Commit | Line | Data |
---|---|---|
40c9f222 HH |
1 | #ifndef _LINUX_SWAB_H |
2 | #define _LINUX_SWAB_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #include <linux/compiler.h> | |
6 | #include <asm/byteorder.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 __const_swab16(x) ((__u16)( \ | |
13 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ | |
14 | (((__u16)(x) & (__u16)0xff00U) >> 8))) | |
15 | ||
16 | #define __const_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 __const_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 __const_swahw32(x) ((__u32)( \ | |
33 | (((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \ | |
34 | (((__u32)(x) & (__u32)0xffff0000UL) >> 16))) | |
35 | ||
36 | #define __const_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 ___swab16(__u16 val) | |
47 | { | |
48 | #ifdef __arch_swab16 | |
49 | return __arch_swab16(val); | |
50 | #elif defined(__arch_swab16p) | |
51 | return __arch_swab16p(&val); | |
52 | #else | |
53 | return __const_swab16(val); | |
54 | #endif | |
55 | } | |
56 | ||
57 | static inline __attribute_const__ __u32 ___swab32(__u32 val) | |
58 | { | |
59 | #ifdef __arch_swab32 | |
60 | return __arch_swab32(val); | |
61 | #elif defined(__arch_swab32p) | |
62 | return __arch_swab32p(&val); | |
63 | #else | |
64 | return __const_swab32(val); | |
65 | #endif | |
66 | } | |
67 | ||
68 | static inline __attribute_const__ __u64 ___swab64(__u64 val) | |
69 | { | |
70 | #ifdef __arch_swab64 | |
71 | return __arch_swab64(val); | |
72 | #elif defined(__arch_swab64p) | |
73 | return __arch_swab64p(&val); | |
74 | #elif defined(__SWAB_64_THRU_32__) | |
75 | __u32 h = val >> 32; | |
76 | __u32 l = val & ((1ULL << 32) - 1); | |
77 | return (((__u64)___swab32(l)) << 32) | ((__u64)(___swab32(h))); | |
78 | #else | |
79 | return __const_swab64(val); | |
80 | #endif | |
81 | } | |
82 | ||
83 | static inline __attribute_const__ __u32 ___swahw32(__u32 val) | |
84 | { | |
85 | #ifdef __arch_swahw32 | |
86 | return __arch_swahw32(val); | |
87 | #elif defined(__arch_swahw32p) | |
88 | return __arch_swahw32p(&val); | |
89 | #else | |
90 | return __const_swahw32(val); | |
91 | #endif | |
92 | } | |
93 | ||
94 | static inline __attribute_const__ __u32 ___swahb32(__u32 val) | |
95 | { | |
96 | #ifdef __arch_swahb32 | |
97 | return __arch_swahb32(val); | |
98 | #elif defined(__arch_swahb32p) | |
99 | return __arch_swahb32p(&val); | |
100 | #else | |
101 | return __const_swahb32(val); | |
102 | #endif | |
103 | } | |
104 | ||
105 | /** | |
106 | * __swab16 - return a byteswapped 16-bit value | |
107 | * @x: value to byteswap | |
108 | */ | |
109 | #define __swab16(x) \ | |
110 | (__builtin_constant_p((__u16)(x)) ? \ | |
111 | __const_swab16((x)) : \ | |
112 | ___swab16((x))) | |
113 | ||
114 | /** | |
115 | * __swab32 - return a byteswapped 32-bit value | |
116 | * @x: value to byteswap | |
117 | */ | |
118 | #define __swab32(x) \ | |
119 | (__builtin_constant_p((__u32)(x)) ? \ | |
120 | __const_swab32((x)) : \ | |
121 | ___swab32((x))) | |
122 | ||
123 | /** | |
124 | * __swab64 - return a byteswapped 64-bit value | |
125 | * @x: value to byteswap | |
126 | */ | |
127 | #define __swab64(x) \ | |
128 | (__builtin_constant_p((__u64)(x)) ? \ | |
129 | __const_swab64((x)) : \ | |
130 | ___swab64((x))) | |
131 | ||
132 | /** | |
133 | * __swahw32 - return a word-swapped 32-bit value | |
134 | * @x: value to wordswap | |
135 | * | |
136 | * __swahw32(0x12340000) is 0x00001234 | |
137 | */ | |
138 | #define __swahw32(x) \ | |
139 | (__builtin_constant_p((__u32)(x)) ? \ | |
140 | __const_swahw32((x)) : \ | |
141 | ___swahw32((x))) | |
142 | ||
143 | /** | |
144 | * __swahb32 - return a high and low byte-swapped 32-bit value | |
145 | * @x: value to byteswap | |
146 | * | |
147 | * __swahb32(0x12345678) is 0x34127856 | |
148 | */ | |
149 | #define __swahb32(x) \ | |
150 | (__builtin_constant_p((__u32)(x)) ? \ | |
151 | __const_swahb32((x)) : \ | |
152 | ___swahb32((x))) | |
153 | ||
154 | /** | |
155 | * __swab16p - return a byteswapped 16-bit value from a pointer | |
156 | * @p: pointer to a naturally-aligned 16-bit value | |
157 | */ | |
158 | static inline __u16 __swab16p(const __u16 *p) | |
159 | { | |
160 | #ifdef __arch_swab16p | |
161 | return __arch_swab16p(p); | |
162 | #else | |
163 | return __swab16(*p); | |
164 | #endif | |
165 | } | |
166 | ||
167 | /** | |
168 | * __swab32p - return a byteswapped 32-bit value from a pointer | |
169 | * @p: pointer to a naturally-aligned 32-bit value | |
170 | */ | |
171 | static inline __u32 __swab32p(const __u32 *p) | |
172 | { | |
173 | #ifdef __arch_swab32p | |
174 | return __arch_swab32p(p); | |
175 | #else | |
176 | return __swab32(*p); | |
177 | #endif | |
178 | } | |
179 | ||
180 | /** | |
181 | * __swab64p - return a byteswapped 64-bit value from a pointer | |
182 | * @p: pointer to a naturally-aligned 64-bit value | |
183 | */ | |
184 | static inline __u64 __swab64p(const __u64 *p) | |
185 | { | |
186 | #ifdef __arch_swab64p | |
187 | return __arch_swab64p(p); | |
188 | #else | |
189 | return __swab64(*p); | |
190 | #endif | |
191 | } | |
192 | ||
193 | /** | |
194 | * __swahw32p - return a wordswapped 32-bit value from a pointer | |
195 | * @p: pointer to a naturally-aligned 32-bit value | |
196 | * | |
197 | * See __swahw32() for details of wordswapping. | |
198 | */ | |
199 | static inline __u32 __swahw32p(const __u32 *p) | |
200 | { | |
201 | #ifdef __arch_swahw32p | |
202 | return __arch_swahw32p(p); | |
203 | #else | |
204 | return __swahw32(*p); | |
205 | #endif | |
206 | } | |
207 | ||
208 | /** | |
209 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer | |
210 | * @p: pointer to a naturally-aligned 32-bit value | |
211 | * | |
212 | * See __swahb32() for details of high/low byteswapping. | |
213 | */ | |
214 | static inline __u32 __swahb32p(const __u32 *p) | |
215 | { | |
216 | #ifdef __arch_swahb32p | |
217 | return __arch_swahb32p(p); | |
218 | #else | |
219 | return __swahb32(*p); | |
220 | #endif | |
221 | } | |
222 | ||
223 | /** | |
224 | * __swab16s - byteswap a 16-bit value in-place | |
225 | * @p: pointer to a naturally-aligned 16-bit value | |
226 | */ | |
227 | static inline void __swab16s(__u16 *p) | |
228 | { | |
229 | #ifdef __arch_swab16s | |
230 | __arch_swab16s(p); | |
231 | #else | |
232 | *p = __swab16p(p); | |
233 | #endif | |
234 | } | |
235 | /** | |
236 | * __swab32s - byteswap a 32-bit value in-place | |
237 | * @p: pointer to a naturally-aligned 32-bit value | |
238 | */ | |
239 | static inline void __swab32s(__u32 *p) | |
240 | { | |
241 | #ifdef __arch_swab32s | |
242 | __arch_swab32s(p); | |
243 | #else | |
244 | *p = __swab32p(p); | |
245 | #endif | |
246 | } | |
247 | ||
248 | /** | |
249 | * __swab64s - byteswap a 64-bit value in-place | |
250 | * @p: pointer to a naturally-aligned 64-bit value | |
251 | */ | |
252 | static inline void __swab64s(__u64 *p) | |
253 | { | |
254 | #ifdef __arch_swab64s | |
255 | __arch_swab64s(p); | |
256 | #else | |
257 | *p = __swab64p(p); | |
258 | #endif | |
259 | } | |
260 | ||
261 | /** | |
262 | * __swahw32s - wordswap a 32-bit value in-place | |
263 | * @p: pointer to a naturally-aligned 32-bit value | |
264 | * | |
265 | * See __swahw32() for details of wordswapping | |
266 | */ | |
267 | static inline void __swahw32s(__u32 *p) | |
268 | { | |
269 | #ifdef __arch_swahw32s | |
270 | __arch_swahw32s(p); | |
271 | #else | |
272 | *p = __swahw32p(p); | |
273 | #endif | |
274 | } | |
275 | ||
276 | /** | |
277 | * __swahb32s - high and low byteswap a 32-bit value in-place | |
278 | * @p: pointer to a naturally-aligned 32-bit value | |
279 | * | |
280 | * See __swahb32() for details of high and low byte swapping | |
281 | */ | |
282 | static inline void __swahb32s(__u32 *p) | |
283 | { | |
284 | #ifdef __arch_swahb32s | |
285 | __arch_swahb32s(p); | |
286 | #else | |
287 | *p = __swahb32p(p); | |
288 | #endif | |
289 | } | |
290 | ||
291 | #ifdef __KERNEL__ | |
292 | # define swab16 __swab16 | |
293 | # define swab32 __swab32 | |
294 | # define swab64 __swab64 | |
295 | # define swahw32 __swahw32 | |
296 | # define swahb32 __swahb32 | |
297 | # define swab16p __swab16p | |
298 | # define swab32p __swab32p | |
299 | # define swab64p __swab64p | |
300 | # define swahw32p __swahw32p | |
301 | # define swahb32p __swahb32p | |
302 | # define swab16s __swab16s | |
303 | # define swab32s __swab32s | |
304 | # define swab64s __swab64s | |
305 | # define swahw32s __swahw32s | |
306 | # define swahb32s __swahb32s | |
307 | #endif /* __KERNEL__ */ | |
308 | ||
309 | #endif /* _LINUX_SWAB_H */ |