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
24extern unsigned int __sw_hweight8(unsigned int w);
25extern unsigned int __sw_hweight16(unsigned int w);
26extern unsigned int __sw_hweight32(unsigned int w);
27extern 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
53static inline unsigned long hweight_long(unsigned long w)
54{
55	return sizeof(w) == 4 ? hweight32(w) : hweight64(w);
56}
57
58static 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 */
70static inline __u32 rol32(__u32 word, unsigned int shift)
71{
72	return (word << shift) | (word >> ((-shift) & 31));
73}
74
75#endif