1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /* -----------------------------------------------------------------------
4 *
5 * Copyright 2011 Intel Corporation; author Matt Fleming
6 *
7 * ----------------------------------------------------------------------- */
8
9 #include <linux/efi.h>
10 #include <linux/pci.h>
11
12 #include <asm/efi.h>
13 #include <asm/e820/types.h>
14 #include <asm/setup.h>
15 #include <asm/desc.h>
16 #include <asm/boot.h>
17
18 #include "../string.h"
19 #include "eboot.h"
20
21 static efi_system_table_t *sys_table;
22
23 static struct efi_config *efi_early;
24
__efi_early(void)25 __pure const struct efi_config *__efi_early(void)
26 {
27 return efi_early;
28 }
29
30 #define BOOT_SERVICES(bits) \
31 static 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 }
41 BOOT_SERVICES(32);
42 BOOT_SERVICES(64);
43
efi_char16_printk(efi_system_table_t * table,efi_char16_t * str)44 void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
45 {
46 efi_call_proto(efi_simple_text_output_protocol, output_string,
47 efi_early->text_output, str);
48 }
49
50 static efi_status_t
preserve_pci_rom_image(efi_pci_io_protocol_t * pci,struct pci_setup_rom ** __rom)51 preserve_pci_rom_image(efi_pci_io_protocol_t *pci, struct pci_setup_rom **__rom)
52 {
53 struct pci_setup_rom *rom = NULL;
54 efi_status_t status;
55 unsigned long size;
56 uint64_t romsize;
57 void *romimage;
58
59 /*
60 * Some firmware images contain EFI function pointers at the place where
61 * the romimage and romsize fields are supposed to be. Typically the EFI
62 * code is mapped at high addresses, translating to an unrealistically
63 * large romsize. The UEFI spec limits the size of option ROMs to 16
64 * MiB so we reject any ROMs over 16 MiB in size to catch this.
65 */
66 romimage = (void *)(unsigned long)efi_table_attr(efi_pci_io_protocol,
67 romimage, pci);
68 romsize = efi_table_attr(efi_pci_io_protocol, romsize, pci);
69 if (!romimage || !romsize || romsize > SZ_16M)
70 return EFI_INVALID_PARAMETER;
71
72 size = romsize + sizeof(*rom);
73
74 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
75 if (status != EFI_SUCCESS) {
76 efi_printk(sys_table, "Failed to allocate memory for 'rom'\n");
77 return status;
78 }
79
80 memset(rom, 0, sizeof(*rom));
81
82 rom->data.type = SETUP_PCI;
83 rom->data.len = size - sizeof(struct setup_data);
84 rom->data.next = 0;
85 rom->pcilen = pci->romsize;
86 *__rom = rom;
87
88 status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
89 EfiPciIoWidthUint16, PCI_VENDOR_ID, 1,
90 &rom->vendor);
91
92 if (status != EFI_SUCCESS) {
93 efi_printk(sys_table, "Failed to read rom->vendor\n");
94 goto free_struct;
95 }
96
97 status = efi_call_proto(efi_pci_io_protocol, pci.read, pci,
98 EfiPciIoWidthUint16, PCI_DEVICE_ID, 1,
99 &rom->devid);
100
101 if (status != EFI_SUCCESS) {
102 efi_printk(sys_table, "Failed to read rom->devid\n");
103 goto free_struct;
104 }
105
106 status = efi_call_proto(efi_pci_io_protocol, get_location, pci,
107 &rom->segment, &rom->bus, &rom->device,
108 &rom->function);
109
110 if (status != EFI_SUCCESS)
111 goto free_struct;
112
113 memcpy(rom->romdata, romimage, romsize);
114 return status;
115
116 free_struct:
117 efi_call_early(free_pool, rom);
118 return status;
119 }
120
121 /*
122 * There's no way to return an informative status from this function,
123 * because any analysis (and printing of error messages) needs to be
124 * done directly at the EFI function call-site.
125 *
126 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
127 * just didn't find any PCI devices, but there's no way to tell outside
128 * the context of the call.
129 */
setup_efi_pci(struct boot_params * params)130 static void setup_efi_pci(struct boot_params *params)
131 {
132 efi_status_t status;
133 void **pci_handle = NULL;
134 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
135 unsigned long size = 0;
136 unsigned long nr_pci;
137 struct setup_data *data;
138 int i;
139
140 status = efi_call_early(locate_handle,
141 EFI_LOCATE_BY_PROTOCOL,
142 &pci_proto, NULL, &size, pci_handle);
143
144 if (status == EFI_BUFFER_TOO_SMALL) {
145 status = efi_call_early(allocate_pool,
146 EFI_LOADER_DATA,
147 size, (void **)&pci_handle);
148
149 if (status != EFI_SUCCESS) {
150 efi_printk(sys_table, "Failed to allocate memory for 'pci_handle'\n");
151 return;
152 }
153
154 status = efi_call_early(locate_handle,
155 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
156 NULL, &size, pci_handle);
157 }
158
159 if (status != EFI_SUCCESS)
160 goto free_handle;
161
162 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
163
164 while (data && data->next)
165 data = (struct setup_data *)(unsigned long)data->next;
166
167 nr_pci = size / (efi_is_64bit() ? sizeof(u64) : sizeof(u32));
168 for (i = 0; i < nr_pci; i++) {
169 efi_pci_io_protocol_t *pci = NULL;
170 struct pci_setup_rom *rom;
171
172 status = efi_call_early(handle_protocol,
173 efi_is_64bit() ? ((u64 *)pci_handle)[i]
174 : ((u32 *)pci_handle)[i],
175 &pci_proto, (void **)&pci);
176 if (status != EFI_SUCCESS || !pci)
177 continue;
178
179 status = preserve_pci_rom_image(pci, &rom);
180 if (status != EFI_SUCCESS)
181 continue;
182
183 if (data)
184 data->next = (unsigned long)rom;
185 else
186 params->hdr.setup_data = (unsigned long)rom;
187
188 data = (struct setup_data *)rom;
189 }
190
191 free_handle:
192 efi_call_early(free_pool, pci_handle);
193 }
194
retrieve_apple_device_properties(struct boot_params * boot_params)195 static void retrieve_apple_device_properties(struct boot_params *boot_params)
196 {
197 efi_guid_t guid = APPLE_PROPERTIES_PROTOCOL_GUID;
198 struct setup_data *data, *new;
199 efi_status_t status;
200 u32 size = 0;
201 void *p;
202
203 status = efi_call_early(locate_protocol, &guid, NULL, &p);
204 if (status != EFI_SUCCESS)
205 return;
206
207 if (efi_table_attr(apple_properties_protocol, version, p) != 0x10000) {
208 efi_printk(sys_table, "Unsupported properties proto version\n");
209 return;
210 }
211
212 efi_call_proto(apple_properties_protocol, get_all, p, NULL, &size);
213 if (!size)
214 return;
215
216 do {
217 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
218 size + sizeof(struct setup_data), &new);
219 if (status != EFI_SUCCESS) {
220 efi_printk(sys_table, "Failed to allocate memory for 'properties'\n");
221 return;
222 }
223
224 status = efi_call_proto(apple_properties_protocol, get_all, p,
225 new->data, &size);
226
227 if (status == EFI_BUFFER_TOO_SMALL)
228 efi_call_early(free_pool, new);
229 } while (status == EFI_BUFFER_TOO_SMALL);
230
231 new->type = SETUP_APPLE_PROPERTIES;
232 new->len = size;
233 new->next = 0;
234
235 data = (struct setup_data *)(unsigned long)boot_params->hdr.setup_data;
236 if (!data) {
237 boot_params->hdr.setup_data = (unsigned long)new;
238 } else {
239 while (data->next)
240 data = (struct setup_data *)(unsigned long)data->next;
241 data->next = (unsigned long)new;
242 }
243 }
244
245 static const efi_char16_t apple[] = L"Apple";
246
setup_quirks(struct boot_params * boot_params)247 static void setup_quirks(struct boot_params *boot_params)
248 {
249 efi_char16_t *fw_vendor = (efi_char16_t *)(unsigned long)
250 efi_table_attr(efi_system_table, fw_vendor, sys_table);
251
252 if (!memcmp(fw_vendor, apple, sizeof(apple))) {
253 if (IS_ENABLED(CONFIG_APPLE_PROPERTIES))
254 retrieve_apple_device_properties(boot_params);
255 }
256 }
257
258 /*
259 * See if we have Universal Graphics Adapter (UGA) protocol
260 */
261 static efi_status_t
setup_uga(struct screen_info * si,efi_guid_t * uga_proto,unsigned long size)262 setup_uga(struct screen_info *si, efi_guid_t *uga_proto, unsigned long size)
263 {
264 efi_status_t status;
265 u32 width, height;
266 void **uga_handle = NULL;
267 efi_uga_draw_protocol_t *uga = NULL, *first_uga;
268 unsigned long nr_ugas;
269 int i;
270
271 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
272 size, (void **)&uga_handle);
273 if (status != EFI_SUCCESS)
274 return status;
275
276 status = efi_call_early(locate_handle,
277 EFI_LOCATE_BY_PROTOCOL,
278 uga_proto, NULL, &size, uga_handle);
279 if (status != EFI_SUCCESS)
280 goto free_handle;
281
282 height = 0;
283 width = 0;
284
285 first_uga = NULL;
286 nr_ugas = size / (efi_is_64bit() ? sizeof(u64) : sizeof(u32));
287 for (i = 0; i < nr_ugas; i++) {
288 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
289 u32 w, h, depth, refresh;
290 void *pciio;
291 unsigned long handle = efi_is_64bit() ? ((u64 *)uga_handle)[i]
292 : ((u32 *)uga_handle)[i];
293
294 status = efi_call_early(handle_protocol, handle,
295 uga_proto, (void **)&uga);
296 if (status != EFI_SUCCESS)
297 continue;
298
299 pciio = NULL;
300 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
301
302 status = efi_call_proto(efi_uga_draw_protocol, get_mode, uga,
303 &w, &h, &depth, &refresh);
304 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
305 width = w;
306 height = h;
307
308 /*
309 * Once we've found a UGA supporting PCIIO,
310 * don't bother looking any further.
311 */
312 if (pciio)
313 break;
314
315 first_uga = uga;
316 }
317 }
318
319 if (!width && !height)
320 goto free_handle;
321
322 /* EFI framebuffer */
323 si->orig_video_isVGA = VIDEO_TYPE_EFI;
324
325 si->lfb_depth = 32;
326 si->lfb_width = width;
327 si->lfb_height = height;
328
329 si->red_size = 8;
330 si->red_pos = 16;
331 si->green_size = 8;
332 si->green_pos = 8;
333 si->blue_size = 8;
334 si->blue_pos = 0;
335 si->rsvd_size = 8;
336 si->rsvd_pos = 24;
337
338 free_handle:
339 efi_call_early(free_pool, uga_handle);
340
341 return status;
342 }
343
setup_graphics(struct boot_params * boot_params)344 void setup_graphics(struct boot_params *boot_params)
345 {
346 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
347 struct screen_info *si;
348 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
349 efi_status_t status;
350 unsigned long size;
351 void **gop_handle = NULL;
352 void **uga_handle = NULL;
353
354 si = &boot_params->screen_info;
355 memset(si, 0, sizeof(*si));
356
357 size = 0;
358 status = efi_call_early(locate_handle,
359 EFI_LOCATE_BY_PROTOCOL,
360 &graphics_proto, NULL, &size, gop_handle);
361 if (status == EFI_BUFFER_TOO_SMALL)
362 status = efi_setup_gop(NULL, si, &graphics_proto, size);
363
364 if (status != EFI_SUCCESS) {
365 size = 0;
366 status = efi_call_early(locate_handle,
367 EFI_LOCATE_BY_PROTOCOL,
368 &uga_proto, NULL, &size, uga_handle);
369 if (status == EFI_BUFFER_TOO_SMALL)
370 setup_uga(si, &uga_proto, size);
371 }
372 }
373
374 /*
375 * Because the x86 boot code expects to be passed a boot_params we
376 * need to create one ourselves (usually the bootloader would create
377 * one for us).
378 *
379 * The caller is responsible for filling out ->code32_start in the
380 * returned boot_params.
381 */
make_boot_params(struct efi_config * c)382 struct boot_params *make_boot_params(struct efi_config *c)
383 {
384 struct boot_params *boot_params;
385 struct apm_bios_info *bi;
386 struct setup_header *hdr;
387 efi_loaded_image_t *image;
388 void *handle;
389 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
390 int options_size = 0;
391 efi_status_t status;
392 char *cmdline_ptr;
393 unsigned long ramdisk_addr;
394 unsigned long ramdisk_size;
395
396 efi_early = c;
397 sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
398 handle = (void *)(unsigned long)efi_early->image_handle;
399
400 /* Check if we were booted by the EFI firmware */
401 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
402 return NULL;
403
404 if (efi_is_64bit())
405 setup_boot_services64(efi_early);
406 else
407 setup_boot_services32(efi_early);
408
409 status = efi_call_early(handle_protocol, handle,
410 &proto, (void *)&image);
411 if (status != EFI_SUCCESS) {
412 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
413 return NULL;
414 }
415
416 status = efi_low_alloc(sys_table, 0x4000, 1,
417 (unsigned long *)&boot_params);
418 if (status != EFI_SUCCESS) {
419 efi_printk(sys_table, "Failed to allocate lowmem for boot params\n");
420 return NULL;
421 }
422
423 memset(boot_params, 0x0, 0x4000);
424
425 hdr = &boot_params->hdr;
426 bi = &boot_params->apm_bios_info;
427
428 /* Copy the second sector to boot_params */
429 memcpy(&hdr->jump, image->image_base + 512, 512);
430
431 /*
432 * Fill out some of the header fields ourselves because the
433 * EFI firmware loader doesn't load the first sector.
434 */
435 hdr->root_flags = 1;
436 hdr->vid_mode = 0xffff;
437 hdr->boot_flag = 0xAA55;
438
439 hdr->type_of_loader = 0x21;
440
441 /* Convert unicode cmdline to ascii */
442 cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
443 if (!cmdline_ptr)
444 goto fail;
445
446 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
447 /* Fill in upper bits of command line address, NOP on 32 bit */
448 boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
449
450 hdr->ramdisk_image = 0;
451 hdr->ramdisk_size = 0;
452
453 /* Clear APM BIOS info */
454 memset(bi, 0, sizeof(*bi));
455
456 status = efi_parse_options(cmdline_ptr);
457 if (status != EFI_SUCCESS)
458 goto fail2;
459
460 status = handle_cmdline_files(sys_table, image,
461 (char *)(unsigned long)hdr->cmd_line_ptr,
462 "initrd=", hdr->initrd_addr_max,
463 &ramdisk_addr, &ramdisk_size);
464
465 if (status != EFI_SUCCESS &&
466 hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
467 efi_printk(sys_table, "Trying to load files to higher address\n");
468 status = handle_cmdline_files(sys_table, image,
469 (char *)(unsigned long)hdr->cmd_line_ptr,
470 "initrd=", -1UL,
471 &ramdisk_addr, &ramdisk_size);
472 }
473
474 if (status != EFI_SUCCESS)
475 goto fail2;
476 hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
477 hdr->ramdisk_size = ramdisk_size & 0xffffffff;
478 boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
479 boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
480
481 return boot_params;
482
483 fail2:
484 efi_free(sys_table, options_size, hdr->cmd_line_ptr);
485 fail:
486 efi_free(sys_table, 0x4000, (unsigned long)boot_params);
487
488 return NULL;
489 }
490
add_e820ext(struct boot_params * params,struct setup_data * e820ext,u32 nr_entries)491 static void add_e820ext(struct boot_params *params,
492 struct setup_data *e820ext, u32 nr_entries)
493 {
494 struct setup_data *data;
495
496 e820ext->type = SETUP_E820_EXT;
497 e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
498 e820ext->next = 0;
499
500 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
501
502 while (data && data->next)
503 data = (struct setup_data *)(unsigned long)data->next;
504
505 if (data)
506 data->next = (unsigned long)e820ext;
507 else
508 params->hdr.setup_data = (unsigned long)e820ext;
509 }
510
511 static efi_status_t
setup_e820(struct boot_params * params,struct setup_data * e820ext,u32 e820ext_size)512 setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
513 {
514 struct boot_e820_entry *entry = params->e820_table;
515 struct efi_info *efi = ¶ms->efi_info;
516 struct boot_e820_entry *prev = NULL;
517 u32 nr_entries;
518 u32 nr_desc;
519 int i;
520
521 nr_entries = 0;
522 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
523
524 for (i = 0; i < nr_desc; i++) {
525 efi_memory_desc_t *d;
526 unsigned int e820_type = 0;
527 unsigned long m = efi->efi_memmap;
528
529 #ifdef CONFIG_X86_64
530 m |= (u64)efi->efi_memmap_hi << 32;
531 #endif
532
533 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
534 switch (d->type) {
535 case EFI_RESERVED_TYPE:
536 case EFI_RUNTIME_SERVICES_CODE:
537 case EFI_RUNTIME_SERVICES_DATA:
538 case EFI_MEMORY_MAPPED_IO:
539 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
540 case EFI_PAL_CODE:
541 e820_type = E820_TYPE_RESERVED;
542 break;
543
544 case EFI_UNUSABLE_MEMORY:
545 e820_type = E820_TYPE_UNUSABLE;
546 break;
547
548 case EFI_ACPI_RECLAIM_MEMORY:
549 e820_type = E820_TYPE_ACPI;
550 break;
551
552 case EFI_LOADER_CODE:
553 case EFI_LOADER_DATA:
554 case EFI_BOOT_SERVICES_CODE:
555 case EFI_BOOT_SERVICES_DATA:
556 case EFI_CONVENTIONAL_MEMORY:
557 e820_type = E820_TYPE_RAM;
558 break;
559
560 case EFI_ACPI_MEMORY_NVS:
561 e820_type = E820_TYPE_NVS;
562 break;
563
564 case EFI_PERSISTENT_MEMORY:
565 e820_type = E820_TYPE_PMEM;
566 break;
567
568 default:
569 continue;
570 }
571
572 /* Merge adjacent mappings */
573 if (prev && prev->type == e820_type &&
574 (prev->addr + prev->size) == d->phys_addr) {
575 prev->size += d->num_pages << 12;
576 continue;
577 }
578
579 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
580 u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
581 sizeof(struct setup_data);
582
583 if (!e820ext || e820ext_size < need)
584 return EFI_BUFFER_TOO_SMALL;
585
586 /* boot_params map full, switch to e820 extended */
587 entry = (struct boot_e820_entry *)e820ext->data;
588 }
589
590 entry->addr = d->phys_addr;
591 entry->size = d->num_pages << PAGE_SHIFT;
592 entry->type = e820_type;
593 prev = entry++;
594 nr_entries++;
595 }
596
597 if (nr_entries > ARRAY_SIZE(params->e820_table)) {
598 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
599
600 add_e820ext(params, e820ext, nr_e820ext);
601 nr_entries -= nr_e820ext;
602 }
603
604 params->e820_entries = (u8)nr_entries;
605
606 return EFI_SUCCESS;
607 }
608
alloc_e820ext(u32 nr_desc,struct setup_data ** e820ext,u32 * e820ext_size)609 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
610 u32 *e820ext_size)
611 {
612 efi_status_t status;
613 unsigned long size;
614
615 size = sizeof(struct setup_data) +
616 sizeof(struct e820_entry) * nr_desc;
617
618 if (*e820ext) {
619 efi_call_early(free_pool, *e820ext);
620 *e820ext = NULL;
621 *e820ext_size = 0;
622 }
623
624 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
625 size, (void **)e820ext);
626 if (status == EFI_SUCCESS)
627 *e820ext_size = size;
628
629 return status;
630 }
631
allocate_e820(struct boot_params * params,struct setup_data ** e820ext,u32 * e820ext_size)632 static efi_status_t allocate_e820(struct boot_params *params,
633 struct setup_data **e820ext,
634 u32 *e820ext_size)
635 {
636 unsigned long map_size, desc_size, buff_size;
637 struct efi_boot_memmap boot_map;
638 efi_memory_desc_t *map;
639 efi_status_t status;
640 __u32 nr_desc;
641
642 boot_map.map = ↦
643 boot_map.map_size = &map_size;
644 boot_map.desc_size = &desc_size;
645 boot_map.desc_ver = NULL;
646 boot_map.key_ptr = NULL;
647 boot_map.buff_size = &buff_size;
648
649 status = efi_get_memory_map(sys_table, &boot_map);
650 if (status != EFI_SUCCESS)
651 return status;
652
653 nr_desc = buff_size / desc_size;
654
655 if (nr_desc > ARRAY_SIZE(params->e820_table)) {
656 u32 nr_e820ext = nr_desc - ARRAY_SIZE(params->e820_table);
657
658 status = alloc_e820ext(nr_e820ext, e820ext, e820ext_size);
659 if (status != EFI_SUCCESS)
660 return status;
661 }
662
663 return EFI_SUCCESS;
664 }
665
666 struct exit_boot_struct {
667 struct boot_params *boot_params;
668 struct efi_info *efi;
669 };
670
exit_boot_func(efi_system_table_t * sys_table_arg,struct efi_boot_memmap * map,void * priv)671 static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
672 struct efi_boot_memmap *map,
673 void *priv)
674 {
675 const char *signature;
676 struct exit_boot_struct *p = priv;
677
678 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
679 : EFI32_LOADER_SIGNATURE;
680 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
681
682 p->efi->efi_systab = (unsigned long)sys_table_arg;
683 p->efi->efi_memdesc_size = *map->desc_size;
684 p->efi->efi_memdesc_version = *map->desc_ver;
685 p->efi->efi_memmap = (unsigned long)*map->map;
686 p->efi->efi_memmap_size = *map->map_size;
687
688 #ifdef CONFIG_X86_64
689 p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
690 p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
691 #endif
692
693 return EFI_SUCCESS;
694 }
695
exit_boot(struct boot_params * boot_params,void * handle)696 static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
697 {
698 unsigned long map_sz, key, desc_size, buff_size;
699 efi_memory_desc_t *mem_map;
700 struct setup_data *e820ext = NULL;
701 __u32 e820ext_size = 0;
702 efi_status_t status;
703 __u32 desc_version;
704 struct efi_boot_memmap map;
705 struct exit_boot_struct priv;
706
707 map.map = &mem_map;
708 map.map_size = &map_sz;
709 map.desc_size = &desc_size;
710 map.desc_ver = &desc_version;
711 map.key_ptr = &key;
712 map.buff_size = &buff_size;
713 priv.boot_params = boot_params;
714 priv.efi = &boot_params->efi_info;
715
716 status = allocate_e820(boot_params, &e820ext, &e820ext_size);
717 if (status != EFI_SUCCESS)
718 return status;
719
720 /* Might as well exit boot services now */
721 status = efi_exit_boot_services(sys_table, handle, &map, &priv,
722 exit_boot_func);
723 if (status != EFI_SUCCESS)
724 return status;
725
726 /* Historic? */
727 boot_params->alt_mem_k = 32 * 1024;
728
729 status = setup_e820(boot_params, e820ext, e820ext_size);
730 if (status != EFI_SUCCESS)
731 return status;
732
733 return EFI_SUCCESS;
734 }
735
736 /*
737 * On success we return a pointer to a boot_params structure, and NULL
738 * on failure.
739 */
740 struct boot_params *
efi_main(struct efi_config * c,struct boot_params * boot_params)741 efi_main(struct efi_config *c, struct boot_params *boot_params)
742 {
743 struct desc_ptr *gdt = NULL;
744 struct setup_header *hdr = &boot_params->hdr;
745 efi_status_t status;
746 struct desc_struct *desc;
747 void *handle;
748 efi_system_table_t *_table;
749 unsigned long cmdline_paddr;
750
751 efi_early = c;
752
753 _table = (efi_system_table_t *)(unsigned long)efi_early->table;
754 handle = (void *)(unsigned long)efi_early->image_handle;
755
756 sys_table = _table;
757
758 /* Check if we were booted by the EFI firmware */
759 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
760 goto fail;
761
762 if (efi_is_64bit())
763 setup_boot_services64(efi_early);
764 else
765 setup_boot_services32(efi_early);
766
767 /*
768 * make_boot_params() may have been called before efi_main(), in which
769 * case this is the second time we parse the cmdline. This is ok,
770 * parsing the cmdline multiple times does not have side-effects.
771 */
772 cmdline_paddr = ((u64)hdr->cmd_line_ptr |
773 ((u64)boot_params->ext_cmd_line_ptr << 32));
774 efi_parse_options((char *)cmdline_paddr);
775
776 /*
777 * If the boot loader gave us a value for secure_boot then we use that,
778 * otherwise we ask the BIOS.
779 */
780 if (boot_params->secure_boot == efi_secureboot_mode_unset)
781 boot_params->secure_boot = efi_get_secureboot(sys_table);
782
783 /* Ask the firmware to clear memory on unclean shutdown */
784 efi_enable_reset_attack_mitigation(sys_table);
785 efi_retrieve_tpm2_eventlog(sys_table);
786
787 setup_graphics(boot_params);
788
789 setup_efi_pci(boot_params);
790
791 setup_quirks(boot_params);
792
793 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
794 sizeof(*gdt), (void **)&gdt);
795 if (status != EFI_SUCCESS) {
796 efi_printk(sys_table, "Failed to allocate memory for 'gdt' structure\n");
797 goto fail;
798 }
799
800 gdt->size = 0x800;
801 status = efi_low_alloc(sys_table, gdt->size, 8,
802 (unsigned long *)&gdt->address);
803 if (status != EFI_SUCCESS) {
804 efi_printk(sys_table, "Failed to allocate memory for 'gdt'\n");
805 goto fail;
806 }
807
808 /*
809 * If the kernel isn't already loaded at the preferred load
810 * address, relocate it.
811 */
812 if (hdr->pref_address != hdr->code32_start) {
813 unsigned long bzimage_addr = hdr->code32_start;
814 status = efi_relocate_kernel(sys_table, &bzimage_addr,
815 hdr->init_size, hdr->init_size,
816 hdr->pref_address,
817 hdr->kernel_alignment,
818 LOAD_PHYSICAL_ADDR);
819 if (status != EFI_SUCCESS) {
820 efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
821 goto fail;
822 }
823
824 hdr->pref_address = hdr->code32_start;
825 hdr->code32_start = bzimage_addr;
826 }
827
828 status = exit_boot(boot_params, handle);
829 if (status != EFI_SUCCESS) {
830 efi_printk(sys_table, "exit_boot() failed!\n");
831 goto fail;
832 }
833
834 memset((char *)gdt->address, 0x0, gdt->size);
835 desc = (struct desc_struct *)gdt->address;
836
837 /* The first GDT is a dummy. */
838 desc++;
839
840 if (IS_ENABLED(CONFIG_X86_64)) {
841 /* __KERNEL32_CS */
842 desc->limit0 = 0xffff;
843 desc->base0 = 0x0000;
844 desc->base1 = 0x0000;
845 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
846 desc->s = DESC_TYPE_CODE_DATA;
847 desc->dpl = 0;
848 desc->p = 1;
849 desc->limit1 = 0xf;
850 desc->avl = 0;
851 desc->l = 0;
852 desc->d = SEG_OP_SIZE_32BIT;
853 desc->g = SEG_GRANULARITY_4KB;
854 desc->base2 = 0x00;
855
856 desc++;
857 } else {
858 /* Second entry is unused on 32-bit */
859 desc++;
860 }
861
862 /* __KERNEL_CS */
863 desc->limit0 = 0xffff;
864 desc->base0 = 0x0000;
865 desc->base1 = 0x0000;
866 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
867 desc->s = DESC_TYPE_CODE_DATA;
868 desc->dpl = 0;
869 desc->p = 1;
870 desc->limit1 = 0xf;
871 desc->avl = 0;
872
873 if (IS_ENABLED(CONFIG_X86_64)) {
874 desc->l = 1;
875 desc->d = 0;
876 } else {
877 desc->l = 0;
878 desc->d = SEG_OP_SIZE_32BIT;
879 }
880 desc->g = SEG_GRANULARITY_4KB;
881 desc->base2 = 0x00;
882 desc++;
883
884 /* __KERNEL_DS */
885 desc->limit0 = 0xffff;
886 desc->base0 = 0x0000;
887 desc->base1 = 0x0000;
888 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
889 desc->s = DESC_TYPE_CODE_DATA;
890 desc->dpl = 0;
891 desc->p = 1;
892 desc->limit1 = 0xf;
893 desc->avl = 0;
894 desc->l = 0;
895 desc->d = SEG_OP_SIZE_32BIT;
896 desc->g = SEG_GRANULARITY_4KB;
897 desc->base2 = 0x00;
898 desc++;
899
900 if (IS_ENABLED(CONFIG_X86_64)) {
901 /* Task segment value */
902 desc->limit0 = 0x0000;
903 desc->base0 = 0x0000;
904 desc->base1 = 0x0000;
905 desc->type = SEG_TYPE_TSS;
906 desc->s = 0;
907 desc->dpl = 0;
908 desc->p = 1;
909 desc->limit1 = 0x0;
910 desc->avl = 0;
911 desc->l = 0;
912 desc->d = 0;
913 desc->g = SEG_GRANULARITY_4KB;
914 desc->base2 = 0x00;
915 desc++;
916 }
917
918 asm volatile("cli");
919 asm volatile ("lgdt %0" : : "m" (*gdt));
920
921 return boot_params;
922 fail:
923 efi_printk(sys_table, "efi_main() failed!\n");
924
925 return NULL;
926 }
927
