1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <asm/fpu/api.h>
6 #include <asm/processor-flags.h>
8 #include <asm/nospec-branch.h>
9 #include <asm/mmu_context.h>
11 #include <linux/build_bug.h>
12 #include <linux/kernel.h>
13 #include <linux/pgtable.h>
15 extern unsigned long efi_fw_vendor, efi_config_table;
16 extern unsigned long efi_mixed_mode_stack_pa;
19 * We map the EFI regions needed for runtime services non-contiguously,
20 * with preserved alignment on virtual addresses starting from -4G down
21 * for a total max space of 64G. This way, we provide for stable runtime
22 * services addresses across kernels so that a kexec'd kernel can still
25 * This is the main reason why we're doing stable VA mappings for RT
29 #define EFI32_LOADER_SIGNATURE "EL32"
30 #define EFI64_LOADER_SIGNATURE "EL64"
32 #define ARCH_EFI_IRQ_FLAGS_MASK X86_EFLAGS_IF
34 #define EFI_UNACCEPTED_UNIT_SIZE PMD_SIZE
37 * The EFI services are called through variadic functions in many cases. These
38 * functions are implemented in assembler and support only a fixed number of
39 * arguments. The macros below allows us to check at build time that we don't
40 * try to call them with too many arguments.
42 * __efi_nargs() will return the number of arguments if it is 7 or less, and
43 * cause a BUILD_BUG otherwise. The limitations of the C preprocessor make it
44 * impossible to calculate the exact number of arguments beyond some
45 * pre-defined limit. The maximum number of arguments currently supported by
46 * any of the thunks is 7, so this is good enough for now and can be extended
47 * in the obvious way if we ever need more.
50 #define __efi_nargs(...) __efi_nargs_(__VA_ARGS__)
51 #define __efi_nargs_(...) __efi_nargs__(0, ##__VA_ARGS__, \
52 __efi_arg_sentinel(9), __efi_arg_sentinel(8), \
53 __efi_arg_sentinel(7), __efi_arg_sentinel(6), \
54 __efi_arg_sentinel(5), __efi_arg_sentinel(4), \
55 __efi_arg_sentinel(3), __efi_arg_sentinel(2), \
56 __efi_arg_sentinel(1), __efi_arg_sentinel(0))
57 #define __efi_nargs__(_0, _1, _2, _3, _4, _5, _6, _7, _8, _9, n, ...) \
58 __take_second_arg(n, \
59 ({ BUILD_BUG_ON_MSG(1, "__efi_nargs limit exceeded"); 10; }))
60 #define __efi_arg_sentinel(n) , n
63 * __efi_nargs_check(f, n, ...) will cause a BUILD_BUG if the ellipsis
64 * represents more than n arguments.
67 #define __efi_nargs_check(f, n, ...) \
68 __efi_nargs_check_(f, __efi_nargs(__VA_ARGS__), n)
69 #define __efi_nargs_check_(f, p, n) __efi_nargs_check__(f, p, n)
70 #define __efi_nargs_check__(f, p, n) ({ \
73 #f " called with too many arguments (" #p ">" #n ")"); \
76 static inline void efi_fpu_begin(void)
79 * The UEFI calling convention (UEFI spec 2.3.2 and 2.3.4) requires
80 * that FCW and MXCSR (64-bit) must be initialized prior to calling
81 * UEFI code. (Oddly the spec does not require that the FPU stack
84 kernel_fpu_begin_mask(KFPU_387 | KFPU_MXCSR);
87 static inline void efi_fpu_end(void)
93 #define EFI_X86_KERNEL_ALLOC_LIMIT (SZ_512M - 1)
95 #define arch_efi_call_virt_setup() \
98 firmware_restrict_branch_speculation_start(); \
101 #define arch_efi_call_virt_teardown() \
103 firmware_restrict_branch_speculation_end(); \
107 #else /* !CONFIG_X86_32 */
108 #define EFI_X86_KERNEL_ALLOC_LIMIT EFI_ALLOC_LIMIT
110 extern asmlinkage u64 __efi_call(void *fp, ...);
112 extern bool efi_disable_ibt_for_runtime;
114 #define efi_call(...) ({ \
115 __efi_nargs_check(efi_call, 7, __VA_ARGS__); \
116 __efi_call(__VA_ARGS__); \
119 #define arch_efi_call_virt_setup() \
121 efi_sync_low_kernel_mappings(); \
123 firmware_restrict_branch_speculation_start(); \
127 #undef arch_efi_call_virt
128 #define arch_efi_call_virt(p, f, args...) ({ \
129 u64 ret, ibt = ibt_save(efi_disable_ibt_for_runtime); \
130 ret = efi_call((void *)p->f, args); \
135 #define arch_efi_call_virt_teardown() \
138 firmware_restrict_branch_speculation_end(); \
144 * CONFIG_KASAN may redefine memset to __memset. __memset function is present
145 * only in kernel binary. Since the EFI stub linked into a separate binary it
146 * doesn't have __memset(). So we should use standard memset from
147 * arch/x86/boot/compressed/string.c. The same applies to memcpy and memmove.
154 #endif /* CONFIG_X86_32 */
156 extern int __init efi_memblock_x86_reserve_range(void);
157 extern void __init efi_print_memmap(void);
158 extern void __init efi_map_region(efi_memory_desc_t *md);
159 extern void __init efi_map_region_fixed(efi_memory_desc_t *md);
160 extern void efi_sync_low_kernel_mappings(void);
161 extern int __init efi_alloc_page_tables(void);
162 extern int __init efi_setup_page_tables(unsigned long pa_memmap, unsigned num_pages);
163 extern void __init efi_runtime_update_mappings(void);
164 extern void __init efi_dump_pagetable(void);
165 extern void __init efi_apply_memmap_quirks(void);
166 extern int __init efi_reuse_config(u64 tables, int nr_tables);
167 extern void efi_delete_dummy_variable(void);
168 extern void efi_crash_gracefully_on_page_fault(unsigned long phys_addr);
169 extern void efi_free_boot_services(void);
171 void efi_enter_mm(void);
172 void efi_leave_mm(void);
174 /* kexec external ABI */
175 struct efi_setup_data {
183 extern u64 efi_setup;
186 extern u64 __efi64_thunk(u32, ...);
188 #define efi64_thunk(...) ({ \
189 u64 __pad[3]; /* must have space for 3 args on the stack */ \
190 __efi_nargs_check(efi64_thunk, 9, __VA_ARGS__); \
191 __efi64_thunk(__VA_ARGS__, __pad); \
194 static inline bool efi_is_mixed(void)
196 if (!IS_ENABLED(CONFIG_EFI_MIXED))
198 return IS_ENABLED(CONFIG_X86_64) && !efi_enabled(EFI_64BIT);
201 static inline bool efi_runtime_supported(void)
203 if (IS_ENABLED(CONFIG_X86_64) == efi_enabled(EFI_64BIT))
206 return IS_ENABLED(CONFIG_EFI_MIXED);
209 extern void parse_efi_setup(u64 phys_addr, u32 data_len);
211 extern void efi_thunk_runtime_setup(void);
212 efi_status_t efi_set_virtual_address_map(unsigned long memory_map_size,
213 unsigned long descriptor_size,
214 u32 descriptor_version,
215 efi_memory_desc_t *virtual_map,
216 unsigned long systab_phys);
218 /* arch specific definitions used by the stub code */
220 #ifdef CONFIG_EFI_MIXED
222 #define EFI_ALLOC_LIMIT (efi_is_64bit() ? ULONG_MAX : U32_MAX)
224 #define ARCH_HAS_EFISTUB_WRAPPERS
226 static inline bool efi_is_64bit(void)
228 extern const bool efi_is64;
233 static inline bool efi_is_native(void)
235 return efi_is_64bit();
238 #define efi_table_attr(inst, attr) \
239 (efi_is_native() ? (inst)->attr \
240 : efi_mixed_table_attr((inst), attr))
242 #define efi_mixed_table_attr(inst, attr) \
243 (__typeof__(inst->attr)) \
244 _Generic(inst->mixed_mode.attr, \
245 u32: (unsigned long)(inst->mixed_mode.attr), \
246 default: (inst->mixed_mode.attr))
249 * The following macros allow translating arguments if necessary from native to
250 * mixed mode. The use case for this is to initialize the upper 32 bits of
251 * output parameters, and where the 32-bit method requires a 64-bit argument,
252 * which must be split up into two arguments to be thunked properly.
254 * As examples, the AllocatePool boot service returns the address of the
255 * allocation, but it will not set the high 32 bits of the address. To ensure
256 * that the full 64-bit address is initialized, we zero-init the address before
259 * The FreePages boot service takes a 64-bit physical address even in 32-bit
260 * mode. For the thunk to work correctly, a native 64-bit call of
261 * free_pages(addr, size)
262 * must be translated to
263 * efi64_thunk(free_pages, addr & U32_MAX, addr >> 32, size)
264 * so that the two 32-bit halves of addr get pushed onto the stack separately.
267 static inline void *efi64_zero_upper(void *p)
273 static inline u32 efi64_convert_status(efi_status_t status)
275 return (u32)(status | (u64)status >> 32);
278 #define __efi64_split(val) (val) & U32_MAX, (u64)(val) >> 32
280 #define __efi64_argmap_free_pages(addr, size) \
283 #define __efi64_argmap_get_memory_map(mm_size, mm, key, size, ver) \
284 ((mm_size), (mm), efi64_zero_upper(key), efi64_zero_upper(size), (ver))
286 #define __efi64_argmap_allocate_pool(type, size, buffer) \
287 ((type), (size), efi64_zero_upper(buffer))
289 #define __efi64_argmap_create_event(type, tpl, f, c, event) \
290 ((type), (tpl), (f), (c), efi64_zero_upper(event))
292 #define __efi64_argmap_set_timer(event, type, time) \
293 ((event), (type), lower_32_bits(time), upper_32_bits(time))
295 #define __efi64_argmap_wait_for_event(num, event, index) \
296 ((num), (event), efi64_zero_upper(index))
298 #define __efi64_argmap_handle_protocol(handle, protocol, interface) \
299 ((handle), (protocol), efi64_zero_upper(interface))
301 #define __efi64_argmap_locate_protocol(protocol, reg, interface) \
302 ((protocol), (reg), efi64_zero_upper(interface))
304 #define __efi64_argmap_locate_device_path(protocol, path, handle) \
305 ((protocol), (path), efi64_zero_upper(handle))
307 #define __efi64_argmap_exit(handle, status, size, data) \
308 ((handle), efi64_convert_status(status), (size), (data))
311 #define __efi64_argmap_get_location(protocol, seg, bus, dev, func) \
312 ((protocol), efi64_zero_upper(seg), efi64_zero_upper(bus), \
313 efi64_zero_upper(dev), efi64_zero_upper(func))
316 #define __efi64_argmap_load_file(protocol, path, policy, bufsize, buf) \
317 ((protocol), (path), (policy), efi64_zero_upper(bufsize), (buf))
319 /* Graphics Output Protocol */
320 #define __efi64_argmap_query_mode(gop, mode, size, info) \
321 ((gop), (mode), efi64_zero_upper(size), efi64_zero_upper(info))
324 #define __efi64_argmap_hash_log_extend_event(prot, fl, addr, size, ev) \
325 ((prot), (fl), 0ULL, (u64)(addr), 0ULL, (u64)(size), 0ULL, ev)
328 #define __efi64_argmap_get_memory_space_descriptor(phys, desc) \
329 (__efi64_split(phys), (desc))
331 #define __efi64_argmap_set_memory_space_attributes(phys, size, flags) \
332 (__efi64_split(phys), __efi64_split(size), __efi64_split(flags))
335 #define __efi64_argmap_open(prot, newh, fname, mode, attr) \
336 ((prot), efi64_zero_upper(newh), (fname), __efi64_split(mode), \
339 #define __efi64_argmap_set_position(pos) (__efi64_split(pos))
341 /* file system protocol */
342 #define __efi64_argmap_open_volume(prot, file) \
343 ((prot), efi64_zero_upper(file))
345 /* Memory Attribute Protocol */
346 #define __efi64_argmap_get_memory_attributes(protocol, phys, size, flags) \
347 ((protocol), __efi64_split(phys), __efi64_split(size), (flags))
349 #define __efi64_argmap_set_memory_attributes(protocol, phys, size, flags) \
350 ((protocol), __efi64_split(phys), __efi64_split(size), __efi64_split(flags))
352 #define __efi64_argmap_clear_memory_attributes(protocol, phys, size, flags) \
353 ((protocol), __efi64_split(phys), __efi64_split(size), __efi64_split(flags))
356 * The macros below handle the plumbing for the argument mapping. To add a
357 * mapping for a specific EFI method, simply define a macro
358 * __efi64_argmap_<method name>, following the examples above.
361 #define __efi64_thunk_map(inst, func, ...) \
362 efi64_thunk(inst->mixed_mode.func, \
363 __efi64_argmap(__efi64_argmap_ ## func(__VA_ARGS__), \
366 #define __efi64_argmap(mapped, args) \
367 __PASTE(__efi64_argmap__, __efi_nargs(__efi_eat mapped))(mapped, args)
368 #define __efi64_argmap__0(mapped, args) __efi_eval mapped
369 #define __efi64_argmap__1(mapped, args) __efi_eval args
371 #define __efi_eat(...)
372 #define __efi_eval(...) __VA_ARGS__
374 static inline efi_status_t __efi64_widen_efi_status(u64 status)
376 /* use rotate to move the value of bit #31 into position #63 */
377 return ror64(rol32(status, 1), 1);
380 /* The macro below handles dispatching via the thunk if needed */
382 #define efi_fn_call(inst, func, ...) \
383 (efi_is_native() ? (inst)->func(__VA_ARGS__) \
384 : efi_mixed_call((inst), func, ##__VA_ARGS__))
386 #define efi_mixed_call(inst, func, ...) \
387 _Generic(inst->func(__VA_ARGS__), \
389 __efi64_widen_efi_status( \
390 __efi64_thunk_map(inst, func, ##__VA_ARGS__)), \
391 u64: ({ BUILD_BUG(); ULONG_MAX; }), \
393 (__typeof__(inst->func(__VA_ARGS__))) \
394 __efi64_thunk_map(inst, func, ##__VA_ARGS__))
396 #else /* CONFIG_EFI_MIXED */
398 static inline bool efi_is_64bit(void)
400 return IS_ENABLED(CONFIG_X86_64);
403 #endif /* CONFIG_EFI_MIXED */
405 extern bool efi_reboot_required(void);
406 extern bool efi_is_table_address(unsigned long phys_addr);
408 extern void efi_reserve_boot_services(void);
410 static inline void parse_efi_setup(u64 phys_addr, u32 data_len) {}
411 static inline bool efi_reboot_required(void)
415 static inline bool efi_is_table_address(unsigned long phys_addr)
419 static inline void efi_reserve_boot_services(void)
422 #endif /* CONFIG_EFI */
424 #ifdef CONFIG_EFI_FAKE_MEMMAP
425 extern void __init efi_fake_memmap_early(void);
426 extern void __init efi_fake_memmap(void);
428 static inline void efi_fake_memmap_early(void)
432 static inline void efi_fake_memmap(void)
437 extern int __init efi_memmap_alloc(unsigned int num_entries,
438 struct efi_memory_map_data *data);
439 extern void __efi_memmap_free(u64 phys, unsigned long size,
440 unsigned long flags);
441 #define __efi_memmap_free __efi_memmap_free
443 extern int __init efi_memmap_install(struct efi_memory_map_data *data);
444 extern int __init efi_memmap_split_count(efi_memory_desc_t *md,
445 struct range *range);
446 extern void __init efi_memmap_insert(struct efi_memory_map *old_memmap,
447 void *buf, struct efi_mem_range *mem);
449 #define arch_ima_efi_boot_mode \
450 ({ extern struct boot_params boot_params; boot_params.secure_boot; })
452 #ifdef CONFIG_EFI_RUNTIME_MAP
453 int efi_get_runtime_map_size(void);
454 int efi_get_runtime_map_desc_size(void);
455 int efi_runtime_map_copy(void *buf, size_t bufsz);
457 static inline int efi_get_runtime_map_size(void)
462 static inline int efi_get_runtime_map_desc_size(void)
467 static inline int efi_runtime_map_copy(void *buf, size_t bufsz)
474 #endif /* _ASM_X86_EFI_H */