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TOMOYO Linux Cross Reference
Linux/include/uapi/linux/swab.h

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  1 #ifndef _UAPI_LINUX_SWAB_H
  2 #define _UAPI_LINUX_SWAB_H
  3 
  4 #include <linux/types.h>
  5 #include <linux/compiler.h>
  6 #include <asm/swab.h>
  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 __HAVE_BUILTIN_BSWAP16__
 49         return __builtin_bswap16(val);
 50 #elif defined (__arch_swab16)
 51         return __arch_swab16(val);
 52 #else
 53         return ___constant_swab16(val);
 54 #endif
 55 }
 56 
 57 static inline __attribute_const__ __u32 __fswab32(__u32 val)
 58 {
 59 #ifdef __HAVE_BUILTIN_BSWAP32__
 60         return __builtin_bswap32(val);
 61 #elif defined(__arch_swab32)
 62         return __arch_swab32(val);
 63 #else
 64         return ___constant_swab32(val);
 65 #endif
 66 }
 67 
 68 static inline __attribute_const__ __u64 __fswab64(__u64 val)
 69 {
 70 #ifdef __HAVE_BUILTIN_BSWAP64__
 71         return __builtin_bswap64(val);
 72 #elif defined (__arch_swab64)
 73         return __arch_swab64(val);
 74 #elif defined(__SWAB_64_THRU_32__)
 75         __u32 h = val >> 32;
 76         __u32 l = val & ((1ULL << 32) - 1);
 77         return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h)));
 78 #else
 79         return ___constant_swab64(val);
 80 #endif
 81 }
 82 
 83 static inline __attribute_const__ __u32 __fswahw32(__u32 val)
 84 {
 85 #ifdef __arch_swahw32
 86         return __arch_swahw32(val);
 87 #else
 88         return ___constant_swahw32(val);
 89 #endif
 90 }
 91 
 92 static inline __attribute_const__ __u32 __fswahb32(__u32 val)
 93 {
 94 #ifdef __arch_swahb32
 95         return __arch_swahb32(val);
 96 #else
 97         return ___constant_swahb32(val);
 98 #endif
 99 }
100 
101 /**
102  * __swab16 - return a byteswapped 16-bit value
103  * @x: value to byteswap
104  */
105 #define __swab16(x)                             \
106         (__builtin_constant_p((__u16)(x)) ?     \
107         ___constant_swab16(x) :                 \
108         __fswab16(x))
109 
110 /**
111  * __swab32 - return a byteswapped 32-bit value
112  * @x: value to byteswap
113  */
114 #define __swab32(x)                             \
115         (__builtin_constant_p((__u32)(x)) ?     \
116         ___constant_swab32(x) :                 \
117         __fswab32(x))
118 
119 /**
120  * __swab64 - return a byteswapped 64-bit value
121  * @x: value to byteswap
122  */
123 #define __swab64(x)                             \
124         (__builtin_constant_p((__u64)(x)) ?     \
125         ___constant_swab64(x) :                 \
126         __fswab64(x))
127 
128 /**
129  * __swahw32 - return a word-swapped 32-bit value
130  * @x: value to wordswap
131  *
132  * __swahw32(0x12340000) is 0x00001234
133  */
134 #define __swahw32(x)                            \
135         (__builtin_constant_p((__u32)(x)) ?     \
136         ___constant_swahw32(x) :                \
137         __fswahw32(x))
138 
139 /**
140  * __swahb32 - return a high and low byte-swapped 32-bit value
141  * @x: value to byteswap
142  *
143  * __swahb32(0x12345678) is 0x34127856
144  */
145 #define __swahb32(x)                            \
146         (__builtin_constant_p((__u32)(x)) ?     \
147         ___constant_swahb32(x) :                \
148         __fswahb32(x))
149 
150 /**
151  * __swab16p - return a byteswapped 16-bit value from a pointer
152  * @p: pointer to a naturally-aligned 16-bit value
153  */
154 static inline __u16 __swab16p(const __u16 *p)
155 {
156 #ifdef __arch_swab16p
157         return __arch_swab16p(p);
158 #else
159         return __swab16(*p);
160 #endif
161 }
162 
163 /**
164  * __swab32p - return a byteswapped 32-bit value from a pointer
165  * @p: pointer to a naturally-aligned 32-bit value
166  */
167 static inline __u32 __swab32p(const __u32 *p)
168 {
169 #ifdef __arch_swab32p
170         return __arch_swab32p(p);
171 #else
172         return __swab32(*p);
173 #endif
174 }
175 
176 /**
177  * __swab64p - return a byteswapped 64-bit value from a pointer
178  * @p: pointer to a naturally-aligned 64-bit value
179  */
180 static inline __u64 __swab64p(const __u64 *p)
181 {
182 #ifdef __arch_swab64p
183         return __arch_swab64p(p);
184 #else
185         return __swab64(*p);
186 #endif
187 }
188 
189 /**
190  * __swahw32p - return a wordswapped 32-bit value from a pointer
191  * @p: pointer to a naturally-aligned 32-bit value
192  *
193  * See __swahw32() for details of wordswapping.
194  */
195 static inline __u32 __swahw32p(const __u32 *p)
196 {
197 #ifdef __arch_swahw32p
198         return __arch_swahw32p(p);
199 #else
200         return __swahw32(*p);
201 #endif
202 }
203 
204 /**
205  * __swahb32p - return a high and low byteswapped 32-bit value from a pointer
206  * @p: pointer to a naturally-aligned 32-bit value
207  *
208  * See __swahb32() for details of high/low byteswapping.
209  */
210 static inline __u32 __swahb32p(const __u32 *p)
211 {
212 #ifdef __arch_swahb32p
213         return __arch_swahb32p(p);
214 #else
215         return __swahb32(*p);
216 #endif
217 }
218 
219 /**
220  * __swab16s - byteswap a 16-bit value in-place
221  * @p: pointer to a naturally-aligned 16-bit value
222  */
223 static inline void __swab16s(__u16 *p)
224 {
225 #ifdef __arch_swab16s
226         __arch_swab16s(p);
227 #else
228         *p = __swab16p(p);
229 #endif
230 }
231 /**
232  * __swab32s - byteswap a 32-bit value in-place
233  * @p: pointer to a naturally-aligned 32-bit value
234  */
235 static inline void __swab32s(__u32 *p)
236 {
237 #ifdef __arch_swab32s
238         __arch_swab32s(p);
239 #else
240         *p = __swab32p(p);
241 #endif
242 }
243 
244 /**
245  * __swab64s - byteswap a 64-bit value in-place
246  * @p: pointer to a naturally-aligned 64-bit value
247  */
248 static inline void __swab64s(__u64 *p)
249 {
250 #ifdef __arch_swab64s
251         __arch_swab64s(p);
252 #else
253         *p = __swab64p(p);
254 #endif
255 }
256 
257 /**
258  * __swahw32s - wordswap a 32-bit value in-place
259  * @p: pointer to a naturally-aligned 32-bit value
260  *
261  * See __swahw32() for details of wordswapping
262  */
263 static inline void __swahw32s(__u32 *p)
264 {
265 #ifdef __arch_swahw32s
266         __arch_swahw32s(p);
267 #else
268         *p = __swahw32p(p);
269 #endif
270 }
271 
272 /**
273  * __swahb32s - high and low byteswap a 32-bit value in-place
274  * @p: pointer to a naturally-aligned 32-bit value
275  *
276  * See __swahb32() for details of high and low byte swapping
277  */
278 static inline void __swahb32s(__u32 *p)
279 {
280 #ifdef __arch_swahb32s
281         __arch_swahb32s(p);
282 #else
283         *p = __swahb32p(p);
284 #endif
285 }
286 
287 
288 #endif /* _UAPI_LINUX_SWAB_H */
289 

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