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