1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_EFI_H 3 #define _ASM_X86_EFI_H 4 5 #include <asm/fpu/api.h> 6 #include <asm/pgtable.h> 7 #include <asm/processor-flags.h> 8 #include <asm/tlb.h> 9 10 /* 11 * We map the EFI regions needed for runtime services non-contiguously, 12 * with preserved alignment on virtual addresses starting from -4G down 13 * for a total max space of 64G. This way, we provide for stable runtime 14 * services addresses across kernels so that a kexec'd kernel can still 15 * use them. 16 * 17 * This is the main reason why we're doing stable VA mappings for RT 18 * services. 19 * 20 * This flag is used in conjuction with a chicken bit called 21 * "efi=old_map" which can be used as a fallback to the old runtime 22 * services mapping method in case there's some b0rkage with a 23 * particular EFI implementation (haha, it is hard to hold up the 24 * sarcasm here...). 25 */ 26 #define EFI_OLD_MEMMAP EFI_ARCH_1 27 28 #define EFI32_LOADER_SIGNATURE "EL32" 29 #define EFI64_LOADER_SIGNATURE "EL64" 30 31 #define MAX_CMDLINE_ADDRESS UINT_MAX 32 33 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF 34 35 #ifdef CONFIG_X86_32 36 37 extern asmlinkage unsigned long efi_call_phys(void *, ...); 38 39 #define arch_efi_call_virt_setup() kernel_fpu_begin() 40 #define arch_efi_call_virt_teardown() kernel_fpu_end() 41 42 /* 43 * Wrap all the virtual calls in a way that forces the parameters on the stack. 44 */ 45 #define arch_efi_call_virt(p, f, args...) \ 46 ({ \ 47 ((efi_##f##_t __attribute__((regparm(0)))*) p->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 asmlinkage u64 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(p, f, args...) \ 85 efi_call((void *)p->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_memory_uc(u64 addr, unsigned long size); 122 extern void __init efi_map_region(efi_memory_desc_t *md); 123 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 124 extern void efi_sync_low_kernel_mappings(void); 125 extern int __init efi_alloc_page_tables(void); 126 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); 127 extern void __init old_map_region(efi_memory_desc_t *md); 128 extern void __init runtime_code_page_mkexec(void); 129 extern void __init efi_runtime_update_mappings(void); 130 extern void __init efi_dump_pagetable(void); 131 extern void __init efi_apply_memmap_quirks(void); 132 extern int __init efi_reuse_config(u64 tables, int nr_tables); 133 extern void efi_delete_dummy_variable(void); 134 135 struct efi_setup_data { 136 u64 fw_vendor; 137 u64 runtime; 138 u64 tables; 139 u64 smbios; 140 u64 reserved[8]; 141 }; 142 143 extern u64 efi_setup; 144 145 #ifdef CONFIG_EFI 146 147 static inline bool efi_is_native(void) 148 { 149 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 150 } 151 152 static inline bool efi_runtime_supported(void) 153 { 154 if (efi_is_native()) 155 return true; 156 157 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) 158 return true; 159 160 return false; 161 } 162 163 extern struct console early_efi_console; 164 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 165 166 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); 167 168 #ifdef CONFIG_EFI_MIXED 169 extern void efi_thunk_runtime_setup(void); 170 extern efi_status_t efi_thunk_set_virtual_address_map( 171 void *phys_set_virtual_address_map, 172 unsigned long memory_map_size, 173 unsigned long descriptor_size, 174 u32 descriptor_version, 175 efi_memory_desc_t *virtual_map); 176 #else 177 static inline void efi_thunk_runtime_setup(void) {} 178 static inline efi_status_t efi_thunk_set_virtual_address_map( 179 void *phys_set_virtual_address_map, 180 unsigned long memory_map_size, 181 unsigned long descriptor_size, 182 u32 descriptor_version, 183 efi_memory_desc_t *virtual_map) 184 { 185 return EFI_SUCCESS; 186 } 187 #endif /* CONFIG_EFI_MIXED */ 188 189 190 /* arch specific definitions used by the stub code */ 191 192 struct efi_config { 193 u64 image_handle; 194 u64 table; 195 u64 runtime_services; 196 u64 boot_services; 197 u64 text_output; 198 efi_status_t (*call)(unsigned long, ...); 199 bool is64; 200 } __packed; 201 202 __pure const struct efi_config *__efi_early(void); 203 204 static inline bool efi_is_64bit(void) 205 { 206 if (!IS_ENABLED(CONFIG_X86_64)) 207 return false; 208 209 if (!IS_ENABLED(CONFIG_EFI_MIXED)) 210 return true; 211 212 return __efi_early()->is64; 213 } 214 215 #define efi_table_attr(table, attr, instance) \ 216 (efi_is_64bit() ? \ 217 ((table##_64_t *)(unsigned long)instance)->attr : \ 218 ((table##_32_t *)(unsigned long)instance)->attr) 219 220 #define efi_call_proto(protocol, f, instance, ...) \ 221 __efi_early()->call(efi_table_attr(protocol, f, instance), \ 222 instance, ##__VA_ARGS__) 223 224 #define efi_call_early(f, ...) \ 225 __efi_early()->call(efi_table_attr(efi_boot_services, f, \ 226 __efi_early()->boot_services), __VA_ARGS__) 227 228 #define __efi_call_early(f, ...) \ 229 __efi_early()->call((unsigned long)f, __VA_ARGS__); 230 231 #define efi_call_runtime(f, ...) \ 232 __efi_early()->call(efi_table_attr(efi_runtime_services, f, \ 233 __efi_early()->runtime_services), __VA_ARGS__) 234 235 extern bool efi_reboot_required(void); 236 237 #else 238 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 239 static inline bool efi_reboot_required(void) 240 { 241 return false; 242 } 243 #endif /* CONFIG_EFI */ 244 245 #endif /* _ASM_X86_EFI_H */ 246