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 #include <linux/kernel.h>
10
11 /*
12 * bitmaps provide bit arrays that consume one or more unsigned
13 * longs. The bitmap interface and available operations are listed
14 * here, in bitmap.h
15 *
16 * Function implementations generic to all architectures are in
17 * lib/bitmap.c. Functions implementations that are architecture
18 * specific are in various include/asm-<arch>/bitops.h headers
19 * and other arch/<arch> specific files.
20 *
21 * See lib/bitmap.c for more details.
22 */
23
24 /*
25 * The available bitmap operations and their rough meaning in the
26 * case that the bitmap is a single unsigned long are thus:
27 *
28 * Note that nbits should be always a compile time evaluable constant.
29 * Otherwise many inlines will generate horrible code.
30 *
31 * bitmap_zero(dst, nbits) *dst = 0UL
32 * bitmap_fill(dst, nbits) *dst = ~0UL
33 * bitmap_copy(dst, src, nbits) *dst = *src
34 * bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2
35 * bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2
36 * bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2
37 * bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2)
38 * bitmap_complement(dst, src, nbits) *dst = ~(*src)
39 * bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal?
40 * bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap?
41 * bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2?
42 * bitmap_empty(src, nbits) Are all bits zero in *src?
43 * bitmap_full(src, nbits) Are all bits set in *src?
44 * bitmap_weight(src, nbits) Hamming Weight: number set bits
45 * bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n
46 * bitmap_shift_left(dst, src, n, nbits) *dst = *src << n
47 * bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src)
48 * bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit)
49 * bitmap_onto(dst, orig, relmap, nbits) *dst = orig relative to relmap
50 * bitmap_fold(dst, orig, sz, nbits) dst bits = orig bits mod sz
51 * bitmap_scnprintf(buf, len, src, nbits) Print bitmap src to buf
52 * bitmap_parse(buf, buflen, dst, nbits) Parse bitmap dst from kernel buf
53 * bitmap_parse_user(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf
54 * bitmap_scnlistprintf(buf, len, src, nbits) Print bitmap src as list to buf
55 * bitmap_parselist(buf, dst, nbits) Parse bitmap dst from list
56 * bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region
57 * bitmap_release_region(bitmap, pos, order) Free specified bit region
58 * bitmap_allocate_region(bitmap, pos, order) Allocate specified bit region
59 */
60
61 /*
62 * Also the following operations in asm/bitops.h apply to bitmaps.
63 *
64 * set_bit(bit, addr) *addr |= bit
65 * clear_bit(bit, addr) *addr &= ~bit
66 * change_bit(bit, addr) *addr ^= bit
67 * test_bit(bit, addr) Is bit set in *addr?
68 * test_and_set_bit(bit, addr) Set bit and return old value
69 * test_and_clear_bit(bit, addr) Clear bit and return old value
70 * test_and_change_bit(bit, addr) Change bit and return old value
71 * find_first_zero_bit(addr, nbits) Position first zero bit in *addr
72 * find_first_bit(addr, nbits) Position first set bit in *addr
73 * find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit
74 * find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit
75 */
76
77 /*
78 * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used
79 * to declare an array named 'name' of just enough unsigned longs to
80 * contain all bit positions from 0 to 'bits' - 1.
81 */
82
83 /*
84 * lib/bitmap.c provides these functions:
85 */
86
87 extern int __bitmap_empty(const unsigned long *bitmap, int bits);
88 extern int __bitmap_full(const unsigned long *bitmap, int bits);
89 extern int __bitmap_equal(const unsigned long *bitmap1,
90 const unsigned long *bitmap2, int bits);
91 extern void __bitmap_complement(unsigned long *dst, const unsigned long *src,
92 int bits);
93 extern void __bitmap_shift_right(unsigned long *dst,
94 const unsigned long *src, int shift, int bits);
95 extern void __bitmap_shift_left(unsigned long *dst,
96 const unsigned long *src, int shift, int bits);
97 extern int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
98 const unsigned long *bitmap2, int bits);
99 extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
100 const unsigned long *bitmap2, int bits);
101 extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1,
102 const unsigned long *bitmap2, int bits);
103 extern int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1,
104 const unsigned long *bitmap2, int bits);
105 extern int __bitmap_intersects(const unsigned long *bitmap1,
106 const unsigned long *bitmap2, int bits);
107 extern int __bitmap_subset(const unsigned long *bitmap1,
108 const unsigned long *bitmap2, int bits);
109 extern int __bitmap_weight(const unsigned long *bitmap, int bits);
110
111 extern int bitmap_scnprintf(char *buf, unsigned int len,
112 const unsigned long *src, int nbits);
113 extern int __bitmap_parse(const char *buf, unsigned int buflen, int is_user,
114 unsigned long *dst, int nbits);
115 extern int bitmap_parse_user(const char __user *ubuf, unsigned int ulen,
116 unsigned long *dst, int nbits);
117 extern int bitmap_scnlistprintf(char *buf, unsigned int len,
118 const unsigned long *src, int nbits);
119 extern int bitmap_parselist(const char *buf, unsigned long *maskp,
120 int nmaskbits);
121 extern void bitmap_remap(unsigned long *dst, const unsigned long *src,
122 const unsigned long *old, const unsigned long *new, int bits);
123 extern int bitmap_bitremap(int oldbit,
124 const unsigned long *old, const unsigned long *new, int bits);
125 extern void bitmap_onto(unsigned long *dst, const unsigned long *orig,
126 const unsigned long *relmap, int bits);
127 extern void bitmap_fold(unsigned long *dst, const unsigned long *orig,
128 int sz, int bits);
129 extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order);
130 extern void bitmap_release_region(unsigned long *bitmap, int pos, int order);
131 extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order);
132 extern void bitmap_copy_le(void *dst, const unsigned long *src, int nbits);
133
134 #define BITMAP_LAST_WORD_MASK(nbits) \
135 ( \
136 ((nbits) % BITS_PER_LONG) ? \
137 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \
138 )
139
140 #define small_const_nbits(nbits) \
141 (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
142
143 static inline void bitmap_zero(unsigned long *dst, int nbits)
144 {
145 if (small_const_nbits(nbits))
146 *dst = 0UL;
147 else {
148 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
149 memset(dst, 0, len);
150 }
151 }
152
153 static inline void bitmap_fill(unsigned long *dst, int nbits)
154 {
155 size_t nlongs = BITS_TO_LONGS(nbits);
156 if (!small_const_nbits(nbits)) {
157 int len = (nlongs - 1) * sizeof(unsigned long);
158 memset(dst, 0xff, len);
159 }
160 dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
161 }
162
163 static inline void bitmap_copy(unsigned long *dst, const unsigned long *src,
164 int nbits)
165 {
166 if (small_const_nbits(nbits))
167 *dst = *src;
168 else {
169 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
170 memcpy(dst, src, len);
171 }
172 }
173
174 static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
175 const unsigned long *src2, int nbits)
176 {
177 if (small_const_nbits(nbits))
178 return (*dst = *src1 & *src2) != 0;
179 return __bitmap_and(dst, src1, src2, nbits);
180 }
181
182 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
183 const unsigned long *src2, int nbits)
184 {
185 if (small_const_nbits(nbits))
186 *dst = *src1 | *src2;
187 else
188 __bitmap_or(dst, src1, src2, nbits);
189 }
190
191 static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1,
192 const unsigned long *src2, int nbits)
193 {
194 if (small_const_nbits(nbits))
195 *dst = *src1 ^ *src2;
196 else
197 __bitmap_xor(dst, src1, src2, nbits);
198 }
199
200 static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1,
201 const unsigned long *src2, int nbits)
202 {
203 if (small_const_nbits(nbits))
204 return (*dst = *src1 & ~(*src2)) != 0;
205 return __bitmap_andnot(dst, src1, src2, nbits);
206 }
207
208 static inline void bitmap_complement(unsigned long *dst, const unsigned long *src,
209 int nbits)
210 {
211 if (small_const_nbits(nbits))
212 *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits);
213 else
214 __bitmap_complement(dst, src, nbits);
215 }
216
217 static inline int bitmap_equal(const unsigned long *src1,
218 const unsigned long *src2, int nbits)
219 {
220 if (small_const_nbits(nbits))
221 return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
222 else
223 return __bitmap_equal(src1, src2, nbits);
224 }
225
226 static inline int bitmap_intersects(const unsigned long *src1,
227 const unsigned long *src2, int nbits)
228 {
229 if (small_const_nbits(nbits))
230 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
231 else
232 return __bitmap_intersects(src1, src2, nbits);
233 }
234
235 static inline int bitmap_subset(const unsigned long *src1,
236 const unsigned long *src2, int nbits)
237 {
238 if (small_const_nbits(nbits))
239 return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits));
240 else
241 return __bitmap_subset(src1, src2, nbits);
242 }
243
244 static inline int bitmap_empty(const unsigned long *src, int nbits)
245 {
246 if (small_const_nbits(nbits))
247 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
248 else
249 return __bitmap_empty(src, nbits);
250 }
251
252 static inline int bitmap_full(const unsigned long *src, int nbits)
253 {
254 if (small_const_nbits(nbits))
255 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
256 else
257 return __bitmap_full(src, nbits);
258 }
259
260 static inline int bitmap_weight(const unsigned long *src, int nbits)
261 {
262 if (small_const_nbits(nbits))
263 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
264 return __bitmap_weight(src, nbits);
265 }
266
267 static inline void bitmap_shift_right(unsigned long *dst,
268 const unsigned long *src, int n, int nbits)
269 {
270 if (small_const_nbits(nbits))
271 *dst = *src >> n;
272 else
273 __bitmap_shift_right(dst, src, n, nbits);
274 }
275
276 static inline void bitmap_shift_left(unsigned long *dst,
277 const unsigned long *src, int n, int nbits)
278 {
279 if (small_const_nbits(nbits))
280 *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits);
281 else
282 __bitmap_shift_left(dst, src, n, nbits);
283 }
284
285 static inline int bitmap_parse(const char *buf, unsigned int buflen,
286 unsigned long *maskp, int nmaskbits)
287 {
288 return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits);
289 }
290
291 #endif /* __ASSEMBLY__ */
292
293 #endif /* __LINUX_BITMAP_H */
294
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