1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_BITOPS_FIND_H_
3#define _ASM_GENERIC_BITOPS_FIND_H_
4
5#ifndef find_next_bit
6/**
7 * find_next_bit - find the next set bit in a memory region
8 * @addr: The address to base the search on
9 * @offset: The bitnumber to start searching at
10 * @size: The bitmap size in bits
11 *
12 * Returns the bit number for the next set bit
13 * If no bits are set, returns @size.
14 */
15extern unsigned long find_next_bit(const unsigned long *addr, unsigned long
16 size, unsigned long offset);
17#endif
18
19#ifndef find_next_and_bit
20/**
21 * find_next_and_bit - find the next set bit in both memory regions
22 * @addr1: The first address to base the search on
23 * @addr2: The second address to base the search on
24 * @offset: The bitnumber to start searching at
25 * @size: The bitmap size in bits
26 *
27 * Returns the bit number for the next set bit
28 * If no bits are set, returns @size.
29 */
30extern unsigned long find_next_and_bit(const unsigned long *addr1,
31 const unsigned long *addr2, unsigned long size,
32 unsigned long offset);
33#endif
34
35#ifndef find_next_zero_bit
36/**
37 * find_next_zero_bit - find the next cleared bit in a memory region
38 * @addr: The address to base the search on
39 * @offset: The bitnumber to start searching at
40 * @size: The bitmap size in bits
41 *
42 * Returns the bit number of the next zero bit
43 * If no bits are zero, returns @size.
44 */
45extern unsigned long find_next_zero_bit(const unsigned long *addr, unsigned
46 long size, unsigned long offset);
47#endif
48
49#ifdef CONFIG_GENERIC_FIND_FIRST_BIT
50
51/**
52 * find_first_bit - find the first set bit in a memory region
53 * @addr: The address to start the search at
54 * @size: The maximum number of bits to search
55 *
56 * Returns the bit number of the first set bit.
57 * If no bits are set, returns @size.
58 */
59extern unsigned long find_first_bit(const unsigned long *addr,
60 unsigned long size);
61
62/**
63 * find_first_zero_bit - find the first cleared bit in a memory region
64 * @addr: The address to start the search at
65 * @size: The maximum number of bits to search
66 *
67 * Returns the bit number of the first cleared bit.
68 * If no bits are zero, returns @size.
69 */
70extern unsigned long find_first_zero_bit(const unsigned long *addr,
71 unsigned long size);
72#else /* CONFIG_GENERIC_FIND_FIRST_BIT */
73
74#ifndef find_first_bit
75#define find_first_bit(addr, size) find_next_bit((addr), (size), 0)
76#endif
77#ifndef find_first_zero_bit
78#define find_first_zero_bit(addr, size) find_next_zero_bit((addr), (size), 0)
79#endif
80
81#endif /* CONFIG_GENERIC_FIND_FIRST_BIT */
82
83#endif /*_ASM_GENERIC_BITOPS_FIND_H_ */
84