diff options
Diffstat (limited to 'arch/arm64/include/asm/efi.h')
| -rw-r--r-- | arch/arm64/include/asm/efi.h | 18 |
1 files changed, 5 insertions, 13 deletions
diff --git a/arch/arm64/include/asm/efi.h b/arch/arm64/include/asm/efi.h index 7baf2cc04e1e..ef572206f1c3 100644 --- a/arch/arm64/include/asm/efi.h +++ b/arch/arm64/include/asm/efi.h @@ -6,10 +6,8 @@ #ifdef CONFIG_EFI extern void efi_init(void); -extern void efi_virtmap_init(void); #else #define efi_init() -#define efi_virtmap_init() #endif #define efi_call_virt(f, ...) \ @@ -53,23 +51,17 @@ extern void efi_virtmap_init(void); #define EFI_ALLOC_ALIGN SZ_64K /* - * On ARM systems, virtually remapped UEFI runtime services are set up in three + * On ARM systems, virtually remapped UEFI runtime services are set up in two * distinct stages: * - The stub retrieves the final version of the memory map from UEFI, populates * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime * service to communicate the new mapping to the firmware (Note that the new * mapping is not live at this time) - * - During early boot, the page tables are allocated and populated based on the - * virt_addr fields in the memory map, but only if all descriptors with the - * EFI_MEMORY_RUNTIME attribute have a non-zero value for virt_addr. If this - * succeeds, the EFI_VIRTMAP flag is set to indicate that the virtual mappings - * have been installed successfully. - * - During an early initcall(), the UEFI Runtime Services are enabled and the - * EFI_RUNTIME_SERVICES bit set if some conditions are met, i.e., we need a - * non-early mapping of the UEFI system table, and we need to have the virtmap - * installed. + * - During an early initcall(), the EFI system table is permanently remapped + * and the virtual remapping of the UEFI Runtime Services regions is loaded + * into a private set of page tables. If this all succeeds, the Runtime + * Services are enabled and the EFI_RUNTIME_SERVICES bit set. */ -#define EFI_VIRTMAP EFI_ARCH_1 void efi_virtmap_load(void); void efi_virtmap_unload(void); |