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31
32#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
34#include <linux/kernel.h>
35#include <linux/init.h>
36#include <linux/efi.h>
37#include <linux/efi-bgrt.h>
38#include <linux/export.h>
39#include <linux/memblock.h>
40#include <linux/slab.h>
41#include <linux/spinlock.h>
42#include <linux/uaccess.h>
43#include <linux/time.h>
44#include <linux/io.h>
45#include <linux/reboot.h>
46#include <linux/bcd.h>
47
48#include <asm/setup.h>
49#include <asm/efi.h>
50#include <asm/e820/api.h>
51#include <asm/time.h>
52#include <asm/set_memory.h>
53#include <asm/tlbflush.h>
54#include <asm/x86_init.h>
55#include <asm/uv/uv.h>
56
57static unsigned long efi_systab_phys __initdata;
58static unsigned long prop_phys = EFI_INVALID_TABLE_ADDR;
59static unsigned long uga_phys = EFI_INVALID_TABLE_ADDR;
60static unsigned long efi_runtime, efi_nr_tables;
61
62unsigned long efi_fw_vendor, efi_config_table;
63
64static const efi_config_table_type_t arch_tables[] __initconst = {
65 {EFI_PROPERTIES_TABLE_GUID, "PROP", &prop_phys},
66 {UGA_IO_PROTOCOL_GUID, "UGA", &uga_phys},
67#ifdef CONFIG_X86_UV
68 {UV_SYSTEM_TABLE_GUID, "UVsystab", &uv_systab_phys},
69#endif
70 {NULL_GUID, NULL, NULL},
71};
72
73static const unsigned long * const efi_tables[] = {
74 &efi.acpi,
75 &efi.acpi20,
76 &efi.smbios,
77 &efi.smbios3,
78 &uga_phys,
79#ifdef CONFIG_X86_UV
80 &uv_systab_phys,
81#endif
82 &efi_fw_vendor,
83 &efi_runtime,
84 &efi_config_table,
85 &efi.esrt,
86 &prop_phys,
87 &efi_mem_attr_table,
88#ifdef CONFIG_EFI_RCI2_TABLE
89 &rci2_table_phys,
90#endif
91 &efi.tpm_log,
92 &efi.tpm_final_log,
93 &efi_rng_seed,
94};
95
96u64 efi_setup;
97
98static int add_efi_memmap __initdata;
99static int __init setup_add_efi_memmap(char *arg)
100{
101 add_efi_memmap = 1;
102 return 0;
103}
104early_param("add_efi_memmap", setup_add_efi_memmap);
105
106void __init efi_find_mirror(void)
107{
108 efi_memory_desc_t *md;
109 u64 mirror_size = 0, total_size = 0;
110
111 if (!efi_enabled(EFI_MEMMAP))
112 return;
113
114 for_each_efi_memory_desc(md) {
115 unsigned long long start = md->phys_addr;
116 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
117
118 total_size += size;
119 if (md->attribute & EFI_MEMORY_MORE_RELIABLE) {
120 memblock_mark_mirror(start, size);
121 mirror_size += size;
122 }
123 }
124 if (mirror_size)
125 pr_info("Memory: %lldM/%lldM mirrored memory\n",
126 mirror_size>>20, total_size>>20);
127}
128
129
130
131
132
133
134
135
136static void __init do_add_efi_memmap(void)
137{
138 efi_memory_desc_t *md;
139
140 if (!efi_enabled(EFI_MEMMAP))
141 return;
142
143 for_each_efi_memory_desc(md) {
144 unsigned long long start = md->phys_addr;
145 unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
146 int e820_type;
147
148 switch (md->type) {
149 case EFI_LOADER_CODE:
150 case EFI_LOADER_DATA:
151 case EFI_BOOT_SERVICES_CODE:
152 case EFI_BOOT_SERVICES_DATA:
153 case EFI_CONVENTIONAL_MEMORY:
154 if (efi_soft_reserve_enabled()
155 && (md->attribute & EFI_MEMORY_SP))
156 e820_type = E820_TYPE_SOFT_RESERVED;
157 else if (md->attribute & EFI_MEMORY_WB)
158 e820_type = E820_TYPE_RAM;
159 else
160 e820_type = E820_TYPE_RESERVED;
161 break;
162 case EFI_ACPI_RECLAIM_MEMORY:
163 e820_type = E820_TYPE_ACPI;
164 break;
165 case EFI_ACPI_MEMORY_NVS:
166 e820_type = E820_TYPE_NVS;
167 break;
168 case EFI_UNUSABLE_MEMORY:
169 e820_type = E820_TYPE_UNUSABLE;
170 break;
171 case EFI_PERSISTENT_MEMORY:
172 e820_type = E820_TYPE_PMEM;
173 break;
174 default:
175
176
177
178
179
180 e820_type = E820_TYPE_RESERVED;
181 break;
182 }
183
184 e820__range_add(start, size, e820_type);
185 }
186 e820__update_table(e820_table);
187}
188
189
190
191
192
193
194
195
196static bool do_efi_soft_reserve(void)
197{
198 efi_memory_desc_t *md;
199
200 if (!efi_enabled(EFI_MEMMAP))
201 return false;
202
203 if (!efi_soft_reserve_enabled())
204 return false;
205
206 for_each_efi_memory_desc(md)
207 if (md->type == EFI_CONVENTIONAL_MEMORY &&
208 (md->attribute & EFI_MEMORY_SP))
209 return true;
210 return false;
211}
212
213int __init efi_memblock_x86_reserve_range(void)
214{
215 struct efi_info *e = &boot_params.efi_info;
216 struct efi_memory_map_data data;
217 phys_addr_t pmap;
218 int rv;
219
220 if (efi_enabled(EFI_PARAVIRT))
221 return 0;
222
223
224 if (IS_ENABLED(CONFIG_X86_32) && e->efi_memmap_hi > 0) {
225 pr_err("Memory map is above 4GB, disabling EFI.\n");
226 return -EINVAL;
227 }
228 pmap = (phys_addr_t)(e->efi_memmap | ((u64)e->efi_memmap_hi << 32));
229
230 data.phys_map = pmap;
231 data.size = e->efi_memmap_size;
232 data.desc_size = e->efi_memdesc_size;
233 data.desc_version = e->efi_memdesc_version;
234
235 rv = efi_memmap_init_early(&data);
236 if (rv)
237 return rv;
238
239 if (add_efi_memmap || do_efi_soft_reserve())
240 do_add_efi_memmap();
241
242 efi_fake_memmap_early();
243
244 WARN(efi.memmap.desc_version != 1,
245 "Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
246 efi.memmap.desc_version);
247
248 memblock_reserve(pmap, efi.memmap.nr_map * efi.memmap.desc_size);
249 set_bit(EFI_PRESERVE_BS_REGIONS, &efi.flags);
250
251 return 0;
252}
253
254#define OVERFLOW_ADDR_SHIFT (64 - EFI_PAGE_SHIFT)
255#define OVERFLOW_ADDR_MASK (U64_MAX << OVERFLOW_ADDR_SHIFT)
256#define U64_HIGH_BIT (~(U64_MAX >> 1))
257
258static bool __init efi_memmap_entry_valid(const efi_memory_desc_t *md, int i)
259{
260 u64 end = (md->num_pages << EFI_PAGE_SHIFT) + md->phys_addr - 1;
261 u64 end_hi = 0;
262 char buf[64];
263
264 if (md->num_pages == 0) {
265 end = 0;
266 } else if (md->num_pages > EFI_PAGES_MAX ||
267 EFI_PAGES_MAX - md->num_pages <
268 (md->phys_addr >> EFI_PAGE_SHIFT)) {
269 end_hi = (md->num_pages & OVERFLOW_ADDR_MASK)
270 >> OVERFLOW_ADDR_SHIFT;
271
272 if ((md->phys_addr & U64_HIGH_BIT) && !(end & U64_HIGH_BIT))
273 end_hi += 1;
274 } else {
275 return true;
276 }
277
278 pr_warn_once(FW_BUG "Invalid EFI memory map entries:\n");
279
280 if (end_hi) {
281 pr_warn("mem%02u: %s range=[0x%016llx-0x%llx%016llx] (invalid)\n",
282 i, efi_md_typeattr_format(buf, sizeof(buf), md),
283 md->phys_addr, end_hi, end);
284 } else {
285 pr_warn("mem%02u: %s range=[0x%016llx-0x%016llx] (invalid)\n",
286 i, efi_md_typeattr_format(buf, sizeof(buf), md),
287 md->phys_addr, end);
288 }
289 return false;
290}
291
292static void __init efi_clean_memmap(void)
293{
294 efi_memory_desc_t *out = efi.memmap.map;
295 const efi_memory_desc_t *in = out;
296 const efi_memory_desc_t *end = efi.memmap.map_end;
297 int i, n_removal;
298
299 for (i = n_removal = 0; in < end; i++) {
300 if (efi_memmap_entry_valid(in, i)) {
301 if (out != in)
302 memcpy(out, in, efi.memmap.desc_size);
303 out = (void *)out + efi.memmap.desc_size;
304 } else {
305 n_removal++;
306 }
307 in = (void *)in + efi.memmap.desc_size;
308 }
309
310 if (n_removal > 0) {
311 struct efi_memory_map_data data = {
312 .phys_map = efi.memmap.phys_map,
313 .desc_version = efi.memmap.desc_version,
314 .desc_size = efi.memmap.desc_size,
315 .size = efi.memmap.desc_size * (efi.memmap.nr_map - n_removal),
316 .flags = 0,
317 };
318
319 pr_warn("Removing %d invalid memory map entries.\n", n_removal);
320 efi_memmap_install(&data);
321 }
322}
323
324void __init efi_print_memmap(void)
325{
326 efi_memory_desc_t *md;
327 int i = 0;
328
329 for_each_efi_memory_desc(md) {
330 char buf[64];
331
332 pr_info("mem%02u: %s range=[0x%016llx-0x%016llx] (%lluMB)\n",
333 i++, efi_md_typeattr_format(buf, sizeof(buf), md),
334 md->phys_addr,
335 md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1,
336 (md->num_pages >> (20 - EFI_PAGE_SHIFT)));
337 }
338}
339
340static int __init efi_systab_init(unsigned long phys)
341{
342 int size = efi_enabled(EFI_64BIT) ? sizeof(efi_system_table_64_t)
343 : sizeof(efi_system_table_32_t);
344 const efi_table_hdr_t *hdr;
345 bool over4g = false;
346 void *p;
347 int ret;
348
349 hdr = p = early_memremap_ro(phys, size);
350 if (p == NULL) {
351 pr_err("Couldn't map the system table!\n");
352 return -ENOMEM;
353 }
354
355 ret = efi_systab_check_header(hdr, 1);
356 if (ret) {
357 early_memunmap(p, size);
358 return ret;
359 }
360
361 if (efi_enabled(EFI_64BIT)) {
362 const efi_system_table_64_t *systab64 = p;
363
364 efi_runtime = systab64->runtime;
365 over4g = systab64->runtime > U32_MAX;
366
367 if (efi_setup) {
368 struct efi_setup_data *data;
369
370 data = early_memremap_ro(efi_setup, sizeof(*data));
371 if (!data) {
372 early_memunmap(p, size);
373 return -ENOMEM;
374 }
375
376 efi_fw_vendor = (unsigned long)data->fw_vendor;
377 efi_config_table = (unsigned long)data->tables;
378
379 over4g |= data->fw_vendor > U32_MAX ||
380 data->tables > U32_MAX;
381
382 early_memunmap(data, sizeof(*data));
383 } else {
384 efi_fw_vendor = systab64->fw_vendor;
385 efi_config_table = systab64->tables;
386
387 over4g |= systab64->fw_vendor > U32_MAX ||
388 systab64->tables > U32_MAX;
389 }
390 efi_nr_tables = systab64->nr_tables;
391 } else {
392 const efi_system_table_32_t *systab32 = p;
393
394 efi_fw_vendor = systab32->fw_vendor;
395 efi_runtime = systab32->runtime;
396 efi_config_table = systab32->tables;
397 efi_nr_tables = systab32->nr_tables;
398 }
399
400 efi.runtime_version = hdr->revision;
401
402 efi_systab_report_header(hdr, efi_fw_vendor);
403 early_memunmap(p, size);
404
405 if (IS_ENABLED(CONFIG_X86_32) && over4g) {
406 pr_err("EFI data located above 4GB, disabling EFI.\n");
407 return -EINVAL;
408 }
409
410 return 0;
411}
412
413static int __init efi_config_init(const efi_config_table_type_t *arch_tables)
414{
415 void *config_tables;
416 int sz, ret;
417
418 if (efi_nr_tables == 0)
419 return 0;
420
421 if (efi_enabled(EFI_64BIT))
422 sz = sizeof(efi_config_table_64_t);
423 else
424 sz = sizeof(efi_config_table_32_t);
425
426
427
428
429 config_tables = early_memremap(efi_config_table, efi_nr_tables * sz);
430 if (config_tables == NULL) {
431 pr_err("Could not map Configuration table!\n");
432 return -ENOMEM;
433 }
434
435 ret = efi_config_parse_tables(config_tables, efi_nr_tables,
436 arch_tables);
437
438 early_memunmap(config_tables, efi_nr_tables * sz);
439 return ret;
440}
441
442void __init efi_init(void)
443{
444 if (IS_ENABLED(CONFIG_X86_32) &&
445 (boot_params.efi_info.efi_systab_hi ||
446 boot_params.efi_info.efi_memmap_hi)) {
447 pr_info("Table located above 4GB, disabling EFI.\n");
448 return;
449 }
450
451 efi_systab_phys = boot_params.efi_info.efi_systab |
452 ((__u64)boot_params.efi_info.efi_systab_hi << 32);
453
454 if (efi_systab_init(efi_systab_phys))
455 return;
456
457 if (efi_reuse_config(efi_config_table, efi_nr_tables))
458 return;
459
460 if (efi_config_init(arch_tables))
461 return;
462
463
464
465
466
467
468 if (!efi_runtime_supported())
469 pr_info("No EFI runtime due to 32/64-bit mismatch with kernel\n");
470
471 if (!efi_runtime_supported() || efi_runtime_disabled()) {
472 efi_memmap_unmap();
473 return;
474 }
475
476
477 if (prop_phys != EFI_INVALID_TABLE_ADDR) {
478 efi_properties_table_t *tbl;
479
480 tbl = early_memremap_ro(prop_phys, sizeof(*tbl));
481 if (tbl == NULL) {
482 pr_err("Could not map Properties table!\n");
483 } else {
484 if (tbl->memory_protection_attribute &
485 EFI_PROPERTIES_RUNTIME_MEMORY_PROTECTION_NON_EXECUTABLE_PE_DATA)
486 set_bit(EFI_NX_PE_DATA, &efi.flags);
487
488 early_memunmap(tbl, sizeof(*tbl));
489 }
490 }
491
492 set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
493 efi_clean_memmap();
494
495 if (efi_enabled(EFI_DBG))
496 efi_print_memmap();
497}
498
499#if defined(CONFIG_X86_32) || defined(CONFIG_X86_UV)
500
501void __init efi_set_executable(efi_memory_desc_t *md, bool executable)
502{
503 u64 addr, npages;
504
505 addr = md->virt_addr;
506 npages = md->num_pages;
507
508 memrange_efi_to_native(&addr, &npages);
509
510 if (executable)
511 set_memory_x(addr, npages);
512 else
513 set_memory_nx(addr, npages);
514}
515
516void __init runtime_code_page_mkexec(void)
517{
518 efi_memory_desc_t *md;
519
520
521 for_each_efi_memory_desc(md) {
522 if (md->type != EFI_RUNTIME_SERVICES_CODE)
523 continue;
524
525 efi_set_executable(md, true);
526 }
527}
528
529void __init efi_memory_uc(u64 addr, unsigned long size)
530{
531 unsigned long page_shift = 1UL << EFI_PAGE_SHIFT;
532 u64 npages;
533
534 npages = round_up(size, page_shift) / page_shift;
535 memrange_efi_to_native(&addr, &npages);
536 set_memory_uc(addr, npages);
537}
538
539void __init old_map_region(efi_memory_desc_t *md)
540{
541 u64 start_pfn, end_pfn, end;
542 unsigned long size;
543 void *va;
544
545 start_pfn = PFN_DOWN(md->phys_addr);
546 size = md->num_pages << PAGE_SHIFT;
547 end = md->phys_addr + size;
548 end_pfn = PFN_UP(end);
549
550 if (pfn_range_is_mapped(start_pfn, end_pfn)) {
551 va = __va(md->phys_addr);
552
553 if (!(md->attribute & EFI_MEMORY_WB))
554 efi_memory_uc((u64)(unsigned long)va, size);
555 } else
556 va = efi_ioremap(md->phys_addr, size,
557 md->type, md->attribute);
558
559 md->virt_addr = (u64) (unsigned long) va;
560 if (!va)
561 pr_err("ioremap of 0x%llX failed!\n",
562 (unsigned long long)md->phys_addr);
563}
564
565#endif
566
567
568static void __init efi_merge_regions(void)
569{
570 efi_memory_desc_t *md, *prev_md = NULL;
571
572 for_each_efi_memory_desc(md) {
573 u64 prev_size;
574
575 if (!prev_md) {
576 prev_md = md;
577 continue;
578 }
579
580 if (prev_md->type != md->type ||
581 prev_md->attribute != md->attribute) {
582 prev_md = md;
583 continue;
584 }
585
586 prev_size = prev_md->num_pages << EFI_PAGE_SHIFT;
587
588 if (md->phys_addr == (prev_md->phys_addr + prev_size)) {
589 prev_md->num_pages += md->num_pages;
590 md->type = EFI_RESERVED_TYPE;
591 md->attribute = 0;
592 continue;
593 }
594 prev_md = md;
595 }
596}
597
598static void *realloc_pages(void *old_memmap, int old_shift)
599{
600 void *ret;
601
602 ret = (void *)__get_free_pages(GFP_KERNEL, old_shift + 1);
603 if (!ret)
604 goto out;
605
606
607
608
609 if (!old_memmap)
610 return ret;
611
612 memcpy(ret, old_memmap, PAGE_SIZE << old_shift);
613
614out:
615 free_pages((unsigned long)old_memmap, old_shift);
616 return ret;
617}
618
619
620
621
622
623
624
625static inline void *efi_map_next_entry_reverse(void *entry)
626{
627
628 if (!entry)
629 return efi.memmap.map_end - efi.memmap.desc_size;
630
631 entry -= efi.memmap.desc_size;
632 if (entry < efi.memmap.map)
633 return NULL;
634
635 return entry;
636}
637
638
639
640
641
642
643
644
645
646
647
648
649static void *efi_map_next_entry(void *entry)
650{
651 if (!efi_have_uv1_memmap() && efi_enabled(EFI_64BIT)) {
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669 return efi_map_next_entry_reverse(entry);
670 }
671
672
673 if (!entry)
674 return efi.memmap.map;
675
676 entry += efi.memmap.desc_size;
677 if (entry >= efi.memmap.map_end)
678 return NULL;
679
680 return entry;
681}
682
683static bool should_map_region(efi_memory_desc_t *md)
684{
685
686
687
688 if (md->attribute & EFI_MEMORY_RUNTIME)
689 return true;
690
691
692
693
694
695
696 if (IS_ENABLED(CONFIG_X86_32))
697 return false;
698
699
700
701
702
703 if (md->type == EFI_CONVENTIONAL_MEMORY &&
704 efi_soft_reserve_enabled() &&
705 (md->attribute & EFI_MEMORY_SP))
706 return false;
707
708
709
710
711
712 if (efi_is_mixed()) {
713 if (md->type == EFI_CONVENTIONAL_MEMORY ||
714 md->type == EFI_LOADER_DATA ||
715 md->type == EFI_LOADER_CODE)
716 return true;
717 }
718
719
720
721
722
723
724
725 if (md->type == EFI_BOOT_SERVICES_CODE ||
726 md->type == EFI_BOOT_SERVICES_DATA)
727 return true;
728
729 return false;
730}
731
732
733
734
735
736static void * __init efi_map_regions(int *count, int *pg_shift)
737{
738 void *p, *new_memmap = NULL;
739 unsigned long left = 0;
740 unsigned long desc_size;
741 efi_memory_desc_t *md;
742
743 desc_size = efi.memmap.desc_size;
744
745 p = NULL;
746 while ((p = efi_map_next_entry(p))) {
747 md = p;
748
749 if (!should_map_region(md))
750 continue;
751
752 efi_map_region(md);
753
754 if (left < desc_size) {
755 new_memmap = realloc_pages(new_memmap, *pg_shift);
756 if (!new_memmap)
757 return NULL;
758
759 left += PAGE_SIZE << *pg_shift;
760 (*pg_shift)++;
761 }
762
763 memcpy(new_memmap + (*count * desc_size), md, desc_size);
764
765 left -= desc_size;
766 (*count)++;
767 }
768
769 return new_memmap;
770}
771
772static void __init kexec_enter_virtual_mode(void)
773{
774#ifdef CONFIG_KEXEC_CORE
775 efi_memory_desc_t *md;
776 unsigned int num_pages;
777
778
779
780
781
782
783
784 if (efi_is_mixed() || efi_have_uv1_memmap()) {
785 efi_memmap_unmap();
786 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
787 return;
788 }
789
790 if (efi_alloc_page_tables()) {
791 pr_err("Failed to allocate EFI page tables\n");
792 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
793 return;
794 }
795
796
797
798
799
800 for_each_efi_memory_desc(md)
801 efi_map_region_fixed(md);
802
803
804
805
806
807 efi_memmap_unmap();
808
809 if (efi_memmap_init_late(efi.memmap.phys_map,
810 efi.memmap.desc_size * efi.memmap.nr_map)) {
811 pr_err("Failed to remap late EFI memory map\n");
812 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
813 return;
814 }
815
816 num_pages = ALIGN(efi.memmap.nr_map * efi.memmap.desc_size, PAGE_SIZE);
817 num_pages >>= PAGE_SHIFT;
818
819 if (efi_setup_page_tables(efi.memmap.phys_map, num_pages)) {
820 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
821 return;
822 }
823
824 efi_sync_low_kernel_mappings();
825 efi_native_runtime_setup();
826#endif
827}
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843
844
845
846
847
848
849
850
851static void __init __efi_enter_virtual_mode(void)
852{
853 int count = 0, pg_shift = 0;
854 void *new_memmap = NULL;
855 efi_status_t status;
856 unsigned long pa;
857
858 if (efi_alloc_page_tables()) {
859 pr_err("Failed to allocate EFI page tables\n");
860 goto err;
861 }
862
863 efi_merge_regions();
864 new_memmap = efi_map_regions(&count, &pg_shift);
865 if (!new_memmap) {
866 pr_err("Error reallocating memory, EFI runtime non-functional!\n");
867 goto err;
868 }
869
870 pa = __pa(new_memmap);
871
872
873
874
875
876
877 efi_memmap_unmap();
878
879 if (efi_memmap_init_late(pa, efi.memmap.desc_size * count)) {
880 pr_err("Failed to remap late EFI memory map\n");
881 goto err;
882 }
883
884 if (efi_enabled(EFI_DBG)) {
885 pr_info("EFI runtime memory map:\n");
886 efi_print_memmap();
887 }
888
889 if (efi_setup_page_tables(pa, 1 << pg_shift))
890 goto err;
891
892 efi_sync_low_kernel_mappings();
893
894 status = efi_set_virtual_address_map(efi.memmap.desc_size * count,
895 efi.memmap.desc_size,
896 efi.memmap.desc_version,
897 (efi_memory_desc_t *)pa,
898 efi_systab_phys);
899 if (status != EFI_SUCCESS) {
900 pr_err("Unable to switch EFI into virtual mode (status=%lx)!\n",
901 status);
902 goto err;
903 }
904
905 efi_check_for_embedded_firmwares();
906 efi_free_boot_services();
907
908 if (!efi_is_mixed())
909 efi_native_runtime_setup();
910 else
911 efi_thunk_runtime_setup();
912
913
914
915
916
917
918 efi_runtime_update_mappings();
919
920
921 efi_delete_dummy_variable();
922 return;
923
924err:
925 clear_bit(EFI_RUNTIME_SERVICES, &efi.flags);
926}
927
928void __init efi_enter_virtual_mode(void)
929{
930 if (efi_enabled(EFI_PARAVIRT))
931 return;
932
933 efi.runtime = (efi_runtime_services_t *)efi_runtime;
934
935 if (efi_setup)
936 kexec_enter_virtual_mode();
937 else
938 __efi_enter_virtual_mode();
939
940 efi_dump_pagetable();
941}
942
943bool efi_is_table_address(unsigned long phys_addr)
944{
945 unsigned int i;
946
947 if (phys_addr == EFI_INVALID_TABLE_ADDR)
948 return false;
949
950 for (i = 0; i < ARRAY_SIZE(efi_tables); i++)
951 if (*(efi_tables[i]) == phys_addr)
952 return true;
953
954 return false;
955}
956
957char *efi_systab_show_arch(char *str)
958{
959 if (uga_phys != EFI_INVALID_TABLE_ADDR)
960 str += sprintf(str, "UGA=0x%lx\n", uga_phys);
961 return str;
962}
963
964#define EFI_FIELD(var) efi_ ## var
965
966#define EFI_ATTR_SHOW(name) \
967static ssize_t name##_show(struct kobject *kobj, \
968 struct kobj_attribute *attr, char *buf) \
969{ \
970 return sprintf(buf, "0x%lx\n", EFI_FIELD(name)); \
971}
972
973EFI_ATTR_SHOW(fw_vendor);
974EFI_ATTR_SHOW(runtime);
975EFI_ATTR_SHOW(config_table);
976
977struct kobj_attribute efi_attr_fw_vendor = __ATTR_RO(fw_vendor);
978struct kobj_attribute efi_attr_runtime = __ATTR_RO(runtime);
979struct kobj_attribute efi_attr_config_table = __ATTR_RO(config_table);
980
981umode_t efi_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n)
982{
983 if (attr == &efi_attr_fw_vendor.attr) {
984 if (efi_enabled(EFI_PARAVIRT) ||
985 efi_fw_vendor == EFI_INVALID_TABLE_ADDR)
986 return 0;
987 } else if (attr == &efi_attr_runtime.attr) {
988 if (efi_runtime == EFI_INVALID_TABLE_ADDR)
989 return 0;
990 } else if (attr == &efi_attr_config_table.attr) {
991 if (efi_config_table == EFI_INVALID_TABLE_ADDR)
992 return 0;
993 }
994 return attr->mode;
995}
996