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 
__efi_early(void)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
__file_size32(void * __fh,efi_char16_t * filename_16,void ** handle,u64 * file_sz)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
__file_size64(void * __fh,efi_char16_t * filename_16,void ** handle,u64 * file_sz)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
efi_file_size(efi_system_table_t * sys_table,void * __fh,efi_char16_t * filename_16,void ** handle,u64 * file_sz)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
efi_file_read(void * handle,unsigned long * size,void * addr)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 
efi_file_close(void * handle)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 
__open_volume32(void * __image,void ** __fh)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 
__open_volume64(void * __image,void ** __fh)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
efi_open_volume(efi_system_table_t * sys_table,void * __image,void ** __fh)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 
efi_char16_printk(efi_system_table_t * table,efi_char16_t * str)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 
find_bits(unsigned long mask,u8 * pos,u8 * size)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
__setup_efi_pci32(efi_pci_io_protocol_32 * pci,struct pci_setup_rom ** __rom)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
setup_efi_pci32(struct boot_params * params,void ** pci_handle,unsigned long size)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
__setup_efi_pci64(efi_pci_io_protocol_64 * pci,struct pci_setup_rom ** __rom)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
setup_efi_pci64(struct boot_params * params,void ** pci_handle,unsigned long size)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  */
setup_efi_pci(struct boot_params * params)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
setup_pixel_info(struct screen_info * si,u32 pixels_per_scan_line,struct efi_pixel_bitmask pixel_info,int pixel_format)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
__gop_query32(struct efi_graphics_output_protocol_32 * gop32,struct efi_graphics_output_mode_info ** info,unsigned long * size,u64 * fb_base)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
setup_gop32(struct screen_info * si,efi_guid_t * proto,unsigned long size,void ** gop_handle)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 		u64 current_fb_base;
672 
673 		status = efi_call_early(handle_protocol, h,
674 					proto, (void **)&gop32);
675 		if (status != EFI_SUCCESS)
676 			continue;
677 
678 		status = efi_call_early(handle_protocol, h,
679 					&conout_proto, &dummy);
680 		if (status == EFI_SUCCESS)
681 			conout_found = true;
682 
683 		status = __gop_query32(gop32, &info, &size, &current_fb_base);
684 		if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
685 			/*
686 			 * Systems that use the UEFI Console Splitter may
687 			 * provide multiple GOP devices, not all of which are
688 			 * backed by real hardware. The workaround is to search
689 			 * for a GOP implementing the ConOut protocol, and if
690 			 * one isn't found, to just fall back to the first GOP.
691 			 */
692 			width = info->horizontal_resolution;
693 			height = info->vertical_resolution;
694 			pixel_format = info->pixel_format;
695 			pixel_info = info->pixel_information;
696 			pixels_per_scan_line = info->pixels_per_scan_line;
697 			fb_base = current_fb_base;
698 
699 			/*
700 			 * Once we've found a GOP supporting ConOut,
701 			 * don't bother looking any further.
702 			 */
703 			first_gop = gop32;
704 			if (conout_found)
705 				break;
706 		}
707 	}
708 
709 	/* Did we find any GOPs? */
710 	if (!first_gop)
711 		goto out;
712 
713 	/* EFI framebuffer */
714 	si->orig_video_isVGA = VIDEO_TYPE_EFI;
715 
716 	si->lfb_width = width;
717 	si->lfb_height = height;
718 	si->lfb_base = fb_base;
719 
720 	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
721 	if (ext_lfb_base) {
722 		si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
723 		si->ext_lfb_base = ext_lfb_base;
724 	}
725 
726 	si->pages = 1;
727 
728 	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
729 
730 	si->lfb_size = si->lfb_linelength * si->lfb_height;
731 
732 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
733 out:
734 	return status;
735 }
736 
737 static efi_status_t
__gop_query64(struct efi_graphics_output_protocol_64 * gop64,struct efi_graphics_output_mode_info ** info,unsigned long * size,u64 * fb_base)738 __gop_query64(struct efi_graphics_output_protocol_64 *gop64,
739 	      struct efi_graphics_output_mode_info **info,
740 	      unsigned long *size, u64 *fb_base)
741 {
742 	struct efi_graphics_output_protocol_mode_64 *mode;
743 	efi_status_t status;
744 	unsigned long m;
745 
746 	m = gop64->mode;
747 	mode = (struct efi_graphics_output_protocol_mode_64 *)m;
748 
749 	status = efi_early->call(gop64->query_mode, gop64,
750 				 mode->mode, size, info);
751 	if (status != EFI_SUCCESS)
752 		return status;
753 
754 	*fb_base = mode->frame_buffer_base;
755 	return status;
756 }
757 
758 static efi_status_t
setup_gop64(struct screen_info * si,efi_guid_t * proto,unsigned long size,void ** gop_handle)759 setup_gop64(struct screen_info *si, efi_guid_t *proto,
760 	    unsigned long size, void **gop_handle)
761 {
762 	struct efi_graphics_output_protocol_64 *gop64, *first_gop;
763 	unsigned long nr_gops;
764 	u16 width, height;
765 	u32 pixels_per_scan_line;
766 	u32 ext_lfb_base;
767 	u64 fb_base;
768 	struct efi_pixel_bitmask pixel_info;
769 	int pixel_format;
770 	efi_status_t status;
771 	u64 *handles = (u64 *)(unsigned long)gop_handle;
772 	int i;
773 
774 	first_gop = NULL;
775 	gop64 = NULL;
776 
777 	nr_gops = size / sizeof(u64);
778 	for (i = 0; i < nr_gops; i++) {
779 		struct efi_graphics_output_mode_info *info = NULL;
780 		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
781 		bool conout_found = false;
782 		void *dummy = NULL;
783 		u64 h = handles[i];
784 		u64 current_fb_base;
785 
786 		status = efi_call_early(handle_protocol, h,
787 					proto, (void **)&gop64);
788 		if (status != EFI_SUCCESS)
789 			continue;
790 
791 		status = efi_call_early(handle_protocol, h,
792 					&conout_proto, &dummy);
793 		if (status == EFI_SUCCESS)
794 			conout_found = true;
795 
796 		status = __gop_query64(gop64, &info, &size, &current_fb_base);
797 		if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
798 			/*
799 			 * Systems that use the UEFI Console Splitter may
800 			 * provide multiple GOP devices, not all of which are
801 			 * backed by real hardware. The workaround is to search
802 			 * for a GOP implementing the ConOut protocol, and if
803 			 * one isn't found, to just fall back to the first GOP.
804 			 */
805 			width = info->horizontal_resolution;
806 			height = info->vertical_resolution;
807 			pixel_format = info->pixel_format;
808 			pixel_info = info->pixel_information;
809 			pixels_per_scan_line = info->pixels_per_scan_line;
810 			fb_base = current_fb_base;
811 
812 			/*
813 			 * Once we've found a GOP supporting ConOut,
814 			 * don't bother looking any further.
815 			 */
816 			first_gop = gop64;
817 			if (conout_found)
818 				break;
819 		}
820 	}
821 
822 	/* Did we find any GOPs? */
823 	if (!first_gop)
824 		goto out;
825 
826 	/* EFI framebuffer */
827 	si->orig_video_isVGA = VIDEO_TYPE_EFI;
828 
829 	si->lfb_width = width;
830 	si->lfb_height = height;
831 	si->lfb_base = fb_base;
832 
833 	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
834 	if (ext_lfb_base) {
835 		si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
836 		si->ext_lfb_base = ext_lfb_base;
837 	}
838 
839 	si->pages = 1;
840 
841 	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);
842 
843 	si->lfb_size = si->lfb_linelength * si->lfb_height;
844 
845 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
846 out:
847 	return status;
848 }
849 
850 /*
851  * See if we have Graphics Output Protocol
852  */
setup_gop(struct screen_info * si,efi_guid_t * proto,unsigned long size)853 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
854 			      unsigned long size)
855 {
856 	efi_status_t status;
857 	void **gop_handle = NULL;
858 
859 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
860 				size, (void **)&gop_handle);
861 	if (status != EFI_SUCCESS)
862 		return status;
863 
864 	status = efi_call_early(locate_handle,
865 				EFI_LOCATE_BY_PROTOCOL,
866 				proto, NULL, &size, gop_handle);
867 	if (status != EFI_SUCCESS)
868 		goto free_handle;
869 
870 	if (efi_early->is64)
871 		status = setup_gop64(si, proto, size, gop_handle);
872 	else
873 		status = setup_gop32(si, proto, size, gop_handle);
874 
875 free_handle:
876 	efi_call_early(free_pool, gop_handle);
877 	return status;
878 }
879 
880 static efi_status_t
setup_uga32(void ** uga_handle,unsigned long size,u32 * width,u32 * height)881 setup_uga32(void **uga_handle, unsigned long size, u32 *width, u32 *height)
882 {
883 	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
884 	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
885 	unsigned long nr_ugas;
886 	u32 *handles = (u32 *)uga_handle;;
887 	efi_status_t status;
888 	int i;
889 
890 	first_uga = NULL;
891 	nr_ugas = size / sizeof(u32);
892 	for (i = 0; i < nr_ugas; i++) {
893 		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
894 		u32 w, h, depth, refresh;
895 		void *pciio;
896 		u32 handle = handles[i];
897 
898 		status = efi_call_early(handle_protocol, handle,
899 					&uga_proto, (void **)&uga);
900 		if (status != EFI_SUCCESS)
901 			continue;
902 
903 		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
904 
905 		status = efi_early->call((unsigned long)uga->get_mode, uga,
906 					 &w, &h, &depth, &refresh);
907 		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
908 			*width = w;
909 			*height = h;
910 
911 			/*
912 			 * Once we've found a UGA supporting PCIIO,
913 			 * don't bother looking any further.
914 			 */
915 			if (pciio)
916 				break;
917 
918 			first_uga = uga;
919 		}
920 	}
921 
922 	return status;
923 }
924 
925 static efi_status_t
setup_uga64(void ** uga_handle,unsigned long size,u32 * width,u32 * height)926 setup_uga64(void **uga_handle, unsigned long size, u32 *width, u32 *height)
927 {
928 	struct efi_uga_draw_protocol *uga = NULL, *first_uga;
929 	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
930 	unsigned long nr_ugas;
931 	u64 *handles = (u64 *)uga_handle;;
932 	efi_status_t status;
933 	int i;
934 
935 	first_uga = NULL;
936 	nr_ugas = size / sizeof(u64);
937 	for (i = 0; i < nr_ugas; i++) {
938 		efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
939 		u32 w, h, depth, refresh;
940 		void *pciio;
941 		u64 handle = handles[i];
942 
943 		status = efi_call_early(handle_protocol, handle,
944 					&uga_proto, (void **)&uga);
945 		if (status != EFI_SUCCESS)
946 			continue;
947 
948 		efi_call_early(handle_protocol, handle, &pciio_proto, &pciio);
949 
950 		status = efi_early->call((unsigned long)uga->get_mode, uga,
951 					 &w, &h, &depth, &refresh);
952 		if (status == EFI_SUCCESS && (!first_uga || pciio)) {
953 			*width = w;
954 			*height = h;
955 
956 			/*
957 			 * Once we've found a UGA supporting PCIIO,
958 			 * don't bother looking any further.
959 			 */
960 			if (pciio)
961 				break;
962 
963 			first_uga = uga;
964 		}
965 	}
966 
967 	return status;
968 }
969 
970 /*
971  * See if we have Universal Graphics Adapter (UGA) protocol
972  */
setup_uga(struct screen_info * si,efi_guid_t * uga_proto,unsigned long size)973 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
974 			      unsigned long size)
975 {
976 	efi_status_t status;
977 	u32 width, height;
978 	void **uga_handle = NULL;
979 
980 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
981 				size, (void **)&uga_handle);
982 	if (status != EFI_SUCCESS)
983 		return status;
984 
985 	status = efi_call_early(locate_handle,
986 				EFI_LOCATE_BY_PROTOCOL,
987 				uga_proto, NULL, &size, uga_handle);
988 	if (status != EFI_SUCCESS)
989 		goto free_handle;
990 
991 	height = 0;
992 	width = 0;
993 
994 	if (efi_early->is64)
995 		status = setup_uga64(uga_handle, size, &width, &height);
996 	else
997 		status = setup_uga32(uga_handle, size, &width, &height);
998 
999 	if (!width && !height)
1000 		goto free_handle;
1001 
1002 	/* EFI framebuffer */
1003 	si->orig_video_isVGA = VIDEO_TYPE_EFI;
1004 
1005 	si->lfb_depth = 32;
1006 	si->lfb_width = width;
1007 	si->lfb_height = height;
1008 
1009 	si->red_size = 8;
1010 	si->red_pos = 16;
1011 	si->green_size = 8;
1012 	si->green_pos = 8;
1013 	si->blue_size = 8;
1014 	si->blue_pos = 0;
1015 	si->rsvd_size = 8;
1016 	si->rsvd_pos = 24;
1017 
1018 free_handle:
1019 	efi_call_early(free_pool, uga_handle);
1020 	return status;
1021 }
1022 
setup_graphics(struct boot_params * boot_params)1023 void setup_graphics(struct boot_params *boot_params)
1024 {
1025 	efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
1026 	struct screen_info *si;
1027 	efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
1028 	efi_status_t status;
1029 	unsigned long size;
1030 	void **gop_handle = NULL;
1031 	void **uga_handle = NULL;
1032 
1033 	si = &boot_params->screen_info;
1034 	memset(si, 0, sizeof(*si));
1035 
1036 	size = 0;
1037 	status = efi_call_early(locate_handle,
1038 				EFI_LOCATE_BY_PROTOCOL,
1039 				&graphics_proto, NULL, &size, gop_handle);
1040 	if (status == EFI_BUFFER_TOO_SMALL)
1041 		status = setup_gop(si, &graphics_proto, size);
1042 
1043 	if (status != EFI_SUCCESS) {
1044 		size = 0;
1045 		status = efi_call_early(locate_handle,
1046 					EFI_LOCATE_BY_PROTOCOL,
1047 					&uga_proto, NULL, &size, uga_handle);
1048 		if (status == EFI_BUFFER_TOO_SMALL)
1049 			setup_uga(si, &uga_proto, size);
1050 	}
1051 }
1052 
1053 /*
1054  * Because the x86 boot code expects to be passed a boot_params we
1055  * need to create one ourselves (usually the bootloader would create
1056  * one for us).
1057  *
1058  * The caller is responsible for filling out ->code32_start in the
1059  * returned boot_params.
1060  */
make_boot_params(struct efi_config * c)1061 struct boot_params *make_boot_params(struct efi_config *c)
1062 {
1063 	struct boot_params *boot_params;
1064 	struct apm_bios_info *bi;
1065 	struct setup_header *hdr;
1066 	struct efi_info *efi;
1067 	efi_loaded_image_t *image;
1068 	void *options, *handle;
1069 	efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
1070 	int options_size = 0;
1071 	efi_status_t status;
1072 	char *cmdline_ptr;
1073 	u16 *s2;
1074 	u8 *s1;
1075 	int i;
1076 	unsigned long ramdisk_addr;
1077 	unsigned long ramdisk_size;
1078 
1079 	efi_early = c;
1080 	sys_table = (efi_system_table_t *)(unsigned long)efi_early->table;
1081 	handle = (void *)(unsigned long)efi_early->image_handle;
1082 
1083 	/* Check if we were booted by the EFI firmware */
1084 	if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1085 		return NULL;
1086 
1087 	if (efi_early->is64)
1088 		setup_boot_services64(efi_early);
1089 	else
1090 		setup_boot_services32(efi_early);
1091 
1092 	status = efi_call_early(handle_protocol, handle,
1093 				&proto, (void *)&image);
1094 	if (status != EFI_SUCCESS) {
1095 		efi_printk(sys_table, "Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
1096 		return NULL;
1097 	}
1098 
1099 	status = efi_low_alloc(sys_table, 0x4000, 1,
1100 			       (unsigned long *)&boot_params);
1101 	if (status != EFI_SUCCESS) {
1102 		efi_printk(sys_table, "Failed to alloc lowmem for boot params\n");
1103 		return NULL;
1104 	}
1105 
1106 	memset(boot_params, 0x0, 0x4000);
1107 
1108 	hdr = &boot_params->hdr;
1109 	efi = &boot_params->efi_info;
1110 	bi = &boot_params->apm_bios_info;
1111 
1112 	/* Copy the second sector to boot_params */
1113 	memcpy(&hdr->jump, image->image_base + 512, 512);
1114 
1115 	/*
1116 	 * Fill out some of the header fields ourselves because the
1117 	 * EFI firmware loader doesn't load the first sector.
1118 	 */
1119 	hdr->root_flags = 1;
1120 	hdr->vid_mode = 0xffff;
1121 	hdr->boot_flag = 0xAA55;
1122 
1123 	hdr->type_of_loader = 0x21;
1124 
1125 	/* Convert unicode cmdline to ascii */
1126 	cmdline_ptr = efi_convert_cmdline(sys_table, image, &options_size);
1127 	if (!cmdline_ptr)
1128 		goto fail;
1129 	hdr->cmd_line_ptr = (unsigned long)cmdline_ptr;
1130 	/* Fill in upper bits of command line address, NOP on 32 bit  */
1131 	boot_params->ext_cmd_line_ptr = (u64)(unsigned long)cmdline_ptr >> 32;
1132 
1133 	hdr->ramdisk_image = 0;
1134 	hdr->ramdisk_size = 0;
1135 
1136 	/* Clear APM BIOS info */
1137 	memset(bi, 0, sizeof(*bi));
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 
add_e820ext(struct boot_params * params,struct setup_data * e820ext,u32 nr_entries)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 
setup_e820(struct boot_params * params,struct setup_data * e820ext,u32 e820ext_size)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 
alloc_e820ext(u32 nr_desc,struct setup_data ** e820ext,u32 * e820ext_size)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 
exit_boot(struct boot_params * boot_params,void * handle,bool is64)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  */
efi_main(struct efi_config * c,struct boot_params * boot_params)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 }
1540