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 #include <asm/nospec-branch.h> 10 11 /* 12 * We map the EFI regions needed for runtime services non-contiguously, 13 * with preserved alignment on virtual addresses starting from -4G down 14 * for a total max space of 64G. This way, we provide for stable runtime 15 * services addresses across kernels so that a kexec'd kernel can still 16 * use them. 17 * 18 * This is the main reason why we're doing stable VA mappings for RT 19 * services. 20 * 21 * This flag is used in conjuction with a chicken bit called 22 * "efi=old_map" which can be used as a fallback to the old runtime 23 * services mapping method in case there's some b0rkage with a 24 * particular EFI implementation (haha, it is hard to hold up the 25 * sarcasm here...). 26 */ 27 #define EFI_OLD_MEMMAP EFI_ARCH_1 28 29 #define EFI32_LOADER_SIGNATURE "EL32" 30 #define EFI64_LOADER_SIGNATURE "EL64" 31 32 #define MAX_CMDLINE_ADDRESS UINT_MAX 33 34 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF 35 36 #ifdef CONFIG_X86_32 37 38 extern asmlinkage unsigned long efi_call_phys(void *, ...); 39 40 #define arch_efi_call_virt_setup() \ 41 ({ \ 42 kernel_fpu_begin(); \ 43 firmware_restrict_branch_speculation_start(); \ 44 }) 45 46 #define arch_efi_call_virt_teardown() \ 47 ({ \ 48 firmware_restrict_branch_speculation_end(); \ 49 kernel_fpu_end(); \ 50 }) 51 52 53 /* 54 * Wrap all the virtual calls in a way that forces the parameters on the stack. 55 */ 56 #define arch_efi_call_virt(p, f, args...) \ 57 ({ \ 58 ((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \ 59 }) 60 61 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) 62 63 #else /* !CONFIG_X86_32 */ 64 65 #define EFI_LOADER_SIGNATURE "EL64" 66 67 extern asmlinkage u64 efi_call(void *fp, ...); 68 69 #define efi_call_phys(f, args...) efi_call((f), args) 70 71 /* 72 * Scratch space used for switching the pagetable in the EFI stub 73 */ 74 struct efi_scratch { 75 u64 r15; 76 u64 prev_cr3; 77 pgd_t *efi_pgt; 78 bool use_pgd; 79 u64 phys_stack; 80 } __packed; 81 82 #define arch_efi_call_virt_setup() \ 83 ({ \ 84 efi_sync_low_kernel_mappings(); \ 85 preempt_disable(); \ 86 __kernel_fpu_begin(); \ 87 firmware_restrict_branch_speculation_start(); \ 88 \ 89 if (efi_scratch.use_pgd) { \ 90 efi_scratch.prev_cr3 = __read_cr3(); \ 91 write_cr3((unsigned long)efi_scratch.efi_pgt); \ 92 __flush_tlb_all(); \ 93 } \ 94 }) 95 96 #define arch_efi_call_virt(p, f, args...) \ 97 efi_call((void *)p->f, args) \ 98 99 #define arch_efi_call_virt_teardown() \ 100 ({ \ 101 if (efi_scratch.use_pgd) { \ 102 write_cr3(efi_scratch.prev_cr3); \ 103 __flush_tlb_all(); \ 104 } \ 105 \ 106 firmware_restrict_branch_speculation_end(); \ 107 __kernel_fpu_end(); \ 108 preempt_enable(); \ 109 }) 110 111 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size, 112 u32 type, u64 attribute); 113 114 #ifdef CONFIG_KASAN 115 /* 116 * CONFIG_KASAN may redefine memset to __memset. __memset function is present 117 * only in kernel binary. Since the EFI stub linked into a separate binary it 118 * doesn't have __memset(). So we should use standard memset from 119 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove. 120 */ 121 #undef memcpy 122 #undef memset 123 #undef memmove 124 #endif 125 126 #endif /* CONFIG_X86_32 */ 127 128 extern struct efi_scratch efi_scratch; 129 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable); 130 extern int __init efi_memblock_x86_reserve_range(void); 131 extern pgd_t * __init efi_call_phys_prolog(void); 132 extern void __init efi_call_phys_epilog(pgd_t *save_pgd); 133 extern void __init efi_print_memmap(void); 134 extern void __init efi_memory_uc(u64 addr, unsigned long size); 135 extern void __init efi_map_region(efi_memory_desc_t *md); 136 extern void __init efi_map_region_fixed(efi_memory_desc_t *md); 137 extern void efi_sync_low_kernel_mappings(void); 138 extern int __init efi_alloc_page_tables(void); 139 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); 140 extern void __init old_map_region(efi_memory_desc_t *md); 141 extern void __init runtime_code_page_mkexec(void); 142 extern void __init efi_runtime_update_mappings(void); 143 extern void __init efi_dump_pagetable(void); 144 extern void __init efi_apply_memmap_quirks(void); 145 extern int __init efi_reuse_config(u64 tables, int nr_tables); 146 extern void efi_delete_dummy_variable(void); 147 148 struct efi_setup_data { 149 u64 fw_vendor; 150 u64 runtime; 151 u64 tables; 152 u64 smbios; 153 u64 reserved[8]; 154 }; 155 156 extern u64 efi_setup; 157 158 #ifdef CONFIG_EFI 159 160 static inline bool efi_is_native(void) 161 { 162 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); 163 } 164 165 static inline bool efi_runtime_supported(void) 166 { 167 if (efi_is_native()) 168 return true; 169 170 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) 171 return true; 172 173 return false; 174 } 175 176 extern struct console early_efi_console; 177 extern void parse_efi_setup(u64 phys_addr, u32 data_len); 178 179 extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); 180 181 #ifdef CONFIG_EFI_MIXED 182 extern void efi_thunk_runtime_setup(void); 183 extern efi_status_t efi_thunk_set_virtual_address_map( 184 void *phys_set_virtual_address_map, 185 unsigned long memory_map_size, 186 unsigned long descriptor_size, 187 u32 descriptor_version, 188 efi_memory_desc_t *virtual_map); 189 #else 190 static inline void efi_thunk_runtime_setup(void) {} 191 static inline efi_status_t efi_thunk_set_virtual_address_map( 192 void *phys_set_virtual_address_map, 193 unsigned long memory_map_size, 194 unsigned long descriptor_size, 195 u32 descriptor_version, 196 efi_memory_desc_t *virtual_map) 197 { 198 return EFI_SUCCESS; 199 } 200 #endif /* CONFIG_EFI_MIXED */ 201 202 203 /* arch specific definitions used by the stub code */ 204 205 struct efi_config { 206 u64 image_handle; 207 u64 table; 208 u64 runtime_services; 209 u64 boot_services; 210 u64 text_output; 211 efi_status_t (*call)(unsigned long, ...); 212 bool is64; 213 } __packed; 214 215 __pure const struct efi_config *__efi_early(void); 216 217 static inline bool efi_is_64bit(void) 218 { 219 if (!IS_ENABLED(CONFIG_X86_64)) 220 return false; 221 222 if (!IS_ENABLED(CONFIG_EFI_MIXED)) 223 return true; 224 225 return __efi_early()->is64; 226 } 227 228 #define efi_table_attr(table, attr, instance) \ 229 (efi_is_64bit() ? \ 230 ((table##_64_t *)(unsigned long)instance)->attr : \ 231 ((table##_32_t *)(unsigned long)instance)->attr) 232 233 #define efi_call_proto(protocol, f, instance, ...) \ 234 __efi_early()->call(efi_table_attr(protocol, f, instance), \ 235 instance, ##__VA_ARGS__) 236 237 #define efi_call_early(f, ...) \ 238 __efi_early()->call(efi_table_attr(efi_boot_services, f, \ 239 __efi_early()->boot_services), __VA_ARGS__) 240 241 #define __efi_call_early(f, ...) \ 242 __efi_early()->call((unsigned long)f, __VA_ARGS__); 243 244 #define efi_call_runtime(f, ...) \ 245 __efi_early()->call(efi_table_attr(efi_runtime_services, f, \ 246 __efi_early()->runtime_services), __VA_ARGS__) 247 248 extern bool efi_reboot_required(void); 249 250 #else 251 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} 252 static inline bool efi_reboot_required(void) 253 { 254 return false; 255 } 256 #endif /* CONFIG_EFI */ 257 258 #endif /* _ASM_X86_EFI_H */ 259