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 #ifdef __HAVE_BUILTIN_BSWAP16__
>> 49 return __builtin_bswap16(val);
>> 50 #elif defined (__arch_swab16)
51 return __arch_swab16(val); 51 return __arch_swab16(val);
52 #else 52 #else
53 return ___constant_swab16(val); 53 return ___constant_swab16(val);
54 #endif 54 #endif
55 } 55 }
56 56
57 static inline __attribute_const__ __u32 __fswa 57 static inline __attribute_const__ __u32 __fswab32(__u32 val)
58 { 58 {
59 #if defined(__arch_swab32) !! 59 #ifdef __HAVE_BUILTIN_BSWAP32__
>> 60 return __builtin_bswap32(val);
>> 61 #elif defined(__arch_swab32)
60 return __arch_swab32(val); 62 return __arch_swab32(val);
61 #else 63 #else
62 return ___constant_swab32(val); 64 return ___constant_swab32(val);
63 #endif 65 #endif
64 } 66 }
65 67
66 static inline __attribute_const__ __u64 __fswa 68 static inline __attribute_const__ __u64 __fswab64(__u64 val)
67 { 69 {
68 #if defined (__arch_swab64) !! 70 #ifdef __HAVE_BUILTIN_BSWAP64__
>> 71 return __builtin_bswap64(val);
>> 72 #elif defined (__arch_swab64)
69 return __arch_swab64(val); 73 return __arch_swab64(val);
70 #elif defined(__SWAB_64_THRU_32__) 74 #elif defined(__SWAB_64_THRU_32__)
71 __u32 h = val >> 32; 75 __u32 h = val >> 32;
72 __u32 l = val & ((1ULL << 32) - 1); 76 __u32 l = val & ((1ULL << 32) - 1);
73 return (((__u64)__fswab32(l)) << 32) | 77 return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h)));
74 #else 78 #else
75 return ___constant_swab64(val); 79 return ___constant_swab64(val);
76 #endif 80 #endif
77 } 81 }
78 82
79 static inline __attribute_const__ __u32 __fswa 83 static inline __attribute_const__ __u32 __fswahw32(__u32 val)
80 { 84 {
81 #ifdef __arch_swahw32 85 #ifdef __arch_swahw32
82 return __arch_swahw32(val); 86 return __arch_swahw32(val);
83 #else 87 #else
84 return ___constant_swahw32(val); 88 return ___constant_swahw32(val);
85 #endif 89 #endif
86 } 90 }
87 91
88 static inline __attribute_const__ __u32 __fswa 92 static inline __attribute_const__ __u32 __fswahb32(__u32 val)
89 { 93 {
90 #ifdef __arch_swahb32 94 #ifdef __arch_swahb32
91 return __arch_swahb32(val); 95 return __arch_swahb32(val);
92 #else 96 #else
93 return ___constant_swahb32(val); 97 return ___constant_swahb32(val);
94 #endif 98 #endif
95 } 99 }
96 100
97 /** 101 /**
98 * __swab16 - return a byteswapped 16-bit valu 102 * __swab16 - return a byteswapped 16-bit value
99 * @x: value to byteswap 103 * @x: value to byteswap
100 */ 104 */
101 #ifdef __HAVE_BUILTIN_BSWAP16__ <<
102 #define __swab16(x) (__u16)__builtin_bswap16(( <<
103 #else <<
104 #define __swab16(x) 105 #define __swab16(x) \
105 (__u16)(__builtin_constant_p(x) ? !! 106 (__builtin_constant_p((__u16)(x)) ? \
106 ___constant_swab16(x) : 107 ___constant_swab16(x) : \
107 __fswab16(x)) 108 __fswab16(x))
108 #endif <<
109 109
110 /** 110 /**
111 * __swab32 - return a byteswapped 32-bit valu 111 * __swab32 - return a byteswapped 32-bit value
112 * @x: value to byteswap 112 * @x: value to byteswap
113 */ 113 */
114 #ifdef __HAVE_BUILTIN_BSWAP32__ <<
115 #define __swab32(x) (__u32)__builtin_bswap32(( <<
116 #else <<
117 #define __swab32(x) 114 #define __swab32(x) \
118 (__u32)(__builtin_constant_p(x) ? !! 115 (__builtin_constant_p((__u32)(x)) ? \
119 ___constant_swab32(x) : 116 ___constant_swab32(x) : \
120 __fswab32(x)) 117 __fswab32(x))
121 #endif <<
122 118
123 /** 119 /**
124 * __swab64 - return a byteswapped 64-bit valu 120 * __swab64 - return a byteswapped 64-bit value
125 * @x: value to byteswap 121 * @x: value to byteswap
126 */ 122 */
127 #ifdef __HAVE_BUILTIN_BSWAP64__ <<
128 #define __swab64(x) (__u64)__builtin_bswap64(( <<
129 #else <<
130 #define __swab64(x) 123 #define __swab64(x) \
131 (__u64)(__builtin_constant_p(x) ? !! 124 (__builtin_constant_p((__u64)(x)) ? \
132 ___constant_swab64(x) : 125 ___constant_swab64(x) : \
133 __fswab64(x)) 126 __fswab64(x))
134 #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 } <<
144 127
145 /** 128 /**
146 * __swahw32 - return a word-swapped 32-bit va 129 * __swahw32 - return a word-swapped 32-bit value
147 * @x: value to wordswap 130 * @x: value to wordswap
148 * 131 *
149 * __swahw32(0x12340000) is 0x00001234 132 * __swahw32(0x12340000) is 0x00001234
150 */ 133 */
151 #define __swahw32(x) 134 #define __swahw32(x) \
152 (__builtin_constant_p((__u32)(x)) ? 135 (__builtin_constant_p((__u32)(x)) ? \
153 ___constant_swahw32(x) : 136 ___constant_swahw32(x) : \
154 __fswahw32(x)) 137 __fswahw32(x))
155 138
156 /** 139 /**
157 * __swahb32 - return a high and low byte-swap 140 * __swahb32 - return a high and low byte-swapped 32-bit value
158 * @x: value to byteswap 141 * @x: value to byteswap
159 * 142 *
160 * __swahb32(0x12345678) is 0x34127856 143 * __swahb32(0x12345678) is 0x34127856
161 */ 144 */
162 #define __swahb32(x) 145 #define __swahb32(x) \
163 (__builtin_constant_p((__u32)(x)) ? 146 (__builtin_constant_p((__u32)(x)) ? \
164 ___constant_swahb32(x) : 147 ___constant_swahb32(x) : \
165 __fswahb32(x)) 148 __fswahb32(x))
166 149
167 /** 150 /**
168 * __swab16p - return a byteswapped 16-bit val 151 * __swab16p - return a byteswapped 16-bit value from a pointer
169 * @p: pointer to a naturally-aligned 16-bit v 152 * @p: pointer to a naturally-aligned 16-bit value
170 */ 153 */
171 static __always_inline __u16 __swab16p(const _ !! 154 static inline __u16 __swab16p(const __u16 *p)
172 { 155 {
173 #ifdef __arch_swab16p 156 #ifdef __arch_swab16p
174 return __arch_swab16p(p); 157 return __arch_swab16p(p);
175 #else 158 #else
176 return __swab16(*p); 159 return __swab16(*p);
177 #endif 160 #endif
178 } 161 }
179 162
180 /** 163 /**
181 * __swab32p - return a byteswapped 32-bit val 164 * __swab32p - return a byteswapped 32-bit value from a pointer
182 * @p: pointer to a naturally-aligned 32-bit v 165 * @p: pointer to a naturally-aligned 32-bit value
183 */ 166 */
184 static __always_inline __u32 __swab32p(const _ !! 167 static inline __u32 __swab32p(const __u32 *p)
185 { 168 {
186 #ifdef __arch_swab32p 169 #ifdef __arch_swab32p
187 return __arch_swab32p(p); 170 return __arch_swab32p(p);
188 #else 171 #else
189 return __swab32(*p); 172 return __swab32(*p);
190 #endif 173 #endif
191 } 174 }
192 175
193 /** 176 /**
194 * __swab64p - return a byteswapped 64-bit val 177 * __swab64p - return a byteswapped 64-bit value from a pointer
195 * @p: pointer to a naturally-aligned 64-bit v 178 * @p: pointer to a naturally-aligned 64-bit value
196 */ 179 */
197 static __always_inline __u64 __swab64p(const _ !! 180 static inline __u64 __swab64p(const __u64 *p)
198 { 181 {
199 #ifdef __arch_swab64p 182 #ifdef __arch_swab64p
200 return __arch_swab64p(p); 183 return __arch_swab64p(p);
201 #else 184 #else
202 return __swab64(*p); 185 return __swab64(*p);
203 #endif 186 #endif
204 } 187 }
205 188
206 /** 189 /**
207 * __swahw32p - return a wordswapped 32-bit va 190 * __swahw32p - return a wordswapped 32-bit value from a pointer
208 * @p: pointer to a naturally-aligned 32-bit v 191 * @p: pointer to a naturally-aligned 32-bit value
209 * 192 *
210 * See __swahw32() for details of wordswapping 193 * See __swahw32() for details of wordswapping.
211 */ 194 */
212 static inline __u32 __swahw32p(const __u32 *p) 195 static inline __u32 __swahw32p(const __u32 *p)
213 { 196 {
214 #ifdef __arch_swahw32p 197 #ifdef __arch_swahw32p
215 return __arch_swahw32p(p); 198 return __arch_swahw32p(p);
216 #else 199 #else
217 return __swahw32(*p); 200 return __swahw32(*p);
218 #endif 201 #endif
219 } 202 }
220 203
221 /** 204 /**
222 * __swahb32p - return a high and low byteswap 205 * __swahb32p - return a high and low byteswapped 32-bit value from a pointer
223 * @p: pointer to a naturally-aligned 32-bit v 206 * @p: pointer to a naturally-aligned 32-bit value
224 * 207 *
225 * See __swahb32() for details of high/low byt 208 * See __swahb32() for details of high/low byteswapping.
226 */ 209 */
227 static inline __u32 __swahb32p(const __u32 *p) 210 static inline __u32 __swahb32p(const __u32 *p)
228 { 211 {
229 #ifdef __arch_swahb32p 212 #ifdef __arch_swahb32p
230 return __arch_swahb32p(p); 213 return __arch_swahb32p(p);
231 #else 214 #else
232 return __swahb32(*p); 215 return __swahb32(*p);
233 #endif 216 #endif
234 } 217 }
235 218
236 /** 219 /**
237 * __swab16s - byteswap a 16-bit value in-plac 220 * __swab16s - byteswap a 16-bit value in-place
238 * @p: pointer to a naturally-aligned 16-bit v 221 * @p: pointer to a naturally-aligned 16-bit value
239 */ 222 */
240 static inline void __swab16s(__u16 *p) 223 static inline void __swab16s(__u16 *p)
241 { 224 {
242 #ifdef __arch_swab16s 225 #ifdef __arch_swab16s
243 __arch_swab16s(p); 226 __arch_swab16s(p);
244 #else 227 #else
245 *p = __swab16p(p); 228 *p = __swab16p(p);
246 #endif 229 #endif
247 } 230 }
248 /** 231 /**
249 * __swab32s - byteswap a 32-bit value in-plac 232 * __swab32s - byteswap a 32-bit value in-place
250 * @p: pointer to a naturally-aligned 32-bit v 233 * @p: pointer to a naturally-aligned 32-bit value
251 */ 234 */
252 static __always_inline void __swab32s(__u32 *p !! 235 static inline void __swab32s(__u32 *p)
253 { 236 {
254 #ifdef __arch_swab32s 237 #ifdef __arch_swab32s
255 __arch_swab32s(p); 238 __arch_swab32s(p);
256 #else 239 #else
257 *p = __swab32p(p); 240 *p = __swab32p(p);
258 #endif 241 #endif
259 } 242 }
260 243
261 /** 244 /**
262 * __swab64s - byteswap a 64-bit value in-plac 245 * __swab64s - byteswap a 64-bit value in-place
263 * @p: pointer to a naturally-aligned 64-bit v 246 * @p: pointer to a naturally-aligned 64-bit value
264 */ 247 */
265 static __always_inline void __swab64s(__u64 *p !! 248 static inline void __swab64s(__u64 *p)
266 { 249 {
267 #ifdef __arch_swab64s 250 #ifdef __arch_swab64s
268 __arch_swab64s(p); 251 __arch_swab64s(p);
269 #else 252 #else
270 *p = __swab64p(p); 253 *p = __swab64p(p);
271 #endif 254 #endif
272 } 255 }
273 256
274 /** 257 /**
275 * __swahw32s - wordswap a 32-bit value in-pla 258 * __swahw32s - wordswap a 32-bit value in-place
276 * @p: pointer to a naturally-aligned 32-bit v 259 * @p: pointer to a naturally-aligned 32-bit value
277 * 260 *
278 * See __swahw32() for details of wordswapping 261 * See __swahw32() for details of wordswapping
279 */ 262 */
280 static inline void __swahw32s(__u32 *p) 263 static inline void __swahw32s(__u32 *p)
281 { 264 {
282 #ifdef __arch_swahw32s 265 #ifdef __arch_swahw32s
283 __arch_swahw32s(p); 266 __arch_swahw32s(p);
284 #else 267 #else
285 *p = __swahw32p(p); 268 *p = __swahw32p(p);
286 #endif 269 #endif
287 } 270 }
288 271
289 /** 272 /**
290 * __swahb32s - high and low byteswap a 32-bit 273 * __swahb32s - high and low byteswap a 32-bit value in-place
291 * @p: pointer to a naturally-aligned 32-bit v 274 * @p: pointer to a naturally-aligned 32-bit value
292 * 275 *
293 * See __swahb32() for details of high and low 276 * See __swahb32() for details of high and low byte swapping
294 */ 277 */
295 static inline void __swahb32s(__u32 *p) 278 static inline void __swahb32s(__u32 *p)
296 { 279 {
297 #ifdef __arch_swahb32s 280 #ifdef __arch_swahb32s
298 __arch_swahb32s(p); 281 __arch_swahb32s(p);
299 #else 282 #else
300 *p = __swahb32p(p); 283 *p = __swahb32p(p);
301 #endif 284 #endif
302 } 285 }
303 286
304 287
305 #endif /* _UAPI_LINUX_SWAB_H */ 288 #endif /* _UAPI_LINUX_SWAB_H */
306 289
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