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>
12 #include <asm/setup.h>
15 #undef memcpy /* Use memcpy from misc.c */
19 static efi_system_table_t *sys_table;
21 static void efi_printk(char *str)
25 for (s8 = str; *s8; s8++) {
26 struct efi_simple_text_output_protocol *out;
27 efi_char16_t ch[2] = { 0 };
30 out = (struct efi_simple_text_output_protocol *)sys_table->con_out;
33 efi_char16_t nl[2] = { '\r', 0 };
34 efi_call_phys2(out->output_string, out, nl);
37 efi_call_phys2(out->output_string, out, ch);
41 static efi_status_t __get_map(efi_memory_desc_t **map, unsigned long *map_size,
42 unsigned long *desc_size)
44 efi_memory_desc_t *m = NULL;
49 *map_size = sizeof(*m) * 32;
52 * Add an additional efi_memory_desc_t because we're doing an
53 * allocation which may be in a new descriptor region.
55 *map_size += sizeof(*m);
56 status = efi_call_phys3(sys_table->boottime->allocate_pool,
57 EFI_LOADER_DATA, *map_size, (void **)&m);
58 if (status != EFI_SUCCESS)
61 status = efi_call_phys5(sys_table->boottime->get_memory_map, map_size,
62 m, &key, desc_size, &desc_version);
63 if (status == EFI_BUFFER_TOO_SMALL) {
64 efi_call_phys1(sys_table->boottime->free_pool, m);
68 if (status != EFI_SUCCESS)
69 efi_call_phys1(sys_table->boottime->free_pool, m);
77 * Allocate at the highest possible address that is not above 'max'.
79 static efi_status_t high_alloc(unsigned long size, unsigned long align,
80 unsigned long *addr, unsigned long max)
82 unsigned long map_size, desc_size;
83 efi_memory_desc_t *map;
85 unsigned long nr_pages;
89 status = __get_map(&map, &map_size, &desc_size);
90 if (status != EFI_SUCCESS)
93 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
95 for (i = 0; i < map_size / desc_size; i++) {
96 efi_memory_desc_t *desc;
97 unsigned long m = (unsigned long)map;
100 desc = (efi_memory_desc_t *)(m + (i * desc_size));
101 if (desc->type != EFI_CONVENTIONAL_MEMORY)
104 if (desc->num_pages < nr_pages)
107 start = desc->phys_addr;
108 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
110 if ((start + size) > end || (start + size) > max)
113 if (end - size > max)
116 if (round_down(end - size, align) < start)
119 start = round_down(end - size, align);
122 * Don't allocate at 0x0. It will confuse code that
123 * checks pointers against NULL.
128 if (start > max_addr)
133 status = EFI_NOT_FOUND;
135 status = efi_call_phys4(sys_table->boottime->allocate_pages,
136 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
137 nr_pages, &max_addr);
138 if (status != EFI_SUCCESS) {
148 efi_call_phys1(sys_table->boottime->free_pool, map);
155 * Allocate at the lowest possible address.
157 static efi_status_t low_alloc(unsigned long size, unsigned long align,
160 unsigned long map_size, desc_size;
161 efi_memory_desc_t *map;
163 unsigned long nr_pages;
166 status = __get_map(&map, &map_size, &desc_size);
167 if (status != EFI_SUCCESS)
170 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
171 for (i = 0; i < map_size / desc_size; i++) {
172 efi_memory_desc_t *desc;
173 unsigned long m = (unsigned long)map;
176 desc = (efi_memory_desc_t *)(m + (i * desc_size));
178 if (desc->type != EFI_CONVENTIONAL_MEMORY)
181 if (desc->num_pages < nr_pages)
184 start = desc->phys_addr;
185 end = start + desc->num_pages * (1UL << EFI_PAGE_SHIFT);
188 * Don't allocate at 0x0. It will confuse code that
189 * checks pointers against NULL. Skip the first 8
190 * bytes so we start at a nice even number.
195 start = round_up(start, align);
196 if ((start + size) > end)
199 status = efi_call_phys4(sys_table->boottime->allocate_pages,
200 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
202 if (status == EFI_SUCCESS) {
208 if (i == map_size / desc_size)
209 status = EFI_NOT_FOUND;
212 efi_call_phys1(sys_table->boottime->free_pool, map);
217 static void low_free(unsigned long size, unsigned long addr)
219 unsigned long nr_pages;
221 nr_pages = round_up(size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
222 efi_call_phys2(sys_table->boottime->free_pages, addr, size);
225 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
233 while (!(mask & 0x1)) {
249 * See if we have Graphics Output Protocol
251 static efi_status_t setup_gop(struct screen_info *si, efi_guid_t *proto,
254 struct efi_graphics_output_protocol *gop, *first_gop;
255 struct efi_pixel_bitmask pixel_info;
256 unsigned long nr_gops;
260 u32 fb_base, fb_size;
261 u32 pixels_per_scan_line;
265 status = efi_call_phys3(sys_table->boottime->allocate_pool,
266 EFI_LOADER_DATA, size, &gop_handle);
267 if (status != EFI_SUCCESS)
270 status = efi_call_phys5(sys_table->boottime->locate_handle,
271 EFI_LOCATE_BY_PROTOCOL, proto,
272 NULL, &size, gop_handle);
273 if (status != EFI_SUCCESS)
278 nr_gops = size / sizeof(void *);
279 for (i = 0; i < nr_gops; i++) {
280 struct efi_graphics_output_mode_info *info;
281 efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
282 bool conout_found = false;
284 void *h = gop_handle[i];
286 status = efi_call_phys3(sys_table->boottime->handle_protocol,
288 if (status != EFI_SUCCESS)
291 status = efi_call_phys3(sys_table->boottime->handle_protocol,
292 h, &conout_proto, &dummy);
294 if (status == EFI_SUCCESS)
297 status = efi_call_phys4(gop->query_mode, gop,
298 gop->mode->mode, &size, &info);
299 if (status == EFI_SUCCESS && (!first_gop || conout_found)) {
301 * Systems that use the UEFI Console Splitter may
302 * provide multiple GOP devices, not all of which are
303 * backed by real hardware. The workaround is to search
304 * for a GOP implementing the ConOut protocol, and if
305 * one isn't found, to just fall back to the first GOP.
307 width = info->horizontal_resolution;
308 height = info->vertical_resolution;
309 fb_base = gop->mode->frame_buffer_base;
310 fb_size = gop->mode->frame_buffer_size;
311 pixel_format = info->pixel_format;
312 pixel_info = info->pixel_information;
313 pixels_per_scan_line = info->pixels_per_scan_line;
316 * Once we've found a GOP supporting ConOut,
317 * don't bother looking any further.
326 /* Did we find any GOPs? */
330 /* EFI framebuffer */
331 si->orig_video_isVGA = VIDEO_TYPE_EFI;
333 si->lfb_width = width;
334 si->lfb_height = height;
335 si->lfb_base = fb_base;
338 if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
340 si->lfb_linelength = pixels_per_scan_line * 4;
349 } else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
351 si->lfb_linelength = pixels_per_scan_line * 4;
360 } else if (pixel_format == PIXEL_BIT_MASK) {
361 find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
362 find_bits(pixel_info.green_mask, &si->green_pos,
364 find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
365 find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
367 si->lfb_depth = si->red_size + si->green_size +
368 si->blue_size + si->rsvd_size;
369 si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
372 si->lfb_linelength = si->lfb_width / 2;
383 si->lfb_size = si->lfb_linelength * si->lfb_height;
385 si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
388 efi_call_phys1(sys_table->boottime->free_pool, gop_handle);
393 * See if we have Universal Graphics Adapter (UGA) protocol
395 static efi_status_t setup_uga(struct screen_info *si, efi_guid_t *uga_proto,
398 struct efi_uga_draw_protocol *uga, *first_uga;
399 unsigned long nr_ugas;
402 void **uga_handle = NULL;
405 status = efi_call_phys3(sys_table->boottime->allocate_pool,
406 EFI_LOADER_DATA, size, &uga_handle);
407 if (status != EFI_SUCCESS)
410 status = efi_call_phys5(sys_table->boottime->locate_handle,
411 EFI_LOCATE_BY_PROTOCOL, uga_proto,
412 NULL, &size, uga_handle);
413 if (status != EFI_SUCCESS)
418 nr_ugas = size / sizeof(void *);
419 for (i = 0; i < nr_ugas; i++) {
420 efi_guid_t pciio_proto = EFI_PCI_IO_PROTOCOL_GUID;
421 void *handle = uga_handle[i];
422 u32 w, h, depth, refresh;
425 status = efi_call_phys3(sys_table->boottime->handle_protocol,
426 handle, uga_proto, &uga);
427 if (status != EFI_SUCCESS)
430 efi_call_phys3(sys_table->boottime->handle_protocol,
431 handle, &pciio_proto, &pciio);
433 status = efi_call_phys5(uga->get_mode, uga, &w, &h,
435 if (status == EFI_SUCCESS && (!first_uga || pciio)) {
440 * Once we've found a UGA supporting PCIIO,
441 * don't bother looking any further.
453 /* EFI framebuffer */
454 si->orig_video_isVGA = VIDEO_TYPE_EFI;
457 si->lfb_width = width;
458 si->lfb_height = height;
471 efi_call_phys1(sys_table->boottime->free_pool, uga_handle);
475 void setup_graphics(struct boot_params *boot_params)
477 efi_guid_t graphics_proto = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
478 struct screen_info *si;
479 efi_guid_t uga_proto = EFI_UGA_PROTOCOL_GUID;
482 void **gop_handle = NULL;
483 void **uga_handle = NULL;
485 si = &boot_params->screen_info;
486 memset(si, 0, sizeof(*si));
489 status = efi_call_phys5(sys_table->boottime->locate_handle,
490 EFI_LOCATE_BY_PROTOCOL, &graphics_proto,
491 NULL, &size, gop_handle);
492 if (status == EFI_BUFFER_TOO_SMALL)
493 status = setup_gop(si, &graphics_proto, size);
495 if (status != EFI_SUCCESS) {
497 status = efi_call_phys5(sys_table->boottime->locate_handle,
498 EFI_LOCATE_BY_PROTOCOL, &uga_proto,
499 NULL, &size, uga_handle);
500 if (status == EFI_BUFFER_TOO_SMALL)
501 setup_uga(si, &uga_proto, size);
506 efi_file_handle_t *handle;
511 * Check the cmdline for a LILO-style initrd= arguments.
513 * We only support loading an initrd from the same filesystem as the
516 static efi_status_t handle_ramdisks(efi_loaded_image_t *image,
517 struct setup_header *hdr)
519 struct initrd *initrds;
520 unsigned long initrd_addr;
521 efi_guid_t fs_proto = EFI_FILE_SYSTEM_GUID;
523 efi_file_io_interface_t *io;
524 efi_file_handle_t *fh;
533 str = (char *)(unsigned long)hdr->cmd_line_ptr;
535 j = 0; /* See close_handles */
540 for (nr_initrds = 0; *str; nr_initrds++) {
541 str = strstr(str, "initrd=");
547 /* Skip any leading slashes */
548 while (*str == '/' || *str == '\\')
551 while (*str && *str != ' ' && *str != '\n')
558 status = efi_call_phys3(sys_table->boottime->allocate_pool,
560 nr_initrds * sizeof(*initrds),
562 if (status != EFI_SUCCESS) {
563 efi_printk("Failed to alloc mem for initrds\n");
567 str = (char *)(unsigned long)hdr->cmd_line_ptr;
568 for (i = 0; i < nr_initrds; i++) {
569 struct initrd *initrd;
570 efi_file_handle_t *h;
571 efi_file_info_t *info;
572 efi_char16_t filename_16[256];
573 unsigned long info_sz;
574 efi_guid_t info_guid = EFI_FILE_INFO_ID;
578 str = strstr(str, "initrd=");
584 initrd = &initrds[i];
587 /* Skip any leading slashes */
588 while (*str == '/' || *str == '\\')
591 while (*str && *str != ' ' && *str != '\n') {
592 if ((u8 *)p >= (u8 *)filename_16 + sizeof(filename_16))
600 /* Only open the volume once. */
602 efi_boot_services_t *boottime;
604 boottime = sys_table->boottime;
606 status = efi_call_phys3(boottime->handle_protocol,
607 image->device_handle, &fs_proto, &io);
608 if (status != EFI_SUCCESS) {
609 efi_printk("Failed to handle fs_proto\n");
613 status = efi_call_phys2(io->open_volume, io, &fh);
614 if (status != EFI_SUCCESS) {
615 efi_printk("Failed to open volume\n");
620 status = efi_call_phys5(fh->open, fh, &h, filename_16,
621 EFI_FILE_MODE_READ, (u64)0);
622 if (status != EFI_SUCCESS) {
623 efi_printk("Failed to open initrd file\n");
630 status = efi_call_phys4(h->get_info, h, &info_guid,
632 if (status != EFI_BUFFER_TOO_SMALL) {
633 efi_printk("Failed to get initrd info size\n");
638 status = efi_call_phys3(sys_table->boottime->allocate_pool,
639 EFI_LOADER_DATA, info_sz, &info);
640 if (status != EFI_SUCCESS) {
641 efi_printk("Failed to alloc mem for initrd info\n");
645 status = efi_call_phys4(h->get_info, h, &info_guid,
647 if (status == EFI_BUFFER_TOO_SMALL) {
648 efi_call_phys1(sys_table->boottime->free_pool, info);
652 file_sz = info->file_size;
653 efi_call_phys1(sys_table->boottime->free_pool, info);
655 if (status != EFI_SUCCESS) {
656 efi_printk("Failed to get initrd info\n");
660 initrd->size = file_sz;
661 initrd_total += file_sz;
668 * Multiple initrd's need to be at consecutive
669 * addresses in memory, so allocate enough memory for
672 status = high_alloc(initrd_total, 0x1000,
673 &initrd_addr, hdr->initrd_addr_max);
674 if (status != EFI_SUCCESS) {
675 efi_printk("Failed to alloc highmem for initrds\n");
679 /* We've run out of free low memory. */
680 if (initrd_addr > hdr->initrd_addr_max) {
681 efi_printk("We've run out of free low memory\n");
682 status = EFI_INVALID_PARAMETER;
683 goto free_initrd_total;
687 for (j = 0; j < nr_initrds; j++) {
690 size = initrds[j].size;
693 if (size > EFI_READ_CHUNK_SIZE)
694 chunksize = EFI_READ_CHUNK_SIZE;
697 status = efi_call_phys3(fh->read,
700 if (status != EFI_SUCCESS) {
701 efi_printk("Failed to read initrd\n");
702 goto free_initrd_total;
708 efi_call_phys1(fh->close, initrds[j].handle);
713 efi_call_phys1(sys_table->boottime->free_pool, initrds);
715 hdr->ramdisk_image = initrd_addr;
716 hdr->ramdisk_size = initrd_total;
721 low_free(initrd_total, initrd_addr);
724 for (k = j; k < i; k++)
725 efi_call_phys1(fh->close, initrds[k].handle);
727 efi_call_phys1(sys_table->boottime->free_pool, initrds);
729 hdr->ramdisk_image = 0;
730 hdr->ramdisk_size = 0;
736 * Because the x86 boot code expects to be passed a boot_params we
737 * need to create one ourselves (usually the bootloader would create
740 struct boot_params *make_boot_params(void *handle, efi_system_table_t *_table)
742 struct boot_params *boot_params;
743 struct sys_desc_table *sdt;
744 struct apm_bios_info *bi;
745 struct setup_header *hdr;
746 struct efi_info *efi;
747 efi_loaded_image_t *image;
749 u32 load_options_size;
750 efi_guid_t proto = LOADED_IMAGE_PROTOCOL_GUID;
751 int options_size = 0;
753 unsigned long cmdline;
760 /* Check if we were booted by the EFI firmware */
761 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
764 status = efi_call_phys3(sys_table->boottime->handle_protocol,
765 handle, &proto, (void *)&image);
766 if (status != EFI_SUCCESS) {
767 efi_printk("Failed to get handle for LOADED_IMAGE_PROTOCOL\n");
771 status = low_alloc(0x4000, 1, (unsigned long *)&boot_params);
772 if (status != EFI_SUCCESS) {
773 efi_printk("Failed to alloc lowmem for boot params\n");
777 memset(boot_params, 0x0, 0x4000);
779 hdr = &boot_params->hdr;
780 efi = &boot_params->efi_info;
781 bi = &boot_params->apm_bios_info;
782 sdt = &boot_params->sys_desc_table;
784 /* Copy the second sector to boot_params */
785 memcpy(&hdr->jump, image->image_base + 512, 512);
788 * Fill out some of the header fields ourselves because the
789 * EFI firmware loader doesn't load the first sector.
792 hdr->vid_mode = 0xffff;
793 hdr->boot_flag = 0xAA55;
795 hdr->code32_start = (__u64)(unsigned long)image->image_base;
797 hdr->type_of_loader = 0x21;
799 /* Convert unicode cmdline to ascii */
800 options = image->load_options;
801 load_options_size = image->load_options_size / 2; /* ASCII */
806 while (*s2 && *s2 != '\n' && options_size < load_options_size) {
812 if (options_size > hdr->cmdline_size)
813 options_size = hdr->cmdline_size;
815 options_size++; /* NUL termination */
817 status = low_alloc(options_size, 1, &cmdline);
818 if (status != EFI_SUCCESS) {
819 efi_printk("Failed to alloc mem for cmdline\n");
823 s1 = (u8 *)(unsigned long)cmdline;
826 for (i = 0; i < options_size - 1; i++)
833 hdr->cmd_line_ptr = cmdline;
835 hdr->ramdisk_image = 0;
836 hdr->ramdisk_size = 0;
838 /* Clear APM BIOS info */
839 memset(bi, 0, sizeof(*bi));
841 memset(sdt, 0, sizeof(*sdt));
843 status = handle_ramdisks(image, hdr);
844 if (status != EFI_SUCCESS)
850 low_free(options_size, hdr->cmd_line_ptr);
852 low_free(0x4000, (unsigned long)boot_params);
856 static efi_status_t exit_boot(struct boot_params *boot_params,
859 struct efi_info *efi = &boot_params->efi_info;
860 struct e820entry *e820_map = &boot_params->e820_map[0];
861 struct e820entry *prev = NULL;
862 unsigned long size, key, desc_size, _size;
863 efi_memory_desc_t *mem_map;
869 size = sizeof(*mem_map) * 32;
872 size += sizeof(*mem_map);
874 status = low_alloc(size, 1, (unsigned long *)&mem_map);
875 if (status != EFI_SUCCESS)
878 status = efi_call_phys5(sys_table->boottime->get_memory_map, &size,
879 mem_map, &key, &desc_size, &desc_version);
880 if (status == EFI_BUFFER_TOO_SMALL) {
881 low_free(_size, (unsigned long)mem_map);
885 if (status != EFI_SUCCESS)
888 memcpy(&efi->efi_loader_signature, EFI_LOADER_SIGNATURE, sizeof(__u32));
889 efi->efi_systab = (unsigned long)sys_table;
890 efi->efi_memdesc_size = desc_size;
891 efi->efi_memdesc_version = desc_version;
892 efi->efi_memmap = (unsigned long)mem_map;
893 efi->efi_memmap_size = size;
896 efi->efi_systab_hi = (unsigned long)sys_table >> 32;
897 efi->efi_memmap_hi = (unsigned long)mem_map >> 32;
900 /* Might as well exit boot services now */
901 status = efi_call_phys2(sys_table->boottime->exit_boot_services,
903 if (status != EFI_SUCCESS)
907 boot_params->alt_mem_k = 32 * 1024;
910 * Convert the EFI memory map to E820.
913 for (i = 0; i < size / desc_size; i++) {
914 efi_memory_desc_t *d;
915 unsigned int e820_type = 0;
916 unsigned long m = (unsigned long)mem_map;
918 d = (efi_memory_desc_t *)(m + (i * desc_size));
920 case EFI_RESERVED_TYPE:
921 case EFI_RUNTIME_SERVICES_CODE:
922 case EFI_RUNTIME_SERVICES_DATA:
923 case EFI_MEMORY_MAPPED_IO:
924 case EFI_MEMORY_MAPPED_IO_PORT_SPACE:
926 e820_type = E820_RESERVED;
929 case EFI_UNUSABLE_MEMORY:
930 e820_type = E820_UNUSABLE;
933 case EFI_ACPI_RECLAIM_MEMORY:
934 e820_type = E820_ACPI;
937 case EFI_LOADER_CODE:
938 case EFI_LOADER_DATA:
939 case EFI_BOOT_SERVICES_CODE:
940 case EFI_BOOT_SERVICES_DATA:
941 case EFI_CONVENTIONAL_MEMORY:
942 e820_type = E820_RAM;
945 case EFI_ACPI_MEMORY_NVS:
946 e820_type = E820_NVS;
953 /* Merge adjacent mappings */
954 if (prev && prev->type == e820_type &&
955 (prev->addr + prev->size) == d->phys_addr)
956 prev->size += d->num_pages << 12;
958 e820_map->addr = d->phys_addr;
959 e820_map->size = d->num_pages << 12;
960 e820_map->type = e820_type;
966 boot_params->e820_entries = nr_entries;
971 low_free(_size, (unsigned long)mem_map);
975 static efi_status_t relocate_kernel(struct setup_header *hdr)
977 unsigned long start, nr_pages;
981 * The EFI firmware loader could have placed the kernel image
982 * anywhere in memory, but the kernel has various restrictions
983 * on the max physical address it can run at. Attempt to move
984 * the kernel to boot_params.pref_address, or as low as
987 start = hdr->pref_address;
988 nr_pages = round_up(hdr->init_size, EFI_PAGE_SIZE) / EFI_PAGE_SIZE;
990 status = efi_call_phys4(sys_table->boottime->allocate_pages,
991 EFI_ALLOCATE_ADDRESS, EFI_LOADER_DATA,
993 if (status != EFI_SUCCESS) {
994 status = low_alloc(hdr->init_size, hdr->kernel_alignment,
996 if (status != EFI_SUCCESS)
997 efi_printk("Failed to alloc mem for kernel\n");
1000 if (status == EFI_SUCCESS)
1001 memcpy((void *)start, (void *)(unsigned long)hdr->code32_start,
1004 hdr->pref_address = hdr->code32_start;
1005 hdr->code32_start = (__u32)start;
1011 * On success we return a pointer to a boot_params structure, and NULL
1014 struct boot_params *efi_main(void *handle, efi_system_table_t *_table,
1015 struct boot_params *boot_params)
1017 struct desc_ptr *gdt, *idt;
1018 efi_loaded_image_t *image;
1019 struct setup_header *hdr = &boot_params->hdr;
1020 efi_status_t status;
1021 struct desc_struct *desc;
1025 /* Check if we were booted by the EFI firmware */
1026 if (sys_table->hdr.signature != EFI_SYSTEM_TABLE_SIGNATURE)
1029 setup_graphics(boot_params);
1031 status = efi_call_phys3(sys_table->boottime->allocate_pool,
1032 EFI_LOADER_DATA, sizeof(*gdt),
1034 if (status != EFI_SUCCESS) {
1035 efi_printk("Failed to alloc mem for gdt structure\n");
1040 status = low_alloc(gdt->size, 8, (unsigned long *)&gdt->address);
1041 if (status != EFI_SUCCESS) {
1042 efi_printk("Failed to alloc mem for gdt\n");
1046 status = efi_call_phys3(sys_table->boottime->allocate_pool,
1047 EFI_LOADER_DATA, sizeof(*idt),
1049 if (status != EFI_SUCCESS) {
1050 efi_printk("Failed to alloc mem for idt structure\n");
1058 * If the kernel isn't already loaded at the preferred load
1059 * address, relocate it.
1061 if (hdr->pref_address != hdr->code32_start) {
1062 status = relocate_kernel(hdr);
1064 if (status != EFI_SUCCESS)
1068 status = exit_boot(boot_params, handle);
1069 if (status != EFI_SUCCESS)
1072 memset((char *)gdt->address, 0x0, gdt->size);
1073 desc = (struct desc_struct *)gdt->address;
1075 /* The first GDT is a dummy and the second is unused. */
1078 desc->limit0 = 0xffff;
1079 desc->base0 = 0x0000;
1080 desc->base1 = 0x0000;
1081 desc->type = SEG_TYPE_CODE | SEG_TYPE_EXEC_READ;
1082 desc->s = DESC_TYPE_CODE_DATA;
1088 desc->d = SEG_OP_SIZE_32BIT;
1089 desc->g = SEG_GRANULARITY_4KB;
1093 desc->limit0 = 0xffff;
1094 desc->base0 = 0x0000;
1095 desc->base1 = 0x0000;
1096 desc->type = SEG_TYPE_DATA | SEG_TYPE_READ_WRITE;
1097 desc->s = DESC_TYPE_CODE_DATA;
1103 desc->d = SEG_OP_SIZE_32BIT;
1104 desc->g = SEG_GRANULARITY_4KB;
1107 #ifdef CONFIG_X86_64
1108 /* Task segment value */
1110 desc->limit0 = 0x0000;
1111 desc->base0 = 0x0000;
1112 desc->base1 = 0x0000;
1113 desc->type = SEG_TYPE_TSS;
1121 desc->g = SEG_GRANULARITY_4KB;
1123 #endif /* CONFIG_X86_64 */
1125 asm volatile ("lidt %0" : : "m" (*idt));
1126 asm volatile ("lgdt %0" : : "m" (*gdt));
1128 asm volatile("cli");