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 void __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 void __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); 132 133 #define BITMAP_LAST_WORD_MASK(nbits) \ 134 ( \ 135 ((nbits) % BITS_PER_LONG) ? \ 136 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ 137 ) 138 139 static inline void bitmap_zero(unsigned long *dst, int nbits) 140 { 141 if (nbits <= BITS_PER_LONG) 142 *dst = 0UL; 143 else { 144 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); 145 memset(dst, 0, len); 146 } 147 } 148 149 static inline void bitmap_fill(unsigned long *dst, int nbits) 150 { 151 size_t nlongs = BITS_TO_LONGS(nbits); 152 if (nlongs > 1) { 153 int len = (nlongs - 1) * sizeof(unsigned long); 154 memset(dst, 0xff, len); 155 } 156 dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits); 157 } 158 159 static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, 160 int nbits) 161 { 162 if (nbits <= BITS_PER_LONG) 163 *dst = *src; 164 else { 165 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); 166 memcpy(dst, src, len); 167 } 168 } 169 170 static inline void bitmap_and(unsigned long *dst, const unsigned long *src1, 171 const unsigned long *src2, int nbits) 172 { 173 if (nbits <= BITS_PER_LONG) 174 *dst = *src1 & *src2; 175 else 176 __bitmap_and(dst, src1, src2, nbits); 177 } 178 179 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, 180 const unsigned long *src2, int nbits) 181 { 182 if (nbits <= BITS_PER_LONG) 183 *dst = *src1 | *src2; 184 else 185 __bitmap_or(dst, src1, src2, nbits); 186 } 187 188 static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1, 189 const unsigned long *src2, int nbits) 190 { 191 if (nbits <= BITS_PER_LONG) 192 *dst = *src1 ^ *src2; 193 else 194 __bitmap_xor(dst, src1, src2, nbits); 195 } 196 197 static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1, 198 const unsigned long *src2, int nbits) 199 { 200 if (nbits <= BITS_PER_LONG) 201 *dst = *src1 & ~(*src2); 202 else 203 __bitmap_andnot(dst, src1, src2, nbits); 204 } 205 206 static inline void bitmap_complement(unsigned long *dst, const unsigned long *src, 207 int nbits) 208 { 209 if (nbits <= BITS_PER_LONG) 210 *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits); 211 else 212 __bitmap_complement(dst, src, nbits); 213 } 214 215 static inline int bitmap_equal(const unsigned long *src1, 216 const unsigned long *src2, int nbits) 217 { 218 if (nbits <= BITS_PER_LONG) 219 return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits)); 220 else 221 return __bitmap_equal(src1, src2, nbits); 222 } 223 224 static inline int bitmap_intersects(const unsigned long *src1, 225 const unsigned long *src2, int nbits) 226 { 227 if (nbits <= BITS_PER_LONG) 228 return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; 229 else 230 return __bitmap_intersects(src1, src2, nbits); 231 } 232 233 static inline int bitmap_subset(const unsigned long *src1, 234 const unsigned long *src2, int nbits) 235 { 236 if (nbits <= BITS_PER_LONG) 237 return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits)); 238 else 239 return __bitmap_subset(src1, src2, nbits); 240 } 241 242 static inline int bitmap_empty(const unsigned long *src, int nbits) 243 { 244 if (nbits <= BITS_PER_LONG) 245 return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); 246 else 247 return __bitmap_empty(src, nbits); 248 } 249 250 static inline int bitmap_full(const unsigned long *src, int nbits) 251 { 252 if (nbits <= BITS_PER_LONG) 253 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits)); 254 else 255 return __bitmap_full(src, nbits); 256 } 257 258 static inline int bitmap_weight(const unsigned long *src, int nbits) 259 { 260 if (nbits <= BITS_PER_LONG) 261 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits)); 262 return __bitmap_weight(src, nbits); 263 } 264 265 static inline void bitmap_shift_right(unsigned long *dst, 266 const unsigned long *src, int n, int nbits) 267 { 268 if (nbits <= BITS_PER_LONG) 269 *dst = *src >> n; 270 else 271 __bitmap_shift_right(dst, src, n, nbits); 272 } 273 274 static inline void bitmap_shift_left(unsigned long *dst, 275 const unsigned long *src, int n, int nbits) 276 { 277 if (nbits <= BITS_PER_LONG) 278 *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits); 279 else 280 __bitmap_shift_left(dst, src, n, nbits); 281 } 282 283 static inline int bitmap_parse(const char *buf, unsigned int buflen, 284 unsigned long *maskp, int nmaskbits) 285 { 286 return __bitmap_parse(buf, buflen, 0, maskp, nmaskbits); 287 } 288 289 #endif /* __ASSEMBLY__ */ 290 291 #endif /* __LINUX_BITMAP_H */ 292