1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux <<
2 #ifndef _UAPI_LINUX_SWAB_H 1 #ifndef _UAPI_LINUX_SWAB_H
3 #define _UAPI_LINUX_SWAB_H 2 #define _UAPI_LINUX_SWAB_H
4 3
5 #include <linux/types.h> 4 #include <linux/types.h>
6 #include <linux/stddef.h> !! 5 #include <linux/compiler.h>
7 #include <asm/bitsperlong.h> <<
8 #include <asm/swab.h> 6 #include <asm/swab.h>
9 7
10 /* 8 /*
11 * casts are necessary for constants, because 9 * casts are necessary for constants, because we never know how for sure
12 * how U/UL/ULL map to __u16, __u32, __u64. At 10 * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
13 */ 11 */
14 #define ___constant_swab16(x) ((__u16)( 12 #define ___constant_swab16(x) ((__u16)( \
15 (((__u16)(x) & (__u16)0x00ffU) << 8) | 13 (((__u16)(x) & (__u16)0x00ffU) << 8) | \
16 (((__u16)(x) & (__u16)0xff00U) >> 8))) 14 (((__u16)(x) & (__u16)0xff00U) >> 8)))
17 15
18 #define ___constant_swab32(x) ((__u32)( 16 #define ___constant_swab32(x) ((__u32)( \
19 (((__u32)(x) & (__u32)0x000000ffUL) << 17 (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
20 (((__u32)(x) & (__u32)0x0000ff00UL) << 18 (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
21 (((__u32)(x) & (__u32)0x00ff0000UL) >> 19 (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
22 (((__u32)(x) & (__u32)0xff000000UL) >> 20 (((__u32)(x) & (__u32)0xff000000UL) >> 24)))
23 21
24 #define ___constant_swab64(x) ((__u64)( 22 #define ___constant_swab64(x) ((__u64)( \
25 (((__u64)(x) & (__u64)0x00000000000000 23 (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
26 (((__u64)(x) & (__u64)0x000000000000ff 24 (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
27 (((__u64)(x) & (__u64)0x0000000000ff00 25 (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
28 (((__u64)(x) & (__u64)0x00000000ff0000 26 (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \
29 (((__u64)(x) & (__u64)0x000000ff000000 27 (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \
30 (((__u64)(x) & (__u64)0x0000ff00000000 28 (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
31 (((__u64)(x) & (__u64)0x00ff0000000000 29 (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
32 (((__u64)(x) & (__u64)0xff000000000000 30 (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
33 31
34 #define ___constant_swahw32(x) ((__u32)( 32 #define ___constant_swahw32(x) ((__u32)( \
35 (((__u32)(x) & (__u32)0x0000ffffUL) << 33 (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
36 (((__u32)(x) & (__u32)0xffff0000UL) >> 34 (((__u32)(x) & (__u32)0xffff0000UL) >> 16)))
37 35
38 #define ___constant_swahb32(x) ((__u32)( 36 #define ___constant_swahb32(x) ((__u32)( \
39 (((__u32)(x) & (__u32)0x00ff00ffUL) << 37 (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
40 (((__u32)(x) & (__u32)0xff00ff00UL) >> 38 (((__u32)(x) & (__u32)0xff00ff00UL) >> 8)))
41 39
42 /* 40 /*
43 * Implement the following as inlines, but def 41 * Implement the following as inlines, but define the interface using
44 * macros to allow constant folding when possi 42 * macros to allow constant folding when possible:
45 * ___swab16, ___swab32, ___swab64, ___swahw32 43 * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32
46 */ 44 */
47 45
48 static inline __attribute_const__ __u16 __fswa 46 static inline __attribute_const__ __u16 __fswab16(__u16 val)
49 { 47 {
50 #if defined (__arch_swab16) 48 #if defined (__arch_swab16)
51 return __arch_swab16(val); 49 return __arch_swab16(val);
52 #else 50 #else
53 return ___constant_swab16(val); 51 return ___constant_swab16(val);
54 #endif 52 #endif
55 } 53 }
56 54
57 static inline __attribute_const__ __u32 __fswa 55 static inline __attribute_const__ __u32 __fswab32(__u32 val)
58 { 56 {
59 #if defined(__arch_swab32) 57 #if defined(__arch_swab32)
60 return __arch_swab32(val); 58 return __arch_swab32(val);
61 #else 59 #else
62 return ___constant_swab32(val); 60 return ___constant_swab32(val);
63 #endif 61 #endif
64 } 62 }
65 63
66 static inline __attribute_const__ __u64 __fswa 64 static inline __attribute_const__ __u64 __fswab64(__u64 val)
67 { 65 {
68 #if defined (__arch_swab64) 66 #if defined (__arch_swab64)
69 return __arch_swab64(val); 67 return __arch_swab64(val);
70 #elif defined(__SWAB_64_THRU_32__) 68 #elif defined(__SWAB_64_THRU_32__)
71 __u32 h = val >> 32; 69 __u32 h = val >> 32;
72 __u32 l = val & ((1ULL << 32) - 1); 70 __u32 l = val & ((1ULL << 32) - 1);
73 return (((__u64)__fswab32(l)) << 32) | 71 return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h)));
74 #else 72 #else
75 return ___constant_swab64(val); 73 return ___constant_swab64(val);
76 #endif 74 #endif
77 } 75 }
78 76
79 static inline __attribute_const__ __u32 __fswa 77 static inline __attribute_const__ __u32 __fswahw32(__u32 val)
80 { 78 {
81 #ifdef __arch_swahw32 79 #ifdef __arch_swahw32
82 return __arch_swahw32(val); 80 return __arch_swahw32(val);
83 #else 81 #else
84 return ___constant_swahw32(val); 82 return ___constant_swahw32(val);
85 #endif 83 #endif
86 } 84 }
87 85
88 static inline __attribute_const__ __u32 __fswa 86 static inline __attribute_const__ __u32 __fswahb32(__u32 val)
89 { 87 {
90 #ifdef __arch_swahb32 88 #ifdef __arch_swahb32
91 return __arch_swahb32(val); 89 return __arch_swahb32(val);
92 #else 90 #else
93 return ___constant_swahb32(val); 91 return ___constant_swahb32(val);
94 #endif 92 #endif
95 } 93 }
96 94
97 /** 95 /**
98 * __swab16 - return a byteswapped 16-bit valu 96 * __swab16 - return a byteswapped 16-bit value
99 * @x: value to byteswap 97 * @x: value to byteswap
100 */ 98 */
101 #ifdef __HAVE_BUILTIN_BSWAP16__ 99 #ifdef __HAVE_BUILTIN_BSWAP16__
102 #define __swab16(x) (__u16)__builtin_bswap16(( 100 #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
103 #else 101 #else
104 #define __swab16(x) 102 #define __swab16(x) \
105 (__u16)(__builtin_constant_p(x) ? !! 103 (__builtin_constant_p((__u16)(x)) ? \
106 ___constant_swab16(x) : 104 ___constant_swab16(x) : \
107 __fswab16(x)) 105 __fswab16(x))
108 #endif 106 #endif
109 107
110 /** 108 /**
111 * __swab32 - return a byteswapped 32-bit valu 109 * __swab32 - return a byteswapped 32-bit value
112 * @x: value to byteswap 110 * @x: value to byteswap
113 */ 111 */
114 #ifdef __HAVE_BUILTIN_BSWAP32__ 112 #ifdef __HAVE_BUILTIN_BSWAP32__
115 #define __swab32(x) (__u32)__builtin_bswap32(( 113 #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
116 #else 114 #else
117 #define __swab32(x) 115 #define __swab32(x) \
118 (__u32)(__builtin_constant_p(x) ? !! 116 (__builtin_constant_p((__u32)(x)) ? \
119 ___constant_swab32(x) : 117 ___constant_swab32(x) : \
120 __fswab32(x)) 118 __fswab32(x))
121 #endif 119 #endif
122 120
123 /** 121 /**
124 * __swab64 - return a byteswapped 64-bit valu 122 * __swab64 - return a byteswapped 64-bit value
125 * @x: value to byteswap 123 * @x: value to byteswap
126 */ 124 */
127 #ifdef __HAVE_BUILTIN_BSWAP64__ 125 #ifdef __HAVE_BUILTIN_BSWAP64__
128 #define __swab64(x) (__u64)__builtin_bswap64(( 126 #define __swab64(x) (__u64)__builtin_bswap64((__u64)(x))
129 #else 127 #else
130 #define __swab64(x) 128 #define __swab64(x) \
131 (__u64)(__builtin_constant_p(x) ? !! 129 (__builtin_constant_p((__u64)(x)) ? \
132 ___constant_swab64(x) : 130 ___constant_swab64(x) : \
133 __fswab64(x)) 131 __fswab64(x))
134 #endif 132 #endif
135 <<
136 static __always_inline unsigned long __swab(co <<
137 { <<
138 #if __BITS_PER_LONG == 64 <<
139 return __swab64(y); <<
140 #else /* __BITS_PER_LONG == 32 */ <<
141 return __swab32(y); <<
142 #endif <<
143 } <<
144 133
145 /** 134 /**
146 * __swahw32 - return a word-swapped 32-bit va 135 * __swahw32 - return a word-swapped 32-bit value
147 * @x: value to wordswap 136 * @x: value to wordswap
148 * 137 *
149 * __swahw32(0x12340000) is 0x00001234 138 * __swahw32(0x12340000) is 0x00001234
150 */ 139 */
151 #define __swahw32(x) 140 #define __swahw32(x) \
152 (__builtin_constant_p((__u32)(x)) ? 141 (__builtin_constant_p((__u32)(x)) ? \
153 ___constant_swahw32(x) : 142 ___constant_swahw32(x) : \
154 __fswahw32(x)) 143 __fswahw32(x))
155 144
156 /** 145 /**
157 * __swahb32 - return a high and low byte-swap 146 * __swahb32 - return a high and low byte-swapped 32-bit value
158 * @x: value to byteswap 147 * @x: value to byteswap
159 * 148 *
160 * __swahb32(0x12345678) is 0x34127856 149 * __swahb32(0x12345678) is 0x34127856
161 */ 150 */
162 #define __swahb32(x) 151 #define __swahb32(x) \
163 (__builtin_constant_p((__u32)(x)) ? 152 (__builtin_constant_p((__u32)(x)) ? \
164 ___constant_swahb32(x) : 153 ___constant_swahb32(x) : \
165 __fswahb32(x)) 154 __fswahb32(x))
166 155
167 /** 156 /**
168 * __swab16p - return a byteswapped 16-bit val 157 * __swab16p - return a byteswapped 16-bit value from a pointer
169 * @p: pointer to a naturally-aligned 16-bit v 158 * @p: pointer to a naturally-aligned 16-bit value
170 */ 159 */
171 static __always_inline __u16 __swab16p(const _ 160 static __always_inline __u16 __swab16p(const __u16 *p)
172 { 161 {
173 #ifdef __arch_swab16p 162 #ifdef __arch_swab16p
174 return __arch_swab16p(p); 163 return __arch_swab16p(p);
175 #else 164 #else
176 return __swab16(*p); 165 return __swab16(*p);
177 #endif 166 #endif
178 } 167 }
179 168
180 /** 169 /**
181 * __swab32p - return a byteswapped 32-bit val 170 * __swab32p - return a byteswapped 32-bit value from a pointer
182 * @p: pointer to a naturally-aligned 32-bit v 171 * @p: pointer to a naturally-aligned 32-bit value
183 */ 172 */
184 static __always_inline __u32 __swab32p(const _ 173 static __always_inline __u32 __swab32p(const __u32 *p)
185 { 174 {
186 #ifdef __arch_swab32p 175 #ifdef __arch_swab32p
187 return __arch_swab32p(p); 176 return __arch_swab32p(p);
188 #else 177 #else
189 return __swab32(*p); 178 return __swab32(*p);
190 #endif 179 #endif
191 } 180 }
192 181
193 /** 182 /**
194 * __swab64p - return a byteswapped 64-bit val 183 * __swab64p - return a byteswapped 64-bit value from a pointer
195 * @p: pointer to a naturally-aligned 64-bit v 184 * @p: pointer to a naturally-aligned 64-bit value
196 */ 185 */
197 static __always_inline __u64 __swab64p(const _ 186 static __always_inline __u64 __swab64p(const __u64 *p)
198 { 187 {
199 #ifdef __arch_swab64p 188 #ifdef __arch_swab64p
200 return __arch_swab64p(p); 189 return __arch_swab64p(p);
201 #else 190 #else
202 return __swab64(*p); 191 return __swab64(*p);
203 #endif 192 #endif
204 } 193 }
205 194
206 /** 195 /**
207 * __swahw32p - return a wordswapped 32-bit va 196 * __swahw32p - return a wordswapped 32-bit value from a pointer
208 * @p: pointer to a naturally-aligned 32-bit v 197 * @p: pointer to a naturally-aligned 32-bit value
209 * 198 *
210 * See __swahw32() for details of wordswapping 199 * See __swahw32() for details of wordswapping.
211 */ 200 */
212 static inline __u32 __swahw32p(const __u32 *p) 201 static inline __u32 __swahw32p(const __u32 *p)
213 { 202 {
214 #ifdef __arch_swahw32p 203 #ifdef __arch_swahw32p
215 return __arch_swahw32p(p); 204 return __arch_swahw32p(p);
216 #else 205 #else
217 return __swahw32(*p); 206 return __swahw32(*p);
218 #endif 207 #endif
219 } 208 }
220 209
221 /** 210 /**
222 * __swahb32p - return a high and low byteswap 211 * __swahb32p - return a high and low byteswapped 32-bit value from a pointer
223 * @p: pointer to a naturally-aligned 32-bit v 212 * @p: pointer to a naturally-aligned 32-bit value
224 * 213 *
225 * See __swahb32() for details of high/low byt 214 * See __swahb32() for details of high/low byteswapping.
226 */ 215 */
227 static inline __u32 __swahb32p(const __u32 *p) 216 static inline __u32 __swahb32p(const __u32 *p)
228 { 217 {
229 #ifdef __arch_swahb32p 218 #ifdef __arch_swahb32p
230 return __arch_swahb32p(p); 219 return __arch_swahb32p(p);
231 #else 220 #else
232 return __swahb32(*p); 221 return __swahb32(*p);
233 #endif 222 #endif
234 } 223 }
235 224
236 /** 225 /**
237 * __swab16s - byteswap a 16-bit value in-plac 226 * __swab16s - byteswap a 16-bit value in-place
238 * @p: pointer to a naturally-aligned 16-bit v 227 * @p: pointer to a naturally-aligned 16-bit value
239 */ 228 */
240 static inline void __swab16s(__u16 *p) 229 static inline void __swab16s(__u16 *p)
241 { 230 {
242 #ifdef __arch_swab16s 231 #ifdef __arch_swab16s
243 __arch_swab16s(p); 232 __arch_swab16s(p);
244 #else 233 #else
245 *p = __swab16p(p); 234 *p = __swab16p(p);
246 #endif 235 #endif
247 } 236 }
248 /** 237 /**
249 * __swab32s - byteswap a 32-bit value in-plac 238 * __swab32s - byteswap a 32-bit value in-place
250 * @p: pointer to a naturally-aligned 32-bit v 239 * @p: pointer to a naturally-aligned 32-bit value
251 */ 240 */
252 static __always_inline void __swab32s(__u32 *p 241 static __always_inline void __swab32s(__u32 *p)
253 { 242 {
254 #ifdef __arch_swab32s 243 #ifdef __arch_swab32s
255 __arch_swab32s(p); 244 __arch_swab32s(p);
256 #else 245 #else
257 *p = __swab32p(p); 246 *p = __swab32p(p);
258 #endif 247 #endif
259 } 248 }
260 249
261 /** 250 /**
262 * __swab64s - byteswap a 64-bit value in-plac 251 * __swab64s - byteswap a 64-bit value in-place
263 * @p: pointer to a naturally-aligned 64-bit v 252 * @p: pointer to a naturally-aligned 64-bit value
264 */ 253 */
265 static __always_inline void __swab64s(__u64 *p 254 static __always_inline void __swab64s(__u64 *p)
266 { 255 {
267 #ifdef __arch_swab64s 256 #ifdef __arch_swab64s
268 __arch_swab64s(p); 257 __arch_swab64s(p);
269 #else 258 #else
270 *p = __swab64p(p); 259 *p = __swab64p(p);
271 #endif 260 #endif
272 } 261 }
273 262
274 /** 263 /**
275 * __swahw32s - wordswap a 32-bit value in-pla 264 * __swahw32s - wordswap a 32-bit value in-place
276 * @p: pointer to a naturally-aligned 32-bit v 265 * @p: pointer to a naturally-aligned 32-bit value
277 * 266 *
278 * See __swahw32() for details of wordswapping 267 * See __swahw32() for details of wordswapping
279 */ 268 */
280 static inline void __swahw32s(__u32 *p) 269 static inline void __swahw32s(__u32 *p)
281 { 270 {
282 #ifdef __arch_swahw32s 271 #ifdef __arch_swahw32s
283 __arch_swahw32s(p); 272 __arch_swahw32s(p);
284 #else 273 #else
285 *p = __swahw32p(p); 274 *p = __swahw32p(p);
286 #endif 275 #endif
287 } 276 }
288 277
289 /** 278 /**
290 * __swahb32s - high and low byteswap a 32-bit 279 * __swahb32s - high and low byteswap a 32-bit value in-place
291 * @p: pointer to a naturally-aligned 32-bit v 280 * @p: pointer to a naturally-aligned 32-bit value
292 * 281 *
293 * See __swahb32() for details of high and low 282 * See __swahb32() for details of high and low byte swapping
294 */ 283 */
295 static inline void __swahb32s(__u32 *p) 284 static inline void __swahb32s(__u32 *p)
296 { 285 {
297 #ifdef __arch_swahb32s 286 #ifdef __arch_swahb32s
298 __arch_swahb32s(p); 287 __arch_swahb32s(p);
299 #else 288 #else
300 *p = __swahb32p(p); 289 *p = __swahb32p(p);
301 #endif 290 #endif
302 } 291 }
303 292
304 293
305 #endif /* _UAPI_LINUX_SWAB_H */ 294 #endif /* _UAPI_LINUX_SWAB_H */
306 295
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