1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_ATOMIC_IRQ_H
3 #define __ASM_SH_ATOMIC_IRQ_H
4
5 #include <linux/irqflags.h>
6
7 /*
8 * To get proper branch prediction for the main line, we must branch
9 * forward to code at the end of this object's .text section, then
10 * branch back to restart the operation.
11 */
12
13 #define ATOMIC_OP(op, c_op) \
14 static inline void arch_atomic_##op(int i, atomic_t *v) \
15 { \
16 unsigned long flags; \
17 \
18 raw_local_irq_save(flags); \
19 v->counter c_op i; \
20 raw_local_irq_restore(flags); \
21 }
22
23 #define ATOMIC_OP_RETURN(op, c_op) \
24 static inline int arch_atomic_##op##_return(int i, atomic_t *v) \
25 { \
26 unsigned long temp, flags; \
27 \
28 raw_local_irq_save(flags); \
29 temp = v->counter; \
30 temp c_op i; \
31 v->counter = temp; \
32 raw_local_irq_restore(flags); \
33 \
34 return temp; \
35 }
36
37 #define ATOMIC_FETCH_OP(op, c_op) \
38 static inline int arch_atomic_fetch_##op(int i, atomic_t *v) \
39 { \
40 unsigned long temp, flags; \
41 \
42 raw_local_irq_save(flags); \
43 temp = v->counter; \
44 v->counter c_op i; \
45 raw_local_irq_restore(flags); \
46 \
47 return temp; \
48 }
49
50 #define ATOMIC_OPS(op, c_op) \
51 ATOMIC_OP(op, c_op) \
52 ATOMIC_OP_RETURN(op, c_op) \
53 ATOMIC_FETCH_OP(op, c_op)
54
55 ATOMIC_OPS(add, +=)
56 ATOMIC_OPS(sub, -=)
57
58 #define arch_atomic_add_return arch_atomic_add_return
59 #define arch_atomic_sub_return arch_atomic_sub_return
60 #define arch_atomic_fetch_add arch_atomic_fetch_add
61 #define arch_atomic_fetch_sub arch_atomic_fetch_sub
62
63 #undef ATOMIC_OPS
64 #define ATOMIC_OPS(op, c_op) \
65 ATOMIC_OP(op, c_op) \
66 ATOMIC_FETCH_OP(op, c_op)
67
68 ATOMIC_OPS(and, &=)
69 ATOMIC_OPS(or, |=)
70 ATOMIC_OPS(xor, ^=)
71
72 #define arch_atomic_fetch_and arch_atomic_fetch_and
73 #define arch_atomic_fetch_or arch_atomic_fetch_or
74 #define arch_atomic_fetch_xor arch_atomic_fetch_xor
75
76 #undef ATOMIC_OPS
77 #undef ATOMIC_FETCH_OP
78 #undef ATOMIC_OP_RETURN
79 #undef ATOMIC_OP
80
81 #endif /* __ASM_SH_ATOMIC_IRQ_H */
82
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.