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 #include <asm/processor-flags.h> 7 #include <asm/tlb.h> 8 9 /* 10 * We map the EFI regions needed for runtime services non-contiguously, 11 * with preserved alignment on virtual addresses starting from -4G down 12 * for a total max space of 64G. This way, we provide for stable runtime 13 * services addresses across kernels so that a kexec'd kernel can still 14 * use them. 15 * 16 * This is the main reason why we're doing stable VA mappings for RT 17 * services. 18 * 19 * This flag is used in conjuction with a chicken bit called 20 * "efi=old_map" which can be used as a fallback to the old runtime 21 * services mapping method in case there's some b0rkage with a 22 * particular EFI implementation (haha, it is hard to hold up the 23 * sarcasm here...). 24 */ 25 #define EFI_OLD_MEMMAP EFI_ARCH_1 26 27 #define EFI32_LOADER_SIGNATURE "EL32" 28 #define EFI64_LOADER_SIGNATURE "EL64" 29 30 #define MAX_CMDLINE_ADDRESS UINT_MAX 31 32 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF 33 34 #ifdef CONFIG_X86_32 35 36 extern unsigned long asmlinkage efi_call_phys(void *, ...); 37 38 #define arch_efi_call_virt_setup() kernel_fpu_begin() 39 #define arch_efi_call_virt_teardown() kernel_fpu_end() 40 41 /* 42 * Wrap all the virtual calls in a way that forces the parameters on the stack. 43 */ 44 #define arch_efi_call_virt(f, args...) \ 45 ({ \ 46 ((efi_##f##_t __attribute__((regparm(0)))*) \ 47 efi.systab->runtime->f)(args); \ 48 }) 49 50 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) 51 52 #else /* !CONFIG_X86_32 */ 53 54 #define EFI_LOADER_SIGNATURE "EL64" 55 56 extern u64 asmlinkage efi_call(void *fp, ...); 57 58 #define efi_call_phys(f, args...) efi_call((f), args) 59 60 /* 61 * Scratch space used for switching the pagetable in the EFI stub 62 */ 63 struct efi_scratch { 64 u64 r15; 65 u64 prev_cr3; 66 pgd_t *efi_pgt; 67 bool use_pgd; 68 u64 phys_stack; 69 } __packed; 70 71 #define arch_efi_call_virt_setup() \ 72 ({ \ 73 efi_sync_low_kernel_mappings(); \ 74 preempt_disable(); \ 75 __kernel_fpu_begin(); \ 76 \ 77 if (efi_scratch.use_pgd) { \ 78 efi_scratch.prev_cr3 = read_cr3(); \ 79 write_cr3((unsigned long)efi_scratch.efi_pgt); \ 80 __flush_tlb_all(); \ 81 } \ 82 }) 83 84 #define arch_efi_call_virt(f, args...) \ 85 efi_call((void *)efi.systab->runtime->f, args) \ 86 87 #define arch_efi_call_virt_teardown() \ 88 ({ \ 89 if (efi_scratch.use_pgd) { \ 90 write_cr3(efi_scratch.prev_cr3); \ 91 __flush_tlb_all(); \ 92 } \ 93 \ 94 __kernel_fpu_end(); \ 95 preempt_enable(); \ 96 }) 97 98 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size, 99 u32 type, u64 attribute); 100 101 #ifdef CONFIG_KASAN 102 /* 103 * CONFIG_KASAN may redefine memset to __memset. __memset function is present 104 * only in kernel binary. Since the EFI stub linked into a separate binary it 105 * doesn't have __memset(). So we should use standard memset from 106 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove. 107 */ 108 #undef memcpy 109 #undef memset 110 #undef memmove 111 #endif 112 113 #endif /* CONFIG_X86_32 */ 114 115 extern struct efi_scratch efi_scratch; 116 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable); 117 extern int __init efi_memblock_x86_reserve_range(void); 118 extern pgd_t * __init efi_call_phys_prolog(void); 119 extern void __init efi_call_phys_epilog(pgd_t *save_pgd); 120 extern void __init efi_print_memmap(void); 121 extern void __init efi_unmap_memmap(void); 122 extern void __init efi_memory_uc(u64 addr, unsigned long size); 123 extern void __init efi_map_region(efi_memory_desc_t *md); 124 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 125 extern void efi_sync_low_kernel_mappings(void); 126 extern int __init efi_alloc_page_tables(void); 127 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); 128 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); 129 extern void __init old_map_region(efi_memory_desc_t *md); 130 extern void __init runtime_code_page_mkexec(void); 131 extern void __init efi_runtime_update_mappings(void); 132 extern void __init efi_dump_pagetable(void); 133 extern void __init efi_apply_memmap_quirks(void); 134 extern int __init efi_reuse_config(u64 tables, int nr_tables); 135 extern void efi_delete_dummy_variable(void); 136 137 struct efi_setup_data { 138 u64 fw_vendor; 139 u64 runtime; 140 u64 tables; 141 u64 smbios; 142 u64 reserved[8]; 143 }; 144 145 extern u64 efi_setup; 146 147 #ifdef CONFIG_EFI 148 149 static inline bool efi_is_native(void) 150 { 151 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 152 } 153 154 static inline bool efi_runtime_supported(void) 155 { 156 if (efi_is_native()) 157 return true; 158 159 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) 160 return true; 161 162 return false; 163 } 164 165 extern struct console early_efi_console; 166 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 167 168 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); 169 170 #ifdef CONFIG_EFI_MIXED 171 extern void efi_thunk_runtime_setup(void); 172 extern efi_status_t efi_thunk_set_virtual_address_map( 173 void *phys_set_virtual_address_map, 174 unsigned long memory_map_size, 175 unsigned long descriptor_size, 176 u32 descriptor_version, 177 efi_memory_desc_t *virtual_map); 178 #else 179 static inline void efi_thunk_runtime_setup(void) {} 180 static inline efi_status_t efi_thunk_set_virtual_address_map( 181 void *phys_set_virtual_address_map, 182 unsigned long memory_map_size, 183 unsigned long descriptor_size, 184 u32 descriptor_version, 185 efi_memory_desc_t *virtual_map) 186 { 187 return EFI_SUCCESS; 188 } 189 #endif /* CONFIG_EFI_MIXED */ 190 191 192 /* arch specific definitions used by the stub code */ 193 194 struct efi_config { 195 u64 image_handle; 196 u64 table; 197 u64 allocate_pool; 198 u64 allocate_pages; 199 u64 get_memory_map; 200 u64 free_pool; 201 u64 free_pages; 202 u64 locate_handle; 203 u64 handle_protocol; 204 u64 exit_boot_services; 205 u64 text_output; 206 efi_status_t (*call)(unsigned long, ...); 207 bool is64; 208 } __packed; 209 210 __pure const struct efi_config *__efi_early(void); 211 212 #define efi_call_early(f, ...) \ 213 __efi_early()->call(__efi_early()->f, __VA_ARGS__); 214 215 #define __efi_call_early(f, ...) \ 216 __efi_early()->call((unsigned long)f, __VA_ARGS__); 217 218 #define efi_is_64bit() __efi_early()->is64 219 220 extern bool efi_reboot_required(void); 221 222 #else 223 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 224 static inline bool efi_reboot_required(void) 225 { 226 return false; 227 } 228 #endif /* CONFIG_EFI */ 229 230 #endif /* _ASM_X86_EFI_H */ 231