362 lines
9 KiB
C
362 lines
9 KiB
C
/* multiboot.c - boot a multiboot OS image. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2007,2008,2009,2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* FIXME: The following features from the Multiboot specification still
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* need to be implemented:
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* - VBE support
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* - symbol table
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* - drives table
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* - ROM configuration table
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* - APM table
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*/
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#include <grub/loader.h>
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#include <grub/command.h>
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#include <grub/machine/loader.h>
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#include <grub/multiboot.h>
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#include <grub/cpu/multiboot.h>
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#include <grub/elf.h>
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#include <grub/aout.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/dl.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/gzio.h>
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#include <grub/env.h>
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#include <grub/cpu/relocator.h>
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#include <grub/video.h>
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#include <grub/memory.h>
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#include <grub/i18n.h>
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#ifdef GRUB_MACHINE_EFI
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#include <grub/efi/efi.h>
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#endif
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#if defined (GRUB_MACHINE_PCBIOS) || defined (GRUB_MACHINE_MULTIBOOT) || defined (GRUB_MACHINE_COREBOOT) || defined (GRUB_MACHINE_QEMU)
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#define DEFAULT_VIDEO_MODE "text"
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#else
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#define DEFAULT_VIDEO_MODE "auto"
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#endif
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grub_size_t grub_multiboot_alloc_mbi;
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char *grub_multiboot_payload_orig;
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grub_addr_t grub_multiboot_payload_dest;
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grub_size_t grub_multiboot_pure_size;
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grub_uint32_t grub_multiboot_payload_eip;
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static int accepts_video;
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static int accepts_ega_text;
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static int console_required;
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static grub_dl_t my_mod;
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/* Return the length of the Multiboot mmap that will be needed to allocate
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our platform's map. */
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grub_uint32_t
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grub_get_multiboot_mmap_count (void)
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{
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grub_size_t count = 0;
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auto int NESTED_FUNC_ATTR hook (grub_uint64_t, grub_uint64_t, grub_uint32_t);
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int NESTED_FUNC_ATTR hook (grub_uint64_t addr __attribute__ ((unused)),
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grub_uint64_t size __attribute__ ((unused)),
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grub_uint32_t type __attribute__ ((unused)))
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{
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count++;
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return 0;
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}
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grub_mmap_iterate (hook);
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return count;
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}
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grub_err_t
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grub_multiboot_set_video_mode (void)
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{
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grub_err_t err;
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const char *modevar;
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if (accepts_video || !GRUB_MACHINE_HAS_VGA_TEXT)
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{
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modevar = grub_env_get ("gfxpayload");
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if (! modevar || *modevar == 0)
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err = grub_video_set_mode (DEFAULT_VIDEO_MODE, 0, 0);
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else
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{
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char *tmp;
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tmp = grub_xasprintf ("%s;" DEFAULT_VIDEO_MODE, modevar);
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if (! tmp)
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return grub_errno;
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err = grub_video_set_mode (tmp, 0, 0);
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grub_free (tmp);
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}
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}
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else
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err = grub_video_set_mode ("text", 0, 0);
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return err;
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}
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static grub_err_t
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grub_multiboot_boot (void)
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{
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grub_size_t mbi_size;
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grub_err_t err;
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struct grub_relocator32_state state = MULTIBOOT_INITIAL_STATE;
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state.MULTIBOOT_ENTRY_REGISTER = grub_multiboot_payload_eip;
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mbi_size = grub_multiboot_get_mbi_size ();
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if (grub_multiboot_alloc_mbi < mbi_size)
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{
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grub_multiboot_payload_orig
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= grub_relocator32_realloc (grub_multiboot_payload_orig,
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grub_multiboot_pure_size + mbi_size);
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if (!grub_multiboot_payload_orig)
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return grub_errno;
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grub_multiboot_alloc_mbi = mbi_size;
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}
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#ifdef GRUB_USE_MULTIBOOT2
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state.MULTIBOOT_MBI_REGISTER = ALIGN_UP (grub_multiboot_payload_dest
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+ grub_multiboot_pure_size,
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MULTIBOOT_TAG_ALIGN);
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#else
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state.MULTIBOOT_MBI_REGISTER = grub_multiboot_payload_dest
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+ grub_multiboot_pure_size;
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#endif
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err = grub_multiboot_make_mbi (grub_multiboot_payload_orig,
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grub_multiboot_payload_dest,
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grub_multiboot_pure_size, mbi_size);
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if (err)
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return err;
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#ifdef GRUB_MACHINE_EFI
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if (! grub_efi_finish_boot_services ())
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grub_fatal ("cannot exit boot services");
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#endif
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grub_relocator32_boot (grub_multiboot_payload_orig,
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grub_multiboot_payload_dest,
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state);
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/* Not reached. */
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_multiboot_unload (void)
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{
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grub_multiboot_free_mbi ();
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grub_relocator32_free (grub_multiboot_payload_orig);
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grub_multiboot_alloc_mbi = 0;
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grub_multiboot_payload_orig = NULL;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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#define MULTIBOOT_LOAD_ELF64
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#include "multiboot_elfxx.c"
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#undef MULTIBOOT_LOAD_ELF64
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#define MULTIBOOT_LOAD_ELF32
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#include "multiboot_elfxx.c"
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#undef MULTIBOOT_LOAD_ELF32
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/* Load ELF32 or ELF64. */
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grub_err_t
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grub_multiboot_load_elf (grub_file_t file, void *buffer)
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{
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if (grub_multiboot_is_elf32 (buffer))
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return grub_multiboot_load_elf32 (file, buffer);
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else if (grub_multiboot_is_elf64 (buffer))
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return grub_multiboot_load_elf64 (file, buffer);
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return grub_error (GRUB_ERR_UNKNOWN_OS, "unknown ELF class");
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}
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grub_err_t
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grub_multiboot_set_console (int console_type, int accepted_consoles,
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int width, int height, int depth,
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int console_req)
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{
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console_required = console_req;
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if (!(accepted_consoles
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& (GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER
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| (GRUB_MACHINE_HAS_VGA_TEXT ? GRUB_MULTIBOOT_CONSOLE_EGA_TEXT : 0))))
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{
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if (console_required)
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return grub_error (GRUB_ERR_BAD_OS,
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"OS requires a console but none is available");
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grub_printf ("WARNING: no console will be available to OS");
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accepts_video = 0;
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accepts_ega_text = 0;
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return GRUB_ERR_NONE;
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}
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if (console_type == GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER)
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{
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char *buf;
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if (depth && width && height)
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buf = grub_xasprintf ("%dx%dx%d,%dx%d,auto", width,
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height, depth, width, height);
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else if (width && height)
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buf = grub_xasprintf ("%dx%d,auto", width, height);
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else
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buf = grub_strdup ("auto");
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if (!buf)
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return grub_errno;
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grub_env_set ("gfxpayload", buf);
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grub_free (buf);
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}
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else
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grub_env_set ("gfxpayload", "text");
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accepts_video = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_FRAMEBUFFER);
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accepts_ega_text = !!(accepted_consoles & GRUB_MULTIBOOT_CONSOLE_EGA_TEXT);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_multiboot (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_err_t err;
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grub_loader_unset ();
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
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file = grub_gzfile_open (argv[0], 1);
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if (! file)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file");
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grub_dl_ref (my_mod);
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/* Skip filename. */
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grub_multiboot_init_mbi (argc - 1, argv + 1);
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grub_relocator32_free (grub_multiboot_payload_orig);
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grub_multiboot_payload_orig = NULL;
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err = grub_multiboot_load (file);
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if (err)
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goto fail;
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grub_multiboot_set_bootdev ();
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grub_loader_set (grub_multiboot_boot, grub_multiboot_unload, 0);
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fail:
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if (file)
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grub_file_close (file);
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if (grub_errno != GRUB_ERR_NONE)
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{
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grub_relocator32_free (grub_multiboot_payload_orig);
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grub_multiboot_free_mbi ();
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grub_dl_unref (my_mod);
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}
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return grub_errno;
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}
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static grub_err_t
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grub_cmd_module (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_ssize_t size;
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char *module = 0;
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grub_err_t err;
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no module specified");
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if (!grub_multiboot_payload_orig)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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"you need to load the multiboot kernel first");
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file = grub_gzfile_open (argv[0], 1);
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if (! file)
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return grub_errno;
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size = grub_file_size (file);
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module = grub_memalign (MULTIBOOT_MOD_ALIGN, size);
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if (! module)
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{
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grub_file_close (file);
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return grub_errno;
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}
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err = grub_multiboot_add_module ((grub_addr_t) module, size,
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argc - 1, argv + 1);
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if (err)
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{
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grub_file_close (file);
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return err;
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}
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if (grub_file_read (file, module, size) != size)
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{
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grub_file_close (file);
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return grub_error (GRUB_ERR_FILE_READ_ERROR, "couldn't read file");
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}
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grub_file_close (file);
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return GRUB_ERR_NONE;;
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}
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static grub_command_t cmd_multiboot, cmd_module;
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GRUB_MOD_INIT(multiboot)
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{
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cmd_multiboot =
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#ifdef GRUB_USE_MULTIBOOT2
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grub_register_command ("multiboot2", grub_cmd_multiboot,
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0, N_("Load a multiboot 2 kernel."));
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cmd_module =
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grub_register_command ("module2", grub_cmd_module,
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0, N_("Load a multiboot 2 module."));
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#else
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grub_register_command ("multiboot", grub_cmd_multiboot,
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0, N_("Load a multiboot kernel."));
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cmd_module =
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grub_register_command ("module", grub_cmd_module,
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0, N_("Load a multiboot module."));
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#endif
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my_mod = mod;
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}
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GRUB_MOD_FINI(multiboot)
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{
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grub_unregister_command (cmd_multiboot);
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grub_unregister_command (cmd_module);
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}
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