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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_LSE_H
3#define __ASM_LSE_H
4
5#include <asm/atomic_ll_sc.h>
6
7#ifdef CONFIG_ARM64_LSE_ATOMICS
8
9#define __LSE_PREAMBLE ".arch_extension lse\n"
10
11#include <linux/compiler_types.h>
12#include <linux/export.h>
13#include <linux/stringify.h>
14#include <asm/alternative.h>
15#include <asm/alternative-macros.h>
16#include <asm/atomic_lse.h>
17#include <asm/cpucaps.h>
18
19#define __lse_ll_sc_body(op, ...) \
20({ \
21 alternative_has_cap_likely(ARM64_HAS_LSE_ATOMICS) ? \
22 __lse_##op(__VA_ARGS__) : \
23 __ll_sc_##op(__VA_ARGS__); \
24})
25
26/* In-line patching at runtime */
27#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
28 ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
29
30#else /* CONFIG_ARM64_LSE_ATOMICS */
31
32#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__)
33
34#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
35
36#endif /* CONFIG_ARM64_LSE_ATOMICS */
37#endif /* __ASM_LSE_H */