tools/include/linux/bitmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _PERF_BITOPS_H
   3 #define _PERF_BITOPS_H
   4
   5 #include <string.h>
   6 #include <linux/bitops.h>
   7 #include <stdlib.h>
   8 #include <linux/kernel.h>
   9
  10 #define DECLARE_BITMAP(name,bits) \
  11         unsigned long name[BITS_TO_LONGS(bits)]
  12
  13 int __bitmap_weight(const unsigned long *bitmap, int bits);
  14 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  15                  const unsigned long *bitmap2, int bits);
  16 int __bitmap_and(unsigned long *dst, const unsigned long *bitmap1,
  17                  const unsigned long *bitmap2, unsigned int bits);
  18
  19 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
  20
  21 #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  22 (                                                                       \
  23         ((nbits) % BITS_PER_LONG) ?                                     \
  24                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  25 )
  26
  27 #define small_const_nbits(nbits) \
  28         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  29
  30 static inline void bitmap_zero(unsigned long *dst, int nbits)
  31 {
  32         if (small_const_nbits(nbits))
  33                 *dst = 0UL;
  34         else {
  35                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  36                 memset(dst, 0, len);
  37         }
  38 }
  39
  40 static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
  41 {
  42         unsigned int nlongs = BITS_TO_LONGS(nbits);
  43         if (!small_const_nbits(nbits)) {
  44                 unsigned int len = (nlongs - 1) * sizeof(unsigned long);
  45                 memset(dst, 0xff,  len);
  46         }
  47         dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  48 }
  49
  50 static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
  51 {
  52         if (small_const_nbits(nbits))
  53                 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  54
  55         return find_first_bit(src, nbits) == nbits;
  56 }
  57
  58 static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
  59 {
  60         if (small_const_nbits(nbits))
  61                 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  62
  63         return find_first_zero_bit(src, nbits) == nbits;
  64 }
  65
  66 static inline int bitmap_weight(const unsigned long *src, int nbits)
  67 {
  68         if (small_const_nbits(nbits))
  69                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  70         return __bitmap_weight(src, nbits);
  71 }
  72
  73 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  74                              const unsigned long *src2, int nbits)
  75 {
  76         if (small_const_nbits(nbits))
  77                 *dst = *src1 | *src2;
  78         else
  79                 __bitmap_or(dst, src1, src2, nbits);
  80 }
  81
  82 /**
  83  * test_and_set_bit - Set a bit and return its old value
  84  * @nr: Bit to set
  85  * @addr: Address to count from
  86  */
  87 static inline int test_and_set_bit(int nr, unsigned long *addr)
  88 {
  89         unsigned long mask = BIT_MASK(nr);
  90         unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
  91         unsigned long old;
  92
  93         old = *p;
  94         *p = old | mask;
  95
  96         return (old & mask) != 0;
  97 }
  98
  99 /**
 100  * bitmap_alloc - Allocate bitmap
 101  * @nr: Bit to set
 102  */
 103 static inline unsigned long *bitmap_alloc(int nbits)
 104 {
 105         return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
 106 }
 107
 108 /*
 109  * bitmap_scnprintf - print bitmap list into buffer
 110  * @bitmap: bitmap
 111  * @nbits: size of bitmap
 112  * @buf: buffer to store output
 113  * @size: size of @buf
 114  */
 115 size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
 116                         char *buf, size_t size);
 117
 118 /**
 119  * bitmap_and - Do logical and on bitmaps
 120  * @dst: resulting bitmap
 121  * @src1: operand 1
 122  * @src2: operand 2
 123  * @nbits: size of bitmap
 124  */
 125 static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
 126                              const unsigned long *src2, unsigned int nbits)
 127 {
 128         if (small_const_nbits(nbits))
 129                 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
 130         return __bitmap_and(dst, src1, src2, nbits);
 131 }
 132
 133 #endif /* _PERF_BITOPS_H */