1/*
2 * Copyright © 2009 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 *
23 * Authors:
24 *    Chris Wilson <chris@chris-wilson.co.uk>
25 *
26 */
27
28#ifndef ATOMIC_H
29#define ATOMIC_H
30
31#if HAVE_ATOMIC_PRIMITIVES
32
33#define HAS_ATOMIC_OPS 1
34
35typedef struct {
36	int atomic;
37} atomic_t;
38
39# define atomic_read(x) ((x)->atomic)
40# define atomic_set(x, val) ((x)->atomic = (val))
41# define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
42# define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1)
43# define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
44# define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
45# define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
46
47#endif
48
49#if HAVE_LIB_ATOMIC_OPS
50#include <atomic_ops.h>
51
52#define HAS_ATOMIC_OPS 1
53
54typedef struct {
55	AO_t atomic;
56} atomic_t;
57
58# define atomic_read(x) AO_load_full(&(x)->atomic)
59# define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
60# define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
61# define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v)))
62# define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v)))
63# define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
64# define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv)
65
66#endif
67
68#if defined(__sun) && !defined(HAS_ATOMIC_OPS)  /* Solaris & OpenSolaris */
69
70#include <sys/atomic.h>
71#define HAS_ATOMIC_OPS 1
72
73typedef struct { uint_t atomic; } atomic_t;
74
75# define atomic_read(x) (int) ((x)->atomic)
76# define atomic_set(x, val) ((x)->atomic = (uint_t)(val))
77# define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
78# define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1)
79# define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
80# define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
81# define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv)
82
83#endif
84
85#if ! HAS_ATOMIC_OPS
86#error xf86-video-intel requires atomic operations, please define them for your CPU/compiler.
87#endif
88
89#endif
90