1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Ltd. 4 */ 5 #ifndef __ASM_MMU_H 6 #define __ASM_MMU_H 7 8 #include <asm/cputype.h> 9 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) 14 15 #define BP_HARDEN_EL2_SLOTS 4 16 17 #ifndef __ASSEMBLY__ 18 19 typedef struct { 20 atomic64_t id; 21 void *vdso; 22 unsigned long flags; 23 } mm_context_t; 24 25 /* 26 * This macro is only used by the TLBI code, which cannot race with an 27 * ASID change and therefore doesn't need to reload the counter using 28 * atomic64_read. 29 */ 30 #define ASID(mm) ((mm)->context.id.counter & 0xffff) 31 32 static inline bool arm64_kernel_unmapped_at_el0(void) 33 { 34 return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0); 35 } 36 37 typedef void (*bp_hardening_cb_t)(void); 38 39 struct bp_hardening_data { 40 int hyp_vectors_slot; 41 bp_hardening_cb_t fn; 42 }; 43 44 #if (defined(CONFIG_HARDEN_BRANCH_PREDICTOR) || \ 45 defined(CONFIG_HARDEN_EL2_VECTORS)) 46 extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[]; 47 extern atomic_t arm64_el2_vector_last_slot; 48 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR || CONFIG_HARDEN_EL2_VECTORS */ 49 50 #ifdef CONFIG_HARDEN_BRANCH_PREDICTOR 51 DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); 52 53 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) 54 { 55 return this_cpu_ptr(&bp_hardening_data); 56 } 57 58 static inline void arm64_apply_bp_hardening(void) 59 { 60 struct bp_hardening_data *d; 61 62 if (!cpus_have_const_cap(ARM64_HARDEN_BRANCH_PREDICTOR)) 63 return; 64 65 d = arm64_get_bp_hardening_data(); 66 if (d->fn) 67 d->fn(); 68 } 69 #else 70 static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) 71 { 72 return NULL; 73 } 74 75 static inline void arm64_apply_bp_hardening(void) { } 76 #endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */ 77 78 extern void arm64_memblock_init(void); 79 extern void paging_init(void); 80 extern void bootmem_init(void); 81 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt); 82 extern void init_mem_pgprot(void); 83 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, 84 unsigned long virt, phys_addr_t size, 85 pgprot_t prot, bool page_mappings_only); 86 extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot); 87 extern void mark_linear_text_alias_ro(void); 88 extern bool kaslr_requires_kpti(void); 89 90 #define INIT_MM_CONTEXT(name) \ 91 .pgd = init_pg_dir, 92 93 #endif /* !__ASSEMBLY__ */ 94 #endif 95