1 #ifndef _ASM_X86_EFI_H
2 #define _ASM_X86_EFI_H
3
4 #include <asm/fpu/api.h>
5 #include <asm/pgtable.h>
6 #include <asm/nospec-branch.h>
7
8 /*
9 * We map the EFI regions needed for runtime services non-contiguously,
10 * with preserved alignment on virtual addresses starting from -4G down
11 * for a total max space of 64G. This way, we provide for stable runtime
12 * services addresses across kernels so that a kexec'd kernel can still
13 * use them.
14 *
15 * This is the main reason why we're doing stable VA mappings for RT
16 * services.
17 *
18 * This flag is used in conjuction with a chicken bit called
19 * "efi=old_map" which can be used as a fallback to the old runtime
20 * services mapping method in case there's some b0rkage with a
21 * particular EFI implementation (haha, it is hard to hold up the
22 * sarcasm here...).
23 */
24 #define EFI_OLD_MEMMAP EFI_ARCH_1
25
26 #define EFI32_LOADER_SIGNATURE "EL32"
27 #define EFI64_LOADER_SIGNATURE "EL64"
28
29 #define MAX_CMDLINE_ADDRESS UINT_MAX
30
31 #ifdef CONFIG_X86_32
32
33
34 extern unsigned long asmlinkage efi_call_phys(void *, ...);
35
36 /*
37 * Wrap all the virtual calls in a way that forces the parameters on the stack.
38 */
39
40 /* Use this macro if your virtual returns a non-void value */
41 #define efi_call_virt(f, args...) \
42 ({ \
43 efi_status_t __s; \
44 kernel_fpu_begin(); \
45 firmware_restrict_branch_speculation_start(); \
46 __s = ((efi_##f##_t __attribute__((regparm(0)))*) \
47 efi.systab->runtime->f)(args); \
48 firmware_restrict_branch_speculation_end(); \
49 kernel_fpu_end(); \
50 __s; \
51 })
52
53 /* Use this macro if your virtual call does not return any value */
54 #define __efi_call_virt(f, args...) \
55 ({ \
56 kernel_fpu_begin(); \
57 firmware_restrict_branch_speculation_start(); \
58 ((efi_##f##_t __attribute__((regparm(0)))*) \
59 efi.systab->runtime->f)(args); \
60 firmware_restrict_branch_speculation_end(); \
61 kernel_fpu_end(); \
62 })
63
64 #define efi_ioremap(addr, size, type, attr) ioremap_cache(addr, size)
65
66 #else /* !CONFIG_X86_32 */
67
68 #define EFI_LOADER_SIGNATURE "EL64"
69
70 extern u64 asmlinkage efi_call(void *fp, ...);
71
72 #define efi_call_phys(f, args...) efi_call((f), args)
73
74 #define efi_call_virt(f, ...) \
75 ({ \
76 efi_status_t __s; \
77 \
78 efi_sync_low_kernel_mappings(); \
79 preempt_disable(); \
80 __kernel_fpu_begin(); \
81 firmware_restrict_branch_speculation_start(); \
82 __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__); \
83 firmware_restrict_branch_speculation_end(); \
84 __kernel_fpu_end(); \
85 preempt_enable(); \
86 __s; \
87 })
88
89 /*
90 * All X86_64 virt calls return non-void values. Thus, use non-void call for
91 * virt calls that would be void on X86_32.
92 */
93 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
94
95 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
96 u32 type, u64 attribute);
97
98 #ifdef CONFIG_KASAN
99 /*
100 * CONFIG_KASAN may redefine memset to __memset. __memset function is present
101 * only in kernel binary. Since the EFI stub linked into a separate binary it
102 * doesn't have __memset(). So we should use standard memset from
103 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
104 */
105 #undef memcpy
106 #undef memset
107 #undef memmove
108 #endif
109
110 #endif /* CONFIG_X86_32 */
111
112 extern struct efi_scratch efi_scratch;
113 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
114 extern int __init efi_memblock_x86_reserve_range(void);
115 extern pgd_t * __init efi_call_phys_prolog(void);
116 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
117 extern void __init efi_print_memmap(void);
118 extern void __init efi_unmap_memmap(void);
119 extern void __init efi_memory_uc(u64 addr, unsigned long size);
120 extern void __init efi_map_region(efi_memory_desc_t *md);
121 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
122 extern void efi_sync_low_kernel_mappings(void);
123 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
124 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
125 extern void __init old_map_region(efi_memory_desc_t *md);
126 extern void __init runtime_code_page_mkexec(void);
127 extern void __init efi_runtime_mkexec(void);
128 extern void __init efi_dump_pagetable(void);
129 extern void __init efi_apply_memmap_quirks(void);
130 extern int __init efi_reuse_config(u64 tables, int nr_tables);
131 extern void efi_delete_dummy_variable(void);
132
133 struct efi_setup_data {
134 u64 fw_vendor;
135 u64 runtime;
136 u64 tables;
137 u64 smbios;
138 u64 reserved[8];
139 };
140
141 extern u64 efi_setup;
142
143 #ifdef CONFIG_EFI
144
efi_is_native(void)145 static inline bool efi_is_native(void)
146 {
147 return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
148 }
149
efi_runtime_supported(void)150 static inline bool efi_runtime_supported(void)
151 {
152 if (efi_is_native())
153 return true;
154
155 if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
156 return true;
157
158 return false;
159 }
160
161 extern struct console early_efi_console;
162 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
163
164 #ifdef CONFIG_EFI_MIXED
165 extern void efi_thunk_runtime_setup(void);
166 extern efi_status_t efi_thunk_set_virtual_address_map(
167 void *phys_set_virtual_address_map,
168 unsigned long memory_map_size,
169 unsigned long descriptor_size,
170 u32 descriptor_version,
171 efi_memory_desc_t *virtual_map);
172 #else
efi_thunk_runtime_setup(void)173 static inline void efi_thunk_runtime_setup(void) {}
efi_thunk_set_virtual_address_map(void * phys_set_virtual_address_map,unsigned long memory_map_size,unsigned long descriptor_size,u32 descriptor_version,efi_memory_desc_t * virtual_map)174 static inline efi_status_t efi_thunk_set_virtual_address_map(
175 void *phys_set_virtual_address_map,
176 unsigned long memory_map_size,
177 unsigned long descriptor_size,
178 u32 descriptor_version,
179 efi_memory_desc_t *virtual_map)
180 {
181 return EFI_SUCCESS;
182 }
183 #endif /* CONFIG_EFI_MIXED */
184
185
186 /* arch specific definitions used by the stub code */
187
188 struct efi_config {
189 u64 image_handle;
190 u64 table;
191 u64 allocate_pool;
192 u64 allocate_pages;
193 u64 get_memory_map;
194 u64 free_pool;
195 u64 free_pages;
196 u64 locate_handle;
197 u64 handle_protocol;
198 u64 exit_boot_services;
199 u64 text_output;
200 efi_status_t (*call)(unsigned long, ...);
201 bool is64;
202 } __packed;
203
204 __pure const struct efi_config *__efi_early(void);
205
206 #define efi_call_early(f, ...) \
207 __efi_early()->call(__efi_early()->f, __VA_ARGS__);
208
209 extern bool efi_reboot_required(void);
210
211 #else
parse_efi_setup(u64 phys_addr,u32 data_len)212 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
efi_reboot_required(void)213 static inline bool efi_reboot_required(void)
214 {
215 return false;
216 }
217 #endif /* CONFIG_EFI */
218
219 #endif /* _ASM_X86_EFI_H */
220