Go to most recent revision | Details | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1408 | serge | 1 | #ifndef _LINUX_SWAB_H |
| 2 | #define _LINUX_SWAB_H |
||
| 3 | |||
| 4 | #include |
||
| 5 | #include |
||
| 6 | #include |
||
| 7 | |||
| 8 | /* |
||
| 9 | * casts are necessary for constants, because we never know how for sure |
||
| 10 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. |
||
| 11 | */ |
||
| 12 | #define ___constant_swab16(x) ((__u16)( \ |
||
| 13 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ |
||
| 14 | (((__u16)(x) & (__u16)0xff00U) >> 8))) |
||
| 15 | |||
| 16 | #define ___constant_swab32(x) ((__u32)( \ |
||
| 17 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ |
||
| 18 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ |
||
| 19 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ |
||
| 20 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) |
||
| 21 | |||
| 22 | #define ___constant_swab64(x) ((__u64)( \ |
||
| 23 | (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ |
||
| 24 | (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ |
||
| 25 | (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ |
||
| 26 | (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ |
||
| 27 | (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ |
||
| 28 | (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ |
||
| 29 | (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ |
||
| 30 | (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) |
||
| 31 | |||
| 32 | #define ___constant_swahw32(x) ((__u32)( \ |
||
| 33 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ |
||
| 34 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) |
||
| 35 | |||
| 36 | #define ___constant_swahb32(x) ((__u32)( \ |
||
| 37 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ |
||
| 38 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) |
||
| 39 | |||
| 40 | /* |
||
| 41 | * Implement the following as inlines, but define the interface using |
||
| 42 | * macros to allow constant folding when possible: |
||
| 43 | * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 |
||
| 44 | */ |
||
| 45 | |||
| 46 | static inline __attribute_const__ __u16 __fswab16(__u16 val) |
||
| 47 | { |
||
| 48 | #ifdef __arch_swab16 |
||
| 49 | return __arch_swab16(val); |
||
| 50 | #else |
||
| 51 | return ___constant_swab16(val); |
||
| 52 | #endif |
||
| 53 | } |
||
| 54 | |||
| 55 | static inline __attribute_const__ __u32 __fswab32(__u32 val) |
||
| 56 | { |
||
| 57 | #ifdef __arch_swab32 |
||
| 58 | return __arch_swab32(val); |
||
| 59 | #else |
||
| 60 | return ___constant_swab32(val); |
||
| 61 | #endif |
||
| 62 | } |
||
| 63 | |||
| 64 | static inline __attribute_const__ __u64 __fswab64(__u64 val) |
||
| 65 | { |
||
| 66 | #ifdef __arch_swab64 |
||
| 67 | return __arch_swab64(val); |
||
| 68 | #elif defined(__SWAB_64_THRU_32__) |
||
| 69 | __u32 h = val >> 32; |
||
| 70 | __u32 l = val & ((1ULL << 32) - 1); |
||
| 71 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); |
||
| 72 | #else |
||
| 73 | return ___constant_swab64(val); |
||
| 74 | #endif |
||
| 75 | } |
||
| 76 | |||
| 77 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) |
||
| 78 | { |
||
| 79 | #ifdef __arch_swahw32 |
||
| 80 | return __arch_swahw32(val); |
||
| 81 | #else |
||
| 82 | return ___constant_swahw32(val); |
||
| 83 | #endif |
||
| 84 | } |
||
| 85 | |||
| 86 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) |
||
| 87 | { |
||
| 88 | #ifdef __arch_swahb32 |
||
| 89 | return __arch_swahb32(val); |
||
| 90 | #else |
||
| 91 | return ___constant_swahb32(val); |
||
| 92 | #endif |
||
| 93 | } |
||
| 94 | |||
| 95 | /** |
||
| 96 | * __swab16 - return a byteswapped 16-bit value |
||
| 97 | * @x: value to byteswap |
||
| 98 | */ |
||
| 99 | #define __swab16(x) \ |
||
| 100 | (__builtin_constant_p((__u16)(x)) ? \ |
||
| 101 | ___constant_swab16(x) : \ |
||
| 102 | __fswab16(x)) |
||
| 103 | |||
| 104 | /** |
||
| 105 | * __swab32 - return a byteswapped 32-bit value |
||
| 106 | * @x: value to byteswap |
||
| 107 | */ |
||
| 108 | #define __swab32(x) \ |
||
| 109 | (__builtin_constant_p((__u32)(x)) ? \ |
||
| 110 | ___constant_swab32(x) : \ |
||
| 111 | __fswab32(x)) |
||
| 112 | |||
| 113 | /** |
||
| 114 | * __swab64 - return a byteswapped 64-bit value |
||
| 115 | * @x: value to byteswap |
||
| 116 | */ |
||
| 117 | #define __swab64(x) \ |
||
| 118 | (__builtin_constant_p((__u64)(x)) ? \ |
||
| 119 | ___constant_swab64(x) : \ |
||
| 120 | __fswab64(x)) |
||
| 121 | |||
| 122 | /** |
||
| 123 | * __swahw32 - return a word-swapped 32-bit value |
||
| 124 | * @x: value to wordswap |
||
| 125 | * |
||
| 126 | * __swahw32(0x12340000) is 0x00001234 |
||
| 127 | */ |
||
| 128 | #define __swahw32(x) \ |
||
| 129 | (__builtin_constant_p((__u32)(x)) ? \ |
||
| 130 | ___constant_swahw32(x) : \ |
||
| 131 | __fswahw32(x)) |
||
| 132 | |||
| 133 | /** |
||
| 134 | * __swahb32 - return a high and low byte-swapped 32-bit value |
||
| 135 | * @x: value to byteswap |
||
| 136 | * |
||
| 137 | * __swahb32(0x12345678) is 0x34127856 |
||
| 138 | */ |
||
| 139 | #define __swahb32(x) \ |
||
| 140 | (__builtin_constant_p((__u32)(x)) ? \ |
||
| 141 | ___constant_swahb32(x) : \ |
||
| 142 | __fswahb32(x)) |
||
| 143 | |||
| 144 | /** |
||
| 145 | * __swab16p - return a byteswapped 16-bit value from a pointer |
||
| 146 | * @p: pointer to a naturally-aligned 16-bit value |
||
| 147 | */ |
||
| 148 | static inline __u16 __swab16p(const __u16 *p) |
||
| 149 | { |
||
| 150 | #ifdef __arch_swab16p |
||
| 151 | return __arch_swab16p(p); |
||
| 152 | #else |
||
| 153 | return __swab16(*p); |
||
| 154 | #endif |
||
| 155 | } |
||
| 156 | |||
| 157 | /** |
||
| 158 | * __swab32p - return a byteswapped 32-bit value from a pointer |
||
| 159 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 160 | */ |
||
| 161 | static inline __u32 __swab32p(const __u32 *p) |
||
| 162 | { |
||
| 163 | #ifdef __arch_swab32p |
||
| 164 | return __arch_swab32p(p); |
||
| 165 | #else |
||
| 166 | return __swab32(*p); |
||
| 167 | #endif |
||
| 168 | } |
||
| 169 | |||
| 170 | /** |
||
| 171 | * __swab64p - return a byteswapped 64-bit value from a pointer |
||
| 172 | * @p: pointer to a naturally-aligned 64-bit value |
||
| 173 | */ |
||
| 174 | static inline __u64 __swab64p(const __u64 *p) |
||
| 175 | { |
||
| 176 | #ifdef __arch_swab64p |
||
| 177 | return __arch_swab64p(p); |
||
| 178 | #else |
||
| 179 | return __swab64(*p); |
||
| 180 | #endif |
||
| 181 | } |
||
| 182 | |||
| 183 | /** |
||
| 184 | * __swahw32p - return a wordswapped 32-bit value from a pointer |
||
| 185 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 186 | * |
||
| 187 | * See __swahw32() for details of wordswapping. |
||
| 188 | */ |
||
| 189 | static inline __u32 __swahw32p(const __u32 *p) |
||
| 190 | { |
||
| 191 | #ifdef __arch_swahw32p |
||
| 192 | return __arch_swahw32p(p); |
||
| 193 | #else |
||
| 194 | return __swahw32(*p); |
||
| 195 | #endif |
||
| 196 | } |
||
| 197 | |||
| 198 | /** |
||
| 199 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer |
||
| 200 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 201 | * |
||
| 202 | * See __swahb32() for details of high/low byteswapping. |
||
| 203 | */ |
||
| 204 | static inline __u32 __swahb32p(const __u32 *p) |
||
| 205 | { |
||
| 206 | #ifdef __arch_swahb32p |
||
| 207 | return __arch_swahb32p(p); |
||
| 208 | #else |
||
| 209 | return __swahb32(*p); |
||
| 210 | #endif |
||
| 211 | } |
||
| 212 | |||
| 213 | /** |
||
| 214 | * __swab16s - byteswap a 16-bit value in-place |
||
| 215 | * @p: pointer to a naturally-aligned 16-bit value |
||
| 216 | */ |
||
| 217 | static inline void __swab16s(__u16 *p) |
||
| 218 | { |
||
| 219 | #ifdef __arch_swab16s |
||
| 220 | __arch_swab16s(p); |
||
| 221 | #else |
||
| 222 | *p = __swab16p(p); |
||
| 223 | #endif |
||
| 224 | } |
||
| 225 | /** |
||
| 226 | * __swab32s - byteswap a 32-bit value in-place |
||
| 227 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 228 | */ |
||
| 229 | static inline void __swab32s(__u32 *p) |
||
| 230 | { |
||
| 231 | #ifdef __arch_swab32s |
||
| 232 | __arch_swab32s(p); |
||
| 233 | #else |
||
| 234 | *p = __swab32p(p); |
||
| 235 | #endif |
||
| 236 | } |
||
| 237 | |||
| 238 | /** |
||
| 239 | * __swab64s - byteswap a 64-bit value in-place |
||
| 240 | * @p: pointer to a naturally-aligned 64-bit value |
||
| 241 | */ |
||
| 242 | static inline void __swab64s(__u64 *p) |
||
| 243 | { |
||
| 244 | #ifdef __arch_swab64s |
||
| 245 | __arch_swab64s(p); |
||
| 246 | #else |
||
| 247 | *p = __swab64p(p); |
||
| 248 | #endif |
||
| 249 | } |
||
| 250 | |||
| 251 | /** |
||
| 252 | * __swahw32s - wordswap a 32-bit value in-place |
||
| 253 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 254 | * |
||
| 255 | * See __swahw32() for details of wordswapping |
||
| 256 | */ |
||
| 257 | static inline void __swahw32s(__u32 *p) |
||
| 258 | { |
||
| 259 | #ifdef __arch_swahw32s |
||
| 260 | __arch_swahw32s(p); |
||
| 261 | #else |
||
| 262 | *p = __swahw32p(p); |
||
| 263 | #endif |
||
| 264 | } |
||
| 265 | |||
| 266 | /** |
||
| 267 | * __swahb32s - high and low byteswap a 32-bit value in-place |
||
| 268 | * @p: pointer to a naturally-aligned 32-bit value |
||
| 269 | * |
||
| 270 | * See __swahb32() for details of high and low byte swapping |
||
| 271 | */ |
||
| 272 | static inline void __swahb32s(__u32 *p) |
||
| 273 | { |
||
| 274 | #ifdef __arch_swahb32s |
||
| 275 | __arch_swahb32s(p); |
||
| 276 | #else |
||
| 277 | *p = __swahb32p(p); |
||
| 278 | #endif |
||
| 279 | } |
||
| 280 | |||
| 281 | #ifdef __KERNEL__ |
||
| 282 | # define swab16 __swab16 |
||
| 283 | # define swab32 __swab32 |
||
| 284 | # define swab64 __swab64 |
||
| 285 | # define swahw32 __swahw32 |
||
| 286 | # define swahb32 __swahb32 |
||
| 287 | # define swab16p __swab16p |
||
| 288 | # define swab32p __swab32p |
||
| 289 | # define swab64p __swab64p |
||
| 290 | # define swahw32p __swahw32p |
||
| 291 | # define swahb32p __swahb32p |
||
| 292 | # define swab16s __swab16s |
||
| 293 | # define swab32s __swab32s |
||
| 294 | # define swab64s __swab64s |
||
| 295 | # define swahw32s __swahw32s |
||
| 296 | # define swahb32s __swahb32s |
||
| 297 | #endif /* __KERNEL__ */ |
||
| 298 | |||
| 299 | #endif /* _LINUX_SWAB_H */ |