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607ca46e DH |
1 | #ifndef _UAPI_LINUX_SWAB_H |
2 | #define _UAPI_LINUX_SWAB_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/compiler.h> | |
6 | #include <asm/swab.h> | |
7 | ||
8 | /* | |
9 | * casts are necessary for constants, because we never know how for sure | |
10 | * how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way. | |
11 | */ | |
12 | #define ___constant_swab16(x) ((__u16)( \ | |
13 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ | |
14 | (((__u16)(x) & (__u16)0xff00U) >> 8))) | |
15 | ||
16 | #define ___constant_swab32(x) ((__u32)( \ | |
17 | (((__u32)(x) & (__u32)0x000000ffUL) << 24) | \ | |
18 | (((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \ | |
19 | (((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \ | |
20 | (((__u32)(x) & (__u32)0xff000000UL) >> 24))) | |
21 | ||
22 | #define ___constant_swab64(x) ((__u64)( \ | |
23 | (((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \ | |
24 | (((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \ | |
25 | (((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \ | |
26 | (((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \ | |
27 | (((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \ | |
28 | (((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \ | |
29 | (((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \ | |
30 | (((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56))) | |
31 | ||
32 | #define ___constant_swahw32(x) ((__u32)( \ | |
33 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ | |
34 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) | |
35 | ||
36 | #define ___constant_swahb32(x) ((__u32)( \ | |
37 | (((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \ | |
38 | (((__u32)(x) & (__u32)0xff00ff00UL) >> 8))) | |
39 | ||
40 | /* | |
41 | * Implement the following as inlines, but define the interface using | |
42 | * macros to allow constant folding when possible: | |
43 | * ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32 | |
44 | */ | |
45 | ||
46 | static inline __attribute_const__ __u16 __fswab16(__u16 val) | |
47 | { | |
cf66bb93 DW |
48 | #ifdef __HAVE_BUILTIN_BSWAP16__ |
49 | return __builtin_bswap16(val); | |
50 | #elif 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 | { | |
cf66bb93 DW |
59 | #ifdef __HAVE_BUILTIN_BSWAP32__ |
60 | return __builtin_bswap32(val); | |
61 | #elif defined(__arch_swab32) | |
607ca46e DH |
62 | return __arch_swab32(val); |
63 | #else | |
64 | return ___constant_swab32(val); | |
65 | #endif | |
66 | } | |
67 | ||
68 | static inline __attribute_const__ __u64 __fswab64(__u64 val) | |
69 | { | |
cf66bb93 DW |
70 | #ifdef __HAVE_BUILTIN_BSWAP64__ |
71 | return __builtin_bswap64(val); | |
72 | #elif defined (__arch_swab64) | |
607ca46e DH |
73 | return __arch_swab64(val); |
74 | #elif defined(__SWAB_64_THRU_32__) | |
75 | __u32 h = val >> 32; | |
76 | __u32 l = val & ((1ULL << 32) - 1); | |
77 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); | |
78 | #else | |
79 | return ___constant_swab64(val); | |
80 | #endif | |
81 | } | |
82 | ||
83 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) | |
84 | { | |
85 | #ifdef __arch_swahw32 | |
86 | return __arch_swahw32(val); | |
87 | #else | |
88 | return ___constant_swahw32(val); | |
89 | #endif | |
90 | } | |
91 | ||
92 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) | |
93 | { | |
94 | #ifdef __arch_swahb32 | |
95 | return __arch_swahb32(val); | |
96 | #else | |
97 | return ___constant_swahb32(val); | |
98 | #endif | |
99 | } | |
100 | ||
101 | /** | |
102 | * __swab16 - return a byteswapped 16-bit value | |
103 | * @x: value to byteswap | |
104 | */ | |
105 | #define __swab16(x) \ | |
106 | (__builtin_constant_p((__u16)(x)) ? \ | |
107 | ___constant_swab16(x) : \ | |
108 | __fswab16(x)) | |
109 | ||
110 | /** | |
111 | * __swab32 - return a byteswapped 32-bit value | |
112 | * @x: value to byteswap | |
113 | */ | |
114 | #define __swab32(x) \ | |
115 | (__builtin_constant_p((__u32)(x)) ? \ | |
116 | ___constant_swab32(x) : \ | |
117 | __fswab32(x)) | |
118 | ||
119 | /** | |
120 | * __swab64 - return a byteswapped 64-bit value | |
121 | * @x: value to byteswap | |
122 | */ | |
123 | #define __swab64(x) \ | |
124 | (__builtin_constant_p((__u64)(x)) ? \ | |
125 | ___constant_swab64(x) : \ | |
126 | __fswab64(x)) | |
127 | ||
128 | /** | |
129 | * __swahw32 - return a word-swapped 32-bit value | |
130 | * @x: value to wordswap | |
131 | * | |
132 | * __swahw32(0x12340000) is 0x00001234 | |
133 | */ | |
134 | #define __swahw32(x) \ | |
135 | (__builtin_constant_p((__u32)(x)) ? \ | |
136 | ___constant_swahw32(x) : \ | |
137 | __fswahw32(x)) | |
138 | ||
139 | /** | |
140 | * __swahb32 - return a high and low byte-swapped 32-bit value | |
141 | * @x: value to byteswap | |
142 | * | |
143 | * __swahb32(0x12345678) is 0x34127856 | |
144 | */ | |
145 | #define __swahb32(x) \ | |
146 | (__builtin_constant_p((__u32)(x)) ? \ | |
147 | ___constant_swahb32(x) : \ | |
148 | __fswahb32(x)) | |
149 | ||
150 | /** | |
151 | * __swab16p - return a byteswapped 16-bit value from a pointer | |
152 | * @p: pointer to a naturally-aligned 16-bit value | |
153 | */ | |
154 | static inline __u16 __swab16p(const __u16 *p) | |
155 | { | |
156 | #ifdef __arch_swab16p | |
157 | return __arch_swab16p(p); | |
158 | #else | |
159 | return __swab16(*p); | |
160 | #endif | |
161 | } | |
162 | ||
163 | /** | |
164 | * __swab32p - return a byteswapped 32-bit value from a pointer | |
165 | * @p: pointer to a naturally-aligned 32-bit value | |
166 | */ | |
167 | static inline __u32 __swab32p(const __u32 *p) | |
168 | { | |
169 | #ifdef __arch_swab32p | |
170 | return __arch_swab32p(p); | |
171 | #else | |
172 | return __swab32(*p); | |
173 | #endif | |
174 | } | |
175 | ||
176 | /** | |
177 | * __swab64p - return a byteswapped 64-bit value from a pointer | |
178 | * @p: pointer to a naturally-aligned 64-bit value | |
179 | */ | |
180 | static inline __u64 __swab64p(const __u64 *p) | |
181 | { | |
182 | #ifdef __arch_swab64p | |
183 | return __arch_swab64p(p); | |
184 | #else | |
185 | return __swab64(*p); | |
186 | #endif | |
187 | } | |
188 | ||
189 | /** | |
190 | * __swahw32p - return a wordswapped 32-bit value from a pointer | |
191 | * @p: pointer to a naturally-aligned 32-bit value | |
192 | * | |
193 | * See __swahw32() for details of wordswapping. | |
194 | */ | |
195 | static inline __u32 __swahw32p(const __u32 *p) | |
196 | { | |
197 | #ifdef __arch_swahw32p | |
198 | return __arch_swahw32p(p); | |
199 | #else | |
200 | return __swahw32(*p); | |
201 | #endif | |
202 | } | |
203 | ||
204 | /** | |
205 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer | |
206 | * @p: pointer to a naturally-aligned 32-bit value | |
207 | * | |
208 | * See __swahb32() for details of high/low byteswapping. | |
209 | */ | |
210 | static inline __u32 __swahb32p(const __u32 *p) | |
211 | { | |
212 | #ifdef __arch_swahb32p | |
213 | return __arch_swahb32p(p); | |
214 | #else | |
215 | return __swahb32(*p); | |
216 | #endif | |
217 | } | |
218 | ||
219 | /** | |
220 | * __swab16s - byteswap a 16-bit value in-place | |
221 | * @p: pointer to a naturally-aligned 16-bit value | |
222 | */ | |
223 | static inline void __swab16s(__u16 *p) | |
224 | { | |
225 | #ifdef __arch_swab16s | |
226 | __arch_swab16s(p); | |
227 | #else | |
228 | *p = __swab16p(p); | |
229 | #endif | |
230 | } | |
231 | /** | |
232 | * __swab32s - byteswap a 32-bit value in-place | |
233 | * @p: pointer to a naturally-aligned 32-bit value | |
234 | */ | |
235 | static inline void __swab32s(__u32 *p) | |
236 | { | |
237 | #ifdef __arch_swab32s | |
238 | __arch_swab32s(p); | |
239 | #else | |
240 | *p = __swab32p(p); | |
241 | #endif | |
242 | } | |
243 | ||
244 | /** | |
245 | * __swab64s - byteswap a 64-bit value in-place | |
246 | * @p: pointer to a naturally-aligned 64-bit value | |
247 | */ | |
248 | static inline void __swab64s(__u64 *p) | |
249 | { | |
250 | #ifdef __arch_swab64s | |
251 | __arch_swab64s(p); | |
252 | #else | |
253 | *p = __swab64p(p); | |
254 | #endif | |
255 | } | |
256 | ||
257 | /** | |
258 | * __swahw32s - wordswap a 32-bit value in-place | |
259 | * @p: pointer to a naturally-aligned 32-bit value | |
260 | * | |
261 | * See __swahw32() for details of wordswapping | |
262 | */ | |
263 | static inline void __swahw32s(__u32 *p) | |
264 | { | |
265 | #ifdef __arch_swahw32s | |
266 | __arch_swahw32s(p); | |
267 | #else | |
268 | *p = __swahw32p(p); | |
269 | #endif | |
270 | } | |
271 | ||
272 | /** | |
273 | * __swahb32s - high and low byteswap a 32-bit value in-place | |
274 | * @p: pointer to a naturally-aligned 32-bit value | |
275 | * | |
276 | * See __swahb32() for details of high and low byte swapping | |
277 | */ | |
278 | static inline void __swahb32s(__u32 *p) | |
279 | { | |
280 | #ifdef __arch_swahb32s | |
281 | __arch_swahb32s(p); | |
282 | #else | |
283 | *p = __swahb32p(p); | |
284 | #endif | |
285 | } | |
286 | ||
287 | ||
288 | #endif /* _UAPI_LINUX_SWAB_H */ |