1
2#ifndef _ASM_X86_EFI_H
3#define _ASM_X86_EFI_H
4
5#include <asm/fpu/api.h>
6#include <asm/processor-flags.h>
7#include <asm/tlb.h>
8#include <asm/nospec-branch.h>
9#include <asm/mmu_context.h>
10#include <linux/build_bug.h>
11#include <linux/kernel.h>
12#include <linux/pgtable.h>
13
14extern unsigned long efi_fw_vendor, efi_config_table;
15extern unsigned long efi_mixed_mode_stack_pa;
16
17
18
19
20
21
22
23
24
25
26
27
28#define EFI32_LOADER_SIGNATURE "EL32"
29#define EFI64_LOADER_SIGNATURE "EL64"
30
31#define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
32
33
34
35
36
37
38
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40
41
42
43
44
45
46
47#define __efi_nargs(...) __efi_nargs_(__VA_ARGS__)
48#define __efi_nargs_(...) __efi_nargs__(0, ##__VA_ARGS__, \
49 __efi_arg_sentinel(7), __efi_arg_sentinel(6), \
50 __efi_arg_sentinel(5), __efi_arg_sentinel(4), \
51 __efi_arg_sentinel(3), __efi_arg_sentinel(2), \
52 __efi_arg_sentinel(1), __efi_arg_sentinel(0))
53#define __efi_nargs__(_0, _1, _2, _3, _4, _5, _6, _7, n, ...) \
54 __take_second_arg(n, \
55 ({ BUILD_BUG_ON_MSG(1, "__efi_nargs limit exceeded"); 8; }))
56#define __efi_arg_sentinel(n) , n
57
58
59
60
61
62
63#define __efi_nargs_check(f, n, ...) \
64 __efi_nargs_check_(f, __efi_nargs(__VA_ARGS__), n)
65#define __efi_nargs_check_(f, p, n) __efi_nargs_check__(f, p, n)
66#define __efi_nargs_check__(f, p, n) ({ \
67 BUILD_BUG_ON_MSG( \
68 (p) > (n), \
69 #f " called with too many arguments (" #p ">" #n ")"); \
70})
71
72static inline void efi_fpu_begin(void)
73{
74
75
76
77
78
79
80 kernel_fpu_begin_mask(KFPU_387 | KFPU_MXCSR);
81}
82
83static inline void efi_fpu_end(void)
84{
85 kernel_fpu_end();
86}
87
88#ifdef CONFIG_X86_32
89#define arch_efi_call_virt_setup() \
90({ \
91 efi_fpu_begin(); \
92 firmware_restrict_branch_speculation_start(); \
93})
94
95#define arch_efi_call_virt_teardown() \
96({ \
97 firmware_restrict_branch_speculation_end(); \
98 efi_fpu_end(); \
99})
100
101#define arch_efi_call_virt(p, f, args...) p->f(args)
102
103#else
104
105#define EFI_LOADER_SIGNATURE "EL64"
106
107extern asmlinkage u64 __efi_call(void *fp, ...);
108
109#define efi_call(...) ({ \
110 __efi_nargs_check(efi_call, 7, __VA_ARGS__); \
111 __efi_call(__VA_ARGS__); \
112})
113
114#define arch_efi_call_virt_setup() \
115({ \
116 efi_sync_low_kernel_mappings(); \
117 efi_fpu_begin(); \
118 firmware_restrict_branch_speculation_start(); \
119 efi_enter_mm(); \
120})
121
122#define arch_efi_call_virt(p, f, args...) \
123 efi_call((void *)p->f, args) \
124
125#define arch_efi_call_virt_teardown() \
126({ \
127 efi_leave_mm(); \
128 firmware_restrict_branch_speculation_end(); \
129 efi_fpu_end(); \
130})
131
132#ifdef CONFIG_KASAN
133
134
135
136
137
138
139#undef memcpy
140#undef memset
141#undef memmove
142#endif
143
144#endif
145
146extern int __init efi_memblock_x86_reserve_range(void);
147extern void __init efi_print_memmap(void);
148extern void __init efi_map_region(efi_memory_desc_t *md);
149extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
150extern void efi_sync_low_kernel_mappings(void);
151extern int __init efi_alloc_page_tables(void);
152extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
153extern void __init efi_runtime_update_mappings(void);
154extern void __init efi_dump_pagetable(void);
155extern void __init efi_apply_memmap_quirks(void);
156extern int __init efi_reuse_config(u64 tables, int nr_tables);
157extern void efi_delete_dummy_variable(void);
158extern void efi_crash_gracefully_on_page_fault(unsigned long phys_addr);
159extern void efi_free_boot_services(void);
160
161void efi_enter_mm(void);
162void efi_leave_mm(void);
163
164
165struct efi_setup_data {
166 u64 fw_vendor;
167 u64 __unused;
168 u64 tables;
169 u64 smbios;
170 u64 reserved[8];
171};
172
173extern u64 efi_setup;
174
175#ifdef CONFIG_EFI
176extern efi_status_t __efi64_thunk(u32, ...);
177
178#define efi64_thunk(...) ({ \
179 __efi_nargs_check(efi64_thunk, 6, __VA_ARGS__); \
180 __efi64_thunk(__VA_ARGS__); \
181})
182
183static inline bool efi_is_mixed(void)
184{
185 if (!IS_ENABLED(CONFIG_EFI_MIXED))
186 return false;
187 return IS_ENABLED(CONFIG_X86_64) && !efi_enabled(EFI_64BIT);
188}
189
190static inline bool efi_runtime_supported(void)
191{
192 if (IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT))
193 return true;
194
195 return IS_ENABLED(CONFIG_EFI_MIXED);
196}
197
198extern void parse_efi_setup(u64 phys_addr, u32 data_len);
199
200extern void efifb_setup_from_dmi(struct screen_info *si, const char *opt);
201
202extern void efi_thunk_runtime_setup(void);
203efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
204 unsigned long descriptor_size,
205 u32 descriptor_version,
206 efi_memory_desc_t *virtual_map,
207 unsigned long systab_phys);
208
209
210
211#ifdef CONFIG_EFI_MIXED
212
213#define ARCH_HAS_EFISTUB_WRAPPERS
214
215static inline bool efi_is_64bit(void)
216{
217 extern const bool efi_is64;
218
219 return efi_is64;
220}
221
222static inline bool efi_is_native(void)
223{
224 return efi_is_64bit();
225}
226
227#define efi_mixed_mode_cast(attr) \
228 __builtin_choose_expr( \
229 __builtin_types_compatible_p(u32, __typeof__(attr)), \
230 (unsigned long)(attr), (attr))
231
232#define efi_table_attr(inst, attr) \
233 (efi_is_native() \
234 ? inst->attr \
235 : (__typeof__(inst->attr)) \
236 efi_mixed_mode_cast(inst->mixed_mode.attr))
237
238
239
240
241
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243
244
245
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247
248
249
250
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253
254
255
256
257static inline void *efi64_zero_upper(void *p)
258{
259 ((u32 *)p)[1] = 0;
260 return p;
261}
262
263static inline u32 efi64_convert_status(efi_status_t status)
264{
265 return (u32)(status | (u64)status >> 32);
266}
267
268#define __efi64_argmap_free_pages(addr, size) \
269 ((addr), 0, (size))
270
271#define __efi64_argmap_get_memory_map(mm_size, mm, key, size, ver) \
272 ((mm_size), (mm), efi64_zero_upper(key), efi64_zero_upper(size), (ver))
273
274#define __efi64_argmap_allocate_pool(type, size, buffer) \
275 ((type), (size), efi64_zero_upper(buffer))
276
277#define __efi64_argmap_create_event(type, tpl, f, c, event) \
278 ((type), (tpl), (f), (c), efi64_zero_upper(event))
279
280#define __efi64_argmap_set_timer(event, type, time) \
281 ((event), (type), lower_32_bits(time), upper_32_bits(time))
282
283#define __efi64_argmap_wait_for_event(num, event, index) \
284 ((num), (event), efi64_zero_upper(index))
285
286#define __efi64_argmap_handle_protocol(handle, protocol, interface) \
287 ((handle), (protocol), efi64_zero_upper(interface))
288
289#define __efi64_argmap_locate_protocol(protocol, reg, interface) \
290 ((protocol), (reg), efi64_zero_upper(interface))
291
292#define __efi64_argmap_locate_device_path(protocol, path, handle) \
293 ((protocol), (path), efi64_zero_upper(handle))
294
295#define __efi64_argmap_exit(handle, status, size, data) \
296 ((handle), efi64_convert_status(status), (size), (data))
297
298
299#define __efi64_argmap_get_location(protocol, seg, bus, dev, func) \
300 ((protocol), efi64_zero_upper(seg), efi64_zero_upper(bus), \
301 efi64_zero_upper(dev), efi64_zero_upper(func))
302
303
304#define __efi64_argmap_load_file(protocol, path, policy, bufsize, buf) \
305 ((protocol), (path), (policy), efi64_zero_upper(bufsize), (buf))
306
307
308#define __efi64_argmap_query_mode(gop, mode, size, info) \
309 ((gop), (mode), efi64_zero_upper(size), efi64_zero_upper(info))
310
311
312
313
314
315
316
317#define __efi64_thunk_map(inst, func, ...) \
318 efi64_thunk(inst->mixed_mode.func, \
319 __efi64_argmap(__efi64_argmap_ ## func(__VA_ARGS__), \
320 (__VA_ARGS__)))
321
322#define __efi64_argmap(mapped, args) \
323 __PASTE(__efi64_argmap__, __efi_nargs(__efi_eat mapped))(mapped, args)
324#define __efi64_argmap__0(mapped, args) __efi_eval mapped
325#define __efi64_argmap__1(mapped, args) __efi_eval args
326
327#define __efi_eat(...)
328#define __efi_eval(...) __VA_ARGS__
329
330
331
332#define efi_call_proto(inst, func, ...) \
333 (efi_is_native() \
334 ? inst->func(inst, ##__VA_ARGS__) \
335 : __efi64_thunk_map(inst, func, inst, ##__VA_ARGS__))
336
337#define efi_bs_call(func, ...) \
338 (efi_is_native() \
339 ? efi_system_table->boottime->func(__VA_ARGS__) \
340 : __efi64_thunk_map(efi_table_attr(efi_system_table, \
341 boottime), \
342 func, __VA_ARGS__))
343
344#define efi_rt_call(func, ...) \
345 (efi_is_native() \
346 ? efi_system_table->runtime->func(__VA_ARGS__) \
347 : __efi64_thunk_map(efi_table_attr(efi_system_table, \
348 runtime), \
349 func, __VA_ARGS__))
350
351#else
352
353static inline bool efi_is_64bit(void)
354{
355 return IS_ENABLED(CONFIG_X86_64);
356}
357
358#endif
359
360extern bool efi_reboot_required(void);
361extern bool efi_is_table_address(unsigned long phys_addr);
362
363extern void efi_find_mirror(void);
364extern void efi_reserve_boot_services(void);
365#else
366static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
367static inline bool efi_reboot_required(void)
368{
369 return false;
370}
371static inline bool efi_is_table_address(unsigned long phys_addr)
372{
373 return false;
374}
375static inline void efi_find_mirror(void)
376{
377}
378static inline void efi_reserve_boot_services(void)
379{
380}
381#endif
382
383#ifdef CONFIG_EFI_FAKE_MEMMAP
384extern void __init efi_fake_memmap_early(void);
385#else
386static inline void efi_fake_memmap_early(void)
387{
388}
389#endif
390
391#define arch_ima_efi_boot_mode \
392 ({ extern struct boot_params boot_params; boot_params.secure_boot; })
393
394#endif
395