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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e112b032a7
Currently in arm64, FDT is mapped to RO before it's passed to early_init_dt_scan(). However, there might be some codes (eg. commit "fdt: add support for rng-seed") that need to modify FDT during init. Map FDT to RO after early fixups are done. Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Will Deacon <will@kernel.org>
137 lines
3.7 KiB
C
137 lines
3.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_MMU_H
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#define __ASM_MMU_H
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#include <asm/cputype.h>
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#define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
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#define USER_ASID_BIT 48
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#define USER_ASID_FLAG (UL(1) << USER_ASID_BIT)
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#define TTBR_ASID_MASK (UL(0xffff) << 48)
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#define BP_HARDEN_EL2_SLOTS 4
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#ifndef __ASSEMBLY__
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typedef struct {
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atomic64_t id;
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void *vdso;
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unsigned long flags;
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} mm_context_t;
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/*
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* This macro is only used by the TLBI code, which cannot race with an
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* ASID change and therefore doesn't need to reload the counter using
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* atomic64_read.
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*/
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#define ASID(mm) ((mm)->context.id.counter & 0xffff)
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static inline bool arm64_kernel_unmapped_at_el0(void)
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{
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return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) &&
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cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
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}
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static inline bool arm64_kernel_use_ng_mappings(void)
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{
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bool tx1_bug;
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/* What's a kpti? Use global mappings if we don't know. */
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if (!IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0))
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return false;
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/*
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* Note: this function is called before the CPU capabilities have
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* been configured, so our early mappings will be global. If we
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* later determine that kpti is required, then
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* kpti_install_ng_mappings() will make them non-global.
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*/
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if (arm64_kernel_unmapped_at_el0())
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return true;
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if (!IS_ENABLED(CONFIG_RANDOMIZE_BASE))
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return false;
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/*
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* KASLR is enabled so we're going to be enabling kpti on non-broken
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* CPUs regardless of their susceptibility to Meltdown. Rather
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* than force everybody to go through the G -> nG dance later on,
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* just put down non-global mappings from the beginning.
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*/
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if (!IS_ENABLED(CONFIG_CAVIUM_ERRATUM_27456)) {
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tx1_bug = false;
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#ifndef MODULE
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} else if (!static_branch_likely(&arm64_const_caps_ready)) {
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extern const struct midr_range cavium_erratum_27456_cpus[];
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tx1_bug = is_midr_in_range_list(read_cpuid_id(),
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cavium_erratum_27456_cpus);
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#endif
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} else {
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tx1_bug = __cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_27456);
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}
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return !tx1_bug && kaslr_offset() > 0;
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}
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typedef void (*bp_hardening_cb_t)(void);
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struct bp_hardening_data {
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int hyp_vectors_slot;
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bp_hardening_cb_t fn;
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};
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#if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \
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defined(CONFIG_HARDEN_EL2_VECTORS))
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extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[];
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extern atomic_t arm64_el2_vector_last_slot;
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#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */
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#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
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DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
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static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
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{
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return this_cpu_ptr(&bp_hardening_data);
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}
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static inline void arm64_apply_bp_hardening(void)
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{
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struct bp_hardening_data *d;
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if (!cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
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return;
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d = arm64_get_bp_hardening_data();
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if (d->fn)
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d->fn();
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}
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#else
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static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
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{
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return NULL;
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}
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static inline void arm64_apply_bp_hardening(void) { }
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#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
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extern void arm64_memblock_init(void);
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extern void paging_init(void);
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extern void bootmem_init(void);
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extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
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extern void init_mem_pgprot(void);
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extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
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unsigned long virt, phys_addr_t size,
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pgprot_t prot, bool page_mappings_only);
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extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
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extern void mark_linear_text_alias_ro(void);
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#define INIT_MM_CONTEXT(name) \
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.pgd = init_pg_dir,
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#endif /* !__ASSEMBLY__ */
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#endif
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