1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2012 ARM Ltd.
8 #include <asm/cputype.h>
10 #define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
11 #define USER_ASID_BIT 48
12 #define USER_ASID_FLAG (UL(1) << USER_ASID_BIT)
13 #define TTBR_ASID_MASK (UL(0xffff) << 48)
15 #define BP_HARDEN_EL2_SLOTS 4
16 #define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K)
30 * This macro is only used by the TLBI and low-level switch_mm() code,
31 * neither of which can race with an ASID change. We therefore don't
32 * need to reload the counter using atomic64_read().
34 #define ASID(mm) ((mm)->context.id.counter & 0xffff)
36 static inline bool arm64_kernel_unmapped_at_el0(void)
38 return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0);
41 typedef void (*bp_hardening_cb_t)(void);
43 struct bp_hardening_data {
48 #if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \
49 defined(CONFIG_HARDEN_EL2_VECTORS))
51 extern char __bp_harden_hyp_vecs[];
52 extern atomic_t arm64_el2_vector_last_slot;
53 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */
55 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR
56 DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data);
58 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
60 return this_cpu_ptr(&bp_hardening_data);
63 static inline void arm64_apply_bp_hardening(void)
65 struct bp_hardening_data *d;
67 if (!cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR))
70 d = arm64_get_bp_hardening_data();
75 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void)
80 static inline void arm64_apply_bp_hardening(void) { }
81 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */
83 extern void arm64_memblock_init(void);
84 extern void paging_init(void);
85 extern void bootmem_init(void);
86 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
87 extern void init_mem_pgprot(void);
88 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
89 unsigned long virt, phys_addr_t size,
90 pgprot_t prot, bool page_mappings_only);
91 extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot);
92 extern void mark_linear_text_alias_ro(void);
93 extern bool kaslr_requires_kpti(void);
95 #define INIT_MM_CONTEXT(name) \
98 #endif /* !__ASSEMBLY__ */