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