root/tools/include/linux/bitops.h

INCLUDED FROM

DEFINITIONS

1. hweight_long
2. fls_long
3. rol32

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _TOOLS_LINUX_BITOPS_H_
   3 #define _TOOLS_LINUX_BITOPS_H_
   4 
   5 #include <asm/types.h>
   6 #include <limits.h>
   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 #include <linux/bits.h>
  15 #include <linux/compiler.h>
  16 
  17 #define BITS_TO_LONGS(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
  18 #define BITS_TO_U64(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u64))
  19 #define BITS_TO_U32(nr)         DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(u32))
  20 #define BITS_TO_BYTES(nr)       DIV_ROUND_UP(nr, BITS_PER_BYTE)
  21 
  22 extern unsigned int __sw_hweight8(unsigned int w);
  23 extern unsigned int __sw_hweight16(unsigned int w);
  24 extern unsigned int __sw_hweight32(unsigned int w);
  25 extern unsigned long __sw_hweight64(__u64 w);
  26 
  27 /*
  28  * Include this here because some architectures need generic_ffs/fls in
  29  * scope
  30  *
  31  * XXX: this needs to be asm/bitops.h, when we get to per arch optimizations
  32  */
  33 #include <asm-generic/bitops.h>
  34 
  35 #define for_each_set_bit(bit, addr, size) \
  36         for ((bit) = find_first_bit((addr), (size));            \
  37              (bit) < (size);                                    \
  38              (bit) = find_next_bit((addr), (size), (bit) + 1))
  39 
  40 #define for_each_clear_bit(bit, addr, size) \
  41         for ((bit) = find_first_zero_bit((addr), (size));       \
  42              (bit) < (size);                                    \
  43              (bit) = find_next_zero_bit((addr), (size), (bit) + 1))
  44 
  45 /* same as for_each_set_bit() but use bit as value to start with */
  46 #define for_each_set_bit_from(bit, addr, size) \
  47         for ((bit) = find_next_bit((addr), (size), (bit));      \
  48              (bit) < (size);                                    \
  49              (bit) = find_next_bit((addr), (size), (bit) + 1))
  50 
  51 static inline unsigned long hweight_long(unsigned long w)
  52 {
  53         return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
  54 }
  55 
  56 static inline unsigned fls_long(unsigned long l)
  57 {
  58         if (sizeof(l) == 4)
  59                 return fls(l);
  60         return fls64(l);
  61 }
  62 
  63 /**
  64  * rol32 - rotate a 32-bit value left
  65  * @word: value to rotate
  66  * @shift: bits to roll
  67  */
  68 static inline __u32 rol32(__u32 word, unsigned int shift)
  69 {
  70         return (word << shift) | (word >> ((-shift) & 31));
  71 }
  72 
  73 #endif