]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_BITOPS_H |
2 | #define _LINUX_BITOPS_H | |
3 | #include <asm/types.h> | |
4 | ||
d05be13b | 5 | #ifdef __KERNEL__ |
93043ece | 6 | #define BIT(nr) (1UL << (nr)) |
d05be13b JS |
7 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) |
8 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) | |
14ed9d23 | 9 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_LONG) |
d05be13b JS |
10 | #define BITS_PER_BYTE 8 |
11 | #endif | |
12 | ||
1da177e4 LT |
13 | /* |
14 | * Include this here because some architectures need generic_ffs/fls in | |
15 | * scope | |
16 | */ | |
17 | #include <asm/bitops.h> | |
18 | ||
3e037454 SN |
19 | #define for_each_bit(bit, addr, size) \ |
20 | for ((bit) = find_first_bit((addr), (size)); \ | |
21 | (bit) < (size); \ | |
22 | (bit) = find_next_bit((addr), (size), (bit) + 1)) | |
23 | ||
24 | ||
1da177e4 LT |
25 | static __inline__ int get_bitmask_order(unsigned int count) |
26 | { | |
27 | int order; | |
28 | ||
29 | order = fls(count); | |
30 | return order; /* We could be slightly more clever with -1 here... */ | |
31 | } | |
32 | ||
94605eff SS |
33 | static __inline__ int get_count_order(unsigned int count) |
34 | { | |
35 | int order; | |
36 | ||
37 | order = fls(count) - 1; | |
38 | if (count & (count - 1)) | |
39 | order++; | |
40 | return order; | |
41 | } | |
42 | ||
1da177e4 LT |
43 | static inline unsigned long hweight_long(unsigned long w) |
44 | { | |
e9bebd6f | 45 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
1da177e4 LT |
46 | } |
47 | ||
45f8bde0 | 48 | /** |
1da177e4 | 49 | * rol32 - rotate a 32-bit value left |
1da177e4 LT |
50 | * @word: value to rotate |
51 | * @shift: bits to roll | |
52 | */ | |
53 | static inline __u32 rol32(__u32 word, unsigned int shift) | |
54 | { | |
55 | return (word << shift) | (word >> (32 - shift)); | |
56 | } | |
57 | ||
45f8bde0 | 58 | /** |
1da177e4 | 59 | * ror32 - rotate a 32-bit value right |
1da177e4 LT |
60 | * @word: value to rotate |
61 | * @shift: bits to roll | |
62 | */ | |
63 | static inline __u32 ror32(__u32 word, unsigned int shift) | |
64 | { | |
65 | return (word >> shift) | (word << (32 - shift)); | |
66 | } | |
67 | ||
962749af AM |
68 | static inline unsigned fls_long(unsigned long l) |
69 | { | |
70 | if (sizeof(l) == 4) | |
71 | return fls(l); | |
72 | return fls64(l); | |
73 | } | |
74 | ||
1da177e4 | 75 | #endif |