150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/* multiboot_loader.c - boot multiboot kernel image */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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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#include <grub/multiboot.h>
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#include <grub/elf.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/command.h>
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#include <grub/i18n.h>
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grub_dl_t my_mod;
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static int
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find_multi_boot1_header (grub_file_t file)
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{
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struct multiboot_header *header;
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char buffer[MULTIBOOT_SEARCH];
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int found_status = 0;
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grub_ssize_t len;
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len = grub_file_read (file, buffer, MULTIBOOT_SEARCH);
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if (len < 32)
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return found_status;
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/* Look for the multiboot header in the buffer. The header should
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be at least 12 bytes and aligned on a 4-byte boundary. */
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for (header = (struct multiboot_header *) buffer;
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((char *) header <= buffer + len - 12) || (header = 0);
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header = (struct multiboot_header *) ((char *) header + 4))
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{
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if (header->magic == MULTIBOOT_HEADER_MAGIC
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&& !(header->magic + header->flags + header->checksum))
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{
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found_status = 1;
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break;
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}
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}
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return found_status;
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}
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static grub_err_t
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grub_cmd_multiboot_loader (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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int header_multi_ver_found = 0;
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grub_dl_ref (my_mod);
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if (argc == 0)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "no kernel specified");
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goto fail;
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}
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file = grub_gzfile_open (argv[0], 1);
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if (! file)
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{
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grub_error (GRUB_ERR_BAD_ARGUMENT, "couldn't open file");
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goto fail;
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}
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/* find which header is in the file */
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if (find_multi_boot1_header (file))
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header_multi_ver_found = 1;
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else
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{
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grub_error (GRUB_ERR_BAD_OS, "multiboot header not found");
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goto fail;
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}
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/* close file before calling functions */
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if (file)
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grub_file_close (file);
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/* Launch multi boot with header */
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grub_dprintf ("multiboot_loader",
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"Launching multiboot 1 grub_multiboot() function\n");
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grub_multiboot (argc, argv);
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return grub_errno;
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fail:
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if (file)
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grub_file_close (file);
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grub_dl_unref (my_mod);
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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_loader (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_dprintf("multiboot_loader",
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"Launching multiboot 1 grub_module() function\n");
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grub_module (argc, argv);
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return grub_errno;
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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_loader,
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0, N_("Load a multiboot 2 kernel."));
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#else
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grub_register_command ("multiboot", grub_cmd_multiboot_loader,
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0, N_("Load a multiboot kernel."));
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#endif
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cmd_module =
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grub_register_command ("module", grub_cmd_module_loader,
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0, N_("Load a multiboot module."));
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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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