2 * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
4 * This file is licensed under the terms of the GNU General Public License
5 * version 2. This program is licensed "as is" without any warranty of any
6 * kind, whether express or implied.
9 #ifndef __ASM_OPENRISC_ATOMIC_H
10 #define __ASM_OPENRISC_ATOMIC_H
12 #include <linux/types.h>
14 /* Atomically perform op with v->counter and i */
15 #define ATOMIC_OP(op) \
16 static inline void atomic_##op(int i, atomic_t *v) \
20 __asm__ __volatile__( \
21 "1: l.lwa %0,0(%1) \n" \
22 " l." #op " %0,%0,%2 \n" \
23 " l.swa 0(%1),%0 \n" \
27 : "r"(&v->counter), "r"(i) \
31 /* Atomically perform op with v->counter and i, return the result */
32 #define ATOMIC_OP_RETURN(op) \
33 static inline int atomic_##op##_return(int i, atomic_t *v) \
37 __asm__ __volatile__( \
38 "1: l.lwa %0,0(%1) \n" \
39 " l." #op " %0,%0,%2 \n" \
40 " l.swa 0(%1),%0 \n" \
44 : "r"(&v->counter), "r"(i) \
50 /* Atomically perform op with v->counter and i, return orig v->counter */
51 #define ATOMIC_FETCH_OP(op) \
52 static inline int atomic_fetch_##op(int i, atomic_t *v) \
56 __asm__ __volatile__( \
57 "1: l.lwa %0,0(%2) \n" \
58 " l." #op " %1,%0,%3 \n" \
59 " l.swa 0(%2),%1 \n" \
62 : "=&r"(old), "=&r"(tmp) \
63 : "r"(&v->counter), "r"(i) \
82 #undef ATOMIC_FETCH_OP
83 #undef ATOMIC_OP_RETURN
86 #define atomic_add_return atomic_add_return
87 #define atomic_sub_return atomic_sub_return
88 #define atomic_fetch_add atomic_fetch_add
89 #define atomic_fetch_sub atomic_fetch_sub
90 #define atomic_fetch_and atomic_fetch_and
91 #define atomic_fetch_or atomic_fetch_or
92 #define atomic_fetch_xor atomic_fetch_xor
93 #define atomic_and atomic_and
94 #define atomic_or atomic_or
95 #define atomic_xor atomic_xor
98 * Atomically add a to v->counter as long as v is not already u.
99 * Returns the original value at v->counter.
101 * This is often used through atomic_inc_not_zero()
103 static inline int __atomic_add_unless(atomic_t *v, int a, int u)
107 __asm__ __volatile__(
108 "1: l.lwa %0, 0(%2) \n"
111 " l.add %1, %0, %3 \n"
112 " l.swa 0(%2), %1 \n"
116 : "=&r"(old), "=&r" (tmp)
117 : "r"(&v->counter), "r"(a), "r"(u)
122 #define __atomic_add_unless __atomic_add_unless
124 #include <asm-generic/atomic.h>
126 #endif /* __ASM_OPENRISC_ATOMIC_H */