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1 | #ifndef __LINUX_BITMAP_H |
2 | #define __LINUX_BITMAP_H | |
3 | ||
4 | #ifndef __ASSEMBLY__ | |
5 | ||
6 | #include <linux/types.h> | |
7 | #include <linux/bitops.h> | |
8 | #include <linux/string.h> | |
9 | ||
10 | /* | |
11 | * bitmaps provide bit arrays that consume one or more unsigned | |
12 | * longs. The bitmap interface and available operations are listed | |
13 | * here, in bitmap.h | |
14 | * | |
15 | * Function implementations generic to all architectures are in | |
16 | * lib/bitmap.c. Functions implementations that are architecture | |
17 | * specific are in various include/asm-<arch>/bitops.h headers | |
18 | * and other arch/<arch> specific files. | |
19 | * | |
20 | * See lib/bitmap.c for more details. | |
21 | */ | |
22 | ||
23 | /* | |
24 | * The available bitmap operations and their rough meaning in the | |
25 | * case that the bitmap is a single unsigned long are thus: | |
26 | * | |
27 | * bitmap_zero(dst, nbits) *dst = 0UL | |
28 | * bitmap_fill(dst, nbits) *dst = ~0UL | |
29 | * bitmap_copy(dst, src, nbits) *dst = *src | |
30 | * bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2 | |
31 | * bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2 | |
32 | * bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2 | |
33 | * bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2) | |
34 | * bitmap_complement(dst, src, nbits) *dst = ~(*src) | |
35 | * bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal? | |
36 | * bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap? | |
37 | * bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2? | |
38 | * bitmap_empty(src, nbits) Are all bits zero in *src? | |
39 | * bitmap_full(src, nbits) Are all bits set in *src? | |
40 | * bitmap_weight(src, nbits) Hamming Weight: number set bits | |
41 | * bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n | |
42 | * bitmap_shift_left(dst, src, n, nbits) *dst = *src << n | |
43 | * bitmap_scnprintf(buf, len, src, nbits) Print bitmap src to buf | |
44 | * bitmap_parse(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf | |
45 | * bitmap_scnlistprintf(buf, len, src, nbits) Print bitmap src as list to buf | |
46 | * bitmap_parselist(buf, dst, nbits) Parse bitmap dst from list | |
47 | */ | |
48 | ||
49 | /* | |
50 | * Also the following operations in asm/bitops.h apply to bitmaps. | |
51 | * | |
52 | * set_bit(bit, addr) *addr |= bit | |
53 | * clear_bit(bit, addr) *addr &= ~bit | |
54 | * change_bit(bit, addr) *addr ^= bit | |
55 | * test_bit(bit, addr) Is bit set in *addr? | |
56 | * test_and_set_bit(bit, addr) Set bit and return old value | |
57 | * test_and_clear_bit(bit, addr) Clear bit and return old value | |
58 | * test_and_change_bit(bit, addr) Change bit and return old value | |
59 | * find_first_zero_bit(addr, nbits) Position first zero bit in *addr | |
60 | * find_first_bit(addr, nbits) Position first set bit in *addr | |
61 | * find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit | |
62 | * find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit | |
63 | */ | |
64 | ||
65 | /* | |
66 | * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used | |
67 | * to declare an array named 'name' of just enough unsigned longs to | |
68 | * contain all bit positions from 0 to 'bits' - 1. | |
69 | */ | |
70 | ||
71 | /* | |
72 | * lib/bitmap.c provides these functions: | |
73 | */ | |
74 | ||
75 | extern int __bitmap_empty(const unsigned long *bitmap, int bits); | |
76 | extern int __bitmap_full(const unsigned long *bitmap, int bits); | |
77 | extern int __bitmap_equal(const unsigned long *bitmap1, | |
78 | const unsigned long *bitmap2, int bits); | |
79 | extern void __bitmap_complement(unsigned long *dst, const unsigned long *src, | |
80 | int bits); | |
81 | extern void __bitmap_shift_right(unsigned long *dst, | |
82 | const unsigned long *src, int shift, int bits); | |
83 | extern void __bitmap_shift_left(unsigned long *dst, | |
84 | const unsigned long *src, int shift, int bits); | |
85 | extern void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, | |
86 | const unsigned long *bitmap2, int bits); | |
87 | extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, | |
88 | const unsigned long *bitmap2, int bits); | |
89 | extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, | |
90 | const unsigned long *bitmap2, int bits); | |
91 | extern void __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, | |
92 | const unsigned long *bitmap2, int bits); | |
93 | extern int __bitmap_intersects(const unsigned long *bitmap1, | |
94 | const unsigned long *bitmap2, int bits); | |
95 | extern int __bitmap_subset(const unsigned long *bitmap1, | |
96 | const unsigned long *bitmap2, int bits); | |
97 | extern int __bitmap_weight(const unsigned long *bitmap, int bits); | |
98 | ||
99 | extern int bitmap_scnprintf(char *buf, unsigned int len, | |
100 | const unsigned long *src, int nbits); | |
101 | extern int bitmap_parse(const char __user *ubuf, unsigned int ulen, | |
102 | unsigned long *dst, int nbits); | |
103 | extern int bitmap_scnlistprintf(char *buf, unsigned int len, | |
104 | const unsigned long *src, int nbits); | |
105 | extern int bitmap_parselist(const char *buf, unsigned long *maskp, | |
106 | int nmaskbits); | |
107 | extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order); | |
108 | extern void bitmap_release_region(unsigned long *bitmap, int pos, int order); | |
109 | extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order); | |
110 | ||
111 | #define BITMAP_LAST_WORD_MASK(nbits) \ | |
112 | ( \ | |
113 | ((nbits) % BITS_PER_LONG) ? \ | |
114 | (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ | |
115 | ) | |
116 | ||
117 | static inline void bitmap_zero(unsigned long *dst, int nbits) | |
118 | { | |
119 | if (nbits <= BITS_PER_LONG) | |
120 | *dst = 0UL; | |
121 | else { | |
122 | int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); | |
123 | memset(dst, 0, len); | |
124 | } | |
125 | } | |
126 | ||
127 | static inline void bitmap_fill(unsigned long *dst, int nbits) | |
128 | { | |
129 | size_t nlongs = BITS_TO_LONGS(nbits); | |
130 | if (nlongs > 1) { | |
131 | int len = (nlongs - 1) * sizeof(unsigned long); | |
132 | memset(dst, 0xff, len); | |
133 | } | |
134 | dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits); | |
135 | } | |
136 | ||
137 | static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, | |
138 | int nbits) | |
139 | { | |
140 | if (nbits <= BITS_PER_LONG) | |
141 | *dst = *src; | |
142 | else { | |
143 | int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); | |
144 | memcpy(dst, src, len); | |
145 | } | |
146 | } | |
147 | ||
148 | static inline void bitmap_and(unsigned long *dst, const unsigned long *src1, | |
149 | const unsigned long *src2, int nbits) | |
150 | { | |
151 | if (nbits <= BITS_PER_LONG) | |
152 | *dst = *src1 & *src2; | |
153 | else | |
154 | __bitmap_and(dst, src1, src2, nbits); | |
155 | } | |
156 | ||
157 | static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, | |
158 | const unsigned long *src2, int nbits) | |
159 | { | |
160 | if (nbits <= BITS_PER_LONG) | |
161 | *dst = *src1 | *src2; | |
162 | else | |
163 | __bitmap_or(dst, src1, src2, nbits); | |
164 | } | |
165 | ||
166 | static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1, | |
167 | const unsigned long *src2, int nbits) | |
168 | { | |
169 | if (nbits <= BITS_PER_LONG) | |
170 | *dst = *src1 ^ *src2; | |
171 | else | |
172 | __bitmap_xor(dst, src1, src2, nbits); | |
173 | } | |
174 | ||
175 | static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1, | |
176 | const unsigned long *src2, int nbits) | |
177 | { | |
178 | if (nbits <= BITS_PER_LONG) | |
179 | *dst = *src1 & ~(*src2); | |
180 | else | |
181 | __bitmap_andnot(dst, src1, src2, nbits); | |
182 | } | |
183 | ||
184 | static inline void bitmap_complement(unsigned long *dst, const unsigned long *src, | |
185 | int nbits) | |
186 | { | |
187 | if (nbits <= BITS_PER_LONG) | |
188 | *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits); | |
189 | else | |
190 | __bitmap_complement(dst, src, nbits); | |
191 | } | |
192 | ||
193 | static inline int bitmap_equal(const unsigned long *src1, | |
194 | const unsigned long *src2, int nbits) | |
195 | { | |
196 | if (nbits <= BITS_PER_LONG) | |
197 | return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits)); | |
198 | else | |
199 | return __bitmap_equal(src1, src2, nbits); | |
200 | } | |
201 | ||
202 | static inline int bitmap_intersects(const unsigned long *src1, | |
203 | const unsigned long *src2, int nbits) | |
204 | { | |
205 | if (nbits <= BITS_PER_LONG) | |
206 | return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; | |
207 | else | |
208 | return __bitmap_intersects(src1, src2, nbits); | |
209 | } | |
210 | ||
211 | static inline int bitmap_subset(const unsigned long *src1, | |
212 | const unsigned long *src2, int nbits) | |
213 | { | |
214 | if (nbits <= BITS_PER_LONG) | |
215 | return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits)); | |
216 | else | |
217 | return __bitmap_subset(src1, src2, nbits); | |
218 | } | |
219 | ||
220 | static inline int bitmap_empty(const unsigned long *src, int nbits) | |
221 | { | |
222 | if (nbits <= BITS_PER_LONG) | |
223 | return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); | |
224 | else | |
225 | return __bitmap_empty(src, nbits); | |
226 | } | |
227 | ||
228 | static inline int bitmap_full(const unsigned long *src, int nbits) | |
229 | { | |
230 | if (nbits <= BITS_PER_LONG) | |
231 | return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits)); | |
232 | else | |
233 | return __bitmap_full(src, nbits); | |
234 | } | |
235 | ||
236 | static inline int bitmap_weight(const unsigned long *src, int nbits) | |
237 | { | |
238 | return __bitmap_weight(src, nbits); | |
239 | } | |
240 | ||
241 | static inline void bitmap_shift_right(unsigned long *dst, | |
242 | const unsigned long *src, int n, int nbits) | |
243 | { | |
244 | if (nbits <= BITS_PER_LONG) | |
245 | *dst = *src >> n; | |
246 | else | |
247 | __bitmap_shift_right(dst, src, n, nbits); | |
248 | } | |
249 | ||
250 | static inline void bitmap_shift_left(unsigned long *dst, | |
251 | const unsigned long *src, int n, int nbits) | |
252 | { | |
253 | if (nbits <= BITS_PER_LONG) | |
254 | *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits); | |
255 | else | |
256 | __bitmap_shift_left(dst, src, n, nbits); | |
257 | } | |
258 | ||
259 | #endif /* __ASSEMBLY__ */ | |
260 | ||
261 | #endif /* __LINUX_BITMAP_H */ |