diff options
Diffstat (limited to 'arch/arm64/include/asm/mmu.h')
| -rw-r--r-- | arch/arm64/include/asm/mmu.h | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mmu.h b/arch/arm64/include/asm/mmu.h index 8d9fce037b2f..d51158a61892 100644 --- a/arch/arm64/include/asm/mmu.h +++ b/arch/arm64/include/asm/mmu.h @@ -16,6 +16,12 @@ #ifndef __ASM_MMU_H #define __ASM_MMU_H +#define USER_ASID_FLAG (UL(1) << 48) + +#ifndef __ASSEMBLY__ + +#include <linux/percpu.h> + typedef struct { atomic64_t id; void *vdso; @@ -28,6 +34,49 @@ typedef struct { */ #define ASID(mm) ((mm)->context.id.counter & 0xffff) +static inline bool arm64_kernel_unmapped_at_el0(void) +{ + return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0) && + cpus_have_cap(ARM64_UNMAP_KERNEL_AT_EL0); +} + +typedef void (*bp_hardening_cb_t)(void); + +struct bp_hardening_data { + int hyp_vectors_slot; + bp_hardening_cb_t fn; +}; + +#ifdef CONFIG_HARDEN_BRANCH_PREDICTOR +extern char __bp_harden_hyp_vecs_start[], __bp_harden_hyp_vecs_end[]; + +DECLARE_PER_CPU_READ_MOSTLY(struct bp_hardening_data, bp_hardening_data); + +static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) +{ + return this_cpu_ptr(&bp_hardening_data); +} + +static inline void arm64_apply_bp_hardening(void) +{ + struct bp_hardening_data *d; + + if (!cpus_have_cap(ARM64_HARDEN_BRANCH_PREDICTOR)) + return; + + d = arm64_get_bp_hardening_data(); + if (d->fn) + d->fn(); +} +#else +static inline struct bp_hardening_data *arm64_get_bp_hardening_data(void) +{ + return NULL; +} + +static inline void arm64_apply_bp_hardening(void) { } +#endif /* CONFIG_HARDEN_BRANCH_PREDICTOR */ + extern void paging_init(void); extern void bootmem_init(void); extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt); @@ -37,4 +86,5 @@ extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys, pgprot_t prot, bool allow_block_mappings); extern void *fixmap_remap_fdt(phys_addr_t dt_phys); +#endif /* !__ASSEMBLY__ */ #endif |