1 /* 1
2 * Copyright (C) 2014 Stefan Kristiansson <ste
3 *
4 * This file is licensed under the terms of th
5 * version 2. This program is licensed "as is
6 * kind, whether express or implied.
7 */
8
9 #ifndef __ASM_OPENRISC_ATOMIC_H
10 #define __ASM_OPENRISC_ATOMIC_H
11
12 #include <linux/types.h>
13
14 /* Atomically perform op with v->counter and i
15 #define ATOMIC_OP(op)
16 static inline void arch_atomic_##op(int i, ato
17 {
18 int tmp;
19
20 __asm__ __volatile__(
21 "1: l.lwa %0,0(%1)
22 " l." #op " %0,%0,%2
23 " l.swa 0(%1),%0
24 " l.bnf 1b
25 " l.nop
26 : "=&r"(tmp)
27 : "r"(&v->counter), "r"(i)
28 : "cc", "memory");
29 }
30
31 /* Atomically perform op with v->counter and i
32 #define ATOMIC_OP_RETURN(op)
33 static inline int arch_atomic_##op##_return(in
34 {
35 int tmp;
36
37 __asm__ __volatile__(
38 "1: l.lwa %0,0(%1)
39 " l." #op " %0,%0,%2
40 " l.swa 0(%1),%0
41 " l.bnf 1b
42 " l.nop
43 : "=&r"(tmp)
44 : "r"(&v->counter), "r"(i)
45 : "cc", "memory");
46
47 return tmp;
48 }
49
50 /* Atomically perform op with v->counter and i
51 #define ATOMIC_FETCH_OP(op)
52 static inline int arch_atomic_fetch_##op(int i
53 {
54 int tmp, old;
55
56 __asm__ __volatile__(
57 "1: l.lwa %0,0(%2)
58 " l." #op " %1,%0,%3
59 " l.swa 0(%2),%1
60 " l.bnf 1b
61 " l.nop
62 : "=&r"(old), "=&r"(tmp)
63 : "r"(&v->counter), "r"(i)
64 : "cc", "memory");
65
66 return old;
67 }
68
69 ATOMIC_OP_RETURN(add)
70 ATOMIC_OP_RETURN(sub)
71
72 ATOMIC_FETCH_OP(add)
73 ATOMIC_FETCH_OP(sub)
74 ATOMIC_FETCH_OP(and)
75 ATOMIC_FETCH_OP(or)
76 ATOMIC_FETCH_OP(xor)
77
78 ATOMIC_OP(add)
79 ATOMIC_OP(sub)
80 ATOMIC_OP(and)
81 ATOMIC_OP(or)
82 ATOMIC_OP(xor)
83
84 #undef ATOMIC_FETCH_OP
85 #undef ATOMIC_OP_RETURN
86 #undef ATOMIC_OP
87
88 #define arch_atomic_add_return arch_atomic_ad
89 #define arch_atomic_sub_return arch_atomic_su
90 #define arch_atomic_fetch_add arch_atomic_fe
91 #define arch_atomic_fetch_sub arch_atomic_fe
92 #define arch_atomic_fetch_and arch_atomic_fe
93 #define arch_atomic_fetch_or arch_atomic_fe
94 #define arch_atomic_fetch_xor arch_atomic_fe
95 #define arch_atomic_add arch_atomic_ad
96 #define arch_atomic_sub arch_atomic_su
97 #define arch_atomic_and arch_atomic_an
98 #define arch_atomic_or arch_atomic_or
99 #define arch_atomic_xor arch_atomic_xo
100
101 /*
102 * Atomically add a to v->counter as long as v
103 * Returns the original value at v->counter.
104 *
105 * This is often used through atomic_inc_not_z
106 */
107 static inline int arch_atomic_fetch_add_unless
108 {
109 int old, tmp;
110
111 __asm__ __volatile__(
112 "1: l.lwa %0, 0(%2)
113 " l.sfeq %0, %4
114 " l.bf 2f
115 " l.add %1, %0, %3
116 " l.swa 0(%2), %1
117 " l.bnf 1b
118 " l.nop
119 "2:
120 : "=&r"(old), "=&r" (tmp)
121 : "r"(&v->counter), "r"(a), "r
122 : "cc", "memory");
123
124 return old;
125 }
126 #define arch_atomic_fetch_add_unless arch_a
127
128 #define arch_atomic_read(v) READ_O
129 #define arch_atomic_set(v,i) WRITE_
130
131 #include <asm/cmpxchg.h>
132
133 #endif /* __ASM_OPENRISC_ATOMIC_H */
134
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