Merge tag 'efi-for-3.8' into x86/efi
[~shefty/rdma-dev.git] / arch / x86 / boot / compressed / eboot.c
1 /* -----------------------------------------------------------------------
2  *
3  *   Copyright 2011 Intel Corporation; author Matt Fleming
4  *
5  *   This file is part of the Linux kernel, and is made available under
6  *   the terms of the GNU General Public License version 2.
7  *
8  * ----------------------------------------------------------------------- */
9
10 #include <linux/efi.h>
11 #include <linux/pci.h>
12 #include <asm/efi.h>
13 #include <asm/setup.h>
14 #include <asm/desc.h>
15
16 #undef memcpy                   /* Use memcpy from misc.c */
17
18 #include "eboot.h"
19
20 static efi_system_table_t *sys_table;
21
22 static void efi_printk(char *str)
23 {
24         char *s8;
25
26         for (s8 = str; *s8; s8++) {
27                 struct efi_simple_text_output_protocol *out;
28                 efi_char16_t ch[2] = { 0 };
29
30                 ch[0] = *s8;
31                 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
32
33                 if (*s8 == '\n') {
34                         efi_char16_t nl[2] = { '\r', 0 };
35                         efi_call_phys2(out->output_string, out, nl);
36                 }
37
38                 efi_call_phys2(out->output_string, out, ch);
39         }
40 }
41
42 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
43                               unsigned long *desc_size)
44 {
45         efi_memory_desc_t *m = NULL;
46         efi_status_t status;
47         unsigned long key;
48         u32 desc_version;
49
50         *map_size = sizeof(*m) * 32;
51 again:
52         /*
53          * Add an additional efi_memory_desc_t because we're doing an
54          * allocation which may be in a new descriptor region.
55          */
56         *map_size += sizeof(*m);
57         status = efi_call_phys3(sys_table->boottime->allocate_pool,
58                                 EFI_LOADER_DATA, *map_size, (void **)&m);
59         if (status != EFI_SUCCESS)
60                 goto fail;
61
62         status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
63                                 m, &key, desc_size, &desc_version);
64         if (status == EFI_BUFFER_TOO_SMALL) {
65                 efi_call_phys1(sys_table->boottime->free_pool, m);
66                 goto again;
67         }
68
69         if (status != EFI_SUCCESS)
70                 efi_call_phys1(sys_table->boottime->free_pool, m);
71
72 fail:
73         *map = m;
74         return status;
75 }
76
77 /*
78  * Allocate at the highest possible address that is not above 'max'.
79  */
80 static efi_status_t high_alloc(unsigned long size, unsigned long align,
81                               unsigned long *addr, unsigned long max)
82 {
83         unsigned long map_size, desc_size;
84         efi_memory_desc_t *map;
85         efi_status_t status;
86         unsigned long nr_pages;
87         u64 max_addr = 0;
88         int i;
89
90         status = __get_map(&map, &map_size, &desc_size);
91         if (status != EFI_SUCCESS)
92                 goto fail;
93
94         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
95 again:
96         for (i = 0; i < map_size / desc_size; i++) {
97                 efi_memory_desc_t *desc;
98                 unsigned long m = (unsigned long)map;
99                 u64 start, end;
100
101                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
102                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
103                         continue;
104
105                 if (desc->num_pages < nr_pages)
106                         continue;
107
108                 start = desc->phys_addr;
109                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
110
111                 if ((start + size) > end || (start + size) > max)
112                         continue;
113
114                 if (end - size > max)
115                         end = max;
116
117                 if (round_down(end - size, align) < start)
118                         continue;
119
120                 start = round_down(end - size, align);
121
122                 /*
123                  * Don't allocate at 0x0. It will confuse code that
124                  * checks pointers against NULL.
125                  */
126                 if (start == 0x0)
127                         continue;
128
129                 if (start > max_addr)
130                         max_addr = start;
131         }
132
133         if (!max_addr)
134                 status = EFI_NOT_FOUND;
135         else {
136                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
137                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
138                                         nr_pages, &max_addr);
139                 if (status != EFI_SUCCESS) {
140                         max = max_addr;
141                         max_addr = 0;
142                         goto again;
143                 }
144
145                 *addr = max_addr;
146         }
147
148 free_pool:
149         efi_call_phys1(sys_table->boottime->free_pool, map);
150
151 fail:
152         return status;
153 }
154
155 /*
156  * Allocate at the lowest possible address.
157  */
158 static efi_status_t low_alloc(unsigned long size, unsigned long align,
159                               unsigned long *addr)
160 {
161         unsigned long map_size, desc_size;
162         efi_memory_desc_t *map;
163         efi_status_t status;
164         unsigned long nr_pages;
165         int i;
166
167         status = __get_map(&map, &map_size, &desc_size);
168         if (status != EFI_SUCCESS)
169                 goto fail;
170
171         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
172         for (i = 0; i < map_size / desc_size; i++) {
173                 efi_memory_desc_t *desc;
174                 unsigned long m = (unsigned long)map;
175                 u64 start, end;
176
177                 desc = (efi_memory_desc_t *)(m + (i * desc_size));
178
179                 if (desc->type != EFI_CONVENTIONAL_MEMORY)
180                         continue;
181
182                 if (desc->num_pages < nr_pages)
183                         continue;
184
185                 start = desc->phys_addr;
186                 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
187
188                 /*
189                  * Don't allocate at 0x0. It will confuse code that
190                  * checks pointers against NULL. Skip the first 8
191                  * bytes so we start at a nice even number.
192                  */
193                 if (start == 0x0)
194                         start += 8;
195
196                 start = round_up(start, align);
197                 if ((start + size) > end)
198                         continue;
199
200                 status = efi_call_phys4(sys_table->boottime->allocate_pages,
201                                         EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
202                                         nr_pages, &start);
203                 if (status == EFI_SUCCESS) {
204                         *addr = start;
205                         break;
206                 }
207         }
208
209         if (i == map_size / desc_size)
210                 status = EFI_NOT_FOUND;
211
212 free_pool:
213         efi_call_phys1(sys_table->boottime->free_pool, map);
214 fail:
215         return status;
216 }
217
218 static void low_free(unsigned long size, unsigned long addr)
219 {
220         unsigned long nr_pages;
221
222         nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
223         efi_call_phys2(sys_table->boottime->free_pages, addr, size);
224 }
225
226 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
227 {
228         u8 first, len;
229
230         first = 0;
231         len = 0;
232
233         if (mask) {
234                 while (!(mask & 0x1)) {
235                         mask = mask >> 1;
236                         first++;
237                 }
238
239                 while (mask & 0x1) {
240                         mask = mask >> 1;
241                         len++;
242                 }
243         }
244
245         *pos = first;
246         *size = len;
247 }
248
249 static efi_status_t setup_efi_pci(struct boot_params *params)
250 {
251         efi_pci_io_protocol *pci;
252         efi_status_t status;
253         void **pci_handle;
254         efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
255         unsigned long nr_pci, size = 0;
256         int i;
257         struct setup_data *data;
258
259         data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
260
261         while (data && data->next)
262                 data = (struct setup_data *)(unsigned long)data->next;
263
264         status = efi_call_phys5(sys_table->boottime->locate_handle,
265                                 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
266                                 NULL, &size, pci_handle);
267
268         if (status == EFI_BUFFER_TOO_SMALL) {
269                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
270                                         EFI_LOADER_DATA, size, &pci_handle);
271
272                 if (status != EFI_SUCCESS)
273                         return status;
274
275                 status = efi_call_phys5(sys_table->boottime->locate_handle,
276                                         EFI_LOCATE_BY_PROTOCOL, &pci_proto,
277                                         NULL, &size, pci_handle);
278         }
279
280         if (status != EFI_SUCCESS)
281                 goto free_handle;
282
283         nr_pci = size / sizeof(void *);
284         for (i = 0; i < nr_pci; i++) {
285                 void *h = pci_handle[i];
286                 uint64_t attributes;
287                 struct pci_setup_rom *rom;
288
289                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
290                                         h, &pci_proto, &pci);
291
292                 if (status != EFI_SUCCESS)
293                         continue;
294
295                 if (!pci)
296                         continue;
297
298 #ifdef CONFIG_X86_64
299                 status = efi_call_phys4(pci->attributes, pci,
300                                         EfiPciIoAttributeOperationGet, 0,
301                                         &attributes);
302 #else
303                 status = efi_call_phys5(pci->attributes, pci,
304                                         EfiPciIoAttributeOperationGet, 0, 0,
305                                         &attributes);
306 #endif
307                 if (status != EFI_SUCCESS)
308                         continue;
309
310                 if (!pci->romimage || !pci->romsize)
311                         continue;
312
313                 size = pci->romsize + sizeof(*rom);
314
315                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
316                                 EFI_LOADER_DATA, size, &rom);
317
318                 if (status != EFI_SUCCESS)
319                         continue;
320
321                 rom->data.type = SETUP_PCI;
322                 rom->data.len = size - sizeof(struct setup_data);
323                 rom->data.next = 0;
324                 rom->pcilen = pci->romsize;
325
326                 status = efi_call_phys5(pci->pci.read, pci,
327                                         EfiPciIoWidthUint16, PCI_VENDOR_ID,
328                                         1, &(rom->vendor));
329
330                 if (status != EFI_SUCCESS)
331                         goto free_struct;
332
333                 status = efi_call_phys5(pci->pci.read, pci,
334                                         EfiPciIoWidthUint16, PCI_DEVICE_ID,
335                                         1, &(rom->devid));
336
337                 if (status != EFI_SUCCESS)
338                         goto free_struct;
339
340                 status = efi_call_phys5(pci->get_location, pci,
341                                         &(rom->segment), &(rom->bus),
342                                         &(rom->device), &(rom->function));
343
344                 if (status != EFI_SUCCESS)
345                         goto free_struct;
346
347                 memcpy(rom->romdata, pci->romimage, pci->romsize);
348
349                 if (data)
350                         data->next = (unsigned long)rom;
351                 else
352                         params->hdr.setup_data = (unsigned long)rom;
353
354                 data = (struct setup_data *)rom;
355
356                 continue;
357         free_struct:
358                 efi_call_phys1(sys_table->boottime->free_pool, rom);
359         }
360
361 free_handle:
362         efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
363         return status;
364 }
365
366 /*
367  * See if we have Graphics Output Protocol
368  */
369 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
370                               unsigned long size)
371 {
372         struct efi_graphics_output_protocol *gop, *first_gop;
373         struct efi_pixel_bitmask pixel_info;
374         unsigned long nr_gops;
375         efi_status_t status;
376         void **gop_handle;
377         u16 width, height;
378         u32 fb_base, fb_size;
379         u32 pixels_per_scan_line;
380         int pixel_format;
381         int i;
382
383         status = efi_call_phys3(sys_table->boottime->allocate_pool,
384                                 EFI_LOADER_DATA, size, &gop_handle);
385         if (status != EFI_SUCCESS)
386                 return status;
387
388         status = efi_call_phys5(sys_table->boottime->locate_handle,
389                                 EFI_LOCATE_BY_PROTOCOL, proto,
390                                 NULL, &size, gop_handle);
391         if (status != EFI_SUCCESS)
392                 goto free_handle;
393
394         first_gop = NULL;
395
396         nr_gops = size / sizeof(void *);
397         for (i = 0; i < nr_gops; i++) {
398                 struct efi_graphics_output_mode_info *info;
399                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
400                 bool conout_found = false;
401                 void *dummy;
402                 void *h = gop_handle[i];
403
404                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
405                                         h, proto, &gop);
406                 if (status != EFI_SUCCESS)
407                         continue;
408
409                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
410                                         h, &conout_proto, &dummy);
411
412                 if (status == EFI_SUCCESS)
413                         conout_found = true;
414
415                 status = efi_call_phys4(gop->query_mode, gop,
416                                         gop->mode->mode, &size, &info);
417                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
418                         /*
419                          * Systems that use the UEFI Console Splitter may
420                          * provide multiple GOP devices, not all of which are
421                          * backed by real hardware. The workaround is to search
422                          * for a GOP implementing the ConOut protocol, and if
423                          * one isn't found, to just fall back to the first GOP.
424                          */
425                         width = info->horizontal_resolution;
426                         height = info->vertical_resolution;
427                         fb_base = gop->mode->frame_buffer_base;
428                         fb_size = gop->mode->frame_buffer_size;
429                         pixel_format = info->pixel_format;
430                         pixel_info = info->pixel_information;
431                         pixels_per_scan_line = info->pixels_per_scan_line;
432
433                         /*
434                          * Once we've found a GOP supporting ConOut,
435                          * don't bother looking any further.
436                          */
437                         first_gop = gop;
438                         if (conout_found)
439                                 break;
440                 }
441         }
442
443         /* Did we find any GOPs? */
444         if (!first_gop)
445                 goto free_handle;
446
447         /* EFI framebuffer */
448         si->orig_video_isVGA = VIDEO_TYPE_EFI;
449
450         si->lfb_width = width;
451         si->lfb_height = height;
452         si->lfb_base = fb_base;
453         si->pages = 1;
454
455         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
456                 si->lfb_depth = 32;
457                 si->lfb_linelength = pixels_per_scan_line * 4;
458                 si->red_size = 8;
459                 si->red_pos = 0;
460                 si->green_size = 8;
461                 si->green_pos = 8;
462                 si->blue_size = 8;
463                 si->blue_pos = 16;
464                 si->rsvd_size = 8;
465                 si->rsvd_pos = 24;
466         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
467                 si->lfb_depth = 32;
468                 si->lfb_linelength = pixels_per_scan_line * 4;
469                 si->red_size = 8;
470                 si->red_pos = 16;
471                 si->green_size = 8;
472                 si->green_pos = 8;
473                 si->blue_size = 8;
474                 si->blue_pos = 0;
475                 si->rsvd_size = 8;
476                 si->rsvd_pos = 24;
477         } else if (pixel_format == PIXEL_BIT_MASK) {
478                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
479                 find_bits(pixel_info.green_mask, &si->green_pos,
480                           &si->green_size);
481                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
482                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
483                           &si->rsvd_size);
484                 si->lfb_depth = si->red_size + si->green_size +
485                         si->blue_size + si->rsvd_size;
486                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
487         } else {
488                 si->lfb_depth = 4;
489                 si->lfb_linelength = si->lfb_width / 2;
490                 si->red_size = 0;
491                 si->red_pos = 0;
492                 si->green_size = 0;
493                 si->green_pos = 0;
494                 si->blue_size = 0;
495                 si->blue_pos = 0;
496                 si->rsvd_size = 0;
497                 si->rsvd_pos = 0;
498         }
499
500         si->lfb_size = si->lfb_linelength * si->lfb_height;
501
502         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
503
504 free_handle:
505         efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
506         return status;
507 }
508
509 /*
510  * See if we have Universal Graphics Adapter (UGA) protocol
511  */
512 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
513                               unsigned long size)
514 {
515         struct efi_uga_draw_protocol *uga, *first_uga;
516         unsigned long nr_ugas;
517         efi_status_t status;
518         u32 width, height;
519         void **uga_handle = NULL;
520         int i;
521
522         status = efi_call_phys3(sys_table->boottime->allocate_pool,
523                                 EFI_LOADER_DATA, size, &uga_handle);
524         if (status != EFI_SUCCESS)
525                 return status;
526
527         status = efi_call_phys5(sys_table->boottime->locate_handle,
528                                 EFI_LOCATE_BY_PROTOCOL, uga_proto,
529                                 NULL, &size, uga_handle);
530         if (status != EFI_SUCCESS)
531                 goto free_handle;
532
533         first_uga = NULL;
534
535         nr_ugas = size / sizeof(void *);
536         for (i = 0; i < nr_ugas; i++) {
537                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
538                 void *handle = uga_handle[i];
539                 u32 w, h, depth, refresh;
540                 void *pciio;
541
542                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
543                                         handle, uga_proto, &uga);
544                 if (status != EFI_SUCCESS)
545                         continue;
546
547                 efi_call_phys3(sys_table->boottime->handle_protocol,
548                                handle, &pciio_proto, &pciio);
549
550                 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
551                                         &depth, &refresh);
552                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
553                         width = w;
554                         height = h;
555
556                         /*
557                          * Once we've found a UGA supporting PCIIO,
558                          * don't bother looking any further.
559                          */
560                         if (pciio)
561                                 break;
562
563                         first_uga = uga;
564                 }
565         }
566
567         if (!first_uga)
568                 goto free_handle;
569
570         /* EFI framebuffer */
571         si->orig_video_isVGA = VIDEO_TYPE_EFI;
572
573         si->lfb_depth = 32;
574         si->lfb_width = width;
575         si->lfb_height = height;
576
577         si->red_size = 8;
578         si->red_pos = 16;
579         si->green_size = 8;
580         si->green_pos = 8;
581         si->blue_size = 8;
582         si->blue_pos = 0;
583         si->rsvd_size = 8;
584         si->rsvd_pos = 24;
585
586
587 free_handle:
588         efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
589         return status;
590 }
591
592 void setup_graphics(struct boot_params *boot_params)
593 {
594         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
595         struct screen_info *si;
596         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
597         efi_status_t status;
598         unsigned long size;
599         void **gop_handle = NULL;
600         void **uga_handle = NULL;
601
602         si = &boot_params->screen_info;
603         memset(si, 0, sizeof(*si));
604
605         size = 0;
606         status = efi_call_phys5(sys_table->boottime->locate_handle,
607                                 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
608                                 NULL, &size, gop_handle);
609         if (status == EFI_BUFFER_TOO_SMALL)
610                 status = setup_gop(si, &graphics_proto, size);
611
612         if (status != EFI_SUCCESS) {
613                 size = 0;
614                 status = efi_call_phys5(sys_table->boottime->locate_handle,
615                                         EFI_LOCATE_BY_PROTOCOL, &uga_proto,
616                                         NULL, &size, uga_handle);
617                 if (status == EFI_BUFFER_TOO_SMALL)
618                         setup_uga(si, &uga_proto, size);
619         }
620 }
621
622 struct initrd {
623         efi_file_handle_t *handle;
624         u64 size;
625 };
626
627 /*
628  * Check the cmdline for a LILO-style initrd= arguments.
629  *
630  * We only support loading an initrd from the same filesystem as the
631  * kernel image.
632  */
633 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
634                                     struct setup_header *hdr)
635 {
636         struct initrd *initrds;
637         unsigned long initrd_addr;
638         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
639         u64 initrd_total;
640         efi_file_io_interface_t *io;
641         efi_file_handle_t *fh;
642         efi_status_t status;
643         int nr_initrds;
644         char *str;
645         int i, j, k;
646
647         initrd_addr = 0;
648         initrd_total = 0;
649
650         str = (char *)(unsigned long)hdr->cmd_line_ptr;
651
652         j = 0;                  /* See close_handles */
653
654         if (!str || !*str)
655                 return EFI_SUCCESS;
656
657         for (nr_initrds = 0; *str; nr_initrds++) {
658                 str = strstr(str, "initrd=");
659                 if (!str)
660                         break;
661
662                 str += 7;
663
664                 /* Skip any leading slashes */
665                 while (*str == '/' || *str == '\\')
666                         str++;
667
668                 while (*str && *str != ' ' && *str != '\n')
669                         str++;
670         }
671
672         if (!nr_initrds)
673                 return EFI_SUCCESS;
674
675         status = efi_call_phys3(sys_table->boottime->allocate_pool,
676                                 EFI_LOADER_DATA,
677                                 nr_initrds * sizeof(*initrds),
678                                 &initrds);
679         if (status != EFI_SUCCESS) {
680                 efi_printk("Failed to alloc mem for initrds\n");
681                 goto fail;
682         }
683
684         str = (char *)(unsigned long)hdr->cmd_line_ptr;
685         for (i = 0; i < nr_initrds; i++) {
686                 struct initrd *initrd;
687                 efi_file_handle_t *h;
688                 efi_file_info_t *info;
689                 efi_char16_t filename_16[256];
690                 unsigned long info_sz;
691                 efi_guid_t info_guid = EFI_FILE_INFO_ID;
692                 efi_char16_t *p;
693                 u64 file_sz;
694
695                 str = strstr(str, "initrd=");
696                 if (!str)
697                         break;
698
699                 str += 7;
700
701                 initrd = &initrds[i];
702                 p = filename_16;
703
704                 /* Skip any leading slashes */
705                 while (*str == '/' || *str == '\\')
706                         str++;
707
708                 while (*str && *str != ' ' && *str != '\n') {
709                         if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
710                                 break;
711
712                         *p++ = *str++;
713                 }
714
715                 *p = '\0';
716
717                 /* Only open the volume once. */
718                 if (!i) {
719                         efi_boot_services_t *boottime;
720
721                         boottime = sys_table->boottime;
722
723                         status = efi_call_phys3(boottime->handle_protocol,
724                                         image->device_handle, &fs_proto, &io);
725                         if (status != EFI_SUCCESS) {
726                                 efi_printk("Failed to handle fs_proto\n");
727                                 goto free_initrds;
728                         }
729
730                         status = efi_call_phys2(io->open_volume, io, &fh);
731                         if (status != EFI_SUCCESS) {
732                                 efi_printk("Failed to open volume\n");
733                                 goto free_initrds;
734                         }
735                 }
736
737                 status = efi_call_phys5(fh->open, fh, &h, filename_16,
738                                         EFI_FILE_MODE_READ, (u64)0);
739                 if (status != EFI_SUCCESS) {
740                         efi_printk("Failed to open initrd file\n");
741                         goto close_handles;
742                 }
743
744                 initrd->handle = h;
745
746                 info_sz = 0;
747                 status = efi_call_phys4(h->get_info, h, &info_guid,
748                                         &info_sz, NULL);
749                 if (status != EFI_BUFFER_TOO_SMALL) {
750                         efi_printk("Failed to get initrd info size\n");
751                         goto close_handles;
752                 }
753
754 grow:
755                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
756                                         EFI_LOADER_DATA, info_sz, &info);
757                 if (status != EFI_SUCCESS) {
758                         efi_printk("Failed to alloc mem for initrd info\n");
759                         goto close_handles;
760                 }
761
762                 status = efi_call_phys4(h->get_info, h, &info_guid,
763                                         &info_sz, info);
764                 if (status == EFI_BUFFER_TOO_SMALL) {
765                         efi_call_phys1(sys_table->boottime->free_pool, info);
766                         goto grow;
767                 }
768
769                 file_sz = info->file_size;
770                 efi_call_phys1(sys_table->boottime->free_pool, info);
771
772                 if (status != EFI_SUCCESS) {
773                         efi_printk("Failed to get initrd info\n");
774                         goto close_handles;
775                 }
776
777                 initrd->size = file_sz;
778                 initrd_total += file_sz;
779         }
780
781         if (initrd_total) {
782                 unsigned long addr;
783
784                 /*
785                  * Multiple initrd's need to be at consecutive
786                  * addresses in memory, so allocate enough memory for
787                  * all the initrd's.
788                  */
789                 status = high_alloc(initrd_total, 0x1000,
790                                    &initrd_addr, hdr->initrd_addr_max);
791                 if (status != EFI_SUCCESS) {
792                         efi_printk("Failed to alloc highmem for initrds\n");
793                         goto close_handles;
794                 }
795
796                 /* We've run out of free low memory. */
797                 if (initrd_addr > hdr->initrd_addr_max) {
798                         efi_printk("We've run out of free low memory\n");
799                         status = EFI_INVALID_PARAMETER;
800                         goto free_initrd_total;
801                 }
802
803                 addr = initrd_addr;
804                 for (j = 0; j < nr_initrds; j++) {
805                         u64 size;
806
807                         size = initrds[j].size;
808                         while (size) {
809                                 u64 chunksize;
810                                 if (size > EFI_READ_CHUNK_SIZE)
811                                         chunksize = EFI_READ_CHUNK_SIZE;
812                                 else
813                                         chunksize = size;
814                                 status = efi_call_phys3(fh->read,
815                                                         initrds[j].handle,
816                                                         &chunksize, addr);
817                                 if (status != EFI_SUCCESS) {
818                                         efi_printk("Failed to read initrd\n");
819                                         goto free_initrd_total;
820                                 }
821                                 addr += chunksize;
822                                 size -= chunksize;
823                         }
824
825                         efi_call_phys1(fh->close, initrds[j].handle);
826                 }
827
828         }
829
830         efi_call_phys1(sys_table->boottime->free_pool, initrds);
831
832         hdr->ramdisk_image = initrd_addr;
833         hdr->ramdisk_size = initrd_total;
834
835         return status;
836
837 free_initrd_total:
838         low_free(initrd_total, initrd_addr);
839
840 close_handles:
841         for (k = j; k < i; k++)
842                 efi_call_phys1(fh->close, initrds[k].handle);
843 free_initrds:
844         efi_call_phys1(sys_table->boottime->free_pool, initrds);
845 fail:
846         hdr->ramdisk_image = 0;
847         hdr->ramdisk_size = 0;
848
849         return status;
850 }
851
852 /*
853  * Because the x86 boot code expects to be passed a boot_params we
854  * need to create one ourselves (usually the bootloader would create
855  * one for us).
856  */
857 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
858 {
859         struct boot_params *boot_params;
860         struct sys_desc_table *sdt;
861         struct apm_bios_info *bi;
862         struct setup_header *hdr;
863         struct efi_info *efi;
864         efi_loaded_image_t *image;
865         void *options;
866         u32 load_options_size;
867         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
868         int options_size = 0;
869         efi_status_t status;
870         unsigned long cmdline;
871         u16 *s2;
872         u8 *s1;
873         int i;
874
875         sys_table = _table;
876
877         /* Check if we were booted by the EFI firmware */
878         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
879                 return NULL;
880
881         status = efi_call_phys3(sys_table->boottime->handle_protocol,
882                                 handle, &proto, (void *)&image);
883         if (status != EFI_SUCCESS) {
884                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
885                 return NULL;
886         }
887
888         status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
889         if (status != EFI_SUCCESS) {
890                 efi_printk("Failed to alloc lowmem for boot params\n");
891                 return NULL;
892         }
893
894         memset(boot_params, 0x0, 0x4000);
895
896         hdr = &boot_params->hdr;
897         efi = &boot_params->efi_info;
898         bi = &boot_params->apm_bios_info;
899         sdt = &boot_params->sys_desc_table;
900
901         /* Copy the second sector to boot_params */
902         memcpy(&hdr->jump, image->image_base + 512, 512);
903
904         /*
905          * Fill out some of the header fields ourselves because the
906          * EFI firmware loader doesn't load the first sector.
907          */
908         hdr->root_flags = 1;
909         hdr->vid_mode = 0xffff;
910         hdr->boot_flag = 0xAA55;
911
912         hdr->code32_start = (__u64)(unsigned long)image->image_base;
913
914         hdr->type_of_loader = 0x21;
915
916         /* Convert unicode cmdline to ascii */
917         options = image->load_options;
918         load_options_size = image->load_options_size / 2; /* ASCII */
919         cmdline = 0;
920         s2 = (u16 *)options;
921
922         if (s2) {
923                 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
924                         s2++;
925                         options_size++;
926                 }
927
928                 if (options_size) {
929                         if (options_size > hdr->cmdline_size)
930                                 options_size = hdr->cmdline_size;
931
932                         options_size++; /* NUL termination */
933
934                         status = low_alloc(options_size, 1, &cmdline);
935                         if (status != EFI_SUCCESS) {
936                                 efi_printk("Failed to alloc mem for cmdline\n");
937                                 goto fail;
938                         }
939
940                         s1 = (u8 *)(unsigned long)cmdline;
941                         s2 = (u16 *)options;
942
943                         for (i = 0; i < options_size - 1; i++)
944                                 *s1++ = *s2++;
945
946                         *s1 = '\0';
947                 }
948         }
949
950         hdr->cmd_line_ptr = cmdline;
951
952         hdr->ramdisk_image = 0;
953         hdr->ramdisk_size = 0;
954
955         /* Clear APM BIOS info */
956         memset(bi, 0, sizeof(*bi));
957
958         memset(sdt, 0, sizeof(*sdt));
959
960         status = handle_ramdisks(image, hdr);
961         if (status != EFI_SUCCESS)
962                 goto fail2;
963
964         return boot_params;
965 fail2:
966         if (options_size)
967                 low_free(options_size, hdr->cmd_line_ptr);
968 fail:
969         low_free(0x4000, (unsigned long)boot_params);
970         return NULL;
971 }
972
973 static efi_status_t exit_boot(struct boot_params *boot_params,
974                               void *handle)
975 {
976         struct efi_info *efi = &boot_params->efi_info;
977         struct e820entry *e820_map = &boot_params->e820_map[0];
978         struct e820entry *prev = NULL;
979         unsigned long size, key, desc_size, _size;
980         efi_memory_desc_t *mem_map;
981         efi_status_t status;
982         __u32 desc_version;
983         u8 nr_entries;
984         int i;
985
986         size = sizeof(*mem_map) * 32;
987
988 again:
989         size += sizeof(*mem_map);
990         _size = size;
991         status = low_alloc(size, 1, (unsigned long *)&mem_map);
992         if (status != EFI_SUCCESS)
993                 return status;
994
995         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
996                                 mem_map, &key, &desc_size, &desc_version);
997         if (status == EFI_BUFFER_TOO_SMALL) {
998                 low_free(_size, (unsigned long)mem_map);
999                 goto again;
1000         }
1001
1002         if (status != EFI_SUCCESS)
1003                 goto free_mem_map;
1004
1005         memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
1006         efi->efi_systab = (unsigned long)sys_table;
1007         efi->efi_memdesc_size = desc_size;
1008         efi->efi_memdesc_version = desc_version;
1009         efi->efi_memmap = (unsigned long)mem_map;
1010         efi->efi_memmap_size = size;
1011
1012 #ifdef CONFIG_X86_64
1013         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1014         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1015 #endif
1016
1017         /* Might as well exit boot services now */
1018         status = efi_call_phys2(sys_table->boottime->exit_boot_services,
1019                                 handle, key);
1020         if (status != EFI_SUCCESS)
1021                 goto free_mem_map;
1022
1023         /* Historic? */
1024         boot_params->alt_mem_k = 32 * 1024;
1025
1026         /*
1027          * Convert the EFI memory map to E820.
1028          */
1029         nr_entries = 0;
1030         for (i = 0; i < size / desc_size; i++) {
1031                 efi_memory_desc_t *d;
1032                 unsigned int e820_type = 0;
1033                 unsigned long m = (unsigned long)mem_map;
1034
1035                 d = (efi_memory_desc_t *)(m + (i * desc_size));
1036                 switch (d->type) {
1037                 case EFI_RESERVED_TYPE:
1038                 case EFI_RUNTIME_SERVICES_CODE:
1039                 case EFI_RUNTIME_SERVICES_DATA:
1040                 case EFI_MEMORY_MAPPED_IO:
1041                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1042                 case EFI_PAL_CODE:
1043                         e820_type = E820_RESERVED;
1044                         break;
1045
1046                 case EFI_UNUSABLE_MEMORY:
1047                         e820_type = E820_UNUSABLE;
1048                         break;
1049
1050                 case EFI_ACPI_RECLAIM_MEMORY:
1051                         e820_type = E820_ACPI;
1052                         break;
1053
1054                 case EFI_LOADER_CODE:
1055                 case EFI_LOADER_DATA:
1056                 case EFI_BOOT_SERVICES_CODE:
1057                 case EFI_BOOT_SERVICES_DATA:
1058                 case EFI_CONVENTIONAL_MEMORY:
1059                         e820_type = E820_RAM;
1060                         break;
1061
1062                 case EFI_ACPI_MEMORY_NVS:
1063                         e820_type = E820_NVS;
1064                         break;
1065
1066                 default:
1067                         continue;
1068                 }
1069
1070                 /* Merge adjacent mappings */
1071                 if (prev && prev->type == e820_type &&
1072                     (prev->addr + prev->size) == d->phys_addr)
1073                         prev->size += d->num_pages << 12;
1074                 else {
1075                         e820_map->addr = d->phys_addr;
1076                         e820_map->size = d->num_pages << 12;
1077                         e820_map->type = e820_type;
1078                         prev = e820_map++;
1079                         nr_entries++;
1080                 }
1081         }
1082
1083         boot_params->e820_entries = nr_entries;
1084
1085         return EFI_SUCCESS;
1086
1087 free_mem_map:
1088         low_free(_size, (unsigned long)mem_map);
1089         return status;
1090 }
1091
1092 static efi_status_t relocate_kernel(struct setup_header *hdr)
1093 {
1094         unsigned long start, nr_pages;
1095         efi_status_t status;
1096
1097         /*
1098          * The EFI firmware loader could have placed the kernel image
1099          * anywhere in memory, but the kernel has various restrictions
1100          * on the max physical address it can run at. Attempt to move
1101          * the kernel to boot_params.pref_address, or as low as
1102          * possible.
1103          */
1104         start = hdr->pref_address;
1105         nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
1106
1107         status = efi_call_phys4(sys_table->boottime->allocate_pages,
1108                                 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
1109                                 nr_pages, &start);
1110         if (status != EFI_SUCCESS) {
1111                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
1112                                    &start);
1113                 if (status != EFI_SUCCESS)
1114                         efi_printk("Failed to alloc mem for kernel\n");
1115         }
1116
1117         if (status == EFI_SUCCESS)
1118                 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1119                        hdr->init_size);
1120
1121         hdr->pref_address = hdr->code32_start;
1122         hdr->code32_start = (__u32)start;
1123
1124         return status;
1125 }
1126
1127 /*
1128  * On success we return a pointer to a boot_params structure, and NULL
1129  * on failure.
1130  */
1131 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1132                              struct boot_params *boot_params)
1133 {
1134         struct desc_ptr *gdt, *idt;
1135         efi_loaded_image_t *image;
1136         struct setup_header *hdr = &boot_params->hdr;
1137         efi_status_t status;
1138         struct desc_struct *desc;
1139
1140         sys_table = _table;
1141
1142         /* Check if we were booted by the EFI firmware */
1143         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1144                 goto fail;
1145
1146         setup_graphics(boot_params);
1147
1148         setup_efi_pci(boot_params);
1149
1150         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1151                                 EFI_LOADER_DATA, sizeof(*gdt),
1152                                 (void **)&gdt);
1153         if (status != EFI_SUCCESS) {
1154                 efi_printk("Failed to alloc mem for gdt structure\n");
1155                 goto fail;
1156         }
1157
1158         gdt->size = 0x800;
1159         status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1160         if (status != EFI_SUCCESS) {
1161                 efi_printk("Failed to alloc mem for gdt\n");
1162                 goto fail;
1163         }
1164
1165         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1166                                 EFI_LOADER_DATA, sizeof(*idt),
1167                                 (void **)&idt);
1168         if (status != EFI_SUCCESS) {
1169                 efi_printk("Failed to alloc mem for idt structure\n");
1170                 goto fail;
1171         }
1172
1173         idt->size = 0;
1174         idt->address = 0;
1175
1176         /*
1177          * If the kernel isn't already loaded at the preferred load
1178          * address, relocate it.
1179          */
1180         if (hdr->pref_address != hdr->code32_start) {
1181                 status = relocate_kernel(hdr);
1182
1183                 if (status != EFI_SUCCESS)
1184                         goto fail;
1185         }
1186
1187         status = exit_boot(boot_params, handle);
1188         if (status != EFI_SUCCESS)
1189                 goto fail;
1190
1191         memset((char *)gdt->address, 0x0, gdt->size);
1192         desc = (struct desc_struct *)gdt->address;
1193
1194         /* The first GDT is a dummy and the second is unused. */
1195         desc += 2;
1196
1197         desc->limit0 = 0xffff;
1198         desc->base0 = 0x0000;
1199         desc->base1 = 0x0000;
1200         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1201         desc->s = DESC_TYPE_CODE_DATA;
1202         desc->dpl = 0;
1203         desc->p = 1;
1204         desc->limit = 0xf;
1205         desc->avl = 0;
1206         desc->l = 0;
1207         desc->d = SEG_OP_SIZE_32BIT;
1208         desc->g = SEG_GRANULARITY_4KB;
1209         desc->base2 = 0x00;
1210
1211         desc++;
1212         desc->limit0 = 0xffff;
1213         desc->base0 = 0x0000;
1214         desc->base1 = 0x0000;
1215         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1216         desc->s = DESC_TYPE_CODE_DATA;
1217         desc->dpl = 0;
1218         desc->p = 1;
1219         desc->limit = 0xf;
1220         desc->avl = 0;
1221         desc->l = 0;
1222         desc->d = SEG_OP_SIZE_32BIT;
1223         desc->g = SEG_GRANULARITY_4KB;
1224         desc->base2 = 0x00;
1225
1226 #ifdef CONFIG_X86_64
1227         /* Task segment value */
1228         desc++;
1229         desc->limit0 = 0x0000;
1230         desc->base0 = 0x0000;
1231         desc->base1 = 0x0000;
1232         desc->type = SEG_TYPE_TSS;
1233         desc->s = 0;
1234         desc->dpl = 0;
1235         desc->p = 1;
1236         desc->limit = 0x0;
1237         desc->avl = 0;
1238         desc->l = 0;
1239         desc->d = 0;
1240         desc->g = SEG_GRANULARITY_4KB;
1241         desc->base2 = 0x00;
1242 #endif /* CONFIG_X86_64 */
1243
1244         asm volatile ("lidt %0" : : "m" (*idt));
1245         asm volatile ("lgdt %0" : : "m" (*gdt));
1246
1247         asm volatile("cli");
1248
1249         return boot_params;
1250 fail:
1251         return NULL;
1252 }