1 #ifndef _ASM_X86_EFI_H 2 #define _ASM_X86_EFI_H 3 4 #include <asm/fpu/api.h> 5 #include <asm/pgtable.h> 6 7 /* 8 * We map the EFI regions needed for runtime services non-contiguously, 9 * with preserved alignment on virtual addresses starting from -4G down 10 * for a total max space of 64G. This way, we provide for stable runtime 11 * services addresses across kernels so that a kexec'd kernel can still 12 * use them. 13 * 14 * This is the main reason why we're doing stable VA mappings for RT 15 * services. 16 * 17 * This flag is used in conjuction with a chicken bit called 18 * "efi=old_map" which can be used as a fallback to the old runtime 19 * services mapping method in case there's some b0rkage with a 20 * particular EFI implementation (haha, it is hard to hold up the 21 * sarcasm here...). 22 */ 23 #define EFI_OLD_MEMMAP EFI_ARCH_1 24 25 #define EFI32_LOADER_SIGNATURE "EL32" 26 #define EFI64_LOADER_SIGNATURE "EL64" 27 28 #ifdef CONFIG_X86_32 29 30 31 extern unsigned long asmlinkage efi_call_phys(void *, ...); 32 33 /* 34 * Wrap all the virtual calls in a way that forces the parameters on the stack. 35 */ 36 37 /* Use this macro if your virtual returns a non-void value */ 38 #define efi_call_virt(f, args...) \ 39 ({ \ 40 efi_status_t __s; \ 41 kernel_fpu_begin(); \ 42 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \ 43 efi.systab->runtime->f)(args); \ 44 kernel_fpu_end(); \ 45 __s; \ 46 }) 47 48 /* Use this macro if your virtual call does not return any value */ 49 #define __efi_call_virt(f, args...) \ 50 ({ \ 51 kernel_fpu_begin(); \ 52 ((efi_##f##_t __attribute__((regparm(0)))*) \ 53 efi.systab->runtime->f)(args); \ 54 kernel_fpu_end(); \ 55 }) 56 57 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) 58 59 #else /* !CONFIG_X86_32 */ 60 61 #define EFI_LOADER_SIGNATURE "EL64" 62 63 extern u64 asmlinkage efi_call(void *fp, ...); 64 65 #define efi_call_phys(f, args...) efi_call((f), args) 66 67 #define efi_call_virt(f, ...) \ 68 ({ \ 69 efi_status_t __s; \ 70 \ 71 efi_sync_low_kernel_mappings(); \ 72 preempt_disable(); \ 73 __kernel_fpu_begin(); \ 74 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ 75 __kernel_fpu_end(); \ 76 preempt_enable(); \ 77 __s; \ 78 }) 79 80 /* 81 * All X86_64 virt calls return non-void values. Thus, use non-void call for 82 * virt calls that would be void on X86_32. 83 */ 84 #define __efi_call_virt(f, args...) efi_call_virt(f, args) 85 86 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size, 87 u32 type, u64 attribute); 88 89 #ifdef CONFIG_KASAN 90 /* 91 * CONFIG_KASAN may redefine memset to __memset. __memset function is present 92 * only in kernel binary. Since the EFI stub linked into a separate binary it 93 * doesn't have __memset(). So we should use standard memset from 94 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove. 95 */ 96 #undef memcpy 97 #undef memset 98 #undef memmove 99 #endif 100 101 #endif /* CONFIG_X86_32 */ 102 103 extern struct efi_scratch efi_scratch; 104 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable); 105 extern int __init efi_memblock_x86_reserve_range(void); 106 extern pgd_t * __init efi_call_phys_prolog(void); 107 extern void __init efi_call_phys_epilog(pgd_t *save_pgd); 108 extern void __init efi_print_memmap(void); 109 extern void __init efi_unmap_memmap(void); 110 extern void __init efi_memory_uc(u64 addr, unsigned long size); 111 extern void __init efi_map_region(efi_memory_desc_t *md); 112 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 113 extern void efi_sync_low_kernel_mappings(void); 114 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); 115 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); 116 extern void __init old_map_region(efi_memory_desc_t *md); 117 extern void __init runtime_code_page_mkexec(void); 118 extern void __init efi_runtime_mkexec(void); 119 extern void __init efi_dump_pagetable(void); 120 extern void __init efi_apply_memmap_quirks(void); 121 extern int __init efi_reuse_config(u64 tables, int nr_tables); 122 extern void efi_delete_dummy_variable(void); 123 124 struct efi_setup_data { 125 u64 fw_vendor; 126 u64 runtime; 127 u64 tables; 128 u64 smbios; 129 u64 reserved[8]; 130 }; 131 132 extern u64 efi_setup; 133 134 #ifdef CONFIG_EFI 135 136 static inline bool efi_is_native(void) 137 { 138 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 139 } 140 141 static inline bool efi_runtime_supported(void) 142 { 143 if (efi_is_native()) 144 return true; 145 146 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) 147 return true; 148 149 return false; 150 } 151 152 extern struct console early_efi_console; 153 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 154 155 #ifdef CONFIG_EFI_MIXED 156 extern void efi_thunk_runtime_setup(void); 157 extern efi_status_t efi_thunk_set_virtual_address_map( 158 void *phys_set_virtual_address_map, 159 unsigned long memory_map_size, 160 unsigned long descriptor_size, 161 u32 descriptor_version, 162 efi_memory_desc_t *virtual_map); 163 #else 164 static inline void efi_thunk_runtime_setup(void) {} 165 static inline efi_status_t efi_thunk_set_virtual_address_map( 166 void *phys_set_virtual_address_map, 167 unsigned long memory_map_size, 168 unsigned long descriptor_size, 169 u32 descriptor_version, 170 efi_memory_desc_t *virtual_map) 171 { 172 return EFI_SUCCESS; 173 } 174 #endif /* CONFIG_EFI_MIXED */ 175 176 177 /* arch specific definitions used by the stub code */ 178 179 struct efi_config { 180 u64 image_handle; 181 u64 table; 182 u64 allocate_pool; 183 u64 allocate_pages; 184 u64 get_memory_map; 185 u64 free_pool; 186 u64 free_pages; 187 u64 locate_handle; 188 u64 handle_protocol; 189 u64 exit_boot_services; 190 u64 text_output; 191 efi_status_t (*call)(unsigned long, ...); 192 bool is64; 193 } __packed; 194 195 __pure const struct efi_config *__efi_early(void); 196 197 #define efi_call_early(f, ...) \ 198 __efi_early()->call(__efi_early()->f, __VA_ARGS__); 199 200 extern bool efi_reboot_required(void); 201 202 #else 203 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 204 static inline bool efi_reboot_required(void) 205 { 206 return false; 207 } 208 #endif /* CONFIG_EFI */ 209 210 #endif /* _ASM_X86_EFI_H */ 211