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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 */ |