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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 <asm/efi.h>
12#include <asm/setup.h>
13#include <asm/desc.h>
14
15#include "eboot.h"
16
17static efi_system_table_t *sys_table;
18
19static void efi_printk(char *str)
20{
21 char *s8;
22
23 for (s8 = str; *s8; s8++) {
24 struct efi_simple_text_output_protocol *out;
25 efi_char16_t ch[2] = { 0 };
26
27 ch[0] = *s8;
28 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
29
30 if (*s8 == '\n') {
31 efi_char16_t nl[2] = { '\r', 0 };
32 efi_call_phys2(out->output_string, out, nl);
33 }
34
35 efi_call_phys2(out->output_string, out, ch);
36 }
37}
38
39static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
40 unsigned long *desc_size)
41{
42 efi_memory_desc_t *m = NULL;
43 efi_status_t status;
44 unsigned long key;
45 u32 desc_version;
46
47 *map_size = sizeof(*m) * 32;
48again:
49 /*
50 * Add an additional efi_memory_desc_t because we're doing an
51 * allocation which may be in a new descriptor region.
52 */
53 *map_size += sizeof(*m);
54 status = efi_call_phys3(sys_table->boottime->allocate_pool,
55 EFI_LOADER_DATA, *map_size, (void **)&m);
56 if (status != EFI_SUCCESS)
57 goto fail;
58
59 status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
60 m, &key, desc_size, &desc_version);
61 if (status == EFI_BUFFER_TOO_SMALL) {
62 efi_call_phys1(sys_table->boottime->free_pool, m);
63 goto again;
64 }
65
66 if (status != EFI_SUCCESS)
67 efi_call_phys1(sys_table->boottime->free_pool, m);
68
69fail:
70 *map = m;
71 return status;
72}
73
74/*
75 * Allocate at the highest possible address that is not above 'max'.
76 */
77static efi_status_t high_alloc(unsigned long size, unsigned long align,
78 unsigned long *addr, unsigned long max)
79{
80 unsigned long map_size, desc_size;
81 efi_memory_desc_t *map;
82 efi_status_t status;
83 unsigned long nr_pages;
84 u64 max_addr = 0;
85 int i;
86
87 status = __get_map(&map, &map_size, &desc_size);
88 if (status != EFI_SUCCESS)
89 goto fail;
90
91 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
92again:
93 for (i = 0; i < map_size / desc_size; i++) {
94 efi_memory_desc_t *desc;
95 unsigned long m = (unsigned long)map;
96 u64 start, end;
97
98 desc = (efi_memory_desc_t *)(m + (i * desc_size));
99 if (desc->type != EFI_CONVENTIONAL_MEMORY)
100 continue;
101
102 if (desc->num_pages < nr_pages)
103 continue;
104
105 start = desc->phys_addr;
106 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
107
108 if ((start + size) > end || (start + size) > max)
109 continue;
110
111 if (end - size > max)
112 end = max;
113
114 if (round_down(end - size, align) < start)
115 continue;
116
117 start = round_down(end - size, align);
118
119 /*
120 * Don't allocate at 0x0. It will confuse code that
121 * checks pointers against NULL.
122 */
123 if (start == 0x0)
124 continue;
125
126 if (start > max_addr)
127 max_addr = start;
128 }
129
130 if (!max_addr)
131 status = EFI_NOT_FOUND;
132 else {
133 status = efi_call_phys4(sys_table->boottime->allocate_pages,
134 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
135 nr_pages, &max_addr);
136 if (status != EFI_SUCCESS) {
137 max = max_addr;
138 max_addr = 0;
139 goto again;
140 }
141
142 *addr = max_addr;
143 }
144
145free_pool:
146 efi_call_phys1(sys_table->boottime->free_pool, map);
147
148fail:
149 return status;
150}
151
152/*
153 * Allocate at the lowest possible address.
154 */
155static efi_status_t low_alloc(unsigned long size, unsigned long align,
156 unsigned long *addr)
157{
158 unsigned long map_size, desc_size;
159 efi_memory_desc_t *map;
160 efi_status_t status;
161 unsigned long nr_pages;
162 int i;
163
164 status = __get_map(&map, &map_size, &desc_size);
165 if (status != EFI_SUCCESS)
166 goto fail;
167
168 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
169 for (i = 0; i < map_size / desc_size; i++) {
170 efi_memory_desc_t *desc;
171 unsigned long m = (unsigned long)map;
172 u64 start, end;
173
174 desc = (efi_memory_desc_t *)(m + (i * desc_size));
175
176 if (desc->type != EFI_CONVENTIONAL_MEMORY)
177 continue;
178
179 if (desc->num_pages < nr_pages)
180 continue;
181
182 start = desc->phys_addr;
183 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
184
185 /*
186 * Don't allocate at 0x0. It will confuse code that
187 * checks pointers against NULL. Skip the first 8
188 * bytes so we start at a nice even number.
189 */
190 if (start == 0x0)
191 start += 8;
192
193 start = round_up(start, align);
194 if ((start + size) > end)
195 continue;
196
197 status = efi_call_phys4(sys_table->boottime->allocate_pages,
198 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
199 nr_pages, &start);
200 if (status == EFI_SUCCESS) {
201 *addr = start;
202 break;
203 }
204 }
205
206 if (i == map_size / desc_size)
207 status = EFI_NOT_FOUND;
208
209free_pool:
210 efi_call_phys1(sys_table->boottime->free_pool, map);
211fail:
212 return status;
213}
214
215static void low_free(unsigned long size, unsigned long addr)
216{
217 unsigned long nr_pages;
218
219 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
220 efi_call_phys2(sys_table->boottime->free_pages, addr, size);
221}
222
223static void find_bits(unsigned long mask, u8 *pos, u8 *size)
224{
225 u8 first, len;
226
227 first = 0;
228 len = 0;
229
230 if (mask) {
231 while (!(mask & 0x1)) {
232 mask = mask >> 1;
233 first++;
234 }
235
236 while (mask & 0x1) {
237 mask = mask >> 1;
238 len++;
239 }
240 }
241
242 *pos = first;
243 *size = len;
244}
245
246/*
247 * See if we have Graphics Output Protocol
248 */
249static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
250 unsigned long size)
251{
252 struct efi_graphics_output_protocol *gop, *first_gop;
253 struct efi_pixel_bitmask pixel_info;
254 unsigned long nr_gops;
255 efi_status_t status;
256 void **gop_handle;
257 u16 width, height;
258 u32 fb_base, fb_size;
259 u32 pixels_per_scan_line;
260 int pixel_format;
261 int i;
262
263 status = efi_call_phys3(sys_table->boottime->allocate_pool,
264 EFI_LOADER_DATA, size, &gop_handle);
265 if (status != EFI_SUCCESS)
266 return status;
267
268 status = efi_call_phys5(sys_table->boottime->locate_handle,
269 EFI_LOCATE_BY_PROTOCOL, proto,
270 NULL, &size, gop_handle);
271 if (status != EFI_SUCCESS)
272 goto free_handle;
273
274 first_gop = NULL;
275
276 nr_gops = size / sizeof(void *);
277 for (i = 0; i < nr_gops; i++) {
278 struct efi_graphics_output_mode_info *info;
279 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
280 void *pciio;
281 void *h = gop_handle[i];
282
283 status = efi_call_phys3(sys_table->boottime->handle_protocol,
284 h, proto, &gop);
285 if (status != EFI_SUCCESS)
286 continue;
287
288 efi_call_phys3(sys_table->boottime->handle_protocol,
289 h, &pciio_proto, &pciio);
290
291 status = efi_call_phys4(gop->query_mode, gop,
292 gop->mode->mode, &size, &info);
293 if (status == EFI_SUCCESS && (!first_gop || pciio)) {
294 /*
295 * Apple provide GOPs that are not backed by
296 * real hardware (they're used to handle
297 * multiple displays). The workaround is to
298 * search for a GOP implementing the PCIIO
299 * protocol, and if one isn't found, to just
300 * fallback to the first GOP.
301 */
302 width = info->horizontal_resolution;
303 height = info->vertical_resolution;
304 fb_base = gop->mode->frame_buffer_base;
305 fb_size = gop->mode->frame_buffer_size;
306 pixel_format = info->pixel_format;
307 pixel_info = info->pixel_information;
308 pixels_per_scan_line = info->pixels_per_scan_line;
309
310 /*
311 * Once we've found a GOP supporting PCIIO,
312 * don't bother looking any further.
313 */
314 if (pciio)
315 break;
316
317 first_gop = gop;
318 }
319 }
320
321 /* Did we find any GOPs? */
322 if (!first_gop)
323 goto free_handle;
324
325 /* EFI framebuffer */
326 si->orig_video_isVGA = VIDEO_TYPE_EFI;
327
328 si->lfb_width = width;
329 si->lfb_height = height;
330 si->lfb_base = fb_base;
331 si->lfb_size = fb_size;
332 si->pages = 1;
333
334 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
335 si->lfb_depth = 32;
336 si->lfb_linelength = pixels_per_scan_line * 4;
337 si->red_size = 8;
338 si->red_pos = 0;
339 si->green_size = 8;
340 si->green_pos = 8;
341 si->blue_size = 8;
342 si->blue_pos = 16;
343 si->rsvd_size = 8;
344 si->rsvd_pos = 24;
345 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
346 si->lfb_depth = 32;
347 si->lfb_linelength = pixels_per_scan_line * 4;
348 si->red_size = 8;
349 si->red_pos = 16;
350 si->green_size = 8;
351 si->green_pos = 8;
352 si->blue_size = 8;
353 si->blue_pos = 0;
354 si->rsvd_size = 8;
355 si->rsvd_pos = 24;
356 } else if (pixel_format == PIXEL_BIT_MASK) {
357 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
358 find_bits(pixel_info.green_mask, &si->green_pos,
359 &si->green_size);
360 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
361 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
362 &si->rsvd_size);
363 si->lfb_depth = si->red_size + si->green_size +
364 si->blue_size + si->rsvd_size;
365 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
366 } else {
367 si->lfb_depth = 4;
368 si->lfb_linelength = si->lfb_width / 2;
369 si->red_size = 0;
370 si->red_pos = 0;
371 si->green_size = 0;
372 si->green_pos = 0;
373 si->blue_size = 0;
374 si->blue_pos = 0;
375 si->rsvd_size = 0;
376 si->rsvd_pos = 0;
377 }
378
379free_handle:
380 efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
381 return status;
382}
383
384/*
385 * See if we have Universal Graphics Adapter (UGA) protocol
386 */
387static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
388 unsigned long size)
389{
390 struct efi_uga_draw_protocol *uga, *first_uga;
391 unsigned long nr_ugas;
392 efi_status_t status;
393 u32 width, height;
394 void **uga_handle = NULL;
395 int i;
396
397 status = efi_call_phys3(sys_table->boottime->allocate_pool,
398 EFI_LOADER_DATA, size, &uga_handle);
399 if (status != EFI_SUCCESS)
400 return status;
401
402 status = efi_call_phys5(sys_table->boottime->locate_handle,
403 EFI_LOCATE_BY_PROTOCOL, uga_proto,
404 NULL, &size, uga_handle);
405 if (status != EFI_SUCCESS)
406 goto free_handle;
407
408 first_uga = NULL;
409
410 nr_ugas = size / sizeof(void *);
411 for (i = 0; i < nr_ugas; i++) {
412 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
413 void *handle = uga_handle[i];
414 u32 w, h, depth, refresh;
415 void *pciio;
416
417 status = efi_call_phys3(sys_table->boottime->handle_protocol,
418 handle, uga_proto, &uga);
419 if (status != EFI_SUCCESS)
420 continue;
421
422 efi_call_phys3(sys_table->boottime->handle_protocol,
423 handle, &pciio_proto, &pciio);
424
425 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
426 &depth, &refresh);
427 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
428 width = w;
429 height = h;
430
431 /*
432 * Once we've found a UGA supporting PCIIO,
433 * don't bother looking any further.
434 */
435 if (pciio)
436 break;
437
438 first_uga = uga;
439 }
440 }
441
442 if (!first_uga)
443 goto free_handle;
444
445 /* EFI framebuffer */
446 si->orig_video_isVGA = VIDEO_TYPE_EFI;
447
448 si->lfb_depth = 32;
449 si->lfb_width = width;
450 si->lfb_height = height;
451
452 si->red_size = 8;
453 si->red_pos = 16;
454 si->green_size = 8;
455 si->green_pos = 8;
456 si->blue_size = 8;
457 si->blue_pos = 0;
458 si->rsvd_size = 8;
459 si->rsvd_pos = 24;
460
461
462free_handle:
463 efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
464 return status;
465}
466
467void setup_graphics(struct boot_params *boot_params)
468{
469 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
470 struct screen_info *si;
471 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
472 efi_status_t status;
473 unsigned long size;
474 void **gop_handle = NULL;
475 void **uga_handle = NULL;
476
477 si = &boot_params->screen_info;
478 memset(si, 0, sizeof(*si));
479
480 size = 0;
481 status = efi_call_phys5(sys_table->boottime->locate_handle,
482 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
483 NULL, &size, gop_handle);
484 if (status == EFI_BUFFER_TOO_SMALL)
485 status = setup_gop(si, &graphics_proto, size);
486
487 if (status != EFI_SUCCESS) {
488 size = 0;
489 status = efi_call_phys5(sys_table->boottime->locate_handle,
490 EFI_LOCATE_BY_PROTOCOL, &uga_proto,
491 NULL, &size, uga_handle);
492 if (status == EFI_BUFFER_TOO_SMALL)
493 setup_uga(si, &uga_proto, size);
494 }
495}
496
497struct initrd {
498 efi_file_handle_t *handle;
499 u64 size;
500};
501
502/*
503 * Check the cmdline for a LILO-style initrd= arguments.
504 *
505 * We only support loading an initrd from the same filesystem as the
506 * kernel image.
507 */
508static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
509 struct setup_header *hdr)
510{
511 struct initrd *initrds;
512 unsigned long initrd_addr;
513 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
514 u64 initrd_total;
515 efi_file_io_interface_t *io;
516 efi_file_handle_t *fh;
517 efi_status_t status;
518 int nr_initrds;
519 char *str;
520 int i, j, k;
521
522 initrd_addr = 0;
523 initrd_total = 0;
524
525 str = (char *)(unsigned long)hdr->cmd_line_ptr;
526
527 j = 0; /* See close_handles */
528
529 if (!str || !*str)
530 return EFI_SUCCESS;
531
532 for (nr_initrds = 0; *str; nr_initrds++) {
533 str = strstr(str, "initrd=");
534 if (!str)
535 break;
536
537 str += 7;
538
539 /* Skip any leading slashes */
540 while (*str == '/' || *str == '\\')
541 str++;
542
543 while (*str && *str != ' ' && *str != '\n')
544 str++;
545 }
546
547 if (!nr_initrds)
548 return EFI_SUCCESS;
549
550 status = efi_call_phys3(sys_table->boottime->allocate_pool,
551 EFI_LOADER_DATA,
552 nr_initrds * sizeof(*initrds),
553 &initrds);
554 if (status != EFI_SUCCESS) {
555 efi_printk("Failed to alloc mem for initrds\n");
556 goto fail;
557 }
558
559 str = (char *)(unsigned long)hdr->cmd_line_ptr;
560 for (i = 0; i < nr_initrds; i++) {
561 struct initrd *initrd;
562 efi_file_handle_t *h;
563 efi_file_info_t *info;
564 efi_char16_t filename_16[256];
565 unsigned long info_sz;
566 efi_guid_t info_guid = EFI_FILE_INFO_ID;
567 efi_char16_t *p;
568 u64 file_sz;
569
570 str = strstr(str, "initrd=");
571 if (!str)
572 break;
573
574 str += 7;
575
576 initrd = &initrds[i];
577 p = filename_16;
578
579 /* Skip any leading slashes */
580 while (*str == '/' || *str == '\\')
581 str++;
582
583 while (*str && *str != ' ' && *str != '\n') {
584 if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
585 break;
586
587 *p++ = *str++;
588 }
589
590 *p = '\0';
591
592 /* Only open the volume once. */
593 if (!i) {
594 efi_boot_services_t *boottime;
595
596 boottime = sys_table->boottime;
597
598 status = efi_call_phys3(boottime->handle_protocol,
599 image->device_handle, &fs_proto, &io);
600 if (status != EFI_SUCCESS) {
601 efi_printk("Failed to handle fs_proto\n");
602 goto free_initrds;
603 }
604
605 status = efi_call_phys2(io->open_volume, io, &fh);
606 if (status != EFI_SUCCESS) {
607 efi_printk("Failed to open volume\n");
608 goto free_initrds;
609 }
610 }
611
612 status = efi_call_phys5(fh->open, fh, &h, filename_16,
613 EFI_FILE_MODE_READ, (u64)0);
614 if (status != EFI_SUCCESS) {
615 efi_printk("Failed to open initrd file\n");
616 goto close_handles;
617 }
618
619 initrd->handle = h;
620
621 info_sz = 0;
622 status = efi_call_phys4(h->get_info, h, &info_guid,
623 &info_sz, NULL);
624 if (status != EFI_BUFFER_TOO_SMALL) {
625 efi_printk("Failed to get initrd info size\n");
626 goto close_handles;
627 }
628
629grow:
630 status = efi_call_phys3(sys_table->boottime->allocate_pool,
631 EFI_LOADER_DATA, info_sz, &info);
632 if (status != EFI_SUCCESS) {
633 efi_printk("Failed to alloc mem for initrd info\n");
634 goto close_handles;
635 }
636
637 status = efi_call_phys4(h->get_info, h, &info_guid,
638 &info_sz, info);
639 if (status == EFI_BUFFER_TOO_SMALL) {
640 efi_call_phys1(sys_table->boottime->free_pool, info);
641 goto grow;
642 }
643
644 file_sz = info->file_size;
645 efi_call_phys1(sys_table->boottime->free_pool, info);
646
647 if (status != EFI_SUCCESS) {
648 efi_printk("Failed to get initrd info\n");
649 goto close_handles;
650 }
651
652 initrd->size = file_sz;
653 initrd_total += file_sz;
654 }
655
656 if (initrd_total) {
657 unsigned long addr;
658
659 /*
660 * Multiple initrd's need to be at consecutive
661 * addresses in memory, so allocate enough memory for
662 * all the initrd's.
663 */
664 status = high_alloc(initrd_total, 0x1000,
665 &initrd_addr, hdr->initrd_addr_max);
666 if (status != EFI_SUCCESS) {
667 efi_printk("Failed to alloc highmem for initrds\n");
668 goto close_handles;
669 }
670
671 /* We've run out of free low memory. */
672 if (initrd_addr > hdr->initrd_addr_max) {
673 efi_printk("We've run out of free low memory\n");
674 status = EFI_INVALID_PARAMETER;
675 goto free_initrd_total;
676 }
677
678 addr = initrd_addr;
679 for (j = 0; j < nr_initrds; j++) {
680 u64 size;
681
682 size = initrds[j].size;
683 while (size) {
684 u64 chunksize;
685 if (size > EFI_READ_CHUNK_SIZE)
686 chunksize = EFI_READ_CHUNK_SIZE;
687 else
688 chunksize = size;
689 status = efi_call_phys3(fh->read,
690 initrds[j].handle,
691 &chunksize, addr);
692 if (status != EFI_SUCCESS) {
693 efi_printk("Failed to read initrd\n");
694 goto free_initrd_total;
695 }
696 addr += chunksize;
697 size -= chunksize;
698 }
699
700 efi_call_phys1(fh->close, initrds[j].handle);
701 }
702
703 }
704
705 efi_call_phys1(sys_table->boottime->free_pool, initrds);
706
707 hdr->ramdisk_image = initrd_addr;
708 hdr->ramdisk_size = initrd_total;
709
710 return status;
711
712free_initrd_total:
713 low_free(initrd_total, initrd_addr);
714
715close_handles:
716 for (k = j; k < i; k++)
717 efi_call_phys1(fh->close, initrds[k].handle);
718free_initrds:
719 efi_call_phys1(sys_table->boottime->free_pool, initrds);
720fail:
721 hdr->ramdisk_image = 0;
722 hdr->ramdisk_size = 0;
723
724 return status;
725}
726
727/*
728 * Because the x86 boot code expects to be passed a boot_params we
729 * need to create one ourselves (usually the bootloader would create
730 * one for us).
731 */
732static efi_status_t make_boot_params(struct boot_params *boot_params,
733 efi_loaded_image_t *image,
734 void *handle)
735{
736 struct efi_info *efi = &boot_params->efi_info;
737 struct apm_bios_info *bi = &boot_params->apm_bios_info;
738 struct sys_desc_table *sdt = &boot_params->sys_desc_table;
739 struct e820entry *e820_map = &boot_params->e820_map[0];
740 struct e820entry *prev = NULL;
741 struct setup_header *hdr = &boot_params->hdr;
742 unsigned long size, key, desc_size, _size;
743 efi_memory_desc_t *mem_map;
744 void *options = image->load_options;
745 u32 load_options_size = image->load_options_size / 2; /* ASCII */
746 int options_size = 0;
747 efi_status_t status;
748 __u32 desc_version;
749 unsigned long cmdline;
750 u8 nr_entries;
751 u16 *s2;
752 u8 *s1;
753 int i;
754
755 hdr->type_of_loader = 0x21;
756
757 /* Convert unicode cmdline to ascii */
758 cmdline = 0;
759 s2 = (u16 *)options;
760
761 if (s2) {
762 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
763 s2++;
764 options_size++;
765 }
766
767 if (options_size) {
768 if (options_size > hdr->cmdline_size)
769 options_size = hdr->cmdline_size;
770
771 options_size++; /* NUL termination */
772
773 status = low_alloc(options_size, 1, &cmdline);
774 if (status != EFI_SUCCESS) {
775 efi_printk("Failed to alloc mem for cmdline\n");
776 goto fail;
777 }
778
779 s1 = (u8 *)(unsigned long)cmdline;
780 s2 = (u16 *)options;
781
782 for (i = 0; i < options_size - 1; i++)
783 *s1++ = *s2++;
784
785 *s1 = '\0';
786 }
787 }
788
789 hdr->cmd_line_ptr = cmdline;
790
791 hdr->ramdisk_image = 0;
792 hdr->ramdisk_size = 0;
793
794 status = handle_ramdisks(image, hdr);
795 if (status != EFI_SUCCESS)
796 goto free_cmdline;
797
798 setup_graphics(boot_params);
799
800 /* Clear APM BIOS info */
801 memset(bi, 0, sizeof(*bi));
802
803 memset(sdt, 0, sizeof(*sdt));
804
805 memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
806
807 size = sizeof(*mem_map) * 32;
808
809again:
810 size += sizeof(*mem_map);
811 _size = size;
812 status = low_alloc(size, 1, (unsigned long *)&mem_map);
813 if (status != EFI_SUCCESS)
814 goto free_cmdline;
815
816 status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
817 mem_map, &key, &desc_size, &desc_version);
818 if (status == EFI_BUFFER_TOO_SMALL) {
819 low_free(_size, (unsigned long)mem_map);
820 goto again;
821 }
822
823 if (status != EFI_SUCCESS)
824 goto free_mem_map;
825
826 efi->efi_systab = (unsigned long)sys_table;
827 efi->efi_memdesc_size = desc_size;
828 efi->efi_memdesc_version = desc_version;
829 efi->efi_memmap = (unsigned long)mem_map;
830 efi->efi_memmap_size = size;
831
832#ifdef CONFIG_X86_64
833 efi->efi_systab_hi = (unsigned long)sys_table >> 32;
834 efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
835#endif
836
837 /* Might as well exit boot services now */
838 status = efi_call_phys2(sys_table->boottime->exit_boot_services,
839 handle, key);
840 if (status != EFI_SUCCESS)
841 goto free_mem_map;
842
843 /* Historic? */
844 boot_params->alt_mem_k = 32 * 1024;
845
846 /*
847 * Convert the EFI memory map to E820.
848 */
849 nr_entries = 0;
850 for (i = 0; i < size / desc_size; i++) {
851 efi_memory_desc_t *d;
852 unsigned int e820_type = 0;
853 unsigned long m = (unsigned long)mem_map;
854
855 d = (efi_memory_desc_t *)(m + (i * desc_size));
856 switch (d->type) {
857 case EFI_RESERVED_TYPE:
858 case EFI_RUNTIME_SERVICES_CODE:
859 case EFI_RUNTIME_SERVICES_DATA:
860 case EFI_MEMORY_MAPPED_IO:
861 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
862 case EFI_PAL_CODE:
863 e820_type = E820_RESERVED;
864 break;
865
866 case EFI_UNUSABLE_MEMORY:
867 e820_type = E820_UNUSABLE;
868 break;
869
870 case EFI_ACPI_RECLAIM_MEMORY:
871 e820_type = E820_ACPI;
872 break;
873
874 case EFI_LOADER_CODE:
875 case EFI_LOADER_DATA:
876 case EFI_BOOT_SERVICES_CODE:
877 case EFI_BOOT_SERVICES_DATA:
878 case EFI_CONVENTIONAL_MEMORY:
879 e820_type = E820_RAM;
880 break;
881
882 case EFI_ACPI_MEMORY_NVS:
883 e820_type = E820_NVS;
884 break;
885
886 default:
887 continue;
888 }
889
890 /* Merge adjacent mappings */
891 if (prev && prev->type == e820_type &&
892 (prev->addr + prev->size) == d->phys_addr)
893 prev->size += d->num_pages << 12;
894 else {
895 e820_map->addr = d->phys_addr;
896 e820_map->size = d->num_pages << 12;
897 e820_map->type = e820_type;
898 prev = e820_map++;
899 nr_entries++;
900 }
901 }
902
903 boot_params->e820_entries = nr_entries;
904
905 return EFI_SUCCESS;
906
907free_mem_map:
908 low_free(_size, (unsigned long)mem_map);
909free_cmdline:
910 if (options_size)
911 low_free(options_size, hdr->cmd_line_ptr);
912fail:
913 return status;
914}
915
916/*
917 * On success we return a pointer to a boot_params structure, and NULL
918 * on failure.
919 */
920struct boot_params *efi_main(void *handle, efi_system_table_t *_table)
921{
922 struct boot_params *boot_params;
923 unsigned long start, nr_pages;
924 struct desc_ptr *gdt, *idt;
925 efi_loaded_image_t *image;
926 struct setup_header *hdr;
927 efi_status_t status;
928 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
929 struct desc_struct *desc;
930
931 sys_table = _table;
932
933 /* Check if we were booted by the EFI firmware */
934 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
935 goto fail;
936
937 status = efi_call_phys3(sys_table->boottime->handle_protocol,
938 handle, &proto, (void *)&image);
939 if (status != EFI_SUCCESS) {
940 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
941 goto fail;
942 }
943
944 status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
945 if (status != EFI_SUCCESS) {
946 efi_printk("Failed to alloc lowmem for boot params\n");
947 goto fail;
948 }
949
950 memset(boot_params, 0x0, 0x4000);
951
952 hdr = &boot_params->hdr;
953
954 /* Copy the second sector to boot_params */
955 memcpy(&hdr->jump, image->image_base + 512, 512);
956
957 /*
958 * Fill out some of the header fields ourselves because the
959 * EFI firmware loader doesn't load the first sector.
960 */
961 hdr->root_flags = 1;
962 hdr->vid_mode = 0xffff;
963 hdr->boot_flag = 0xAA55;
964
965 /*
966 * The EFI firmware loader could have placed the kernel image
967 * anywhere in memory, but the kernel has various restrictions
968 * on the max physical address it can run at. Attempt to move
969 * the kernel to boot_params.pref_address, or as low as
970 * possible.
971 */
972 start = hdr->pref_address;
973 nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
974
975 status = efi_call_phys4(sys_table->boottime->allocate_pages,
976 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
977 nr_pages, &start);
978 if (status != EFI_SUCCESS) {
979 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
980 &start);
981 if (status != EFI_SUCCESS) {
982 efi_printk("Failed to alloc mem for kernel\n");
983 goto fail;
984 }
985 }
986
987 hdr->code32_start = (__u32)start;
988 hdr->pref_address = (__u64)(unsigned long)image->image_base;
989
990 memcpy((void *)start, image->image_base, image->image_size);
991
992 status = efi_call_phys3(sys_table->boottime->allocate_pool,
993 EFI_LOADER_DATA, sizeof(*gdt),
994 (void **)&gdt);
995 if (status != EFI_SUCCESS) {
996 efi_printk("Failed to alloc mem for gdt structure\n");
997 goto fail;
998 }
999
1000 gdt->size = 0x800;
1001 status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1002 if (status != EFI_SUCCESS) {
1003 efi_printk("Failed to alloc mem for gdt\n");
1004 goto fail;
1005 }
1006
1007 status = efi_call_phys3(sys_table->boottime->allocate_pool,
1008 EFI_LOADER_DATA, sizeof(*idt),
1009 (void **)&idt);
1010 if (status != EFI_SUCCESS) {
1011 efi_printk("Failed to alloc mem for idt structure\n");
1012 goto fail;
1013 }
1014
1015 idt->size = 0;
1016 idt->address = 0;
1017
1018 status = make_boot_params(boot_params, image, handle);
1019 if (status != EFI_SUCCESS)
1020 goto fail;
1021
1022 memset((char *)gdt->address, 0x0, gdt->size);
1023 desc = (struct desc_struct *)gdt->address;
1024
1025 /* The first GDT is a dummy and the second is unused. */
1026 desc += 2;
1027
1028 desc->limit0 = 0xffff;
1029 desc->base0 = 0x0000;
1030 desc->base1 = 0x0000;
1031 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1032 desc->s = DESC_TYPE_CODE_DATA;
1033 desc->dpl = 0;
1034 desc->p = 1;
1035 desc->limit = 0xf;
1036 desc->avl = 0;
1037 desc->l = 0;
1038 desc->d = SEG_OP_SIZE_32BIT;
1039 desc->g = SEG_GRANULARITY_4KB;
1040 desc->base2 = 0x00;
1041
1042 desc++;
1043 desc->limit0 = 0xffff;
1044 desc->base0 = 0x0000;
1045 desc->base1 = 0x0000;
1046 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1047 desc->s = DESC_TYPE_CODE_DATA;
1048 desc->dpl = 0;
1049 desc->p = 1;
1050 desc->limit = 0xf;
1051 desc->avl = 0;
1052 desc->l = 0;
1053 desc->d = SEG_OP_SIZE_32BIT;
1054 desc->g = SEG_GRANULARITY_4KB;
1055 desc->base2 = 0x00;
1056
1057#ifdef CONFIG_X86_64
1058 /* Task segment value */
1059 desc++;
1060 desc->limit0 = 0x0000;
1061 desc->base0 = 0x0000;
1062 desc->base1 = 0x0000;
1063 desc->type = SEG_TYPE_TSS;
1064 desc->s = 0;
1065 desc->dpl = 0;
1066 desc->p = 1;
1067 desc->limit = 0x0;
1068 desc->avl = 0;
1069 desc->l = 0;
1070 desc->d = 0;
1071 desc->g = SEG_GRANULARITY_4KB;
1072 desc->base2 = 0x00;
1073#endif /* CONFIG_X86_64 */
1074
1075 asm volatile ("lidt %0" : : "m" (*idt));
1076 asm volatile ("lgdt %0" : : "m" (*gdt));
1077
1078 asm volatile("cli");
1079
1080 return boot_params;
1081fail:
1082 return NULL;
1083}