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  */
15 extern 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  */
30 extern 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  */
45 extern 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  */
59 extern 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  */
70 extern 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