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48 lines
1.2 KiB
48 lines
1.2 KiB
/* 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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#include <asm/atomic_ll_sc.h> |
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#ifdef 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/jump_label.h> |
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#include <linux/stringify.h> |
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#include <asm/alternative.h> |
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#include <asm/atomic_lse.h> |
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#include <asm/cpucaps.h> |
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extern struct static_key_false cpu_hwcap_keys[ARM64_NCAPS]; |
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extern struct static_key_false arm64_const_caps_ready; |
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static inline bool system_uses_lse_atomics(void) |
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{ |
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return (static_branch_likely(&arm64_const_caps_ready)) && |
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static_branch_likely(&cpu_hwcap_keys[ARM64_HAS_LSE_ATOMICS]); |
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} |
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#define __lse_ll_sc_body(op, ...) \ |
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({ \ |
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system_uses_lse_atomics() ? \ |
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__lse_##op(__VA_ARGS__) : \ |
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__ll_sc_##op(__VA_ARGS__); \ |
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}) |
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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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#else /* CONFIG_ARM64_LSE_ATOMICS */ |
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static inline bool system_uses_lse_atomics(void) { return false; } |
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#define __lse_ll_sc_body(op, ...) __ll_sc_##op(__VA_ARGS__) |
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#define ARM64_LSE_ATOMIC_INSN(llsc, lse) llsc |
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#endif /* CONFIG_ARM64_LSE_ATOMICS */ |
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#endif /* __ASM_LSE_H */
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