1 #ifndef _ASM_EFI_H 2 #define _ASM_EFI_H 3 4 #include <asm/io.h> 5 #include <asm/mmu_context.h> 6 #include <asm/neon.h> 7 #include <asm/ptrace.h> 8 #include <asm/tlbflush.h> 9 10 #ifdef CONFIG_EFI 11 extern void efi_init(void); 12 #else 13 #define efi_init() 14 #endif 15 16 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 17 18 #define efi_set_mapping_permissions efi_create_mapping 19 20 #define arch_efi_call_virt_setup() \ 21 ({ \ 22 kernel_neon_begin(); \ 23 efi_virtmap_load(); \ 24 }) 25 26 #define arch_efi_call_virt(f, args...) \ 27 ({ \ 28 efi_##f##_t *__f; \ 29 __f = efi.systab->runtime->f; \ 30 __f(args); \ 31 }) 32 33 #define arch_efi_call_virt_teardown() \ 34 ({ \ 35 efi_virtmap_unload(); \ 36 kernel_neon_end(); \ 37 }) 38 39 #define ARCH_EFI_IRQ_FLAGS_MASK (PSR_D_BIT | PSR_A_BIT | PSR_I_BIT | PSR_F_BIT) 40 41 /* arch specific definitions used by the stub code */ 42 43 /* 44 * AArch64 requires the DTB to be 8-byte aligned in the first 512MiB from 45 * start of kernel and may not cross a 2MiB boundary. We set alignment to 46 * 2MiB so we know it won't cross a 2MiB boundary. 47 */ 48 #define EFI_FDT_ALIGN SZ_2M /* used by allocate_new_fdt_and_exit_boot() */ 49 #define MAX_FDT_OFFSET SZ_512M 50 51 #define efi_call_early(f, ...) sys_table_arg->boottime->f(__VA_ARGS__) 52 #define __efi_call_early(f, ...) f(__VA_ARGS__) 53 #define efi_is_64bit() (true) 54 55 #define alloc_screen_info(x...) &screen_info 56 #define free_screen_info(x...) 57 58 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 59 { 60 } 61 62 #define EFI_ALLOC_ALIGN SZ_64K 63 64 /* 65 * On ARM systems, virtually remapped UEFI runtime services are set up in two 66 * distinct stages: 67 * - The stub retrieves the final version of the memory map from UEFI, populates 68 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime 69 * service to communicate the new mapping to the firmware (Note that the new 70 * mapping is not live at this time) 71 * - During an early initcall(), the EFI system table is permanently remapped 72 * and the virtual remapping of the UEFI Runtime Services regions is loaded 73 * into a private set of page tables. If this all succeeds, the Runtime 74 * Services are enabled and the EFI_RUNTIME_SERVICES bit set. 75 */ 76 77 static inline void efi_set_pgd(struct mm_struct *mm) 78 { 79 switch_mm(NULL, mm, NULL); 80 } 81 82 void efi_virtmap_load(void); 83 void efi_virtmap_unload(void); 84 85 #endif /* _ASM_EFI_H */ 86