Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
a5cfc1ec AM |
2 | #ifndef _LINUX_BITREV_H |
3 | #define _LINUX_BITREV_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | ||
556d2f05 YW |
7 | #ifdef CONFIG_HAVE_ARCH_BITREVERSE |
8 | #include <asm/bitrev.h> | |
9 | ||
10 | #define __bitrev32 __arch_bitrev32 | |
11 | #define __bitrev16 __arch_bitrev16 | |
12 | #define __bitrev8 __arch_bitrev8 | |
a5cfc1ec | 13 | |
556d2f05 YW |
14 | #else |
15 | extern u8 const byte_rev_table[256]; | |
16 | static inline u8 __bitrev8(u8 byte) | |
a5cfc1ec AM |
17 | { |
18 | return byte_rev_table[byte]; | |
19 | } | |
20 | ||
556d2f05 YW |
21 | static inline u16 __bitrev16(u16 x) |
22 | { | |
23 | return (__bitrev8(x & 0xff) << 8) | __bitrev8(x >> 8); | |
24 | } | |
25 | ||
26 | static inline u32 __bitrev32(u32 x) | |
27 | { | |
28 | return (__bitrev16(x & 0xffff) << 16) | __bitrev16(x >> 16); | |
29 | } | |
30 | ||
31 | #endif /* CONFIG_HAVE_ARCH_BITREVERSE */ | |
32 | ||
3b88da4a JC |
33 | #define __bitrev8x4(x) (__bitrev32(swab32(x))) |
34 | ||
556d2f05 YW |
35 | #define __constant_bitrev32(x) \ |
36 | ({ \ | |
6147e136 AB |
37 | u32 ___x = x; \ |
38 | ___x = (___x >> 16) | (___x << 16); \ | |
39 | ___x = ((___x & (u32)0xFF00FF00UL) >> 8) | ((___x & (u32)0x00FF00FFUL) << 8); \ | |
40 | ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \ | |
41 | ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \ | |
42 | ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \ | |
43 | ___x; \ | |
556d2f05 YW |
44 | }) |
45 | ||
46 | #define __constant_bitrev16(x) \ | |
47 | ({ \ | |
6147e136 AB |
48 | u16 ___x = x; \ |
49 | ___x = (___x >> 8) | (___x << 8); \ | |
50 | ___x = ((___x & (u16)0xF0F0U) >> 4) | ((___x & (u16)0x0F0FU) << 4); \ | |
51 | ___x = ((___x & (u16)0xCCCCU) >> 2) | ((___x & (u16)0x3333U) << 2); \ | |
52 | ___x = ((___x & (u16)0xAAAAU) >> 1) | ((___x & (u16)0x5555U) << 1); \ | |
53 | ___x; \ | |
556d2f05 YW |
54 | }) |
55 | ||
3b88da4a JC |
56 | #define __constant_bitrev8x4(x) \ |
57 | ({ \ | |
6147e136 AB |
58 | u32 ___x = x; \ |
59 | ___x = ((___x & (u32)0xF0F0F0F0UL) >> 4) | ((___x & (u32)0x0F0F0F0FUL) << 4); \ | |
60 | ___x = ((___x & (u32)0xCCCCCCCCUL) >> 2) | ((___x & (u32)0x33333333UL) << 2); \ | |
61 | ___x = ((___x & (u32)0xAAAAAAAAUL) >> 1) | ((___x & (u32)0x55555555UL) << 1); \ | |
62 | ___x; \ | |
3b88da4a JC |
63 | }) |
64 | ||
556d2f05 YW |
65 | #define __constant_bitrev8(x) \ |
66 | ({ \ | |
6147e136 AB |
67 | u8 ___x = x; \ |
68 | ___x = (___x >> 4) | (___x << 4); \ | |
69 | ___x = ((___x & (u8)0xCCU) >> 2) | ((___x & (u8)0x33U) << 2); \ | |
70 | ___x = ((___x & (u8)0xAAU) >> 1) | ((___x & (u8)0x55U) << 1); \ | |
71 | ___x; \ | |
556d2f05 YW |
72 | }) |
73 | ||
74 | #define bitrev32(x) \ | |
75 | ({ \ | |
76 | u32 __x = x; \ | |
77 | __builtin_constant_p(__x) ? \ | |
78 | __constant_bitrev32(__x) : \ | |
79 | __bitrev32(__x); \ | |
80 | }) | |
81 | ||
82 | #define bitrev16(x) \ | |
83 | ({ \ | |
84 | u16 __x = x; \ | |
85 | __builtin_constant_p(__x) ? \ | |
86 | __constant_bitrev16(__x) : \ | |
87 | __bitrev16(__x); \ | |
88 | }) | |
a5cfc1ec | 89 | |
3b88da4a JC |
90 | #define bitrev8x4(x) \ |
91 | ({ \ | |
92 | u32 __x = x; \ | |
93 | __builtin_constant_p(__x) ? \ | |
94 | __constant_bitrev8x4(__x) : \ | |
95 | __bitrev8x4(__x); \ | |
96 | }) | |
97 | ||
556d2f05 YW |
98 | #define bitrev8(x) \ |
99 | ({ \ | |
100 | u8 __x = x; \ | |
101 | __builtin_constant_p(__x) ? \ | |
102 | __constant_bitrev8(__x) : \ | |
103 | __bitrev8(__x) ; \ | |
104 | }) | |
a5cfc1ec | 105 | #endif /* _LINUX_BITREV_H */ |