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) | |
d05be13b | 9 | #define BITS_PER_BYTE 8 |
ede9c697 | 10 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
d05be13b JS |
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 | ||
3afe3925 HH |
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 | ||
962749af AM |
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 | ||
952043ac SW |
115 | /** |
116 | * __ffs64 - find first set bit in a 64 bit word | |
117 | * @word: The 64 bit word | |
118 | * | |
119 | * On 64 bit arches this is a synomyn for __ffs | |
120 | * The result is not defined if no bits are set, so check that @word | |
121 | * is non-zero before calling this. | |
122 | */ | |
123 | static inline unsigned long __ffs64(u64 word) | |
124 | { | |
125 | #if BITS_PER_LONG == 32 | |
126 | if (((u32)word) == 0UL) | |
127 | return __ffs((u32)(word >> 32)) + 32; | |
128 | #elif BITS_PER_LONG != 64 | |
129 | #error BITS_PER_LONG not 32 or 64 | |
130 | #endif | |
131 | return __ffs((unsigned long)word); | |
132 | } | |
133 | ||
64970b68 | 134 | #ifdef __KERNEL__ |
77b9bd9c | 135 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
77b9bd9c AH |
136 | |
137 | /** | |
138 | * find_first_bit - find the first set bit in a memory region | |
139 | * @addr: The address to start the search at | |
140 | * @size: The maximum size to search | |
141 | * | |
142 | * Returns the bit number of the first set bit. | |
143 | */ | |
fee4b19f TG |
144 | extern unsigned long find_first_bit(const unsigned long *addr, |
145 | unsigned long size); | |
77b9bd9c AH |
146 | |
147 | /** | |
148 | * find_first_zero_bit - find the first cleared bit in a memory region | |
149 | * @addr: The address to start the search at | |
150 | * @size: The maximum size to search | |
151 | * | |
152 | * Returns the bit number of the first cleared bit. | |
153 | */ | |
fee4b19f TG |
154 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
155 | unsigned long size); | |
77b9bd9c AH |
156 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
157 | ||
ab53d472 RR |
158 | #ifdef CONFIG_GENERIC_FIND_LAST_BIT |
159 | /** | |
160 | * find_last_bit - find the last set bit in a memory region | |
161 | * @addr: The address to start the search at | |
162 | * @size: The maximum size to search | |
163 | * | |
164 | * Returns the bit number of the first set bit, or size. | |
165 | */ | |
166 | extern unsigned long find_last_bit(const unsigned long *addr, | |
167 | unsigned long size); | |
168 | #endif /* CONFIG_GENERIC_FIND_LAST_BIT */ | |
169 | ||
64970b68 | 170 | #ifdef CONFIG_GENERIC_FIND_NEXT_BIT |
64970b68 AH |
171 | |
172 | /** | |
173 | * find_next_bit - find the next set bit in a memory region | |
174 | * @addr: The address to base the search on | |
175 | * @offset: The bitnumber to start searching at | |
176 | * @size: The bitmap size in bits | |
177 | */ | |
fee4b19f TG |
178 | extern unsigned long find_next_bit(const unsigned long *addr, |
179 | unsigned long size, unsigned long offset); | |
64970b68 AH |
180 | |
181 | /** | |
182 | * find_next_zero_bit - find the next cleared bit in a memory region | |
183 | * @addr: The address to base the search on | |
184 | * @offset: The bitnumber to start searching at | |
185 | * @size: The bitmap size in bits | |
186 | */ | |
fee4b19f TG |
187 | |
188 | extern unsigned long find_next_zero_bit(const unsigned long *addr, | |
189 | unsigned long size, | |
190 | unsigned long offset); | |
191 | ||
64970b68 AH |
192 | #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */ |
193 | #endif /* __KERNEL__ */ | |
1da177e4 | 194 | #endif |