1/*
2 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
3 * Use is subject to license terms.
4 */
5/*
6 * \file drm_atomic.h
7 * Atomic operations used in the DRM which may or may not be provided by the OS.
8 *
9 * \author Eric Anholt <anholt@FreeBSD.org>
10 */
11
12/*
13 * Copyright 2004 Eric Anholt
14 * Copyright (c) 2009, Intel Corporation.
15 * All Rights Reserved.
16 *
17 * Permission is hereby granted, free of charge, to any person obtaining a
18 * copy of this software and associated documentation files (the "Software"),
19 * to deal in the Software without restriction, including without limitation
20 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
21 * and/or sell copies of the Software, and to permit persons to whom the
22 * Software is furnished to do so, subject to the following conditions:
23 *
24 * The above copyright notice and this permission notice (including the next
25 * paragraph) shall be included in all copies or substantial portions of the
26 * Software.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
29 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
30 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
31 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
32 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
33 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
34 * OTHER DEALINGS IN THE SOFTWARE.
35 */
36
37/* Many of these implementations are rather fake, but good enough. */
38
39
40
41#ifndef	_SYS_DRM_ATOMIC_H_
42#define	_SYS_DRM_ATOMIC_H_
43
44#ifdef	__cplusplus
45extern "C" {
46#endif
47
48#include <sys/atomic.h>
49
50#ifdef __LINT__
51#undef inline
52#define	inline
53#endif
54typedef uint32_t	atomic_t;
55
56#define	atomic_set(p, v)	(*(p) = (v))
57#define	atomic_read(p)		(*(p))
58#define	atomic_inc(p)		atomic_add_int(p, 1)
59#define	atomic_dec(p)		atomic_dec_uint(p)
60#define	atomic_add(n, p)	atomic_add_int(p, n)
61#define	atomic_sub(n, p)	atomic_add_int(p, -n)
62#define	atomic_set_int(p, bits)	atomic_or_uint(p, bits)
63#define	atomic_clear_int(p, bits)	atomic_and_uint(p, ~(bits))
64#define	atomic_cmpset_int(p, c, n) \
65	((c == atomic_cas_uint(p, c, n)) ? 1 : 0)
66
67#define	set_bit(b, p) \
68	atomic_set_int(((volatile uint_t *)(void *)p) + (b >> 5), \
69	1 << (b & 0x1f))
70
71#define	clear_bit(b, p) \
72	atomic_clear_int(((volatile uint_t *)(void *)p) + (b >> 5), \
73	1 << (b & 0x1f))
74
75#define	test_bit(b, p) \
76	(((volatile uint_t *)(void *)p)[b >> 5] & (1 << (b & 0x1f)))
77
78/*
79 * Note: this routine doesn't return old value. It return
80 * 0 when succeeds, or -1 when fails.
81 */
82#ifdef _LP64
83#define	test_and_set_bit(b, p) \
84	atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 6), (b & 0x3f))
85#else
86#define	test_and_set_bit(b, p) \
87	atomic_set_long_excl(((ulong_t *)(void *)p) + (b >> 5), (b & 0x1f))
88#endif
89
90#ifdef	__cplusplus
91}
92#endif
93
94#endif /* _SYS_DRM_ATOMIC_H_ */
95