Loading...
Note: File does not exist in v6.2.
1/* -----------------------------------------------------------------------
2 *
3 * Copyright 2011 Intel Corporation; author Matt Fleming
4 *
5 * This file is part of the Linux kernel, and is made available under
6 * the terms of the GNU General Public License version 2.
7 *
8 * ----------------------------------------------------------------------- */
9
10#include <linux/efi.h>
11#include <linux/pci.h>
12
13#include <asm/efi.h>
14#include <asm/e820/types.h>
15#include <asm/setup.h>
16#include <asm/desc.h>
17
18#include "../string.h"
19#include "eboot.h"
20
21static efi_system_table_t *sys_table;
22
23static struct efi_config *efi_early;
24
25__pure const struct efi_config *__efi_early(void)
26{
27 return efi_early;
28}
29
30#define BOOT_SERVICES(bits) \
31static void setup_boot_services##bits(struct efi_config *c) \
32{ \
33 efi_system_table_##bits##_t *table; \
34 \
35 table = (typeof(table))sys_table; \
36 \
37 c->runtime_services = table->runtime; \
38 c->boot_services = table->boottime; \
39 c->text_output = table->con_out; \
40}
41BOOT_SERVICES(32);
42BOOT_SERVICES(64);
43
44static inline efi_status_t __open_volume32(void *__image, void **__fh)
45{
46 efi_file_io_interface_t *io;
47 efi_loaded_image_32_t *image = __image;
48 efi_file_handle_32_t *fh;
49 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
50 efi_status_t status;
51 void *handle = (void *)(unsigned long)image->device_handle;
52 unsigned long func;
53
54 status = efi_call_early(handle_protocol, handle,
55 &fs_proto, (void **)&io);
56 if (status != EFI_SUCCESS) {
57 efi_printk(sys_table, "Failed to handle fs_proto\n");
58 return status;
59 }
60
61 func = (unsigned long)io->open_volume;
62 status = efi_early->call(func, io, &fh);
63 if (status != EFI_SUCCESS)
64 efi_printk(sys_table, "Failed to open volume\n");
65
66 *__fh = fh;
67 return status;
68}
69
70static inline efi_status_t __open_volume64(void *__image, void **__fh)
71{
72 efi_file_io_interface_t *io;
73 efi_loaded_image_64_t *image = __image;
74 efi_file_handle_64_t *fh;
75 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
76 efi_status_t status;
77 void *handle = (void *)(unsigned long)image->device_handle;
78 unsigned long func;
79
80 status = efi_call_early(handle_protocol, handle,
81 &fs_proto, (void **)&io);
82 if (status != EFI_SUCCESS) {
83 efi_printk(sys_table, "Failed to handle fs_proto\n");
84 return status;
85 }
86
87 func = (unsigned long)io->open_volume;
88 status = efi_early->call(func, io, &fh);
89 if (status != EFI_SUCCESS)
90 efi_printk(sys_table, "Failed to open volume\n");
91
92 *__fh = fh;
93 return status;
94}
95
96efi_status_t
97efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
98{
99 if (efi_early->is64)
100 return __open_volume64(__image, __fh);
101
102 return __open_volume32(__image, __fh);
103}
104
105void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
106{
107 efi_call_proto(efi_simple_text_output_protocol, output_string,
108 efi_early->text_output, str);
109}
110
111static efi_status_t
112__setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
113{
114 struct pci_setup_rom *rom = NULL;
115 efi_status_t status;
116 unsigned long size;
117 uint64_t attributes;
118
119 status = efi_early->call(pci->attributes, pci,
120 EfiPciIoAttributeOperationGet, 0, 0,
121 &attributes);
122 if (status != EFI_SUCCESS)
123 return status;
124
125 if (!pci->romimage || !pci->romsize)
126 return EFI_INVALID_PARAMETER;
127
128 size = pci->romsize + sizeof(*rom);
129
130 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
131 if (status != EFI_SUCCESS) {
132 efi_printk(sys_table, "Failed to alloc mem for rom\n");
133 return status;
134 }
135
136 memset(rom, 0, sizeof(*rom));
137
138 rom->data.type = SETUP_PCI;
139 rom->data.len = size - sizeof(struct setup_data);
140 rom->data.next = 0;
141 rom->pcilen = pci->romsize;
142 *__rom = rom;
143
144 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
145 PCI_VENDOR_ID, 1, &(rom->vendor));
146
147 if (status != EFI_SUCCESS) {
148 efi_printk(sys_table, "Failed to read rom->vendor\n");
149 goto free_struct;
150 }
151
152 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
153 PCI_DEVICE_ID, 1, &(rom->devid));
154
155 if (status != EFI_SUCCESS) {
156 efi_printk(sys_table, "Failed to read rom->devid\n");
157 goto free_struct;
158 }
159
160 status = efi_early->call(pci->get_location, pci, &(rom->segment),
161 &(rom->bus), &(rom->device), &(rom->function));
162
163 if (status != EFI_SUCCESS)
164 goto free_struct;
165
166 memcpy(rom->romdata, (void *)(unsigned long)pci->romimage,
167 pci->romsize);
168 return status;
169
170free_struct:
171 efi_call_early(free_pool, rom);
172 return status;
173}
174
175static void
176setup_efi_pci32(struct boot_params *params, void **pci_handle,
177 unsigned long size)
178{
179 efi_pci_io_protocol_32 *pci = NULL;
180 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
181 u32 *handles = (u32 *)(unsigned long)pci_handle;
182 efi_status_t status;
183 unsigned long nr_pci;
184 struct setup_data *data;
185 int i;
186
187 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
188
189 while (data && data->next)
190 data = (struct setup_data *)(unsigned long)data->next;
191
192 nr_pci = size / sizeof(u32);
193 for (i = 0; i < nr_pci; i++) {
194 struct pci_setup_rom *rom = NULL;
195 u32 h = handles[i];
196
197 status = efi_call_early(handle_protocol, h,
198 &pci_proto, (void **)&pci);
199
200 if (status != EFI_SUCCESS)
201 continue;
202
203 if (!pci)
204 continue;
205
206 status = __setup_efi_pci32(pci, &rom);
207 if (status != EFI_SUCCESS)
208 continue;
209
210 if (data)
211 data->next = (unsigned long)rom;
212 else
213 params->hdr.setup_data = (unsigned long)rom;
214
215 data = (struct setup_data *)rom;
216
217 }
218}
219
220static efi_status_t
221__setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
222{
223 struct pci_setup_rom *rom;
224 efi_status_t status;
225 unsigned long size;
226 uint64_t attributes;
227
228 status = efi_early->call(pci->attributes, pci,
229 EfiPciIoAttributeOperationGet, 0,
230 &attributes);
231 if (status != EFI_SUCCESS)
232 return status;
233
234 if (!pci->romimage || !pci->romsize)
235 return EFI_INVALID_PARAMETER;
236
237 size = pci->romsize + sizeof(*rom);
238
239 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
240 if (status != EFI_SUCCESS) {
241 efi_printk(sys_table, "Failed to alloc mem for rom\n");
242 return status;
243 }
244
245 rom->data.type = SETUP_PCI;
246 rom->data.len = size - sizeof(struct setup_data);
247 rom->data.next = 0;
248 rom->pcilen = pci->romsize;
249 *__rom = rom;
250
251 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
252 PCI_VENDOR_ID, 1, &(rom->vendor));
253
254 if (status != EFI_SUCCESS) {
255 efi_printk(sys_table, "Failed to read rom->vendor\n");
256 goto free_struct;
257 }
258
259 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
260 PCI_DEVICE_ID, 1, &(rom->devid));
261
262 if (status != EFI_SUCCESS) {
263 efi_printk(sys_table, "Failed to read rom->devid\n");
264 goto free_struct;
265 }
266
267 status = efi_early->call(pci->get_location, pci, &(rom->segment),
268 &(rom->bus), &(rom->device), &(rom->function));
269
270 if (status != EFI_SUCCESS)
271 goto free_struct;
272
273 memcpy(rom->romdata, (void *)(unsigned long)pci->romimage,
274 pci->romsize);
275 return status;
276
277free_struct:
278 efi_call_early(free_pool, rom);
279 return status;
280
281}
282
283static void
284setup_efi_pci64(struct boot_params *params, void **pci_handle,
285 unsigned long size)
286{
287 efi_pci_io_protocol_64 *pci = NULL;
288 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
289 u64 *handles = (u64 *)(unsigned long)pci_handle;
290 efi_status_t status;
291 unsigned long nr_pci;
292 struct setup_data *data;
293 int i;
294
295 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
296
297 while (data && data->next)
298 data = (struct setup_data *)(unsigned long)data->next;
299
300 nr_pci = size / sizeof(u64);
301 for (i = 0; i < nr_pci; i++) {
302 struct pci_setup_rom *rom = NULL;
303 u64 h = handles[i];
304
305 status = efi_call_early(handle_protocol, h,
306 &pci_proto, (void **)&pci);
307
308 if (status != EFI_SUCCESS)
309 continue;
310
311 if (!pci)
312 continue;
313
314 status = __setup_efi_pci64(pci, &rom);
315 if (status != EFI_SUCCESS)
316 continue;
317
318 if (data)
319 data->next = (unsigned long)rom;
320 else
321 params->hdr.setup_data = (unsigned long)rom;
322
323 data = (struct setup_data *)rom;
324
325 }
326}
327
328/*
329 * There's no way to return an informative status from this function,
330 * because any analysis (and printing of error messages) needs to be
331 * done directly at the EFI function call-site.
332 *
333 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
334 * just didn't find any PCI devices, but there's no way to tell outside
335 * the context of the call.
336 */
337static void setup_efi_pci(struct boot_params *params)
338{
339 efi_status_t status;
340 void **pci_handle = NULL;
341 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
342 unsigned long size = 0;
343
344 status = efi_call_early(locate_handle,
345 EFI_LOCATE_BY_PROTOCOL,
346 &pci_proto, NULL, &size, pci_handle);
347
348 if (status == EFI_BUFFER_TOO_SMALL) {
349 status = efi_call_early(allocate_pool,
350 EFI_LOADER_DATA,
351 size, (void **)&pci_handle);
352
353 if (status != EFI_SUCCESS) {
354 efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
355 return;
356 }
357
358 status = efi_call_early(locate_handle,
359 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
360 NULL, &size, pci_handle);
361 }
362
363 if (status != EFI_SUCCESS)
364 goto free_handle;
365
366 if (efi_early->is64)
367 setup_efi_pci64(params, pci_handle, size);
368 else
369 setup_efi_pci32(params, pci_handle, size);
370
371free_handle:
372 efi_call_early(free_pool, pci_handle);
373}
374
375static void retrieve_apple_device_properties(struct boot_params *boot_params)
376{
377 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
378 struct setup_data *data, *new;
379 efi_status_t status;
380 u32 size = 0;
381 void *p;
382
383 status = efi_call_early(locate_protocol, &guid, NULL, &p);
384 if (status != EFI_SUCCESS)
385 return;
386
387 if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
388 efi_printk(sys_table, "Unsupported properties proto version\n");
389 return;
390 }
391
392 efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
393 if (!size)
394 return;
395
396 do {
397 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
398 size + sizeof(struct setup_data), &new);
399 if (status != EFI_SUCCESS) {
400 efi_printk(sys_table,
401 "Failed to alloc mem for properties\n");
402 return;
403 }
404
405 status = efi_call_proto(apple_properties_protocol, get_all, p,
406 new->data, &size);
407
408 if (status == EFI_BUFFER_TOO_SMALL)
409 efi_call_early(free_pool, new);
410 } while (status == EFI_BUFFER_TOO_SMALL);
411
412 new->type = SETUP_APPLE_PROPERTIES;
413 new->len = size;
414 new->next = 0;
415
416 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
417 if (!data)
418 boot_params->hdr.setup_data = (unsigned long)new;
419 else {
420 while (data->next)
421 data = (struct setup_data *)(unsigned long)data->next;
422 data->next = (unsigned long)new;
423 }
424}
425
426static const efi_char16_t apple[] = L"Apple";
427
428static void setup_quirks(struct boot_params *boot_params)
429{
430 efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
431 efi_table_attr(efi_system_table, fw_vendor, sys_table);
432
433 if (!memcmp(fw_vendor, apple, sizeof(apple))) {
434 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
435 retrieve_apple_device_properties(boot_params);
436 }
437}
438
439static efi_status_t
440setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
441{
442 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
443 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
444 unsigned long nr_ugas;
445 u32 *handles = (u32 *)uga_handle;
446 efi_status_t status = EFI_INVALID_PARAMETER;
447 int i;
448
449 first_uga = NULL;
450 nr_ugas = size / sizeof(u32);
451 for (i = 0; i < nr_ugas; i++) {
452 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
453 u32 w, h, depth, refresh;
454 void *pciio;
455 u32 handle = handles[i];
456
457 status = efi_call_early(handle_protocol, handle,
458 &uga_proto, (void **)&uga);
459 if (status != EFI_SUCCESS)
460 continue;
461
462 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
463
464 status = efi_early->call((unsigned long)uga->get_mode, uga,
465 &w, &h, &depth, &refresh);
466 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
467 *width = w;
468 *height = h;
469
470 /*
471 * Once we've found a UGA supporting PCIIO,
472 * don't bother looking any further.
473 */
474 if (pciio)
475 break;
476
477 first_uga = uga;
478 }
479 }
480
481 return status;
482}
483
484static efi_status_t
485setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
486{
487 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
488 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
489 unsigned long nr_ugas;
490 u64 *handles = (u64 *)uga_handle;
491 efi_status_t status = EFI_INVALID_PARAMETER;
492 int i;
493
494 first_uga = NULL;
495 nr_ugas = size / sizeof(u64);
496 for (i = 0; i < nr_ugas; i++) {
497 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
498 u32 w, h, depth, refresh;
499 void *pciio;
500 u64 handle = handles[i];
501
502 status = efi_call_early(handle_protocol, handle,
503 &uga_proto, (void **)&uga);
504 if (status != EFI_SUCCESS)
505 continue;
506
507 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
508
509 status = efi_early->call((unsigned long)uga->get_mode, uga,
510 &w, &h, &depth, &refresh);
511 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
512 *width = w;
513 *height = h;
514
515 /*
516 * Once we've found a UGA supporting PCIIO,
517 * don't bother looking any further.
518 */
519 if (pciio)
520 break;
521
522 first_uga = uga;
523 }
524 }
525
526 return status;
527}
528
529/*
530 * See if we have Universal Graphics Adapter (UGA) protocol
531 */
532static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
533 unsigned long size)
534{
535 efi_status_t status;
536 u32 width, height;
537 void **uga_handle = NULL;
538
539 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
540 size, (void **)&uga_handle);
541 if (status != EFI_SUCCESS)
542 return status;
543
544 status = efi_call_early(locate_handle,
545 EFI_LOCATE_BY_PROTOCOL,
546 uga_proto, NULL, &size, uga_handle);
547 if (status != EFI_SUCCESS)
548 goto free_handle;
549
550 height = 0;
551 width = 0;
552
553 if (efi_early->is64)
554 status = setup_uga64(uga_handle, size, &width, &height);
555 else
556 status = setup_uga32(uga_handle, size, &width, &height);
557
558 if (!width && !height)
559 goto free_handle;
560
561 /* EFI framebuffer */
562 si->orig_video_isVGA = VIDEO_TYPE_EFI;
563
564 si->lfb_depth = 32;
565 si->lfb_width = width;
566 si->lfb_height = height;
567
568 si->red_size = 8;
569 si->red_pos = 16;
570 si->green_size = 8;
571 si->green_pos = 8;
572 si->blue_size = 8;
573 si->blue_pos = 0;
574 si->rsvd_size = 8;
575 si->rsvd_pos = 24;
576
577free_handle:
578 efi_call_early(free_pool, uga_handle);
579 return status;
580}
581
582void setup_graphics(struct boot_params *boot_params)
583{
584 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
585 struct screen_info *si;
586 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
587 efi_status_t status;
588 unsigned long size;
589 void **gop_handle = NULL;
590 void **uga_handle = NULL;
591
592 si = &boot_params->screen_info;
593 memset(si, 0, sizeof(*si));
594
595 size = 0;
596 status = efi_call_early(locate_handle,
597 EFI_LOCATE_BY_PROTOCOL,
598 &graphics_proto, NULL, &size, gop_handle);
599 if (status == EFI_BUFFER_TOO_SMALL)
600 status = efi_setup_gop(NULL, si, &graphics_proto, size);
601
602 if (status != EFI_SUCCESS) {
603 size = 0;
604 status = efi_call_early(locate_handle,
605 EFI_LOCATE_BY_PROTOCOL,
606 &uga_proto, NULL, &size, uga_handle);
607 if (status == EFI_BUFFER_TOO_SMALL)
608 setup_uga(si, &uga_proto, size);
609 }
610}
611
612/*
613 * Because the x86 boot code expects to be passed a boot_params we
614 * need to create one ourselves (usually the bootloader would create
615 * one for us).
616 *
617 * The caller is responsible for filling out ->code32_start in the
618 * returned boot_params.
619 */
620struct boot_params *make_boot_params(struct efi_config *c)
621{
622 struct boot_params *boot_params;
623 struct apm_bios_info *bi;
624 struct setup_header *hdr;
625 efi_loaded_image_t *image;
626 void *options, *handle;
627 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
628 int options_size = 0;
629 efi_status_t status;
630 char *cmdline_ptr;
631 u16 *s2;
632 u8 *s1;
633 int i;
634 unsigned long ramdisk_addr;
635 unsigned long ramdisk_size;
636
637 efi_early = c;
638 sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
639 handle = (void *)(unsigned long)efi_early->image_handle;
640
641 /* Check if we were booted by the EFI firmware */
642 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
643 return NULL;
644
645 if (efi_early->is64)
646 setup_boot_services64(efi_early);
647 else
648 setup_boot_services32(efi_early);
649
650 status = efi_call_early(handle_protocol, handle,
651 &proto, (void *)&image);
652 if (status != EFI_SUCCESS) {
653 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
654 return NULL;
655 }
656
657 status = efi_low_alloc(sys_table, 0x4000, 1,
658 (unsigned long *)&boot_params);
659 if (status != EFI_SUCCESS) {
660 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
661 return NULL;
662 }
663
664 memset(boot_params, 0x0, 0x4000);
665
666 hdr = &boot_params->hdr;
667 bi = &boot_params->apm_bios_info;
668
669 /* Copy the second sector to boot_params */
670 memcpy(&hdr->jump, image->image_base + 512, 512);
671
672 /*
673 * Fill out some of the header fields ourselves because the
674 * EFI firmware loader doesn't load the first sector.
675 */
676 hdr->root_flags = 1;
677 hdr->vid_mode = 0xffff;
678 hdr->boot_flag = 0xAA55;
679
680 hdr->type_of_loader = 0x21;
681
682 /* Convert unicode cmdline to ascii */
683 cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
684 if (!cmdline_ptr)
685 goto fail;
686 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
687 /* Fill in upper bits of command line address, NOP on 32 bit */
688 boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
689
690 hdr->ramdisk_image = 0;
691 hdr->ramdisk_size = 0;
692
693 /* Clear APM BIOS info */
694 memset(bi, 0, sizeof(*bi));
695
696 status = efi_parse_options(cmdline_ptr);
697 if (status != EFI_SUCCESS)
698 goto fail2;
699
700 status = handle_cmdline_files(sys_table, image,
701 (char *)(unsigned long)hdr->cmd_line_ptr,
702 "initrd=", hdr->initrd_addr_max,
703 &ramdisk_addr, &ramdisk_size);
704
705 if (status != EFI_SUCCESS &&
706 hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
707 efi_printk(sys_table, "Trying to load files to higher address\n");
708 status = handle_cmdline_files(sys_table, image,
709 (char *)(unsigned long)hdr->cmd_line_ptr,
710 "initrd=", -1UL,
711 &ramdisk_addr, &ramdisk_size);
712 }
713
714 if (status != EFI_SUCCESS)
715 goto fail2;
716 hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
717 hdr->ramdisk_size = ramdisk_size & 0xffffffff;
718 boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
719 boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
720
721 return boot_params;
722fail2:
723 efi_free(sys_table, options_size, hdr->cmd_line_ptr);
724fail:
725 efi_free(sys_table, 0x4000, (unsigned long)boot_params);
726 return NULL;
727}
728
729static void add_e820ext(struct boot_params *params,
730 struct setup_data *e820ext, u32 nr_entries)
731{
732 struct setup_data *data;
733 efi_status_t status;
734 unsigned long size;
735
736 e820ext->type = SETUP_E820_EXT;
737 e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
738 e820ext->next = 0;
739
740 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
741
742 while (data && data->next)
743 data = (struct setup_data *)(unsigned long)data->next;
744
745 if (data)
746 data->next = (unsigned long)e820ext;
747 else
748 params->hdr.setup_data = (unsigned long)e820ext;
749}
750
751static efi_status_t setup_e820(struct boot_params *params,
752 struct setup_data *e820ext, u32 e820ext_size)
753{
754 struct boot_e820_entry *entry = params->e820_table;
755 struct efi_info *efi = ¶ms->efi_info;
756 struct boot_e820_entry *prev = NULL;
757 u32 nr_entries;
758 u32 nr_desc;
759 int i;
760
761 nr_entries = 0;
762 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
763
764 for (i = 0; i < nr_desc; i++) {
765 efi_memory_desc_t *d;
766 unsigned int e820_type = 0;
767 unsigned long m = efi->efi_memmap;
768
769#ifdef CONFIG_X86_64
770 m |= (u64)efi->efi_memmap_hi << 32;
771#endif
772
773 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
774 switch (d->type) {
775 case EFI_RESERVED_TYPE:
776 case EFI_RUNTIME_SERVICES_CODE:
777 case EFI_RUNTIME_SERVICES_DATA:
778 case EFI_MEMORY_MAPPED_IO:
779 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
780 case EFI_PAL_CODE:
781 e820_type = E820_TYPE_RESERVED;
782 break;
783
784 case EFI_UNUSABLE_MEMORY:
785 e820_type = E820_TYPE_UNUSABLE;
786 break;
787
788 case EFI_ACPI_RECLAIM_MEMORY:
789 e820_type = E820_TYPE_ACPI;
790 break;
791
792 case EFI_LOADER_CODE:
793 case EFI_LOADER_DATA:
794 case EFI_BOOT_SERVICES_CODE:
795 case EFI_BOOT_SERVICES_DATA:
796 case EFI_CONVENTIONAL_MEMORY:
797 e820_type = E820_TYPE_RAM;
798 break;
799
800 case EFI_ACPI_MEMORY_NVS:
801 e820_type = E820_TYPE_NVS;
802 break;
803
804 case EFI_PERSISTENT_MEMORY:
805 e820_type = E820_TYPE_PMEM;
806 break;
807
808 default:
809 continue;
810 }
811
812 /* Merge adjacent mappings */
813 if (prev && prev->type == e820_type &&
814 (prev->addr + prev->size) == d->phys_addr) {
815 prev->size += d->num_pages << 12;
816 continue;
817 }
818
819 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
820 u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
821 sizeof(struct setup_data);
822
823 if (!e820ext || e820ext_size < need)
824 return EFI_BUFFER_TOO_SMALL;
825
826 /* boot_params map full, switch to e820 extended */
827 entry = (struct boot_e820_entry *)e820ext->data;
828 }
829
830 entry->addr = d->phys_addr;
831 entry->size = d->num_pages << PAGE_SHIFT;
832 entry->type = e820_type;
833 prev = entry++;
834 nr_entries++;
835 }
836
837 if (nr_entries > ARRAY_SIZE(params->e820_table)) {
838 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
839
840 add_e820ext(params, e820ext, nr_e820ext);
841 nr_entries -= nr_e820ext;
842 }
843
844 params->e820_entries = (u8)nr_entries;
845
846 return EFI_SUCCESS;
847}
848
849static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
850 u32 *e820ext_size)
851{
852 efi_status_t status;
853 unsigned long size;
854
855 size = sizeof(struct setup_data) +
856 sizeof(struct e820_entry) * nr_desc;
857
858 if (*e820ext) {
859 efi_call_early(free_pool, *e820ext);
860 *e820ext = NULL;
861 *e820ext_size = 0;
862 }
863
864 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
865 size, (void **)e820ext);
866 if (status == EFI_SUCCESS)
867 *e820ext_size = size;
868
869 return status;
870}
871
872struct exit_boot_struct {
873 struct boot_params *boot_params;
874 struct efi_info *efi;
875 struct setup_data *e820ext;
876 __u32 e820ext_size;
877 bool is64;
878};
879
880static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
881 struct efi_boot_memmap *map,
882 void *priv)
883{
884 static bool first = true;
885 const char *signature;
886 __u32 nr_desc;
887 efi_status_t status;
888 struct exit_boot_struct *p = priv;
889
890 if (first) {
891 nr_desc = *map->buff_size / *map->desc_size;
892 if (nr_desc > ARRAY_SIZE(p->boot_params->e820_table)) {
893 u32 nr_e820ext = nr_desc -
894 ARRAY_SIZE(p->boot_params->e820_table);
895
896 status = alloc_e820ext(nr_e820ext, &p->e820ext,
897 &p->e820ext_size);
898 if (status != EFI_SUCCESS)
899 return status;
900 }
901 first = false;
902 }
903
904 signature = p->is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
905 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
906
907 p->efi->efi_systab = (unsigned long)sys_table_arg;
908 p->efi->efi_memdesc_size = *map->desc_size;
909 p->efi->efi_memdesc_version = *map->desc_ver;
910 p->efi->efi_memmap = (unsigned long)*map->map;
911 p->efi->efi_memmap_size = *map->map_size;
912
913#ifdef CONFIG_X86_64
914 p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
915 p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
916#endif
917
918 return EFI_SUCCESS;
919}
920
921static efi_status_t exit_boot(struct boot_params *boot_params,
922 void *handle, bool is64)
923{
924 unsigned long map_sz, key, desc_size, buff_size;
925 efi_memory_desc_t *mem_map;
926 struct setup_data *e820ext;
927 __u32 e820ext_size;
928 efi_status_t status;
929 __u32 desc_version;
930 struct efi_boot_memmap map;
931 struct exit_boot_struct priv;
932
933 map.map = &mem_map;
934 map.map_size = &map_sz;
935 map.desc_size = &desc_size;
936 map.desc_ver = &desc_version;
937 map.key_ptr = &key;
938 map.buff_size = &buff_size;
939 priv.boot_params = boot_params;
940 priv.efi = &boot_params->efi_info;
941 priv.e820ext = NULL;
942 priv.e820ext_size = 0;
943 priv.is64 = is64;
944
945 /* Might as well exit boot services now */
946 status = efi_exit_boot_services(sys_table, handle, &map, &priv,
947 exit_boot_func);
948 if (status != EFI_SUCCESS)
949 return status;
950
951 e820ext = priv.e820ext;
952 e820ext_size = priv.e820ext_size;
953 /* Historic? */
954 boot_params->alt_mem_k = 32 * 1024;
955
956 status = setup_e820(boot_params, e820ext, e820ext_size);
957 if (status != EFI_SUCCESS)
958 return status;
959
960 return EFI_SUCCESS;
961}
962
963/*
964 * On success we return a pointer to a boot_params structure, and NULL
965 * on failure.
966 */
967struct boot_params *efi_main(struct efi_config *c,
968 struct boot_params *boot_params)
969{
970 struct desc_ptr *gdt = NULL;
971 efi_loaded_image_t *image;
972 struct setup_header *hdr = &boot_params->hdr;
973 efi_status_t status;
974 struct desc_struct *desc;
975 void *handle;
976 efi_system_table_t *_table;
977 bool is64;
978
979 efi_early = c;
980
981 _table = (efi_system_table_t *)(unsigned long)efi_early->table;
982 handle = (void *)(unsigned long)efi_early->image_handle;
983 is64 = efi_early->is64;
984
985 sys_table = _table;
986
987 /* Check if we were booted by the EFI firmware */
988 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
989 goto fail;
990
991 if (is64)
992 setup_boot_services64(efi_early);
993 else
994 setup_boot_services32(efi_early);
995
996 /*
997 * If the boot loader gave us a value for secure_boot then we use that,
998 * otherwise we ask the BIOS.
999 */
1000 if (boot_params->secure_boot == efi_secureboot_mode_unset)
1001 boot_params->secure_boot = efi_get_secureboot(sys_table);
1002
1003 /* Ask the firmware to clear memory on unclean shutdown */
1004 efi_enable_reset_attack_mitigation(sys_table);
1005 efi_retrieve_tpm2_eventlog(sys_table);
1006
1007 setup_graphics(boot_params);
1008
1009 setup_efi_pci(boot_params);
1010
1011 setup_quirks(boot_params);
1012
1013 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1014 sizeof(*gdt), (void **)&gdt);
1015 if (status != EFI_SUCCESS) {
1016 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1017 goto fail;
1018 }
1019
1020 gdt->size = 0x800;
1021 status = efi_low_alloc(sys_table, gdt->size, 8,
1022 (unsigned long *)&gdt->address);
1023 if (status != EFI_SUCCESS) {
1024 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1025 goto fail;
1026 }
1027
1028 /*
1029 * If the kernel isn't already loaded at the preferred load
1030 * address, relocate it.
1031 */
1032 if (hdr->pref_address != hdr->code32_start) {
1033 unsigned long bzimage_addr = hdr->code32_start;
1034 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1035 hdr->init_size, hdr->init_size,
1036 hdr->pref_address,
1037 hdr->kernel_alignment);
1038 if (status != EFI_SUCCESS) {
1039 efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1040 goto fail;
1041 }
1042
1043 hdr->pref_address = hdr->code32_start;
1044 hdr->code32_start = bzimage_addr;
1045 }
1046
1047 status = exit_boot(boot_params, handle, is64);
1048 if (status != EFI_SUCCESS) {
1049 efi_printk(sys_table, "exit_boot() failed!\n");
1050 goto fail;
1051 }
1052
1053 memset((char *)gdt->address, 0x0, gdt->size);
1054 desc = (struct desc_struct *)gdt->address;
1055
1056 /* The first GDT is a dummy. */
1057 desc++;
1058
1059 if (IS_ENABLED(CONFIG_X86_64)) {
1060 /* __KERNEL32_CS */
1061 desc->limit0 = 0xffff;
1062 desc->base0 = 0x0000;
1063 desc->base1 = 0x0000;
1064 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1065 desc->s = DESC_TYPE_CODE_DATA;
1066 desc->dpl = 0;
1067 desc->p = 1;
1068 desc->limit1 = 0xf;
1069 desc->avl = 0;
1070 desc->l = 0;
1071 desc->d = SEG_OP_SIZE_32BIT;
1072 desc->g = SEG_GRANULARITY_4KB;
1073 desc->base2 = 0x00;
1074 desc++;
1075 } else {
1076 /* Second entry is unused on 32-bit */
1077 desc++;
1078 }
1079
1080 /* __KERNEL_CS */
1081 desc->limit0 = 0xffff;
1082 desc->base0 = 0x0000;
1083 desc->base1 = 0x0000;
1084 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1085 desc->s = DESC_TYPE_CODE_DATA;
1086 desc->dpl = 0;
1087 desc->p = 1;
1088 desc->limit1 = 0xf;
1089 desc->avl = 0;
1090 if (IS_ENABLED(CONFIG_X86_64)) {
1091 desc->l = 1;
1092 desc->d = 0;
1093 } else {
1094 desc->l = 0;
1095 desc->d = SEG_OP_SIZE_32BIT;
1096 }
1097 desc->g = SEG_GRANULARITY_4KB;
1098 desc->base2 = 0x00;
1099 desc++;
1100
1101 /* __KERNEL_DS */
1102 desc->limit0 = 0xffff;
1103 desc->base0 = 0x0000;
1104 desc->base1 = 0x0000;
1105 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1106 desc->s = DESC_TYPE_CODE_DATA;
1107 desc->dpl = 0;
1108 desc->p = 1;
1109 desc->limit1 = 0xf;
1110 desc->avl = 0;
1111 desc->l = 0;
1112 desc->d = SEG_OP_SIZE_32BIT;
1113 desc->g = SEG_GRANULARITY_4KB;
1114 desc->base2 = 0x00;
1115 desc++;
1116
1117 if (IS_ENABLED(CONFIG_X86_64)) {
1118 /* Task segment value */
1119 desc->limit0 = 0x0000;
1120 desc->base0 = 0x0000;
1121 desc->base1 = 0x0000;
1122 desc->type = SEG_TYPE_TSS;
1123 desc->s = 0;
1124 desc->dpl = 0;
1125 desc->p = 1;
1126 desc->limit1 = 0x0;
1127 desc->avl = 0;
1128 desc->l = 0;
1129 desc->d = 0;
1130 desc->g = SEG_GRANULARITY_4KB;
1131 desc->base2 = 0x00;
1132 desc++;
1133 }
1134
1135 asm volatile("cli");
1136 asm volatile ("lgdt %0" : : "m" (*gdt));
1137
1138 return boot_params;
1139fail:
1140 efi_printk(sys_table, "efi_main() failed!\n");
1141 return NULL;
1142}