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d3d3857f MJ |
1 | // SPDX-FileCopyrightText: 2018 Michael Jeanson <mjeanson@efficios.com> |
2 | // | |
3 | // SPDX-License-Identifier: MIT | |
4 | ||
fdfad810 | 5 | /* |
46980605 OD |
6 | * Atomic exchange operations for the RISC-V architecture. |
7 | * | |
8 | * Let the compiler do it. | |
fdfad810 MJ |
9 | */ |
10 | ||
4e7b1f99 MD |
11 | #ifndef _URCU_ARCH_UATOMIC_RISCV_H |
12 | #define _URCU_ARCH_UATOMIC_RISCV_H | |
13 | ||
14 | #include <urcu/compiler.h> | |
15 | #include <urcu/system.h> | |
16 | ||
46980605 OD |
17 | /* |
18 | * See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104831> for details. | |
19 | * | |
9a37bbc7 MJ |
20 | * The following GCC patches are required to have a working Userspace RCU on |
21 | * the RISC-V architecture. The were introduced in GCC 14 and backported to | |
22 | * 13.3.0. | |
46980605 | 23 | * |
9a37bbc7 | 24 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=dcd7b2f5f7233a04c8b14b362d0befa76e9654c0> |
46980605 OD |
25 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4990cf84c460f064d6281d0813f20b0ef20c7448> |
26 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d199d2e56da2379004e7e0457150409c0c99d3e6> | |
27 | */ | |
4e7b1f99 | 28 | #ifdef URCU_GCC_VERSION |
9a37bbc7 MJ |
29 | # if (URCU_GCC_VERSION < 130300) |
30 | # error "Implementations of some atomic operations of GCC < 13.3.0 for RISC-V are insufficient for sequential consistency. For this reason Userspace RCU is currently marked as 'broken' for RISC-V on these GCC versions." | |
31 | # endif | |
46980605 OD |
32 | #endif |
33 | ||
fdfad810 MJ |
34 | #ifdef __cplusplus |
35 | extern "C" { | |
36 | #endif | |
37 | ||
38 | #define UATOMIC_HAS_ATOMIC_BYTE | |
39 | #define UATOMIC_HAS_ATOMIC_SHORT | |
40 | ||
41 | #ifdef __cplusplus | |
42 | } | |
43 | #endif | |
44 | ||
45 | #include <urcu/uatomic/generic.h> | |
46 | ||
47 | #endif /* _URCU_ARCH_UATOMIC_RISCV_H */ |