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