153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _TOOLS_LINUX_BITMAP_H
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#define _TOOLS_LINUX_BITMAP_H
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#include <string.h>
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#include <linux/bitops.h>
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#include <linux/find.h>
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#include <stdlib.h>
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#include <linux/kernel.h>
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#define DECLARE_BITMAP(name,bits) \
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unsigned long name[BITS_TO_LONGS(bits)]
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unsigned int __bitmap_weight(const unsigned long *bitmap, int bits);
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void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, int bits);
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bool __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits);
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bool __bitmap_equal(const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits);
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void bitmap_clear(unsigned long *map, unsigned int start, int len);
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bool __bitmap_intersects(const unsigned long *bitmap1,
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const unsigned long *bitmap2, unsigned int bits);
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#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
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#define BITMAP_LAST_WORD_MASK(nbits) (~0UL >> (-(nbits) & (BITS_PER_LONG - 1)))
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static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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*dst = 0UL;
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else {
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int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
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memset(dst, 0, len);
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}
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}
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static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
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{
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unsigned int nlongs = BITS_TO_LONGS(nbits);
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if (!small_const_nbits(nbits)) {
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unsigned int len = (nlongs - 1) * sizeof(unsigned long);
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memset(dst, 0xff, len);
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}
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dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
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}
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static inline bool bitmap_empty(const unsigned long *src, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
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return find_first_bit(src, nbits) == nbits;
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}
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static inline bool bitmap_full(const unsigned long *src, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
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return find_first_zero_bit(src, nbits) == nbits;
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}
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static inline unsigned int bitmap_weight(const unsigned long *src, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
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return __bitmap_weight(src, nbits);
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}
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static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
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const unsigned long *src2, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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*dst = *src1 | *src2;
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else
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__bitmap_or(dst, src1, src2, nbits);
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}
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/**
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* bitmap_zalloc - Allocate bitmap
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* @nbits: Number of bits
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*/
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static inline unsigned long *bitmap_zalloc(int nbits)
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{
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return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
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}
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/*
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* bitmap_free - Free bitmap
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* @bitmap: pointer to bitmap
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*/
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static inline void bitmap_free(unsigned long *bitmap)
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{
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free(bitmap);
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}
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/*
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* bitmap_scnprintf - print bitmap list into buffer
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* @bitmap: bitmap
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* @nbits: size of bitmap
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* @buf: buffer to store output
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* @size: size of @buf
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*/
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size_t bitmap_scnprintf(unsigned long *bitmap, unsigned int nbits,
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char *buf, size_t size);
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/**
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* bitmap_and - Do logical and on bitmaps
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* @dst: resulting bitmap
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* @src1: operand 1
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* @src2: operand 2
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* @nbits: size of bitmap
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*/
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static inline bool bitmap_and(unsigned long *dst, const unsigned long *src1,
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const unsigned long *src2, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
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return __bitmap_and(dst, src1, src2, nbits);
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}
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#ifdef __LITTLE_ENDIAN
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#define BITMAP_MEM_ALIGNMENT 8
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#else
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#define BITMAP_MEM_ALIGNMENT (8 * sizeof(unsigned long))
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#endif
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#define BITMAP_MEM_MASK (BITMAP_MEM_ALIGNMENT - 1)
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#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
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static inline bool bitmap_equal(const unsigned long *src1,
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const unsigned long *src2, unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return !((*src1 ^ *src2) & BITMAP_LAST_WORD_MASK(nbits));
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if (__builtin_constant_p(nbits & BITMAP_MEM_MASK) &&
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IS_ALIGNED(nbits, BITMAP_MEM_ALIGNMENT))
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return !memcmp(src1, src2, nbits / 8);
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return __bitmap_equal(src1, src2, nbits);
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}
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static inline bool bitmap_intersects(const unsigned long *src1,
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const unsigned long *src2,
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unsigned int nbits)
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{
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if (small_const_nbits(nbits))
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return ((*src1 & *src2) & BITMAP_LAST_WORD_MASK(nbits)) != 0;
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else
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return __bitmap_intersects(src1, src2, nbits);
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}
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#endif /* _TOOLS_LINUX_BITMAP_H */
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