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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#include <asm/efi.h>
13#include <asm/setup.h>
14#include <asm/desc.h>
15
16#undef memcpy /* Use memcpy from misc.c */
17
18#include "eboot.h"
19
20static efi_system_table_t *sys_table;
21
22static struct efi_config *efi_early;
23
24#define efi_call_early(f, ...) \
25 efi_early->call(efi_early->f, __VA_ARGS__);
26
27#define BOOT_SERVICES(bits) \
28static void setup_boot_services##bits(struct efi_config *c) \
29{ \
30 efi_system_table_##bits##_t *table; \
31 efi_boot_services_##bits##_t *bt; \
32 \
33 table = (typeof(table))sys_table; \
34 \
35 c->text_output = table->con_out; \
36 \
37 bt = (typeof(bt))(unsigned long)(table->boottime); \
38 \
39 c->allocate_pool = bt->allocate_pool; \
40 c->allocate_pages = bt->allocate_pages; \
41 c->get_memory_map = bt->get_memory_map; \
42 c->free_pool = bt->free_pool; \
43 c->free_pages = bt->free_pages; \
44 c->locate_handle = bt->locate_handle; \
45 c->handle_protocol = bt->handle_protocol; \
46 c->exit_boot_services = bt->exit_boot_services; \
47}
48BOOT_SERVICES(32);
49BOOT_SERVICES(64);
50
51static void efi_printk(efi_system_table_t *, char *);
52static void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
53
54static efi_status_t
55__file_size32(void *__fh, efi_char16_t *filename_16,
56 void **handle, u64 *file_sz)
57{
58 efi_file_handle_32_t *h, *fh = __fh;
59 efi_file_info_t *info;
60 efi_status_t status;
61 efi_guid_t info_guid = EFI_FILE_INFO_ID;
62 u32 info_sz;
63
64 status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
65 EFI_FILE_MODE_READ, (u64)0);
66 if (status != EFI_SUCCESS) {
67 efi_printk(sys_table, "Failed to open file: ");
68 efi_char16_printk(sys_table, filename_16);
69 efi_printk(sys_table, "\n");
70 return status;
71 }
72
73 *handle = h;
74
75 info_sz = 0;
76 status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
77 &info_sz, NULL);
78 if (status != EFI_BUFFER_TOO_SMALL) {
79 efi_printk(sys_table, "Failed to get file info size\n");
80 return status;
81 }
82
83grow:
84 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
85 info_sz, (void **)&info);
86 if (status != EFI_SUCCESS) {
87 efi_printk(sys_table, "Failed to alloc mem for file info\n");
88 return status;
89 }
90
91 status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
92 &info_sz, info);
93 if (status == EFI_BUFFER_TOO_SMALL) {
94 efi_call_early(free_pool, info);
95 goto grow;
96 }
97
98 *file_sz = info->file_size;
99 efi_call_early(free_pool, info);
100
101 if (status != EFI_SUCCESS)
102 efi_printk(sys_table, "Failed to get initrd info\n");
103
104 return status;
105}
106
107static efi_status_t
108__file_size64(void *__fh, efi_char16_t *filename_16,
109 void **handle, u64 *file_sz)
110{
111 efi_file_handle_64_t *h, *fh = __fh;
112 efi_file_info_t *info;
113 efi_status_t status;
114 efi_guid_t info_guid = EFI_FILE_INFO_ID;
115 u64 info_sz;
116
117 status = efi_early->call((unsigned long)fh->open, fh, &h, filename_16,
118 EFI_FILE_MODE_READ, (u64)0);
119 if (status != EFI_SUCCESS) {
120 efi_printk(sys_table, "Failed to open file: ");
121 efi_char16_printk(sys_table, filename_16);
122 efi_printk(sys_table, "\n");
123 return status;
124 }
125
126 *handle = h;
127
128 info_sz = 0;
129 status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
130 &info_sz, NULL);
131 if (status != EFI_BUFFER_TOO_SMALL) {
132 efi_printk(sys_table, "Failed to get file info size\n");
133 return status;
134 }
135
136grow:
137 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
138 info_sz, (void **)&info);
139 if (status != EFI_SUCCESS) {
140 efi_printk(sys_table, "Failed to alloc mem for file info\n");
141 return status;
142 }
143
144 status = efi_early->call((unsigned long)h->get_info, h, &info_guid,
145 &info_sz, info);
146 if (status == EFI_BUFFER_TOO_SMALL) {
147 efi_call_early(free_pool, info);
148 goto grow;
149 }
150
151 *file_sz = info->file_size;
152 efi_call_early(free_pool, info);
153
154 if (status != EFI_SUCCESS)
155 efi_printk(sys_table, "Failed to get initrd info\n");
156
157 return status;
158}
159static efi_status_t
160efi_file_size(efi_system_table_t *sys_table, void *__fh,
161 efi_char16_t *filename_16, void **handle, u64 *file_sz)
162{
163 if (efi_early->is64)
164 return __file_size64(__fh, filename_16, handle, file_sz);
165
166 return __file_size32(__fh, filename_16, handle, file_sz);
167}
168
169static inline efi_status_t
170efi_file_read(void *handle, unsigned long *size, void *addr)
171{
172 unsigned long func;
173
174 if (efi_early->is64) {
175 efi_file_handle_64_t *fh = handle;
176
177 func = (unsigned long)fh->read;
178 return efi_early->call(func, handle, size, addr);
179 } else {
180 efi_file_handle_32_t *fh = handle;
181
182 func = (unsigned long)fh->read;
183 return efi_early->call(func, handle, size, addr);
184 }
185}
186
187static inline efi_status_t efi_file_close(void *handle)
188{
189 if (efi_early->is64) {
190 efi_file_handle_64_t *fh = handle;
191
192 return efi_early->call((unsigned long)fh->close, handle);
193 } else {
194 efi_file_handle_32_t *fh = handle;
195
196 return efi_early->call((unsigned long)fh->close, handle);
197 }
198}
199
200static inline efi_status_t __open_volume32(void *__image, void **__fh)
201{
202 efi_file_io_interface_t *io;
203 efi_loaded_image_32_t *image = __image;
204 efi_file_handle_32_t *fh;
205 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
206 efi_status_t status;
207 void *handle = (void *)(unsigned long)image->device_handle;
208 unsigned long func;
209
210 status = efi_call_early(handle_protocol, handle,
211 &fs_proto, (void **)&io);
212 if (status != EFI_SUCCESS) {
213 efi_printk(sys_table, "Failed to handle fs_proto\n");
214 return status;
215 }
216
217 func = (unsigned long)io->open_volume;
218 status = efi_early->call(func, io, &fh);
219 if (status != EFI_SUCCESS)
220 efi_printk(sys_table, "Failed to open volume\n");
221
222 *__fh = fh;
223 return status;
224}
225
226static inline efi_status_t __open_volume64(void *__image, void **__fh)
227{
228 efi_file_io_interface_t *io;
229 efi_loaded_image_64_t *image = __image;
230 efi_file_handle_64_t *fh;
231 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
232 efi_status_t status;
233 void *handle = (void *)(unsigned long)image->device_handle;
234 unsigned long func;
235
236 status = efi_call_early(handle_protocol, handle,
237 &fs_proto, (void **)&io);
238 if (status != EFI_SUCCESS) {
239 efi_printk(sys_table, "Failed to handle fs_proto\n");
240 return status;
241 }
242
243 func = (unsigned long)io->open_volume;
244 status = efi_early->call(func, io, &fh);
245 if (status != EFI_SUCCESS)
246 efi_printk(sys_table, "Failed to open volume\n");
247
248 *__fh = fh;
249 return status;
250}
251
252static inline efi_status_t
253efi_open_volume(efi_system_table_t *sys_table, void *__image, void **__fh)
254{
255 if (efi_early->is64)
256 return __open_volume64(__image, __fh);
257
258 return __open_volume32(__image, __fh);
259}
260
261static void efi_char16_printk(efi_system_table_t *table, efi_char16_t *str)
262{
263 unsigned long output_string;
264 size_t offset;
265
266 if (efi_early->is64) {
267 struct efi_simple_text_output_protocol_64 *out;
268 u64 *func;
269
270 offset = offsetof(typeof(*out), output_string);
271 output_string = efi_early->text_output + offset;
272 func = (u64 *)output_string;
273
274 efi_early->call(*func, efi_early->text_output, str);
275 } else {
276 struct efi_simple_text_output_protocol_32 *out;
277 u32 *func;
278
279 offset = offsetof(typeof(*out), output_string);
280 output_string = efi_early->text_output + offset;
281 func = (u32 *)output_string;
282
283 efi_early->call(*func, efi_early->text_output, str);
284 }
285}
286
287#include "../../../../drivers/firmware/efi/efi-stub-helper.c"
288
289static void find_bits(unsigned long mask, u8 *pos, u8 *size)
290{
291 u8 first, len;
292
293 first = 0;
294 len = 0;
295
296 if (mask) {
297 while (!(mask & 0x1)) {
298 mask = mask >> 1;
299 first++;
300 }
301
302 while (mask & 0x1) {
303 mask = mask >> 1;
304 len++;
305 }
306 }
307
308 *pos = first;
309 *size = len;
310}
311
312static efi_status_t
313__setup_efi_pci32(efi_pci_io_protocol_32 *pci, struct pci_setup_rom **__rom)
314{
315 struct pci_setup_rom *rom = NULL;
316 efi_status_t status;
317 unsigned long size;
318 uint64_t attributes;
319
320 status = efi_early->call(pci->attributes, pci,
321 EfiPciIoAttributeOperationGet, 0, 0,
322 &attributes);
323 if (status != EFI_SUCCESS)
324 return status;
325
326 if (!pci->romimage || !pci->romsize)
327 return EFI_INVALID_PARAMETER;
328
329 size = pci->romsize + sizeof(*rom);
330
331 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
332 if (status != EFI_SUCCESS)
333 return status;
334
335 memset(rom, 0, sizeof(*rom));
336
337 rom->data.type = SETUP_PCI;
338 rom->data.len = size - sizeof(struct setup_data);
339 rom->data.next = 0;
340 rom->pcilen = pci->romsize;
341 *__rom = rom;
342
343 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
344 PCI_VENDOR_ID, 1, &(rom->vendor));
345
346 if (status != EFI_SUCCESS)
347 goto free_struct;
348
349 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
350 PCI_DEVICE_ID, 1, &(rom->devid));
351
352 if (status != EFI_SUCCESS)
353 goto free_struct;
354
355 status = efi_early->call(pci->get_location, pci, &(rom->segment),
356 &(rom->bus), &(rom->device), &(rom->function));
357
358 if (status != EFI_SUCCESS)
359 goto free_struct;
360
361 memcpy(rom->romdata, pci->romimage, pci->romsize);
362 return status;
363
364free_struct:
365 efi_call_early(free_pool, rom);
366 return status;
367}
368
369static efi_status_t
370setup_efi_pci32(struct boot_params *params, void **pci_handle,
371 unsigned long size)
372{
373 efi_pci_io_protocol_32 *pci = NULL;
374 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
375 u32 *handles = (u32 *)(unsigned long)pci_handle;
376 efi_status_t status;
377 unsigned long nr_pci;
378 struct setup_data *data;
379 int i;
380
381 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
382
383 while (data && data->next)
384 data = (struct setup_data *)(unsigned long)data->next;
385
386 nr_pci = size / sizeof(u32);
387 for (i = 0; i < nr_pci; i++) {
388 struct pci_setup_rom *rom = NULL;
389 u32 h = handles[i];
390
391 status = efi_call_early(handle_protocol, h,
392 &pci_proto, (void **)&pci);
393
394 if (status != EFI_SUCCESS)
395 continue;
396
397 if (!pci)
398 continue;
399
400 status = __setup_efi_pci32(pci, &rom);
401 if (status != EFI_SUCCESS)
402 continue;
403
404 if (data)
405 data->next = (unsigned long)rom;
406 else
407 params->hdr.setup_data = (unsigned long)rom;
408
409 data = (struct setup_data *)rom;
410
411 }
412
413 return status;
414}
415
416static efi_status_t
417__setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
418{
419 struct pci_setup_rom *rom;
420 efi_status_t status;
421 unsigned long size;
422 uint64_t attributes;
423
424 status = efi_early->call(pci->attributes, pci,
425 EfiPciIoAttributeOperationGet, 0,
426 &attributes);
427 if (status != EFI_SUCCESS)
428 return status;
429
430 if (!pci->romimage || !pci->romsize)
431 return EFI_INVALID_PARAMETER;
432
433 size = pci->romsize + sizeof(*rom);
434
435 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
436 if (status != EFI_SUCCESS)
437 return status;
438
439 rom->data.type = SETUP_PCI;
440 rom->data.len = size - sizeof(struct setup_data);
441 rom->data.next = 0;
442 rom->pcilen = pci->romsize;
443 *__rom = rom;
444
445 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
446 PCI_VENDOR_ID, 1, &(rom->vendor));
447
448 if (status != EFI_SUCCESS)
449 goto free_struct;
450
451 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
452 PCI_DEVICE_ID, 1, &(rom->devid));
453
454 if (status != EFI_SUCCESS)
455 goto free_struct;
456
457 status = efi_early->call(pci->get_location, pci, &(rom->segment),
458 &(rom->bus), &(rom->device), &(rom->function));
459
460 if (status != EFI_SUCCESS)
461 goto free_struct;
462
463 memcpy(rom->romdata, pci->romimage, pci->romsize);
464 return status;
465
466free_struct:
467 efi_call_early(free_pool, rom);
468 return status;
469
470}
471
472static efi_status_t
473setup_efi_pci64(struct boot_params *params, void **pci_handle,
474 unsigned long size)
475{
476 efi_pci_io_protocol_64 *pci = NULL;
477 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
478 u64 *handles = (u64 *)(unsigned long)pci_handle;
479 efi_status_t status;
480 unsigned long nr_pci;
481 struct setup_data *data;
482 int i;
483
484 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
485
486 while (data && data->next)
487 data = (struct setup_data *)(unsigned long)data->next;
488
489 nr_pci = size / sizeof(u64);
490 for (i = 0; i < nr_pci; i++) {
491 struct pci_setup_rom *rom = NULL;
492 u64 h = handles[i];
493
494 status = efi_call_early(handle_protocol, h,
495 &pci_proto, (void **)&pci);
496
497 if (status != EFI_SUCCESS)
498 continue;
499
500 if (!pci)
501 continue;
502
503 status = __setup_efi_pci64(pci, &rom);
504 if (status != EFI_SUCCESS)
505 continue;
506
507 if (data)
508 data->next = (unsigned long)rom;
509 else
510 params->hdr.setup_data = (unsigned long)rom;
511
512 data = (struct setup_data *)rom;
513
514 }
515
516 return status;
517}
518
519static efi_status_t setup_efi_pci(struct boot_params *params)
520{
521 efi_status_t status;
522 void **pci_handle = NULL;
523 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
524 unsigned long size = 0;
525
526 status = efi_call_early(locate_handle,
527 EFI_LOCATE_BY_PROTOCOL,
528 &pci_proto, NULL, &size, pci_handle);
529
530 if (status == EFI_BUFFER_TOO_SMALL) {
531 status = efi_call_early(allocate_pool,
532 EFI_LOADER_DATA,
533 size, (void **)&pci_handle);
534
535 if (status != EFI_SUCCESS)
536 return status;
537
538 status = efi_call_early(locate_handle,
539 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
540 NULL, &size, pci_handle);
541 }
542
543 if (status != EFI_SUCCESS)
544 goto free_handle;
545
546 if (efi_early->is64)
547 status = setup_efi_pci64(params, pci_handle, size);
548 else
549 status = setup_efi_pci32(params, pci_handle, size);
550
551free_handle:
552 efi_call_early(free_pool, pci_handle);
553 return status;
554}
555
556static void
557setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
558 struct efi_pixel_bitmask pixel_info, int pixel_format)
559{
560 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
561 si->lfb_depth = 32;
562 si->lfb_linelength = pixels_per_scan_line * 4;
563 si->red_size = 8;
564 si->red_pos = 0;
565 si->green_size = 8;
566 si->green_pos = 8;
567 si->blue_size = 8;
568 si->blue_pos = 16;
569 si->rsvd_size = 8;
570 si->rsvd_pos = 24;
571 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
572 si->lfb_depth = 32;
573 si->lfb_linelength = pixels_per_scan_line * 4;
574 si->red_size = 8;
575 si->red_pos = 16;
576 si->green_size = 8;
577 si->green_pos = 8;
578 si->blue_size = 8;
579 si->blue_pos = 0;
580 si->rsvd_size = 8;
581 si->rsvd_pos = 24;
582 } else if (pixel_format == PIXEL_BIT_MASK) {
583 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
584 find_bits(pixel_info.green_mask, &si->green_pos,
585 &si->green_size);
586 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
587 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
588 &si->rsvd_size);
589 si->lfb_depth = si->red_size + si->green_size +
590 si->blue_size + si->rsvd_size;
591 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
592 } else {
593 si->lfb_depth = 4;
594 si->lfb_linelength = si->lfb_width / 2;
595 si->red_size = 0;
596 si->red_pos = 0;
597 si->green_size = 0;
598 si->green_pos = 0;
599 si->blue_size = 0;
600 si->blue_pos = 0;
601 si->rsvd_size = 0;
602 si->rsvd_pos = 0;
603 }
604}
605
606static efi_status_t
607__gop_query32(struct efi_graphics_output_protocol_32 *gop32,
608 struct efi_graphics_output_mode_info **info,
609 unsigned long *size, u32 *fb_base)
610{
611 struct efi_graphics_output_protocol_mode_32 *mode;
612 efi_status_t status;
613 unsigned long m;
614
615 m = gop32->mode;
616 mode = (struct efi_graphics_output_protocol_mode_32 *)m;
617
618 status = efi_early->call(gop32->query_mode, gop32,
619 mode->mode, size, info);
620 if (status != EFI_SUCCESS)
621 return status;
622
623 *fb_base = mode->frame_buffer_base;
624 return status;
625}
626
627static efi_status_t
628setup_gop32(struct screen_info *si, efi_guid_t *proto,
629 unsigned long size, void **gop_handle)
630{
631 struct efi_graphics_output_protocol_32 *gop32, *first_gop;
632 unsigned long nr_gops;
633 u16 width, height;
634 u32 pixels_per_scan_line;
635 u32 fb_base;
636 struct efi_pixel_bitmask pixel_info;
637 int pixel_format;
638 efi_status_t status;
639 u32 *handles = (u32 *)(unsigned long)gop_handle;
640 int i;
641
642 first_gop = NULL;
643 gop32 = NULL;
644
645 nr_gops = size / sizeof(u32);
646 for (i = 0; i < nr_gops; i++) {
647 struct efi_graphics_output_mode_info *info = NULL;
648 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
649 bool conout_found = false;
650 void *dummy = NULL;
651 u32 h = handles[i];
652
653 status = efi_call_early(handle_protocol, h,
654 proto, (void **)&gop32);
655 if (status != EFI_SUCCESS)
656 continue;
657
658 status = efi_call_early(handle_protocol, h,
659 &conout_proto, &dummy);
660 if (status == EFI_SUCCESS)
661 conout_found = true;
662
663 status = __gop_query32(gop32, &info, &size, &fb_base);
664 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
665 /*
666 * Systems that use the UEFI Console Splitter may
667 * provide multiple GOP devices, not all of which are
668 * backed by real hardware. The workaround is to search
669 * for a GOP implementing the ConOut protocol, and if
670 * one isn't found, to just fall back to the first GOP.
671 */
672 width = info->horizontal_resolution;
673 height = info->vertical_resolution;
674 pixel_format = info->pixel_format;
675 pixel_info = info->pixel_information;
676 pixels_per_scan_line = info->pixels_per_scan_line;
677
678 /*
679 * Once we've found a GOP supporting ConOut,
680 * don't bother looking any further.
681 */
682 first_gop = gop32;
683 if (conout_found)
684 break;
685 }
686 }
687
688 /* Did we find any GOPs? */
689 if (!first_gop)
690 goto out;
691
692 /* EFI framebuffer */
693 si->orig_video_isVGA = VIDEO_TYPE_EFI;
694
695 si->lfb_width = width;
696 si->lfb_height = height;
697 si->lfb_base = fb_base;
698 si->pages = 1;
699
700 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
701
702 si->lfb_size = si->lfb_linelength * si->lfb_height;
703
704 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
705out:
706 return status;
707}
708
709static efi_status_t
710__gop_query64(struct efi_graphics_output_protocol_64 *gop64,
711 struct efi_graphics_output_mode_info **info,
712 unsigned long *size, u32 *fb_base)
713{
714 struct efi_graphics_output_protocol_mode_64 *mode;
715 efi_status_t status;
716 unsigned long m;
717
718 m = gop64->mode;
719 mode = (struct efi_graphics_output_protocol_mode_64 *)m;
720
721 status = efi_early->call(gop64->query_mode, gop64,
722 mode->mode, size, info);
723 if (status != EFI_SUCCESS)
724 return status;
725
726 *fb_base = mode->frame_buffer_base;
727 return status;
728}
729
730static efi_status_t
731setup_gop64(struct screen_info *si, efi_guid_t *proto,
732 unsigned long size, void **gop_handle)
733{
734 struct efi_graphics_output_protocol_64 *gop64, *first_gop;
735 unsigned long nr_gops;
736 u16 width, height;
737 u32 pixels_per_scan_line;
738 u32 fb_base;
739 struct efi_pixel_bitmask pixel_info;
740 int pixel_format;
741 efi_status_t status;
742 u64 *handles = (u64 *)(unsigned long)gop_handle;
743 int i;
744
745 first_gop = NULL;
746 gop64 = NULL;
747
748 nr_gops = size / sizeof(u64);
749 for (i = 0; i < nr_gops; i++) {
750 struct efi_graphics_output_mode_info *info = NULL;
751 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
752 bool conout_found = false;
753 void *dummy = NULL;
754 u64 h = handles[i];
755
756 status = efi_call_early(handle_protocol, h,
757 proto, (void **)&gop64);
758 if (status != EFI_SUCCESS)
759 continue;
760
761 status = efi_call_early(handle_protocol, h,
762 &conout_proto, &dummy);
763 if (status == EFI_SUCCESS)
764 conout_found = true;
765
766 status = __gop_query64(gop64, &info, &size, &fb_base);
767 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
768 /*
769 * Systems that use the UEFI Console Splitter may
770 * provide multiple GOP devices, not all of which are
771 * backed by real hardware. The workaround is to search
772 * for a GOP implementing the ConOut protocol, and if
773 * one isn't found, to just fall back to the first GOP.
774 */
775 width = info->horizontal_resolution;
776 height = info->vertical_resolution;
777 pixel_format = info->pixel_format;
778 pixel_info = info->pixel_information;
779 pixels_per_scan_line = info->pixels_per_scan_line;
780
781 /*
782 * Once we've found a GOP supporting ConOut,
783 * don't bother looking any further.
784 */
785 first_gop = gop64;
786 if (conout_found)
787 break;
788 }
789 }
790
791 /* Did we find any GOPs? */
792 if (!first_gop)
793 goto out;
794
795 /* EFI framebuffer */
796 si->orig_video_isVGA = VIDEO_TYPE_EFI;
797
798 si->lfb_width = width;
799 si->lfb_height = height;
800 si->lfb_base = fb_base;
801 si->pages = 1;
802
803 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
804
805 si->lfb_size = si->lfb_linelength * si->lfb_height;
806
807 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
808out:
809 return status;
810}
811
812/*
813 * See if we have Graphics Output Protocol
814 */
815static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
816 unsigned long size)
817{
818 efi_status_t status;
819 void **gop_handle = NULL;
820
821 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
822 size, (void **)&gop_handle);
823 if (status != EFI_SUCCESS)
824 return status;
825
826 status = efi_call_early(locate_handle,
827 EFI_LOCATE_BY_PROTOCOL,
828 proto, NULL, &size, gop_handle);
829 if (status != EFI_SUCCESS)
830 goto free_handle;
831
832 if (efi_early->is64)
833 status = setup_gop64(si, proto, size, gop_handle);
834 else
835 status = setup_gop32(si, proto, size, gop_handle);
836
837free_handle:
838 efi_call_early(free_pool, gop_handle);
839 return status;
840}
841
842static efi_status_t
843setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
844{
845 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
846 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
847 unsigned long nr_ugas;
848 u32 *handles = (u32 *)uga_handle;;
849 efi_status_t status;
850 int i;
851
852 first_uga = NULL;
853 nr_ugas = size / sizeof(u32);
854 for (i = 0; i < nr_ugas; i++) {
855 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
856 u32 w, h, depth, refresh;
857 void *pciio;
858 u32 handle = handles[i];
859
860 status = efi_call_early(handle_protocol, handle,
861 &uga_proto, (void **)&uga);
862 if (status != EFI_SUCCESS)
863 continue;
864
865 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
866
867 status = efi_early->call((unsigned long)uga->get_mode, uga,
868 &w, &h, &depth, &refresh);
869 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
870 *width = w;
871 *height = h;
872
873 /*
874 * Once we've found a UGA supporting PCIIO,
875 * don't bother looking any further.
876 */
877 if (pciio)
878 break;
879
880 first_uga = uga;
881 }
882 }
883
884 return status;
885}
886
887static efi_status_t
888setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
889{
890 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
891 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
892 unsigned long nr_ugas;
893 u64 *handles = (u64 *)uga_handle;;
894 efi_status_t status;
895 int i;
896
897 first_uga = NULL;
898 nr_ugas = size / sizeof(u64);
899 for (i = 0; i < nr_ugas; i++) {
900 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
901 u32 w, h, depth, refresh;
902 void *pciio;
903 u64 handle = handles[i];
904
905 status = efi_call_early(handle_protocol, handle,
906 &uga_proto, (void **)&uga);
907 if (status != EFI_SUCCESS)
908 continue;
909
910 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
911
912 status = efi_early->call((unsigned long)uga->get_mode, uga,
913 &w, &h, &depth, &refresh);
914 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
915 *width = w;
916 *height = h;
917
918 /*
919 * Once we've found a UGA supporting PCIIO,
920 * don't bother looking any further.
921 */
922 if (pciio)
923 break;
924
925 first_uga = uga;
926 }
927 }
928
929 return status;
930}
931
932/*
933 * See if we have Universal Graphics Adapter (UGA) protocol
934 */
935static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
936 unsigned long size)
937{
938 efi_status_t status;
939 u32 width, height;
940 void **uga_handle = NULL;
941
942 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
943 size, (void **)&uga_handle);
944 if (status != EFI_SUCCESS)
945 return status;
946
947 status = efi_call_early(locate_handle,
948 EFI_LOCATE_BY_PROTOCOL,
949 uga_proto, NULL, &size, uga_handle);
950 if (status != EFI_SUCCESS)
951 goto free_handle;
952
953 height = 0;
954 width = 0;
955
956 if (efi_early->is64)
957 status = setup_uga64(uga_handle, size, &width, &height);
958 else
959 status = setup_uga32(uga_handle, size, &width, &height);
960
961 if (!width && !height)
962 goto free_handle;
963
964 /* EFI framebuffer */
965 si->orig_video_isVGA = VIDEO_TYPE_EFI;
966
967 si->lfb_depth = 32;
968 si->lfb_width = width;
969 si->lfb_height = height;
970
971 si->red_size = 8;
972 si->red_pos = 16;
973 si->green_size = 8;
974 si->green_pos = 8;
975 si->blue_size = 8;
976 si->blue_pos = 0;
977 si->rsvd_size = 8;
978 si->rsvd_pos = 24;
979
980free_handle:
981 efi_call_early(free_pool, uga_handle);
982 return status;
983}
984
985void setup_graphics(struct boot_params *boot_params)
986{
987 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
988 struct screen_info *si;
989 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
990 efi_status_t status;
991 unsigned long size;
992 void **gop_handle = NULL;
993 void **uga_handle = NULL;
994
995 si = &boot_params->screen_info;
996 memset(si, 0, sizeof(*si));
997
998 size = 0;
999 status = efi_call_early(locate_handle,
1000 EFI_LOCATE_BY_PROTOCOL,
1001 &graphics_proto, NULL, &size, gop_handle);
1002 if (status == EFI_BUFFER_TOO_SMALL)
1003 status = setup_gop(si, &graphics_proto, size);
1004
1005 if (status != EFI_SUCCESS) {
1006 size = 0;
1007 status = efi_call_early(locate_handle,
1008 EFI_LOCATE_BY_PROTOCOL,
1009 &uga_proto, NULL, &size, uga_handle);
1010 if (status == EFI_BUFFER_TOO_SMALL)
1011 setup_uga(si, &uga_proto, size);
1012 }
1013}
1014
1015/*
1016 * Because the x86 boot code expects to be passed a boot_params we
1017 * need to create one ourselves (usually the bootloader would create
1018 * one for us).
1019 *
1020 * The caller is responsible for filling out ->code32_start in the
1021 * returned boot_params.
1022 */
1023struct boot_params *make_boot_params(struct efi_config *c)
1024{
1025 struct boot_params *boot_params;
1026 struct sys_desc_table *sdt;
1027 struct apm_bios_info *bi;
1028 struct setup_header *hdr;
1029 struct efi_info *efi;
1030 efi_loaded_image_t *image;
1031 void *options, *handle;
1032 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1033 int options_size = 0;
1034 efi_status_t status;
1035 char *cmdline_ptr;
1036 u16 *s2;
1037 u8 *s1;
1038 int i;
1039 unsigned long ramdisk_addr;
1040 unsigned long ramdisk_size;
1041
1042 efi_early = c;
1043 sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1044 handle = (void *)(unsigned long)efi_early->image_handle;
1045
1046 /* Check if we were booted by the EFI firmware */
1047 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1048 return NULL;
1049
1050 if (efi_early->is64)
1051 setup_boot_services64(efi_early);
1052 else
1053 setup_boot_services32(efi_early);
1054
1055 status = efi_call_early(handle_protocol, handle,
1056 &proto, (void *)&image);
1057 if (status != EFI_SUCCESS) {
1058 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1059 return NULL;
1060 }
1061
1062 status = efi_low_alloc(sys_table, 0x4000, 1,
1063 (unsigned long *)&boot_params);
1064 if (status != EFI_SUCCESS) {
1065 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1066 return NULL;
1067 }
1068
1069 memset(boot_params, 0x0, 0x4000);
1070
1071 hdr = &boot_params->hdr;
1072 efi = &boot_params->efi_info;
1073 bi = &boot_params->apm_bios_info;
1074 sdt = &boot_params->sys_desc_table;
1075
1076 /* Copy the second sector to boot_params */
1077 memcpy(&hdr->jump, image->image_base + 512, 512);
1078
1079 /*
1080 * Fill out some of the header fields ourselves because the
1081 * EFI firmware loader doesn't load the first sector.
1082 */
1083 hdr->root_flags = 1;
1084 hdr->vid_mode = 0xffff;
1085 hdr->boot_flag = 0xAA55;
1086
1087 hdr->type_of_loader = 0x21;
1088
1089 /* Convert unicode cmdline to ascii */
1090 cmdline_ptr = efi_convert_cmdline_to_ascii(sys_table, image,
1091 &options_size);
1092 if (!cmdline_ptr)
1093 goto fail;
1094 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1095
1096 hdr->ramdisk_image = 0;
1097 hdr->ramdisk_size = 0;
1098
1099 /* Clear APM BIOS info */
1100 memset(bi, 0, sizeof(*bi));
1101
1102 memset(sdt, 0, sizeof(*sdt));
1103
1104 status = handle_cmdline_files(sys_table, image,
1105 (char *)(unsigned long)hdr->cmd_line_ptr,
1106 "initrd=", hdr->initrd_addr_max,
1107 &ramdisk_addr, &ramdisk_size);
1108 if (status != EFI_SUCCESS)
1109 goto fail2;
1110 hdr->ramdisk_image = ramdisk_addr;
1111 hdr->ramdisk_size = ramdisk_size;
1112
1113 return boot_params;
1114fail2:
1115 efi_free(sys_table, options_size, hdr->cmd_line_ptr);
1116fail:
1117 efi_free(sys_table, 0x4000, (unsigned long)boot_params);
1118 return NULL;
1119}
1120
1121static void add_e820ext(struct boot_params *params,
1122 struct setup_data *e820ext, u32 nr_entries)
1123{
1124 struct setup_data *data;
1125 efi_status_t status;
1126 unsigned long size;
1127
1128 e820ext->type = SETUP_E820_EXT;
1129 e820ext->len = nr_entries * sizeof(struct e820entry);
1130 e820ext->next = 0;
1131
1132 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
1133
1134 while (data && data->next)
1135 data = (struct setup_data *)(unsigned long)data->next;
1136
1137 if (data)
1138 data->next = (unsigned long)e820ext;
1139 else
1140 params->hdr.setup_data = (unsigned long)e820ext;
1141}
1142
1143static efi_status_t setup_e820(struct boot_params *params,
1144 struct setup_data *e820ext, u32 e820ext_size)
1145{
1146 struct e820entry *e820_map = ¶ms->e820_map[0];
1147 struct efi_info *efi = ¶ms->efi_info;
1148 struct e820entry *prev = NULL;
1149 u32 nr_entries;
1150 u32 nr_desc;
1151 int i;
1152
1153 nr_entries = 0;
1154 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
1155
1156 for (i = 0; i < nr_desc; i++) {
1157 efi_memory_desc_t *d;
1158 unsigned int e820_type = 0;
1159 unsigned long m = efi->efi_memmap;
1160
1161 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
1162 switch (d->type) {
1163 case EFI_RESERVED_TYPE:
1164 case EFI_RUNTIME_SERVICES_CODE:
1165 case EFI_RUNTIME_SERVICES_DATA:
1166 case EFI_MEMORY_MAPPED_IO:
1167 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1168 case EFI_PAL_CODE:
1169 e820_type = E820_RESERVED;
1170 break;
1171
1172 case EFI_UNUSABLE_MEMORY:
1173 e820_type = E820_UNUSABLE;
1174 break;
1175
1176 case EFI_ACPI_RECLAIM_MEMORY:
1177 e820_type = E820_ACPI;
1178 break;
1179
1180 case EFI_LOADER_CODE:
1181 case EFI_LOADER_DATA:
1182 case EFI_BOOT_SERVICES_CODE:
1183 case EFI_BOOT_SERVICES_DATA:
1184 case EFI_CONVENTIONAL_MEMORY:
1185 e820_type = E820_RAM;
1186 break;
1187
1188 case EFI_ACPI_MEMORY_NVS:
1189 e820_type = E820_NVS;
1190 break;
1191
1192 default:
1193 continue;
1194 }
1195
1196 /* Merge adjacent mappings */
1197 if (prev && prev->type == e820_type &&
1198 (prev->addr + prev->size) == d->phys_addr) {
1199 prev->size += d->num_pages << 12;
1200 continue;
1201 }
1202
1203 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
1204 u32 need = (nr_desc - i) * sizeof(struct e820entry) +
1205 sizeof(struct setup_data);
1206
1207 if (!e820ext || e820ext_size < need)
1208 return EFI_BUFFER_TOO_SMALL;
1209
1210 /* boot_params map full, switch to e820 extended */
1211 e820_map = (struct e820entry *)e820ext->data;
1212 }
1213
1214 e820_map->addr = d->phys_addr;
1215 e820_map->size = d->num_pages << PAGE_SHIFT;
1216 e820_map->type = e820_type;
1217 prev = e820_map++;
1218 nr_entries++;
1219 }
1220
1221 if (nr_entries > ARRAY_SIZE(params->e820_map)) {
1222 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
1223
1224 add_e820ext(params, e820ext, nr_e820ext);
1225 nr_entries -= nr_e820ext;
1226 }
1227
1228 params->e820_entries = (u8)nr_entries;
1229
1230 return EFI_SUCCESS;
1231}
1232
1233static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
1234 u32 *e820ext_size)
1235{
1236 efi_status_t status;
1237 unsigned long size;
1238
1239 size = sizeof(struct setup_data) +
1240 sizeof(struct e820entry) * nr_desc;
1241
1242 if (*e820ext) {
1243 efi_call_early(free_pool, *e820ext);
1244 *e820ext = NULL;
1245 *e820ext_size = 0;
1246 }
1247
1248 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1249 size, (void **)e820ext);
1250 if (status == EFI_SUCCESS)
1251 *e820ext_size = size;
1252
1253 return status;
1254}
1255
1256static efi_status_t exit_boot(struct boot_params *boot_params,
1257 void *handle, bool is64)
1258{
1259 struct efi_info *efi = &boot_params->efi_info;
1260 unsigned long map_sz, key, desc_size;
1261 efi_memory_desc_t *mem_map;
1262 struct setup_data *e820ext;
1263 const char *signature;
1264 __u32 e820ext_size;
1265 __u32 nr_desc, prev_nr_desc;
1266 efi_status_t status;
1267 __u32 desc_version;
1268 bool called_exit = false;
1269 u8 nr_entries;
1270 int i;
1271
1272 nr_desc = 0;
1273 e820ext = NULL;
1274 e820ext_size = 0;
1275
1276get_map:
1277 status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
1278 &desc_version, &key);
1279
1280 if (status != EFI_SUCCESS)
1281 return status;
1282
1283 prev_nr_desc = nr_desc;
1284 nr_desc = map_sz / desc_size;
1285 if (nr_desc > prev_nr_desc &&
1286 nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1287 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1288
1289 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1290 if (status != EFI_SUCCESS)
1291 goto free_mem_map;
1292
1293 efi_call_early(free_pool, mem_map);
1294 goto get_map; /* Allocated memory, get map again */
1295 }
1296
1297 signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1298 memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1299
1300 efi->efi_systab = (unsigned long)sys_table;
1301 efi->efi_memdesc_size = desc_size;
1302 efi->efi_memdesc_version = desc_version;
1303 efi->efi_memmap = (unsigned long)mem_map;
1304 efi->efi_memmap_size = map_sz;
1305
1306#ifdef CONFIG_X86_64
1307 efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1308 efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1309#endif
1310
1311 /* Might as well exit boot services now */
1312 status = efi_call_early(exit_boot_services, handle, key);
1313 if (status != EFI_SUCCESS) {
1314 /*
1315 * ExitBootServices() will fail if any of the event
1316 * handlers change the memory map. In which case, we
1317 * must be prepared to retry, but only once so that
1318 * we're guaranteed to exit on repeated failures instead
1319 * of spinning forever.
1320 */
1321 if (called_exit)
1322 goto free_mem_map;
1323
1324 called_exit = true;
1325 efi_call_early(free_pool, mem_map);
1326 goto get_map;
1327 }
1328
1329 /* Historic? */
1330 boot_params->alt_mem_k = 32 * 1024;
1331
1332 status = setup_e820(boot_params, e820ext, e820ext_size);
1333 if (status != EFI_SUCCESS)
1334 return status;
1335
1336 return EFI_SUCCESS;
1337
1338free_mem_map:
1339 efi_call_early(free_pool, mem_map);
1340 return status;
1341}
1342
1343/*
1344 * On success we return a pointer to a boot_params structure, and NULL
1345 * on failure.
1346 */
1347struct boot_params *efi_main(struct efi_config *c,
1348 struct boot_params *boot_params)
1349{
1350 struct desc_ptr *gdt = NULL;
1351 efi_loaded_image_t *image;
1352 struct setup_header *hdr = &boot_params->hdr;
1353 efi_status_t status;
1354 struct desc_struct *desc;
1355 void *handle;
1356 efi_system_table_t *_table;
1357 bool is64;
1358
1359 efi_early = c;
1360
1361 _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1362 handle = (void *)(unsigned long)efi_early->image_handle;
1363 is64 = efi_early->is64;
1364
1365 sys_table = _table;
1366
1367 /* Check if we were booted by the EFI firmware */
1368 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1369 goto fail;
1370
1371 if (is64)
1372 setup_boot_services64(efi_early);
1373 else
1374 setup_boot_services32(efi_early);
1375
1376 setup_graphics(boot_params);
1377
1378 setup_efi_pci(boot_params);
1379
1380 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1381 sizeof(*gdt), (void **)&gdt);
1382 if (status != EFI_SUCCESS) {
1383 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1384 goto fail;
1385 }
1386
1387 gdt->size = 0x800;
1388 status = efi_low_alloc(sys_table, gdt->size, 8,
1389 (unsigned long *)&gdt->address);
1390 if (status != EFI_SUCCESS) {
1391 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1392 goto fail;
1393 }
1394
1395 /*
1396 * If the kernel isn't already loaded at the preferred load
1397 * address, relocate it.
1398 */
1399 if (hdr->pref_address != hdr->code32_start) {
1400 unsigned long bzimage_addr = hdr->code32_start;
1401 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1402 hdr->init_size, hdr->init_size,
1403 hdr->pref_address,
1404 hdr->kernel_alignment);
1405 if (status != EFI_SUCCESS)
1406 goto fail;
1407
1408 hdr->pref_address = hdr->code32_start;
1409 hdr->code32_start = bzimage_addr;
1410 }
1411
1412 status = exit_boot(boot_params, handle, is64);
1413 if (status != EFI_SUCCESS)
1414 goto fail;
1415
1416 memset((char *)gdt->address, 0x0, gdt->size);
1417 desc = (struct desc_struct *)gdt->address;
1418
1419 /* The first GDT is a dummy and the second is unused. */
1420 desc += 2;
1421
1422 desc->limit0 = 0xffff;
1423 desc->base0 = 0x0000;
1424 desc->base1 = 0x0000;
1425 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1426 desc->s = DESC_TYPE_CODE_DATA;
1427 desc->dpl = 0;
1428 desc->p = 1;
1429 desc->limit = 0xf;
1430 desc->avl = 0;
1431 desc->l = 0;
1432 desc->d = SEG_OP_SIZE_32BIT;
1433 desc->g = SEG_GRANULARITY_4KB;
1434 desc->base2 = 0x00;
1435
1436 desc++;
1437 desc->limit0 = 0xffff;
1438 desc->base0 = 0x0000;
1439 desc->base1 = 0x0000;
1440 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1441 desc->s = DESC_TYPE_CODE_DATA;
1442 desc->dpl = 0;
1443 desc->p = 1;
1444 desc->limit = 0xf;
1445 desc->avl = 0;
1446 desc->l = 0;
1447 desc->d = SEG_OP_SIZE_32BIT;
1448 desc->g = SEG_GRANULARITY_4KB;
1449 desc->base2 = 0x00;
1450
1451#ifdef CONFIG_X86_64
1452 /* Task segment value */
1453 desc++;
1454 desc->limit0 = 0x0000;
1455 desc->base0 = 0x0000;
1456 desc->base1 = 0x0000;
1457 desc->type = SEG_TYPE_TSS;
1458 desc->s = 0;
1459 desc->dpl = 0;
1460 desc->p = 1;
1461 desc->limit = 0x0;
1462 desc->avl = 0;
1463 desc->l = 0;
1464 desc->d = 0;
1465 desc->g = SEG_GRANULARITY_4KB;
1466 desc->base2 = 0x00;
1467#endif /* CONFIG_X86_64 */
1468
1469 asm volatile("cli");
1470 asm volatile ("lgdt %0" : : "m" (*gdt));
1471
1472 return boot_params;
1473fail:
1474 return NULL;
1475}