tools/include/linux/bitops.h

   1 #ifndef _TOOLS_LINUX_BITOPS_H_
   2 #define _TOOLS_LINUX_BITOPS_H_
   3
   4 #include <asm/types.h>
   5 #include <linux/compiler.h>
   6
   7 #ifndef __WORDSIZE
   8 #define __WORDSIZE (__SIZEOF_LONG__ * 8)
   9 #endif
  10
  11 #ifndef BITS_PER_LONG
  12 # define BITS_PER_LONG __WORDSIZE
  13 #endif
  14
  15 #define BIT_MASK(nr)            (1UL << ((nr) % BITS_PER_LONG))
  16 #define BIT_WORD(nr)            ((nr) / BITS_PER_LONG)
  17 #define BITS_PER_BYTE           8
  18 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
  19 #define BITS_TO_U64(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
  20 #define BITS_TO_U32(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
  21 #define BITS_TO_BYTES(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE)
  22
  23 extern unsigned int __sw_hweight8(unsigned int w);
  24 extern unsigned int __sw_hweight16(unsigned int w);
  25 extern unsigned int __sw_hweight32(unsigned int w);
  26 extern unsigned long __sw_hweight64(__u64 w);
  27
  28 /*
  29  * Include this here because some architectures need generic_ffs/fls in
  30  * scope
  31  *
  32  * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
  33  */
  34 #include <asm-generic/bitops.h>
  35
  36 #define for_each_set_bit(bit, addr, size) \
  37         for ((bit) = find_first_bit((addr), (size));            \
  38              (bit) < (size);                                    \
  39              (bit) = find_next_bit((addr), (size), (bit) + 1))
  40
  41 #define for_each_clear_bit(bit, addr, size) \
  42         for ((bit) = find_first_zero_bit((addr), (size));       \
  43              (bit) < (size);                                    \
  44              (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
  45
  46 /* same as for_each_set_bit() but use bit as value to start with */
  47 #define for_each_set_bit_from(bit, addr, size) \
  48         for ((bit) = find_next_bit((addr), (size), (bit));      \
  49              (bit) < (size);                                    \
  50              (bit) = find_next_bit((addr), (size), (bit) + 1))
  51
  52 static inline unsigned long hweight_long(unsigned long w)
  53 {
  54         return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
  55 }
  56
  57 static inline unsigned fls_long(unsigned long l)
  58 {
  59         if (sizeof(l) == 4)
  60                 return fls(l);
  61         return fls64(l);
  62 }
  63
  64 /**
  65  * rol32 - rotate a 32-bit value left
  66  * @word: value to rotate
  67  * @shift: bits to roll
  68  */
  69 static inline __u32 rol32(__u32 word, unsigned int shift)
  70 {
  71         return (word << shift) | (word >> ((-shift) & 31));
  72 }
  73
  74 #endif