summaryrefslogtreecommitdiff
path: root/arch/x86/boot/compressed/eboot.c
blob: 09f36c0d9d4fe187886bd6bb49892c7de1a434c2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
/* -----------------------------------------------------------------------
 *
 *   Copyright 2011 Intel Corporation; author Matt Fleming
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

#include <linux/efi.h>
#include <linux/pci.h>

#include <asm/efi.h>
#include <asm/e820/types.h>
#include <asm/setup.h>
#include <asm/desc.h>

#include "../string.h"
#include "eboot.h"

static efi_system_table_t *sys_table;

static struct efi_config *efi_early;

__pure const struct efi_config *__efi_early(void)
{
	return efi_early;
}

#define BOOT_SERVICES(bits)						\
static void setup_boot_services##bits(struct efi_config *c)		\
{									\
	efi_system_table_##bits##_t *table;				\
									\
	table = (typeof(table))sys_table;				\
									\
	c->runtime_services = table->runtime;				\
	c->boot_services = table->boottime;				\
	c->text_output = table->con_out;				\
}
BOOT_SERVICES(32);
BOOT_SERVICES(64);

static inline efi_status_t __open_volume32(void *__image, void **__fh)
{
	efi_file_io_interface_t *io;
	efi_loaded_image_32_t *image = __image;
	efi_file_handle_32_t *fh;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	efi_status_t status;
	void *handle = (void *)(unsigned long)image->device_handle;
	unsigned long func;

	status = efi_call_early(handle_protocol, handle,
				&fs_proto, (void **)&io);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to handle fs_proto\n");
		return status;
	}

	func = (unsigned long)io->open_volume;
	status = efi_early->call(func, io, &fh);
	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to open volume\n");

	*__fh = fh;
	return status;
}

static inline efi_status_t __open_volume64(void *__image, void **__fh)
{
	efi_file_io_interface_t *io;
	efi_loaded_image_64_t *image = __image;
	efi_file_handle_64_t *fh;
	efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
	efi_status_t status;
	void *handle = (void *)(unsigned long)image->device_handle;
	unsigned long func;

	status = efi_call_early(handle_protocol, handle,
				&fs_proto, (void **)&io);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to handle fs_proto\n");
		return status;
	}

	func = (unsigned long)io->open_volume;
	status = efi_early->call(func, io, &fh);
	if (status != EFI_SUCCESS)
		efi_printk(sys_table, "Failed to open volume\n");

	*__fh = fh;
	return status;
}

efi_status_t
efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
{
	if (efi_early->is64)
		return __open_volume64(__image, __fh);

	return __open_volume32(__image, __fh);
}

void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
{
	efi_call_proto(efi_simple_text_output_protocol, output_string,
		       efi_early->text_output, str);
}

static efi_status_t
__setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
{
	struct pci_setup_rom *rom = NULL;
	efi_status_t status;
	unsigned long size;
	uint64_t attributes;

	status = efi_early->call(pci->attributes, pci,
				 EfiPciIoAttributeOperationGet, 0, 0,
				 &attributes);
	if (status != EFI_SUCCESS)
		return status;

	if (!pci->romimage || !pci->romsize)
		return EFI_INVALID_PARAMETER;

	size = pci->romsize + sizeof(*rom);

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for rom\n");
		return status;
	}

	memset(rom, 0, sizeof(*rom));

	rom->data.type = SETUP_PCI;
	rom->data.len = size - sizeof(struct setup_data);
	rom->data.next = 0;
	rom->pcilen = pci->romsize;
	*__rom = rom;

	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_VENDOR_ID, 1, &(rom->vendor));

	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->vendor\n");
		goto free_struct;
	}

	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_DEVICE_ID, 1, &(rom->devid));

	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->devid\n");
		goto free_struct;
	}

	status = efi_early->call(pci->get_location, pci, &(rom->segment),
				 &(rom->bus), &(rom->device), &(rom->function));

	if (status != EFI_SUCCESS)
		goto free_struct;

	memcpy(rom->romdata, (void *)(unsigned long)pci->romimage,
	       pci->romsize);
	return status;

free_struct:
	efi_call_early(free_pool, rom);
	return status;
}

static void
setup_efi_pci32(struct boot_params *params, void **pci_handle,
		unsigned long size)
{
	efi_pci_io_protocol_32 *pci = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	u32 *handles = (u32 *)(unsigned long)pci_handle;
	efi_status_t status;
	unsigned long nr_pci;
	struct setup_data *data;
	int i;

	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;

	nr_pci = size / sizeof(u32);
	for (i = 0; i < nr_pci; i++) {
		struct pci_setup_rom *rom = NULL;
		u32 h = handles[i];

		status = efi_call_early(handle_protocol, h,
					&pci_proto, (void **)&pci);

		if (status != EFI_SUCCESS)
			continue;

		if (!pci)
			continue;

		status = __setup_efi_pci32(pci, &rom);
		if (status != EFI_SUCCESS)
			continue;

		if (data)
			data->next = (unsigned long)rom;
		else
			params->hdr.setup_data = (unsigned long)rom;

		data = (struct setup_data *)rom;

	}
}

static efi_status_t
__setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
{
	struct pci_setup_rom *rom;
	efi_status_t status;
	unsigned long size;
	uint64_t attributes;

	status = efi_early->call(pci->attributes, pci,
				 EfiPciIoAttributeOperationGet, 0,
				 &attributes);
	if (status != EFI_SUCCESS)
		return status;

	if (!pci->romimage || !pci->romsize)
		return EFI_INVALID_PARAMETER;

	size = pci->romsize + sizeof(*rom);

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for rom\n");
		return status;
	}

	rom->data.type = SETUP_PCI;
	rom->data.len = size - sizeof(struct setup_data);
	rom->data.next = 0;
	rom->pcilen = pci->romsize;
	*__rom = rom;

	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_VENDOR_ID, 1, &(rom->vendor));

	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->vendor\n");
		goto free_struct;
	}

	status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
				 PCI_DEVICE_ID, 1, &(rom->devid));

	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to read rom->devid\n");
		goto free_struct;
	}

	status = efi_early->call(pci->get_location, pci, &(rom->segment),
				 &(rom->bus), &(rom->device), &(rom->function));

	if (status != EFI_SUCCESS)
		goto free_struct;

	memcpy(rom->romdata, (void *)(unsigned long)pci->romimage,
	       pci->romsize);
	return status;

free_struct:
	efi_call_early(free_pool, rom);
	return status;

}

static void
setup_efi_pci64(struct boot_params *params, void **pci_handle,
		unsigned long size)
{
	efi_pci_io_protocol_64 *pci = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	u64 *handles = (u64 *)(unsigned long)pci_handle;
	efi_status_t status;
	unsigned long nr_pci;
	struct setup_data *data;
	int i;

	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;

	nr_pci = size / sizeof(u64);
	for (i = 0; i < nr_pci; i++) {
		struct pci_setup_rom *rom = NULL;
		u64 h = handles[i];

		status = efi_call_early(handle_protocol, h,
					&pci_proto, (void **)&pci);

		if (status != EFI_SUCCESS)
			continue;

		if (!pci)
			continue;

		status = __setup_efi_pci64(pci, &rom);
		if (status != EFI_SUCCESS)
			continue;

		if (data)
			data->next = (unsigned long)rom;
		else
			params->hdr.setup_data = (unsigned long)rom;

		data = (struct setup_data *)rom;

	}
}

/*
 * There's no way to return an informative status from this function,
 * because any analysis (and printing of error messages) needs to be
 * done directly at the EFI function call-site.
 *
 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
 * just didn't find any PCI devices, but there's no way to tell outside
 * the context of the call.
 */
static void setup_efi_pci(struct boot_params *params)
{
	efi_status_t status;
	void **pci_handle = NULL;
	efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
	unsigned long size = 0;

	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&pci_proto, NULL, &size, pci_handle);

	if (status == EFI_BUFFER_TOO_SMALL) {
		status = efi_call_early(allocate_pool,
					EFI_LOADER_DATA,
					size, (void **)&pci_handle);

		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
			return;
		}

		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL, &pci_proto,
					NULL, &size, pci_handle);
	}

	if (status != EFI_SUCCESS)
		goto free_handle;

	if (efi_early->is64)
		setup_efi_pci64(params, pci_handle, size);
	else
		setup_efi_pci32(params, pci_handle, size);

free_handle:
	efi_call_early(free_pool, pci_handle);
}

static void retrieve_apple_device_properties(struct boot_params *boot_params)
{
	efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
	struct setup_data *data, *new;
	efi_status_t status;
	u32 size = 0;
	void *p;

	status = efi_call_early(locate_protocol, &guid, NULL, &p);
	if (status != EFI_SUCCESS)
		return;

	if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
		efi_printk(sys_table, "Unsupported properties proto version\n");
		return;
	}

	efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
	if (!size)
		return;

	do {
		status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
					size + sizeof(struct setup_data), &new);
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table,
					"Failed to alloc mem for properties\n");
			return;
		}

		status = efi_call_proto(apple_properties_protocol, get_all, p,
					new->data, &size);

		if (status == EFI_BUFFER_TOO_SMALL)
			efi_call_early(free_pool, new);
	} while (status == EFI_BUFFER_TOO_SMALL);

	new->type = SETUP_APPLE_PROPERTIES;
	new->len  = size;
	new->next = 0;

	data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
	if (!data)
		boot_params->hdr.setup_data = (unsigned long)new;
	else {
		while (data->next)
			data = (struct setup_data *)(unsigned long)data->next;
		data->next = (unsigned long)new;
	}
}

static const efi_char16_t apple[] = L"Apple";

static void setup_quirks(struct boot_params *boot_params)
{
	efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
		efi_table_attr(efi_system_table, fw_vendor, sys_table);

	if (!memcmp(fw_vendor, apple, sizeof(apple))) {
		if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
			retrieve_apple_device_properties(boot_params);
	}
}

static efi_status_t
setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
{
	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	unsigned long nr_ugas;
	u32 *handles = (u32 *)uga_handle;
	efi_status_t status = EFI_INVALID_PARAMETER;
	int i;

	first_uga = NULL;
	nr_ugas = size / sizeof(u32);
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;
		u32 handle = handles[i];

		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
		if (status != EFI_SUCCESS)
			continue;

		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);

		status = efi_early->call((unsigned long)uga->get_mode, uga,
					 &w, &h, &depth, &refresh);
		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
			*width = w;
			*height = h;

			/*
			 * Once we've found a UGA supporting PCIIO,
			 * don't bother looking any further.
			 */
			if (pciio)
				break;

			first_uga = uga;
		}
	}

	return status;
}

static efi_status_t
setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
{
	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	unsigned long nr_ugas;
	u64 *handles = (u64 *)uga_handle;
	efi_status_t status = EFI_INVALID_PARAMETER;
	int i;

	first_uga = NULL;
	nr_ugas = size / sizeof(u64);
	for (i = 0; i < nr_ugas; i++) {
		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
		u32 w, h, depth, refresh;
		void *pciio;
		u64 handle = handles[i];

		status = efi_call_early(handle_protocol, handle,
					&uga_proto, (void **)&uga);
		if (status != EFI_SUCCESS)
			continue;

		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);

		status = efi_early->call((unsigned long)uga->get_mode, uga,
					 &w, &h, &depth, &refresh);
		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
			*width = w;
			*height = h;

			/*
			 * Once we've found a UGA supporting PCIIO,
			 * don't bother looking any further.
			 */
			if (pciio)
				break;

			first_uga = uga;
		}
	}

	return status;
}

/*
 * See if we have Universal Graphics Adapter (UGA) protocol
 */
static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
			      unsigned long size)
{
	efi_status_t status;
	u32 width, height;
	void **uga_handle = NULL;

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)&uga_handle);
	if (status != EFI_SUCCESS)
		return status;

	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				uga_proto, NULL, &size, uga_handle);
	if (status != EFI_SUCCESS)
		goto free_handle;

	height = 0;
	width = 0;

	if (efi_early->is64)
		status = setup_uga64(uga_handle, size, &width, &height);
	else
		status = setup_uga32(uga_handle, size, &width, &height);

	if (!width && !height)
		goto free_handle;

	/* EFI framebuffer */
	si->orig_video_isVGA = VIDEO_TYPE_EFI;

	si->lfb_depth = 32;
	si->lfb_width = width;
	si->lfb_height = height;

	si->red_size = 8;
	si->red_pos = 16;
	si->green_size = 8;
	si->green_pos = 8;
	si->blue_size = 8;
	si->blue_pos = 0;
	si->rsvd_size = 8;
	si->rsvd_pos = 24;

free_handle:
	efi_call_early(free_pool, uga_handle);
	return status;
}

void setup_graphics(struct boot_params *boot_params)
{
	efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
	struct screen_info *si;
	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
	efi_status_t status;
	unsigned long size;
	void **gop_handle = NULL;
	void **uga_handle = NULL;

	si = &boot_params->screen_info;
	memset(si, 0, sizeof(*si));

	size = 0;
	status = efi_call_early(locate_handle,
				EFI_LOCATE_BY_PROTOCOL,
				&graphics_proto, NULL, &size, gop_handle);
	if (status == EFI_BUFFER_TOO_SMALL)
		status = efi_setup_gop(NULL, si, &graphics_proto, size);

	if (status != EFI_SUCCESS) {
		size = 0;
		status = efi_call_early(locate_handle,
					EFI_LOCATE_BY_PROTOCOL,
					&uga_proto, NULL, &size, uga_handle);
		if (status == EFI_BUFFER_TOO_SMALL)
			setup_uga(si, &uga_proto, size);
	}
}

/*
 * Because the x86 boot code expects to be passed a boot_params we
 * need to create one ourselves (usually the bootloader would create
 * one for us).
 *
 * The caller is responsible for filling out ->code32_start in the
 * returned boot_params.
 */
struct boot_params *make_boot_params(struct efi_config *c)
{
	struct boot_params *boot_params;
	struct apm_bios_info *bi;
	struct setup_header *hdr;
	efi_loaded_image_t *image;
	void *options, *handle;
	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
	int options_size = 0;
	efi_status_t status;
	char *cmdline_ptr;
	u16 *s2;
	u8 *s1;
	int i;
	unsigned long ramdisk_addr;
	unsigned long ramdisk_size;

	efi_early = c;
	sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;

	/* Check if we were booted by the EFI firmware */
	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		return NULL;

	if (efi_early->is64)
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

	status = efi_call_early(handle_protocol, handle,
				&proto, (void *)&image);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
		return NULL;
	}

	status = efi_low_alloc(sys_table, 0x4000, 1,
			       (unsigned long *)&boot_params);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
		return NULL;
	}

	memset(boot_params, 0x0, 0x4000);

	hdr = &boot_params->hdr;
	bi = &boot_params->apm_bios_info;

	/* Copy the second sector to boot_params */
	memcpy(&hdr->jump, image->image_base + 512, 512);

	/*
	 * Fill out some of the header fields ourselves because the
	 * EFI firmware loader doesn't load the first sector.
	 */
	hdr->root_flags = 1;
	hdr->vid_mode = 0xffff;
	hdr->boot_flag = 0xAA55;

	hdr->type_of_loader = 0x21;

	/* Convert unicode cmdline to ascii */
	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
	if (!cmdline_ptr)
		goto fail;
	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
	/* Fill in upper bits of command line address, NOP on 32 bit  */
	boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;

	hdr->ramdisk_image = 0;
	hdr->ramdisk_size = 0;

	/* Clear APM BIOS info */
	memset(bi, 0, sizeof(*bi));

	status = efi_parse_options(cmdline_ptr);
	if (status != EFI_SUCCESS)
		goto fail2;

	status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
				      "initrd=", hdr->initrd_addr_max,
				      &ramdisk_addr, &ramdisk_size);

	if (status != EFI_SUCCESS &&
	    hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
		efi_printk(sys_table, "Trying to load files to higher address\n");
		status = handle_cmdline_files(sys_table, image,
				      (char *)(unsigned long)hdr->cmd_line_ptr,
				      "initrd=", -1UL,
				      &ramdisk_addr, &ramdisk_size);
	}

	if (status != EFI_SUCCESS)
		goto fail2;
	hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
	hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
	boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
	boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;

	return boot_params;
fail2:
	efi_free(sys_table, options_size, hdr->cmd_line_ptr);
fail:
	efi_free(sys_table, 0x4000, (unsigned long)boot_params);
	return NULL;
}

static void add_e820ext(struct boot_params *params,
			struct setup_data *e820ext, u32 nr_entries)
{
	struct setup_data *data;
	efi_status_t status;
	unsigned long size;

	e820ext->type = SETUP_E820_EXT;
	e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
	e820ext->next = 0;

	data = (struct setup_data *)(unsigned long)params->hdr.setup_data;

	while (data && data->next)
		data = (struct setup_data *)(unsigned long)data->next;

	if (data)
		data->next = (unsigned long)e820ext;
	else
		params->hdr.setup_data = (unsigned long)e820ext;
}

static efi_status_t setup_e820(struct boot_params *params,
			       struct setup_data *e820ext, u32 e820ext_size)
{
	struct boot_e820_entry *entry = params->e820_table;
	struct efi_info *efi = &params->efi_info;
	struct boot_e820_entry *prev = NULL;
	u32 nr_entries;
	u32 nr_desc;
	int i;

	nr_entries = 0;
	nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;

	for (i = 0; i < nr_desc; i++) {
		efi_memory_desc_t *d;
		unsigned int e820_type = 0;
		unsigned long m = efi->efi_memmap;

#ifdef CONFIG_X86_64
		m |= (u64)efi->efi_memmap_hi << 32;
#endif

		d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
		switch (d->type) {
		case EFI_RESERVED_TYPE:
		case EFI_RUNTIME_SERVICES_CODE:
		case EFI_RUNTIME_SERVICES_DATA:
		case EFI_MEMORY_MAPPED_IO:
		case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
		case EFI_PAL_CODE:
			e820_type = E820_TYPE_RESERVED;
			break;

		case EFI_UNUSABLE_MEMORY:
			e820_type = E820_TYPE_UNUSABLE;
			break;

		case EFI_ACPI_RECLAIM_MEMORY:
			e820_type = E820_TYPE_ACPI;
			break;

		case EFI_LOADER_CODE:
		case EFI_LOADER_DATA:
		case EFI_BOOT_SERVICES_CODE:
		case EFI_BOOT_SERVICES_DATA:
		case EFI_CONVENTIONAL_MEMORY:
			e820_type = E820_TYPE_RAM;
			break;

		case EFI_ACPI_MEMORY_NVS:
			e820_type = E820_TYPE_NVS;
			break;

		case EFI_PERSISTENT_MEMORY:
			e820_type = E820_TYPE_PMEM;
			break;

		default:
			continue;
		}

		/* Merge adjacent mappings */
		if (prev && prev->type == e820_type &&
		    (prev->addr + prev->size) == d->phys_addr) {
			prev->size += d->num_pages << 12;
			continue;
		}

		if (nr_entries == ARRAY_SIZE(params->e820_table)) {
			u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
				   sizeof(struct setup_data);

			if (!e820ext || e820ext_size < need)
				return EFI_BUFFER_TOO_SMALL;

			/* boot_params map full, switch to e820 extended */
			entry = (struct boot_e820_entry *)e820ext->data;
		}

		entry->addr = d->phys_addr;
		entry->size = d->num_pages << PAGE_SHIFT;
		entry->type = e820_type;
		prev = entry++;
		nr_entries++;
	}

	if (nr_entries > ARRAY_SIZE(params->e820_table)) {
		u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);

		add_e820ext(params, e820ext, nr_e820ext);
		nr_entries -= nr_e820ext;
	}

	params->e820_entries = (u8)nr_entries;

	return EFI_SUCCESS;
}

static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
				  u32 *e820ext_size)
{
	efi_status_t status;
	unsigned long size;

	size = sizeof(struct setup_data) +
		sizeof(struct e820_entry) * nr_desc;

	if (*e820ext) {
		efi_call_early(free_pool, *e820ext);
		*e820ext = NULL;
		*e820ext_size = 0;
	}

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				size, (void **)e820ext);
	if (status == EFI_SUCCESS)
		*e820ext_size = size;

	return status;
}

struct exit_boot_struct {
	struct boot_params *boot_params;
	struct efi_info *efi;
	struct setup_data *e820ext;
	__u32 e820ext_size;
	bool is64;
};

static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
				   struct efi_boot_memmap *map,
				   void *priv)
{
	static bool first = true;
	const char *signature;
	__u32 nr_desc;
	efi_status_t status;
	struct exit_boot_struct *p = priv;

	if (first) {
		nr_desc = *map->buff_size / *map->desc_size;
		if (nr_desc > ARRAY_SIZE(p->boot_params->e820_table)) {
			u32 nr_e820ext = nr_desc -
					ARRAY_SIZE(p->boot_params->e820_table);

			status = alloc_e820ext(nr_e820ext, &p->e820ext,
					       &p->e820ext_size);
			if (status != EFI_SUCCESS)
				return status;
		}
		first = false;
	}

	signature = p->is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
	memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));

	p->efi->efi_systab = (unsigned long)sys_table_arg;
	p->efi->efi_memdesc_size = *map->desc_size;
	p->efi->efi_memdesc_version = *map->desc_ver;
	p->efi->efi_memmap = (unsigned long)*map->map;
	p->efi->efi_memmap_size = *map->map_size;

#ifdef CONFIG_X86_64
	p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
	p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
#endif

	return EFI_SUCCESS;
}

static efi_status_t exit_boot(struct boot_params *boot_params,
			      void *handle, bool is64)
{
	unsigned long map_sz, key, desc_size, buff_size;
	efi_memory_desc_t *mem_map;
	struct setup_data *e820ext;
	__u32 e820ext_size;
	efi_status_t status;
	__u32 desc_version;
	struct efi_boot_memmap map;
	struct exit_boot_struct priv;

	map.map =		&mem_map;
	map.map_size =		&map_sz;
	map.desc_size =		&desc_size;
	map.desc_ver =		&desc_version;
	map.key_ptr =		&key;
	map.buff_size =		&buff_size;
	priv.boot_params =	boot_params;
	priv.efi =		&boot_params->efi_info;
	priv.e820ext =		NULL;
	priv.e820ext_size =	0;
	priv.is64 =		is64;

	/* Might as well exit boot services now */
	status = efi_exit_boot_services(sys_table, handle, &map, &priv,
					exit_boot_func);
	if (status != EFI_SUCCESS)
		return status;

	e820ext = priv.e820ext;
	e820ext_size = priv.e820ext_size;
	/* Historic? */
	boot_params->alt_mem_k = 32 * 1024;

	status = setup_e820(boot_params, e820ext, e820ext_size);
	if (status != EFI_SUCCESS)
		return status;

	return EFI_SUCCESS;
}

/*
 * On success we return a pointer to a boot_params structure, and NULL
 * on failure.
 */
struct boot_params *efi_main(struct efi_config *c,
			     struct boot_params *boot_params)
{
	struct desc_ptr *gdt = NULL;
	efi_loaded_image_t *image;
	struct setup_header *hdr = &boot_params->hdr;
	efi_status_t status;
	struct desc_struct *desc;
	void *handle;
	efi_system_table_t *_table;
	bool is64;

	efi_early = c;

	_table = (efi_system_table_t *)(unsigned long)efi_early->table;
	handle = (void *)(unsigned long)efi_early->image_handle;
	is64 = efi_early->is64;

	sys_table = _table;

	/* Check if we were booted by the EFI firmware */
	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
		goto fail;

	if (is64)
		setup_boot_services64(efi_early);
	else
		setup_boot_services32(efi_early);

	/*
	 * If the boot loader gave us a value for secure_boot then we use that,
	 * otherwise we ask the BIOS.
	 */
	if (boot_params->secure_boot == efi_secureboot_mode_unset)
		boot_params->secure_boot = efi_get_secureboot(sys_table);

	/* Ask the firmware to clear memory on unclean shutdown */
	efi_enable_reset_attack_mitigation(sys_table);
	efi_retrieve_tpm2_eventlog(sys_table);

	setup_graphics(boot_params);

	setup_efi_pci(boot_params);

	setup_quirks(boot_params);

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
				sizeof(*gdt), (void **)&gdt);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
		goto fail;
	}

	gdt->size = 0x800;
	status = efi_low_alloc(sys_table, gdt->size, 8,
			   (unsigned long *)&gdt->address);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "Failed to alloc mem for gdt\n");
		goto fail;
	}

	/*
	 * If the kernel isn't already loaded at the preferred load
	 * address, relocate it.
	 */
	if (hdr->pref_address != hdr->code32_start) {
		unsigned long bzimage_addr = hdr->code32_start;
		status = efi_relocate_kernel(sys_table, &bzimage_addr,
					     hdr->init_size, hdr->init_size,
					     hdr->pref_address,
					     hdr->kernel_alignment);
		if (status != EFI_SUCCESS) {
			efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
			goto fail;
		}

		hdr->pref_address = hdr->code32_start;
		hdr->code32_start = bzimage_addr;
	}

	status = exit_boot(boot_params, handle, is64);
	if (status != EFI_SUCCESS) {
		efi_printk(sys_table, "exit_boot() failed!\n");
		goto fail;
	}

	memset((char *)gdt->address, 0x0, gdt->size);
	desc = (struct desc_struct *)gdt->address;

	/* The first GDT is a dummy. */
	desc++;

	if (IS_ENABLED(CONFIG_X86_64)) {
		/* __KERNEL32_CS */
		desc->limit0 = 0xffff;
		desc->base0 = 0x0000;
		desc->base1 = 0x0000;
		desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
		desc->s = DESC_TYPE_CODE_DATA;
		desc->dpl = 0;
		desc->p = 1;
		desc->limit1 = 0xf;
		desc->avl = 0;
		desc->l = 0;
		desc->d = SEG_OP_SIZE_32BIT;
		desc->g = SEG_GRANULARITY_4KB;
		desc->base2 = 0x00;
		desc++;
	} else {
		/* Second entry is unused on 32-bit */
		desc++;
	}

	/* __KERNEL_CS */
	desc->limit0 = 0xffff;
	desc->base0 = 0x0000;
	desc->base1 = 0x0000;
	desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
	desc->s = DESC_TYPE_CODE_DATA;
	desc->dpl = 0;
	desc->p = 1;
	desc->limit1 = 0xf;
	desc->avl = 0;
	if (IS_ENABLED(CONFIG_X86_64)) {
		desc->l = 1;
		desc->d = 0;
	} else {
		desc->l = 0;
		desc->d = SEG_OP_SIZE_32BIT;
	}
	desc->g = SEG_GRANULARITY_4KB;
	desc->base2 = 0x00;
	desc++;

	/* __KERNEL_DS */
	desc->limit0 = 0xffff;
	desc->base0 = 0x0000;
	desc->base1 = 0x0000;
	desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
	desc->s = DESC_TYPE_CODE_DATA;
	desc->dpl = 0;
	desc->p = 1;
	desc->limit1 = 0xf;
	desc->avl = 0;
	desc->l = 0;
	desc->d = SEG_OP_SIZE_32BIT;
	desc->g = SEG_GRANULARITY_4KB;
	desc->base2 = 0x00;
	desc++;

	if (IS_ENABLED(CONFIG_X86_64)) {
		/* Task segment value */
		desc->limit0 = 0x0000;
		desc->base0 = 0x0000;
		desc->base1 = 0x0000;
		desc->type = SEG_TYPE_TSS;
		desc->s = 0;
		desc->dpl = 0;
		desc->p = 1;
		desc->limit1 = 0x0;
		desc->avl = 0;
		desc->l = 0;
		desc->d = 0;
		desc->g = SEG_GRANULARITY_4KB;
		desc->base2 = 0x00;
		desc++;
	}

	asm volatile("cli");
	asm volatile ("lgdt %0" : : "m" (*gdt));

	return boot_params;
fail:
	efi_printk(sys_table, "efi_main() failed!\n");
	return NULL;
}