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