1 /*
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
6 * UCRL-CODE-235197
7 *
8 * This file is part of the SPL, Solaris Porting Layer.
9 *
10 * The SPL is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 * The SPL is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
17 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 * for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
22 */
23
24 #ifndef _SPL_ATOMIC_H
25 #define _SPL_ATOMIC_H
26
27 #include <linux/module.h>
28 #include <linux/spinlock.h>
29 #include <sys/types.h>
30
31 /*
32 * Map the atomic_* functions to the Linux counterparts. This relies on the
33 * fact that the atomic types are internally really a uint32 or uint64. If
34 * this were to change an alternate approach would be needed.
35 *
36 * N.B. Due to the limitations of the original API atomicity is not strictly
37 * preserved when using the 64-bit functions on a 32-bit system. In order
38 * to support this all consumers would need to be updated to use the Linux
39 * provided atomic_t and atomic64_t types.
40 */
41 #define atomic_inc_32(v) atomic_inc((atomic_t *)(v))
42 #define atomic_dec_32(v) atomic_dec((atomic_t *)(v))
43 #define atomic_add_32(v, i) atomic_add((i), (atomic_t *)(v))
44 #define atomic_sub_32(v, i) atomic_sub((i), (atomic_t *)(v))
45 #define atomic_inc_32_nv(v) atomic_inc_return((atomic_t *)(v))
46 #define atomic_dec_32_nv(v) atomic_dec_return((atomic_t *)(v))
47 #define atomic_add_32_nv(v, i) atomic_add_return((i), (atomic_t *)(v))
48 #define atomic_sub_32_nv(v, i) atomic_sub_return((i), (atomic_t *)(v))
49 #define atomic_cas_32(v, x, y) atomic_cmpxchg((atomic_t *)(v), x, y)
50 #define atomic_swap_32(v, x) atomic_xchg((atomic_t *)(v), x)
51 #define atomic_load_32(v) atomic_read((atomic_t *)(v))
52 #define atomic_store_32(v, x) atomic_set((atomic_t *)(v), x)
53 #define atomic_inc_64(v) atomic64_inc((atomic64_t *)(v))
54 #define atomic_dec_64(v) atomic64_dec((atomic64_t *)(v))
55 #define atomic_add_64(v, i) atomic64_add((i), (atomic64_t *)(v))
56 #define atomic_sub_64(v, i) atomic64_sub((i), (atomic64_t *)(v))
57 #define atomic_inc_64_nv(v) atomic64_inc_return((atomic64_t *)(v))
58 #define atomic_dec_64_nv(v) atomic64_dec_return((atomic64_t *)(v))
59 #define atomic_add_64_nv(v, i) atomic64_add_return((i), (atomic64_t *)(v))
60 #define atomic_sub_64_nv(v, i) atomic64_sub_return((i), (atomic64_t *)(v))
61 #define atomic_cas_64(v, x, y) atomic64_cmpxchg((atomic64_t *)(v), x, y)
62 #define atomic_swap_64(v, x) atomic64_xchg((atomic64_t *)(v), x)
63 #define atomic_load_64(v) atomic64_read((atomic64_t *)(v))
64 #define atomic_store_64(v, x) atomic64_set((atomic64_t *)(v), x)
65
66 #ifdef _LP64
67 static __inline__ void *
atomic_cas_ptr(volatile void * target,void * cmp,void * newval)68 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
69 {
70 return ((void *)atomic_cas_64((volatile uint64_t *)target,
71 (uint64_t)cmp, (uint64_t)newval));
72 }
73 #else /* _LP64 */
74 static __inline__ void *
atomic_cas_ptr(volatile void * target,void * cmp,void * newval)75 atomic_cas_ptr(volatile void *target, void *cmp, void *newval)
76 {
77 return ((void *)atomic_cas_32((volatile uint32_t *)target,
78 (uint32_t)cmp, (uint32_t)newval));
79 }
80 #endif /* _LP64 */
81
82 #endif /* _SPL_ATOMIC_H */
83