/* SPDX-License-Identifier: GPL-2.0 */

#ifndef __ASM_S390_RWONCE_H
#define __ASM_S390_RWONCE_H

#include <linux/compiler_types.h>

/*
 * Use READ_ONCE_ALIGNED_128() for 128-bit block concurrent (atomic) read
 * accesses. Note that x must be 128-bit aligned, otherwise a specification
 * exception is generated.
 */
#define READ_ONCE_ALIGNED_128(x)                        \
({                                                      \
        union {                                         \
                typeof(x) __x;                          \
                __uint128_t val;                        \
        } __u;                                          \
                                                        \
        BUILD_BUG_ON(sizeof(x) != 16);                  \
        asm volatile(                                   \
                "       lpq     %[val],%[_x]"           \
                : [val] "=d" (__u.val)                  \
                : [_x] "QS" (x)                         \
                : "memory");                            \
        __u.__x;                                        \
})

#include <asm-generic/rwonce.h>

#endif  /* __ASM_S390_RWONCE_H */