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