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TOMOYO Linux Cross Reference
Linux/arch/x86/boot/compressed/eboot.c

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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 #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, u32 *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 fb_base;
654         struct efi_pixel_bitmask pixel_info;
655         int pixel_format;
656         efi_status_t status;
657         u32 *handles = (u32 *)(unsigned long)gop_handle;
658         int i;
659 
660         first_gop = NULL;
661         gop32 = NULL;
662 
663         nr_gops = size / sizeof(u32);
664         for (i = 0; i < nr_gops; i++) {
665                 struct efi_graphics_output_mode_info *info = NULL;
666                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
667                 bool conout_found = false;
668                 void *dummy = NULL;
669                 u32 h = handles[i];
670                 u32 current_fb_base;
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, &current_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                         fb_base = current_fb_base;
697 
698                         /*
699                          * Once we've found a GOP supporting ConOut,
700                          * don't bother looking any further.
701                          */
702                         first_gop = gop32;
703                         if (conout_found)
704                                 break;
705                 }
706         }
707 
708         /* Did we find any GOPs? */
709         if (!first_gop)
710                 goto out;
711 
712         /* EFI framebuffer */
713         si->orig_video_isVGA = VIDEO_TYPE_EFI;
714 
715         si->lfb_width = width;
716         si->lfb_height = height;
717         si->lfb_base = fb_base;
718         si->pages = 1;
719 
720         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
721 
722         si->lfb_size = si->lfb_linelength * si->lfb_height;
723 
724         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
725 out:
726         return status;
727 }
728 
729 static efi_status_t
730 __gop_query64(struct efi_graphics_output_protocol_64 *gop64,
731               struct efi_graphics_output_mode_info **info,
732               unsigned long *size, u32 *fb_base)
733 {
734         struct efi_graphics_output_protocol_mode_64 *mode;
735         efi_status_t status;
736         unsigned long m;
737 
738         m = gop64->mode;
739         mode = (struct efi_graphics_output_protocol_mode_64 *)m;
740 
741         status = efi_early->call(gop64->query_mode, gop64,
742                                  mode->mode, size, info);
743         if (status != EFI_SUCCESS)
744                 return status;
745 
746         *fb_base = mode->frame_buffer_base;
747         return status;
748 }
749 
750 static efi_status_t
751 setup_gop64(struct screen_info *si, efi_guid_t *proto,
752             unsigned long size, void **gop_handle)
753 {
754         struct efi_graphics_output_protocol_64 *gop64, *first_gop;
755         unsigned long nr_gops;
756         u16 width, height;
757         u32 pixels_per_scan_line;
758         u32 fb_base;
759         struct efi_pixel_bitmask pixel_info;
760         int pixel_format;
761         efi_status_t status;
762         u64 *handles = (u64 *)(unsigned long)gop_handle;
763         int i;
764 
765         first_gop = NULL;
766         gop64 = NULL;
767 
768         nr_gops = size / sizeof(u64);
769         for (i = 0; i < nr_gops; i++) {
770                 struct efi_graphics_output_mode_info *info = NULL;
771                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
772                 bool conout_found = false;
773                 void *dummy = NULL;
774                 u64 h = handles[i];
775                 u32 current_fb_base;
776 
777                 status = efi_call_early(handle_protocol, h,
778                                         proto, (void **)&gop64);
779                 if (status != EFI_SUCCESS)
780                         continue;
781 
782                 status = efi_call_early(handle_protocol, h,
783                                         &conout_proto, &dummy);
784                 if (status == EFI_SUCCESS)
785                         conout_found = true;
786 
787                 status = __gop_query64(gop64, &info, &size, &current_fb_base);
788                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
789                         /*
790                          * Systems that use the UEFI Console Splitter may
791                          * provide multiple GOP devices, not all of which are
792                          * backed by real hardware. The workaround is to search
793                          * for a GOP implementing the ConOut protocol, and if
794                          * one isn't found, to just fall back to the first GOP.
795                          */
796                         width = info->horizontal_resolution;
797                         height = info->vertical_resolution;
798                         pixel_format = info->pixel_format;
799                         pixel_info = info->pixel_information;
800                         pixels_per_scan_line = info->pixels_per_scan_line;
801                         fb_base = current_fb_base;
802 
803                         /*
804                          * Once we've found a GOP supporting ConOut,
805                          * don't bother looking any further.
806                          */
807                         first_gop = gop64;
808                         if (conout_found)
809                                 break;
810                 }
811         }
812 
813         /* Did we find any GOPs? */
814         if (!first_gop)
815                 goto out;
816 
817         /* EFI framebuffer */
818         si->orig_video_isVGA = VIDEO_TYPE_EFI;
819 
820         si->lfb_width = width;
821         si->lfb_height = height;
822         si->lfb_base = fb_base;
823         si->pages = 1;
824 
825         setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
826 
827         si->lfb_size = si->lfb_linelength * si->lfb_height;
828 
829         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
830 out:
831         return status;
832 }
833 
834 /*
835  * See if we have Graphics Output Protocol
836  */
837 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
838                               unsigned long size)
839 {
840         efi_status_t status;
841         void **gop_handle = NULL;
842 
843         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
844                                 size, (void **)&gop_handle);
845         if (status != EFI_SUCCESS)
846                 return status;
847 
848         status = efi_call_early(locate_handle,
849                                 EFI_LOCATE_BY_PROTOCOL,
850                                 proto, NULL, &size, gop_handle);
851         if (status != EFI_SUCCESS)
852                 goto free_handle;
853 
854         if (efi_early->is64)
855                 status = setup_gop64(si, proto, size, gop_handle);
856         else
857                 status = setup_gop32(si, proto, size, gop_handle);
858 
859 free_handle:
860         efi_call_early(free_pool, gop_handle);
861         return status;
862 }
863 
864 static efi_status_t
865 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
866 {
867         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
868         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
869         unsigned long nr_ugas;
870         u32 *handles = (u32 *)uga_handle;;
871         efi_status_t status;
872         int i;
873 
874         first_uga = NULL;
875         nr_ugas = size / sizeof(u32);
876         for (i = 0; i < nr_ugas; i++) {
877                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
878                 u32 w, h, depth, refresh;
879                 void *pciio;
880                 u32 handle = handles[i];
881 
882                 status = efi_call_early(handle_protocol, handle,
883                                         &uga_proto, (void **)&uga);
884                 if (status != EFI_SUCCESS)
885                         continue;
886 
887                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
888 
889                 status = efi_early->call((unsigned long)uga->get_mode, uga,
890                                          &w, &h, &depth, &refresh);
891                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
892                         *width = w;
893                         *height = h;
894 
895                         /*
896                          * Once we've found a UGA supporting PCIIO,
897                          * don't bother looking any further.
898                          */
899                         if (pciio)
900                                 break;
901 
902                         first_uga = uga;
903                 }
904         }
905 
906         return status;
907 }
908 
909 static efi_status_t
910 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
911 {
912         struct efi_uga_draw_protocol *uga = NULL, *first_uga;
913         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
914         unsigned long nr_ugas;
915         u64 *handles = (u64 *)uga_handle;;
916         efi_status_t status;
917         int i;
918 
919         first_uga = NULL;
920         nr_ugas = size / sizeof(u64);
921         for (i = 0; i < nr_ugas; i++) {
922                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
923                 u32 w, h, depth, refresh;
924                 void *pciio;
925                 u64 handle = handles[i];
926 
927                 status = efi_call_early(handle_protocol, handle,
928                                         &uga_proto, (void **)&uga);
929                 if (status != EFI_SUCCESS)
930                         continue;
931 
932                 efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
933 
934                 status = efi_early->call((unsigned long)uga->get_mode, uga,
935                                          &w, &h, &depth, &refresh);
936                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
937                         *width = w;
938                         *height = h;
939 
940                         /*
941                          * Once we've found a UGA supporting PCIIO,
942                          * don't bother looking any further.
943                          */
944                         if (pciio)
945                                 break;
946 
947                         first_uga = uga;
948                 }
949         }
950 
951         return status;
952 }
953 
954 /*
955  * See if we have Universal Graphics Adapter (UGA) protocol
956  */
957 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
958                               unsigned long size)
959 {
960         efi_status_t status;
961         u32 width, height;
962         void **uga_handle = NULL;
963 
964         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
965                                 size, (void **)&uga_handle);
966         if (status != EFI_SUCCESS)
967                 return status;
968 
969         status = efi_call_early(locate_handle,
970                                 EFI_LOCATE_BY_PROTOCOL,
971                                 uga_proto, NULL, &size, uga_handle);
972         if (status != EFI_SUCCESS)
973                 goto free_handle;
974 
975         height = 0;
976         width = 0;
977 
978         if (efi_early->is64)
979                 status = setup_uga64(uga_handle, size, &width, &height);
980         else
981                 status = setup_uga32(uga_handle, size, &width, &height);
982 
983         if (!width && !height)
984                 goto free_handle;
985 
986         /* EFI framebuffer */
987         si->orig_video_isVGA = VIDEO_TYPE_EFI;
988 
989         si->lfb_depth = 32;
990         si->lfb_width = width;
991         si->lfb_height = height;
992 
993         si->red_size = 8;
994         si->red_pos = 16;
995         si->green_size = 8;
996         si->green_pos = 8;
997         si->blue_size = 8;
998         si->blue_pos = 0;
999         si->rsvd_size = 8;
1000         si->rsvd_pos = 24;
1001 
1002 free_handle:
1003         efi_call_early(free_pool, uga_handle);
1004         return status;
1005 }
1006 
1007 void setup_graphics(struct boot_params *boot_params)
1008 {
1009         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
1010         struct screen_info *si;
1011         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
1012         efi_status_t status;
1013         unsigned long size;
1014         void **gop_handle = NULL;
1015         void **uga_handle = NULL;
1016 
1017         si = &boot_params->screen_info;
1018         memset(si, 0, sizeof(*si));
1019 
1020         size = 0;
1021         status = efi_call_early(locate_handle,
1022                                 EFI_LOCATE_BY_PROTOCOL,
1023                                 &graphics_proto, NULL, &size, gop_handle);
1024         if (status == EFI_BUFFER_TOO_SMALL)
1025                 status = setup_gop(si, &graphics_proto, size);
1026 
1027         if (status != EFI_SUCCESS) {
1028                 size = 0;
1029                 status = efi_call_early(locate_handle,
1030                                         EFI_LOCATE_BY_PROTOCOL,
1031                                         &uga_proto, NULL, &size, uga_handle);
1032                 if (status == EFI_BUFFER_TOO_SMALL)
1033                         setup_uga(si, &uga_proto, size);
1034         }
1035 }
1036 
1037 /*
1038  * Because the x86 boot code expects to be passed a boot_params we
1039  * need to create one ourselves (usually the bootloader would create
1040  * one for us).
1041  *
1042  * The caller is responsible for filling out ->code32_start in the
1043  * returned boot_params.
1044  */
1045 struct boot_params *make_boot_params(struct efi_config *c)
1046 {
1047         struct boot_params *boot_params;
1048         struct apm_bios_info *bi;
1049         struct setup_header *hdr;
1050         struct efi_info *efi;
1051         efi_loaded_image_t *image;
1052         void *options, *handle;
1053         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1054         int options_size = 0;
1055         efi_status_t status;
1056         char *cmdline_ptr;
1057         u16 *s2;
1058         u8 *s1;
1059         int i;
1060         unsigned long ramdisk_addr;
1061         unsigned long ramdisk_size;
1062 
1063         efi_early = c;
1064         sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1065         handle = (void *)(unsigned long)efi_early->image_handle;
1066 
1067         /* Check if we were booted by the EFI firmware */
1068         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1069                 return NULL;
1070 
1071         if (efi_early->is64)
1072                 setup_boot_services64(efi_early);
1073         else
1074                 setup_boot_services32(efi_early);
1075 
1076         status = efi_call_early(handle_protocol, handle,
1077                                 &proto, (void *)&image);
1078         if (status != EFI_SUCCESS) {
1079                 efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1080                 return NULL;
1081         }
1082 
1083         status = efi_low_alloc(sys_table, 0x4000, 1,
1084                                (unsigned long *)&boot_params);
1085         if (status != EFI_SUCCESS) {
1086                 efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1087                 return NULL;
1088         }
1089 
1090         memset(boot_params, 0x0, 0x4000);
1091 
1092         hdr = &boot_params->hdr;
1093         efi = &boot_params->efi_info;
1094         bi = &boot_params->apm_bios_info;
1095 
1096         /* Copy the second sector to boot_params */
1097         memcpy(&hdr->jump, image->image_base + 512, 512);
1098 
1099         /*
1100          * Fill out some of the header fields ourselves because the
1101          * EFI firmware loader doesn't load the first sector.
1102          */
1103         hdr->root_flags = 1;
1104         hdr->vid_mode = 0xffff;
1105         hdr->boot_flag = 0xAA55;
1106 
1107         hdr->type_of_loader = 0x21;
1108 
1109         /* Convert unicode cmdline to ascii */
1110         cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1111         if (!cmdline_ptr)
1112                 goto fail;
1113         hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1114         /* Fill in upper bits of command line address, NOP on 32 bit  */
1115         boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
1116 
1117         hdr->ramdisk_image = 0;
1118         hdr->ramdisk_size = 0;
1119 
1120         /* Clear APM BIOS info */
1121         memset(bi, 0, sizeof(*bi));
1122 
1123         status = efi_parse_options(cmdline_ptr);
1124         if (status != EFI_SUCCESS)
1125                 goto fail2;
1126 
1127         status = handle_cmdline_files(sys_table, image,
1128                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1129                                       "initrd=", hdr->initrd_addr_max,
1130                                       &ramdisk_addr, &ramdisk_size);
1131 
1132         if (status != EFI_SUCCESS &&
1133             hdr->xloadflags & XLF_CAN_BE_LOADED_ABOVE_4G) {
1134                 efi_printk(sys_table, "Trying to load files to higher address\n");
1135                 status = handle_cmdline_files(sys_table, image,
1136                                       (char *)(unsigned long)hdr->cmd_line_ptr,
1137                                       "initrd=", -1UL,
1138                                       &ramdisk_addr, &ramdisk_size);
1139         }
1140 
1141         if (status != EFI_SUCCESS)
1142                 goto fail2;
1143         hdr->ramdisk_image = ramdisk_addr & 0xffffffff;
1144         hdr->ramdisk_size  = ramdisk_size & 0xffffffff;
1145         boot_params->ext_ramdisk_image = (u64)ramdisk_addr >> 32;
1146         boot_params->ext_ramdisk_size  = (u64)ramdisk_size >> 32;
1147 
1148         return boot_params;
1149 fail2:
1150         efi_free(sys_table, options_size, hdr->cmd_line_ptr);
1151 fail:
1152         efi_free(sys_table, 0x4000, (unsigned long)boot_params);
1153         return NULL;
1154 }
1155 
1156 static void add_e820ext(struct boot_params *params,
1157                         struct setup_data *e820ext, u32 nr_entries)
1158 {
1159         struct setup_data *data;
1160         efi_status_t status;
1161         unsigned long size;
1162 
1163         e820ext->type = SETUP_E820_EXT;
1164         e820ext->len = nr_entries * sizeof(struct e820entry);
1165         e820ext->next = 0;
1166 
1167         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
1168 
1169         while (data && data->next)
1170                 data = (struct setup_data *)(unsigned long)data->next;
1171 
1172         if (data)
1173                 data->next = (unsigned long)e820ext;
1174         else
1175                 params->hdr.setup_data = (unsigned long)e820ext;
1176 }
1177 
1178 static efi_status_t setup_e820(struct boot_params *params,
1179                                struct setup_data *e820ext, u32 e820ext_size)
1180 {
1181         struct e820entry *e820_map = &params->e820_map[0];
1182         struct efi_info *efi = &params->efi_info;
1183         struct e820entry *prev = NULL;
1184         u32 nr_entries;
1185         u32 nr_desc;
1186         int i;
1187 
1188         nr_entries = 0;
1189         nr_desc = efi->efi_memmap_size / efi->efi_memdesc_size;
1190 
1191         for (i = 0; i < nr_desc; i++) {
1192                 efi_memory_desc_t *d;
1193                 unsigned int e820_type = 0;
1194                 unsigned long m = efi->efi_memmap;
1195 
1196 #ifdef CONFIG_X86_64
1197                 m |= (u64)efi->efi_memmap_hi << 32;
1198 #endif
1199 
1200                 d = (efi_memory_desc_t *)(m + (i * efi->efi_memdesc_size));
1201                 switch (d->type) {
1202                 case EFI_RESERVED_TYPE:
1203                 case EFI_RUNTIME_SERVICES_CODE:
1204                 case EFI_RUNTIME_SERVICES_DATA:
1205                 case EFI_MEMORY_MAPPED_IO:
1206                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1207                 case EFI_PAL_CODE:
1208                         e820_type = E820_RESERVED;
1209                         break;
1210 
1211                 case EFI_UNUSABLE_MEMORY:
1212                         e820_type = E820_UNUSABLE;
1213                         break;
1214 
1215                 case EFI_ACPI_RECLAIM_MEMORY:
1216                         e820_type = E820_ACPI;
1217                         break;
1218 
1219                 case EFI_LOADER_CODE:
1220                 case EFI_LOADER_DATA:
1221                 case EFI_BOOT_SERVICES_CODE:
1222                 case EFI_BOOT_SERVICES_DATA:
1223                 case EFI_CONVENTIONAL_MEMORY:
1224                         e820_type = E820_RAM;
1225                         break;
1226 
1227                 case EFI_ACPI_MEMORY_NVS:
1228                         e820_type = E820_NVS;
1229                         break;
1230 
1231                 case EFI_PERSISTENT_MEMORY:
1232                         e820_type = E820_PMEM;
1233                         break;
1234 
1235                 default:
1236                         continue;
1237                 }
1238 
1239                 /* Merge adjacent mappings */
1240                 if (prev && prev->type == e820_type &&
1241                     (prev->addr + prev->size) == d->phys_addr) {
1242                         prev->size += d->num_pages << 12;
1243                         continue;
1244                 }
1245 
1246                 if (nr_entries == ARRAY_SIZE(params->e820_map)) {
1247                         u32 need = (nr_desc - i) * sizeof(struct e820entry) +
1248                                    sizeof(struct setup_data);
1249 
1250                         if (!e820ext || e820ext_size < need)
1251                                 return EFI_BUFFER_TOO_SMALL;
1252 
1253                         /* boot_params map full, switch to e820 extended */
1254                         e820_map = (struct e820entry *)e820ext->data;
1255                 }
1256 
1257                 e820_map->addr = d->phys_addr;
1258                 e820_map->size = d->num_pages << PAGE_SHIFT;
1259                 e820_map->type = e820_type;
1260                 prev = e820_map++;
1261                 nr_entries++;
1262         }
1263 
1264         if (nr_entries > ARRAY_SIZE(params->e820_map)) {
1265                 u32 nr_e820ext = nr_entries - ARRAY_SIZE(params->e820_map);
1266 
1267                 add_e820ext(params, e820ext, nr_e820ext);
1268                 nr_entries -= nr_e820ext;
1269         }
1270 
1271         params->e820_entries = (u8)nr_entries;
1272 
1273         return EFI_SUCCESS;
1274 }
1275 
1276 static efi_status_t alloc_e820ext(u32 nr_desc, struct setup_data **e820ext,
1277                                   u32 *e820ext_size)
1278 {
1279         efi_status_t status;
1280         unsigned long size;
1281 
1282         size = sizeof(struct setup_data) +
1283                 sizeof(struct e820entry) * nr_desc;
1284 
1285         if (*e820ext) {
1286                 efi_call_early(free_pool, *e820ext);
1287                 *e820ext = NULL;
1288                 *e820ext_size = 0;
1289         }
1290 
1291         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1292                                 size, (void **)e820ext);
1293         if (status == EFI_SUCCESS)
1294                 *e820ext_size = size;
1295 
1296         return status;
1297 }
1298 
1299 static efi_status_t exit_boot(struct boot_params *boot_params,
1300                               void *handle, bool is64)
1301 {
1302         struct efi_info *efi = &boot_params->efi_info;
1303         unsigned long map_sz, key, desc_size;
1304         efi_memory_desc_t *mem_map;
1305         struct setup_data *e820ext;
1306         const char *signature;
1307         __u32 e820ext_size;
1308         __u32 nr_desc, prev_nr_desc;
1309         efi_status_t status;
1310         __u32 desc_version;
1311         bool called_exit = false;
1312         u8 nr_entries;
1313         int i;
1314 
1315         nr_desc = 0;
1316         e820ext = NULL;
1317         e820ext_size = 0;
1318 
1319 get_map:
1320         status = efi_get_memory_map(sys_table, &mem_map, &map_sz, &desc_size,
1321                                     &desc_version, &key);
1322 
1323         if (status != EFI_SUCCESS)
1324                 return status;
1325 
1326         prev_nr_desc = nr_desc;
1327         nr_desc = map_sz / desc_size;
1328         if (nr_desc > prev_nr_desc &&
1329             nr_desc > ARRAY_SIZE(boot_params->e820_map)) {
1330                 u32 nr_e820ext = nr_desc - ARRAY_SIZE(boot_params->e820_map);
1331 
1332                 status = alloc_e820ext(nr_e820ext, &e820ext, &e820ext_size);
1333                 if (status != EFI_SUCCESS)
1334                         goto free_mem_map;
1335 
1336                 efi_call_early(free_pool, mem_map);
1337                 goto get_map; /* Allocated memory, get map again */
1338         }
1339 
1340         signature = is64 ? EFI64_LOADER_SIGNATURE : EFI32_LOADER_SIGNATURE;
1341         memcpy(&efi->efi_loader_signature, signature, sizeof(__u32));
1342 
1343         efi->efi_systab = (unsigned long)sys_table;
1344         efi->efi_memdesc_size = desc_size;
1345         efi->efi_memdesc_version = desc_version;
1346         efi->efi_memmap = (unsigned long)mem_map;
1347         efi->efi_memmap_size = map_sz;
1348 
1349 #ifdef CONFIG_X86_64
1350         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1351         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1352 #endif
1353 
1354         /* Might as well exit boot services now */
1355         status = efi_call_early(exit_boot_services, handle, key);
1356         if (status != EFI_SUCCESS) {
1357                 /*
1358                  * ExitBootServices() will fail if any of the event
1359                  * handlers change the memory map. In which case, we
1360                  * must be prepared to retry, but only once so that
1361                  * we're guaranteed to exit on repeated failures instead
1362                  * of spinning forever.
1363                  */
1364                 if (called_exit)
1365                         goto free_mem_map;
1366 
1367                 called_exit = true;
1368                 efi_call_early(free_pool, mem_map);
1369                 goto get_map;
1370         }
1371 
1372         /* Historic? */
1373         boot_params->alt_mem_k = 32 * 1024;
1374 
1375         status = setup_e820(boot_params, e820ext, e820ext_size);
1376         if (status != EFI_SUCCESS)
1377                 return status;
1378 
1379         return EFI_SUCCESS;
1380 
1381 free_mem_map:
1382         efi_call_early(free_pool, mem_map);
1383         return status;
1384 }
1385 
1386 /*
1387  * On success we return a pointer to a boot_params structure, and NULL
1388  * on failure.
1389  */
1390 struct boot_params *efi_main(struct efi_config *c,
1391                              struct boot_params *boot_params)
1392 {
1393         struct desc_ptr *gdt = NULL;
1394         efi_loaded_image_t *image;
1395         struct setup_header *hdr = &boot_params->hdr;
1396         efi_status_t status;
1397         struct desc_struct *desc;
1398         void *handle;
1399         efi_system_table_t *_table;
1400         bool is64;
1401 
1402         efi_early = c;
1403 
1404         _table = (efi_system_table_t *)(unsigned long)efi_early->table;
1405         handle = (void *)(unsigned long)efi_early->image_handle;
1406         is64 = efi_early->is64;
1407 
1408         sys_table = _table;
1409 
1410         /* Check if we were booted by the EFI firmware */
1411         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1412                 goto fail;
1413 
1414         if (is64)
1415                 setup_boot_services64(efi_early);
1416         else
1417                 setup_boot_services32(efi_early);
1418 
1419         setup_graphics(boot_params);
1420 
1421         setup_efi_pci(boot_params);
1422 
1423         status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
1424                                 sizeof(*gdt), (void **)&gdt);
1425         if (status != EFI_SUCCESS) {
1426                 efi_printk(sys_table, "Failed to alloc mem for gdt structure\n");
1427                 goto fail;
1428         }
1429 
1430         gdt->size = 0x800;
1431         status = efi_low_alloc(sys_table, gdt->size, 8,
1432                            (unsigned long *)&gdt->address);
1433         if (status != EFI_SUCCESS) {
1434                 efi_printk(sys_table, "Failed to alloc mem for gdt\n");
1435                 goto fail;
1436         }
1437 
1438         /*
1439          * If the kernel isn't already loaded at the preferred load
1440          * address, relocate it.
1441          */
1442         if (hdr->pref_address != hdr->code32_start) {
1443                 unsigned long bzimage_addr = hdr->code32_start;
1444                 status = efi_relocate_kernel(sys_table, &bzimage_addr,
1445                                              hdr->init_size, hdr->init_size,
1446                                              hdr->pref_address,
1447                                              hdr->kernel_alignment);
1448                 if (status != EFI_SUCCESS) {
1449                         efi_printk(sys_table, "efi_relocate_kernel() failed!\n");
1450                         goto fail;
1451                 }
1452 
1453                 hdr->pref_address = hdr->code32_start;
1454                 hdr->code32_start = bzimage_addr;
1455         }
1456 
1457         status = exit_boot(boot_params, handle, is64);
1458         if (status != EFI_SUCCESS) {
1459                 efi_printk(sys_table, "exit_boot() failed!\n");
1460                 goto fail;
1461         }
1462 
1463         memset((char *)gdt->address, 0x0, gdt->size);
1464         desc = (struct desc_struct *)gdt->address;
1465 
1466         /* The first GDT is a dummy and the second is unused. */
1467         desc += 2;
1468 
1469         desc->limit0 = 0xffff;
1470         desc->base0 = 0x0000;
1471         desc->base1 = 0x0000;
1472         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1473         desc->s = DESC_TYPE_CODE_DATA;
1474         desc->dpl = 0;
1475         desc->p = 1;
1476         desc->limit = 0xf;
1477         desc->avl = 0;
1478         desc->l = 0;
1479         desc->d = SEG_OP_SIZE_32BIT;
1480         desc->g = SEG_GRANULARITY_4KB;
1481         desc->base2 = 0x00;
1482 
1483         desc++;
1484         desc->limit0 = 0xffff;
1485         desc->base0 = 0x0000;
1486         desc->base1 = 0x0000;
1487         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1488         desc->s = DESC_TYPE_CODE_DATA;
1489         desc->dpl = 0;
1490         desc->p = 1;
1491         desc->limit = 0xf;
1492         desc->avl = 0;
1493         desc->l = 0;
1494         desc->d = SEG_OP_SIZE_32BIT;
1495         desc->g = SEG_GRANULARITY_4KB;
1496         desc->base2 = 0x00;
1497 
1498 #ifdef CONFIG_X86_64
1499         /* Task segment value */
1500         desc++;
1501         desc->limit0 = 0x0000;
1502         desc->base0 = 0x0000;
1503         desc->base1 = 0x0000;
1504         desc->type = SEG_TYPE_TSS;
1505         desc->s = 0;
1506         desc->dpl = 0;
1507         desc->p = 1;
1508         desc->limit = 0x0;
1509         desc->avl = 0;
1510         desc->l = 0;
1511         desc->d = 0;
1512         desc->g = SEG_GRANULARITY_4KB;
1513         desc->base2 = 0x00;
1514 #endif /* CONFIG_X86_64 */
1515 
1516         asm volatile("cli");
1517         asm volatile ("lgdt %0" : : "m" (*gdt));
1518 
1519         return boot_params;
1520 fail:
1521         efi_printk(sys_table, "efi_main() failed!\n");
1522         return NULL;
1523 }
1524 

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