tools/include/linux/bitops.h

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