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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Copied from the kernel sources:
4 *
5 * Copyright IBM Corp. 1999, 2009
6 *
7 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
8 */
9
10#ifndef __TOOLS_LINUX_ASM_BARRIER_H
11#define __TOOLS_LINUX_ASM_BARRIER_H
12
13/*
14 * Force strict CPU ordering.
15 * And yes, this is required on UP too when we're talking
16 * to devices.
17 */
18
19#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
20/* Fast-BCR without checkpoint synchronization */
21#define __ASM_BARRIER "bcr 14,0\n"
22#else
23#define __ASM_BARRIER "bcr 15,0\n"
24#endif
25
26#define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0)
27
28#define rmb() mb()
29#define wmb() mb()
30
31#endif /* __TOOLS_LIB_ASM_BARRIER_H */