/* 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]\n"        \
        : [val] "=d" (__u.val)            \
        : [_x] "QS" (x)                \
        : "memory");                \
    __u.__x;                    \
})

#include <asm-generic/rwonce.h>

#endif    /* __ASM_S390_RWONCE_H */