3f3d36f5a8008215c3d6190fff90c8b22558175c
[~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                 status = efi_call_phys4(pci->attributes, pci,
299                                         EfiPciIoAttributeOperationGet, 0,
300                                         &attributes);
301
302                 if (status != EFI_SUCCESS)
303                         continue;
304
305                 if (!(attributes & EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM))
306                         continue;
307
308                 if (!pci->romimage || !pci->romsize)
309                         continue;
310
311                 size = pci->romsize + sizeof(*rom);
312
313                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
314                                 EFI_LOADER_DATA, size, &rom);
315
316                 if (status != EFI_SUCCESS)
317                         continue;
318
319                 rom->data.type = SETUP_PCI;
320                 rom->data.len = size - sizeof(struct setup_data);
321                 rom->data.next = 0;
322                 rom->pcilen = pci->romsize;
323
324                 status = efi_call_phys5(pci->pci.read, pci,
325                                         EfiPciIoWidthUint16, PCI_VENDOR_ID,
326                                         1, &(rom->vendor));
327
328                 if (status != EFI_SUCCESS)
329                         goto free_struct;
330
331                 status = efi_call_phys5(pci->pci.read, pci,
332                                         EfiPciIoWidthUint16, PCI_DEVICE_ID,
333                                         1, &(rom->devid));
334
335                 if (status != EFI_SUCCESS)
336                         goto free_struct;
337
338                 status = efi_call_phys5(pci->get_location, pci,
339                                         &(rom->segment), &(rom->bus),
340                                         &(rom->device), &(rom->function));
341
342                 if (status != EFI_SUCCESS)
343                         goto free_struct;
344
345                 memcpy(rom->romdata, pci->romimage, pci->romsize);
346
347                 if (data)
348                         data->next = (unsigned long)rom;
349                 else
350                         params->hdr.setup_data = (unsigned long)rom;
351
352                 data = (struct setup_data *)rom;
353
354                 continue;
355         free_struct:
356                 efi_call_phys1(sys_table->boottime->free_pool, rom);
357         }
358
359 free_handle:
360         efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
361         return status;
362 }
363
364 /*
365  * See if we have Graphics Output Protocol
366  */
367 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
368                               unsigned long size)
369 {
370         struct efi_graphics_output_protocol *gop, *first_gop;
371         struct efi_pixel_bitmask pixel_info;
372         unsigned long nr_gops;
373         efi_status_t status;
374         void **gop_handle;
375         u16 width, height;
376         u32 fb_base, fb_size;
377         u32 pixels_per_scan_line;
378         int pixel_format;
379         int i;
380
381         status = efi_call_phys3(sys_table->boottime->allocate_pool,
382                                 EFI_LOADER_DATA, size, &gop_handle);
383         if (status != EFI_SUCCESS)
384                 return status;
385
386         status = efi_call_phys5(sys_table->boottime->locate_handle,
387                                 EFI_LOCATE_BY_PROTOCOL, proto,
388                                 NULL, &size, gop_handle);
389         if (status != EFI_SUCCESS)
390                 goto free_handle;
391
392         first_gop = NULL;
393
394         nr_gops = size / sizeof(void *);
395         for (i = 0; i < nr_gops; i++) {
396                 struct efi_graphics_output_mode_info *info;
397                 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
398                 bool conout_found = false;
399                 void *dummy;
400                 void *h = gop_handle[i];
401
402                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
403                                         h, proto, &gop);
404                 if (status != EFI_SUCCESS)
405                         continue;
406
407                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
408                                         h, &conout_proto, &dummy);
409
410                 if (status == EFI_SUCCESS)
411                         conout_found = true;
412
413                 status = efi_call_phys4(gop->query_mode, gop,
414                                         gop->mode->mode, &size, &info);
415                 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
416                         /*
417                          * Systems that use the UEFI Console Splitter may
418                          * provide multiple GOP devices, not all of which are
419                          * backed by real hardware. The workaround is to search
420                          * for a GOP implementing the ConOut protocol, and if
421                          * one isn't found, to just fall back to the first GOP.
422                          */
423                         width = info->horizontal_resolution;
424                         height = info->vertical_resolution;
425                         fb_base = gop->mode->frame_buffer_base;
426                         fb_size = gop->mode->frame_buffer_size;
427                         pixel_format = info->pixel_format;
428                         pixel_info = info->pixel_information;
429                         pixels_per_scan_line = info->pixels_per_scan_line;
430
431                         /*
432                          * Once we've found a GOP supporting ConOut,
433                          * don't bother looking any further.
434                          */
435                         if (conout_found)
436                                 break;
437
438                         first_gop = gop;
439                 }
440         }
441
442         /* Did we find any GOPs? */
443         if (!first_gop)
444                 goto free_handle;
445
446         /* EFI framebuffer */
447         si->orig_video_isVGA = VIDEO_TYPE_EFI;
448
449         si->lfb_width = width;
450         si->lfb_height = height;
451         si->lfb_base = fb_base;
452         si->pages = 1;
453
454         if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
455                 si->lfb_depth = 32;
456                 si->lfb_linelength = pixels_per_scan_line * 4;
457                 si->red_size = 8;
458                 si->red_pos = 0;
459                 si->green_size = 8;
460                 si->green_pos = 8;
461                 si->blue_size = 8;
462                 si->blue_pos = 16;
463                 si->rsvd_size = 8;
464                 si->rsvd_pos = 24;
465         } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
466                 si->lfb_depth = 32;
467                 si->lfb_linelength = pixels_per_scan_line * 4;
468                 si->red_size = 8;
469                 si->red_pos = 16;
470                 si->green_size = 8;
471                 si->green_pos = 8;
472                 si->blue_size = 8;
473                 si->blue_pos = 0;
474                 si->rsvd_size = 8;
475                 si->rsvd_pos = 24;
476         } else if (pixel_format == PIXEL_BIT_MASK) {
477                 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
478                 find_bits(pixel_info.green_mask, &si->green_pos,
479                           &si->green_size);
480                 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
481                 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
482                           &si->rsvd_size);
483                 si->lfb_depth = si->red_size + si->green_size +
484                         si->blue_size + si->rsvd_size;
485                 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
486         } else {
487                 si->lfb_depth = 4;
488                 si->lfb_linelength = si->lfb_width / 2;
489                 si->red_size = 0;
490                 si->red_pos = 0;
491                 si->green_size = 0;
492                 si->green_pos = 0;
493                 si->blue_size = 0;
494                 si->blue_pos = 0;
495                 si->rsvd_size = 0;
496                 si->rsvd_pos = 0;
497         }
498
499         si->lfb_size = si->lfb_linelength * si->lfb_height;
500
501         si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
502
503 free_handle:
504         efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
505         return status;
506 }
507
508 /*
509  * See if we have Universal Graphics Adapter (UGA) protocol
510  */
511 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
512                               unsigned long size)
513 {
514         struct efi_uga_draw_protocol *uga, *first_uga;
515         unsigned long nr_ugas;
516         efi_status_t status;
517         u32 width, height;
518         void **uga_handle = NULL;
519         int i;
520
521         status = efi_call_phys3(sys_table->boottime->allocate_pool,
522                                 EFI_LOADER_DATA, size, &uga_handle);
523         if (status != EFI_SUCCESS)
524                 return status;
525
526         status = efi_call_phys5(sys_table->boottime->locate_handle,
527                                 EFI_LOCATE_BY_PROTOCOL, uga_proto,
528                                 NULL, &size, uga_handle);
529         if (status != EFI_SUCCESS)
530                 goto free_handle;
531
532         first_uga = NULL;
533
534         nr_ugas = size / sizeof(void *);
535         for (i = 0; i < nr_ugas; i++) {
536                 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
537                 void *handle = uga_handle[i];
538                 u32 w, h, depth, refresh;
539                 void *pciio;
540
541                 status = efi_call_phys3(sys_table->boottime->handle_protocol,
542                                         handle, uga_proto, &uga);
543                 if (status != EFI_SUCCESS)
544                         continue;
545
546                 efi_call_phys3(sys_table->boottime->handle_protocol,
547                                handle, &pciio_proto, &pciio);
548
549                 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
550                                         &depth, &refresh);
551                 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
552                         width = w;
553                         height = h;
554
555                         /*
556                          * Once we've found a UGA supporting PCIIO,
557                          * don't bother looking any further.
558                          */
559                         if (pciio)
560                                 break;
561
562                         first_uga = uga;
563                 }
564         }
565
566         if (!first_uga)
567                 goto free_handle;
568
569         /* EFI framebuffer */
570         si->orig_video_isVGA = VIDEO_TYPE_EFI;
571
572         si->lfb_depth = 32;
573         si->lfb_width = width;
574         si->lfb_height = height;
575
576         si->red_size = 8;
577         si->red_pos = 16;
578         si->green_size = 8;
579         si->green_pos = 8;
580         si->blue_size = 8;
581         si->blue_pos = 0;
582         si->rsvd_size = 8;
583         si->rsvd_pos = 24;
584
585
586 free_handle:
587         efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
588         return status;
589 }
590
591 void setup_graphics(struct boot_params *boot_params)
592 {
593         efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
594         struct screen_info *si;
595         efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
596         efi_status_t status;
597         unsigned long size;
598         void **gop_handle = NULL;
599         void **uga_handle = NULL;
600
601         si = &boot_params->screen_info;
602         memset(si, 0, sizeof(*si));
603
604         size = 0;
605         status = efi_call_phys5(sys_table->boottime->locate_handle,
606                                 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
607                                 NULL, &size, gop_handle);
608         if (status == EFI_BUFFER_TOO_SMALL)
609                 status = setup_gop(si, &graphics_proto, size);
610
611         if (status != EFI_SUCCESS) {
612                 size = 0;
613                 status = efi_call_phys5(sys_table->boottime->locate_handle,
614                                         EFI_LOCATE_BY_PROTOCOL, &uga_proto,
615                                         NULL, &size, uga_handle);
616                 if (status == EFI_BUFFER_TOO_SMALL)
617                         setup_uga(si, &uga_proto, size);
618         }
619 }
620
621 struct initrd {
622         efi_file_handle_t *handle;
623         u64 size;
624 };
625
626 /*
627  * Check the cmdline for a LILO-style initrd= arguments.
628  *
629  * We only support loading an initrd from the same filesystem as the
630  * kernel image.
631  */
632 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
633                                     struct setup_header *hdr)
634 {
635         struct initrd *initrds;
636         unsigned long initrd_addr;
637         efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
638         u64 initrd_total;
639         efi_file_io_interface_t *io;
640         efi_file_handle_t *fh;
641         efi_status_t status;
642         int nr_initrds;
643         char *str;
644         int i, j, k;
645
646         initrd_addr = 0;
647         initrd_total = 0;
648
649         str = (char *)(unsigned long)hdr->cmd_line_ptr;
650
651         j = 0;                  /* See close_handles */
652
653         if (!str || !*str)
654                 return EFI_SUCCESS;
655
656         for (nr_initrds = 0; *str; nr_initrds++) {
657                 str = strstr(str, "initrd=");
658                 if (!str)
659                         break;
660
661                 str += 7;
662
663                 /* Skip any leading slashes */
664                 while (*str == '/' || *str == '\\')
665                         str++;
666
667                 while (*str && *str != ' ' && *str != '\n')
668                         str++;
669         }
670
671         if (!nr_initrds)
672                 return EFI_SUCCESS;
673
674         status = efi_call_phys3(sys_table->boottime->allocate_pool,
675                                 EFI_LOADER_DATA,
676                                 nr_initrds * sizeof(*initrds),
677                                 &initrds);
678         if (status != EFI_SUCCESS) {
679                 efi_printk("Failed to alloc mem for initrds\n");
680                 goto fail;
681         }
682
683         str = (char *)(unsigned long)hdr->cmd_line_ptr;
684         for (i = 0; i < nr_initrds; i++) {
685                 struct initrd *initrd;
686                 efi_file_handle_t *h;
687                 efi_file_info_t *info;
688                 efi_char16_t filename_16[256];
689                 unsigned long info_sz;
690                 efi_guid_t info_guid = EFI_FILE_INFO_ID;
691                 efi_char16_t *p;
692                 u64 file_sz;
693
694                 str = strstr(str, "initrd=");
695                 if (!str)
696                         break;
697
698                 str += 7;
699
700                 initrd = &initrds[i];
701                 p = filename_16;
702
703                 /* Skip any leading slashes */
704                 while (*str == '/' || *str == '\\')
705                         str++;
706
707                 while (*str && *str != ' ' && *str != '\n') {
708                         if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
709                                 break;
710
711                         *p++ = *str++;
712                 }
713
714                 *p = '\0';
715
716                 /* Only open the volume once. */
717                 if (!i) {
718                         efi_boot_services_t *boottime;
719
720                         boottime = sys_table->boottime;
721
722                         status = efi_call_phys3(boottime->handle_protocol,
723                                         image->device_handle, &fs_proto, &io);
724                         if (status != EFI_SUCCESS) {
725                                 efi_printk("Failed to handle fs_proto\n");
726                                 goto free_initrds;
727                         }
728
729                         status = efi_call_phys2(io->open_volume, io, &fh);
730                         if (status != EFI_SUCCESS) {
731                                 efi_printk("Failed to open volume\n");
732                                 goto free_initrds;
733                         }
734                 }
735
736                 status = efi_call_phys5(fh->open, fh, &h, filename_16,
737                                         EFI_FILE_MODE_READ, (u64)0);
738                 if (status != EFI_SUCCESS) {
739                         efi_printk("Failed to open initrd file\n");
740                         goto close_handles;
741                 }
742
743                 initrd->handle = h;
744
745                 info_sz = 0;
746                 status = efi_call_phys4(h->get_info, h, &info_guid,
747                                         &info_sz, NULL);
748                 if (status != EFI_BUFFER_TOO_SMALL) {
749                         efi_printk("Failed to get initrd info size\n");
750                         goto close_handles;
751                 }
752
753 grow:
754                 status = efi_call_phys3(sys_table->boottime->allocate_pool,
755                                         EFI_LOADER_DATA, info_sz, &info);
756                 if (status != EFI_SUCCESS) {
757                         efi_printk("Failed to alloc mem for initrd info\n");
758                         goto close_handles;
759                 }
760
761                 status = efi_call_phys4(h->get_info, h, &info_guid,
762                                         &info_sz, info);
763                 if (status == EFI_BUFFER_TOO_SMALL) {
764                         efi_call_phys1(sys_table->boottime->free_pool, info);
765                         goto grow;
766                 }
767
768                 file_sz = info->file_size;
769                 efi_call_phys1(sys_table->boottime->free_pool, info);
770
771                 if (status != EFI_SUCCESS) {
772                         efi_printk("Failed to get initrd info\n");
773                         goto close_handles;
774                 }
775
776                 initrd->size = file_sz;
777                 initrd_total += file_sz;
778         }
779
780         if (initrd_total) {
781                 unsigned long addr;
782
783                 /*
784                  * Multiple initrd's need to be at consecutive
785                  * addresses in memory, so allocate enough memory for
786                  * all the initrd's.
787                  */
788                 status = high_alloc(initrd_total, 0x1000,
789                                    &initrd_addr, hdr->initrd_addr_max);
790                 if (status != EFI_SUCCESS) {
791                         efi_printk("Failed to alloc highmem for initrds\n");
792                         goto close_handles;
793                 }
794
795                 /* We've run out of free low memory. */
796                 if (initrd_addr > hdr->initrd_addr_max) {
797                         efi_printk("We've run out of free low memory\n");
798                         status = EFI_INVALID_PARAMETER;
799                         goto free_initrd_total;
800                 }
801
802                 addr = initrd_addr;
803                 for (j = 0; j < nr_initrds; j++) {
804                         u64 size;
805
806                         size = initrds[j].size;
807                         while (size) {
808                                 u64 chunksize;
809                                 if (size > EFI_READ_CHUNK_SIZE)
810                                         chunksize = EFI_READ_CHUNK_SIZE;
811                                 else
812                                         chunksize = size;
813                                 status = efi_call_phys3(fh->read,
814                                                         initrds[j].handle,
815                                                         &chunksize, addr);
816                                 if (status != EFI_SUCCESS) {
817                                         efi_printk("Failed to read initrd\n");
818                                         goto free_initrd_total;
819                                 }
820                                 addr += chunksize;
821                                 size -= chunksize;
822                         }
823
824                         efi_call_phys1(fh->close, initrds[j].handle);
825                 }
826
827         }
828
829         efi_call_phys1(sys_table->boottime->free_pool, initrds);
830
831         hdr->ramdisk_image = initrd_addr;
832         hdr->ramdisk_size = initrd_total;
833
834         return status;
835
836 free_initrd_total:
837         low_free(initrd_total, initrd_addr);
838
839 close_handles:
840         for (k = j; k < i; k++)
841                 efi_call_phys1(fh->close, initrds[k].handle);
842 free_initrds:
843         efi_call_phys1(sys_table->boottime->free_pool, initrds);
844 fail:
845         hdr->ramdisk_image = 0;
846         hdr->ramdisk_size = 0;
847
848         return status;
849 }
850
851 /*
852  * Because the x86 boot code expects to be passed a boot_params we
853  * need to create one ourselves (usually the bootloader would create
854  * one for us).
855  */
856 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
857 {
858         struct boot_params *boot_params;
859         struct sys_desc_table *sdt;
860         struct apm_bios_info *bi;
861         struct setup_header *hdr;
862         struct efi_info *efi;
863         efi_loaded_image_t *image;
864         void *options;
865         u32 load_options_size;
866         efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
867         int options_size = 0;
868         efi_status_t status;
869         unsigned long cmdline;
870         u16 *s2;
871         u8 *s1;
872         int i;
873
874         sys_table = _table;
875
876         /* Check if we were booted by the EFI firmware */
877         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
878                 return NULL;
879
880         status = efi_call_phys3(sys_table->boottime->handle_protocol,
881                                 handle, &proto, (void *)&image);
882         if (status != EFI_SUCCESS) {
883                 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
884                 return NULL;
885         }
886
887         status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
888         if (status != EFI_SUCCESS) {
889                 efi_printk("Failed to alloc lowmem for boot params\n");
890                 return NULL;
891         }
892
893         memset(boot_params, 0x0, 0x4000);
894
895         hdr = &boot_params->hdr;
896         efi = &boot_params->efi_info;
897         bi = &boot_params->apm_bios_info;
898         sdt = &boot_params->sys_desc_table;
899
900         /* Copy the second sector to boot_params */
901         memcpy(&hdr->jump, image->image_base + 512, 512);
902
903         /*
904          * Fill out some of the header fields ourselves because the
905          * EFI firmware loader doesn't load the first sector.
906          */
907         hdr->root_flags = 1;
908         hdr->vid_mode = 0xffff;
909         hdr->boot_flag = 0xAA55;
910
911         hdr->code32_start = (__u64)(unsigned long)image->image_base;
912
913         hdr->type_of_loader = 0x21;
914
915         /* Convert unicode cmdline to ascii */
916         options = image->load_options;
917         load_options_size = image->load_options_size / 2; /* ASCII */
918         cmdline = 0;
919         s2 = (u16 *)options;
920
921         if (s2) {
922                 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
923                         s2++;
924                         options_size++;
925                 }
926
927                 if (options_size) {
928                         if (options_size > hdr->cmdline_size)
929                                 options_size = hdr->cmdline_size;
930
931                         options_size++; /* NUL termination */
932
933                         status = low_alloc(options_size, 1, &cmdline);
934                         if (status != EFI_SUCCESS) {
935                                 efi_printk("Failed to alloc mem for cmdline\n");
936                                 goto fail;
937                         }
938
939                         s1 = (u8 *)(unsigned long)cmdline;
940                         s2 = (u16 *)options;
941
942                         for (i = 0; i < options_size - 1; i++)
943                                 *s1++ = *s2++;
944
945                         *s1 = '\0';
946                 }
947         }
948
949         hdr->cmd_line_ptr = cmdline;
950
951         hdr->ramdisk_image = 0;
952         hdr->ramdisk_size = 0;
953
954         /* Clear APM BIOS info */
955         memset(bi, 0, sizeof(*bi));
956
957         memset(sdt, 0, sizeof(*sdt));
958
959         status = handle_ramdisks(image, hdr);
960         if (status != EFI_SUCCESS)
961                 goto fail2;
962
963         return boot_params;
964 fail2:
965         if (options_size)
966                 low_free(options_size, hdr->cmd_line_ptr);
967 fail:
968         low_free(0x4000, (unsigned long)boot_params);
969         return NULL;
970 }
971
972 static efi_status_t exit_boot(struct boot_params *boot_params,
973                               void *handle)
974 {
975         struct efi_info *efi = &boot_params->efi_info;
976         struct e820entry *e820_map = &boot_params->e820_map[0];
977         struct e820entry *prev = NULL;
978         unsigned long size, key, desc_size, _size;
979         efi_memory_desc_t *mem_map;
980         efi_status_t status;
981         __u32 desc_version;
982         u8 nr_entries;
983         int i;
984
985         size = sizeof(*mem_map) * 32;
986
987 again:
988         size += sizeof(*mem_map);
989         _size = size;
990         status = low_alloc(size, 1, (unsigned long *)&mem_map);
991         if (status != EFI_SUCCESS)
992                 return status;
993
994         status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
995                                 mem_map, &key, &desc_size, &desc_version);
996         if (status == EFI_BUFFER_TOO_SMALL) {
997                 low_free(_size, (unsigned long)mem_map);
998                 goto again;
999         }
1000
1001         if (status != EFI_SUCCESS)
1002                 goto free_mem_map;
1003
1004         memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
1005         efi->efi_systab = (unsigned long)sys_table;
1006         efi->efi_memdesc_size = desc_size;
1007         efi->efi_memdesc_version = desc_version;
1008         efi->efi_memmap = (unsigned long)mem_map;
1009         efi->efi_memmap_size = size;
1010
1011 #ifdef CONFIG_X86_64
1012         efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1013         efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1014 #endif
1015
1016         /* Might as well exit boot services now */
1017         status = efi_call_phys2(sys_table->boottime->exit_boot_services,
1018                                 handle, key);
1019         if (status != EFI_SUCCESS)
1020                 goto free_mem_map;
1021
1022         /* Historic? */
1023         boot_params->alt_mem_k = 32 * 1024;
1024
1025         /*
1026          * Convert the EFI memory map to E820.
1027          */
1028         nr_entries = 0;
1029         for (i = 0; i < size / desc_size; i++) {
1030                 efi_memory_desc_t *d;
1031                 unsigned int e820_type = 0;
1032                 unsigned long m = (unsigned long)mem_map;
1033
1034                 d = (efi_memory_desc_t *)(m + (i * desc_size));
1035                 switch (d->type) {
1036                 case EFI_RESERVED_TYPE:
1037                 case EFI_RUNTIME_SERVICES_CODE:
1038                 case EFI_RUNTIME_SERVICES_DATA:
1039                 case EFI_MEMORY_MAPPED_IO:
1040                 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1041                 case EFI_PAL_CODE:
1042                         e820_type = E820_RESERVED;
1043                         break;
1044
1045                 case EFI_UNUSABLE_MEMORY:
1046                         e820_type = E820_UNUSABLE;
1047                         break;
1048
1049                 case EFI_ACPI_RECLAIM_MEMORY:
1050                         e820_type = E820_ACPI;
1051                         break;
1052
1053                 case EFI_LOADER_CODE:
1054                 case EFI_LOADER_DATA:
1055                 case EFI_BOOT_SERVICES_CODE:
1056                 case EFI_BOOT_SERVICES_DATA:
1057                 case EFI_CONVENTIONAL_MEMORY:
1058                         e820_type = E820_RAM;
1059                         break;
1060
1061                 case EFI_ACPI_MEMORY_NVS:
1062                         e820_type = E820_NVS;
1063                         break;
1064
1065                 default:
1066                         continue;
1067                 }
1068
1069                 /* Merge adjacent mappings */
1070                 if (prev && prev->type == e820_type &&
1071                     (prev->addr + prev->size) == d->phys_addr)
1072                         prev->size += d->num_pages << 12;
1073                 else {
1074                         e820_map->addr = d->phys_addr;
1075                         e820_map->size = d->num_pages << 12;
1076                         e820_map->type = e820_type;
1077                         prev = e820_map++;
1078                         nr_entries++;
1079                 }
1080         }
1081
1082         boot_params->e820_entries = nr_entries;
1083
1084         return EFI_SUCCESS;
1085
1086 free_mem_map:
1087         low_free(_size, (unsigned long)mem_map);
1088         return status;
1089 }
1090
1091 static efi_status_t relocate_kernel(struct setup_header *hdr)
1092 {
1093         unsigned long start, nr_pages;
1094         efi_status_t status;
1095
1096         /*
1097          * The EFI firmware loader could have placed the kernel image
1098          * anywhere in memory, but the kernel has various restrictions
1099          * on the max physical address it can run at. Attempt to move
1100          * the kernel to boot_params.pref_address, or as low as
1101          * possible.
1102          */
1103         start = hdr->pref_address;
1104         nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
1105
1106         status = efi_call_phys4(sys_table->boottime->allocate_pages,
1107                                 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
1108                                 nr_pages, &start);
1109         if (status != EFI_SUCCESS) {
1110                 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
1111                                    &start);
1112                 if (status != EFI_SUCCESS)
1113                         efi_printk("Failed to alloc mem for kernel\n");
1114         }
1115
1116         if (status == EFI_SUCCESS)
1117                 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1118                        hdr->init_size);
1119
1120         hdr->pref_address = hdr->code32_start;
1121         hdr->code32_start = (__u32)start;
1122
1123         return status;
1124 }
1125
1126 /*
1127  * On success we return a pointer to a boot_params structure, and NULL
1128  * on failure.
1129  */
1130 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1131                              struct boot_params *boot_params)
1132 {
1133         struct desc_ptr *gdt, *idt;
1134         efi_loaded_image_t *image;
1135         struct setup_header *hdr = &boot_params->hdr;
1136         efi_status_t status;
1137         struct desc_struct *desc;
1138
1139         sys_table = _table;
1140
1141         /* Check if we were booted by the EFI firmware */
1142         if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1143                 goto fail;
1144
1145         setup_graphics(boot_params);
1146
1147         setup_efi_pci(boot_params);
1148
1149         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1150                                 EFI_LOADER_DATA, sizeof(*gdt),
1151                                 (void **)&gdt);
1152         if (status != EFI_SUCCESS) {
1153                 efi_printk("Failed to alloc mem for gdt structure\n");
1154                 goto fail;
1155         }
1156
1157         gdt->size = 0x800;
1158         status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1159         if (status != EFI_SUCCESS) {
1160                 efi_printk("Failed to alloc mem for gdt\n");
1161                 goto fail;
1162         }
1163
1164         status = efi_call_phys3(sys_table->boottime->allocate_pool,
1165                                 EFI_LOADER_DATA, sizeof(*idt),
1166                                 (void **)&idt);
1167         if (status != EFI_SUCCESS) {
1168                 efi_printk("Failed to alloc mem for idt structure\n");
1169                 goto fail;
1170         }
1171
1172         idt->size = 0;
1173         idt->address = 0;
1174
1175         /*
1176          * If the kernel isn't already loaded at the preferred load
1177          * address, relocate it.
1178          */
1179         if (hdr->pref_address != hdr->code32_start) {
1180                 status = relocate_kernel(hdr);
1181
1182                 if (status != EFI_SUCCESS)
1183                         goto fail;
1184         }
1185
1186         status = exit_boot(boot_params, handle);
1187         if (status != EFI_SUCCESS)
1188                 goto fail;
1189
1190         memset((char *)gdt->address, 0x0, gdt->size);
1191         desc = (struct desc_struct *)gdt->address;
1192
1193         /* The first GDT is a dummy and the second is unused. */
1194         desc += 2;
1195
1196         desc->limit0 = 0xffff;
1197         desc->base0 = 0x0000;
1198         desc->base1 = 0x0000;
1199         desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1200         desc->s = DESC_TYPE_CODE_DATA;
1201         desc->dpl = 0;
1202         desc->p = 1;
1203         desc->limit = 0xf;
1204         desc->avl = 0;
1205         desc->l = 0;
1206         desc->d = SEG_OP_SIZE_32BIT;
1207         desc->g = SEG_GRANULARITY_4KB;
1208         desc->base2 = 0x00;
1209
1210         desc++;
1211         desc->limit0 = 0xffff;
1212         desc->base0 = 0x0000;
1213         desc->base1 = 0x0000;
1214         desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1215         desc->s = DESC_TYPE_CODE_DATA;
1216         desc->dpl = 0;
1217         desc->p = 1;
1218         desc->limit = 0xf;
1219         desc->avl = 0;
1220         desc->l = 0;
1221         desc->d = SEG_OP_SIZE_32BIT;
1222         desc->g = SEG_GRANULARITY_4KB;
1223         desc->base2 = 0x00;
1224
1225 #ifdef CONFIG_X86_64
1226         /* Task segment value */
1227         desc++;
1228         desc->limit0 = 0x0000;
1229         desc->base0 = 0x0000;
1230         desc->base1 = 0x0000;
1231         desc->type = SEG_TYPE_TSS;
1232         desc->s = 0;
1233         desc->dpl = 0;
1234         desc->p = 1;
1235         desc->limit = 0x0;
1236         desc->avl = 0;
1237         desc->l = 0;
1238         desc->d = 0;
1239         desc->g = SEG_GRANULARITY_4KB;
1240         desc->base2 = 0x00;
1241 #endif /* CONFIG_X86_64 */
1242
1243         asm volatile ("lidt %0" : : "m" (*idt));
1244         asm volatile ("lgdt %0" : : "m" (*gdt));
1245
1246         asm volatile("cli");
1247
1248         return boot_params;
1249 fail:
1250         return NULL;
1251 }