projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ({ \ | |
| 970bddf9 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 | ({ \ | |
| 970bddf9 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 | ({ \ | |
| 970bddf9 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 | ({ \ | |
| 970bddf9 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 */ |