | __arch_swab64s(p); |
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| 252 | #else |
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| 253 | *p = __swab64p(p); |
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| 254 | #endif |
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| 255 | } |
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| 256 | |||
| 257 | /** |
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| 258 | * __swahw32s - wordswap a 32-bit value in-place |
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| 259 | * @p: pointer to a naturally-aligned 32-bit value |
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| 260 | * |
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| 261 | * See __swahw32() for details of wordswapping |
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| 262 | */ |
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| 263 | static inline void __swahw32s(__u32 *p) |
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| 264 | { |
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| 265 | #ifdef __arch_swahw32s |
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| 266 | __arch_swahw32s(p); |
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| 267 | #else |
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| 268 | *p = __swahw32p(p); |
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| 269 | #endif |
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| 270 | } |
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| 271 | |||
| 272 | /** |
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| 273 | * __swahb32s - high and low byteswap a 32-bit value in-place |
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| 274 | * @p: pointer to a naturally-aligned 32-bit value |
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| 275 | * |
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| 276 | * See __swahb32() for details of high and low byte swapping |
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| 277 | */ |
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| 278 | static inline void __swahb32s(__u32 *p) |
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| 279 | { |
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| 280 | #ifdef __arch_swahb32s |
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| 281 | __arch_swahb32s(p); |
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| 282 | #else |
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| 283 | *p = __swahb32p(p); |
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| 284 | #endif |
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| 285 | } |
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| 286 | |||
| 287 | |||
| 288 | #endif /* _UAPI_LINUX_SWAB_H */ |