4 #include <asm/fpu/api.h>
5 #include <asm/pgtable.h>
8 * We map the EFI regions needed for runtime services non-contiguously,
9 * with preserved alignment on virtual addresses starting from -4G down
10 * for a total max space of 64G. This way, we provide for stable runtime
11 * services addresses across kernels so that a kexec'd kernel can still
14 * This is the main reason why we're doing stable VA mappings for RT
17 * This flag is used in conjuction with a chicken bit called
18 * "efi=old_map" which can be used as a fallback to the old runtime
19 * services mapping method in case there's some b0rkage with a
20 * particular EFI implementation (haha, it is hard to hold up the
23 #define EFI_OLD_MEMMAP EFI_ARCH_1
25 #define EFI32_LOADER_SIGNATURE "EL32"
26 #define EFI64_LOADER_SIGNATURE "EL64"
31 extern unsigned long asmlinkage efi_call_phys(void *, ...);
34 * Wrap all the virtual calls in a way that forces the parameters on the stack.
37 /* Use this macro if your virtual returns a non-void value */
38 #define efi_call_virt(f, args...) \
42 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \
43 efi.systab->runtime->f)(args); \
48 /* Use this macro if your virtual call does not return any value */
49 #define __efi_call_virt(f, args...) \
52 ((efi_##f##_t __attribute__((regparm(0)))*) \
53 efi.systab->runtime->f)(args); \
57 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
59 #else /* !CONFIG_X86_32 */
61 #define EFI_LOADER_SIGNATURE "EL64"
63 extern u64 asmlinkage efi_call(void *fp, ...);
65 #define efi_call_phys(f, args...) efi_call((f), args)
67 #define efi_call_virt(f, ...) \
71 efi_sync_low_kernel_mappings(); \
73 __kernel_fpu_begin(); \
74 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
81 * All X86_64 virt calls return non-void values. Thus, use non-void call for
82 * virt calls that would be void on X86_32.
84 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
86 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
87 u32 type, u64 attribute);
90 * CONFIG_KASAN may redefine memset to __memset. __memset function is present
91 * only in kernel binary. Since the EFI stub linked into a separate binary it
92 * doesn't have __memset(). So we should use standard memset from
93 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
99 #endif /* CONFIG_X86_32 */
101 extern struct efi_scratch efi_scratch;
102 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
103 extern int __init efi_memblock_x86_reserve_range(void);
104 extern pgd_t * __init efi_call_phys_prolog(void);
105 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
106 extern void __init efi_unmap_memmap(void);
107 extern void __init efi_memory_uc(u64 addr, unsigned long size);
108 extern void __init efi_map_region(efi_memory_desc_t *md);
109 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
110 extern void efi_sync_low_kernel_mappings(void);
111 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
112 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
113 extern void __init old_map_region(efi_memory_desc_t *md);
114 extern void __init runtime_code_page_mkexec(void);
115 extern void __init efi_runtime_mkexec(void);
116 extern void __init efi_dump_pagetable(void);
117 extern void __init efi_apply_memmap_quirks(void);
118 extern int __init efi_reuse_config(u64 tables, int nr_tables);
119 extern void efi_delete_dummy_variable(void);
121 struct efi_setup_data {
129 extern u64 efi_setup;
133 static inline bool efi_is_native(void)
135 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
138 static inline bool efi_runtime_supported(void)
143 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
149 extern struct console early_efi_console;
150 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
152 #ifdef CONFIG_EFI_MIXED
153 extern void efi_thunk_runtime_setup(void);
154 extern efi_status_t efi_thunk_set_virtual_address_map(
155 void *phys_set_virtual_address_map,
156 unsigned long memory_map_size,
157 unsigned long descriptor_size,
158 u32 descriptor_version,
159 efi_memory_desc_t *virtual_map);
161 static inline void efi_thunk_runtime_setup(void) {}
162 static inline efi_status_t efi_thunk_set_virtual_address_map(
163 void *phys_set_virtual_address_map,
164 unsigned long memory_map_size,
165 unsigned long descriptor_size,
166 u32 descriptor_version,
167 efi_memory_desc_t *virtual_map)
171 #endif /* CONFIG_EFI_MIXED */
174 /* arch specific definitions used by the stub code */
186 u64 exit_boot_services;
188 efi_status_t (*call)(unsigned long, ...);
192 __pure const struct efi_config *__efi_early(void);
194 #define efi_call_early(f, ...) \
195 __efi_early()->call(__efi_early()->f, __VA_ARGS__);
197 extern bool efi_reboot_required(void);
200 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
201 static inline bool efi_reboot_required(void)
205 #endif /* CONFIG_EFI */
207 #endif /* _ASM_X86_EFI_H */