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