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fdfad810 MJ |
1 | /* |
2 | * Atomic exchange operations for the RISC-V architecture. Let GCC do it. | |
3 | * | |
4 | * Copyright (c) 2018 Michael Jeanson <mjeanson@efficios.com> | |
5 | * | |
6 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
7 | * of this software and associated documentation files (the "Software"), to | |
8 | * deal in the Software without restriction, including without limitation the | |
9 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
10 | * sell copies of the Software, and to permit persons to whom the Software is | |
11 | * furnished to do so, subject to the following conditions: | |
12 | * | |
13 | * The above copyright notice and this permission notice shall be included in | |
14 | * all copies or substantial portions of the Software. | |
15 | * | |
16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
17 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
19 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
20 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
21 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
22 | * IN THE SOFTWARE. | |
23 | */ | |
24 | ||
7645628a MD |
25 | #ifndef _URCU_ARCH_UATOMIC_RISCV_H |
26 | #define _URCU_ARCH_UATOMIC_RISCV_H | |
27 | ||
28 | #include <urcu/compiler.h> | |
29 | #include <urcu/system.h> | |
30 | ||
f097163a OD |
31 | /* |
32 | * See <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104831> for details. | |
33 | * | |
34 | * Until the following patches are backported, Userspace RCU is broken for the | |
35 | * RISC-V architecture when compiled with GCC. | |
36 | * | |
37 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4990cf84c460f064d6281d0813f20b0ef20c7448> | |
38 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=4990cf84c460f064d6281d0813f20b0ef20c7448> | |
39 | * - <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=d199d2e56da2379004e7e0457150409c0c99d3e6> | |
40 | */ | |
7645628a MD |
41 | #ifdef URCU_GCC_VERSION |
42 | # error "Implementations of some atomic operations of GCC for RISC-V are insufficient for sequential consistency. For this reason Userspace RCU is currently marked as 'broken' for RISC-V with GCC. However, it is still possible to use other toolchains." | |
f097163a OD |
43 | #endif |
44 | ||
fdfad810 MJ |
45 | #ifdef __cplusplus |
46 | extern "C" { | |
47 | #endif | |
48 | ||
49 | #define UATOMIC_HAS_ATOMIC_BYTE | |
50 | #define UATOMIC_HAS_ATOMIC_SHORT | |
51 | ||
52 | #ifdef __cplusplus | |
53 | } | |
54 | #endif | |
55 | ||
56 | #include <urcu/uatomic/generic.h> | |
57 | ||
58 | #endif /* _URCU_ARCH_UATOMIC_RISCV_H */ |