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 */ 40 enum 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 yes 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 60 enum membarrier_cmd_flag { 61 MEMBARRIER_CMD_FLAG_CPU = 0x00000001, 62 }; 63 64 #ifndef _KERNEL 65 __BEGIN_DECLS 66 int membarrier(int, unsigned, int); 67 __END_DECLS 68 #endif /* _KERNEL */ 69 70 #endif /* __SYS_MEMBARRIER_H__ */ 71