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_ULL(nr) (1ULL << (nr))
8#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
9#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
10#define BIT_ULL_MASK(nr) (1ULL << ((nr) % BITS_PER_LONG_LONG))
11#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
12#define BITS_PER_BYTE 8
13#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
14#endif
15
16
17
18
19
20
21#define GENMASK(h, l) \
22 (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
23
24#define GENMASK_ULL(h, l) \
25 (((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
26
27extern unsigned int __sw_hweight8(unsigned int w);
28extern unsigned int __sw_hweight16(unsigned int w);
29extern unsigned int __sw_hweight32(unsigned int w);
30extern unsigned long __sw_hweight64(__u64 w);
31
32
33
34
35
36#include <asm/bitops.h>
37
38#define for_each_set_bit(bit, addr, size) \
39 for ((bit) = find_first_bit((addr), (size)); \
40 (bit) < (size); \
41 (bit) = find_next_bit((addr), (size), (bit) + 1))
42
43
44#define for_each_set_bit_from(bit, addr, size) \
45 for ((bit) = find_next_bit((addr), (size), (bit)); \
46 (bit) < (size); \
47 (bit) = find_next_bit((addr), (size), (bit) + 1))
48
49#define for_each_clear_bit(bit, addr, size) \
50 for ((bit) = find_first_zero_bit((addr), (size)); \
51 (bit) < (size); \
52 (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
53
54
55#define for_each_clear_bit_from(bit, addr, size) \
56 for ((bit) = find_next_zero_bit((addr), (size), (bit)); \
57 (bit) < (size); \
58 (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
59
60static __inline__ int get_bitmask_order(unsigned int count)
61{
62 int order;
63
64 order = fls(count);
65 return order;
66}
67
68static __inline__ int get_count_order(unsigned int count)
69{
70 int order;
71
72 order = fls(count) - 1;
73 if (count & (count - 1))
74 order++;
75 return order;
76}
77
78static inline unsigned long hweight_long(unsigned long w)
79{
80 return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
81}
82
83
84
85
86
87
88static inline __u64 rol64(__u64 word, unsigned int shift)
89{
90 return (word << shift) | (word >> (64 - shift));
91}
92
93
94
95
96
97
98static inline __u64 ror64(__u64 word, unsigned int shift)
99{
100 return (word >> shift) | (word << (64 - shift));
101}
102
103
104
105
106
107
108static inline __u32 rol32(__u32 word, unsigned int shift)
109{
110 return (word << shift) | (word >> (32 - shift));
111}
112
113
114
115
116
117
118static inline __u32 ror32(__u32 word, unsigned int shift)
119{
120 return (word >> shift) | (word << (32 - shift));
121}
122
123
124
125
126
127
128static inline __u16 rol16(__u16 word, unsigned int shift)
129{
130 return (word << shift) | (word >> (16 - shift));
131}
132
133
134
135
136
137
138static inline __u16 ror16(__u16 word, unsigned int shift)
139{
140 return (word >> shift) | (word << (16 - shift));
141}
142
143
144
145
146
147
148static inline __u8 rol8(__u8 word, unsigned int shift)
149{
150 return (word << shift) | (word >> (8 - shift));
151}
152
153
154
155
156
157
158static inline __u8 ror8(__u8 word, unsigned int shift)
159{
160 return (word >> shift) | (word << (8 - shift));
161}
162
163
164
165
166
167
168static inline __s32 sign_extend32(__u32 value, int index)
169{
170 __u8 shift = 31 - index;
171 return (__s32)(value << shift) >> shift;
172}
173
174static inline unsigned fls_long(unsigned long l)
175{
176 if (sizeof(l) == 4)
177 return fls(l);
178 return fls64(l);
179}
180
181
182
183
184
185
186
187
188
189static inline unsigned long __ffs64(u64 word)
190{
191#if BITS_PER_LONG == 32
192 if (((u32)word) == 0UL)
193 return __ffs((u32)(word >> 32)) + 32;
194#elif BITS_PER_LONG != 64
195#error BITS_PER_LONG not 32 or 64
196#endif
197 return __ffs((unsigned long)word);
198}
199
200#ifdef __KERNEL__
201
202#ifndef set_mask_bits
203#define set_mask_bits(ptr, _mask, _bits) \
204({ \
205 const typeof(*ptr) mask = (_mask), bits = (_bits); \
206 typeof(*ptr) old, new; \
207 \
208 do { \
209 old = ACCESS_ONCE(*ptr); \
210 new = (old & ~mask) | bits; \
211 } while (cmpxchg(ptr, old, new) != old); \
212 \
213 new; \
214})
215#endif
216
217#ifndef find_last_bit
218
219
220
221
222
223
224
225extern unsigned long find_last_bit(const unsigned long *addr,
226 unsigned long size);
227#endif
228
229#endif
230#endif
231