| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_X86_EFI_H |
| #define _ASM_X86_EFI_H |
| |
| #include <asm/fpu/api.h> |
| #include <asm/pgtable.h> |
| #include <asm/processor-flags.h> |
| #include <asm/tlb.h> |
| #include <asm/nospec-branch.h> |
| #include <asm/mmu_context.h> |
| |
| /* |
| * 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 conjunction 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" |
| |
| #define MAX_CMDLINE_ADDRESS UINT_MAX |
| |
| #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF |
| |
| #ifdef CONFIG_X86_32 |
| |
| extern asmlinkage unsigned long efi_call_phys(void *, ...); |
| |
| #define arch_efi_call_virt_setup() \ |
| ({ \ |
| kernel_fpu_begin(); \ |
| firmware_restrict_branch_speculation_start(); \ |
| }) |
| |
| #define arch_efi_call_virt_teardown() \ |
| ({ \ |
| firmware_restrict_branch_speculation_end(); \ |
| kernel_fpu_end(); \ |
| }) |
| |
| |
| /* |
| * Wrap all the virtual calls in a way that forces the parameters on the stack. |
| */ |
| #define arch_efi_call_virt(p, f, args...) \ |
| ({ \ |
| ((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \ |
| }) |
| |
| #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size) |
| |
| #else /* !CONFIG_X86_32 */ |
| |
| #define EFI_LOADER_SIGNATURE "EL64" |
| |
| extern asmlinkage u64 efi_call(void *fp, ...); |
| |
| #define efi_call_phys(f, args...) efi_call((f), args) |
| |
| /* |
| * struct efi_scratch - Scratch space used while switching to/from efi_mm |
| * @phys_stack: stack used during EFI Mixed Mode |
| * @prev_mm: store/restore stolen mm_struct while switching to/from efi_mm |
| */ |
| struct efi_scratch { |
| u64 phys_stack; |
| struct mm_struct *prev_mm; |
| } __packed; |
| |
| #define arch_efi_call_virt_setup() \ |
| ({ \ |
| efi_sync_low_kernel_mappings(); \ |
| kernel_fpu_begin(); \ |
| firmware_restrict_branch_speculation_start(); \ |
| \ |
| if (!efi_enabled(EFI_OLD_MEMMAP)) \ |
| efi_switch_mm(&efi_mm); \ |
| }) |
| |
| #define arch_efi_call_virt(p, f, args...) \ |
| efi_call((void *)p->f, args) \ |
| |
| #define arch_efi_call_virt_teardown() \ |
| ({ \ |
| if (!efi_enabled(EFI_OLD_MEMMAP)) \ |
| efi_switch_mm(efi_scratch.prev_mm); \ |
| \ |
| firmware_restrict_branch_speculation_end(); \ |
| kernel_fpu_end(); \ |
| }) |
| |
| 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_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_alloc_page_tables(void); |
| extern int __init efi_setup_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_update_mappings(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); |
| extern void efi_switch_mm(struct mm_struct *mm); |
| extern void efi_recover_from_page_fault(unsigned long phys_addr); |
| extern void efi_free_boot_services(void); |
| extern void efi_reserve_boot_services(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); |
| |
| extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt); |
| |
| #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 runtime_services; |
| u64 boot_services; |
| u64 text_output; |
| efi_status_t (*call)(unsigned long, ...); |
| bool is64; |
| } __packed; |
| |
| __pure const struct efi_config *__efi_early(void); |
| |
| static inline bool efi_is_64bit(void) |
| { |
| if (!IS_ENABLED(CONFIG_X86_64)) |
| return false; |
| |
| if (!IS_ENABLED(CONFIG_EFI_MIXED)) |
| return true; |
| |
| return __efi_early()->is64; |
| } |
| |
| #define efi_table_attr(table, attr, instance) \ |
| (efi_is_64bit() ? \ |
| ((table##_64_t *)(unsigned long)instance)->attr : \ |
| ((table##_32_t *)(unsigned long)instance)->attr) |
| |
| #define efi_call_proto(protocol, f, instance, ...) \ |
| __efi_early()->call(efi_table_attr(protocol, f, instance), \ |
| instance, ##__VA_ARGS__) |
| |
| #define efi_call_early(f, ...) \ |
| __efi_early()->call(efi_table_attr(efi_boot_services, f, \ |
| __efi_early()->boot_services), __VA_ARGS__) |
| |
| #define __efi_call_early(f, ...) \ |
| __efi_early()->call((unsigned long)f, __VA_ARGS__); |
| |
| #define efi_call_runtime(f, ...) \ |
| __efi_early()->call(efi_table_attr(efi_runtime_services, f, \ |
| __efi_early()->runtime_services), __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 */ |