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
   7 #define DECLARE_BITMAP(name,bits) \
   8         unsigned long name[BITS_TO_LONGS(bits)]
   9
  10 int __bitmap_weight(const unsigned long *bitmap, int bits);
  11 void __bitmap_or(unsigned long *dst, const unsigned long *bitmap1,
  12                  const unsigned long *bitmap2, int bits);
  13
  14 #define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) & (BITS_PER_LONG - 1)))
  15
  16 #define BITMAP_LAST_WORD_MASK(nbits)                                    \
  17 (                                                                       \
  18         ((nbits) % BITS_PER_LONG) ?                                     \
  19                 (1UL<<((nbits) % BITS_PER_LONG))-1 : ~0UL               \
  20 )
  21
  22 #define small_const_nbits(nbits) \
  23         (__builtin_constant_p(nbits) && (nbits) <= BITS_PER_LONG)
  24
  25 static inline void bitmap_zero(unsigned long *dst, int nbits)
  26 {
  27         if (small_const_nbits(nbits))
  28                 *dst = 0UL;
  29         else {
  30                 int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
  31                 memset(dst, 0, len);
  32         }
  33 }
  34
  35 static inline int bitmap_weight(const unsigned long *src, int nbits)
  36 {
  37         if (small_const_nbits(nbits))
  38                 return hweight_long(*src & BITMAP_LAST_WORD_MASK(nbits));
  39         return __bitmap_weight(src, nbits);
  40 }
  41
  42 static inline void bitmap_or(unsigned long *dst, const unsigned long *src1,
  43                              const unsigned long *src2, int nbits)
  44 {
  45         if (small_const_nbits(nbits))
  46                 *dst = *src1 | *src2;
  47         else
  48                 __bitmap_or(dst, src1, src2, nbits);
  49 }
  50
  51 /**
  52  * test_and_set_bit - Set a bit and return its old value
  53  * @nr: Bit to set
  54  * @addr: Address to count from
  55  */
  56 static inline int test_and_set_bit(int nr, unsigned long *addr)
  57 {
  58         unsigned long mask = BIT_MASK(nr);
  59         unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
  60         unsigned long old;
  61
  62         old = *p;
  63         *p = old | mask;
  64
  65         return (old & mask) != 0;
  66 }
  67
  68 #endif /* _PERF_BITOPS_H */