1 #ifndef _ASM_EFI_H 2 #define _ASM_EFI_H 3 4 #include <asm/cpufeature.h> 5 #include <asm/io.h> 6 #include <asm/mmu_context.h> 7 #include <asm/neon.h> 8 #include <asm/ptrace.h> 9 #include <asm/tlbflush.h> 10 11 #ifdef CONFIG_EFI 12 extern void efi_init(void); 13 #else 14 #define efi_init() 15 #endif 16 17 int efi_create_mapping(struct mm_struct *mm, efi_memory_desc_t *md); 18 int efi_set_mapping_permissions(struct mm_struct *mm, efi_memory_desc_t *md); 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(p, f, args...) \ 27 ({ \ 28 efi_##f##_t *__f; \ 29 __f = p->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_call_runtime(f, ...) sys_table_arg->runtime->f(__VA_ARGS__) 54 #define efi_is_64bit() (true) 55 56 #define efi_call_proto(protocol, f, instance, ...) \ 57 ((protocol##_t *)instance)->f(instance, ##__VA_ARGS__) 58 59 #define alloc_screen_info(x...) &screen_info 60 #define free_screen_info(x...) 61 62 static inline void efifb_setup_from_dmi(struct screen_info *si, const char *opt) 63 { 64 } 65 66 #define EFI_ALLOC_ALIGN SZ_64K 67 68 /* 69 * On ARM systems, virtually remapped UEFI runtime services are set up in two 70 * distinct stages: 71 * - The stub retrieves the final version of the memory map from UEFI, populates 72 * the virt_addr fields and calls the SetVirtualAddressMap() [SVAM] runtime 73 * service to communicate the new mapping to the firmware (Note that the new 74 * mapping is not live at this time) 75 * - During an early initcall(), the EFI system table is permanently remapped 76 * and the virtual remapping of the UEFI Runtime Services regions is loaded 77 * into a private set of page tables. If this all succeeds, the Runtime 78 * Services are enabled and the EFI_RUNTIME_SERVICES bit set. 79 */ 80 81 static inline void efi_set_pgd(struct mm_struct *mm) 82 { 83 __switch_mm(mm); 84 85 if (system_uses_ttbr0_pan()) { 86 if (mm != current->active_mm) { 87 /* 88 * Update the current thread's saved ttbr0 since it is 89 * restored as part of a return from exception. Set 90 * the hardware TTBR0_EL1 using cpu_switch_mm() 91 * directly to enable potential errata workarounds. 92 */ 93 update_saved_ttbr0(current, mm); 94 cpu_switch_mm(mm->pgd, mm); 95 } else { 96 /* 97 * Defer the switch to the current thread's TTBR0_EL1 98 * until uaccess_enable(). Restore the current 99 * thread's saved ttbr0 corresponding to its active_mm 100 * (if different from init_mm). 101 */ 102 cpu_set_reserved_ttbr0(); 103 if (current->active_mm != &init_mm) 104 update_saved_ttbr0(current, current->active_mm); 105 } 106 } 107 } 108 109 void efi_virtmap_load(void); 110 void efi_virtmap_unload(void); 111 112 #endif /* _ASM_EFI_H */ 113