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 #define MAX_CMDLINE_ADDRESS UINT_MAX 29 30 #ifdef CONFIG_X86_32 31 32 33 extern unsigned long asmlinkage efi_call_phys(void *, ...); 34 35 /* 36 * Wrap all the virtual calls in a way that forces the parameters on the stack. 37 */ 38 39 /* Use this macro if your virtual returns a non-void value */ 40 #define efi_call_virt(f, args...) \ 41 ({ \ 42 efi_status_t __s; \ 43 kernel_fpu_begin(); \ 44 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \ 45 efi.systab->runtime->f)(args); \ 46 kernel_fpu_end(); \ 47 __s; \ 48 }) 49 50 /* Use this macro if your virtual call does not return any value */ 51 #define __efi_call_virt(f, args...) \ 52 ({ \ 53 kernel_fpu_begin(); \ 54 ((efi_##f##_t __attribute__((regparm(0)))*) \ 55 efi.systab->runtime->f)(args); \ 56 kernel_fpu_end(); \ 57 }) 58 59 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) 60 61 #else /* !CONFIG_X86_32 */ 62 63 #define EFI_LOADER_SIGNATURE "EL64" 64 65 extern u64 asmlinkage efi_call(void *fp, ...); 66 67 #define efi_call_phys(f, args...) efi_call((f), args) 68 69 #define efi_call_virt(f, ...) \ 70 ({ \ 71 efi_status_t __s; \ 72 \ 73 efi_sync_low_kernel_mappings(); \ 74 preempt_disable(); \ 75 __kernel_fpu_begin(); \ 76 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ 77 __kernel_fpu_end(); \ 78 preempt_enable(); \ 79 __s; \ 80 }) 81 82 /* 83 * All X86_64 virt calls return non-void values. Thus, use non-void call for 84 * virt calls that would be void on X86_32. 85 */ 86 #define __efi_call_virt(f, args...) efi_call_virt(f, args) 87 88 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size, 89 u32 type, u64 attribute); 90 91 #ifdef CONFIG_KASAN 92 /* 93 * CONFIG_KASAN may redefine memset to __memset. __memset function is present 94 * only in kernel binary. Since the EFI stub linked into a separate binary it 95 * doesn't have __memset(). So we should use standard memset from 96 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove. 97 */ 98 #undef memcpy 99 #undef memset 100 #undef memmove 101 #endif 102 103 #endif /* CONFIG_X86_32 */ 104 105 extern struct efi_scratch efi_scratch; 106 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable); 107 extern int __init efi_memblock_x86_reserve_range(void); 108 extern pgd_t * __init efi_call_phys_prolog(void); 109 extern void __init efi_call_phys_epilog(pgd_t *save_pgd); 110 extern void __init efi_print_memmap(void); 111 extern void __init efi_unmap_memmap(void); 112 extern void __init efi_memory_uc(u64 addr, unsigned long size); 113 extern void __init efi_map_region(efi_memory_desc_t *md); 114 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 115 extern void efi_sync_low_kernel_mappings(void); 116 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); 117 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); 118 extern void __init old_map_region(efi_memory_desc_t *md); 119 extern void __init runtime_code_page_mkexec(void); 120 extern void __init efi_runtime_mkexec(void); 121 extern void __init efi_dump_pagetable(void); 122 extern void __init efi_apply_memmap_quirks(void); 123 extern int __init efi_reuse_config(u64 tables, int nr_tables); 124 extern void efi_delete_dummy_variable(void); 125 126 struct efi_setup_data { 127 u64 fw_vendor; 128 u64 runtime; 129 u64 tables; 130 u64 smbios; 131 u64 reserved[8]; 132 }; 133 134 extern u64 efi_setup; 135 136 #ifdef CONFIG_EFI 137 138 static inline bool efi_is_native(void) 139 { 140 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 141 } 142 143 static inline bool efi_runtime_supported(void) 144 { 145 if (efi_is_native()) 146 return true; 147 148 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) 149 return true; 150 151 return false; 152 } 153 154 extern struct console early_efi_console; 155 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 156 157 #ifdef CONFIG_EFI_MIXED 158 extern void efi_thunk_runtime_setup(void); 159 extern efi_status_t efi_thunk_set_virtual_address_map( 160 void *phys_set_virtual_address_map, 161 unsigned long memory_map_size, 162 unsigned long descriptor_size, 163 u32 descriptor_version, 164 efi_memory_desc_t *virtual_map); 165 #else 166 static inline void efi_thunk_runtime_setup(void) {} 167 static inline efi_status_t efi_thunk_set_virtual_address_map( 168 void *phys_set_virtual_address_map, 169 unsigned long memory_map_size, 170 unsigned long descriptor_size, 171 u32 descriptor_version, 172 efi_memory_desc_t *virtual_map) 173 { 174 return EFI_SUCCESS; 175 } 176 #endif /* CONFIG_EFI_MIXED */ 177 178 179 /* arch specific definitions used by the stub code */ 180 181 struct efi_config { 182 u64 image_handle; 183 u64 table; 184 u64 allocate_pool; 185 u64 allocate_pages; 186 u64 get_memory_map; 187 u64 free_pool; 188 u64 free_pages; 189 u64 locate_handle; 190 u64 handle_protocol; 191 u64 exit_boot_services; 192 u64 text_output; 193 efi_status_t (*call)(unsigned long, ...); 194 bool is64; 195 } __packed; 196 197 __pure const struct efi_config *__efi_early(void); 198 199 #define efi_call_early(f, ...) \ 200 __efi_early()->call(__efi_early()->f, __VA_ARGS__); 201 202 extern bool efi_reboot_required(void); 203 204 #else 205 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 206 static inline bool efi_reboot_required(void) 207 { 208 return false; 209 } 210 #endif /* CONFIG_EFI */ 211 212 #endif /* _ASM_X86_EFI_H */ 213