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arm64: mm: Add arm64_kernel_unmapped_at_el0 helper
In order for code such as TLB invalidation to operate efficiently when the decision to map the kernel at EL0 is determined at runtime, this patch introduces a helper function, arm64_kernel_unmapped_at_el0, to determine whether or not the kernel is mapped whilst running in userspace. Currently, this just reports the value of CONFIG_UNMAP_KERNEL_AT_EL0, but will later be hooked up to a fake CPU capability using a static key. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Laura Abbott <labbott@redhat.com> Tested-by: Shanker Donthineni <shankerd@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -19,6 +19,8 @@
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#define MMCF_AARCH32 0x1 /* mm context flag for AArch32 executables */
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#define USER_ASID_FLAG (UL(1) << 48)
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#ifndef __ASSEMBLY__
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typedef struct {
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atomic64_t id;
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void *vdso;
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@ -32,6 +34,11 @@ typedef struct {
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*/
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#define ASID(mm) ((mm)->context.id.counter & 0xffff)
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static inline bool arm64_kernel_unmapped_at_el0(void)
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{
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return IS_ENABLED(CONFIG_UNMAP_KERNEL_AT_EL0);
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}
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extern void paging_init(void);
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extern void bootmem_init(void);
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extern void __iomem *early_io_map(phys_addr_t phys, unsigned long virt);
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@ -42,4 +49,5 @@ extern void create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
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extern void *fixmap_remap_fdt(phys_addr_t dt_phys);
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extern void mark_linear_text_alias_ro(void);
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#endif /* !__ASSEMBLY__ */
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#endif
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