tools/kvm/include/linux/bitops.h

   1 #ifndef _KVM_LINUX_BITOPS_H_
   2 #define _KVM_LINUX_BITOPS_H_
   3
   4 #include <linux/kernel.h>
   5 #include <linux/compiler.h>
   6 #include <asm/hweight.h>
   7
   8 #define BITS_PER_LONG __WORDSIZE
   9 #define BITS_PER_BYTE           8
  10 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
  11
  12 static inline void set_bit(int nr, unsigned long *addr)
  13 {
  14         addr[nr / BITS_PER_LONG] |= 1UL << (nr % BITS_PER_LONG);
  15 }
  16
  17 static inline void clear_bit(int nr, unsigned long *addr)
  18 {
  19         addr[nr / BITS_PER_LONG] &= ~(1UL << (nr % BITS_PER_LONG));
  20 }
  21
  22 static __always_inline int test_bit(unsigned int nr, const unsigned long *addr)
  23 {
  24         return ((1UL << (nr % BITS_PER_LONG)) &
  25                 (((unsigned long *)addr)[nr / BITS_PER_LONG])) != 0;
  26 }
  27
  28 static inline unsigned long hweight_long(unsigned long w)
  29 {
  30         return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
  31 }
  32
  33 #endif