1/* SPDX-License-Identifier: GPL-2.0 */
2
3#ifndef __ASM_S390_RWONCE_H
4#define __ASM_S390_RWONCE_H
5
6#include <linux/compiler_types.h>
7
8/*
9 * Use READ_ONCE_ALIGNED_128() for 128-bit block concurrent (atomic) read
10 * accesses. Note that x must be 128-bit aligned, otherwise a specification
11 * exception is generated.
12 */
13#define READ_ONCE_ALIGNED_128(x)			\
14({							\
15	union {						\
16		typeof(x) __x;				\
17		__uint128_t val;			\
18	} __u;						\
19							\
20	BUILD_BUG_ON(sizeof(x) != 16);			\
21	asm volatile(					\
22		"	lpq	%[val],%[_x]\n"		\
23		: [val] "=d" (__u.val)			\
24		: [_x] "QS" (x)				\
25		: "memory");				\
26	__u.__x;					\
27})
28
29#include <asm-generic/rwonce.h>
30
31#endif	/* __ASM_S390_RWONCE_H */
32