45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0 */
|
||
|
|
#ifndef __ASM_LSE_H
|
||
|
|
#define __ASM_LSE_H
|
||
|
|
|
||
|
|
#include <asm/atomic_ll_sc.h>
|
||
|
|
|
||
|
|
#ifdef CONFIG_ARM64_LSE_ATOMICS
|
||
|
|
|
||
|
|
#define __LSE_PREAMBLE ".arch_extension lse\n"
|
||
|
|
|
||
|
|
#include <linux/compiler_types.h>
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/stringify.h>
|
||
|
|
#include <asm/alternative.h>
|
||
|
|
#include <asm/alternative-macros.h>
|
||
|
|
#include <asm/atomic_lse.h>
|
||
|
|
#include <asm/cpucaps.h>
|
||
|
|
|
||
|
|
static __always_inline bool system_uses_lse_atomics(void)
|
||
|
|
{
|
||
|
|
return alternative_has_feature_likely(ARM64_HAS_LSE_ATOMICS);
|
||
|
|
}
|
||
|
|
|
||
|
|
#define __lse_ll_sc_body(op, ...) \
|
||
|
|
({ \
|
||
|
|
system_uses_lse_atomics() ? \
|
||
|
|
__lse_##op(__VA_ARGS__) : \
|
||
|
|
__ll_sc_##op(__VA_ARGS__); \
|
||
|
|
})
|
||
|
|
|
||
|
|
/* In-line patching at runtime */
|
||
|
|
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
|
||
|
|
ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
|
||
|
|
|
||
|
|
#else /* CONFIG_ARM64_LSE_ATOMICS */
|
||
|
|
|
||
|
|
static inline bool system_uses_lse_atomics(void) { return false; }
|
||
|
|
|
||
|
|
#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__)
|
||
|
|
|
||
|
|
#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
|
||
|
|
|
||
|
|
#endif /* CONFIG_ARM64_LSE_ATOMICS */
|
||
|
|
#endif /* __ASM_LSE_H */
|