58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_LSE_H
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#define __ASM_LSE_H
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#if defined(CONFIG_AS_LSE) && defined(CONFIG_ARM64_LSE_ATOMICS)
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#define __LSE_PREAMBLE ".arch_extension lse\n"
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#include <linux/compiler_types.h>
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#include <linux/export.h>
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#include <linux/stringify.h>
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#include <asm/alternative.h>
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#include <asm/cpucaps.h>
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#ifdef __ASSEMBLER__
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.arch_extension lse
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.macro alt_lse, llsc, lse
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alternative_insn "\llsc", "\lse", ARM64_HAS_LSE_ATOMICS
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.endm
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#else /* __ASSEMBLER__ */
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/* Move the ll/sc atomics out-of-line */
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#define __LL_SC_INLINE notrace
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#define __LL_SC_PREFIX(x) __ll_sc_##x
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#define __LL_SC_EXPORT(x) EXPORT_SYMBOL(__LL_SC_PREFIX(x))
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/* Macro for constructing calls to out-of-line ll/sc atomics */
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#define __LL_SC_CALL(op) "bl\t" __stringify(__LL_SC_PREFIX(op)) "\n"
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#define __LL_SC_CLOBBERS "x16", "x17", "x30"
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/* In-line patching at runtime */
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) \
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ALTERNATIVE(llsc, __LSE_PREAMBLE lse, ARM64_HAS_LSE_ATOMICS)
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#endif /* __ASSEMBLER__ */
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#else /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
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#ifdef __ASSEMBLER__
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.macro alt_lse, llsc, lse
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\llsc
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.endm
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#else /* __ASSEMBLER__ */
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#define __LL_SC_INLINE static inline
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#define __LL_SC_PREFIX(x) x
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#define __LL_SC_EXPORT(x)
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc
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#endif /* __ASSEMBLER__ */
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#endif /* CONFIG_AS_LSE && CONFIG_ARM64_LSE_ATOMICS */
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#endif /* __ASM_LSE_H */
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