release/src-rt/linux/linux-2.6/include/linux/bitops.h

   1 #ifndef _LINUX_BITOPS_H
   2 #define _LINUX_BITOPS_H
   3 #include <asm/types.h>
   4
   5 #ifdef  __KERNEL__
   6 #define BIT(nr)                 (1UL << (nr))
   7 #define BIT_MASK(nr)            (1UL << ((nr) % BITS_PER_LONG))
   8 #define BIT_WORD(nr)            ((nr) / BITS_PER_LONG)
   9 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_LONG)
  10 #define BITS_PER_BYTE           8
  11 #endif
  12
  13 /*
  14  * Include this here because some architectures need generic_ffs/fls in
  15  * scope
  16  */
  17 #include <asm/bitops.h>
  18
  19 static __inline__ int get_bitmask_order(unsigned int count)
  20 {
  21         int order;
  22
  23         order = fls(count);
  24         return order;   /* We could be slightly more clever with -1 here... */
  25 }
  26
  27 static __inline__ int get_count_order(unsigned int count)
  28 {
  29         int order;
  30
  31         order = fls(count) - 1;
  32         if (count & (count - 1))
  33                 order++;
  34         return order;
  35 }
  36
  37 static inline unsigned long hweight_long(unsigned long w)
  38 {
  39         return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
  40 }
  41
  42 /**
  43  * rol32 - rotate a 32-bit value left
  44  * @word: value to rotate
  45  * @shift: bits to roll
  46  */
  47 static inline __u32 rol32(__u32 word, unsigned int shift)
  48 {
  49         return (word << shift) | (word >> (32 - shift));
  50 }
  51
  52 /**
  53  * ror32 - rotate a 32-bit value right
  54  * @word: value to rotate
  55  * @shift: bits to roll
  56  */
  57 static inline __u32 ror32(__u32 word, unsigned int shift)
  58 {
  59         return (word >> shift) | (word << (32 - shift));
  60 }
  61
  62 static inline unsigned fls_long(unsigned long l)
  63 {
  64         if (sizeof(l) == 4)
  65                 return fls(l);
  66         return fls64(l);
  67 }
  68
  69 #endif