1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_
3#define _ASM_GENERIC_BITOPS_ATOMIC_H_
4
5#include <linux/atomic.h>
6#include <linux/compiler.h>
7#include <asm/barrier.h>
8
9/*
10 * Implementation of atomic bitops using atomic-fetch ops.
11 * See Documentation/atomic_bitops.txt for details.
12 */
13
14static __always_inline void set_bit(unsigned int nr, volatile unsigned long *p)
15{
16	p += BIT_WORD(nr);
17	atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p);
18}
19
20static __always_inline void clear_bit(unsigned int nr, volatile unsigned long *p)
21{
22	p += BIT_WORD(nr);
23	atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p);
24}
25
26static __always_inline void change_bit(unsigned int nr, volatile unsigned long *p)
27{
28	p += BIT_WORD(nr);
29	atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p);
30}
31
32static inline int test_and_set_bit(unsigned int nr, volatile unsigned long *p)
33{
34	long old;
35	unsigned long mask = BIT_MASK(nr);
36
37	p += BIT_WORD(nr);
38	old = atomic_long_fetch_or(mask, (atomic_long_t *)p);
39	return !!(old & mask);
40}
41
42static inline int test_and_clear_bit(unsigned int nr, volatile unsigned long *p)
43{
44	long old;
45	unsigned long mask = BIT_MASK(nr);
46
47	p += BIT_WORD(nr);
48	old = atomic_long_fetch_andnot(mask, (atomic_long_t *)p);
49	return !!(old & mask);
50}
51
52static inline int test_and_change_bit(unsigned int nr, volatile unsigned long *p)
53{
54	long old;
55	unsigned long mask = BIT_MASK(nr);
56
57	p += BIT_WORD(nr);
58	old = atomic_long_fetch_xor(mask, (atomic_long_t *)p);
59	return !!(old & mask);
60}
61
62#endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */
63