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| 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]" \ |
| 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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