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 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 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 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 #undef ATOMIC_OPS
59 #define ATOMIC_OPS(op, c_op) \
60 ATOMIC_OP(op, c_op) \
61 ATOMIC_FETCH_OP(op, c_op)
62
63 ATOMIC_OPS(and, &=)
64 ATOMIC_OPS(or, |=)
65 ATOMIC_OPS(xor, ^=)
66
67 #undef ATOMIC_OPS
68 #undef ATOMIC_FETCH_OP
69 #undef ATOMIC_OP_RETURN
70 #undef ATOMIC_OP
71
72 #endif /* __ASM_SH_ATOMIC_IRQ_H */