x86, build: Dynamically find entry points in compressed startup code
[~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 *)params->hdr.setup_data;
260
261         while (data && data->next)
262                 data = (struct setup_data *)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 (!(attributes & EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM))
311                         continue;
312
313                 if (!pci->romimage || !pci->romsize)
314                         continue;
315
316                 size = pci->romsize + sizeof(*rom);
317
318                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
319                                 EFI_LOADER_DATA, size, &rom);
320
321                 if (status != EFI_SUCCESS)
322                         continue;
323
324                 rom->data.type = SETUP_PCI;
325                 rom->data.len = size - sizeof(struct setup_data);
326                 rom->data.next = 0;
327                 rom->pcilen = pci->romsize;
328
329                 status = efi_call_phys5(pci->pci.read, pci,
330                                         EfiPciIoWidthUint16, PCI_VENDOR_ID,
331                                         1, &(rom->vendor));
332
333                 if (status != EFI_SUCCESS)
334                         goto free_struct;
335
336                 status = efi_call_phys5(pci->pci.read, pci,
337                                         EfiPciIoWidthUint16, PCI_DEVICE_ID,
338                                         1, &(rom->devid));
339
340                 if (status != EFI_SUCCESS)
341                         goto free_struct;
342
343                 status = efi_call_phys5(pci->get_location, pci,
344                                         &(rom->segment), &(rom->bus),
345                                         &(rom->device), &(rom->function));
346
347                 if (status != EFI_SUCCESS)
348                         goto free_struct;
349
350                 memcpy(rom->romdata, pci->romimage, pci->romsize);
351
352                 if (data)
353                         data->next = (uint64_t)rom;
354                 else
355                         params->hdr.setup_data = (uint64_t)rom;
356
357                 data = (struct setup_data *)rom;
358
359                 continue;
360         free_struct:
361                 efi_call_phys1(sys_table->boottime->free_pool, rom);
362         }
363
364 free_handle:
365         efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
366         return status;
367 }
368
369 /*
370  * See if we have Graphics Output Protocol
371  */
372 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
373                               unsigned long size)
374 {
375         struct efi_graphics_output_protocol *gop, *first_gop;
376         struct efi_pixel_bitmask pixel_info;
377         unsigned long nr_gops;
378         efi_status_t status;
379         void **gop_handle;
380         u16 width, height;
381         u32 fb_base, fb_size;
382         u32 pixels_per_scan_line;
383         int pixel_format;
384         int i;
385
386         status = efi_call_phys3(sys_table->boottime->allocate_pool,
387                                 EFI_LOADER_DATA, size, &gop_handle);
388         if (status != EFI_SUCCESS)
389                 return status;
390
391         status = efi_call_phys5(sys_table->boottime->locate_handle,
392                                 EFI_LOCATE_BY_PROTOCOL, proto,
393                                 NULL, &size, gop_handle);
394         if (status != EFI_SUCCESS)
395                 goto free_handle;
396
397         first_gop = NULL;
398
399         nr_gops = size / sizeof(void *);
400         for (i = 0; i < nr_gops; i++) {
401                 struct efi_graphics_output_mode_info *info;
402                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
403                 bool conout_found = false;
404                 void *dummy;
405                 void *h = gop_handle[i];
406
407                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
408                                         h, proto, &gop);
409                 if (status != EFI_SUCCESS)
410                         continue;
411
412                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
413                                         h, &conout_proto, &dummy);
414
415                 if (status == EFI_SUCCESS)
416                         conout_found = true;
417
418                 status = efi_call_phys4(gop->query_mode, gop,
419                                         gop->mode->mode, &size, &info);
420                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
421                         /*
422                          * Systems that use the UEFI Console Splitter may
423                          * provide multiple GOP devices, not all of which are
424                          * backed by real hardware. The workaround is to search
425                          * for a GOP implementing the ConOut protocol, and if
426                          * one isn't found, to just fall back to the first GOP.
427                          */
428                         width = info->horizontal_resolution;
429                         height = info->vertical_resolution;
430                         fb_base = gop->mode->frame_buffer_base;
431                         fb_size = gop->mode->frame_buffer_size;
432                         pixel_format = info->pixel_format;
433                         pixel_info = info->pixel_information;
434                         pixels_per_scan_line = info->pixels_per_scan_line;
435
436                         /*
437                          * Once we've found a GOP supporting ConOut,
438                          * don't bother looking any further.
439                          */
440                         first_gop = gop;
441                         if (conout_found)
442                                 break;
443                 }
444         }
445
446         /* Did we find any GOPs? */
447         if (!first_gop)
448                 goto free_handle;
449
450         /* EFI framebuffer */
451         si->orig_video_isVGA = VIDEO_TYPE_EFI;
452
453         si->lfb_width = width;
454         si->lfb_height = height;
455         si->lfb_base = fb_base;
456         si->pages = 1;
457
458         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
459                 si->lfb_depth = 32;
460                 si->lfb_linelength = pixels_per_scan_line * 4;
461                 si->red_size = 8;
462                 si->red_pos = 0;
463                 si->green_size = 8;
464                 si->green_pos = 8;
465                 si->blue_size = 8;
466                 si->blue_pos = 16;
467                 si->rsvd_size = 8;
468                 si->rsvd_pos = 24;
469         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
470                 si->lfb_depth = 32;
471                 si->lfb_linelength = pixels_per_scan_line * 4;
472                 si->red_size = 8;
473                 si->red_pos = 16;
474                 si->green_size = 8;
475                 si->green_pos = 8;
476                 si->blue_size = 8;
477                 si->blue_pos = 0;
478                 si->rsvd_size = 8;
479                 si->rsvd_pos = 24;
480         } else if (pixel_format == PIXEL_BIT_MASK) {
481                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
482                 find_bits(pixel_info.green_mask, &si->green_pos,
483                           &si->green_size);
484                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
485                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
486                           &si->rsvd_size);
487                 si->lfb_depth = si->red_size + si->green_size +
488                         si->blue_size + si->rsvd_size;
489                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
490         } else {
491                 si->lfb_depth = 4;
492                 si->lfb_linelength = si->lfb_width / 2;
493                 si->red_size = 0;
494                 si->red_pos = 0;
495                 si->green_size = 0;
496                 si->green_pos = 0;
497                 si->blue_size = 0;
498                 si->blue_pos = 0;
499                 si->rsvd_size = 0;
500                 si->rsvd_pos = 0;
501         }
502
503         si->lfb_size = si->lfb_linelength * si->lfb_height;
504
505         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
506
507 free_handle:
508         efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
509         return status;
510 }
511
512 /*
513  * See if we have Universal Graphics Adapter (UGA) protocol
514  */
515 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
516                               unsigned long size)
517 {
518         struct efi_uga_draw_protocol *uga, *first_uga;
519         unsigned long nr_ugas;
520         efi_status_t status;
521         u32 width, height;
522         void **uga_handle = NULL;
523         int i;
524
525         status = efi_call_phys3(sys_table->boottime->allocate_pool,
526                                 EFI_LOADER_DATA, size, &uga_handle);
527         if (status != EFI_SUCCESS)
528                 return status;
529
530         status = efi_call_phys5(sys_table->boottime->locate_handle,
531                                 EFI_LOCATE_BY_PROTOCOL, uga_proto,
532                                 NULL, &size, uga_handle);
533         if (status != EFI_SUCCESS)
534                 goto free_handle;
535
536         first_uga = NULL;
537
538         nr_ugas = size / sizeof(void *);
539         for (i = 0; i < nr_ugas; i++) {
540                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
541                 void *handle = uga_handle[i];
542                 u32 w, h, depth, refresh;
543                 void *pciio;
544
545                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
546                                         handle, uga_proto, &uga);
547                 if (status != EFI_SUCCESS)
548                         continue;
549
550                 efi_call_phys3(sys_table->boottime->handle_protocol,
551                                handle, &pciio_proto, &pciio);
552
553                 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
554                                         &depth, &refresh);
555                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
556                         width = w;
557                         height = h;
558
559                         /*
560                          * Once we've found a UGA supporting PCIIO,
561                          * don't bother looking any further.
562                          */
563                         if (pciio)
564                                 break;
565
566                         first_uga = uga;
567                 }
568         }
569
570         if (!first_uga)
571                 goto free_handle;
572
573         /* EFI framebuffer */
574         si->orig_video_isVGA = VIDEO_TYPE_EFI;
575
576         si->lfb_depth = 32;
577         si->lfb_width = width;
578         si->lfb_height = height;
579
580         si->red_size = 8;
581         si->red_pos = 16;
582         si->green_size = 8;
583         si->green_pos = 8;
584         si->blue_size = 8;
585         si->blue_pos = 0;
586         si->rsvd_size = 8;
587         si->rsvd_pos = 24;
588
589
590 free_handle:
591         efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
592         return status;
593 }
594
595 void setup_graphics(struct boot_params *boot_params)
596 {
597         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
598         struct screen_info *si;
599         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
600         efi_status_t status;
601         unsigned long size;
602         void **gop_handle = NULL;
603         void **uga_handle = NULL;
604
605         si = &boot_params->screen_info;
606         memset(si, 0, sizeof(*si));
607
608         size = 0;
609         status = efi_call_phys5(sys_table->boottime->locate_handle,
610                                 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
611                                 NULL, &size, gop_handle);
612         if (status == EFI_BUFFER_TOO_SMALL)
613                 status = setup_gop(si, &graphics_proto, size);
614
615         if (status != EFI_SUCCESS) {
616                 size = 0;
617                 status = efi_call_phys5(sys_table->boottime->locate_handle,
618                                         EFI_LOCATE_BY_PROTOCOL, &uga_proto,
619                                         NULL, &size, uga_handle);
620                 if (status == EFI_BUFFER_TOO_SMALL)
621                         setup_uga(si, &uga_proto, size);
622         }
623 }
624
625 struct initrd {
626         efi_file_handle_t *handle;
627         u64 size;
628 };
629
630 /*
631  * Check the cmdline for a LILO-style initrd= arguments.
632  *
633  * We only support loading an initrd from the same filesystem as the
634  * kernel image.
635  */
636 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
637                                     struct setup_header *hdr)
638 {
639         struct initrd *initrds;
640         unsigned long initrd_addr;
641         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
642         u64 initrd_total;
643         efi_file_io_interface_t *io;
644         efi_file_handle_t *fh;
645         efi_status_t status;
646         int nr_initrds;
647         char *str;
648         int i, j, k;
649
650         initrd_addr = 0;
651         initrd_total = 0;
652
653         str = (char *)(unsigned long)hdr->cmd_line_ptr;
654
655         j = 0;                  /* See close_handles */
656
657         if (!str || !*str)
658                 return EFI_SUCCESS;
659
660         for (nr_initrds = 0; *str; nr_initrds++) {
661                 str = strstr(str, "initrd=");
662                 if (!str)
663                         break;
664
665                 str += 7;
666
667                 /* Skip any leading slashes */
668                 while (*str == '/' || *str == '\\')
669                         str++;
670
671                 while (*str && *str != ' ' && *str != '\n')
672                         str++;
673         }
674
675         if (!nr_initrds)
676                 return EFI_SUCCESS;
677
678         status = efi_call_phys3(sys_table->boottime->allocate_pool,
679                                 EFI_LOADER_DATA,
680                                 nr_initrds * sizeof(*initrds),
681                                 &initrds);
682         if (status != EFI_SUCCESS) {
683                 efi_printk("Failed to alloc mem for initrds\n");
684                 goto fail;
685         }
686
687         str = (char *)(unsigned long)hdr->cmd_line_ptr;
688         for (i = 0; i < nr_initrds; i++) {
689                 struct initrd *initrd;
690                 efi_file_handle_t *h;
691                 efi_file_info_t *info;
692                 efi_char16_t filename_16[256];
693                 unsigned long info_sz;
694                 efi_guid_t info_guid = EFI_FILE_INFO_ID;
695                 efi_char16_t *p;
696                 u64 file_sz;
697
698                 str = strstr(str, "initrd=");
699                 if (!str)
700                         break;
701
702                 str += 7;
703
704                 initrd = &initrds[i];
705                 p = filename_16;
706
707                 /* Skip any leading slashes */
708                 while (*str == '/' || *str == '\\')
709                         str++;
710
711                 while (*str && *str != ' ' && *str != '\n') {
712                         if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
713                                 break;
714
715                         *p++ = *str++;
716                 }
717
718                 *p = '\0';
719
720                 /* Only open the volume once. */
721                 if (!i) {
722                         efi_boot_services_t *boottime;
723
724                         boottime = sys_table->boottime;
725
726                         status = efi_call_phys3(boottime->handle_protocol,
727                                         image->device_handle, &fs_proto, &io);
728                         if (status != EFI_SUCCESS) {
729                                 efi_printk("Failed to handle fs_proto\n");
730                                 goto free_initrds;
731                         }
732
733                         status = efi_call_phys2(io->open_volume, io, &fh);
734                         if (status != EFI_SUCCESS) {
735                                 efi_printk("Failed to open volume\n");
736                                 goto free_initrds;
737                         }
738                 }
739
740                 status = efi_call_phys5(fh->open, fh, &h, filename_16,
741                                         EFI_FILE_MODE_READ, (u64)0);
742                 if (status != EFI_SUCCESS) {
743                         efi_printk("Failed to open initrd file\n");
744                         goto close_handles;
745                 }
746
747                 initrd->handle = h;
748
749                 info_sz = 0;
750                 status = efi_call_phys4(h->get_info, h, &info_guid,
751                                         &info_sz, NULL);
752                 if (status != EFI_BUFFER_TOO_SMALL) {
753                         efi_printk("Failed to get initrd info size\n");
754                         goto close_handles;
755                 }
756
757 grow:
758                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
759                                         EFI_LOADER_DATA, info_sz, &info);
760                 if (status != EFI_SUCCESS) {
761                         efi_printk("Failed to alloc mem for initrd info\n");
762                         goto close_handles;
763                 }
764
765                 status = efi_call_phys4(h->get_info, h, &info_guid,
766                                         &info_sz, info);
767                 if (status == EFI_BUFFER_TOO_SMALL) {
768                         efi_call_phys1(sys_table->boottime->free_pool, info);
769                         goto grow;
770                 }
771
772                 file_sz = info->file_size;
773                 efi_call_phys1(sys_table->boottime->free_pool, info);
774
775                 if (status != EFI_SUCCESS) {
776                         efi_printk("Failed to get initrd info\n");
777                         goto close_handles;
778                 }
779
780                 initrd->size = file_sz;
781                 initrd_total += file_sz;
782         }
783
784         if (initrd_total) {
785                 unsigned long addr;
786
787                 /*
788                  * Multiple initrd's need to be at consecutive
789                  * addresses in memory, so allocate enough memory for
790                  * all the initrd's.
791                  */
792                 status = high_alloc(initrd_total, 0x1000,
793                                    &initrd_addr, hdr->initrd_addr_max);
794                 if (status != EFI_SUCCESS) {
795                         efi_printk("Failed to alloc highmem for initrds\n");
796                         goto close_handles;
797                 }
798
799                 /* We've run out of free low memory. */
800                 if (initrd_addr > hdr->initrd_addr_max) {
801                         efi_printk("We've run out of free low memory\n");
802                         status = EFI_INVALID_PARAMETER;
803                         goto free_initrd_total;
804                 }
805
806                 addr = initrd_addr;
807                 for (j = 0; j < nr_initrds; j++) {
808                         u64 size;
809
810                         size = initrds[j].size;
811                         while (size) {
812                                 u64 chunksize;
813                                 if (size > EFI_READ_CHUNK_SIZE)
814                                         chunksize = EFI_READ_CHUNK_SIZE;
815                                 else
816                                         chunksize = size;
817                                 status = efi_call_phys3(fh->read,
818                                                         initrds[j].handle,
819                                                         &chunksize, addr);
820                                 if (status != EFI_SUCCESS) {
821                                         efi_printk("Failed to read initrd\n");
822                                         goto free_initrd_total;
823                                 }
824                                 addr += chunksize;
825                                 size -= chunksize;
826                         }
827
828                         efi_call_phys1(fh->close, initrds[j].handle);
829                 }
830
831         }
832
833         efi_call_phys1(sys_table->boottime->free_pool, initrds);
834
835         hdr->ramdisk_image = initrd_addr;
836         hdr->ramdisk_size = initrd_total;
837
838         return status;
839
840 free_initrd_total:
841         low_free(initrd_total, initrd_addr);
842
843 close_handles:
844         for (k = j; k < i; k++)
845                 efi_call_phys1(fh->close, initrds[k].handle);
846 free_initrds:
847         efi_call_phys1(sys_table->boottime->free_pool, initrds);
848 fail:
849         hdr->ramdisk_image = 0;
850         hdr->ramdisk_size = 0;
851
852         return status;
853 }
854
855 /*
856  * Because the x86 boot code expects to be passed a boot_params we
857  * need to create one ourselves (usually the bootloader would create
858  * one for us).
859  */
860 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
861 {
862         struct boot_params *boot_params;
863         struct sys_desc_table *sdt;
864         struct apm_bios_info *bi;
865         struct setup_header *hdr;
866         struct efi_info *efi;
867         efi_loaded_image_t *image;
868         void *options;
869         u32 load_options_size;
870         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
871         int options_size = 0;
872         efi_status_t status;
873         unsigned long cmdline;
874         u16 *s2;
875         u8 *s1;
876         int i;
877
878         sys_table = _table;
879
880         /* Check if we were booted by the EFI firmware */
881         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
882                 return NULL;
883
884         status = efi_call_phys3(sys_table->boottime->handle_protocol,
885                                 handle, &proto, (void *)&image);
886         if (status != EFI_SUCCESS) {
887                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
888                 return NULL;
889         }
890
891         status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
892         if (status != EFI_SUCCESS) {
893                 efi_printk("Failed to alloc lowmem for boot params\n");
894                 return NULL;
895         }
896
897         memset(boot_params, 0x0, 0x4000);
898
899         hdr = &boot_params->hdr;
900         efi = &boot_params->efi_info;
901         bi = &boot_params->apm_bios_info;
902         sdt = &boot_params->sys_desc_table;
903
904         /* Copy the second sector to boot_params */
905         memcpy(&hdr->jump, image->image_base + 512, 512);
906
907         /*
908          * Fill out some of the header fields ourselves because the
909          * EFI firmware loader doesn't load the first sector.
910          */
911         hdr->root_flags = 1;
912         hdr->vid_mode = 0xffff;
913         hdr->boot_flag = 0xAA55;
914
915         hdr->code32_start = (__u64)(unsigned long)image->image_base;
916
917         hdr->type_of_loader = 0x21;
918
919         /* Convert unicode cmdline to ascii */
920         options = image->load_options;
921         load_options_size = image->load_options_size / 2; /* ASCII */
922         cmdline = 0;
923         s2 = (u16 *)options;
924
925         if (s2) {
926                 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
927                         s2++;
928                         options_size++;
929                 }
930
931                 if (options_size) {
932                         if (options_size > hdr->cmdline_size)
933                                 options_size = hdr->cmdline_size;
934
935                         options_size++; /* NUL termination */
936
937                         status = low_alloc(options_size, 1, &cmdline);
938                         if (status != EFI_SUCCESS) {
939                                 efi_printk("Failed to alloc mem for cmdline\n");
940                                 goto fail;
941                         }
942
943                         s1 = (u8 *)(unsigned long)cmdline;
944                         s2 = (u16 *)options;
945
946                         for (i = 0; i < options_size - 1; i++)
947                                 *s1++ = *s2++;
948
949                         *s1 = '\0';
950                 }
951         }
952
953         hdr->cmd_line_ptr = cmdline;
954
955         hdr->ramdisk_image = 0;
956         hdr->ramdisk_size = 0;
957
958         /* Clear APM BIOS info */
959         memset(bi, 0, sizeof(*bi));
960
961         memset(sdt, 0, sizeof(*sdt));
962
963         status = handle_ramdisks(image, hdr);
964         if (status != EFI_SUCCESS)
965                 goto fail2;
966
967         return boot_params;
968 fail2:
969         if (options_size)
970                 low_free(options_size, hdr->cmd_line_ptr);
971 fail:
972         low_free(0x4000, (unsigned long)boot_params);
973         return NULL;
974 }
975
976 static efi_status_t exit_boot(struct boot_params *boot_params,
977                               void *handle)
978 {
979         struct efi_info *efi = &boot_params->efi_info;
980         struct e820entry *e820_map = &boot_params->e820_map[0];
981         struct e820entry *prev = NULL;
982         unsigned long size, key, desc_size, _size;
983         efi_memory_desc_t *mem_map;
984         efi_status_t status;
985         __u32 desc_version;
986         u8 nr_entries;
987         int i;
988
989         size = sizeof(*mem_map) * 32;
990
991 again:
992         size += sizeof(*mem_map);
993         _size = size;
994         status = low_alloc(size, 1, (unsigned long *)&mem_map);
995         if (status != EFI_SUCCESS)
996                 return status;
997
998         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
999                                 mem_map, &key, &desc_size, &desc_version);
1000         if (status == EFI_BUFFER_TOO_SMALL) {
1001                 low_free(_size, (unsigned long)mem_map);
1002                 goto again;
1003         }
1004
1005         if (status != EFI_SUCCESS)
1006                 goto free_mem_map;
1007
1008         memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
1009         efi->efi_systab = (unsigned long)sys_table;
1010         efi->efi_memdesc_size = desc_size;
1011         efi->efi_memdesc_version = desc_version;
1012         efi->efi_memmap = (unsigned long)mem_map;
1013         efi->efi_memmap_size = size;
1014
1015 #ifdef CONFIG_X86_64
1016         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1017         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1018 #endif
1019
1020         /* Might as well exit boot services now */
1021         status = efi_call_phys2(sys_table->boottime->exit_boot_services,
1022                                 handle, key);
1023         if (status != EFI_SUCCESS)
1024                 goto free_mem_map;
1025
1026         /* Historic? */
1027         boot_params->alt_mem_k = 32 * 1024;
1028
1029         /*
1030          * Convert the EFI memory map to E820.
1031          */
1032         nr_entries = 0;
1033         for (i = 0; i < size / desc_size; i++) {
1034                 efi_memory_desc_t *d;
1035                 unsigned int e820_type = 0;
1036                 unsigned long m = (unsigned long)mem_map;
1037
1038                 d = (efi_memory_desc_t *)(m + (i * desc_size));
1039                 switch (d->type) {
1040                 case EFI_RESERVED_TYPE:
1041                 case EFI_RUNTIME_SERVICES_CODE:
1042                 case EFI_RUNTIME_SERVICES_DATA:
1043                 case EFI_MEMORY_MAPPED_IO:
1044                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1045                 case EFI_PAL_CODE:
1046                         e820_type = E820_RESERVED;
1047                         break;
1048
1049                 case EFI_UNUSABLE_MEMORY:
1050                         e820_type = E820_UNUSABLE;
1051                         break;
1052
1053                 case EFI_ACPI_RECLAIM_MEMORY:
1054                         e820_type = E820_ACPI;
1055                         break;
1056
1057                 case EFI_LOADER_CODE:
1058                 case EFI_LOADER_DATA:
1059                 case EFI_BOOT_SERVICES_CODE:
1060                 case EFI_BOOT_SERVICES_DATA:
1061                 case EFI_CONVENTIONAL_MEMORY:
1062                         e820_type = E820_RAM;
1063                         break;
1064
1065                 case EFI_ACPI_MEMORY_NVS:
1066                         e820_type = E820_NVS;
1067                         break;
1068
1069                 default:
1070                         continue;
1071                 }
1072
1073                 /* Merge adjacent mappings */
1074                 if (prev && prev->type == e820_type &&
1075                     (prev->addr + prev->size) == d->phys_addr)
1076                         prev->size += d->num_pages << 12;
1077                 else {
1078                         e820_map->addr = d->phys_addr;
1079                         e820_map->size = d->num_pages << 12;
1080                         e820_map->type = e820_type;
1081                         prev = e820_map++;
1082                         nr_entries++;
1083                 }
1084         }
1085
1086         boot_params->e820_entries = nr_entries;
1087
1088         return EFI_SUCCESS;
1089
1090 free_mem_map:
1091         low_free(_size, (unsigned long)mem_map);
1092         return status;
1093 }
1094
1095 static efi_status_t relocate_kernel(struct setup_header *hdr)
1096 {
1097         unsigned long start, nr_pages;
1098         efi_status_t status;
1099
1100         /*
1101          * The EFI firmware loader could have placed the kernel image
1102          * anywhere in memory, but the kernel has various restrictions
1103          * on the max physical address it can run at. Attempt to move
1104          * the kernel to boot_params.pref_address, or as low as
1105          * possible.
1106          */
1107         start = hdr->pref_address;
1108         nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
1109
1110         status = efi_call_phys4(sys_table->boottime->allocate_pages,
1111                                 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
1112                                 nr_pages, &start);
1113         if (status != EFI_SUCCESS) {
1114                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
1115                                    &start);
1116                 if (status != EFI_SUCCESS)
1117                         efi_printk("Failed to alloc mem for kernel\n");
1118         }
1119
1120         if (status == EFI_SUCCESS)
1121                 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1122                        hdr->init_size);
1123
1124         hdr->pref_address = hdr->code32_start;
1125         hdr->code32_start = (__u32)start;
1126
1127         return status;
1128 }
1129
1130 /*
1131  * On success we return a pointer to a boot_params structure, and NULL
1132  * on failure.
1133  */
1134 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1135                              struct boot_params *boot_params)
1136 {
1137         struct desc_ptr *gdt, *idt;
1138         efi_loaded_image_t *image;
1139         struct setup_header *hdr = &boot_params->hdr;
1140         efi_status_t status;
1141         struct desc_struct *desc;
1142
1143         sys_table = _table;
1144
1145         /* Check if we were booted by the EFI firmware */
1146         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1147                 goto fail;
1148
1149         setup_graphics(boot_params);
1150
1151         setup_efi_pci(boot_params);
1152
1153         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1154                                 EFI_LOADER_DATA, sizeof(*gdt),
1155                                 (void **)&gdt);
1156         if (status != EFI_SUCCESS) {
1157                 efi_printk("Failed to alloc mem for gdt structure\n");
1158                 goto fail;
1159         }
1160
1161         gdt->size = 0x800;
1162         status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1163         if (status != EFI_SUCCESS) {
1164                 efi_printk("Failed to alloc mem for gdt\n");
1165                 goto fail;
1166         }
1167
1168         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1169                                 EFI_LOADER_DATA, sizeof(*idt),
1170                                 (void **)&idt);
1171         if (status != EFI_SUCCESS) {
1172                 efi_printk("Failed to alloc mem for idt structure\n");
1173                 goto fail;
1174         }
1175
1176         idt->size = 0;
1177         idt->address = 0;
1178
1179         /*
1180          * If the kernel isn't already loaded at the preferred load
1181          * address, relocate it.
1182          */
1183         if (hdr->pref_address != hdr->code32_start) {
1184                 status = relocate_kernel(hdr);
1185
1186                 if (status != EFI_SUCCESS)
1187                         goto fail;
1188         }
1189
1190         status = exit_boot(boot_params, handle);
1191         if (status != EFI_SUCCESS)
1192                 goto fail;
1193
1194         memset((char *)gdt->address, 0x0, gdt->size);
1195         desc = (struct desc_struct *)gdt->address;
1196
1197         /* The first GDT is a dummy and the second is unused. */
1198         desc += 2;
1199
1200         desc->limit0 = 0xffff;
1201         desc->base0 = 0x0000;
1202         desc->base1 = 0x0000;
1203         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1204         desc->s = DESC_TYPE_CODE_DATA;
1205         desc->dpl = 0;
1206         desc->p = 1;
1207         desc->limit = 0xf;
1208         desc->avl = 0;
1209         desc->l = 0;
1210         desc->d = SEG_OP_SIZE_32BIT;
1211         desc->g = SEG_GRANULARITY_4KB;
1212         desc->base2 = 0x00;
1213
1214         desc++;
1215         desc->limit0 = 0xffff;
1216         desc->base0 = 0x0000;
1217         desc->base1 = 0x0000;
1218         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1219         desc->s = DESC_TYPE_CODE_DATA;
1220         desc->dpl = 0;
1221         desc->p = 1;
1222         desc->limit = 0xf;
1223         desc->avl = 0;
1224         desc->l = 0;
1225         desc->d = SEG_OP_SIZE_32BIT;
1226         desc->g = SEG_GRANULARITY_4KB;
1227         desc->base2 = 0x00;
1228
1229 #ifdef CONFIG_X86_64
1230         /* Task segment value */
1231         desc++;
1232         desc->limit0 = 0x0000;
1233         desc->base0 = 0x0000;
1234         desc->base1 = 0x0000;
1235         desc->type = SEG_TYPE_TSS;
1236         desc->s = 0;
1237         desc->dpl = 0;
1238         desc->p = 1;
1239         desc->limit = 0x0;
1240         desc->avl = 0;
1241         desc->l = 0;
1242         desc->d = 0;
1243         desc->g = SEG_GRANULARITY_4KB;
1244         desc->base2 = 0x00;
1245 #endif /* CONFIG_X86_64 */
1246
1247         asm volatile ("lidt %0" : : "m" (*idt));
1248         asm volatile ("lgdt %0" : : "m" (*gdt));
1249
1250         asm volatile("cli");
1251
1252         return boot_params;
1253 fail:
1254         return NULL;
1255 }