1/*-
2 * Copyright (c) 2021 The FreeBSD Foundation
3 *
4 * This software were developed by Konstantin Belousov <kib@FreeBSD.org>
5 * under sponsorship from the FreeBSD Foundation.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef __SYS_MEMBARRIER_H__
30#define __SYS_MEMBARRIER_H__
31
32#include <sys/cdefs.h>
33
34/*
35 * The enum membarrier_cmd values are bits. The MEMBARRIER_CMD_QUERY
36 * command returns a bitset indicating which commands are supported.
37 * Also the value of MEMBARRIER_CMD_QUERY is zero, so it is
38 * effectively not returned by the query.
39 */
40enum membarrier_cmd {
41 MEMBARRIER_CMD_QUERY = 0x00000000,
42 MEMBARRIER_CMD_GLOBAL = 0x00000001,
43 MEMBARRIER_CMD_SHARED = MEMBARRIER_CMD_GLOBAL,
44 MEMBARRIER_CMD_GLOBAL_EXPEDITED = 0x00000002,
45 MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED = 0x00000004,
46 MEMBARRIER_CMD_PRIVATE_EXPEDITED = 0x00000008,
47 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED = 0x00000010,
48 MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE = 0x00000020,
49 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE = 0x00000040,
50
51 /*
52 * RSEQ constants are defined for source compatibility but are
53 * not yet supported, MEMBARRIER_CMD_QUERY does not return
54 * them in the mask.
55 */
56 MEMBARRIER_CMD_PRIVATE_EXPEDITED_RSEQ = 0x00000080,
57 MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_RSEQ = 0x00000100,
58};
59
60enum membarrier_cmd_flag {
61 MEMBARRIER_CMD_FLAG_CPU = 0x00000001,
62};
63
64#ifndef _KERNEL
65__BEGIN_DECLS
66int membarrier(int, unsigned, int);
67__END_DECLS
68#endif /* _KERNEL */
69
70#endif /* __SYS_MEMBARRIER_H__ */