1 #ifndef _LINUX_BITOPS_H
2 #define _LINUX_BITOPS_H
3 #include <asm/types.h>
4
5 #ifdef __KERNEL__
6 #define BIT(nr) (1UL << (nr))
7 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
8 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
9 #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_LONG)
10 #define BITS_PER_BYTE 8
11 #endif
12
13 /*
14 * Include this here because some architectures need generic_ffs/fls in
15 * scope
16 */
17 #include <asm/bitops.h>
18
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
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
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
43 static inline unsigned long hweight_long(unsigned long w)
44 {
45 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
46 }
47
48 /**
49 * rol32 - rotate a 32-bit value left
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
58 /**
59 * ror32 - rotate a 32-bit value right
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
68 /**
69 * rol16 - rotate a 16-bit value left
70 * @word: value to rotate
71 * @shift: bits to roll
72 */
73 static inline __u16 rol16(__u16 word, unsigned int shift)
74 {
75 return (word << shift) | (word >> (16 - shift));
76 }
77
78 /**
79 * ror16 - rotate a 16-bit value right
80 * @word: value to rotate
81 * @shift: bits to roll
82 */
83 static inline __u16 ror16(__u16 word, unsigned int shift)
84 {
85 return (word >> shift) | (word << (16 - shift));
86 }
87
88 /**
89 * rol8 - rotate an 8-bit value left
90 * @word: value to rotate
91 * @shift: bits to roll
92 */
93 static inline __u8 rol8(__u8 word, unsigned int shift)
94 {
95 return (word << shift) | (word >> (8 - shift));
96 }
97
98 /**
99 * ror8 - rotate an 8-bit value right
100 * @word: value to rotate
101 * @shift: bits to roll
102 */
103 static inline __u8 ror8(__u8 word, unsigned int shift)
104 {
105 return (word >> shift) | (word << (8 - shift));
106 }
107
108 static inline unsigned fls_long(unsigned long l)
109 {
110 if (sizeof(l) == 4)
111 return fls(l);
112 return fls64(l);
113 }
114
115 #endif
116
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