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_PER_TYPE(type)	(sizeof(type) * BITS_PER_BYTE)
18#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_TYPE(long))
19#define BITS_TO_U64(nr)		DIV_ROUND_UP(nr, BITS_PER_TYPE(u64))
20#define BITS_TO_U32(nr)		DIV_ROUND_UP(nr, BITS_PER_TYPE(u32))
21#define BITS_TO_BYTES(nr)	DIV_ROUND_UP(nr, BITS_PER_TYPE(char))
22
23extern unsigned int __sw_hweight8(unsigned int w);
24extern unsigned int __sw_hweight16(unsigned int w);
25extern unsigned int __sw_hweight32(unsigned int w);
26extern 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
52static inline unsigned long hweight_long(unsigned long w)
53{
54	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
55}
56
57static 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 */
69static inline __u32 rol32(__u32 word, unsigned int shift)
70{
71	return (word << shift) | (word >> ((-shift) & 31));
72}
73
74#endif
75