1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <asm/fpu/api.h>
6 #include <asm/pgtable.h>
7 #include <asm/processor-flags.h>
11 * We map the EFI regions needed for runtime services non-contiguously,
12 * with preserved alignment on virtual addresses starting from -4G down
13 * for a total max space of 64G. This way, we provide for stable runtime
14 * services addresses across kernels so that a kexec'd kernel can still
17 * This is the main reason why we're doing stable VA mappings for RT
20 * This flag is used in conjuction with a chicken bit called
21 * "efi=old_map" which can be used as a fallback to the old runtime
22 * services mapping method in case there's some b0rkage with a
23 * particular EFI implementation (haha, it is hard to hold up the
26 #define EFI_OLD_MEMMAP EFI_ARCH_1
28 #define EFI32_LOADER_SIGNATURE "EL32"
29 #define EFI64_LOADER_SIGNATURE "EL64"
31 #define MAX_CMDLINE_ADDRESS UINT_MAX
33 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
37 extern asmlinkage
unsigned long efi_call_phys(void *, ...);
39 #define arch_efi_call_virt_setup() kernel_fpu_begin()
40 #define arch_efi_call_virt_teardown() kernel_fpu_end()
43 * Wrap all the virtual calls in a way that forces the parameters on the stack.
45 #define arch_efi_call_virt(p, f, args...) \
47 ((efi_##f##_t __attribute__((regparm(0)))*) p->f)(args); \
50 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
52 #else /* !CONFIG_X86_32 */
54 #define EFI_LOADER_SIGNATURE "EL64"
56 extern asmlinkage u64
efi_call(void *fp
, ...);
58 #define efi_call_phys(f, args...) efi_call((f), args)
61 * Scratch space used for switching the pagetable in the EFI stub
71 #define arch_efi_call_virt_setup() \
73 efi_sync_low_kernel_mappings(); \
75 __kernel_fpu_begin(); \
77 if (efi_scratch.use_pgd) { \
78 efi_scratch.prev_cr3 = __read_cr3(); \
79 write_cr3((unsigned long)efi_scratch.efi_pgt); \
84 #define arch_efi_call_virt(p, f, args...) \
85 efi_call((void *)p->f, args) \
87 #define arch_efi_call_virt_teardown() \
89 if (efi_scratch.use_pgd) { \
90 write_cr3(efi_scratch.prev_cr3); \
98 extern void __iomem
*__init
efi_ioremap(unsigned long addr
, unsigned long size
,
99 u32 type
, u64 attribute
);
103 * CONFIG_KASAN may redefine memset to __memset. __memset function is present
104 * only in kernel binary. Since the EFI stub linked into a separate binary it
105 * doesn't have __memset(). So we should use standard memset from
106 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
113 #endif /* CONFIG_X86_32 */
115 extern struct efi_scratch efi_scratch
;
116 extern void __init
efi_set_executable(efi_memory_desc_t
*md
, bool executable
);
117 extern int __init
efi_memblock_x86_reserve_range(void);
118 extern pgd_t
* __init
efi_call_phys_prolog(void);
119 extern void __init
efi_call_phys_epilog(pgd_t
*save_pgd
);
120 extern void __init
efi_print_memmap(void);
121 extern void __init
efi_memory_uc(u64 addr
, unsigned long size
);
122 extern void __init
efi_map_region(efi_memory_desc_t
*md
);
123 extern void __init
efi_map_region_fixed(efi_memory_desc_t
*md
);
124 extern void efi_sync_low_kernel_mappings(void);
125 extern int __init
efi_alloc_page_tables(void);
126 extern int __init
efi_setup_page_tables(unsigned long pa_memmap
, unsigned num_pages
);
127 extern void __init
old_map_region(efi_memory_desc_t
*md
);
128 extern void __init
runtime_code_page_mkexec(void);
129 extern void __init
efi_runtime_update_mappings(void);
130 extern void __init
efi_dump_pagetable(void);
131 extern void __init
efi_apply_memmap_quirks(void);
132 extern int __init
efi_reuse_config(u64 tables
, int nr_tables
);
133 extern void efi_delete_dummy_variable(void);
135 struct efi_setup_data
{
143 extern u64 efi_setup
;
147 static inline bool efi_is_native(void)
149 return IS_ENABLED(CONFIG_X86_64
) == efi_enabled(EFI_64BIT
);
152 static inline bool efi_runtime_supported(void)
157 if (IS_ENABLED(CONFIG_EFI_MIXED
) && !efi_enabled(EFI_OLD_MEMMAP
))
163 extern struct console early_efi_console
;
164 extern void parse_efi_setup(u64 phys_addr
, u32 data_len
);
166 extern void efifb_setup_from_dmi(struct screen_info
*si
, const char *opt
);
168 #ifdef CONFIG_EFI_MIXED
169 extern void efi_thunk_runtime_setup(void);
170 extern efi_status_t
efi_thunk_set_virtual_address_map(
171 void *phys_set_virtual_address_map
,
172 unsigned long memory_map_size
,
173 unsigned long descriptor_size
,
174 u32 descriptor_version
,
175 efi_memory_desc_t
*virtual_map
);
177 static inline void efi_thunk_runtime_setup(void) {}
178 static inline efi_status_t
efi_thunk_set_virtual_address_map(
179 void *phys_set_virtual_address_map
,
180 unsigned long memory_map_size
,
181 unsigned long descriptor_size
,
182 u32 descriptor_version
,
183 efi_memory_desc_t
*virtual_map
)
187 #endif /* CONFIG_EFI_MIXED */
190 /* arch specific definitions used by the stub code */
195 u64 runtime_services
;
198 efi_status_t (*call
)(unsigned long, ...);
202 __pure
const struct efi_config
*__efi_early(void);
204 static inline bool efi_is_64bit(void)
206 if (!IS_ENABLED(CONFIG_X86_64
))
209 if (!IS_ENABLED(CONFIG_EFI_MIXED
))
212 return __efi_early()->is64
;
215 #define efi_table_attr(table, attr, instance) \
217 ((table##_64_t *)(unsigned long)instance)->attr : \
218 ((table##_32_t *)(unsigned long)instance)->attr)
220 #define efi_call_proto(protocol, f, instance, ...) \
221 __efi_early()->call(efi_table_attr(protocol, f, instance), \
222 instance, ##__VA_ARGS__)
224 #define efi_call_early(f, ...) \
225 __efi_early()->call(efi_table_attr(efi_boot_services, f, \
226 __efi_early()->boot_services), __VA_ARGS__)
228 #define __efi_call_early(f, ...) \
229 __efi_early()->call((unsigned long)f, __VA_ARGS__);
231 #define efi_call_runtime(f, ...) \
232 __efi_early()->call(efi_table_attr(efi_runtime_services, f, \
233 __efi_early()->runtime_services), __VA_ARGS__)
235 extern bool efi_reboot_required(void);
238 static inline void parse_efi_setup(u64 phys_addr
, u32 data_len
) {}
239 static inline bool efi_reboot_required(void)
243 #endif /* CONFIG_EFI */
245 #endif /* _ASM_X86_EFI_H */