LXR linux/tools/include/linux/bitmap.h

   1#ifndef _PERF_BITOPS_H
   2#define _PERF_BITOPS_H
   3
   4#include <string.h>
   5#include <linux/bitops.h>
   6#include <stdlib.h>
   7
   8#define DECLARE_BITMAP(name,bits) \
   9        unsigned long name[BITS_TO_LONGS(bits)]
  10
  11int __bitmap_weight(const unsigned long *bitmap, int bits);
  12void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  13                 const unsigned long *bitmap2, int bits);
  14int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
  15                 const unsigned long *bitmap2, unsigned int bits);
  16
  17#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
  18
  19#define BITMAP_LAST_WORD_MASK(nbits)                                    \
  20(                                                                       \
  21        ((nbits) % BITS_PER_LONG) ?                                     \
  22                (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  23)
  24
  25#define small_const_nbits(nbits) \
  26        (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  27
  28static inline void bitmap_zero(unsigned long *dst, int nbits)
  29{
  30        if (small_const_nbits(nbits))
  31                *dst = 0UL;
  32        else {
  33                int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  34                memset(dst, 0, len);
  35        }
  36}
  37
  38static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
  39{
  40        unsigned int nlongs = BITS_TO_LONGS(nbits);
  41        if (!small_const_nbits(nbits)) {
  42                unsigned int len = (nlongs - 1) * sizeof(unsigned long);
  43                memset(dst, 0xff,  len);
  44        }
  45        dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  46}
  47
  48static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
  49{
  50        if (small_const_nbits(nbits))
  51                return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  52
  53        return find_first_bit(src, nbits) == nbits;
  54}
  55
  56static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
  57{
  58        if (small_const_nbits(nbits))
  59                return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  60
  61        return find_first_zero_bit(src, nbits) == nbits;
  62}
  63
  64static inline int bitmap_weight(const unsigned long *src, int nbits)
  65{
  66        if (small_const_nbits(nbits))
  67                return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  68        return __bitmap_weight(src, nbits);
  69}
  70
  71static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  72                             const unsigned long *src2, int nbits)
  73{
  74        if (small_const_nbits(nbits))
  75                *dst = *src1 | *src2;
  76        else
  77                __bitmap_or(dst, src1, src2, nbits);
  78}
  79
  80/**
  81 * test_and_set_bit - Set a bit and return its old value
  82 * @nr: Bit to set
  83 * @addr: Address to count from
  84 */
  85static inline int test_and_set_bit(int nr, unsigned long *addr)
  86{
  87        unsigned long mask = BIT_MASK(nr);
  88        unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
  89        unsigned long old;
  90
  91        old = *p;
  92        *p = old | mask;
  93
  94        return (old & mask) != 0;
  95}
  96
  97/**
  98 * test_and_clear_bit - Clear a bit and return its old value
  99 * @nr: Bit to clear
 100 * @addr: Address to count from
 101 */
 102static inline int test_and_clear_bit(int nr, unsigned long *addr)
 103{
 104        unsigned long mask = BIT_MASK(nr);
 105        unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 106        unsigned long old;
 107
 108        old = *p;
 109        *p = old & ~mask;
 110
 111        return (old & mask) != 0;
 112}
 113
 114/**
 115 * bitmap_alloc - Allocate bitmap
 116 * @nbits: Number of bits
 117 */
 118static inline unsigned long *bitmap_alloc(int nbits)
 119{
 120        return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
 121}
 122
 123/*
 124 * bitmap_scnprintf - print bitmap list into buffer
 125 * @bitmap: bitmap
 126 * @nbits: size of bitmap
 127 * @buf: buffer to store output
 128 * @size: size of @buf
 129 */
 130size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
 131                        char *buf, size_t size);
 132
 133/**
 134 * bitmap_and - Do logical and on bitmaps
 135 * @dst: resulting bitmap
 136 * @src1: operand 1
 137 * @src2: operand 2
 138 * @nbits: size of bitmap
 139 */
 140static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
 141                             const unsigned long *src2, unsigned int nbits)
 142{
 143        if (small_const_nbits(nbits))
 144                return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
 145        return __bitmap_and(dst, src1, src2, nbits);
 146}
 147
 148#endif /* _PERF_BITOPS_H */
 149