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
set_bit(unsigned int nr,volatile unsigned long * p)14 static 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
clear_bit(unsigned int nr,volatile unsigned long * p)20 static 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
change_bit(unsigned int nr,volatile unsigned long * p)26 static 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
test_and_set_bit(unsigned int nr,volatile unsigned long * p)32 static 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
test_and_clear_bit(unsigned int nr,volatile unsigned long * p)42 static 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
test_and_change_bit(unsigned int nr,volatile unsigned long * p)52 static 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