1/* $OpenBSD: atomic.h,v 1.3 2020/07/08 15:53:59 visa Exp $ */
2
3/*
4 * Copyright (c) 2017 Visa Hankala
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _OCTEON_ATOMIC_H_
20#define _OCTEON_ATOMIC_H_
21
22#ifdef _KERNEL
23
24static inline void
25octeon_syncw(void)
26{
27 __asm__ volatile (
28 " .set push\n"
29 " .set arch=octeon\n"
30 /* Issue the barrier twice to work around CN3xxx erratum Core-401.
31 * A single syncw might not enforce write ordering properly. */
32 " syncw\n"
33 " syncw\n"
34 " .set pop\n"
35 : : : "memory");
36}
37
38#define membar_consumer() __asm__ volatile ("" : : : "memory")
39#define membar_producer() octeon_syncw()
40
41#endif /* _KERNEL */
42
43#include <mips64/atomic.h>
44
45#endif /* !_OCTEON_ATOMIC_H_ */