root/tools/include/linux/bitmap.h

INCLUDED FROM

DEFINITIONS

1. bitmap_zero
2. bitmap_fill
3. bitmap_empty
4. bitmap_full
5. bitmap_weight
6. bitmap_or
7. test_and_set_bit
8. test_and_clear_bit
9. bitmap_alloc
10. bitmap_and

   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 void bitmap_clear(unsigned long *map, unsigned int start, int len);
  19 
  20 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
  21 
  22 #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  23 (                                                                       \
  24         ((nbits) % BITS_PER_LONG) ?                                     \
  25                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  26 )
  27 
  28 #define small_const_nbits(nbits) \
  29         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  30 
  31 static inline void bitmap_zero(unsigned long *dst, int nbits)
  32 {
  33         if (small_const_nbits(nbits))
  34                 *dst = 0UL;
  35         else {
  36                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  37                 memset(dst, 0, len);
  38         }
  39 }
  40 
  41 static inline void bitmap_fill(unsigned long *dst, unsigned int nbits)
  42 {
  43         unsigned int nlongs = BITS_TO_LONGS(nbits);
  44         if (!small_const_nbits(nbits)) {
  45                 unsigned int len = (nlongs - 1) * sizeof(unsigned long);
  46                 memset(dst, 0xff,  len);
  47         }
  48         dst[nlongs - 1] = BITMAP_LAST_WORD_MASK(nbits);
  49 }
  50 
  51 static inline int bitmap_empty(const unsigned long *src, unsigned nbits)
  52 {
  53         if (small_const_nbits(nbits))
  54                 return ! (*src & BITMAP_LAST_WORD_MASK(nbits));
  55 
  56         return find_first_bit(src, nbits) == nbits;
  57 }
  58 
  59 static inline int bitmap_full(const unsigned long *src, unsigned int nbits)
  60 {
  61         if (small_const_nbits(nbits))
  62                 return ! (~(*src) & BITMAP_LAST_WORD_MASK(nbits));
  63 
  64         return find_first_zero_bit(src, nbits) == nbits;
  65 }
  66 
  67 static inline int bitmap_weight(const unsigned long *src, int nbits)
  68 {
  69         if (small_const_nbits(nbits))
  70                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  71         return __bitmap_weight(src, nbits);
  72 }
  73 
  74 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  75                              const unsigned long *src2, int nbits)
  76 {
  77         if (small_const_nbits(nbits))
  78                 *dst = *src1 | *src2;
  79         else
  80                 __bitmap_or(dst, src1, src2, nbits);
  81 }
  82 
  83 /**
  84  * test_and_set_bit - Set a bit and return its old value
  85  * @nr: Bit to set
  86  * @addr: Address to count from
  87  */
  88 static inline int test_and_set_bit(int nr, unsigned long *addr)
  89 {
  90         unsigned long mask = BIT_MASK(nr);
  91         unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
  92         unsigned long old;
  93 
  94         old = *p;
  95         *p = old | mask;
  96 
  97         return (old & mask) != 0;
  98 }
  99 
 100 /**
 101  * test_and_clear_bit - Clear a bit and return its old value
 102  * @nr: Bit to clear
 103  * @addr: Address to count from
 104  */
 105 static inline int test_and_clear_bit(int nr, unsigned long *addr)
 106 {
 107         unsigned long mask = BIT_MASK(nr);
 108         unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
 109         unsigned long old;
 110 
 111         old = *p;
 112         *p = old & ~mask;
 113 
 114         return (old & mask) != 0;
 115 }
 116 
 117 /**
 118  * bitmap_alloc - Allocate bitmap
 119  * @nbits: Number of bits
 120  */
 121 static inline unsigned long *bitmap_alloc(int nbits)
 122 {
 123         return calloc(1, BITS_TO_LONGS(nbits) * sizeof(unsigned long));
 124 }
 125 
 126 /*
 127  * bitmap_scnprintf - print bitmap list into buffer
 128  * @bitmap: bitmap
 129  * @nbits: size of bitmap
 130  * @buf: buffer to store output
 131  * @size: size of @buf
 132  */
 133 size_t bitmap_scnprintf(unsigned long *bitmap, int nbits,
 134                         char *buf, size_t size);
 135 
 136 /**
 137  * bitmap_and - Do logical and on bitmaps
 138  * @dst: resulting bitmap
 139  * @src1: operand 1
 140  * @src2: operand 2
 141  * @nbits: size of bitmap
 142  */
 143 static inline int bitmap_and(unsigned long *dst, const unsigned long *src1,
 144                              const unsigned long *src2, unsigned int nbits)
 145 {
 146         if (small_const_nbits(nbits))
 147                 return (*dst = *src1 & *src2 & BITMAP_LAST_WORD_MASK(nbits)) != 0;
 148         return __bitmap_and(dst, src1, src2, nbits);
 149 }
 150 
 151 #endif /* _PERF_BITOPS_H */