1 /* -----------------------------------------------------------------------
3 * Copyright 2011 Intel Corporation; author Matt Fleming
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.
8 * ----------------------------------------------------------------------- */
10 #include <linux/efi.h>
11 #include <linux/pci.h>
13 #include <asm/setup.h>
16 #undef memcpy /* Use memcpy from misc.c */
20 static efi_system_table_t *sys_table;
22 static void efi_printk(char *str)
26 for (s8 = str; *s8; s8++) {
27 struct efi_simple_text_output_protocol *out;
28 efi_char16_t ch[2] = { 0 };
31 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
34 efi_char16_t nl[2] = { '\r', 0 };
35 efi_call_phys2(out->output_string, out, nl);
38 efi_call_phys2(out->output_string, out, ch);
42 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
43 unsigned long *desc_size)
45 efi_memory_desc_t *m = NULL;
50 *map_size = sizeof(*m) * 32;
53 * Add an additional efi_memory_desc_t because we're doing an
54 * allocation which may be in a new descriptor region.
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)
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);
69 if (status != EFI_SUCCESS)
70 efi_call_phys1(sys_table->boottime->free_pool, m);
78 * Allocate at the highest possible address that is not above 'max'.
80 static efi_status_t high_alloc(unsigned long size, unsigned long align,
81 unsigned long *addr, unsigned long max)
83 unsigned long map_size, desc_size;
84 efi_memory_desc_t *map;
86 unsigned long nr_pages;
90 status = __get_map(&map, &map_size, &desc_size);
91 if (status != EFI_SUCCESS)
94 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
96 for (i = 0; i < map_size / desc_size; i++) {
97 efi_memory_desc_t *desc;
98 unsigned long m = (unsigned long)map;
101 desc = (efi_memory_desc_t *)(m + (i * desc_size));
102 if (desc->type != EFI_CONVENTIONAL_MEMORY)
105 if (desc->num_pages < nr_pages)
108 start = desc->phys_addr;
109 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
111 if ((start + size) > end || (start + size) > max)
114 if (end - size > max)
117 if (round_down(end - size, align) < start)
120 start = round_down(end - size, align);
123 * Don't allocate at 0x0. It will confuse code that
124 * checks pointers against NULL.
129 if (start > max_addr)
134 status = EFI_NOT_FOUND;
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) {
149 efi_call_phys1(sys_table->boottime->free_pool, map);
156 * Allocate at the lowest possible address.
158 static efi_status_t low_alloc(unsigned long size, unsigned long align,
161 unsigned long map_size, desc_size;
162 efi_memory_desc_t *map;
164 unsigned long nr_pages;
167 status = __get_map(&map, &map_size, &desc_size);
168 if (status != EFI_SUCCESS)
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;
177 desc = (efi_memory_desc_t *)(m + (i * desc_size));
179 if (desc->type != EFI_CONVENTIONAL_MEMORY)
182 if (desc->num_pages < nr_pages)
185 start = desc->phys_addr;
186 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
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.
196 start = round_up(start, align);
197 if ((start + size) > end)
200 status = efi_call_phys4(sys_table->boottime->allocate_pages,
201 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
203 if (status == EFI_SUCCESS) {
209 if (i == map_size / desc_size)
210 status = EFI_NOT_FOUND;
213 efi_call_phys1(sys_table->boottime->free_pool, map);
218 static void low_free(unsigned long size, unsigned long addr)
220 unsigned long nr_pages;
222 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
223 efi_call_phys2(sys_table->boottime->free_pages, addr, size);
226 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
234 while (!(mask & 0x1)) {
249 static efi_status_t setup_efi_pci(struct boot_params *params)
251 efi_pci_io_protocol *pci;
254 efi_guid_t pci_proto = EFI_PCI_IO_PROTOCOL_GUID;
255 unsigned long nr_pci, size = 0;
257 struct setup_data *data;
259 data = (struct setup_data *)(unsigned long)params->hdr.setup_data;
261 while (data && data->next)
262 data = (struct setup_data *)(unsigned long)data->next;
264 status = efi_call_phys5(sys_table->boottime->locate_handle,
265 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
266 NULL, &size, pci_handle);
268 if (status == EFI_BUFFER_TOO_SMALL) {
269 status = efi_call_phys3(sys_table->boottime->allocate_pool,
270 EFI_LOADER_DATA, size, &pci_handle);
272 if (status != EFI_SUCCESS)
275 status = efi_call_phys5(sys_table->boottime->locate_handle,
276 EFI_LOCATE_BY_PROTOCOL, &pci_proto,
277 NULL, &size, pci_handle);
280 if (status != EFI_SUCCESS)
283 nr_pci = size / sizeof(void *);
284 for (i = 0; i < nr_pci; i++) {
285 void *h = pci_handle[i];
287 struct pci_setup_rom *rom;
289 status = efi_call_phys3(sys_table->boottime->handle_protocol,
290 h, &pci_proto, &pci);
292 if (status != EFI_SUCCESS)
299 status = efi_call_phys4(pci->attributes, pci,
300 EfiPciIoAttributeOperationGet, 0,
303 status = efi_call_phys5(pci->attributes, pci,
304 EfiPciIoAttributeOperationGet, 0, 0,
307 if (status != EFI_SUCCESS)
310 if (!pci->romimage || !pci->romsize)
313 size = pci->romsize + sizeof(*rom);
315 status = efi_call_phys3(sys_table->boottime->allocate_pool,
316 EFI_LOADER_DATA, size, &rom);
318 if (status != EFI_SUCCESS)
321 rom->data.type = SETUP_PCI;
322 rom->data.len = size - sizeof(struct setup_data);
324 rom->pcilen = pci->romsize;
326 status = efi_call_phys5(pci->pci.read, pci,
327 EfiPciIoWidthUint16, PCI_VENDOR_ID,
330 if (status != EFI_SUCCESS)
333 status = efi_call_phys5(pci->pci.read, pci,
334 EfiPciIoWidthUint16, PCI_DEVICE_ID,
337 if (status != EFI_SUCCESS)
340 status = efi_call_phys5(pci->get_location, pci,
341 &(rom->segment), &(rom->bus),
342 &(rom->device), &(rom->function));
344 if (status != EFI_SUCCESS)
347 memcpy(rom->romdata, pci->romimage, pci->romsize);
350 data->next = (unsigned long)rom;
352 params->hdr.setup_data = (unsigned long)rom;
354 data = (struct setup_data *)rom;
358 efi_call_phys1(sys_table->boottime->free_pool, rom);
362 efi_call_phys1(sys_table->boottime->free_pool, pci_handle);
367 * See if we have Graphics Output Protocol
369 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
372 struct efi_graphics_output_protocol *gop, *first_gop;
373 struct efi_pixel_bitmask pixel_info;
374 unsigned long nr_gops;
378 u32 fb_base, fb_size;
379 u32 pixels_per_scan_line;
383 status = efi_call_phys3(sys_table->boottime->allocate_pool,
384 EFI_LOADER_DATA, size, &gop_handle);
385 if (status != EFI_SUCCESS)
388 status = efi_call_phys5(sys_table->boottime->locate_handle,
389 EFI_LOCATE_BY_PROTOCOL, proto,
390 NULL, &size, gop_handle);
391 if (status != EFI_SUCCESS)
396 nr_gops = size / sizeof(void *);
397 for (i = 0; i < nr_gops; i++) {
398 struct efi_graphics_output_mode_info *info;
399 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
400 bool conout_found = false;
402 void *h = gop_handle[i];
404 status = efi_call_phys3(sys_table->boottime->handle_protocol,
406 if (status != EFI_SUCCESS)
409 status = efi_call_phys3(sys_table->boottime->handle_protocol,
410 h, &conout_proto, &dummy);
412 if (status == EFI_SUCCESS)
415 status = efi_call_phys4(gop->query_mode, gop,
416 gop->mode->mode, &size, &info);
417 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
419 * Systems that use the UEFI Console Splitter may
420 * provide multiple GOP devices, not all of which are
421 * backed by real hardware. The workaround is to search
422 * for a GOP implementing the ConOut protocol, and if
423 * one isn't found, to just fall back to the first GOP.
425 width = info->horizontal_resolution;
426 height = info->vertical_resolution;
427 fb_base = gop->mode->frame_buffer_base;
428 fb_size = gop->mode->frame_buffer_size;
429 pixel_format = info->pixel_format;
430 pixel_info = info->pixel_information;
431 pixels_per_scan_line = info->pixels_per_scan_line;
434 * Once we've found a GOP supporting ConOut,
435 * don't bother looking any further.
443 /* Did we find any GOPs? */
447 /* EFI framebuffer */
448 si->orig_video_isVGA = VIDEO_TYPE_EFI;
450 si->lfb_width = width;
451 si->lfb_height = height;
452 si->lfb_base = fb_base;
455 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
457 si->lfb_linelength = pixels_per_scan_line * 4;
466 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
468 si->lfb_linelength = pixels_per_scan_line * 4;
477 } else if (pixel_format == PIXEL_BIT_MASK) {
478 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
479 find_bits(pixel_info.green_mask, &si->green_pos,
481 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
482 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
484 si->lfb_depth = si->red_size + si->green_size +
485 si->blue_size + si->rsvd_size;
486 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
489 si->lfb_linelength = si->lfb_width / 2;
500 si->lfb_size = si->lfb_linelength * si->lfb_height;
502 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
505 efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
510 * See if we have Universal Graphics Adapter (UGA) protocol
512 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
515 struct efi_uga_draw_protocol *uga, *first_uga;
516 unsigned long nr_ugas;
519 void **uga_handle = NULL;
522 status = efi_call_phys3(sys_table->boottime->allocate_pool,
523 EFI_LOADER_DATA, size, &uga_handle);
524 if (status != EFI_SUCCESS)
527 status = efi_call_phys5(sys_table->boottime->locate_handle,
528 EFI_LOCATE_BY_PROTOCOL, uga_proto,
529 NULL, &size, uga_handle);
530 if (status != EFI_SUCCESS)
535 nr_ugas = size / sizeof(void *);
536 for (i = 0; i < nr_ugas; i++) {
537 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
538 void *handle = uga_handle[i];
539 u32 w, h, depth, refresh;
542 status = efi_call_phys3(sys_table->boottime->handle_protocol,
543 handle, uga_proto, &uga);
544 if (status != EFI_SUCCESS)
547 efi_call_phys3(sys_table->boottime->handle_protocol,
548 handle, &pciio_proto, &pciio);
550 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
552 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
557 * Once we've found a UGA supporting PCIIO,
558 * don't bother looking any further.
570 /* EFI framebuffer */
571 si->orig_video_isVGA = VIDEO_TYPE_EFI;
574 si->lfb_width = width;
575 si->lfb_height = height;
588 efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
592 void setup_graphics(struct boot_params *boot_params)
594 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
595 struct screen_info *si;
596 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
599 void **gop_handle = NULL;
600 void **uga_handle = NULL;
602 si = &boot_params->screen_info;
603 memset(si, 0, sizeof(*si));
606 status = efi_call_phys5(sys_table->boottime->locate_handle,
607 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
608 NULL, &size, gop_handle);
609 if (status == EFI_BUFFER_TOO_SMALL)
610 status = setup_gop(si, &graphics_proto, size);
612 if (status != EFI_SUCCESS) {
614 status = efi_call_phys5(sys_table->boottime->locate_handle,
615 EFI_LOCATE_BY_PROTOCOL, &uga_proto,
616 NULL, &size, uga_handle);
617 if (status == EFI_BUFFER_TOO_SMALL)
618 setup_uga(si, &uga_proto, size);
623 efi_file_handle_t *handle;
628 * Check the cmdline for a LILO-style initrd= arguments.
630 * We only support loading an initrd from the same filesystem as the
633 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
634 struct setup_header *hdr)
636 struct initrd *initrds;
637 unsigned long initrd_addr;
638 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
640 efi_file_io_interface_t *io;
641 efi_file_handle_t *fh;
650 str = (char *)(unsigned long)hdr->cmd_line_ptr;
652 j = 0; /* See close_handles */
657 for (nr_initrds = 0; *str; nr_initrds++) {
658 str = strstr(str, "initrd=");
664 /* Skip any leading slashes */
665 while (*str == '/' || *str == '\\')
668 while (*str && *str != ' ' && *str != '\n')
675 status = efi_call_phys3(sys_table->boottime->allocate_pool,
677 nr_initrds * sizeof(*initrds),
679 if (status != EFI_SUCCESS) {
680 efi_printk("Failed to alloc mem for initrds\n");
684 str = (char *)(unsigned long)hdr->cmd_line_ptr;
685 for (i = 0; i < nr_initrds; i++) {
686 struct initrd *initrd;
687 efi_file_handle_t *h;
688 efi_file_info_t *info;
689 efi_char16_t filename_16[256];
690 unsigned long info_sz;
691 efi_guid_t info_guid = EFI_FILE_INFO_ID;
695 str = strstr(str, "initrd=");
701 initrd = &initrds[i];
704 /* Skip any leading slashes */
705 while (*str == '/' || *str == '\\')
708 while (*str && *str != ' ' && *str != '\n') {
709 if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
717 /* Only open the volume once. */
719 efi_boot_services_t *boottime;
721 boottime = sys_table->boottime;
723 status = efi_call_phys3(boottime->handle_protocol,
724 image->device_handle, &fs_proto, &io);
725 if (status != EFI_SUCCESS) {
726 efi_printk("Failed to handle fs_proto\n");
730 status = efi_call_phys2(io->open_volume, io, &fh);
731 if (status != EFI_SUCCESS) {
732 efi_printk("Failed to open volume\n");
737 status = efi_call_phys5(fh->open, fh, &h, filename_16,
738 EFI_FILE_MODE_READ, (u64)0);
739 if (status != EFI_SUCCESS) {
740 efi_printk("Failed to open initrd file\n");
747 status = efi_call_phys4(h->get_info, h, &info_guid,
749 if (status != EFI_BUFFER_TOO_SMALL) {
750 efi_printk("Failed to get initrd info size\n");
755 status = efi_call_phys3(sys_table->boottime->allocate_pool,
756 EFI_LOADER_DATA, info_sz, &info);
757 if (status != EFI_SUCCESS) {
758 efi_printk("Failed to alloc mem for initrd info\n");
762 status = efi_call_phys4(h->get_info, h, &info_guid,
764 if (status == EFI_BUFFER_TOO_SMALL) {
765 efi_call_phys1(sys_table->boottime->free_pool, info);
769 file_sz = info->file_size;
770 efi_call_phys1(sys_table->boottime->free_pool, info);
772 if (status != EFI_SUCCESS) {
773 efi_printk("Failed to get initrd info\n");
777 initrd->size = file_sz;
778 initrd_total += file_sz;
785 * Multiple initrd's need to be at consecutive
786 * addresses in memory, so allocate enough memory for
789 status = high_alloc(initrd_total, 0x1000,
790 &initrd_addr, hdr->initrd_addr_max);
791 if (status != EFI_SUCCESS) {
792 efi_printk("Failed to alloc highmem for initrds\n");
796 /* We've run out of free low memory. */
797 if (initrd_addr > hdr->initrd_addr_max) {
798 efi_printk("We've run out of free low memory\n");
799 status = EFI_INVALID_PARAMETER;
800 goto free_initrd_total;
804 for (j = 0; j < nr_initrds; j++) {
807 size = initrds[j].size;
810 if (size > EFI_READ_CHUNK_SIZE)
811 chunksize = EFI_READ_CHUNK_SIZE;
814 status = efi_call_phys3(fh->read,
817 if (status != EFI_SUCCESS) {
818 efi_printk("Failed to read initrd\n");
819 goto free_initrd_total;
825 efi_call_phys1(fh->close, initrds[j].handle);
830 efi_call_phys1(sys_table->boottime->free_pool, initrds);
832 hdr->ramdisk_image = initrd_addr;
833 hdr->ramdisk_size = initrd_total;
838 low_free(initrd_total, initrd_addr);
841 for (k = j; k < i; k++)
842 efi_call_phys1(fh->close, initrds[k].handle);
844 efi_call_phys1(sys_table->boottime->free_pool, initrds);
846 hdr->ramdisk_image = 0;
847 hdr->ramdisk_size = 0;
853 * Because the x86 boot code expects to be passed a boot_params we
854 * need to create one ourselves (usually the bootloader would create
857 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
859 struct boot_params *boot_params;
860 struct sys_desc_table *sdt;
861 struct apm_bios_info *bi;
862 struct setup_header *hdr;
863 struct efi_info *efi;
864 efi_loaded_image_t *image;
866 u32 load_options_size;
867 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
868 int options_size = 0;
870 unsigned long cmdline;
877 /* Check if we were booted by the EFI firmware */
878 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
881 status = efi_call_phys3(sys_table->boottime->handle_protocol,
882 handle, &proto, (void *)&image);
883 if (status != EFI_SUCCESS) {
884 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
888 status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
889 if (status != EFI_SUCCESS) {
890 efi_printk("Failed to alloc lowmem for boot params\n");
894 memset(boot_params, 0x0, 0x4000);
896 hdr = &boot_params->hdr;
897 efi = &boot_params->efi_info;
898 bi = &boot_params->apm_bios_info;
899 sdt = &boot_params->sys_desc_table;
901 /* Copy the second sector to boot_params */
902 memcpy(&hdr->jump, image->image_base + 512, 512);
905 * Fill out some of the header fields ourselves because the
906 * EFI firmware loader doesn't load the first sector.
909 hdr->vid_mode = 0xffff;
910 hdr->boot_flag = 0xAA55;
912 hdr->code32_start = (__u64)(unsigned long)image->image_base;
914 hdr->type_of_loader = 0x21;
916 /* Convert unicode cmdline to ascii */
917 options = image->load_options;
918 load_options_size = image->load_options_size / 2; /* ASCII */
923 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
929 if (options_size > hdr->cmdline_size)
930 options_size = hdr->cmdline_size;
932 options_size++; /* NUL termination */
934 status = low_alloc(options_size, 1, &cmdline);
935 if (status != EFI_SUCCESS) {
936 efi_printk("Failed to alloc mem for cmdline\n");
940 s1 = (u8 *)(unsigned long)cmdline;
943 for (i = 0; i < options_size - 1; i++)
950 hdr->cmd_line_ptr = cmdline;
952 hdr->ramdisk_image = 0;
953 hdr->ramdisk_size = 0;
955 /* Clear APM BIOS info */
956 memset(bi, 0, sizeof(*bi));
958 memset(sdt, 0, sizeof(*sdt));
960 status = handle_ramdisks(image, hdr);
961 if (status != EFI_SUCCESS)
967 low_free(options_size, hdr->cmd_line_ptr);
969 low_free(0x4000, (unsigned long)boot_params);
973 static efi_status_t exit_boot(struct boot_params *boot_params,
976 struct efi_info *efi = &boot_params->efi_info;
977 struct e820entry *e820_map = &boot_params->e820_map[0];
978 struct e820entry *prev = NULL;
979 unsigned long size, key, desc_size, _size;
980 efi_memory_desc_t *mem_map;
986 size = sizeof(*mem_map) * 32;
989 size += sizeof(*mem_map);
991 status = low_alloc(size, 1, (unsigned long *)&mem_map);
992 if (status != EFI_SUCCESS)
995 status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
996 mem_map, &key, &desc_size, &desc_version);
997 if (status == EFI_BUFFER_TOO_SMALL) {
998 low_free(_size, (unsigned long)mem_map);
1002 if (status != EFI_SUCCESS)
1005 memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
1006 efi->efi_systab = (unsigned long)sys_table;
1007 efi->efi_memdesc_size = desc_size;
1008 efi->efi_memdesc_version = desc_version;
1009 efi->efi_memmap = (unsigned long)mem_map;
1010 efi->efi_memmap_size = size;
1012 #ifdef CONFIG_X86_64
1013 efi->efi_systab_hi = (unsigned long)sys_table >> 32;
1014 efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
1017 /* Might as well exit boot services now */
1018 status = efi_call_phys2(sys_table->boottime->exit_boot_services,
1020 if (status != EFI_SUCCESS)
1024 boot_params->alt_mem_k = 32 * 1024;
1027 * Convert the EFI memory map to E820.
1030 for (i = 0; i < size / desc_size; i++) {
1031 efi_memory_desc_t *d;
1032 unsigned int e820_type = 0;
1033 unsigned long m = (unsigned long)mem_map;
1035 d = (efi_memory_desc_t *)(m + (i * desc_size));
1037 case EFI_RESERVED_TYPE:
1038 case EFI_RUNTIME_SERVICES_CODE:
1039 case EFI_RUNTIME_SERVICES_DATA:
1040 case EFI_MEMORY_MAPPED_IO:
1041 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
1043 e820_type = E820_RESERVED;
1046 case EFI_UNUSABLE_MEMORY:
1047 e820_type = E820_UNUSABLE;
1050 case EFI_ACPI_RECLAIM_MEMORY:
1051 e820_type = E820_ACPI;
1054 case EFI_LOADER_CODE:
1055 case EFI_LOADER_DATA:
1056 case EFI_BOOT_SERVICES_CODE:
1057 case EFI_BOOT_SERVICES_DATA:
1058 case EFI_CONVENTIONAL_MEMORY:
1059 e820_type = E820_RAM;
1062 case EFI_ACPI_MEMORY_NVS:
1063 e820_type = E820_NVS;
1070 /* Merge adjacent mappings */
1071 if (prev && prev->type == e820_type &&
1072 (prev->addr + prev->size) == d->phys_addr)
1073 prev->size += d->num_pages << 12;
1075 e820_map->addr = d->phys_addr;
1076 e820_map->size = d->num_pages << 12;
1077 e820_map->type = e820_type;
1083 boot_params->e820_entries = nr_entries;
1088 low_free(_size, (unsigned long)mem_map);
1092 static efi_status_t relocate_kernel(struct setup_header *hdr)
1094 unsigned long start, nr_pages;
1095 efi_status_t status;
1098 * The EFI firmware loader could have placed the kernel image
1099 * anywhere in memory, but the kernel has various restrictions
1100 * on the max physical address it can run at. Attempt to move
1101 * the kernel to boot_params.pref_address, or as low as
1104 start = hdr->pref_address;
1105 nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
1107 status = efi_call_phys4(sys_table->boottime->allocate_pages,
1108 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
1110 if (status != EFI_SUCCESS) {
1111 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
1113 if (status != EFI_SUCCESS)
1114 efi_printk("Failed to alloc mem for kernel\n");
1117 if (status == EFI_SUCCESS)
1118 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1121 hdr->pref_address = hdr->code32_start;
1122 hdr->code32_start = (__u32)start;
1128 * On success we return a pointer to a boot_params structure, and NULL
1131 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1132 struct boot_params *boot_params)
1134 struct desc_ptr *gdt, *idt;
1135 efi_loaded_image_t *image;
1136 struct setup_header *hdr = &boot_params->hdr;
1137 efi_status_t status;
1138 struct desc_struct *desc;
1142 /* Check if we were booted by the EFI firmware */
1143 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1146 setup_graphics(boot_params);
1148 setup_efi_pci(boot_params);
1150 status = efi_call_phys3(sys_table->boottime->allocate_pool,
1151 EFI_LOADER_DATA, sizeof(*gdt),
1153 if (status != EFI_SUCCESS) {
1154 efi_printk("Failed to alloc mem for gdt structure\n");
1159 status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1160 if (status != EFI_SUCCESS) {
1161 efi_printk("Failed to alloc mem for gdt\n");
1165 status = efi_call_phys3(sys_table->boottime->allocate_pool,
1166 EFI_LOADER_DATA, sizeof(*idt),
1168 if (status != EFI_SUCCESS) {
1169 efi_printk("Failed to alloc mem for idt structure\n");
1177 * If the kernel isn't already loaded at the preferred load
1178 * address, relocate it.
1180 if (hdr->pref_address != hdr->code32_start) {
1181 status = relocate_kernel(hdr);
1183 if (status != EFI_SUCCESS)
1187 status = exit_boot(boot_params, handle);
1188 if (status != EFI_SUCCESS)
1191 memset((char *)gdt->address, 0x0, gdt->size);
1192 desc = (struct desc_struct *)gdt->address;
1194 /* The first GDT is a dummy and the second is unused. */
1197 desc->limit0 = 0xffff;
1198 desc->base0 = 0x0000;
1199 desc->base1 = 0x0000;
1200 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1201 desc->s = DESC_TYPE_CODE_DATA;
1207 desc->d = SEG_OP_SIZE_32BIT;
1208 desc->g = SEG_GRANULARITY_4KB;
1212 desc->limit0 = 0xffff;
1213 desc->base0 = 0x0000;
1214 desc->base1 = 0x0000;
1215 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1216 desc->s = DESC_TYPE_CODE_DATA;
1222 desc->d = SEG_OP_SIZE_32BIT;
1223 desc->g = SEG_GRANULARITY_4KB;
1226 #ifdef CONFIG_X86_64
1227 /* Task segment value */
1229 desc->limit0 = 0x0000;
1230 desc->base0 = 0x0000;
1231 desc->base1 = 0x0000;
1232 desc->type = SEG_TYPE_TSS;
1240 desc->g = SEG_GRANULARITY_4KB;
1242 #endif /* CONFIG_X86_64 */
1244 asm volatile ("lidt %0" : : "m" (*idt));
1245 asm volatile ("lgdt %0" : : "m" (*gdt));
1247 asm volatile("cli");