Root/
1 | #ifndef _LINUX_SWAB_H |
2 | #define _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 | { |
48 | #ifdef __arch_swab16 |
49 | return __arch_swab16(val); |
50 | #else |
51 | return ___constant_swab16(val); |
52 | #endif |
53 | } |
54 | |
55 | static inline __attribute_const__ __u32 __fswab32(__u32 val) |
56 | { |
57 | #ifdef __arch_swab32 |
58 | return __arch_swab32(val); |
59 | #else |
60 | return ___constant_swab32(val); |
61 | #endif |
62 | } |
63 | |
64 | static inline __attribute_const__ __u64 __fswab64(__u64 val) |
65 | { |
66 | #ifdef __arch_swab64 |
67 | return __arch_swab64(val); |
68 | #elif defined(__SWAB_64_THRU_32__) |
69 | __u32 h = val >> 32; |
70 | __u32 l = val & ((1ULL << 32) - 1); |
71 | return (((__u64)__fswab32(l)) << 32) | ((__u64)(__fswab32(h))); |
72 | #else |
73 | return ___constant_swab64(val); |
74 | #endif |
75 | } |
76 | |
77 | static inline __attribute_const__ __u32 __fswahw32(__u32 val) |
78 | { |
79 | #ifdef __arch_swahw32 |
80 | return __arch_swahw32(val); |
81 | #else |
82 | return ___constant_swahw32(val); |
83 | #endif |
84 | } |
85 | |
86 | static inline __attribute_const__ __u32 __fswahb32(__u32 val) |
87 | { |
88 | #ifdef __arch_swahb32 |
89 | return __arch_swahb32(val); |
90 | #else |
91 | return ___constant_swahb32(val); |
92 | #endif |
93 | } |
94 | |
95 | /** |
96 | * __swab16 - return a byteswapped 16-bit value |
97 | * @x: value to byteswap |
98 | */ |
99 | #define __swab16(x) \ |
100 | (__builtin_constant_p((__u16)(x)) ? \ |
101 | ___constant_swab16(x) : \ |
102 | __fswab16(x)) |
103 | |
104 | /** |
105 | * __swab32 - return a byteswapped 32-bit value |
106 | * @x: value to byteswap |
107 | */ |
108 | #define __swab32(x) \ |
109 | (__builtin_constant_p((__u32)(x)) ? \ |
110 | ___constant_swab32(x) : \ |
111 | __fswab32(x)) |
112 | |
113 | /** |
114 | * __swab64 - return a byteswapped 64-bit value |
115 | * @x: value to byteswap |
116 | */ |
117 | #define __swab64(x) \ |
118 | (__builtin_constant_p((__u64)(x)) ? \ |
119 | ___constant_swab64(x) : \ |
120 | __fswab64(x)) |
121 | |
122 | /** |
123 | * __swahw32 - return a word-swapped 32-bit value |
124 | * @x: value to wordswap |
125 | * |
126 | * __swahw32(0x12340000) is 0x00001234 |
127 | */ |
128 | #define __swahw32(x) \ |
129 | (__builtin_constant_p((__u32)(x)) ? \ |
130 | ___constant_swahw32(x) : \ |
131 | __fswahw32(x)) |
132 | |
133 | /** |
134 | * __swahb32 - return a high and low byte-swapped 32-bit value |
135 | * @x: value to byteswap |
136 | * |
137 | * __swahb32(0x12345678) is 0x34127856 |
138 | */ |
139 | #define __swahb32(x) \ |
140 | (__builtin_constant_p((__u32)(x)) ? \ |
141 | ___constant_swahb32(x) : \ |
142 | __fswahb32(x)) |
143 | |
144 | /** |
145 | * __swab16p - return a byteswapped 16-bit value from a pointer |
146 | * @p: pointer to a naturally-aligned 16-bit value |
147 | */ |
148 | static inline __u16 __swab16p(const __u16 *p) |
149 | { |
150 | #ifdef __arch_swab16p |
151 | return __arch_swab16p(p); |
152 | #else |
153 | return __swab16(*p); |
154 | #endif |
155 | } |
156 | |
157 | /** |
158 | * __swab32p - return a byteswapped 32-bit value from a pointer |
159 | * @p: pointer to a naturally-aligned 32-bit value |
160 | */ |
161 | static inline __u32 __swab32p(const __u32 *p) |
162 | { |
163 | #ifdef __arch_swab32p |
164 | return __arch_swab32p(p); |
165 | #else |
166 | return __swab32(*p); |
167 | #endif |
168 | } |
169 | |
170 | /** |
171 | * __swab64p - return a byteswapped 64-bit value from a pointer |
172 | * @p: pointer to a naturally-aligned 64-bit value |
173 | */ |
174 | static inline __u64 __swab64p(const __u64 *p) |
175 | { |
176 | #ifdef __arch_swab64p |
177 | return __arch_swab64p(p); |
178 | #else |
179 | return __swab64(*p); |
180 | #endif |
181 | } |
182 | |
183 | /** |
184 | * __swahw32p - return a wordswapped 32-bit value from a pointer |
185 | * @p: pointer to a naturally-aligned 32-bit value |
186 | * |
187 | * See __swahw32() for details of wordswapping. |
188 | */ |
189 | static inline __u32 __swahw32p(const __u32 *p) |
190 | { |
191 | #ifdef __arch_swahw32p |
192 | return __arch_swahw32p(p); |
193 | #else |
194 | return __swahw32(*p); |
195 | #endif |
196 | } |
197 | |
198 | /** |
199 | * __swahb32p - return a high and low byteswapped 32-bit value from a pointer |
200 | * @p: pointer to a naturally-aligned 32-bit value |
201 | * |
202 | * See __swahb32() for details of high/low byteswapping. |
203 | */ |
204 | static inline __u32 __swahb32p(const __u32 *p) |
205 | { |
206 | #ifdef __arch_swahb32p |
207 | return __arch_swahb32p(p); |
208 | #else |
209 | return __swahb32(*p); |
210 | #endif |
211 | } |
212 | |
213 | /** |
214 | * __swab16s - byteswap a 16-bit value in-place |
215 | * @p: pointer to a naturally-aligned 16-bit value |
216 | */ |
217 | static inline void __swab16s(__u16 *p) |
218 | { |
219 | #ifdef __arch_swab16s |
220 | __arch_swab16s(p); |
221 | #else |
222 | *p = __swab16p(p); |
223 | #endif |
224 | } |
225 | /** |
226 | * __swab32s - byteswap a 32-bit value in-place |
227 | * @p: pointer to a naturally-aligned 32-bit value |
228 | */ |
229 | static inline void __swab32s(__u32 *p) |
230 | { |
231 | #ifdef __arch_swab32s |
232 | __arch_swab32s(p); |
233 | #else |
234 | *p = __swab32p(p); |
235 | #endif |
236 | } |
237 | |
238 | /** |
239 | * __swab64s - byteswap a 64-bit value in-place |
240 | * @p: pointer to a naturally-aligned 64-bit value |
241 | */ |
242 | static inline void __swab64s(__u64 *p) |
243 | { |
244 | #ifdef __arch_swab64s |
245 | __arch_swab64s(p); |
246 | #else |
247 | *p = __swab64p(p); |
248 | #endif |
249 | } |
250 | |
251 | /** |
252 | * __swahw32s - wordswap a 32-bit value in-place |
253 | * @p: pointer to a naturally-aligned 32-bit value |
254 | * |
255 | * See __swahw32() for details of wordswapping |
256 | */ |
257 | static inline void __swahw32s(__u32 *p) |
258 | { |
259 | #ifdef __arch_swahw32s |
260 | __arch_swahw32s(p); |
261 | #else |
262 | *p = __swahw32p(p); |
263 | #endif |
264 | } |
265 | |
266 | /** |
267 | * __swahb32s - high and low byteswap a 32-bit value in-place |
268 | * @p: pointer to a naturally-aligned 32-bit value |
269 | * |
270 | * See __swahb32() for details of high and low byte swapping |
271 | */ |
272 | static inline void __swahb32s(__u32 *p) |
273 | { |
274 | #ifdef __arch_swahb32s |
275 | __arch_swahb32s(p); |
276 | #else |
277 | *p = __swahb32p(p); |
278 | #endif |
279 | } |
280 | |
281 | #ifdef __KERNEL__ |
282 | # define swab16 __swab16 |
283 | # define swab32 __swab32 |
284 | # define swab64 __swab64 |
285 | # define swahw32 __swahw32 |
286 | # define swahb32 __swahb32 |
287 | # define swab16p __swab16p |
288 | # define swab32p __swab32p |
289 | # define swab64p __swab64p |
290 | # define swahw32p __swahw32p |
291 | # define swahb32p __swahb32p |
292 | # define swab16s __swab16s |
293 | # define swab32s __swab32s |
294 | # define swab64s __swab64s |
295 | # define swahw32s __swahw32s |
296 | # define swahb32s __swahb32s |
297 | #endif /* __KERNEL__ */ |
298 | |
299 | #endif /* _LINUX_SWAB_H */ |
300 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9