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6f52b16c | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
607ca46e DH |
2 | #ifndef _UAPI_LINUX_SWAB_H |
3 | #define _UAPI_LINUX_SWAB_H | |
4 | ||
5 | #include <linux/types.h> | |
defbab27 | 6 | #include <linux/stddef.h> |
d5767057 | 7 | #include <asm/bitsperlong.h> |
607ca46e DH |
8 | #include <asm/swab.h> |
9 | ||
10 | /* | |
11 | * casts are necessary for constants, because we never know how for sure | |
12 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. | |
13 | */ | |
14 | #define ___constant_swab16(x) ((__u16)( \ | |
15 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ | |
16 | (((__u16)(x) & (__u16)0xff00U) >> 8))) | |
17 | ||
18 | #define ___constant_swab32(x) ((__u32)( \ | |
19 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ | |
20 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ | |
21 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | |
22 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) | |
23 | ||
24 | #define ___constant_swab64(x) ((__u64)( \ | |
25 | (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ | |
26 | (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ | |
27 | (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ | |
28 | (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ | |
29 | (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ | |
30 | (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ | |
31 | (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ | |
32 | (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) | |
33 | ||
34 | #define ___constant_swahw32(x) ((__u32)( \ | |
35 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ | |
36 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) | |
37 | ||
38 | #define ___constant_swahb32(x) ((__u32)( \ | |
39 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ | |
40 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) | |
41 | ||
42 | /* | |
43 | * Implement the following as inlines, but define the interface using | |
44 | * macros to allow constant folding when possible: | |
45 | * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 | |
46 | */ | |
47 | ||
48 | static inline __attribute_const__ __u16 __fswab16(__u16 val) | |
49 | { | |
7322dd75 | 50 | #if defined (__arch_swab16) |
607ca46e DH |
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 | { | |
7322dd75 | 59 | #if defined(__arch_swab32) |
607ca46e DH |
60 | return __arch_swab32(val); |
61 | #else | |
62 | return ___constant_swab32(val); | |
63 | #endif | |
64 | } | |
65 | ||
66 | static inline __attribute_const__ __u64 __fswab64(__u64 val) | |
67 | { | |
7322dd75 | 68 | #if defined (__arch_swab64) |
607ca46e DH |
69 | return __arch_swab64(val); |
70 | #elif defined(__SWAB_64_THRU_32__) | |
71 | __u32 h = val >> 32; | |
72 | __u32 l = val & ((1ULL << 32) - 1); | |
73 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); | |
74 | #else | |
75 | return ___constant_swab64(val); | |
76 | #endif | |
77 | } | |
78 | ||
79 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) | |
80 | { | |
81 | #ifdef __arch_swahw32 | |
82 | return __arch_swahw32(val); | |
83 | #else | |
84 | return ___constant_swahw32(val); | |
85 | #endif | |
86 | } | |
87 | ||
88 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) | |
89 | { | |
90 | #ifdef __arch_swahb32 | |
91 | return __arch_swahb32(val); | |
92 | #else | |
93 | return ___constant_swahb32(val); | |
94 | #endif | |
95 | } | |
96 | ||
97 | /** | |
98 | * __swab16 - return a byteswapped 16-bit value | |
99 | * @x: value to byteswap | |
100 | */ | |
7322dd75 AB |
101 | #ifdef __HAVE_BUILTIN_BSWAP16__ |
102 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) | |
103 | #else | |
607ca46e | 104 | #define __swab16(x) \ |
d30dfd49 | 105 | (__u16)(__builtin_constant_p(x) ? \ |
607ca46e DH |
106 | ___constant_swab16(x) : \ |
107 | __fswab16(x)) | |
7322dd75 | 108 | #endif |
607ca46e DH |
109 | |
110 | /** | |
111 | * __swab32 - return a byteswapped 32-bit value | |
112 | * @x: value to byteswap | |
113 | */ | |
7322dd75 AB |
114 | #ifdef __HAVE_BUILTIN_BSWAP32__ |
115 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) | |
116 | #else | |
607ca46e | 117 | #define __swab32(x) \ |
d30dfd49 | 118 | (__u32)(__builtin_constant_p(x) ? \ |
607ca46e DH |
119 | ___constant_swab32(x) : \ |
120 | __fswab32(x)) | |
7322dd75 | 121 | #endif |
607ca46e DH |
122 | |
123 | /** | |
124 | * __swab64 - return a byteswapped 64-bit value | |
125 | * @x: value to byteswap | |
126 | */ | |
7322dd75 AB |
127 | #ifdef __HAVE_BUILTIN_BSWAP64__ |
128 | #define __swab64(x) (__u64)__builtin_bswap64((__u64)(x)) | |
129 | #else | |
607ca46e | 130 | #define __swab64(x) \ |
d30dfd49 | 131 | (__u64)(__builtin_constant_p(x) ? \ |
607ca46e DH |
132 | ___constant_swab64(x) : \ |
133 | __fswab64(x)) | |
7322dd75 | 134 | #endif |
607ca46e | 135 | |
d5767057 YN |
136 | static __always_inline unsigned long __swab(const unsigned long y) |
137 | { | |
467d12f5 | 138 | #if __BITS_PER_LONG == 64 |
d5767057 | 139 | return __swab64(y); |
467d12f5 | 140 | #else /* __BITS_PER_LONG == 32 */ |
d5767057 YN |
141 | return __swab32(y); |
142 | #endif | |
143 | } | |
144 | ||
607ca46e DH |
145 | /** |
146 | * __swahw32 - return a word-swapped 32-bit value | |
147 | * @x: value to wordswap | |
148 | * | |
149 | * __swahw32(0x12340000) is 0x00001234 | |
150 | */ | |
151 | #define __swahw32(x) \ | |
152 | (__builtin_constant_p((__u32)(x)) ? \ | |
153 | ___constant_swahw32(x) : \ | |
154 | __fswahw32(x)) | |
155 | ||
156 | /** | |
157 | * __swahb32 - return a high and low byte-swapped 32-bit value | |
158 | * @x: value to byteswap | |
159 | * | |
160 | * __swahb32(0x12345678) is 0x34127856 | |
161 | */ | |
162 | #define __swahb32(x) \ | |
163 | (__builtin_constant_p((__u32)(x)) ? \ | |
164 | ___constant_swahb32(x) : \ | |
165 | __fswahb32(x)) | |
166 | ||
167 | /** | |
168 | * __swab16p - return a byteswapped 16-bit value from a pointer | |
169 | * @p: pointer to a naturally-aligned 16-bit value | |
170 | */ | |
bc27fb68 | 171 | static __always_inline __u16 __swab16p(const __u16 *p) |
607ca46e DH |
172 | { |
173 | #ifdef __arch_swab16p | |
174 | return __arch_swab16p(p); | |
175 | #else | |
176 | return __swab16(*p); | |
177 | #endif | |
178 | } | |
179 | ||
180 | /** | |
181 | * __swab32p - return a byteswapped 32-bit value from a pointer | |
182 | * @p: pointer to a naturally-aligned 32-bit value | |
183 | */ | |
bc27fb68 | 184 | static __always_inline __u32 __swab32p(const __u32 *p) |
607ca46e DH |
185 | { |
186 | #ifdef __arch_swab32p | |
187 | return __arch_swab32p(p); | |
188 | #else | |
189 | return __swab32(*p); | |
190 | #endif | |
191 | } | |
192 | ||
193 | /** | |
194 | * __swab64p - return a byteswapped 64-bit value from a pointer | |
195 | * @p: pointer to a naturally-aligned 64-bit value | |
196 | */ | |
bc27fb68 | 197 | static __always_inline __u64 __swab64p(const __u64 *p) |
607ca46e DH |
198 | { |
199 | #ifdef __arch_swab64p | |
200 | return __arch_swab64p(p); | |
201 | #else | |
202 | return __swab64(*p); | |
203 | #endif | |
204 | } | |
205 | ||
206 | /** | |
207 | * __swahw32p - return a wordswapped 32-bit value from a pointer | |
208 | * @p: pointer to a naturally-aligned 32-bit value | |
209 | * | |
210 | * See __swahw32() for details of wordswapping. | |
211 | */ | |
212 | static inline __u32 __swahw32p(const __u32 *p) | |
213 | { | |
214 | #ifdef __arch_swahw32p | |
215 | return __arch_swahw32p(p); | |
216 | #else | |
217 | return __swahw32(*p); | |
218 | #endif | |
219 | } | |
220 | ||
221 | /** | |
222 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer | |
223 | * @p: pointer to a naturally-aligned 32-bit value | |
224 | * | |
225 | * See __swahb32() for details of high/low byteswapping. | |
226 | */ | |
227 | static inline __u32 __swahb32p(const __u32 *p) | |
228 | { | |
229 | #ifdef __arch_swahb32p | |
230 | return __arch_swahb32p(p); | |
231 | #else | |
232 | return __swahb32(*p); | |
233 | #endif | |
234 | } | |
235 | ||
236 | /** | |
237 | * __swab16s - byteswap a 16-bit value in-place | |
238 | * @p: pointer to a naturally-aligned 16-bit value | |
239 | */ | |
240 | static inline void __swab16s(__u16 *p) | |
241 | { | |
242 | #ifdef __arch_swab16s | |
243 | __arch_swab16s(p); | |
244 | #else | |
245 | *p = __swab16p(p); | |
246 | #endif | |
247 | } | |
248 | /** | |
249 | * __swab32s - byteswap a 32-bit value in-place | |
250 | * @p: pointer to a naturally-aligned 32-bit value | |
251 | */ | |
bc27fb68 | 252 | static __always_inline void __swab32s(__u32 *p) |
607ca46e DH |
253 | { |
254 | #ifdef __arch_swab32s | |
255 | __arch_swab32s(p); | |
256 | #else | |
257 | *p = __swab32p(p); | |
258 | #endif | |
259 | } | |
260 | ||
261 | /** | |
262 | * __swab64s - byteswap a 64-bit value in-place | |
263 | * @p: pointer to a naturally-aligned 64-bit value | |
264 | */ | |
bc27fb68 | 265 | static __always_inline void __swab64s(__u64 *p) |
607ca46e DH |
266 | { |
267 | #ifdef __arch_swab64s | |
268 | __arch_swab64s(p); | |
269 | #else | |
270 | *p = __swab64p(p); | |
271 | #endif | |
272 | } | |
273 | ||
274 | /** | |
275 | * __swahw32s - wordswap a 32-bit value in-place | |
276 | * @p: pointer to a naturally-aligned 32-bit value | |
277 | * | |
278 | * See __swahw32() for details of wordswapping | |
279 | */ | |
280 | static inline void __swahw32s(__u32 *p) | |
281 | { | |
282 | #ifdef __arch_swahw32s | |
283 | __arch_swahw32s(p); | |
284 | #else | |
285 | *p = __swahw32p(p); | |
286 | #endif | |
287 | } | |
288 | ||
289 | /** | |
290 | * __swahb32s - high and low byteswap a 32-bit value in-place | |
291 | * @p: pointer to a naturally-aligned 32-bit value | |
292 | * | |
293 | * See __swahb32() for details of high and low byte swapping | |
294 | */ | |
295 | static inline void __swahb32s(__u32 *p) | |
296 | { | |
297 | #ifdef __arch_swahb32s | |
298 | __arch_swahb32s(p); | |
299 | #else | |
300 | *p = __swahb32p(p); | |
301 | #endif | |
302 | } | |
303 | ||
304 | ||
305 | #endif /* _UAPI_LINUX_SWAB_H */ |