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efi: Add "efi_fake_mem" boot option
[mirror_ubuntu-disco-kernel.git] / arch / x86 / boot / compressed / eboot.c
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 #include "../string.h"
17 #include "eboot.h"
18
19 static efi_system_table_t *sys_table;
20
21 static struct efi_config *efi_early;
22
23 __pure const struct efi_config *__efi_early(void)
24 {
25 return efi_early;
26 }
27
28 #define BOOT_SERVICES(bits) \
29 static void setup_boot_services##bits(struct efi_config *c) \
30 { \
31 efi_system_table_##bits##_t *table; \
32 efi_boot_services_##bits##_t *bt; \
33 \
34 table = (typeof(table))sys_table; \
35 \
36 c->text_output = table->con_out; \
37 \
38 bt = (typeof(bt))(unsigned long)(table->boottime); \
39 \
40 c->allocate_pool = bt->allocate_pool; \
41 c->allocate_pages = bt->allocate_pages; \
42 c->get_memory_map = bt->get_memory_map; \
43 c->free_pool = bt->free_pool; \
44 c->free_pages = bt->free_pages; \
45 c->locate_handle = bt->locate_handle; \
46 c->handle_protocol = bt->handle_protocol; \
47 c->exit_boot_services = bt->exit_boot_services; \
48 }
49 BOOT_SERVICES(32);
50 BOOT_SERVICES(64);
51
52 void efi_char16_printk(efi_system_table_t *, efi_char16_t *);
53
54 static 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
83 grow:
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
107 static 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
136 grow:
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 }
159 efi_status_t
160 efi_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
169 efi_status_t
170 efi_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
187 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
200 static 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
226 static 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
252 efi_status_t
253 efi_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
261 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 out = (typeof(out))(unsigned long)efi_early->text_output;
273 func = (u64 *)output_string;
274
275 efi_early->call(*func, out, str);
276 } else {
277 struct efi_simple_text_output_protocol_32 *out;
278 u32 *func;
279
280 offset = offsetof(typeof(*out), output_string);
281 output_string = efi_early->text_output + offset;
282 out = (typeof(out))(unsigned long)efi_early->text_output;
283 func = (u32 *)output_string;
284
285 efi_early->call(*func, out, str);
286 }
287 }
288
289 static 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
312 static 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 efi_printk(sys_table, "Failed to alloc mem for rom\n");
334 return status;
335 }
336
337 memset(rom, 0, sizeof(*rom));
338
339 rom->data.type = SETUP_PCI;
340 rom->data.len = size - sizeof(struct setup_data);
341 rom->data.next = 0;
342 rom->pcilen = pci->romsize;
343 *__rom = rom;
344
345 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
346 PCI_VENDOR_ID, 1, &(rom->vendor));
347
348 if (status != EFI_SUCCESS) {
349 efi_printk(sys_table, "Failed to read rom->vendor\n");
350 goto free_struct;
351 }
352
353 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
354 PCI_DEVICE_ID, 1, &(rom->devid));
355
356 if (status != EFI_SUCCESS) {
357 efi_printk(sys_table, "Failed to read rom->devid\n");
358 goto free_struct;
359 }
360
361 status = efi_early->call(pci->get_location, pci, &(rom->segment),
362 &(rom->bus), &(rom->device), &(rom->function));
363
364 if (status != EFI_SUCCESS)
365 goto free_struct;
366
367 memcpy(rom->romdata, pci->romimage, pci->romsize);
368 return status;
369
370 free_struct:
371 efi_call_early(free_pool, rom);
372 return status;
373 }
374
375 static void
376 setup_efi_pci32(struct boot_params *params, void **pci_handle,
377 unsigned long size)
378 {
379 efi_pci_io_protocol_32 *pci = NULL;
380 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
381 u32 *handles = (u32 *)(unsigned long)pci_handle;
382 efi_status_t status;
383 unsigned long nr_pci;
384 struct setup_data *data;
385 int i;
386
387 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
388
389 while (data && data->next)
390 data = (struct setup_data *)(unsigned long)data->next;
391
392 nr_pci = size / sizeof(u32);
393 for (i = 0; i < nr_pci; i++) {
394 struct pci_setup_rom *rom = NULL;
395 u32 h = handles[i];
396
397 status = efi_call_early(handle_protocol, h,
398 &pci_proto, (void **)&pci);
399
400 if (status != EFI_SUCCESS)
401 continue;
402
403 if (!pci)
404 continue;
405
406 status = __setup_efi_pci32(pci, &rom);
407 if (status != EFI_SUCCESS)
408 continue;
409
410 if (data)
411 data->next = (unsigned long)rom;
412 else
413 params->hdr.setup_data = (unsigned long)rom;
414
415 data = (struct setup_data *)rom;
416
417 }
418 }
419
420 static efi_status_t
421 __setup_efi_pci64(efi_pci_io_protocol_64 *pci, struct pci_setup_rom **__rom)
422 {
423 struct pci_setup_rom *rom;
424 efi_status_t status;
425 unsigned long size;
426 uint64_t attributes;
427
428 status = efi_early->call(pci->attributes, pci,
429 EfiPciIoAttributeOperationGet, 0,
430 &attributes);
431 if (status != EFI_SUCCESS)
432 return status;
433
434 if (!pci->romimage || !pci->romsize)
435 return EFI_INVALID_PARAMETER;
436
437 size = pci->romsize + sizeof(*rom);
438
439 status = efi_call_early(allocate_pool, EFI_LOADER_DATA, size, &rom);
440 if (status != EFI_SUCCESS) {
441 efi_printk(sys_table, "Failed to alloc mem for rom\n");
442 return status;
443 }
444
445 rom->data.type = SETUP_PCI;
446 rom->data.len = size - sizeof(struct setup_data);
447 rom->data.next = 0;
448 rom->pcilen = pci->romsize;
449 *__rom = rom;
450
451 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
452 PCI_VENDOR_ID, 1, &(rom->vendor));
453
454 if (status != EFI_SUCCESS) {
455 efi_printk(sys_table, "Failed to read rom->vendor\n");
456 goto free_struct;
457 }
458
459 status = efi_early->call(pci->pci.read, pci, EfiPciIoWidthUint16,
460 PCI_DEVICE_ID, 1, &(rom->devid));
461
462 if (status != EFI_SUCCESS) {
463 efi_printk(sys_table, "Failed to read rom->devid\n");
464 goto free_struct;
465 }
466
467 status = efi_early->call(pci->get_location, pci, &(rom->segment),
468 &(rom->bus), &(rom->device), &(rom->function));
469
470 if (status != EFI_SUCCESS)
471 goto free_struct;
472
473 memcpy(rom->romdata, pci->romimage, pci->romsize);
474 return status;
475
476 free_struct:
477 efi_call_early(free_pool, rom);
478 return status;
479
480 }
481
482 static void
483 setup_efi_pci64(struct boot_params *params, void **pci_handle,
484 unsigned long size)
485 {
486 efi_pci_io_protocol_64 *pci = NULL;
487 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
488 u64 *handles = (u64 *)(unsigned long)pci_handle;
489 efi_status_t status;
490 unsigned long nr_pci;
491 struct setup_data *data;
492 int i;
493
494 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
495
496 while (data && data->next)
497 data = (struct setup_data *)(unsigned long)data->next;
498
499 nr_pci = size / sizeof(u64);
500 for (i = 0; i < nr_pci; i++) {
501 struct pci_setup_rom *rom = NULL;
502 u64 h = handles[i];
503
504 status = efi_call_early(handle_protocol, h,
505 &pci_proto, (void **)&pci);
506
507 if (status != EFI_SUCCESS)
508 continue;
509
510 if (!pci)
511 continue;
512
513 status = __setup_efi_pci64(pci, &rom);
514 if (status != EFI_SUCCESS)
515 continue;
516
517 if (data)
518 data->next = (unsigned long)rom;
519 else
520 params->hdr.setup_data = (unsigned long)rom;
521
522 data = (struct setup_data *)rom;
523
524 }
525 }
526
527 /*
528 * There's no way to return an informative status from this function,
529 * because any analysis (and printing of error messages) needs to be
530 * done directly at the EFI function call-site.
531 *
532 * For example, EFI_INVALID_PARAMETER could indicate a bug or maybe we
533 * just didn't find any PCI devices, but there's no way to tell outside
534 * the context of the call.
535 */
536 static void setup_efi_pci(struct boot_params *params)
537 {
538 efi_status_t status;
539 void **pci_handle = NULL;
540 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
541 unsigned long size = 0;
542
543 status = efi_call_early(locate_handle,
544 EFI_LOCATE_BY_PROTOCOL,
545 &pci_proto, NULL, &size, pci_handle);
546
547 if (status == EFI_BUFFER_TOO_SMALL) {
548 status = efi_call_early(allocate_pool,
549 EFI_LOADER_DATA,
550 size, (void **)&pci_handle);
551
552 if (status != EFI_SUCCESS) {
553 efi_printk(sys_table, "Failed to alloc mem for pci_handle\n");
554 return;
555 }
556
557 status = efi_call_early(locate_handle,
558 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
559 NULL, &size, pci_handle);
560 }
561
562 if (status != EFI_SUCCESS)
563 goto free_handle;
564
565 if (efi_early->is64)
566 setup_efi_pci64(params, pci_handle, size);
567 else
568 setup_efi_pci32(params, pci_handle, size);
569
570 free_handle:
571 efi_call_early(free_pool, pci_handle);
572 }
573
574 static void
575 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
576 struct efi_pixel_bitmask pixel_info, int pixel_format)
577 {
578 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
579 si->lfb_depth = 32;
580 si->lfb_linelength = pixels_per_scan_line * 4;
581 si->red_size = 8;
582 si->red_pos = 0;
583 si->green_size = 8;
584 si->green_pos = 8;
585 si->blue_size = 8;
586 si->blue_pos = 16;
587 si->rsvd_size = 8;
588 si->rsvd_pos = 24;
589 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
590 si->lfb_depth = 32;
591 si->lfb_linelength = pixels_per_scan_line * 4;
592 si->red_size = 8;
593 si->red_pos = 16;
594 si->green_size = 8;
595 si->green_pos = 8;
596 si->blue_size = 8;
597 si->blue_pos = 0;
598 si->rsvd_size = 8;
599 si->rsvd_pos = 24;
600 } else if (pixel_format == PIXEL_BIT_MASK) {
601 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
602 find_bits(pixel_info.green_mask, &si->green_pos,
603 &si->green_size);
604 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
605 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
606 &si->rsvd_size);
607 si->lfb_depth = si->red_size + si->green_size +
608 si->blue_size + si->rsvd_size;
609 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
610 } else {
611 si->lfb_depth = 4;
612 si->lfb_linelength = si->lfb_width / 2;
613 si->red_size = 0;
614 si->red_pos = 0;
615 si->green_size = 0;
616 si->green_pos = 0;
617 si->blue_size = 0;
618 si->blue_pos = 0;
619 si->rsvd_size = 0;
620 si->rsvd_pos = 0;
621 }
622 }
623
624 static efi_status_t
625 __gop_query32(struct efi_graphics_output_protocol_32 *gop32,
626 struct efi_graphics_output_mode_info **info,
627 unsigned long *size, u64 *fb_base)
628 {
629 struct efi_graphics_output_protocol_mode_32 *mode;
630 efi_status_t status;
631 unsigned long m;
632
633 m = gop32->mode;
634 mode = (struct efi_graphics_output_protocol_mode_32 *)m;
635
636 status = efi_early->call(gop32->query_mode, gop32,
637 mode->mode, size, info);
638 if (status != EFI_SUCCESS)
639 return status;
640
641 *fb_base = mode->frame_buffer_base;
642 return status;
643 }
644
645 static efi_status_t
646 setup_gop32(struct screen_info *si, efi_guid_t *proto,
647 unsigned long size, void **gop_handle)
648 {
649 struct efi_graphics_output_protocol_32 *gop32, *first_gop;
650 unsigned long nr_gops;
651 u16 width, height;
652 u32 pixels_per_scan_line;
653 u32 ext_lfb_base;
654 u64 fb_base;
655 struct efi_pixel_bitmask pixel_info;
656 int pixel_format;
657 efi_status_t status;
658 u32 *handles = (u32 *)(unsigned long)gop_handle;
659 int i;
660
661 first_gop = NULL;
662 gop32 = NULL;
663
664 nr_gops = size / sizeof(u32);
665 for (i = 0; i < nr_gops; i++) {
666 struct efi_graphics_output_mode_info *info = NULL;
667 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
668 bool conout_found = false;
669 void *dummy = NULL;
670 u32 h = handles[i];
671
672 status = efi_call_early(handle_protocol, h,
673 proto, (void **)&gop32);
674 if (status != EFI_SUCCESS)
675 continue;
676
677 status = efi_call_early(handle_protocol, h,
678 &conout_proto, &dummy);
679 if (status == EFI_SUCCESS)
680 conout_found = true;
681
682 status = __gop_query32(gop32, &info, &size, &fb_base);
683 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
684 /*
685 * Systems that use the UEFI Console Splitter may
686 * provide multiple GOP devices, not all of which are
687 * backed by real hardware. The workaround is to search
688 * for a GOP implementing the ConOut protocol, and if
689 * one isn't found, to just fall back to the first GOP.
690 */
691 width = info->horizontal_resolution;
692 height = info->vertical_resolution;
693 pixel_format = info->pixel_format;
694 pixel_info = info->pixel_information;
695 pixels_per_scan_line = info->pixels_per_scan_line;
696
697 /*
698 * Once we've found a GOP supporting ConOut,
699 * don't bother looking any further.
700 */
701 first_gop = gop32;
702 if (conout_found)
703 break;
704 }
705 }
706
707 /* Did we find any GOPs? */
708 if (!first_gop)
709 goto out;
710
711 /* EFI framebuffer */
712 si->orig_video_isVGA = VIDEO_TYPE_EFI;
713
714 si->lfb_width = width;
715 si->lfb_height = height;
716 si->lfb_base = fb_base;
717
718 ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
719 if (ext_lfb_base) {
720 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
721 si->ext_lfb_base = ext_lfb_base;
722 }
723
724 si->pages = 1;
725
726 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
727
728 si->lfb_size = si->lfb_linelength * si->lfb_height;
729
730 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
731 out:
732 return status;
733 }
734
735 static efi_status_t
736 __gop_query64(struct efi_graphics_output_protocol_64 *gop64,
737 struct efi_graphics_output_mode_info **info,
738 unsigned long *size, u64 *fb_base)
739 {
740 struct efi_graphics_output_protocol_mode_64 *mode;
741 efi_status_t status;
742 unsigned long m;
743
744 m = gop64->mode;
745 mode = (struct efi_graphics_output_protocol_mode_64 *)m;
746
747 status = efi_early->call(gop64->query_mode, gop64,
748 mode->mode, size, info);
749 if (status != EFI_SUCCESS)
750 return status;
751
752 *fb_base = mode->frame_buffer_base;
753 return status;
754 }
755
756 static efi_status_t
757 setup_gop64(struct screen_info *si, efi_guid_t *proto,
758 unsigned long size, void **gop_handle)
759 {
760 struct efi_graphics_output_protocol_64 *gop64, *first_gop;
761 unsigned long nr_gops;
762 u16 width, height;
763 u32 pixels_per_scan_line;
764 u32 ext_lfb_base;
765 u64 fb_base;
766 struct efi_pixel_bitmask pixel_info;
767 int pixel_format;
768 efi_status_t status;
769 u64 *handles = (u64 *)(unsigned long)gop_handle;
770 int i;
771
772 first_gop = NULL;
773 gop64 = NULL;
774
775 nr_gops = size / sizeof(u64);
776 for (i = 0; i < nr_gops; i++) {
777 struct efi_graphics_output_mode_info *info = NULL;
778 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
779 bool conout_found = false;
780 void *dummy = NULL;
781 u64 h = handles[i];
782
783 status = efi_call_early(handle_protocol, h,
784 proto, (void **)&gop64);
785 if (status != EFI_SUCCESS)
786 continue;
787
788 status = efi_call_early(handle_protocol, h,
789 &conout_proto, &dummy);
790 if (status == EFI_SUCCESS)
791 conout_found = true;
792
793 status = __gop_query64(gop64, &info, &size, &fb_base);
794 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
795 /*
796 * Systems that use the UEFI Console Splitter may
797 * provide multiple GOP devices, not all of which are
798 * backed by real hardware. The workaround is to search
799 * for a GOP implementing the ConOut protocol, and if
800 * one isn't found, to just fall back to the first GOP.
801 */
802 width = info->horizontal_resolution;
803 height = info->vertical_resolution;
804 pixel_format = info->pixel_format;
805 pixel_info = info->pixel_information;
806 pixels_per_scan_line = info->pixels_per_scan_line;
807
808 /*
809 * Once we've found a GOP supporting ConOut,
810 * don't bother looking any further.
811 */
812 first_gop = gop64;
813 if (conout_found)
814 break;
815 }
816 }
817
818 /* Did we find any GOPs? */
819 if (!first_gop)
820 goto out;
821
822 /* EFI framebuffer */
823 si->orig_video_isVGA = VIDEO_TYPE_EFI;
824
825 si->lfb_width = width;
826 si->lfb_height = height;
827 si->lfb_base = fb_base;
828
829 ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
830 if (ext_lfb_base) {
831 si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
832 si->ext_lfb_base = ext_lfb_base;
833 }
834
835 si->pages = 1;
836
837 setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
838
839 si->lfb_size = si->lfb_linelength * si->lfb_height;
840
841 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
842 out:
843 return status;
844 }
845
846 /*
847 * See if we have Graphics Output Protocol
848 */
849 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
850 unsigned long size)
851 {
852 efi_status_t status;
853 void **gop_handle = NULL;
854
855 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
856 size, (void **)&gop_handle);
857 if (status != EFI_SUCCESS)
858 return status;
859
860 status = efi_call_early(locate_handle,
861 EFI_LOCATE_BY_PROTOCOL,
862 proto, NULL, &size, gop_handle);
863 if (status != EFI_SUCCESS)
864 goto free_handle;
865
866 if (efi_early->is64)
867 status = setup_gop64(si, proto, size, gop_handle);
868 else
869 status = setup_gop32(si, proto, size, gop_handle);
870
871 free_handle:
872 efi_call_early(free_pool, gop_handle);
873 return status;
874 }
875
876 static efi_status_t
877 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
878 {
879 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
880 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
881 unsigned long nr_ugas;
882 u32 *handles = (u32 *)uga_handle;;
883 efi_status_t status;
884 int i;
885
886 first_uga = NULL;
887 nr_ugas = size / sizeof(u32);
888 for (i = 0; i < nr_ugas; i++) {
889 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
890 u32 w, h, depth, refresh;
891 void *pciio;
892 u32 handle = handles[i];
893
894 status = efi_call_early(handle_protocol, handle,
895 &uga_proto, (void **)&uga);
896 if (status != EFI_SUCCESS)
897 continue;
898
899 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
900
901 status = efi_early->call((unsigned long)uga->get_mode, uga,
902 &w, &h, &depth, &refresh);
903 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
904 *width = w;
905 *height = h;
906
907 /*
908 * Once we've found a UGA supporting PCIIO,
909 * don't bother looking any further.
910 */
911 if (pciio)
912 break;
913
914 first_uga = uga;
915 }
916 }
917
918 return status;
919 }
920
921 static efi_status_t
922 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
923 {
924 struct efi_uga_draw_protocol *uga = NULL, *first_uga;
925 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
926 unsigned long nr_ugas;
927 u64 *handles = (u64 *)uga_handle;;
928 efi_status_t status;
929 int i;
930
931 first_uga = NULL;
932 nr_ugas = size / sizeof(u64);
933 for (i = 0; i < nr_ugas; i++) {
934 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
935 u32 w, h, depth, refresh;
936 void *pciio;
937 u64 handle = handles[i];
938
939 status = efi_call_early(handle_protocol, handle,
940 &uga_proto, (void **)&uga);
941 if (status != EFI_SUCCESS)
942 continue;
943
944 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
945
946 status = efi_early->call((unsigned long)uga->get_mode, uga,
947 &w, &h, &depth, &refresh);
948 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
949 *width = w;
950 *height = h;
951
952 /*
953 * Once we've found a UGA supporting PCIIO,
954 * don't bother looking any further.
955 */
956 if (pciio)
957 break;
958
959 first_uga = uga;
960 }
961 }
962
963 return status;
964 }
965
966 /*
967 * See if we have Universal Graphics Adapter (UGA) protocol
968 */
969 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
970 unsigned long size)
971 {
972 efi_status_t status;
973 u32 width, height;
974 void **uga_handle = NULL;
975
976 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
977 size, (void **)&uga_handle);
978 if (status != EFI_SUCCESS)
979 return status;
980
981 status = efi_call_early(locate_handle,
982 EFI_LOCATE_BY_PROTOCOL,
983 uga_proto, NULL, &size, uga_handle);
984 if (status != EFI_SUCCESS)
985 goto free_handle;
986
987 height = 0;
988 width = 0;
989
990 if (efi_early->is64)
991 status = setup_uga64(uga_handle, size, &width, &height);
992 else
993 status = setup_uga32(uga_handle, size, &width, &height);
994
995 if (!width && !height)
996 goto free_handle;
997
998 /* EFI framebuffer */
999 si->orig_video_isVGA = VIDEO_TYPE_EFI;
1000
1001 si->lfb_depth = 32;
1002 si->lfb_width = width;
1003 si->lfb_height = height;
1004
1005 si->red_size = 8;
1006 si->red_pos = 16;
1007 si->green_size = 8;
1008 si->green_pos = 8;
1009 si->blue_size = 8;
1010 si->blue_pos = 0;
1011 si->rsvd_size = 8;
1012 si->rsvd_pos = 24;
1013
1014 free_handle:
1015 efi_call_early(free_pool, uga_handle);
1016 return status;
1017 }
1018
1019 void setup_graphics(struct boot_params *boot_params)
1020 {
1021 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
1022 struct screen_info *si;
1023 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
1024 efi_status_t status;
1025 unsigned long size;
1026 void **gop_handle = NULL;
1027 void **uga_handle = NULL;
1028
1029 si = &boot_params->screen_info;
1030 memset(si, 0, sizeof(*si));
1031
1032 size = 0;
1033 status = efi_call_early(locate_handle,
1034 EFI_LOCATE_BY_PROTOCOL,
1035 &graphics_proto, NULL, &size, gop_handle);
1036 if (status == EFI_BUFFER_TOO_SMALL)
1037 status = setup_gop(si, &graphics_proto, size);
1038
1039 if (status != EFI_SUCCESS) {
1040 size = 0;
1041 status = efi_call_early(locate_handle,
1042 EFI_LOCATE_BY_PROTOCOL,
1043 &uga_proto, NULL, &size, uga_handle);
1044 if (status == EFI_BUFFER_TOO_SMALL)
1045 setup_uga(si, &uga_proto, size);
1046 }
1047 }
1048
1049 /*
1050 * Because the x86 boot code expects to be passed a boot_params we
1051 * need to create one ourselves (usually the bootloader would create
1052 * one for us).
1053 *
1054 * The caller is responsible for filling out ->code32_start in the
1055 * returned boot_params.
1056 */
1057 struct boot_params *make_boot_params(struct efi_config *c)
1058 {
1059 struct boot_params *boot_params;
1060 struct sys_desc_table *sdt;
1061 struct apm_bios_info *bi;
1062 struct setup_header *hdr;
1063 struct efi_info *efi;
1064 efi_loaded_image_t *image;
1065 void *options, *handle;
1066 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1067 int options_size = 0;
1068 efi_status_t status;
1069 char *cmdline_ptr;
1070 u16 *s2;
1071 u8 *s1;
1072 int i;
1073 unsigned long ramdisk_addr;
1074 unsigned long ramdisk_size;
1075
1076 efi_early = c;
1077 sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1078 handle = (void *)(unsigned long)efi_early->image_handle;
1079
1080 /* Check if we were booted by the EFI firmware */
1081 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1082 return NULL;
1083
1084 if (efi_early->is64)
1085 setup_boot_services64(efi_early);
1086 else
1087 setup_boot_services32(efi_early);
1088
1089 status = efi_call_early(handle_protocol, handle,
1090 &proto, (void *)&image);
1091 if (status != EFI_SUCCESS) {
1092 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1093 return NULL;
1094 }
1095
1096 status = efi_low_alloc(sys_table, 0x4000, 1,
1097 (unsigned long *)&boot_params);
1098 if (status != EFI_SUCCESS) {
1099 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1100 return NULL;
1101 }
1102
1103 memset(boot_params, 0x0, 0x4000);
1104
1105 hdr = &boot_params->hdr;
1106 efi = &boot_params->efi_info;
1107 bi = &boot_params->apm_bios_info;
1108 sdt = &boot_params->sys_desc_table;
1109
1110 /* Copy the second sector to boot_params */
1111 memcpy(&hdr->jump, image->image_base + 512, 512);
1112
1113 /*
1114 * Fill out some of the header fields ourselves because the
1115 * EFI firmware loader doesn't load the first sector.
1116 */
1117 hdr->root_flags = 1;
1118 hdr->vid_mode = 0xffff;
1119 hdr->boot_flag = 0xAA55;
1120
1121 hdr->type_of_loader = 0x21;
1122
1123 /* Convert unicode cmdline to ascii */
1124 cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1125 if (!cmdline_ptr)
1126 goto fail;
1127 hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1128 /* Fill in upper bits of command line address, NOP on 32 bit */
1129 boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
1130
1131 hdr->ramdisk_image = 0;
1132 hdr->ramdisk_size = 0;
1133
1134 /* Clear APM BIOS info */
1135 memset(bi, 0, sizeof(*bi));
1136
1137 memset(sdt, 0, sizeof(*sdt));
1138
1139 status = efi_parse_options(cmdline_ptr);
1140 if (status != EFI_SUCCESS)
1141 goto fail2;
1142
1143 status = handle_cmdline_files(sys_table, image,
1144 (char *)(unsigned long)hdr->cmd_line_ptr,
1145 "initrd=", hdr->initrd_addr_max,
1146 &ramdisk_addr, &ramdisk_size);
1147
1148 if (status != EFI_SUCCESS &&
1149 hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
1150 efi_printk(sys_table, "Trying to load files to higher address\n");
1151 status = handle_cmdline_files(sys_table, image,
1152 (char *)(unsigned long)hdr->cmd_line_ptr,
1153 "initrd=", -1UL,
1154 &ramdisk_addr, &ramdisk_size);
1155 }
1156
1157 if (status != EFI_SUCCESS)
1158 goto fail2;
1159 hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
1160 hdr->ramdisk_size = ramdisk_size & 0xffffffff;
1161 boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
1162 boot_params->ext_ramdisk_size = (u64)ramdisk_size >> 32;
1163
1164 return boot_params;
1165 fail2:
1166 efi_free(sys_table, options_size, hdr->cmd_line_ptr);
1167 fail:
1168 efi_free(sys_table, 0x4000, (unsigned long)boot_params);
1169 return NULL;
1170 }
1171
1172 static void add_e820ext(struct boot_params *params,
1173 struct setup_data *e820ext, u32 nr_entries)
1174 {
1175 struct setup_data *data;
1176 efi_status_t status;
1177 unsigned long size;
1178
1179 e820ext->type = SETUP_E820_EXT;
1180 e820ext->len = nr_entries * sizeof(struct e820entry);
1181 e820ext->next = 0;
1182
1183 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
1184
1185 while (data && data->next)
1186 data = (struct setup_data *)(unsigned long)data->next;
1187
1188 if (data)
1189 data->next = (unsigned long)e820ext;
1190 else
1191 params->hdr.setup_data = (unsigned long)e820ext;
1192 }
1193
1194 static efi_status_t setup_e820(struct boot_params *params,
1195 struct setup_data *e820ext, u32 e820ext_size)
1196 {
1197 struct e820entry *e820_map = &params->e820_map[0];
1198 struct efi_info *efi = &params->efi_info;
1199 struct e820entry *prev = NULL;
1200 u32 nr_entries;
1201 u32 nr_desc;
1202 int i;
1203
1204 nr_entries = 0;
1205 nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
1206
1207 for (i = 0; i < nr_desc; i++) {
1208 efi_memory_desc_t *d;
1209 unsigned int e820_type = 0;
1210 unsigned long m = efi->efi_memmap;
1211
1212 #ifdef CONFIG_X86_64
1213 m |= (u64)efi->efi_memmap_hi << 32;
1214 #endif
1215
1216 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
1217 switch (d->type) {
1218 case EFI_RESERVED_TYPE:
1219 case EFI_RUNTIME_SERVICES_CODE:
1220 case EFI_RUNTIME_SERVICES_DATA:
1221 case EFI_MEMORY_MAPPED_IO:
1222 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1223 case EFI_PAL_CODE:
1224 e820_type = E820_RESERVED;
1225 break;
1226
1227 case EFI_UNUSABLE_MEMORY:
1228 e820_type = E820_UNUSABLE;
1229 break;
1230
1231 case EFI_ACPI_RECLAIM_MEMORY:
1232 e820_type = E820_ACPI;
1233 break;
1234
1235 case EFI_LOADER_CODE:
1236 case EFI_LOADER_DATA:
1237 case EFI_BOOT_SERVICES_CODE:
1238 case EFI_BOOT_SERVICES_DATA:
1239 case EFI_CONVENTIONAL_MEMORY:
1240 e820_type = E820_RAM;
1241 break;
1242
1243 case EFI_ACPI_MEMORY_NVS:
1244 e820_type = E820_NVS;
1245 break;
1246
1247 case EFI_PERSISTENT_MEMORY:
1248 e820_type = E820_PMEM;
1249 break;
1250
1251 default:
1252 continue;
1253 }
1254
1255 /* Merge adjacent mappings */
1256 if (prev && prev->type == e820_type &&
1257 (prev->addr + prev->size) == d->phys_addr) {
1258 prev->size += d->num_pages << 12;
1259 continue;
1260 }
1261
1262 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
1263 u32 need = (nr_desc - i) * sizeof(struct e820entry) +
1264 sizeof(struct setup_data);
1265
1266 if (!e820ext || e820ext_size < need)
1267 return EFI_BUFFER_TOO_SMALL;
1268
1269 /* boot_params map full, switch to e820 extended */
1270 e820_map = (struct e820entry *)e820ext->data;
1271 }
1272
1273 e820_map->addr = d->phys_addr;
1274 e820_map->size = d->num_pages << PAGE_SHIFT;
1275 e820_map->type = e820_type;
1276 prev = e820_map++;
1277 nr_entries++;
1278 }
1279
1280 if (nr_entries > ARRAY_SIZE(params->e820_map)) {
1281 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
1282
1283 add_e820ext(params, e820ext, nr_e820ext);
1284 nr_entries -= nr_e820ext;
1285 }
1286
1287 params->e820_entries = (u8)nr_entries;
1288
1289 return EFI_SUCCESS;
1290 }
1291
1292 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
1293 u32 *e820ext_size)
1294 {
1295 efi_status_t status;
1296 unsigned long size;
1297
1298 size = sizeof(struct setup_data) +
1299 sizeof(struct e820entry) * nr_desc;
1300
1301 if (*e820ext) {
1302 efi_call_early(free_pool, *e820ext);
1303 *e820ext = NULL;
1304 *e820ext_size = 0;
1305 }
1306
1307 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1308 size, (void **)e820ext);
1309 if (status == EFI_SUCCESS)
1310 *e820ext_size = size;
1311
1312 return status;
1313 }
1314
1315 static efi_status_t exit_boot(struct boot_params *boot_params,
1316 void *handle, bool is64)
1317 {
1318 struct efi_info *efi = &boot_params->efi_info;
1319 unsigned long map_sz, key, desc_size;
1320 efi_memory_desc_t *mem_map;
1321 struct setup_data *e820ext;
1322 const char *signature;
1323 __u32 e820ext_size;
1324 __u32 nr_desc, prev_nr_desc;
1325 efi_status_t status;
1326 __u32 desc_version;
1327 bool called_exit = false;
1328 u8 nr_entries;
1329 int i;
1330
1331 nr_desc = 0;
1332 e820ext = NULL;
1333 e820ext_size = 0;
1334
1335 get_map:
1336 status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
1337 &desc_version, &key);
1338
1339 if (status != EFI_SUCCESS)
1340 return status;
1341
1342 prev_nr_desc = nr_desc;
1343 nr_desc = map_sz / desc_size;
1344 if (nr_desc > prev_nr_desc &&
1345 nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1346 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1347
1348 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1349 if (status != EFI_SUCCESS)
1350 goto free_mem_map;
1351
1352 efi_call_early(free_pool, mem_map);
1353 goto get_map; /* Allocated memory, get map again */
1354 }
1355
1356 signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1357 memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1358
1359 efi->efi_systab = (unsigned long)sys_table;
1360 efi->efi_memdesc_size = desc_size;
1361 efi->efi_memdesc_version = desc_version;
1362 efi->efi_memmap = (unsigned long)mem_map;
1363 efi->efi_memmap_size = map_sz;
1364
1365 #ifdef CONFIG_X86_64
1366 efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1367 efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1368 #endif
1369
1370 /* Might as well exit boot services now */
1371 status = efi_call_early(exit_boot_services, handle, key);
1372 if (status != EFI_SUCCESS) {
1373 /*
1374 * ExitBootServices() will fail if any of the event
1375 * handlers change the memory map. In which case, we
1376 * must be prepared to retry, but only once so that
1377 * we're guaranteed to exit on repeated failures instead
1378 * of spinning forever.
1379 */
1380 if (called_exit)
1381 goto free_mem_map;
1382
1383 called_exit = true;
1384 efi_call_early(free_pool, mem_map);
1385 goto get_map;
1386 }
1387
1388 /* Historic? */
1389 boot_params->alt_mem_k = 32 * 1024;
1390
1391 status = setup_e820(boot_params, e820ext, e820ext_size);
1392 if (status != EFI_SUCCESS)
1393 return status;
1394
1395 return EFI_SUCCESS;
1396
1397 free_mem_map:
1398 efi_call_early(free_pool, mem_map);
1399 return status;
1400 }
1401
1402 /*
1403 * On success we return a pointer to a boot_params structure, and NULL
1404 * on failure.
1405 */
1406 struct boot_params *efi_main(struct efi_config *c,
1407 struct boot_params *boot_params)
1408 {
1409 struct desc_ptr *gdt = NULL;
1410 efi_loaded_image_t *image;
1411 struct setup_header *hdr = &boot_params->hdr;
1412 efi_status_t status;
1413 struct desc_struct *desc;
1414 void *handle;
1415 efi_system_table_t *_table;
1416 bool is64;
1417
1418 efi_early = c;
1419
1420 _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1421 handle = (void *)(unsigned long)efi_early->image_handle;
1422 is64 = efi_early->is64;
1423
1424 sys_table = _table;
1425
1426 /* Check if we were booted by the EFI firmware */
1427 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1428 goto fail;
1429
1430 if (is64)
1431 setup_boot_services64(efi_early);
1432 else
1433 setup_boot_services32(efi_early);
1434
1435 setup_graphics(boot_params);
1436
1437 setup_efi_pci(boot_params);
1438
1439 status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1440 sizeof(*gdt), (void **)&gdt);
1441 if (status != EFI_SUCCESS) {
1442 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1443 goto fail;
1444 }
1445
1446 gdt->size = 0x800;
1447 status = efi_low_alloc(sys_table, gdt->size, 8,
1448 (unsigned long *)&gdt->address);
1449 if (status != EFI_SUCCESS) {
1450 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1451 goto fail;
1452 }
1453
1454 /*
1455 * If the kernel isn't already loaded at the preferred load
1456 * address, relocate it.
1457 */
1458 if (hdr->pref_address != hdr->code32_start) {
1459 unsigned long bzimage_addr = hdr->code32_start;
1460 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1461 hdr->init_size, hdr->init_size,
1462 hdr->pref_address,
1463 hdr->kernel_alignment);
1464 if (status != EFI_SUCCESS) {
1465 efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1466 goto fail;
1467 }
1468
1469 hdr->pref_address = hdr->code32_start;
1470 hdr->code32_start = bzimage_addr;
1471 }
1472
1473 status = exit_boot(boot_params, handle, is64);
1474 if (status != EFI_SUCCESS) {
1475 efi_printk(sys_table, "exit_boot() failed!\n");
1476 goto fail;
1477 }
1478
1479 memset((char *)gdt->address, 0x0, gdt->size);
1480 desc = (struct desc_struct *)gdt->address;
1481
1482 /* The first GDT is a dummy and the second is unused. */
1483 desc += 2;
1484
1485 desc->limit0 = 0xffff;
1486 desc->base0 = 0x0000;
1487 desc->base1 = 0x0000;
1488 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1489 desc->s = DESC_TYPE_CODE_DATA;
1490 desc->dpl = 0;
1491 desc->p = 1;
1492 desc->limit = 0xf;
1493 desc->avl = 0;
1494 desc->l = 0;
1495 desc->d = SEG_OP_SIZE_32BIT;
1496 desc->g = SEG_GRANULARITY_4KB;
1497 desc->base2 = 0x00;
1498
1499 desc++;
1500 desc->limit0 = 0xffff;
1501 desc->base0 = 0x0000;
1502 desc->base1 = 0x0000;
1503 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1504 desc->s = DESC_TYPE_CODE_DATA;
1505 desc->dpl = 0;
1506 desc->p = 1;
1507 desc->limit = 0xf;
1508 desc->avl = 0;
1509 desc->l = 0;
1510 desc->d = SEG_OP_SIZE_32BIT;
1511 desc->g = SEG_GRANULARITY_4KB;
1512 desc->base2 = 0x00;
1513
1514 #ifdef CONFIG_X86_64
1515 /* Task segment value */
1516 desc++;
1517 desc->limit0 = 0x0000;
1518 desc->base0 = 0x0000;
1519 desc->base1 = 0x0000;
1520 desc->type = SEG_TYPE_TSS;
1521 desc->s = 0;
1522 desc->dpl = 0;
1523 desc->p = 1;
1524 desc->limit = 0x0;
1525 desc->avl = 0;
1526 desc->l = 0;
1527 desc->d = 0;
1528 desc->g = SEG_GRANULARITY_4KB;
1529 desc->base2 = 0x00;
1530 #endif /* CONFIG_X86_64 */
1531
1532 asm volatile("cli");
1533 asm volatile ("lgdt %0" : : "m" (*gdt));
1534
1535 return boot_params;
1536 fail:
1537 efi_printk(sys_table, "efi_main() failed!\n");
1538 return NULL;
1539 }
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