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