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 #define __BP_HARDEN_HYP_VECS_SZ (BP_HARDEN_EL2_SLOTS * SZ_2K) 17 18 #ifndef __ASSEMBLY__ 19 20 #include <linux/refcount.h> 21 22 typedef struct { 23 atomic64_t id; 24 #ifdef CONFIG_COMPAT 25 void *sigpage; 26 #endif 27 refcount_t pinned; 28 void *vdso; 29 unsigned long flags; 30 } mm_context_t; 31 32 /* 33 * This macro is only used by the TLBI and low-level switch_mm() code, 34 * neither of which can race with an ASID change. We therefore don't 35 * need to reload the counter using atomic64_read(). 36 */ 37 #define ASID(mm) ((mm)->context.id.counter & 0xffff) 38 39 static inline bool arm64_kernel_unmapped_at_el0(void) 40 { 41 return cpus_have_const_cap(ARM64_UNMAP_KERNEL_AT_EL0); 42 } 43 44 typedef void (*bp_hardening_cb_t)(void); 45 46 struct bp_hardening_data { 47 int hyp_vectors_slot; 48 bp_hardening_cb_t fn; 49 }; 50 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_SPECTRE_V2)) 63 return; 64 65 d = arm64_get_bp_hardening_data(); 66 if (d->fn) 67 d->fn(); 68 } 69 70 extern void arm64_memblock_init(void); 71 extern void paging_init(void); 72 extern void bootmem_init(void); 73 extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt); 74 extern void init_mem_pgprot(void); 75 extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, 76 unsigned long virt, phys_addr_t size, 77 pgprot_t prot, bool page_mappings_only); 78 extern void *fixmap_remap_fdt(phys_addr_t dt_phys, int *size, pgprot_t prot); 79 extern void mark_linear_text_alias_ro(void); 80 extern bool kaslr_requires_kpti(void); 81 82 #define INIT_MM_CONTEXT(name) \ 83 .pgd = init_pg_dir, 84 85 #endif /* !__ASSEMBLY__ */ 86 #endif 87