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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 | ||
984b3f57 | 19 | #define for_each_set_bit(bit, addr, size) \ |
3e037454 SN |
20 | for ((bit) = find_first_bit((addr), (size)); \ |
21 | (bit) < (size); \ | |
22 | (bit) = find_next_bit((addr), (size), (bit) + 1)) | |
23 | ||
984b3f57 AM |
24 | /* Temporary */ |
25 | #define for_each_bit(bit, addr, size) for_each_set_bit(bit, addr, size) | |
3e037454 | 26 | |
1da177e4 LT |
27 | static __inline__ int get_bitmask_order(unsigned int count) |
28 | { | |
29 | int order; | |
9f41699e | 30 | |
1da177e4 LT |
31 | order = fls(count); |
32 | return order; /* We could be slightly more clever with -1 here... */ | |
33 | } | |
34 | ||
94605eff SS |
35 | static __inline__ int get_count_order(unsigned int count) |
36 | { | |
37 | int order; | |
9f41699e | 38 | |
94605eff SS |
39 | order = fls(count) - 1; |
40 | if (count & (count - 1)) | |
41 | order++; | |
42 | return order; | |
43 | } | |
44 | ||
1da177e4 LT |
45 | static inline unsigned long hweight_long(unsigned long w) |
46 | { | |
e9bebd6f | 47 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
1da177e4 LT |
48 | } |
49 | ||
45f8bde0 | 50 | /** |
1da177e4 | 51 | * rol32 - rotate a 32-bit value left |
1da177e4 LT |
52 | * @word: value to rotate |
53 | * @shift: bits to roll | |
54 | */ | |
55 | static inline __u32 rol32(__u32 word, unsigned int shift) | |
56 | { | |
57 | return (word << shift) | (word >> (32 - shift)); | |
58 | } | |
59 | ||
45f8bde0 | 60 | /** |
1da177e4 | 61 | * ror32 - rotate a 32-bit value right |
1da177e4 LT |
62 | * @word: value to rotate |
63 | * @shift: bits to roll | |
64 | */ | |
65 | static inline __u32 ror32(__u32 word, unsigned int shift) | |
66 | { | |
67 | return (word >> shift) | (word << (32 - shift)); | |
68 | } | |
69 | ||
3afe3925 HH |
70 | /** |
71 | * rol16 - rotate a 16-bit value left | |
72 | * @word: value to rotate | |
73 | * @shift: bits to roll | |
74 | */ | |
75 | static inline __u16 rol16(__u16 word, unsigned int shift) | |
76 | { | |
77 | return (word << shift) | (word >> (16 - shift)); | |
78 | } | |
79 | ||
80 | /** | |
81 | * ror16 - rotate a 16-bit value right | |
82 | * @word: value to rotate | |
83 | * @shift: bits to roll | |
84 | */ | |
85 | static inline __u16 ror16(__u16 word, unsigned int shift) | |
86 | { | |
87 | return (word >> shift) | (word << (16 - shift)); | |
88 | } | |
89 | ||
90 | /** | |
91 | * rol8 - rotate an 8-bit value left | |
92 | * @word: value to rotate | |
93 | * @shift: bits to roll | |
94 | */ | |
95 | static inline __u8 rol8(__u8 word, unsigned int shift) | |
96 | { | |
97 | return (word << shift) | (word >> (8 - shift)); | |
98 | } | |
99 | ||
100 | /** | |
101 | * ror8 - rotate an 8-bit value right | |
102 | * @word: value to rotate | |
103 | * @shift: bits to roll | |
104 | */ | |
105 | static inline __u8 ror8(__u8 word, unsigned int shift) | |
106 | { | |
107 | return (word >> shift) | (word << (8 - shift)); | |
108 | } | |
109 | ||
962749af AM |
110 | static inline unsigned fls_long(unsigned long l) |
111 | { | |
112 | if (sizeof(l) == 4) | |
113 | return fls(l); | |
114 | return fls64(l); | |
115 | } | |
116 | ||
952043ac SW |
117 | /** |
118 | * __ffs64 - find first set bit in a 64 bit word | |
119 | * @word: The 64 bit word | |
120 | * | |
121 | * On 64 bit arches this is a synomyn for __ffs | |
122 | * The result is not defined if no bits are set, so check that @word | |
123 | * is non-zero before calling this. | |
124 | */ | |
125 | static inline unsigned long __ffs64(u64 word) | |
126 | { | |
127 | #if BITS_PER_LONG == 32 | |
128 | if (((u32)word) == 0UL) | |
129 | return __ffs((u32)(word >> 32)) + 32; | |
130 | #elif BITS_PER_LONG != 64 | |
131 | #error BITS_PER_LONG not 32 or 64 | |
132 | #endif | |
133 | return __ffs((unsigned long)word); | |
134 | } | |
135 | ||
64970b68 | 136 | #ifdef __KERNEL__ |
77b9bd9c | 137 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
77b9bd9c AH |
138 | |
139 | /** | |
140 | * find_first_bit - find the first set bit in a memory region | |
141 | * @addr: The address to start the search at | |
142 | * @size: The maximum size to search | |
143 | * | |
144 | * Returns the bit number of the first set bit. | |
145 | */ | |
fee4b19f TG |
146 | extern unsigned long find_first_bit(const unsigned long *addr, |
147 | unsigned long size); | |
77b9bd9c AH |
148 | |
149 | /** | |
150 | * find_first_zero_bit - find the first cleared bit in a memory region | |
151 | * @addr: The address to start the search at | |
152 | * @size: The maximum size to search | |
153 | * | |
154 | * Returns the bit number of the first cleared bit. | |
155 | */ | |
fee4b19f TG |
156 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
157 | unsigned long size); | |
77b9bd9c AH |
158 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
159 | ||
ab53d472 RR |
160 | #ifdef CONFIG_GENERIC_FIND_LAST_BIT |
161 | /** | |
162 | * find_last_bit - find the last set bit in a memory region | |
163 | * @addr: The address to start the search at | |
164 | * @size: The maximum size to search | |
165 | * | |
166 | * Returns the bit number of the first set bit, or size. | |
167 | */ | |
168 | extern unsigned long find_last_bit(const unsigned long *addr, | |
169 | unsigned long size); | |
170 | #endif /* CONFIG_GENERIC_FIND_LAST_BIT */ | |
171 | ||
64970b68 | 172 | #ifdef CONFIG_GENERIC_FIND_NEXT_BIT |
64970b68 AH |
173 | |
174 | /** | |
175 | * find_next_bit - find the next set bit in a memory region | |
176 | * @addr: The address to base the search on | |
177 | * @offset: The bitnumber to start searching at | |
178 | * @size: The bitmap size in bits | |
179 | */ | |
fee4b19f TG |
180 | extern unsigned long find_next_bit(const unsigned long *addr, |
181 | unsigned long size, unsigned long offset); | |
64970b68 AH |
182 | |
183 | /** | |
184 | * find_next_zero_bit - find the next cleared bit in a memory region | |
185 | * @addr: The address to base the search on | |
186 | * @offset: The bitnumber to start searching at | |
187 | * @size: The bitmap size in bits | |
188 | */ | |
fee4b19f TG |
189 | |
190 | extern unsigned long find_next_zero_bit(const unsigned long *addr, | |
191 | unsigned long size, | |
192 | unsigned long offset); | |
193 | ||
64970b68 AH |
194 | #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */ |
195 | #endif /* __KERNEL__ */ | |
1da177e4 | 196 | #endif |