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
44void 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
50static efi_status_t
51preserve_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
116free_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 */
130static 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
191free_handle:
192 efi_call_early(free_pool, pci_handle);
193}
194
195static 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
245static const efi_char16_t apple[] = L"Apple";
246
247static 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 */
261static efi_status_t
262setup_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
338free_handle:
339 efi_call_early(free_pool, uga_handle);
340
341 return status;
342}
343
344void 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 */
382struct 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 *options, *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 u16 *s2;
394 u8 *s1;
395 int i;
396 unsigned long ramdisk_addr;
397 unsigned long ramdisk_size;
398
399 efi_early = c;
400 sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
401 handle = (void *)(unsigned long)efi_early->image_handle;
402
403 /* Check if we were booted by the EFI firmware */
404 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
405 return NULL;
406
407 if (efi_is_64bit())
408 setup_boot_services64(efi_early);
409 else
410 setup_boot_services32(efi_early);
411
412 status = efi_call_early(handle_protocol, handle,
413 &proto, (void *)&image);
414 if (status != EFI_SUCCESS) {
415 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
416 return NULL;
417 }
418
419 status = efi_low_alloc(sys_table, 0x4000, 1,
420 (unsigned long *)&boot_params);
421 if (status != EFI_SUCCESS) {
422 efi_printk(sys_table, "Failed to allocate lowmem for boot params\n");
423 return NULL;
424 }
425
426 memset(boot_params, 0x0, 0x4000);
427
428 hdr = &boot_params->hdr;
429 bi = &boot_params->apm_bios_info;
430
431 /* Copy the second sector to boot_params */
432 memcpy(&hdr->jump, image->image_base + 512, 512);
433
434 /*
435 * Fill out some of the header fields ourselves because the
436 * EFI firmware loader doesn't load the first sector.
437 */
438 hdr->root_flags = 1;
439 hdr->vid_mode = 0xffff;
440 hdr->boot_flag = 0xAA55;
441
442 hdr->type_of_loader = 0x21;
443
444 /* Convert unicode cmdline to ascii */
445 cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
446 if (!cmdline_ptr)
447 goto fail;
448
449 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
450 /* Fill in upper bits of command line address, NOP on 32 bit */
451 boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
452
453 hdr->ramdisk_image = 0;
454 hdr->ramdisk_size = 0;
455
456 /* Clear APM BIOS info */
457 memset(bi, 0, sizeof(*bi));
458
459 status = efi_parse_options(cmdline_ptr);
460 if (status != EFI_SUCCESS)
461 goto fail2;
462
463 status = handle_cmdline_files(sys_table, image,
464 (char *)(unsigned long)hdr->cmd_line_ptr,
465 "initrd=", hdr->initrd_addr_max,
466 &ramdisk_addr, &ramdisk_size);
467
468 if (status != EFI_SUCCESS &&
469 hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
470 efi_printk(sys_table, "Trying to load files to higher address\n");
471 status = handle_cmdline_files(sys_table, image,
472 (char *)(unsigned long)hdr->cmd_line_ptr,
473 "initrd=", -1UL,
474 &ramdisk_addr, &ramdisk_size);
475 }
476
477 if (status != EFI_SUCCESS)
478 goto fail2;
479 hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
480 hdr->ramdisk_size = ramdisk_size & 0xffffffff;
481 boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
482 boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
483
484 return boot_params;
485
486fail2:
487 efi_free(sys_table, options_size, hdr->cmd_line_ptr);
488fail:
489 efi_free(sys_table, 0x4000, (unsigned long)boot_params);
490
491 return NULL;
492}
493
494static void add_e820ext(struct boot_params *params,
495 struct setup_data *e820ext, u32 nr_entries)
496{
497 struct setup_data *data;
498 efi_status_t status;
499 unsigned long size;
500
501 e820ext->type = SETUP_E820_EXT;
502 e820ext->len = nr_entries * sizeof(struct boot_e820_entry);
503 e820ext->next = 0;
504
505 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
506
507 while (data && data->next)
508 data = (struct setup_data *)(unsigned long)data->next;
509
510 if (data)
511 data->next = (unsigned long)e820ext;
512 else
513 params->hdr.setup_data = (unsigned long)e820ext;
514}
515
516static efi_status_t
517setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_size)
518{
519 struct boot_e820_entry *entry = params->e820_table;
520 struct efi_info *efi = &params->efi_info;
521 struct boot_e820_entry *prev = NULL;
522 u32 nr_entries;
523 u32 nr_desc;
524 int i;
525
526 nr_entries = 0;
527 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
528
529 for (i = 0; i < nr_desc; i++) {
530 efi_memory_desc_t *d;
531 unsigned int e820_type = 0;
532 unsigned long m = efi->efi_memmap;
533
534#ifdef CONFIG_X86_64
535 m |= (u64)efi->efi_memmap_hi << 32;
536#endif
537
538 d = efi_early_memdesc_ptr(m, efi->efi_memdesc_size, i);
539 switch (d->type) {
540 case EFI_RESERVED_TYPE:
541 case EFI_RUNTIME_SERVICES_CODE:
542 case EFI_RUNTIME_SERVICES_DATA:
543 case EFI_MEMORY_MAPPED_IO:
544 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
545 case EFI_PAL_CODE:
546 e820_type = E820_TYPE_RESERVED;
547 break;
548
549 case EFI_UNUSABLE_MEMORY:
550 e820_type = E820_TYPE_UNUSABLE;
551 break;
552
553 case EFI_ACPI_RECLAIM_MEMORY:
554 e820_type = E820_TYPE_ACPI;
555 break;
556
557 case EFI_LOADER_CODE:
558 case EFI_LOADER_DATA:
559 case EFI_BOOT_SERVICES_CODE:
560 case EFI_BOOT_SERVICES_DATA:
561 case EFI_CONVENTIONAL_MEMORY:
562 e820_type = E820_TYPE_RAM;
563 break;
564
565 case EFI_ACPI_MEMORY_NVS:
566 e820_type = E820_TYPE_NVS;
567 break;
568
569 case EFI_PERSISTENT_MEMORY:
570 e820_type = E820_TYPE_PMEM;
571 break;
572
573 default:
574 continue;
575 }
576
577 /* Merge adjacent mappings */
578 if (prev && prev->type == e820_type &&
579 (prev->addr + prev->size) == d->phys_addr) {
580 prev->size += d->num_pages << 12;
581 continue;
582 }
583
584 if (nr_entries == ARRAY_SIZE(params->e820_table)) {
585 u32 need = (nr_desc - i) * sizeof(struct e820_entry) +
586 sizeof(struct setup_data);
587
588 if (!e820ext || e820ext_size < need)
589 return EFI_BUFFER_TOO_SMALL;
590
591 /* boot_params map full, switch to e820 extended */
592 entry = (struct boot_e820_entry *)e820ext->data;
593 }
594
595 entry->addr = d->phys_addr;
596 entry->size = d->num_pages << PAGE_SHIFT;
597 entry->type = e820_type;
598 prev = entry++;
599 nr_entries++;
600 }
601
602 if (nr_entries > ARRAY_SIZE(params->e820_table)) {
603 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_table);
604
605 add_e820ext(params, e820ext, nr_e820ext);
606 nr_entries -= nr_e820ext;
607 }
608
609 params->e820_entries = (u8)nr_entries;
610
611 return EFI_SUCCESS;
612}
613
614static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
615 u32 *e820ext_size)
616{
617 efi_status_t status;
618 unsigned long size;
619
620 size = sizeof(struct setup_data) +
621 sizeof(struct e820_entry) * nr_desc;
622
623 if (*e820ext) {
624 efi_call_early(free_pool, *e820ext);
625 *e820ext = NULL;
626 *e820ext_size = 0;
627 }
628
629 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
630 size, (void **)e820ext);
631 if (status == EFI_SUCCESS)
632 *e820ext_size = size;
633
634 return status;
635}
636
637struct exit_boot_struct {
638 struct boot_params *boot_params;
639 struct efi_info *efi;
640 struct setup_data *e820ext;
641 __u32 e820ext_size;
642};
643
644static efi_status_t exit_boot_func(efi_system_table_t *sys_table_arg,
645 struct efi_boot_memmap *map,
646 void *priv)
647{
648 static bool first = true;
649 const char *signature;
650 __u32 nr_desc;
651 efi_status_t status;
652 struct exit_boot_struct *p = priv;
653
654 if (first) {
655 nr_desc = *map->buff_size / *map->desc_size;
656 if (nr_desc > ARRAY_SIZE(p->boot_params->e820_table)) {
657 u32 nr_e820ext = nr_desc -
658 ARRAY_SIZE(p->boot_params->e820_table);
659
660 status = alloc_e820ext(nr_e820ext, &p->e820ext,
661 &p->e820ext_size);
662 if (status != EFI_SUCCESS)
663 return status;
664 }
665 first = false;
666 }
667
668 signature = efi_is_64bit() ? EFI64_LOADER_SIGNATURE
669 : EFI32_LOADER_SIGNATURE;
670 memcpy(&p->efi->efi_loader_signature, signature, sizeof(__u32));
671
672 p->efi->efi_systab = (unsigned long)sys_table_arg;
673 p->efi->efi_memdesc_size = *map->desc_size;
674 p->efi->efi_memdesc_version = *map->desc_ver;
675 p->efi->efi_memmap = (unsigned long)*map->map;
676 p->efi->efi_memmap_size = *map->map_size;
677
678#ifdef CONFIG_X86_64
679 p->efi->efi_systab_hi = (unsigned long)sys_table_arg >> 32;
680 p->efi->efi_memmap_hi = (unsigned long)*map->map >> 32;
681#endif
682
683 return EFI_SUCCESS;
684}
685
686static efi_status_t exit_boot(struct boot_params *boot_params, void *handle)
687{
688 unsigned long map_sz, key, desc_size, buff_size;
689 efi_memory_desc_t *mem_map;
690 struct setup_data *e820ext;
691 __u32 e820ext_size;
692 efi_status_t status;
693 __u32 desc_version;
694 struct efi_boot_memmap map;
695 struct exit_boot_struct priv;
696
697 map.map = &mem_map;
698 map.map_size = &map_sz;
699 map.desc_size = &desc_size;
700 map.desc_ver = &desc_version;
701 map.key_ptr = &key;
702 map.buff_size = &buff_size;
703 priv.boot_params = boot_params;
704 priv.efi = &boot_params->efi_info;
705 priv.e820ext = NULL;
706 priv.e820ext_size = 0;
707
708 /* Might as well exit boot services now */
709 status = efi_exit_boot_services(sys_table, handle, &map, &priv,
710 exit_boot_func);
711 if (status != EFI_SUCCESS)
712 return status;
713
714 e820ext = priv.e820ext;
715 e820ext_size = priv.e820ext_size;
716
717 /* Historic? */
718 boot_params->alt_mem_k = 32 * 1024;
719
720 status = setup_e820(boot_params, e820ext, e820ext_size);
721 if (status != EFI_SUCCESS)
722 return status;
723
724 return EFI_SUCCESS;
725}
726
727/*
728 * On success we return a pointer to a boot_params structure, and NULL
729 * on failure.
730 */
731struct boot_params *
732efi_main(struct efi_config *c, struct boot_params *boot_params)
733{
734 struct desc_ptr *gdt = NULL;
735 efi_loaded_image_t *image;
736 struct setup_header *hdr = &boot_params->hdr;
737 efi_status_t status;
738 struct desc_struct *desc;
739 void *handle;
740 efi_system_table_t *_table;
741
742 efi_early = c;
743
744 _table = (efi_system_table_t *)(unsigned long)efi_early->table;
745 handle = (void *)(unsigned long)efi_early->image_handle;
746
747 sys_table = _table;
748
749 /* Check if we were booted by the EFI firmware */
750 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
751 goto fail;
752
753 if (efi_is_64bit())
754 setup_boot_services64(efi_early);
755 else
756 setup_boot_services32(efi_early);
757
758 /*
759 * If the boot loader gave us a value for secure_boot then we use that,
760 * otherwise we ask the BIOS.
761 */
762 if (boot_params->secure_boot == efi_secureboot_mode_unset)
763 boot_params->secure_boot = efi_get_secureboot(sys_table);
764
765 /* Ask the firmware to clear memory on unclean shutdown */
766 efi_enable_reset_attack_mitigation(sys_table);
767 efi_retrieve_tpm2_eventlog(sys_table);
768
769 setup_graphics(boot_params);
770
771 setup_efi_pci(boot_params);
772
773 setup_quirks(boot_params);
774
775 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
776 sizeof(*gdt), (void **)&gdt);
777 if (status != EFI_SUCCESS) {
778 efi_printk(sys_table, "Failed to allocate memory for 'gdt' structure\n");
779 goto fail;
780 }
781
782 gdt->size = 0x800;
783 status = efi_low_alloc(sys_table, gdt->size, 8,
784 (unsigned long *)&gdt->address);
785 if (status != EFI_SUCCESS) {
786 efi_printk(sys_table, "Failed to allocate memory for 'gdt'\n");
787 goto fail;
788 }
789
790 /*
791 * If the kernel isn't already loaded at the preferred load
792 * address, relocate it.
793 */
794 if (hdr->pref_address != hdr->code32_start) {
795 unsigned long bzimage_addr = hdr->code32_start;
796 status = efi_relocate_kernel(sys_table, &bzimage_addr,
797 hdr->init_size, hdr->init_size,
798 hdr->pref_address,
799 hdr->kernel_alignment);
800 if (status != EFI_SUCCESS) {
801 efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
802 goto fail;
803 }
804
805 hdr->pref_address = hdr->code32_start;
806 hdr->code32_start = bzimage_addr;
807 }
808
809 status = exit_boot(boot_params, handle);
810 if (status != EFI_SUCCESS) {
811 efi_printk(sys_table, "exit_boot() failed!\n");
812 goto fail;
813 }
814
815 memset((char *)gdt->address, 0x0, gdt->size);
816 desc = (struct desc_struct *)gdt->address;
817
818 /* The first GDT is a dummy. */
819 desc++;
820
821 if (IS_ENABLED(CONFIG_X86_64)) {
822 /* __KERNEL32_CS */
823 desc->limit0 = 0xffff;
824 desc->base0 = 0x0000;
825 desc->base1 = 0x0000;
826 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
827 desc->s = DESC_TYPE_CODE_DATA;
828 desc->dpl = 0;
829 desc->p = 1;
830 desc->limit1 = 0xf;
831 desc->avl = 0;
832 desc->l = 0;
833 desc->d = SEG_OP_SIZE_32BIT;
834 desc->g = SEG_GRANULARITY_4KB;
835 desc->base2 = 0x00;
836
837 desc++;
838 } else {
839 /* Second entry is unused on 32-bit */
840 desc++;
841 }
842
843 /* __KERNEL_CS */
844 desc->limit0 = 0xffff;
845 desc->base0 = 0x0000;
846 desc->base1 = 0x0000;
847 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
848 desc->s = DESC_TYPE_CODE_DATA;
849 desc->dpl = 0;
850 desc->p = 1;
851 desc->limit1 = 0xf;
852 desc->avl = 0;
853
854 if (IS_ENABLED(CONFIG_X86_64)) {
855 desc->l = 1;
856 desc->d = 0;
857 } else {
858 desc->l = 0;
859 desc->d = SEG_OP_SIZE_32BIT;
860 }
861 desc->g = SEG_GRANULARITY_4KB;
862 desc->base2 = 0x00;
863 desc++;
864
865 /* __KERNEL_DS */
866 desc->limit0 = 0xffff;
867 desc->base0 = 0x0000;
868 desc->base1 = 0x0000;
869 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
870 desc->s = DESC_TYPE_CODE_DATA;
871 desc->dpl = 0;
872 desc->p = 1;
873 desc->limit1 = 0xf;
874 desc->avl = 0;
875 desc->l = 0;
876 desc->d = SEG_OP_SIZE_32BIT;
877 desc->g = SEG_GRANULARITY_4KB;
878 desc->base2 = 0x00;
879 desc++;
880
881 if (IS_ENABLED(CONFIG_X86_64)) {
882 /* Task segment value */
883 desc->limit0 = 0x0000;
884 desc->base0 = 0x0000;
885 desc->base1 = 0x0000;
886 desc->type = SEG_TYPE_TSS;
887 desc->s = 0;
888 desc->dpl = 0;
889 desc->p = 1;
890 desc->limit1 = 0x0;
891 desc->avl = 0;
892 desc->l = 0;
893 desc->d = 0;
894 desc->g = SEG_GRANULARITY_4KB;
895 desc->base2 = 0x00;
896 desc++;
897 }
898
899 asm volatile("cli");
900 asm volatile ("lgdt %0" : : "m" (*gdt));
901
902 return boot_params;
903fail:
904 efi_printk(sys_table, "efi_main() failed!\n");
905
906 return NULL;
907}
908