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 *efi_ioremap(unsigned long addr, unsigned long size,
85 u32 type, u64 attribute);
87 #endif /* CONFIG_X86_32 */
89 extern int add_efi_memmap;
90 extern struct efi_scratch efi_scratch;
91 extern void efi_set_executable(efi_memory_desc_t *md, bool executable);
92 extern int efi_memblock_x86_reserve_range(void);
93 extern void efi_call_phys_prelog(void);
94 extern void efi_call_phys_epilog(void);
95 extern void efi_unmap_memmap(void);
96 extern void efi_memory_uc(u64 addr, unsigned long size);
97 extern void __init efi_map_region(efi_memory_desc_t *md);
98 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
99 extern void efi_sync_low_kernel_mappings(void);
100 extern int efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
101 extern void efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
102 extern void __init old_map_region(efi_memory_desc_t *md);
103 extern void __init runtime_code_page_mkexec(void);
104 extern void __init efi_runtime_mkexec(void);
105 extern void __init efi_dump_pagetable(void);
106 extern void __init efi_apply_memmap_quirks(void);
107 extern int __init efi_reuse_config(u64 tables, int nr_tables);
108 extern void efi_delete_dummy_variable(void);
110 struct efi_setup_data {
118 extern u64 efi_setup;
122 static inline bool efi_is_native(void)
124 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
127 static inline bool efi_runtime_supported(void)
132 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
138 extern struct console early_efi_console;
139 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
141 #ifdef CONFIG_EFI_MIXED
142 extern void efi_thunk_runtime_setup(void);
143 extern efi_status_t efi_thunk_set_virtual_address_map(
144 void *phys_set_virtual_address_map,
145 unsigned long memory_map_size,
146 unsigned long descriptor_size,
147 u32 descriptor_version,
148 efi_memory_desc_t *virtual_map);
150 static inline void efi_thunk_runtime_setup(void) {}
151 static inline efi_status_t efi_thunk_set_virtual_address_map(
152 void *phys_set_virtual_address_map,
153 unsigned long memory_map_size,
154 unsigned long descriptor_size,
155 u32 descriptor_version,
156 efi_memory_desc_t *virtual_map)
160 #endif /* CONFIG_EFI_MIXED */
162 extern bool efi_reboot_required(void);
166 * IF EFI is not configured, have the EFI calls return -ENOSYS.
168 #define efi_call0(_f) (-ENOSYS)
169 #define efi_call1(_f, _a1) (-ENOSYS)
170 #define efi_call2(_f, _a1, _a2) (-ENOSYS)
171 #define efi_call3(_f, _a1, _a2, _a3) (-ENOSYS)
172 #define efi_call4(_f, _a1, _a2, _a3, _a4) (-ENOSYS)
173 #define efi_call5(_f, _a1, _a2, _a3, _a4, _a5) (-ENOSYS)
174 #define efi_call6(_f, _a1, _a2, _a3, _a4, _a5, _a6) (-ENOSYS)
175 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
176 static inline bool efi_reboot_required(void)
180 #endif /* CONFIG_EFI */
182 #endif /* _ASM_X86_EFI_H */