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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/tlb.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 #ifdef CONFIG_X86_32
30
31
32 extern unsigned long asmlinkage efi_call_phys(void *, ...);
33
34 /*
35  * Wrap all the virtual calls in a way that forces the parameters on the stack.
36  */
37
38 /* Use this macro if your virtual returns a non-void value */
39 #define efi_call_virt(f, args...) \
40 ({                                                                      \
41         efi_status_t __s;                                               \
42         kernel_fpu_begin();                                             \
43         __s = ((efi_##f##_t __attribute__((regparm(0)))*)               \
44                 efi.systab->runtime->f)(args);                          \
45         kernel_fpu_end();                                               \
46         __s;                                                            \
47 })
48
49 /* Use this macro if your virtual call does not return any value */
50 #define __efi_call_virt(f, args...) \
51 ({                                                                      \
52         kernel_fpu_begin();                                             \
53         ((efi_##f##_t __attribute__((regparm(0)))*)                     \
54                 efi.systab->runtime->f)(args);                          \
55         kernel_fpu_end();                                               \
56 })
57
58 #define efi_ioremap(addr, size, type, attr)     ioremap_cache(addr, size)
59
60 #else /* !CONFIG_X86_32 */
61
62 #define EFI_LOADER_SIGNATURE    "EL64"
63
64 extern u64 asmlinkage efi_call(void *fp, ...);
65
66 #define efi_call_phys(f, args...)               efi_call((f), args)
67
68 /*
69  * Scratch space used for switching the pagetable in the EFI stub
70  */
71 struct efi_scratch {
72         u64     r15;
73         u64     prev_cr3;
74         pgd_t   *efi_pgt;
75         bool    use_pgd;
76         u64     phys_stack;
77 } __packed;
78
79 #define efi_call_virt(f, ...)                                           \
80 ({                                                                      \
81         efi_status_t __s;                                               \
82                                                                         \
83         efi_sync_low_kernel_mappings();                                 \
84         preempt_disable();                                              \
85         __kernel_fpu_begin();                                           \
86                                                                         \
87         if (efi_scratch.use_pgd) {                                      \
88                 efi_scratch.prev_cr3 = read_cr3();                      \
89                 write_cr3((unsigned long)efi_scratch.efi_pgt);          \
90                 __flush_tlb_all();                                      \
91         }                                                               \
92                                                                         \
93         __s = efi_call((void *)efi.systab->runtime->f, __VA_ARGS__);    \
94                                                                         \
95         if (efi_scratch.use_pgd) {                                      \
96                 write_cr3(efi_scratch.prev_cr3);                        \
97                 __flush_tlb_all();                                      \
98         }                                                               \
99                                                                         \
100         __kernel_fpu_end();                                             \
101         preempt_enable();                                               \
102         __s;                                                            \
103 })
104
105 /*
106  * All X86_64 virt calls return non-void values. Thus, use non-void call for
107  * virt calls that would be void on X86_32.
108  */
109 #define __efi_call_virt(f, args...) efi_call_virt(f, args)
110
111 extern void __iomem *__init efi_ioremap(unsigned long addr, unsigned long size,
112                                         u32 type, u64 attribute);
113
114 #ifdef CONFIG_KASAN
115 /*
116  * CONFIG_KASAN may redefine memset to __memset.  __memset function is present
117  * only in kernel binary.  Since the EFI stub linked into a separate binary it
118  * doesn't have __memset().  So we should use standard memset from
119  * arch/x86/boot/compressed/string.c.  The same applies to memcpy and memmove.
120  */
121 #undef memcpy
122 #undef memset
123 #undef memmove
124 #endif
125
126 #endif /* CONFIG_X86_32 */
127
128 extern struct efi_scratch efi_scratch;
129 extern void __init efi_set_executable(efi_memory_desc_t *md, bool executable);
130 extern int __init efi_memblock_x86_reserve_range(void);
131 extern pgd_t * __init efi_call_phys_prolog(void);
132 extern void __init efi_call_phys_epilog(pgd_t *save_pgd);
133 extern void __init efi_print_memmap(void);
134 extern void __init efi_unmap_memmap(void);
135 extern void __init efi_memory_uc(u64 addr, unsigned long size);
136 extern void __init efi_map_region(efi_memory_desc_t *md);
137 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
138 extern void efi_sync_low_kernel_mappings(void);
139 extern int __init efi_alloc_page_tables(void);
140 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
141 extern void __init efi_cleanup_page_tables(unsigned long pa_memmap, unsigned num_pages);
142 extern void __init old_map_region(efi_memory_desc_t *md);
143 extern void __init runtime_code_page_mkexec(void);
144 extern void __init efi_runtime_mkexec(void);
145 extern void __init efi_dump_pagetable(void);
146 extern void __init efi_apply_memmap_quirks(void);
147 extern int __init efi_reuse_config(u64 tables, int nr_tables);
148 extern void efi_delete_dummy_variable(void);
149
150 struct efi_setup_data {
151         u64 fw_vendor;
152         u64 runtime;
153         u64 tables;
154         u64 smbios;
155         u64 reserved[8];
156 };
157
158 extern u64 efi_setup;
159
160 #ifdef CONFIG_EFI
161
162 static inline bool efi_is_native(void)
163 {
164         return IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT);
165 }
166
167 static inline bool efi_runtime_supported(void)
168 {
169         if (efi_is_native())
170                 return true;
171
172         if (IS_ENABLED(CONFIG_EFI_MIXED) && !efi_enabled(EFI_OLD_MEMMAP))
173                 return true;
174
175         return false;
176 }
177
178 extern struct console early_efi_console;
179 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
180
181 #ifdef CONFIG_EFI_MIXED
182 extern void efi_thunk_runtime_setup(void);
183 extern efi_status_t efi_thunk_set_virtual_address_map(
184         void *phys_set_virtual_address_map,
185         unsigned long memory_map_size,
186         unsigned long descriptor_size,
187         u32 descriptor_version,
188         efi_memory_desc_t *virtual_map);
189 #else
190 static inline void efi_thunk_runtime_setup(void) {}
191 static inline efi_status_t efi_thunk_set_virtual_address_map(
192         void *phys_set_virtual_address_map,
193         unsigned long memory_map_size,
194         unsigned long descriptor_size,
195         u32 descriptor_version,
196         efi_memory_desc_t *virtual_map)
197 {
198         return EFI_SUCCESS;
199 }
200 #endif /* CONFIG_EFI_MIXED */
201
202
203 /* arch specific definitions used by the stub code */
204
205 struct efi_config {
206         u64 image_handle;
207         u64 table;
208         u64 allocate_pool;
209         u64 allocate_pages;
210         u64 get_memory_map;
211         u64 free_pool;
212         u64 free_pages;
213         u64 locate_handle;
214         u64 handle_protocol;
215         u64 exit_boot_services;
216         u64 text_output;
217         efi_status_t (*call)(unsigned long, ...);
218         bool is64;
219 } __packed;
220
221 __pure const struct efi_config *__efi_early(void);
222
223 #define efi_call_early(f, ...)                                          \
224         __efi_early()->call(__efi_early()->f, __VA_ARGS__);
225
226 extern bool efi_reboot_required(void);
227
228 #else
229 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
230 static inline bool efi_reboot_required(void)
231 {
232         return false;
233 }
234 #endif /* CONFIG_EFI */
235
236 #endif /* _ASM_X86_EFI_H */