152 lines
4 KiB
C
152 lines
4 KiB
C
/* main.c - the kernel main routine */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2005,2006,2008 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/kernel.h>
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#include <grub/misc.h>
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#include <grub/symbol.h>
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#include <grub/dl.h>
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#include <grub/term.h>
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#include <grub/rescue.h>
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#include <grub/file.h>
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#include <grub/device.h>
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#include <grub/env.h>
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#include <grub/mm.h>
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void
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grub_module_iterate (int (*hook) (struct grub_module_header *header))
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{
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struct grub_module_info *modinfo;
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struct grub_module_header *header;
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grub_addr_t modbase;
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modbase = grub_arch_modules_addr ();
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modinfo = (struct grub_module_info *) modbase;
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/* Check if there are any modules. */
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if ((modinfo == 0) || modinfo->magic != GRUB_MODULE_MAGIC)
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return;
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for (header = (struct grub_module_header *) (modbase + modinfo->offset);
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header < (struct grub_module_header *) (modbase + modinfo->size);
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header = (struct grub_module_header *) ((char *) header + header->size))
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{
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if (hook (header))
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break;
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}
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}
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/* Load all modules in core. */
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static void
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grub_load_modules (void)
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{
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auto int hook (struct grub_module_header *);
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int hook (struct grub_module_header *header)
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{
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/* Not an ELF module, skip. */
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if (header->type != OBJ_TYPE_ELF)
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return 0;
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if (! grub_dl_load_core ((char *) header + sizeof (struct grub_module_header),
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(header->size - sizeof (struct grub_module_header))))
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grub_fatal ("%s", grub_errmsg);
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return 0;
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}
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grub_module_iterate (hook);
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}
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/* Write hook for the environment variables of root. Remove surrounding
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parentheses, if any. */
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static char *
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grub_env_write_root (struct grub_env_var *var __attribute__ ((unused)),
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const char *val)
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{
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/* XXX Is it better to check the existence of the device? */
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grub_size_t len = grub_strlen (val);
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if (val[0] == '(' && val[len - 1] == ')')
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return grub_strndup (val + 1, len - 2);
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return grub_strdup (val);
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}
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/* Set the root device according to the dl prefix. */
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static void
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grub_set_root_dev (void)
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{
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const char *prefix;
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grub_register_variable_hook ("root", 0, grub_env_write_root);
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grub_env_export ("root");
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prefix = grub_env_get ("prefix");
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if (prefix)
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{
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char *dev;
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dev = grub_file_get_device_name (prefix);
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if (dev)
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{
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grub_env_set ("root", dev);
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grub_free (dev);
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}
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}
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}
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/* Load the normal mode module and execute the normal mode if possible. */
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static void
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grub_load_normal_mode (void)
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{
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/* Load the module. */
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grub_dl_load ("normal");
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/* Something went wrong. Print errors here to let user know why we're entering rescue mode. */
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grub_print_error ();
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}
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/* The main routine. */
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void
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grub_main (void)
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{
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/* First of all, initialize the machine. */
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grub_machine_init ();
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/* Hello. */
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grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
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grub_printf ("Welcome to GRUB!\n\n");
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grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
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/* Load pre-loaded modules and free the space. */
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grub_register_exported_symbols ();
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grub_load_modules ();
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/* It is better to set the root device as soon as possible,
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for convenience. */
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grub_machine_set_prefix ();
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grub_env_export ("prefix");
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grub_set_root_dev ();
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/* Load the normal mode module. */
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grub_load_normal_mode ();
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/* Enter the rescue mode. */
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grub_enter_rescue_mode ();
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}
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