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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 | ||
4677d4a5 BP |
13 | extern unsigned int __sw_hweight8(unsigned int w); |
14 | extern unsigned int __sw_hweight16(unsigned int w); | |
15 | extern unsigned int __sw_hweight32(unsigned int w); | |
16 | extern unsigned long __sw_hweight64(__u64 w); | |
17 | ||
1da177e4 LT |
18 | /* |
19 | * Include this here because some architectures need generic_ffs/fls in | |
20 | * scope | |
21 | */ | |
22 | #include <asm/bitops.h> | |
23 | ||
984b3f57 | 24 | #define for_each_set_bit(bit, addr, size) \ |
1e2ad28f RR |
25 | for ((bit) = find_first_bit((addr), (size)); \ |
26 | (bit) < (size); \ | |
27 | (bit) = find_next_bit((addr), (size), (bit) + 1)) | |
28 | ||
29 | /* same as for_each_set_bit() but use bit as value to start with */ | |
30 | #define for_each_set_bit_cont(bit, addr, size) \ | |
31 | for ((bit) = find_next_bit((addr), (size), (bit)); \ | |
32 | (bit) < (size); \ | |
3e037454 SN |
33 | (bit) = find_next_bit((addr), (size), (bit) + 1)) |
34 | ||
1da177e4 LT |
35 | static __inline__ int get_bitmask_order(unsigned int count) |
36 | { | |
37 | int order; | |
9f41699e | 38 | |
1da177e4 LT |
39 | order = fls(count); |
40 | return order; /* We could be slightly more clever with -1 here... */ | |
41 | } | |
42 | ||
94605eff SS |
43 | static __inline__ int get_count_order(unsigned int count) |
44 | { | |
45 | int order; | |
9f41699e | 46 | |
94605eff SS |
47 | order = fls(count) - 1; |
48 | if (count & (count - 1)) | |
49 | order++; | |
50 | return order; | |
51 | } | |
52 | ||
1da177e4 LT |
53 | static inline unsigned long hweight_long(unsigned long w) |
54 | { | |
e9bebd6f | 55 | return sizeof(w) == 4 ? hweight32(w) : hweight64(w); |
1da177e4 LT |
56 | } |
57 | ||
45f8bde0 | 58 | /** |
1da177e4 | 59 | * rol32 - rotate a 32-bit value left |
1da177e4 LT |
60 | * @word: value to rotate |
61 | * @shift: bits to roll | |
62 | */ | |
63 | static inline __u32 rol32(__u32 word, unsigned int shift) | |
64 | { | |
65 | return (word << shift) | (word >> (32 - shift)); | |
66 | } | |
67 | ||
45f8bde0 | 68 | /** |
1da177e4 | 69 | * ror32 - rotate a 32-bit value right |
1da177e4 LT |
70 | * @word: value to rotate |
71 | * @shift: bits to roll | |
72 | */ | |
73 | static inline __u32 ror32(__u32 word, unsigned int shift) | |
74 | { | |
75 | return (word >> shift) | (word << (32 - shift)); | |
76 | } | |
77 | ||
3afe3925 HH |
78 | /** |
79 | * rol16 - rotate a 16-bit value left | |
80 | * @word: value to rotate | |
81 | * @shift: bits to roll | |
82 | */ | |
83 | static inline __u16 rol16(__u16 word, unsigned int shift) | |
84 | { | |
85 | return (word << shift) | (word >> (16 - shift)); | |
86 | } | |
87 | ||
88 | /** | |
89 | * ror16 - rotate a 16-bit value right | |
90 | * @word: value to rotate | |
91 | * @shift: bits to roll | |
92 | */ | |
93 | static inline __u16 ror16(__u16 word, unsigned int shift) | |
94 | { | |
95 | return (word >> shift) | (word << (16 - shift)); | |
96 | } | |
97 | ||
98 | /** | |
99 | * rol8 - rotate an 8-bit value left | |
100 | * @word: value to rotate | |
101 | * @shift: bits to roll | |
102 | */ | |
103 | static inline __u8 rol8(__u8 word, unsigned int shift) | |
104 | { | |
105 | return (word << shift) | (word >> (8 - shift)); | |
106 | } | |
107 | ||
108 | /** | |
109 | * ror8 - rotate an 8-bit value right | |
110 | * @word: value to rotate | |
111 | * @shift: bits to roll | |
112 | */ | |
113 | static inline __u8 ror8(__u8 word, unsigned int shift) | |
114 | { | |
115 | return (word >> shift) | (word << (8 - shift)); | |
116 | } | |
7919a57b AH |
117 | |
118 | /** | |
119 | * sign_extend32 - sign extend a 32-bit value using specified bit as sign-bit | |
120 | * @value: value to sign extend | |
121 | * @index: 0 based bit index (0<=index<32) to sign bit | |
122 | */ | |
123 | static inline __s32 sign_extend32(__u32 value, int index) | |
124 | { | |
125 | __u8 shift = 31 - index; | |
126 | return (__s32)(value << shift) >> shift; | |
127 | } | |
3afe3925 | 128 | |
962749af AM |
129 | static inline unsigned fls_long(unsigned long l) |
130 | { | |
131 | if (sizeof(l) == 4) | |
132 | return fls(l); | |
133 | return fls64(l); | |
134 | } | |
135 | ||
952043ac SW |
136 | /** |
137 | * __ffs64 - find first set bit in a 64 bit word | |
138 | * @word: The 64 bit word | |
139 | * | |
140 | * On 64 bit arches this is a synomyn for __ffs | |
141 | * The result is not defined if no bits are set, so check that @word | |
142 | * is non-zero before calling this. | |
143 | */ | |
144 | static inline unsigned long __ffs64(u64 word) | |
145 | { | |
146 | #if BITS_PER_LONG == 32 | |
147 | if (((u32)word) == 0UL) | |
148 | return __ffs((u32)(word >> 32)) + 32; | |
149 | #elif BITS_PER_LONG != 64 | |
150 | #error BITS_PER_LONG not 32 or 64 | |
151 | #endif | |
152 | return __ffs((unsigned long)word); | |
153 | } | |
154 | ||
64970b68 | 155 | #ifdef __KERNEL__ |
77b9bd9c | 156 | |
19de85ef | 157 | #ifndef find_last_bit |
ab53d472 RR |
158 | /** |
159 | * find_last_bit - find the last set bit in a memory region | |
160 | * @addr: The address to start the search at | |
161 | * @size: The maximum size to search | |
162 | * | |
163 | * Returns the bit number of the first set bit, or size. | |
164 | */ | |
165 | extern unsigned long find_last_bit(const unsigned long *addr, | |
166 | unsigned long size); | |
19de85ef | 167 | #endif |
ab53d472 | 168 | |
64970b68 | 169 | #endif /* __KERNEL__ */ |
1da177e4 | 170 | #endif |