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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_BITMAP_H |
3 | #define __LINUX_BITMAP_H | |
4 | ||
5 | #ifndef __ASSEMBLY__ | |
6 | ||
08c5188e | 7 | #include <linux/align.h> |
1da177e4 | 8 | #include <linux/bitops.h> |
08c5188e | 9 | #include <linux/limits.h> |
c13656b9 BG |
10 | #include <linux/string.h> |
11 | #include <linux/types.h> | |
1da177e4 | 12 | |
e829c2e4 BG |
13 | struct device; |
14 | ||
1da177e4 LT |
15 | /* |
16 | * bitmaps provide bit arrays that consume one or more unsigned | |
17 | * longs. The bitmap interface and available operations are listed | |
18 | * here, in bitmap.h | |
19 | * | |
20 | * Function implementations generic to all architectures are in | |
21 | * lib/bitmap.c. Functions implementations that are architecture | |
22 | * specific are in various include/asm-<arch>/bitops.h headers | |
23 | * and other arch/<arch> specific files. | |
24 | * | |
25 | * See lib/bitmap.c for more details. | |
26 | */ | |
27 | ||
7d7363e4 RD |
28 | /** |
29 | * DOC: bitmap overview | |
30 | * | |
1da177e4 LT |
31 | * The available bitmap operations and their rough meaning in the |
32 | * case that the bitmap is a single unsigned long are thus: | |
33 | * | |
41e7b166 RV |
34 | * The generated code is more efficient when nbits is known at |
35 | * compile-time and at most BITS_PER_LONG. | |
08cd3657 | 36 | * |
7d7363e4 RD |
37 | * :: |
38 | * | |
39 | * bitmap_zero(dst, nbits) *dst = 0UL | |
40 | * bitmap_fill(dst, nbits) *dst = ~0UL | |
41 | * bitmap_copy(dst, src, nbits) *dst = *src | |
42 | * bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2 | |
43 | * bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2 | |
44 | * bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2 | |
45 | * bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2) | |
46 | * bitmap_complement(dst, src, nbits) *dst = ~(*src) | |
47 | * bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal? | |
48 | * bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap? | |
49 | * bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2? | |
50 | * bitmap_empty(src, nbits) Are all bits zero in *src? | |
51 | * bitmap_full(src, nbits) Are all bits set in *src? | |
52 | * bitmap_weight(src, nbits) Hamming Weight: number set bits | |
53 | * bitmap_set(dst, pos, nbits) Set specified bit area | |
54 | * bitmap_clear(dst, pos, nbits) Clear specified bit area | |
55 | * bitmap_find_next_zero_area(buf, len, pos, n, mask) Find bit free area | |
780d2a9c | 56 | * bitmap_find_next_zero_area_off(buf, len, pos, n, mask, mask_off) as above |
a392d26f WS |
57 | * bitmap_next_clear_region(map, &start, &end, nbits) Find next clear region |
58 | * bitmap_next_set_region(map, &start, &end, nbits) Find next set region | |
59 | * bitmap_for_each_clear_region(map, rs, re, start, end) | |
60 | * Iterate over all clear regions | |
61 | * bitmap_for_each_set_region(map, rs, re, start, end) | |
62 | * Iterate over all set regions | |
7d7363e4 RD |
63 | * bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n |
64 | * bitmap_shift_left(dst, src, n, nbits) *dst = *src << n | |
20927671 | 65 | * bitmap_cut(dst, src, first, n, nbits) Cut n bits from first, copy rest |
30544ed5 | 66 | * bitmap_replace(dst, old, new, mask, nbits) *dst = (*old & ~(*mask)) | (*new & *mask) |
7d7363e4 RD |
67 | * bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src) |
68 | * bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit) | |
69 | * bitmap_onto(dst, orig, relmap, nbits) *dst = orig relative to relmap | |
70 | * bitmap_fold(dst, orig, sz, nbits) dst bits = orig bits mod sz | |
71 | * bitmap_parse(buf, buflen, dst, nbits) Parse bitmap dst from kernel buf | |
72 | * bitmap_parse_user(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf | |
73 | * bitmap_parselist(buf, dst, nbits) Parse bitmap dst from kernel buf | |
74 | * bitmap_parselist_user(buf, dst, nbits) Parse bitmap dst from user buf | |
75 | * bitmap_find_free_region(bitmap, bits, order) Find and allocate bit region | |
76 | * bitmap_release_region(bitmap, pos, order) Free specified bit region | |
77 | * bitmap_allocate_region(bitmap, pos, order) Allocate specified bit region | |
c724f193 YN |
78 | * bitmap_from_arr32(dst, buf, nbits) Copy nbits from u32[] buf to dst |
79 | * bitmap_to_arr32(buf, src, nbits) Copy nbits from buf to u32[] dst | |
169c474f WBG |
80 | * bitmap_get_value8(map, start) Get 8bit value from map at start |
81 | * bitmap_set_value8(map, value, start) Set 8bit value to map at start | |
7d7363e4 | 82 | * |
334cfa48 AS |
83 | * Note, bitmap_zero() and bitmap_fill() operate over the region of |
84 | * unsigned longs, that is, bits behind bitmap till the unsigned long | |
85 | * boundary will be zeroed or filled as well. Consider to use | |
86 | * bitmap_clear() or bitmap_set() to make explicit zeroing or filling | |
87 | * respectively. | |
1da177e4 LT |
88 | */ |
89 | ||
7d7363e4 RD |
90 | /** |
91 | * DOC: bitmap bitops | |
92 | * | |
93 | * Also the following operations in asm/bitops.h apply to bitmaps.:: | |
94 | * | |
95 | * set_bit(bit, addr) *addr |= bit | |
96 | * clear_bit(bit, addr) *addr &= ~bit | |
97 | * change_bit(bit, addr) *addr ^= bit | |
98 | * test_bit(bit, addr) Is bit set in *addr? | |
99 | * test_and_set_bit(bit, addr) Set bit and return old value | |
100 | * test_and_clear_bit(bit, addr) Clear bit and return old value | |
101 | * test_and_change_bit(bit, addr) Change bit and return old value | |
102 | * find_first_zero_bit(addr, nbits) Position first zero bit in *addr | |
103 | * find_first_bit(addr, nbits) Position first set bit in *addr | |
0ade34c3 CC |
104 | * find_next_zero_bit(addr, nbits, bit) |
105 | * Position next zero bit in *addr >= bit | |
7d7363e4 | 106 | * find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit |
0ade34c3 CC |
107 | * find_next_and_bit(addr1, addr2, nbits, bit) |
108 | * Same as find_next_bit, but in | |
109 | * (*addr1 & *addr2) | |
1da177e4 | 110 | * |
1da177e4 LT |
111 | */ |
112 | ||
7d7363e4 RD |
113 | /** |
114 | * DOC: declare bitmap | |
1da177e4 LT |
115 | * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used |
116 | * to declare an array named 'name' of just enough unsigned longs to | |
117 | * contain all bit positions from 0 to 'bits' - 1. | |
118 | */ | |
119 | ||
c42b65e3 AS |
120 | /* |
121 | * Allocation and deallocation of bitmap. | |
122 | * Provided in lib/bitmap.c to avoid circular dependency. | |
123 | */ | |
98635b29 BG |
124 | unsigned long *bitmap_alloc(unsigned int nbits, gfp_t flags); |
125 | unsigned long *bitmap_zalloc(unsigned int nbits, gfp_t flags); | |
126 | void bitmap_free(const unsigned long *bitmap); | |
c42b65e3 | 127 | |
e829c2e4 BG |
128 | /* Managed variants of the above. */ |
129 | unsigned long *devm_bitmap_alloc(struct device *dev, | |
130 | unsigned int nbits, gfp_t flags); | |
131 | unsigned long *devm_bitmap_zalloc(struct device *dev, | |
132 | unsigned int nbits, gfp_t flags); | |
133 | ||
1da177e4 LT |
134 | /* |
135 | * lib/bitmap.c provides these functions: | |
136 | */ | |
137 | ||
98635b29 BG |
138 | int __bitmap_equal(const unsigned long *bitmap1, |
139 | const unsigned long *bitmap2, unsigned int nbits); | |
140 | bool __pure __bitmap_or_equal(const unsigned long *src1, | |
141 | const unsigned long *src2, | |
142 | const unsigned long *src3, | |
143 | unsigned int nbits); | |
144 | void __bitmap_complement(unsigned long *dst, const unsigned long *src, | |
145 | unsigned int nbits); | |
146 | void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, | |
147 | unsigned int shift, unsigned int nbits); | |
148 | void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, | |
149 | unsigned int shift, unsigned int nbits); | |
150 | void bitmap_cut(unsigned long *dst, const unsigned long *src, | |
151 | unsigned int first, unsigned int cut, unsigned int nbits); | |
152 | int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, | |
153 | const unsigned long *bitmap2, unsigned int nbits); | |
154 | void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, | |
155 | const unsigned long *bitmap2, unsigned int nbits); | |
156 | void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, | |
157 | const unsigned long *bitmap2, unsigned int nbits); | |
158 | int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, | |
159 | const unsigned long *bitmap2, unsigned int nbits); | |
160 | void __bitmap_replace(unsigned long *dst, | |
161 | const unsigned long *old, const unsigned long *new, | |
162 | const unsigned long *mask, unsigned int nbits); | |
163 | int __bitmap_intersects(const unsigned long *bitmap1, | |
2f9305eb | 164 | const unsigned long *bitmap2, unsigned int nbits); |
98635b29 BG |
165 | int __bitmap_subset(const unsigned long *bitmap1, |
166 | const unsigned long *bitmap2, unsigned int nbits); | |
167 | int __bitmap_weight(const unsigned long *bitmap, unsigned int nbits); | |
168 | void __bitmap_set(unsigned long *map, unsigned int start, int len); | |
169 | void __bitmap_clear(unsigned long *map, unsigned int start, int len); | |
5e19b013 | 170 | |
98635b29 BG |
171 | unsigned long bitmap_find_next_zero_area_off(unsigned long *map, |
172 | unsigned long size, | |
173 | unsigned long start, | |
174 | unsigned int nr, | |
175 | unsigned long align_mask, | |
176 | unsigned long align_offset); | |
5e19b013 MN |
177 | |
178 | /** | |
179 | * bitmap_find_next_zero_area - find a contiguous aligned zero area | |
180 | * @map: The address to base the search on | |
181 | * @size: The bitmap size in bits | |
182 | * @start: The bitnumber to start searching at | |
183 | * @nr: The number of zeroed bits we're looking for | |
184 | * @align_mask: Alignment mask for zero area | |
185 | * | |
186 | * The @align_mask should be one less than a power of 2; the effect is that | |
187 | * the bit offset of all zero areas this function finds is multiples of that | |
188 | * power of 2. A @align_mask of 0 means no alignment is required. | |
189 | */ | |
190 | static inline unsigned long | |
191 | bitmap_find_next_zero_area(unsigned long *map, | |
192 | unsigned long size, | |
193 | unsigned long start, | |
194 | unsigned int nr, | |
195 | unsigned long align_mask) | |
196 | { | |
197 | return bitmap_find_next_zero_area_off(map, size, start, nr, | |
198 | align_mask, 0); | |
199 | } | |
c1a2a962 | 200 | |
98635b29 | 201 | int bitmap_parse(const char *buf, unsigned int buflen, |
01a3ee2b | 202 | unsigned long *dst, int nbits); |
98635b29 | 203 | int bitmap_parse_user(const char __user *ubuf, unsigned int ulen, |
1da177e4 | 204 | unsigned long *dst, int nbits); |
98635b29 | 205 | int bitmap_parselist(const char *buf, unsigned long *maskp, |
1da177e4 | 206 | int nmaskbits); |
98635b29 | 207 | int bitmap_parselist_user(const char __user *ubuf, unsigned int ulen, |
4b060420 | 208 | unsigned long *dst, int nbits); |
98635b29 | 209 | void bitmap_remap(unsigned long *dst, const unsigned long *src, |
9814ec13 | 210 | const unsigned long *old, const unsigned long *new, unsigned int nbits); |
98635b29 | 211 | int bitmap_bitremap(int oldbit, |
fb5eeeee | 212 | const unsigned long *old, const unsigned long *new, int bits); |
98635b29 | 213 | void bitmap_onto(unsigned long *dst, const unsigned long *orig, |
eb569883 | 214 | const unsigned long *relmap, unsigned int bits); |
98635b29 | 215 | void bitmap_fold(unsigned long *dst, const unsigned long *orig, |
b26ad583 | 216 | unsigned int sz, unsigned int nbits); |
98635b29 BG |
217 | int bitmap_find_free_region(unsigned long *bitmap, unsigned int bits, int order); |
218 | void bitmap_release_region(unsigned long *bitmap, unsigned int pos, int order); | |
219 | int bitmap_allocate_region(unsigned long *bitmap, unsigned int pos, int order); | |
3aa56885 | 220 | |
e8f24278 | 221 | #ifdef __BIG_ENDIAN |
98635b29 | 222 | void bitmap_copy_le(unsigned long *dst, const unsigned long *src, unsigned int nbits); |
e8f24278 RV |
223 | #else |
224 | #define bitmap_copy_le bitmap_copy | |
225 | #endif | |
98635b29 BG |
226 | unsigned int bitmap_ord_to_pos(const unsigned long *bitmap, unsigned int ord, unsigned int nbits); |
227 | int bitmap_print_to_pagebuf(bool list, char *buf, | |
5aaba363 | 228 | const unsigned long *maskp, int nmaskbits); |
1da177e4 | 229 | |
1fae5629 TT |
230 | extern int bitmap_print_bitmask_to_buf(char *buf, const unsigned long *maskp, |
231 | int nmaskbits, loff_t off, size_t count); | |
232 | ||
233 | extern int bitmap_print_list_to_buf(char *buf, const unsigned long *maskp, | |
234 | int nmaskbits, loff_t off, size_t count); | |
235 | ||
89c1e79e RV |
236 | #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1))) |
237 | #define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1))) | |
1da177e4 | 238 | |
8b4daad5 | 239 | static inline void bitmap_zero(unsigned long *dst, unsigned int nbits) |
1da177e4 | 240 | { |
c8cebc55 RV |
241 | unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
242 | memset(dst, 0, len); | |
1da177e4 LT |
243 | } |
244 | ||
8b4daad5 | 245 | static inline void bitmap_fill(unsigned long *dst, unsigned int nbits) |
1da177e4 | 246 | { |
c8cebc55 RV |
247 | unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
248 | memset(dst, 0xff, len); | |
1da177e4 LT |
249 | } |
250 | ||
251 | static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, | |
8b4daad5 | 252 | unsigned int nbits) |
1da177e4 | 253 | { |
c8cebc55 RV |
254 | unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); |
255 | memcpy(dst, src, len); | |
1da177e4 LT |
256 | } |
257 | ||
c724f193 YN |
258 | /* |
259 | * Copy bitmap and clear tail bits in last word. | |
260 | */ | |
261 | static inline void bitmap_copy_clear_tail(unsigned long *dst, | |
262 | const unsigned long *src, unsigned int nbits) | |
263 | { | |
264 | bitmap_copy(dst, src, nbits); | |
265 | if (nbits % BITS_PER_LONG) | |
266 | dst[nbits / BITS_PER_LONG] &= BITMAP_LAST_WORD_MASK(nbits); | |
267 | } | |
268 | ||
269 | /* | |
270 | * On 32-bit systems bitmaps are represented as u32 arrays internally, and | |
271 | * therefore conversion is not needed when copying data from/to arrays of u32. | |
272 | */ | |
273 | #if BITS_PER_LONG == 64 | |
98635b29 | 274 | void bitmap_from_arr32(unsigned long *bitmap, const u32 *buf, |
c724f193 | 275 | unsigned int nbits); |
98635b29 | 276 | void bitmap_to_arr32(u32 *buf, const unsigned long *bitmap, |
c724f193 YN |
277 | unsigned int nbits); |
278 | #else | |
279 | #define bitmap_from_arr32(bitmap, buf, nbits) \ | |
280 | bitmap_copy_clear_tail((unsigned long *) (bitmap), \ | |
281 | (const unsigned long *) (buf), (nbits)) | |
282 | #define bitmap_to_arr32(buf, bitmap, nbits) \ | |
283 | bitmap_copy_clear_tail((unsigned long *) (buf), \ | |
284 | (const unsigned long *) (bitmap), (nbits)) | |
285 | #endif | |
286 | ||
f4b0373b | 287 | static inline int bitmap_and(unsigned long *dst, const unsigned long *src1, |
2f9305eb | 288 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 289 | { |
4b0bc0bc | 290 | if (small_const_nbits(nbits)) |
7e5f97d1 | 291 | return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
f4b0373b | 292 | return __bitmap_and(dst, src1, src2, nbits); |
1da177e4 LT |
293 | } |
294 | ||
295 | static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, | |
2f9305eb | 296 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 297 | { |
4b0bc0bc | 298 | if (small_const_nbits(nbits)) |
1da177e4 LT |
299 | *dst = *src1 | *src2; |
300 | else | |
301 | __bitmap_or(dst, src1, src2, nbits); | |
302 | } | |
303 | ||
304 | static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1, | |
2f9305eb | 305 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 306 | { |
4b0bc0bc | 307 | if (small_const_nbits(nbits)) |
1da177e4 LT |
308 | *dst = *src1 ^ *src2; |
309 | else | |
310 | __bitmap_xor(dst, src1, src2, nbits); | |
311 | } | |
312 | ||
f4b0373b | 313 | static inline int bitmap_andnot(unsigned long *dst, const unsigned long *src1, |
2f9305eb | 314 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 315 | { |
4b0bc0bc | 316 | if (small_const_nbits(nbits)) |
74e76531 | 317 | return (*dst = *src1 & ~(*src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
f4b0373b | 318 | return __bitmap_andnot(dst, src1, src2, nbits); |
1da177e4 LT |
319 | } |
320 | ||
321 | static inline void bitmap_complement(unsigned long *dst, const unsigned long *src, | |
3d6684f4 | 322 | unsigned int nbits) |
1da177e4 | 323 | { |
4b0bc0bc | 324 | if (small_const_nbits(nbits)) |
65b4ee62 | 325 | *dst = ~(*src); |
1da177e4 LT |
326 | else |
327 | __bitmap_complement(dst, src, nbits); | |
328 | } | |
329 | ||
21035965 OS |
330 | #ifdef __LITTLE_ENDIAN |
331 | #define BITMAP_MEM_ALIGNMENT 8 | |
332 | #else | |
333 | #define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long)) | |
334 | #endif | |
335 | #define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1) | |
336 | ||
1da177e4 | 337 | static inline int bitmap_equal(const unsigned long *src1, |
3d6684f4 | 338 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 339 | { |
4b0bc0bc | 340 | if (small_const_nbits(nbits)) |
4b9d314c | 341 | return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits)); |
21035965 OS |
342 | if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) && |
343 | IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) | |
7dd96816 | 344 | return !memcmp(src1, src2, nbits / 8); |
4b9d314c | 345 | return __bitmap_equal(src1, src2, nbits); |
1da177e4 LT |
346 | } |
347 | ||
b9fa6442 | 348 | /** |
2a7e582f | 349 | * bitmap_or_equal - Check whether the or of two bitmaps is equal to a third |
b9fa6442 TG |
350 | * @src1: Pointer to bitmap 1 |
351 | * @src2: Pointer to bitmap 2 will be or'ed with bitmap 1 | |
352 | * @src3: Pointer to bitmap 3. Compare to the result of *@src1 | *@src2 | |
2a7e582f | 353 | * @nbits: number of bits in each of these bitmaps |
b9fa6442 TG |
354 | * |
355 | * Returns: True if (*@src1 | *@src2) == *@src3, false otherwise | |
356 | */ | |
357 | static inline bool bitmap_or_equal(const unsigned long *src1, | |
358 | const unsigned long *src2, | |
359 | const unsigned long *src3, | |
360 | unsigned int nbits) | |
361 | { | |
362 | if (!small_const_nbits(nbits)) | |
363 | return __bitmap_or_equal(src1, src2, src3, nbits); | |
364 | ||
365 | return !(((*src1 | *src2) ^ *src3) & BITMAP_LAST_WORD_MASK(nbits)); | |
366 | } | |
367 | ||
1da177e4 | 368 | static inline int bitmap_intersects(const unsigned long *src1, |
6dfe9799 | 369 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 370 | { |
4b0bc0bc | 371 | if (small_const_nbits(nbits)) |
1da177e4 LT |
372 | return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; |
373 | else | |
374 | return __bitmap_intersects(src1, src2, nbits); | |
375 | } | |
376 | ||
377 | static inline int bitmap_subset(const unsigned long *src1, | |
5be20213 | 378 | const unsigned long *src2, unsigned int nbits) |
1da177e4 | 379 | { |
4b0bc0bc | 380 | if (small_const_nbits(nbits)) |
1da177e4 LT |
381 | return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits)); |
382 | else | |
383 | return __bitmap_subset(src1, src2, nbits); | |
384 | } | |
385 | ||
0bb86779 | 386 | static inline bool bitmap_empty(const unsigned long *src, unsigned nbits) |
1da177e4 | 387 | { |
4b0bc0bc | 388 | if (small_const_nbits(nbits)) |
1da177e4 | 389 | return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); |
2afe27c7 YN |
390 | |
391 | return find_first_bit(src, nbits) == nbits; | |
1da177e4 LT |
392 | } |
393 | ||
0bb86779 | 394 | static inline bool bitmap_full(const unsigned long *src, unsigned int nbits) |
1da177e4 | 395 | { |
4b0bc0bc | 396 | if (small_const_nbits(nbits)) |
1da177e4 | 397 | return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits)); |
2afe27c7 YN |
398 | |
399 | return find_first_zero_bit(src, nbits) == nbits; | |
1da177e4 LT |
400 | } |
401 | ||
1a1d48a4 | 402 | static __always_inline int bitmap_weight(const unsigned long *src, unsigned int nbits) |
1da177e4 | 403 | { |
4b0bc0bc | 404 | if (small_const_nbits(nbits)) |
08cd3657 | 405 | return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); |
1da177e4 LT |
406 | return __bitmap_weight(src, nbits); |
407 | } | |
408 | ||
e5af323c MW |
409 | static __always_inline void bitmap_set(unsigned long *map, unsigned int start, |
410 | unsigned int nbits) | |
411 | { | |
412 | if (__builtin_constant_p(nbits) && nbits == 1) | |
413 | __set_bit(start, map); | |
21035965 OS |
414 | else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && |
415 | IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && | |
416 | __builtin_constant_p(nbits & BITMAP_MEM_MASK) && | |
417 | IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) | |
2a98dc02 | 418 | memset((char *)map + start / 8, 0xff, nbits / 8); |
e5af323c MW |
419 | else |
420 | __bitmap_set(map, start, nbits); | |
421 | } | |
422 | ||
423 | static __always_inline void bitmap_clear(unsigned long *map, unsigned int start, | |
424 | unsigned int nbits) | |
425 | { | |
426 | if (__builtin_constant_p(nbits) && nbits == 1) | |
427 | __clear_bit(start, map); | |
21035965 OS |
428 | else if (__builtin_constant_p(start & BITMAP_MEM_MASK) && |
429 | IS_ALIGNED(start, BITMAP_MEM_ALIGNMENT) && | |
430 | __builtin_constant_p(nbits & BITMAP_MEM_MASK) && | |
431 | IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT)) | |
2a98dc02 | 432 | memset((char *)map + start / 8, 0, nbits / 8); |
e5af323c MW |
433 | else |
434 | __bitmap_clear(map, start, nbits); | |
435 | } | |
436 | ||
2fbad299 | 437 | static inline void bitmap_shift_right(unsigned long *dst, const unsigned long *src, |
d9873969 | 438 | unsigned int shift, unsigned int nbits) |
1da177e4 | 439 | { |
4b0bc0bc | 440 | if (small_const_nbits(nbits)) |
2fbad299 | 441 | *dst = (*src & BITMAP_LAST_WORD_MASK(nbits)) >> shift; |
1da177e4 | 442 | else |
2fbad299 | 443 | __bitmap_shift_right(dst, src, shift, nbits); |
1da177e4 LT |
444 | } |
445 | ||
dba94c25 RV |
446 | static inline void bitmap_shift_left(unsigned long *dst, const unsigned long *src, |
447 | unsigned int shift, unsigned int nbits) | |
1da177e4 | 448 | { |
4b0bc0bc | 449 | if (small_const_nbits(nbits)) |
dba94c25 | 450 | *dst = (*src << shift) & BITMAP_LAST_WORD_MASK(nbits); |
1da177e4 | 451 | else |
dba94c25 | 452 | __bitmap_shift_left(dst, src, shift, nbits); |
1da177e4 LT |
453 | } |
454 | ||
30544ed5 AS |
455 | static inline void bitmap_replace(unsigned long *dst, |
456 | const unsigned long *old, | |
457 | const unsigned long *new, | |
458 | const unsigned long *mask, | |
459 | unsigned int nbits) | |
460 | { | |
461 | if (small_const_nbits(nbits)) | |
462 | *dst = (*old & ~(*mask)) | (*new & *mask); | |
463 | else | |
464 | __bitmap_replace(dst, old, new, mask, nbits); | |
465 | } | |
466 | ||
e837dfde DZ |
467 | static inline void bitmap_next_clear_region(unsigned long *bitmap, |
468 | unsigned int *rs, unsigned int *re, | |
469 | unsigned int end) | |
470 | { | |
471 | *rs = find_next_zero_bit(bitmap, end, *rs); | |
472 | *re = find_next_bit(bitmap, end, *rs + 1); | |
473 | } | |
474 | ||
475 | static inline void bitmap_next_set_region(unsigned long *bitmap, | |
476 | unsigned int *rs, unsigned int *re, | |
477 | unsigned int end) | |
478 | { | |
479 | *rs = find_next_bit(bitmap, end, *rs); | |
480 | *re = find_next_zero_bit(bitmap, end, *rs + 1); | |
481 | } | |
482 | ||
483 | /* | |
484 | * Bitmap region iterators. Iterates over the bitmap between [@start, @end). | |
485 | * @rs and @re should be integer variables and will be set to start and end | |
486 | * index of the current clear or set region. | |
487 | */ | |
488 | #define bitmap_for_each_clear_region(bitmap, rs, re, start, end) \ | |
489 | for ((rs) = (start), \ | |
490 | bitmap_next_clear_region((bitmap), &(rs), &(re), (end)); \ | |
491 | (rs) < (re); \ | |
492 | (rs) = (re) + 1, \ | |
493 | bitmap_next_clear_region((bitmap), &(rs), &(re), (end))) | |
494 | ||
495 | #define bitmap_for_each_set_region(bitmap, rs, re, start, end) \ | |
496 | for ((rs) = (start), \ | |
497 | bitmap_next_set_region((bitmap), &(rs), &(re), (end)); \ | |
498 | (rs) < (re); \ | |
499 | (rs) = (re) + 1, \ | |
500 | bitmap_next_set_region((bitmap), &(rs), &(re), (end))) | |
501 | ||
404376af | 502 | /** |
60ef6900 | 503 | * BITMAP_FROM_U64() - Represent u64 value in the format suitable for bitmap. |
404376af | 504 | * @n: u64 value |
60ef6900 YN |
505 | * |
506 | * Linux bitmaps are internally arrays of unsigned longs, i.e. 32-bit | |
507 | * integers in 32-bit environment, and 64-bit integers in 64-bit one. | |
508 | * | |
509 | * There are four combinations of endianness and length of the word in linux | |
510 | * ABIs: LE64, BE64, LE32 and BE32. | |
511 | * | |
512 | * On 64-bit kernels 64-bit LE and BE numbers are naturally ordered in | |
513 | * bitmaps and therefore don't require any special handling. | |
514 | * | |
515 | * On 32-bit kernels 32-bit LE ABI orders lo word of 64-bit number in memory | |
516 | * prior to hi, and 32-bit BE orders hi word prior to lo. The bitmap on the | |
517 | * other hand is represented as an array of 32-bit words and the position of | |
518 | * bit N may therefore be calculated as: word #(N/32) and bit #(N%32) in that | |
519 | * word. For example, bit #42 is located at 10th position of 2nd word. | |
520 | * It matches 32-bit LE ABI, and we can simply let the compiler store 64-bit | |
521 | * values in memory as it usually does. But for BE we need to swap hi and lo | |
522 | * words manually. | |
523 | * | |
524 | * With all that, the macro BITMAP_FROM_U64() does explicit reordering of hi and | |
525 | * lo parts of u64. For LE32 it does nothing, and for BE environment it swaps | |
526 | * hi and lo words, as is expected by bitmap. | |
527 | */ | |
528 | #if __BITS_PER_LONG == 64 | |
529 | #define BITMAP_FROM_U64(n) (n) | |
530 | #else | |
531 | #define BITMAP_FROM_U64(n) ((unsigned long) ((u64)(n) & ULONG_MAX)), \ | |
532 | ((unsigned long) ((u64)(n) >> 32)) | |
533 | #endif | |
534 | ||
404376af | 535 | /** |
29dd3288 MS |
536 | * bitmap_from_u64 - Check and swap words within u64. |
537 | * @mask: source bitmap | |
538 | * @dst: destination bitmap | |
539 | * | |
404376af | 540 | * In 32-bit Big Endian kernel, when using ``(u32 *)(&val)[*]`` |
29dd3288 | 541 | * to read u64 mask, we will get the wrong word. |
404376af | 542 | * That is ``(u32 *)(&val)[0]`` gets the upper 32 bits, |
29dd3288 MS |
543 | * but we expect the lower 32-bits of u64. |
544 | */ | |
545 | static inline void bitmap_from_u64(unsigned long *dst, u64 mask) | |
546 | { | |
547 | dst[0] = mask & ULONG_MAX; | |
548 | ||
549 | if (sizeof(mask) > sizeof(unsigned long)) | |
550 | dst[1] = mask >> 32; | |
551 | } | |
552 | ||
169c474f WBG |
553 | /** |
554 | * bitmap_get_value8 - get an 8-bit value within a memory region | |
555 | * @map: address to the bitmap memory region | |
556 | * @start: bit offset of the 8-bit value; must be a multiple of 8 | |
557 | * | |
558 | * Returns the 8-bit value located at the @start bit offset within the @src | |
559 | * memory region. | |
560 | */ | |
561 | static inline unsigned long bitmap_get_value8(const unsigned long *map, | |
562 | unsigned long start) | |
563 | { | |
564 | const size_t index = BIT_WORD(start); | |
565 | const unsigned long offset = start % BITS_PER_LONG; | |
566 | ||
567 | return (map[index] >> offset) & 0xFF; | |
568 | } | |
569 | ||
570 | /** | |
571 | * bitmap_set_value8 - set an 8-bit value within a memory region | |
572 | * @map: address to the bitmap memory region | |
573 | * @value: the 8-bit value; values wider than 8 bits may clobber bitmap | |
574 | * @start: bit offset of the 8-bit value; must be a multiple of 8 | |
575 | */ | |
576 | static inline void bitmap_set_value8(unsigned long *map, unsigned long value, | |
577 | unsigned long start) | |
578 | { | |
579 | const size_t index = BIT_WORD(start); | |
580 | const unsigned long offset = start % BITS_PER_LONG; | |
581 | ||
582 | map[index] &= ~(0xFFUL << offset); | |
583 | map[index] |= value << offset; | |
584 | } | |
585 | ||
1da177e4 LT |
586 | #endif /* __ASSEMBLY__ */ |
587 | ||
588 | #endif /* __LINUX_BITMAP_H */ |