1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Interface for managing mitigations for Spectre vulnerabilities. 4 * 5 * Copyright (C) 2020 Google LLC 6 * Author: Will Deacon <will@kernel.org> 7 */ 8 9 #ifndef __ASM_SPECTRE_H 10 #define __ASM_SPECTRE_H 11 12 #include <asm/cpufeature.h> 13 14 /* Watch out, ordering is important here. */ 15 enum mitigation_state { 16 SPECTRE_UNAFFECTED, 17 SPECTRE_MITIGATED, 18 SPECTRE_VULNERABLE, 19 }; 20 21 struct task_struct; 22 23 enum mitigation_state arm64_get_spectre_v2_state(void); 24 bool has_spectre_v2(const struct arm64_cpu_capabilities *cap, int scope); 25 void spectre_v2_enable_mitigation(const struct arm64_cpu_capabilities *__unused); 26 27 enum mitigation_state arm64_get_spectre_v4_state(void); 28 bool has_spectre_v4(const struct arm64_cpu_capabilities *cap, int scope); 29 void spectre_v4_enable_mitigation(const struct arm64_cpu_capabilities *__unused); 30 void spectre_v4_enable_task_mitigation(struct task_struct *tsk); 31 32 enum mitigation_state arm64_get_meltdown_state(void); 33 34 #endif /* __ASM_SPECTRE_H */ 35