1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 #ifndef __ASM_SH_ATOMIC_LLSC_H
3 #define __ASM_SH_ATOMIC_LLSC_H
4
5 /*
6 * SH-4A note:
7 *
8 * We basically get atomic_xxx_return() for fr
9 * atomic_xxx(). movli.l/movco.l require r0 du
10 * encoding, so the retval is automatically se
11 * do any special work.
12 */
13 /*
14 * To get proper branch prediction for the mai
15 * forward to code at the end of this object's
16 * branch back to restart the operation.
17 */
18
19 #define ATOMIC_OP(op)
20 static inline void arch_atomic_##op(int i, ato
21 {
22 unsigned long tmp;
23
24 __asm__ __volatile__ (
25 "1: movli.l @%2, %0 ! atomic_" #op
26 " " #op " %1, %0
27 " movco.l %0, @%2
28 " bf 1b
29 : "=&z" (tmp)
30 : "r" (i), "r" (&v->counter)
31 : "t");
32 }
33
34 #define ATOMIC_OP_RETURN(op)
35 static inline int arch_atomic_##op##_return(in
36 {
37 unsigned long temp;
38
39 __asm__ __volatile__ (
40 "1: movli.l @%2, %0 ! atomic_" #op
41 " " #op " %1, %0
42 " movco.l %0, @%2
43 " bf 1b
44 " synco
45 : "=&z" (temp)
46 : "r" (i), "r" (&v->counter)
47 : "t");
48
49 return temp;
50 }
51
52 #define ATOMIC_FETCH_OP(op)
53 static inline int arch_atomic_fetch_##op(int i
54 {
55 unsigned long res, temp;
56
57 __asm__ __volatile__ (
58 "1: movli.l @%3, %0 ! atomic_fetch
59 " mov %0, %1
60 " " #op " %2, %0
61 " movco.l %0, @%3
62 " bf 1b
63 " synco
64 : "=&z" (temp), "=&r" (res)
65 : "r" (i), "r" (&v->counter)
66 : "t");
67
68 return res;
69 }
70
71 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP
72
73 ATOMIC_OPS(add)
74 ATOMIC_OPS(sub)
75
76 #define arch_atomic_add_return arch_atomic_ad
77 #define arch_atomic_sub_return arch_atomic_su
78 #define arch_atomic_fetch_add arch_atomic_fe
79 #define arch_atomic_fetch_sub arch_atomic_fe
80
81 #undef ATOMIC_OPS
82 #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FE
83
84 ATOMIC_OPS(and)
85 ATOMIC_OPS(or)
86 ATOMIC_OPS(xor)
87
88 #define arch_atomic_fetch_and arch_atomic_fe
89 #define arch_atomic_fetch_or arch_atomic_fe
90 #define arch_atomic_fetch_xor arch_atomic_fe
91
92 #undef ATOMIC_OPS
93 #undef ATOMIC_FETCH_OP
94 #undef ATOMIC_OP_RETURN
95 #undef ATOMIC_OP
96
97 #endif /* __ASM_SH_ATOMIC_LLSC_H */
98
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