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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> | |
6 | #include <linux/compiler.h> | |
7 | #include <asm/swab.h> | |
8 | ||
9 | /* | |
10 | * casts are necessary for constants, because we never know how for sure | |
11 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. | |
12 | */ | |
13 | #define ___constant_swab16(x) ((__u16)( \ | |
14 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ | |
15 | (((__u16)(x) & (__u16)0xff00U) >> 8))) | |
16 | ||
17 | #define ___constant_swab32(x) ((__u32)( \ | |
18 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ | |
19 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ | |
20 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | |
21 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) | |
22 | ||
23 | #define ___constant_swab64(x) ((__u64)( \ | |
24 | (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ | |
25 | (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ | |
26 | (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ | |
27 | (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ | |
28 | (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ | |
29 | (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ | |
30 | (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ | |
31 | (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) | |
32 | ||
33 | #define ___constant_swahw32(x) ((__u32)( \ | |
34 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ | |
35 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) | |
36 | ||
37 | #define ___constant_swahb32(x) ((__u32)( \ | |
38 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ | |
39 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) | |
40 | ||
41 | /* | |
42 | * Implement the following as inlines, but define the interface using | |
43 | * macros to allow constant folding when possible: | |
44 | * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 | |
45 | */ | |
46 | ||
47 | static inline __attribute_const__ __u16 __fswab16(__u16 val) | |
48 | { | |
7322dd75 | 49 | #if defined (__arch_swab16) |
607ca46e DH |
50 | return __arch_swab16(val); |
51 | #else | |
52 | return ___constant_swab16(val); | |
53 | #endif | |
54 | } | |
55 | ||
56 | static inline __attribute_const__ __u32 __fswab32(__u32 val) | |
57 | { | |
7322dd75 | 58 | #if defined(__arch_swab32) |
607ca46e DH |
59 | return __arch_swab32(val); |
60 | #else | |
61 | return ___constant_swab32(val); | |
62 | #endif | |
63 | } | |
64 | ||
65 | static inline __attribute_const__ __u64 __fswab64(__u64 val) | |
66 | { | |
7322dd75 | 67 | #if defined (__arch_swab64) |
607ca46e DH |
68 | return __arch_swab64(val); |
69 | #elif defined(__SWAB_64_THRU_32__) | |
70 | __u32 h = val >> 32; | |
71 | __u32 l = val & ((1ULL << 32) - 1); | |
72 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); | |
73 | #else | |
74 | return ___constant_swab64(val); | |
75 | #endif | |
76 | } | |
77 | ||
78 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) | |
79 | { | |
80 | #ifdef __arch_swahw32 | |
81 | return __arch_swahw32(val); | |
82 | #else | |
83 | return ___constant_swahw32(val); | |
84 | #endif | |
85 | } | |
86 | ||
87 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) | |
88 | { | |
89 | #ifdef __arch_swahb32 | |
90 | return __arch_swahb32(val); | |
91 | #else | |
92 | return ___constant_swahb32(val); | |
93 | #endif | |
94 | } | |
95 | ||
96 | /** | |
97 | * __swab16 - return a byteswapped 16-bit value | |
98 | * @x: value to byteswap | |
99 | */ | |
7322dd75 AB |
100 | #ifdef __HAVE_BUILTIN_BSWAP16__ |
101 | #define __swab16(x) (__u16)__builtin_bswap16((__u16)(x)) | |
102 | #else | |
607ca46e DH |
103 | #define __swab16(x) \ |
104 | (__builtin_constant_p((__u16)(x)) ? \ | |
105 | ___constant_swab16(x) : \ | |
106 | __fswab16(x)) | |
7322dd75 | 107 | #endif |
607ca46e DH |
108 | |
109 | /** | |
110 | * __swab32 - return a byteswapped 32-bit value | |
111 | * @x: value to byteswap | |
112 | */ | |
7322dd75 AB |
113 | #ifdef __HAVE_BUILTIN_BSWAP32__ |
114 | #define __swab32(x) (__u32)__builtin_bswap32((__u32)(x)) | |
115 | #else | |
607ca46e DH |
116 | #define __swab32(x) \ |
117 | (__builtin_constant_p((__u32)(x)) ? \ | |
118 | ___constant_swab32(x) : \ | |
119 | __fswab32(x)) | |
7322dd75 | 120 | #endif |
607ca46e DH |
121 | |
122 | /** | |
123 | * __swab64 - return a byteswapped 64-bit value | |
124 | * @x: value to byteswap | |
125 | */ | |
7322dd75 AB |
126 | #ifdef __HAVE_BUILTIN_BSWAP64__ |
127 | #define __swab64(x) (__u64)__builtin_bswap64((__u64)(x)) | |
128 | #else | |
607ca46e DH |
129 | #define __swab64(x) \ |
130 | (__builtin_constant_p((__u64)(x)) ? \ | |
131 | ___constant_swab64(x) : \ | |
132 | __fswab64(x)) | |
7322dd75 | 133 | #endif |
607ca46e DH |
134 | |
135 | /** | |
136 | * __swahw32 - return a word-swapped 32-bit value | |
137 | * @x: value to wordswap | |
138 | * | |
139 | * __swahw32(0x12340000) is 0x00001234 | |
140 | */ | |
141 | #define __swahw32(x) \ | |
142 | (__builtin_constant_p((__u32)(x)) ? \ | |
143 | ___constant_swahw32(x) : \ | |
144 | __fswahw32(x)) | |
145 | ||
146 | /** | |
147 | * __swahb32 - return a high and low byte-swapped 32-bit value | |
148 | * @x: value to byteswap | |
149 | * | |
150 | * __swahb32(0x12345678) is 0x34127856 | |
151 | */ | |
152 | #define __swahb32(x) \ | |
153 | (__builtin_constant_p((__u32)(x)) ? \ | |
154 | ___constant_swahb32(x) : \ | |
155 | __fswahb32(x)) | |
156 | ||
157 | /** | |
158 | * __swab16p - return a byteswapped 16-bit value from a pointer | |
159 | * @p: pointer to a naturally-aligned 16-bit value | |
160 | */ | |
bc27fb68 | 161 | static __always_inline __u16 __swab16p(const __u16 *p) |
607ca46e DH |
162 | { |
163 | #ifdef __arch_swab16p | |
164 | return __arch_swab16p(p); | |
165 | #else | |
166 | return __swab16(*p); | |
167 | #endif | |
168 | } | |
169 | ||
170 | /** | |
171 | * __swab32p - return a byteswapped 32-bit value from a pointer | |
172 | * @p: pointer to a naturally-aligned 32-bit value | |
173 | */ | |
bc27fb68 | 174 | static __always_inline __u32 __swab32p(const __u32 *p) |
607ca46e DH |
175 | { |
176 | #ifdef __arch_swab32p | |
177 | return __arch_swab32p(p); | |
178 | #else | |
179 | return __swab32(*p); | |
180 | #endif | |
181 | } | |
182 | ||
183 | /** | |
184 | * __swab64p - return a byteswapped 64-bit value from a pointer | |
185 | * @p: pointer to a naturally-aligned 64-bit value | |
186 | */ | |
bc27fb68 | 187 | static __always_inline __u64 __swab64p(const __u64 *p) |
607ca46e DH |
188 | { |
189 | #ifdef __arch_swab64p | |
190 | return __arch_swab64p(p); | |
191 | #else | |
192 | return __swab64(*p); | |
193 | #endif | |
194 | } | |
195 | ||
196 | /** | |
197 | * __swahw32p - return a wordswapped 32-bit value from a pointer | |
198 | * @p: pointer to a naturally-aligned 32-bit value | |
199 | * | |
200 | * See __swahw32() for details of wordswapping. | |
201 | */ | |
202 | static inline __u32 __swahw32p(const __u32 *p) | |
203 | { | |
204 | #ifdef __arch_swahw32p | |
205 | return __arch_swahw32p(p); | |
206 | #else | |
207 | return __swahw32(*p); | |
208 | #endif | |
209 | } | |
210 | ||
211 | /** | |
212 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer | |
213 | * @p: pointer to a naturally-aligned 32-bit value | |
214 | * | |
215 | * See __swahb32() for details of high/low byteswapping. | |
216 | */ | |
217 | static inline __u32 __swahb32p(const __u32 *p) | |
218 | { | |
219 | #ifdef __arch_swahb32p | |
220 | return __arch_swahb32p(p); | |
221 | #else | |
222 | return __swahb32(*p); | |
223 | #endif | |
224 | } | |
225 | ||
226 | /** | |
227 | * __swab16s - byteswap a 16-bit value in-place | |
228 | * @p: pointer to a naturally-aligned 16-bit value | |
229 | */ | |
230 | static inline void __swab16s(__u16 *p) | |
231 | { | |
232 | #ifdef __arch_swab16s | |
233 | __arch_swab16s(p); | |
234 | #else | |
235 | *p = __swab16p(p); | |
236 | #endif | |
237 | } | |
238 | /** | |
239 | * __swab32s - byteswap a 32-bit value in-place | |
240 | * @p: pointer to a naturally-aligned 32-bit value | |
241 | */ | |
bc27fb68 | 242 | static __always_inline void __swab32s(__u32 *p) |
607ca46e DH |
243 | { |
244 | #ifdef __arch_swab32s | |
245 | __arch_swab32s(p); | |
246 | #else | |
247 | *p = __swab32p(p); | |
248 | #endif | |
249 | } | |
250 | ||
251 | /** | |
252 | * __swab64s - byteswap a 64-bit value in-place | |
253 | * @p: pointer to a naturally-aligned 64-bit value | |
254 | */ | |
bc27fb68 | 255 | static __always_inline void __swab64s(__u64 *p) |
607ca46e DH |
256 | { |
257 | #ifdef __arch_swab64s | |
258 | __arch_swab64s(p); | |
259 | #else | |
260 | *p = __swab64p(p); | |
261 | #endif | |
262 | } | |
263 | ||
264 | /** | |
265 | * __swahw32s - wordswap a 32-bit value in-place | |
266 | * @p: pointer to a naturally-aligned 32-bit value | |
267 | * | |
268 | * See __swahw32() for details of wordswapping | |
269 | */ | |
270 | static inline void __swahw32s(__u32 *p) | |
271 | { | |
272 | #ifdef __arch_swahw32s | |
273 | __arch_swahw32s(p); | |
274 | #else | |
275 | *p = __swahw32p(p); | |
276 | #endif | |
277 | } | |
278 | ||
279 | /** | |
280 | * __swahb32s - high and low byteswap a 32-bit value in-place | |
281 | * @p: pointer to a naturally-aligned 32-bit value | |
282 | * | |
283 | * See __swahb32() for details of high and low byte swapping | |
284 | */ | |
285 | static inline void __swahb32s(__u32 *p) | |
286 | { | |
287 | #ifdef __arch_swahb32s | |
288 | __arch_swahb32s(p); | |
289 | #else | |
290 | *p = __swahb32p(p); | |
291 | #endif | |
292 | } | |
293 | ||
294 | ||
295 | #endif /* _UAPI_LINUX_SWAB_H */ |