summaryrefslogtreecommitdiffstats
path: root/include/asm-generic/bitops/atomic.h
blob: 71ab4ba9c25d189b2f018c4e5c6e46ee82ebd7a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_GENERIC_BITOPS_ATOMIC_H_
#define _ASM_GENERIC_BITOPS_ATOMIC_H_

#include <linux/atomic.h>
#include <linux/compiler.h>
#include <asm/barrier.h>

/*
 * Implementation of atomic bitops using atomic-fetch ops.
 * See Documentation/atomic_bitops.txt for details.
 */

static __always_inline void
arch_set_bit(unsigned int nr, volatile unsigned long *p)
{
	p += BIT_WORD(nr);
	arch_atomic_long_or(BIT_MASK(nr), (atomic_long_t *)p);
}

static __always_inline void
arch_clear_bit(unsigned int nr, volatile unsigned long *p)
{
	p += BIT_WORD(nr);
	arch_atomic_long_andnot(BIT_MASK(nr), (atomic_long_t *)p);
}

static __always_inline void
arch_change_bit(unsigned int nr, volatile unsigned long *p)
{
	p += BIT_WORD(nr);
	arch_atomic_long_xor(BIT_MASK(nr), (atomic_long_t *)p);
}

static __always_inline int
arch_test_and_set_bit(unsigned int nr, volatile unsigned long *p)
{
	long old;
	unsigned long mask = BIT_MASK(nr);

	p += BIT_WORD(nr);
	old = arch_atomic_long_fetch_or(mask, (atomic_long_t *)p);
	return !!(old & mask);
}

static __always_inline int
arch_test_and_clear_bit(unsigned int nr, volatile unsigned long *p)
{
	long old;
	unsigned long mask = BIT_MASK(nr);

	p += BIT_WORD(nr);
	old = arch_atomic_long_fetch_andnot(mask, (atomic_long_t *)p);
	return !!(old & mask);
}

static __always_inline int
arch_test_and_change_bit(unsigned int nr, volatile unsigned long *p)
{
	long old;
	unsigned long mask = BIT_MASK(nr);

	p += BIT_WORD(nr);
	old = arch_atomic_long_fetch_xor(mask, (atomic_long_t *)p);
	return !!(old & mask);
}

#include <asm-generic/bitops/instrumented-atomic.h>

#endif /* _ASM_GENERIC_BITOPS_ATOMIC_H */