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#ifndef __LINUX_BITMAP_H #define __LINUX_BITMAP_H #ifndef __ASSEMBLY__ #include <linux/types.h> #include <linux/bitops.h> #include <linux/string.h> /* * bitmaps provide bit arrays that consume one or more unsigned * longs. The bitmap interface and available operations are listed * here, in bitmap.h * * Function implementations generic to all architectures are in * lib/bitmap.c. Functions implementations that are architecture * specific are in various include/asm-<arch>/bitops.h headers * and other arch/<arch> specific files. * * See lib/bitmap.c for more details. */ /* * The available bitmap operations and their rough meaning in the * case that the bitmap is a single unsigned long are thus: * * bitmap_zero(dst, nbits) *dst = 0UL * bitmap_fill(dst, nbits) *dst = ~0UL * bitmap_copy(dst, src, nbits) *dst = *src * bitmap_and(dst, src1, src2, nbits) *dst = *src1 & *src2 * bitmap_or(dst, src1, src2, nbits) *dst = *src1 | *src2 * bitmap_xor(dst, src1, src2, nbits) *dst = *src1 ^ *src2 * bitmap_andnot(dst, src1, src2, nbits) *dst = *src1 & ~(*src2) * bitmap_complement(dst, src, nbits) *dst = ~(*src) * bitmap_equal(src1, src2, nbits) Are *src1 and *src2 equal? * bitmap_intersects(src1, src2, nbits) Do *src1 and *src2 overlap? * bitmap_subset(src1, src2, nbits) Is *src1 a subset of *src2? * bitmap_empty(src, nbits) Are all bits zero in *src? * bitmap_full(src, nbits) Are all bits set in *src? * bitmap_weight(src, nbits) Hamming Weight: number set bits * bitmap_shift_right(dst, src, n, nbits) *dst = *src >> n * bitmap_shift_left(dst, src, n, nbits) *dst = *src << n * bitmap_remap(dst, src, old, new, nbits) *dst = map(old, new)(src) * bitmap_bitremap(oldbit, old, new, nbits) newbit = map(old, new)(oldbit) * bitmap_scnprintf(buf, len, src, nbits) Print bitmap src to buf * bitmap_parse(ubuf, ulen, dst, nbits) Parse bitmap dst from user buf * bitmap_scnlistprintf(buf, len, src, nbits) Print bitmap src as list to buf * bitmap_parselist(buf, dst, nbits) Parse bitmap dst from list */ /* * Also the following operations in asm/bitops.h apply to bitmaps. * * set_bit(bit, addr) *addr |= bit * clear_bit(bit, addr) *addr &= ~bit * change_bit(bit, addr) *addr ^= bit * test_bit(bit, addr) Is bit set in *addr? * test_and_set_bit(bit, addr) Set bit and return old value * test_and_clear_bit(bit, addr) Clear bit and return old value * test_and_change_bit(bit, addr) Change bit and return old value * find_first_zero_bit(addr, nbits) Position first zero bit in *addr * find_first_bit(addr, nbits) Position first set bit in *addr * find_next_zero_bit(addr, nbits, bit) Position next zero bit in *addr >= bit * find_next_bit(addr, nbits, bit) Position next set bit in *addr >= bit */ /* * The DECLARE_BITMAP(name,bits) macro, in linux/types.h, can be used * to declare an array named 'name' of just enough unsigned longs to * contain all bit positions from 0 to 'bits' - 1. */ /* * lib/bitmap.c provides these functions: */ extern int __bitmap_empty(const unsigned long *bitmap, int bits); extern int __bitmap_full(const unsigned long *bitmap, int bits); extern int __bitmap_equal(const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern void __bitmap_complement(unsigned long *dst, const unsigned long *src, int bits); extern void __bitmap_shift_right(unsigned long *dst, const unsigned long *src, int shift, int bits); extern void __bitmap_shift_left(unsigned long *dst, const unsigned long *src, int shift, int bits); extern void __bitmap_and(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern void __bitmap_xor(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern void __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern int __bitmap_intersects(const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern int __bitmap_subset(const unsigned long *bitmap1, const unsigned long *bitmap2, int bits); extern int __bitmap_weight(const unsigned long *bitmap, int bits); extern int bitmap_scnprintf(char *buf, unsigned int len, const unsigned long *src, int nbits); extern int bitmap_parse(const char __user *ubuf, unsigned int ulen, unsigned long *dst, int nbits); extern int bitmap_scnlistprintf(char *buf, unsigned int len, const unsigned long *src, int nbits); extern int bitmap_parselist(const char *buf, unsigned long *maskp, int nmaskbits); extern void bitmap_remap(unsigned long *dst, const unsigned long *src, const unsigned long *old, const unsigned long *new, int bits); extern int bitmap_bitremap(int oldbit, const unsigned long *old, const unsigned long *new, int bits); extern int bitmap_find_free_region(unsigned long *bitmap, int bits, int order); extern void bitmap_release_region(unsigned long *bitmap, int pos, int order); extern int bitmap_allocate_region(unsigned long *bitmap, int pos, int order); #define BITMAP_LAST_WORD_MASK(nbits) \ ( \ ((nbits) % BITS_PER_LONG) ? \ (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL \ ) static inline void bitmap_zero(unsigned long *dst, int nbits) { if (nbits <= BITS_PER_LONG) *dst = 0UL; else { int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); memset(dst, 0, len); } } static inline void bitmap_fill(unsigned long *dst, int nbits) { size_t nlongs = BITS_TO_LONGS(nbits); if (nlongs > 1) { int len = (nlongs - 1) * sizeof(unsigned long); memset(dst, 0xff, len); } dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits); } static inline void bitmap_copy(unsigned long *dst, const unsigned long *src, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src; else { int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long); memcpy(dst, src, len); } } static inline void bitmap_and(unsigned long *dst, const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src1 & *src2; else __bitmap_and(dst, src1, src2, nbits); } static inline void bitmap_or(unsigned long *dst, const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src1 | *src2; else __bitmap_or(dst, src1, src2, nbits); } static inline void bitmap_xor(unsigned long *dst, const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src1 ^ *src2; else __bitmap_xor(dst, src1, src2, nbits); } static inline void bitmap_andnot(unsigned long *dst, const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src1 & ~(*src2); else __bitmap_andnot(dst, src1, src2, nbits); } static inline void bitmap_complement(unsigned long *dst, const unsigned long *src, int nbits) { if (nbits <= BITS_PER_LONG) *dst = ~(*src) & BITMAP_LAST_WORD_MASK(nbits); else __bitmap_complement(dst, src, nbits); } static inline int bitmap_equal(const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) return ! ((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits)); else return __bitmap_equal(src1, src2, nbits); } static inline int bitmap_intersects(const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0; else return __bitmap_intersects(src1, src2, nbits); } static inline int bitmap_subset(const unsigned long *src1, const unsigned long *src2, int nbits) { if (nbits <= BITS_PER_LONG) return ! ((*src1 & ~(*src2)) & BITMAP_LAST_WORD_MASK(nbits)); else return __bitmap_subset(src1, src2, nbits); } static inline int bitmap_empty(const unsigned long *src, int nbits) { if (nbits <= BITS_PER_LONG) return ! (*src & BITMAP_LAST_WORD_MASK(nbits)); else return __bitmap_empty(src, nbits); } static inline int bitmap_full(const unsigned long *src, int nbits) { if (nbits <= BITS_PER_LONG) return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits)); else return __bitmap_full(src, nbits); } static inline int bitmap_weight(const unsigned long *src, int nbits) { return __bitmap_weight(src, nbits); } static inline void bitmap_shift_right(unsigned long *dst, const unsigned long *src, int n, int nbits) { if (nbits <= BITS_PER_LONG) *dst = *src >> n; else __bitmap_shift_right(dst, src, n, nbits); } static inline void bitmap_shift_left(unsigned long *dst, const unsigned long *src, int n, int nbits) { if (nbits <= BITS_PER_LONG) *dst = (*src << n) & BITMAP_LAST_WORD_MASK(nbits); else __bitmap_shift_left(dst, src, n, nbits); } #endif /* __ASSEMBLY__ */ #endif /* __LINUX_BITMAP_H */