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