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1da177e4 LT |
1 | #ifndef _LINUX_BITOPS_H |
2 | #define _LINUX_BITOPS_H | |
3 | #include <asm/types.h> | |
4 | ||
1da177e4 LT |
5 | /* |
6 | * Include this here because some architectures need generic_ffs/fls in | |
7 | * scope | |
8 | */ | |
9 | #include <asm/bitops.h> | |
10 | ||
11 | static __inline__ int get_bitmask_order(unsigned int count) | |
12 | { | |
13 | int order; | |
14 | ||
15 | order = fls(count); | |
16 | return order; /* We could be slightly more clever with -1 here... */ | |
17 | } | |
18 | ||
94605eff SS |
19 | static __inline__ int get_count_order(unsigned int count) |
20 | { | |
21 | int order; | |
22 | ||
23 | order = fls(count) - 1; | |
24 | if (count & (count - 1)) | |
25 | order++; | |
26 | return order; | |
27 | } | |
28 | ||
1da177e4 LT |
29 | static inline unsigned long hweight_long(unsigned long w) |
30 | { | |
e9bebd6f | 31 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
1da177e4 LT |
32 | } |
33 | ||
45f8bde0 | 34 | /** |
1da177e4 | 35 | * rol32 - rotate a 32-bit value left |
1da177e4 LT |
36 | * @word: value to rotate |
37 | * @shift: bits to roll | |
38 | */ | |
39 | static inline __u32 rol32(__u32 word, unsigned int shift) | |
40 | { | |
41 | return (word << shift) | (word >> (32 - shift)); | |
42 | } | |
43 | ||
45f8bde0 | 44 | /** |
1da177e4 | 45 | * ror32 - rotate a 32-bit value right |
1da177e4 LT |
46 | * @word: value to rotate |
47 | * @shift: bits to roll | |
48 | */ | |
49 | static inline __u32 ror32(__u32 word, unsigned int shift) | |
50 | { | |
51 | return (word >> shift) | (word << (32 - shift)); | |
52 | } | |
53 | ||
962749af AM |
54 | static inline unsigned fls_long(unsigned long l) |
55 | { | |
56 | if (sizeof(l) == 4) | |
57 | return fls(l); | |
58 | return fls64(l); | |
59 | } | |
60 | ||
1da177e4 | 61 | #endif |