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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_PER_BYTE 8 |
10 | #define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long)) |
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 | /** |
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 | |
134 | #ifdef __KERNEL__ |
135 | #ifdef CONFIG_GENERIC_FIND_FIRST_BIT |
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 | */ |
144 | extern unsigned long find_first_bit(const unsigned long *addr, |
145 | unsigned long size); |
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 | */ |
154 | extern unsigned long find_first_zero_bit(const unsigned long *addr, |
155 | unsigned long size); |
156 | #endif /* CONFIG_GENERIC_FIND_FIRST_BIT */ |
157 | |
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 | |
170 | #ifdef CONFIG_GENERIC_FIND_NEXT_BIT |
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 | */ |
178 | extern unsigned long find_next_bit(const unsigned long *addr, |
179 | unsigned long size, unsigned long offset); |
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 | */ |
187 | |
188 | extern unsigned long find_next_zero_bit(const unsigned long *addr, |
189 | unsigned long size, |
190 | unsigned long offset); |
191 | |
192 | #endif /* CONFIG_GENERIC_FIND_NEXT_BIT */ |
193 | #endif /* __KERNEL__ */ |
194 | #endif |
195 |
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