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73 lines
1.7 KiB
73 lines
1.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2022 ARM Ltd. |
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*/ |
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#ifndef __ASM_VECTORS_H |
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#define __ASM_VECTORS_H |
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#include <linux/bug.h> |
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#include <linux/percpu.h> |
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#include <asm/fixmap.h> |
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extern char vectors[]; |
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extern char tramp_vectors[]; |
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extern char __bp_harden_el1_vectors[]; |
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/* |
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* Note: the order of this enum corresponds to two arrays in entry.S: |
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* tramp_vecs and __bp_harden_el1_vectors. By default the canonical |
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* 'full fat' vectors are used directly. |
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*/ |
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enum arm64_bp_harden_el1_vectors { |
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#ifdef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY |
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/* |
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* Perform the BHB loop mitigation, before branching to the canonical |
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* vectors. |
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*/ |
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EL1_VECTOR_BHB_LOOP, |
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/* |
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* Make the SMC call for firmware mitigation, before branching to the |
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* canonical vectors. |
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*/ |
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EL1_VECTOR_BHB_FW, |
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/* |
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* Use the ClearBHB instruction, before branching to the canonical |
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* vectors. |
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*/ |
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EL1_VECTOR_BHB_CLEAR_INSN, |
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#endif /* CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */ |
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/* |
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* Remap the kernel before branching to the canonical vectors. |
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*/ |
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EL1_VECTOR_KPTI, |
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}; |
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#ifndef CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY |
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#define EL1_VECTOR_BHB_LOOP -1 |
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#define EL1_VECTOR_BHB_FW -1 |
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#define EL1_VECTOR_BHB_CLEAR_INSN -1 |
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#endif /* !CONFIG_MITIGATE_SPECTRE_BRANCH_HISTORY */ |
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/* The vectors to use on return from EL0. e.g. to remap the kernel */ |
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DECLARE_PER_CPU_READ_MOSTLY(const char *, this_cpu_vector); |
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#ifndef CONFIG_UNMAP_KERNEL_AT_EL0 |
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#define TRAMP_VALIAS 0 |
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#endif |
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static inline const char * |
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arm64_get_bp_hardening_vector(enum arm64_bp_harden_el1_vectors slot) |
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{ |
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if (arm64_kernel_unmapped_at_el0()) |
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return (char *)TRAMP_VALIAS + SZ_2K * slot; |
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WARN_ON_ONCE(slot == EL1_VECTOR_KPTI); |
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return __bp_harden_el1_vectors + SZ_2K * slot; |
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} |
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#endif /* __ASM_VECTORS_H */
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