#ifndef _ASM_X86_EFI_H #define _ASM_X86_EFI_H #include #include #include /* * We map the EFI regions needed for runtime services non-contiguously, * with preserved alignment on virtual addresses starting from -4G down * for a total max space of 64G. This way, we provide for stable runtime * services addresses across kernels so that a kexec'd kernel can still * use them. * * This is the main reason why we're doing stable VA mappings for RT * services. * * This flag is used in conjuction with a chicken bit called * "efi=old_map" which can be used as a fallback to the old runtime * services mapping method in case there's some b0rkage with a * particular EFI implementation (haha, it is hard to hold up the * sarcasm here...). */ #define EFI_OLD_MEMMAP EFI_ARCH_1 #define EFI32_LOADER_SIGNATURE "EL32" #define EFI64_LOADER_SIGNATURE "EL64" #ifdef CONFIG_X86_32 extern unsigned long asmlinkage efi_call_phys(void *, ...); /* * Wrap all the virtual calls in a way that forces the parameters on the stack. */ /* Use this macro if your virtual returns a non-void value */ #define efi_call_virt(f, args...) \ ({ \ efi_status_t __s; \ kernel_fpu_begin(); \ __s = ((efi_##f##_t __attribute__((regparm(0)))*) \ efi.systab->runtime->f)(args); \ kernel_fpu_end(); \ __s; \ }) /* Use this macro if your virtual call does not return any value */ #define __efi_call_virt(f, args...) \ ({ \ kernel_fpu_begin(); \ ((efi_##f##_t __attribute__((regparm(0)))*) \ efi.systab->runtime->f)(args); \ kernel_fpu_end(); \ }) #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) #else /* !CONFIG_X86_32 */ #define EFI_LOADER_SIGNATURE "EL64" extern u64 asmlinkage efi_call(void *fp, ...); #define efi_call_phys(f, args...) efi_call((f), args) /* * Scratch space used for switching the pagetable in the EFI stub */ struct efi_scratch { u64 r15; u64 prev_cr3; pgd_t *efi_pgt; bool use_pgd; u64 phys_stack; } __packed; #define efi_call_virt(f, ...) \ ({ \ efi_status_t __s; \ \ efi_sync_low_kernel_mappings(); \ preempt_disable(); \ __kernel_fpu_begin(); \ \ if (efi_scratch.use_pgd) { \ efi_scratch.prev_cr3 = read_cr3(); \ write_cr3((unsigned long)efi_scratch.efi_pgt); \ __flush_tlb_all(); \ } \ \ __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \ \ if (efi_scratch.use_pgd) { \ write_cr3(efi_scratch.prev_cr3); \ __flush_tlb_all(); \ } \ \ __kernel_fpu_end(); \ preempt_enable(); \ __s; \ }) /* * All X86_64 virt calls return non-void values. Thus, use non-void call for * virt calls that would be void on X86_32. */ #define __efi_call_virt(f, args...) efi_call_virt(f, args) extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size, u32 type, u64 attribute); #ifdef CONFIG_KASAN /* * CONFIG_KASAN may redefine memset to __memset. __memset function is present * only in kernel binary. Since the EFI stub linked into a separate binary it * doesn't have __memset(). So we should use standard memset from * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove. */ #undef memcpy #undef memset #undef memmove #endif #endif /* CONFIG_X86_32 */ extern struct efi_scratch efi_scratch; extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable); extern int __init efi_memblock_x86_reserve_range(void); extern pgd_t * __init efi_call_phys_prolog(void); extern void __init efi_call_phys_epilog(pgd_t *save_pgd); extern void __init efi_print_memmap(void); extern void __init efi_unmap_memmap(void); extern void __init efi_memory_uc(u64 addr, unsigned long size); extern void __init efi_map_region(efi_memory_desc_t *md); extern void __init efi_map_region_fixed(efi_memory_desc_t *md); extern void efi_sync_low_kernel_mappings(void); extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages); extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages); extern void __init old_map_region(efi_memory_desc_t *md); extern void __init runtime_code_page_mkexec(void); extern void __init efi_runtime_mkexec(void); extern void __init efi_dump_pagetable(void); extern void __init efi_apply_memmap_quirks(void); extern int __init efi_reuse_config(u64 tables, int nr_tables); extern void efi_delete_dummy_variable(void); struct efi_setup_data { u64 fw_vendor; u64 runtime; u64 tables; u64 smbios; u64 reserved[8]; }; extern u64 efi_setup; #ifdef CONFIG_EFI static inline bool efi_is_native(void) { return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT); } static inline bool efi_runtime_supported(void) { if (efi_is_native()) return true; if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP)) return true; return false; } extern struct console early_efi_console; extern void parse_efi_setup(u64 phys_addr, u32 data_len); #ifdef CONFIG_EFI_MIXED extern void efi_thunk_runtime_setup(void); extern efi_status_t efi_thunk_set_virtual_address_map( void *phys_set_virtual_address_map, unsigned long memory_map_size, unsigned long descriptor_size, u32 descriptor_version, efi_memory_desc_t *virtual_map); #else static inline void efi_thunk_runtime_setup(void) {} static inline efi_status_t efi_thunk_set_virtual_address_map( void *phys_set_virtual_address_map, unsigned long memory_map_size, unsigned long descriptor_size, u32 descriptor_version, efi_memory_desc_t *virtual_map) { return EFI_SUCCESS; } #endif /* CONFIG_EFI_MIXED */ /* arch specific definitions used by the stub code */ struct efi_config { u64 image_handle; u64 table; u64 allocate_pool; u64 allocate_pages; u64 get_memory_map; u64 free_pool; u64 free_pages; u64 locate_handle; u64 handle_protocol; u64 exit_boot_services; u64 text_output; efi_status_t (*call)(unsigned long, ...); bool is64; } __packed; __pure const struct efi_config *__efi_early(void); #define efi_call_early(f, ...) \ __efi_early()->call(__efi_early()->f, __VA_ARGS__); extern bool efi_reboot_required(void); #else static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {} static inline bool efi_reboot_required(void) { return false; } #endif /* CONFIG_EFI */ #endif /* _ASM_X86_EFI_H */