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"
28 #define MAX_CMDLINE_ADDRESS UINT_MAX
33 extern unsigned long asmlinkage efi_call_phys(void *, ...);
36 * Wrap all the virtual calls in a way that forces the parameters on the stack.
39 /* Use this macro if your virtual returns a non-void value */
40 #define efi_call_virt(f, args...) \
44 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \
45 efi.systab->runtime->f)(args); \
50 /* Use this macro if your virtual call does not return any value */
51 #define __efi_call_virt(f, args...) \
54 ((efi_##f##_t __attribute__((regparm(0)))*) \
55 efi.systab->runtime->f)(args); \
59 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
61 #else /* !CONFIG_X86_32 */
63 #define EFI_LOADER_SIGNATURE "EL64"
65 extern u64 asmlinkage efi_call(void *fp, ...);
67 #define efi_call_phys(f, args...) efi_call((f), args)
69 #define efi_call_virt(f, ...) \
73 efi_sync_low_kernel_mappings(); \
75 __kernel_fpu_begin(); \
76 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
83 * All X86_64 virt calls return non-void values. Thus, use non-void call for
84 * virt calls that would be void on X86_32.
86 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
88 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
89 u32 type, u64 attribute);
93 * CONFIG_KASAN may redefine memset to __memset. __memset function is present
94 * only in kernel binary. Since the EFI stub linked into a separate binary it
95 * doesn't have __memset(). So we should use standard memset from
96 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
103 #endif /* CONFIG_X86_32 */
105 extern struct efi_scratch efi_scratch;
106 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
107 extern int __init efi_memblock_x86_reserve_range(void);
108 extern pgd_t * __init efi_call_phys_prolog(void);
109 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
110 extern void __init efi_print_memmap(void);
111 extern void __init efi_unmap_memmap(void);
112 extern void __init efi_memory_uc(u64 addr, unsigned long size);
113 extern void __init efi_map_region(efi_memory_desc_t *md);
114 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
115 extern void efi_sync_low_kernel_mappings(void);
116 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
117 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
118 extern void __init old_map_region(efi_memory_desc_t *md);
119 extern void __init runtime_code_page_mkexec(void);
120 extern void __init efi_runtime_mkexec(void);
121 extern void __init efi_dump_pagetable(void);
122 extern void __init efi_apply_memmap_quirks(void);
123 extern int __init efi_reuse_config(u64 tables, int nr_tables);
124 extern void efi_delete_dummy_variable(void);
126 struct efi_setup_data {
134 extern u64 efi_setup;
138 static inline bool efi_is_native(void)
140 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
143 static inline bool efi_runtime_supported(void)
148 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
154 extern struct console early_efi_console;
155 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
157 #ifdef CONFIG_EFI_MIXED
158 extern void efi_thunk_runtime_setup(void);
159 extern efi_status_t efi_thunk_set_virtual_address_map(
160 void *phys_set_virtual_address_map,
161 unsigned long memory_map_size,
162 unsigned long descriptor_size,
163 u32 descriptor_version,
164 efi_memory_desc_t *virtual_map);
166 static inline void efi_thunk_runtime_setup(void) {}
167 static inline efi_status_t efi_thunk_set_virtual_address_map(
168 void *phys_set_virtual_address_map,
169 unsigned long memory_map_size,
170 unsigned long descriptor_size,
171 u32 descriptor_version,
172 efi_memory_desc_t *virtual_map)
176 #endif /* CONFIG_EFI_MIXED */
179 /* arch specific definitions used by the stub code */
191 u64 exit_boot_services;
193 efi_status_t (*call)(unsigned long, ...);
197 __pure const struct efi_config *__efi_early(void);
199 #define efi_call_early(f, ...) \
200 __efi_early()->call(__efi_early()->f, __VA_ARGS__);
202 extern bool efi_reboot_required(void);
205 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
206 static inline bool efi_reboot_required(void)
210 #endif /* CONFIG_EFI */
212 #endif /* _ASM_X86_EFI_H */