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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef _LINUX_SWAB_H
3#define _LINUX_SWAB_H
4
5#include <linux/types.h>
6
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
47static __inline__ __u16 __fswab16(__u16 val)
48{
49#if defined (__arch_swab16)
50 return __arch_swab16(val);
51#else
52 return ___constant_swab16(val);
53#endif
54}
55
56static __inline__ __u32 __fswab32(__u32 val)
57{
58#if defined(__arch_swab32)
59 return __arch_swab32(val);
60#else
61 return ___constant_swab32(val);
62#endif
63}
64
65static __inline__ __u64 __fswab64(__u64 val)
66{
67#if defined (__arch_swab64)
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
78static __inline__ __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
87static __inline__ __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 */
100#ifdef __HAVE_BUILTIN_BSWAP16__
101#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
102#else
103#define __swab16(x) \
104 (__builtin_constant_p((__u16)(x)) ? \
105 ___constant_swab16(x) : \
106 __fswab16(x))
107#endif
108
109/**
110 * __swab32 - return a byteswapped 32-bit value
111 * @x: value to byteswap
112 */
113#ifdef __HAVE_BUILTIN_BSWAP32__
114#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
115#else
116#define __swab32(x) \
117 (__builtin_constant_p((__u32)(x)) ? \
118 ___constant_swab32(x) : \
119 __fswab32(x))
120#endif
121
122/**
123 * __swab64 - return a byteswapped 64-bit value
124 * @x: value to byteswap
125 */
126#ifdef __HAVE_BUILTIN_BSWAP64__
127#define __swab64(x) (__u64)__builtin_bswap64((__u64)(x))
128#else
129#define __swab64(x) \
130 (__builtin_constant_p((__u64)(x)) ? \
131 ___constant_swab64(x) : \
132 __fswab64(x))
133#endif
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 */
161static __always_inline __u16 __swab16p(const __u16 *p)
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 */
174static __always_inline __u32 __swab32p(const __u32 *p)
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 */
187static __always_inline __u64 __swab64p(const __u64 *p)
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 */
202static __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 */
217static __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 */
230static __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 */
242static __always_inline void __swab32s(__u32 *p)
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 */
255static __always_inline void __swab64s(__u64 *p)
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 */
270static __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 */
285static __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 /* _LINUX_SWAB_H */
296

Warning: That file was not part of the compilation database. It may have many parsing errors.