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 */ 262