6 * We map the EFI regions needed for runtime services non-contiguously,
7 * with preserved alignment on virtual addresses starting from -4G down
8 * for a total max space of 64G. This way, we provide for stable runtime
9 * services addresses across kernels so that a kexec'd kernel can still
12 * This is the main reason why we're doing stable VA mappings for RT
15 * This flag is used in conjuction with a chicken bit called
16 * "efi=old_map" which can be used as a fallback to the old runtime
17 * services mapping method in case there's some b0rkage with a
18 * particular EFI implementation (haha, it is hard to hold up the
21 #define EFI_OLD_MEMMAP EFI_ARCH_1
23 #define EFI32_LOADER_SIGNATURE "EL32"
24 #define EFI64_LOADER_SIGNATURE "EL64"
29 extern unsigned long asmlinkage efi_call_phys(void *, ...);
32 * Wrap all the virtual calls in a way that forces the parameters on the stack.
35 /* Use this macro if your virtual returns a non-void value */
36 #define efi_call_virt(f, args...) \
40 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \
41 efi.systab->runtime->f)(args); \
46 /* Use this macro if your virtual call does not return any value */
47 #define __efi_call_virt(f, args...) \
50 ((efi_##f##_t __attribute__((regparm(0)))*) \
51 efi.systab->runtime->f)(args); \
55 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
57 #else /* !CONFIG_X86_32 */
59 #define EFI_LOADER_SIGNATURE "EL64"
61 extern u64 asmlinkage efi_call(void *fp, ...);
63 #define efi_call_phys(f, args...) efi_call((f), args)
65 #define efi_call_virt(f, ...) \
69 efi_sync_low_kernel_mappings(); \
71 __kernel_fpu_begin(); \
72 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
79 * All X86_64 virt calls return non-void values. Thus, use non-void call for
80 * virt calls that would be void on X86_32.
82 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
84 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
85 u32 type, u64 attribute);
87 #endif /* CONFIG_X86_32 */
89 extern struct efi_scratch efi_scratch;
90 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
91 extern int __init efi_memblock_x86_reserve_range(void);
92 extern void __init efi_call_phys_prolog(void);
93 extern void __init efi_call_phys_epilog(void);
94 extern void __init efi_unmap_memmap(void);
95 extern void __init efi_memory_uc(u64 addr, unsigned long size);
96 extern void __init efi_map_region(efi_memory_desc_t *md);
97 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
98 extern void efi_sync_low_kernel_mappings(void);
99 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
100 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
101 extern void __init old_map_region(efi_memory_desc_t *md);
102 extern void __init runtime_code_page_mkexec(void);
103 extern void __init efi_runtime_mkexec(void);
104 extern void __init efi_dump_pagetable(void);
105 extern void __init efi_apply_memmap_quirks(void);
106 extern int __init efi_reuse_config(u64 tables, int nr_tables);
107 extern void efi_delete_dummy_variable(void);
109 struct efi_setup_data {
117 extern u64 efi_setup;
121 static inline bool efi_is_native(void)
123 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
126 static inline bool efi_runtime_supported(void)
131 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
137 extern struct console early_efi_console;
138 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
140 #ifdef CONFIG_EFI_MIXED
141 extern void efi_thunk_runtime_setup(void);
142 extern efi_status_t efi_thunk_set_virtual_address_map(
143 void *phys_set_virtual_address_map,
144 unsigned long memory_map_size,
145 unsigned long descriptor_size,
146 u32 descriptor_version,
147 efi_memory_desc_t *virtual_map);
149 static inline void efi_thunk_runtime_setup(void) {}
150 static inline efi_status_t efi_thunk_set_virtual_address_map(
151 void *phys_set_virtual_address_map,
152 unsigned long memory_map_size,
153 unsigned long descriptor_size,
154 u32 descriptor_version,
155 efi_memory_desc_t *virtual_map)
159 #endif /* CONFIG_EFI_MIXED */
161 extern bool efi_reboot_required(void);
164 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
165 static inline bool efi_reboot_required(void)
169 #endif /* CONFIG_EFI */
171 #endif /* _ASM_X86_EFI_H */