Rev 6934 | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
6082 | serge | 1 | #ifndef _UAPI_LINUX_SWAB_H |
2 | #define _UAPI_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 | { |
||
7143 | serge | 48 | #if defined (__arch_swab16) |
6082 | serge | 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 | { |
||
7143 | serge | 57 | #if defined(__arch_swab32) |
6082 | serge | 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 | { |
||
7143 | serge | 66 | #if defined (__arch_swab64) |
6082 | serge | 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 | */ |
||
7143 | serge | 99 | #ifdef __HAVE_BUILTIN_BSWAP16__ |
100 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) |
||
101 | #else |
||
6082 | serge | 102 | #define __swab16(x) \ |
103 | (__builtin_constant_p((__u16)(x)) ? \ |
||
104 | ___constant_swab16(x) : \ |
||
105 | __fswab16(x)) |
||
7143 | serge | 106 | #endif |
6082 | serge | 107 | |
108 | /** |
||
109 | * __swab32 - return a byteswapped 32-bit value |
||
110 | * @x: value to byteswap |
||
111 | */ |
||
7143 | serge | 112 | #ifdef __HAVE_BUILTIN_BSWAP32__ |
113 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) |
||
114 | #else |
||
6082 | serge | 115 | #define __swab32(x) \ |
116 | (__builtin_constant_p((__u32)(x)) ? \ |
||
117 | ___constant_swab32(x) : \ |
||
118 | __fswab32(x)) |
||
7143 | serge | 119 | #endif |
6082 | serge | 120 | |
121 | /** |
||
122 | * __swab64 - return a byteswapped 64-bit value |
||
123 | * @x: value to byteswap |
||
124 | */ |
||
7143 | serge | 125 | #ifdef __HAVE_BUILTIN_BSWAP64__ |
126 | #define __swab64(x) (__u64)__builtin_bswap64((__u64)(x)) |
||
127 | #else |
||
6082 | serge | 128 | #define __swab64(x) \ |
129 | (__builtin_constant_p((__u64)(x)) ? \ |
||
130 | ___constant_swab64(x) : \ |
||
131 | __fswab64(x)) |
||
7143 | serge | 132 | #endif |
6082 | serge | 133 | |
134 | /** |
||
135 | * __swahw32 - return a word-swapped 32-bit value |
||
136 | * @x: value to wordswap |
||
137 | * |
||
138 | * __swahw32(0x12340000) is 0x00001234 |
||
139 | */ |
||
140 | #define __swahw32(x) \ |
||
141 | (__builtin_constant_p((__u32)(x)) ? \ |
||
142 | ___constant_swahw32(x) : \ |
||
143 | __fswahw32(x)) |
||
144 | |||
145 | /** |
||
146 | * __swahb32 - return a high and low byte-swapped 32-bit value |
||
147 | * @x: value to byteswap |
||
148 | * |
||
149 | * __swahb32(0x12345678) is 0x34127856 |
||
150 | */ |
||
151 | #define __swahb32(x) \ |
||
152 | (__builtin_constant_p((__u32)(x)) ? \ |
||
153 | ___constant_swahb32(x) : \ |
||
154 | __fswahb32(x)) |
||
155 | |||
156 | /** |
||
157 | * __swab16p - return a byteswapped 16-bit value from a pointer |
||
158 | * @p: pointer to a naturally-aligned 16-bit value |
||
159 | */ |
||
7143 | serge | 160 | static __always_inline __u16 __swab16p(const __u16 *p) |
6082 | serge | 161 | { |
162 | #ifdef __arch_swab16p |
||
163 | return __arch_swab16p(p); |
||
164 | #else |
||
165 | return __swab16(*p); |
||
166 | #endif |
||
167 | } |
||
168 | |||
169 | /** |
||
170 | * __swab32p - return a byteswapped 32-bit value from a pointer |
||
171 | * @p: pointer to a naturally-aligned 32-bit value |
||
172 | */ |
||
7143 | serge | 173 | static __always_inline __u32 __swab32p(const __u32 *p) |
6082 | serge | 174 | { |
175 | #ifdef __arch_swab32p |
||
176 | return __arch_swab32p(p); |
||
177 | #else |
||
178 | return __swab32(*p); |
||
179 | #endif |
||
180 | } |
||
181 | |||
182 | /** |
||
183 | * __swab64p - return a byteswapped 64-bit value from a pointer |
||
184 | * @p: pointer to a naturally-aligned 64-bit value |
||
185 | */ |
||
7143 | serge | 186 | static __always_inline __u64 __swab64p(const __u64 *p) |
6082 | serge | 187 | { |
188 | #ifdef __arch_swab64p |
||
189 | return __arch_swab64p(p); |
||
190 | #else |
||
191 | return __swab64(*p); |
||
192 | #endif |
||
193 | } |
||
194 | |||
195 | /** |
||
196 | * __swahw32p - return a wordswapped 32-bit value from a pointer |
||
197 | * @p: pointer to a naturally-aligned 32-bit value |
||
198 | * |
||
199 | * See __swahw32() for details of wordswapping. |
||
200 | */ |
||
201 | static inline __u32 __swahw32p(const __u32 *p) |
||
202 | { |
||
203 | #ifdef __arch_swahw32p |
||
204 | return __arch_swahw32p(p); |
||
205 | #else |
||
206 | return __swahw32(*p); |
||
207 | #endif |
||
208 | } |
||
209 | |||
210 | /** |
||
211 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer |
||
212 | * @p: pointer to a naturally-aligned 32-bit value |
||
213 | * |
||
214 | * See __swahb32() for details of high/low byteswapping. |
||
215 | */ |
||
216 | static inline __u32 __swahb32p(const __u32 *p) |
||
217 | { |
||
218 | #ifdef __arch_swahb32p |
||
219 | return __arch_swahb32p(p); |
||
220 | #else |
||
221 | return __swahb32(*p); |
||
222 | #endif |
||
223 | } |
||
224 | |||
225 | /** |
||
226 | * __swab16s - byteswap a 16-bit value in-place |
||
227 | * @p: pointer to a naturally-aligned 16-bit value |
||
228 | */ |
||
229 | static inline void __swab16s(__u16 *p) |
||
230 | { |
||
231 | #ifdef __arch_swab16s |
||
232 | __arch_swab16s(p); |
||
233 | #else |
||
234 | *p = __swab16p(p); |
||
235 | #endif |
||
236 | } |
||
237 | /** |
||
238 | * __swab32s - byteswap a 32-bit value in-place |
||
239 | * @p: pointer to a naturally-aligned 32-bit value |
||
240 | */ |
||
7143 | serge | 241 | static __always_inline void __swab32s(__u32 *p) |
6082 | serge | 242 | { |
243 | #ifdef __arch_swab32s |
||
244 | __arch_swab32s(p); |
||
245 | #else |
||
246 | *p = __swab32p(p); |
||
247 | #endif |
||
248 | } |
||
249 | |||
250 | /** |
||
251 | * __swab64s - byteswap a 64-bit value in-place |
||
252 | * @p: pointer to a naturally-aligned 64-bit value |
||
253 | */ |
||
7143 | serge | 254 | static __always_inline void __swab64s(__u64 *p) |
6082 | serge | 255 | { |
256 | #ifdef __arch_swab64s |
||
257 | __arch_swab64s(p); |
||
258 | #else |
||
259 | *p = __swab64p(p); |
||
260 | #endif |
||
261 | } |
||
262 | |||
263 | /** |
||
264 | * __swahw32s - wordswap a 32-bit value in-place |
||
265 | * @p: pointer to a naturally-aligned 32-bit value |
||
266 | * |
||
267 | * See __swahw32() for details of wordswapping |
||
268 | */ |
||
269 | static inline void __swahw32s(__u32 *p) |
||
270 | { |
||
271 | #ifdef __arch_swahw32s |
||
272 | __arch_swahw32s(p); |
||
273 | #else |
||
274 | *p = __swahw32p(p); |
||
275 | #endif |
||
276 | } |
||
277 | |||
278 | /** |
||
279 | * __swahb32s - high and low byteswap a 32-bit value in-place |
||
280 | * @p: pointer to a naturally-aligned 32-bit value |
||
281 | * |
||
282 | * See __swahb32() for details of high and low byte swapping |
||
283 | */ |
||
284 | static inline void __swahb32s(__u32 *p) |
||
285 | { |
||
286 | #ifdef __arch_swahb32s |
||
287 | __arch_swahb32s(p); |
||
288 | #else |
||
289 | *p = __swahb32p(p); |
||
290 | #endif |
||
291 | } |
||
292 | |||
293 | |||
294 | #endif /* _UAPI_LINUX_SWAB_H */><>><>><>><>><>><>><>><>><>><>><> |