arch/arm64/include/asm/mmu.h

   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