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
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