arch/all-pc/boot/grub2-aros/grub-core/kern/main.c

   1 /* main.c - the kernel main routine */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2002,2003,2005,2006,2008,2009  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/kernel.h>
  21 #include <grub/misc.h>
  22 #include <grub/symbol.h>
  23 #include <grub/dl.h>
  24 #include <grub/term.h>
  25 #include <grub/file.h>
  26 #include <grub/device.h>
  27 #include <grub/env.h>
  28 #include <grub/mm.h>
  29 #include <grub/command.h>
  30 #include <grub/reader.h>
  31 #include <grub/parser.h>
  32
  33 void
  34 grub_module_iterate (int (*hook) (struct grub_module_header *header))
  35 {
  36   struct grub_module_info *modinfo;
  37   struct grub_module_header *header;
  38   grub_addr_t modbase;
  39
  40   modbase = grub_arch_modules_addr ();
  41   modinfo = (struct grub_module_info *) modbase;
  42
  43   /* Check if there are any modules.  */
  44   if ((modinfo == 0) || modinfo->magic != GRUB_MODULE_MAGIC)
  45     return;
  46
  47   for (header = (struct grub_module_header *) (modbase + modinfo->offset);
  48        header < (struct grub_module_header *) (modbase + modinfo->size);
  49        header = (struct grub_module_header *) ((char *) header + header->size))
  50     {
  51       if (hook (header))
  52         break;
  53     }
  54 }
  55
  56 /* This is actualy platform-independant but used only on yeeloong and sparc.  */
  57 #if defined (GRUB_MACHINE_MIPS_YEELOONG) || defined (GRUB_MACHINE_SPARC64)
  58 grub_addr_t
  59 grub_modules_get_end (void)
  60 {
  61   struct grub_module_info *modinfo;
  62   grub_addr_t modbase;
  63
  64   modbase = grub_arch_modules_addr ();
  65   modinfo = (struct grub_module_info *) modbase;
  66
  67   /* Check if there are any modules.  */
  68   if ((modinfo == 0) || modinfo->magic != GRUB_MODULE_MAGIC)
  69     return modbase;
  70
  71   return modbase + modinfo->size;
  72 }
  73 #endif
  74
  75 /* Load all modules in core.  */
  76 static void
  77 grub_load_modules (void)
  78 {
  79   auto int hook (struct grub_module_header *);
  80   int hook (struct grub_module_header *header)
  81     {
  82       /* Not an ELF module, skip.  */
  83       if (header->type != OBJ_TYPE_ELF)
  84         return 0;
  85
  86       if (! grub_dl_load_core ((char *) header + sizeof (struct grub_module_header),
  87                                (header->size - sizeof (struct grub_module_header))))
  88         grub_fatal ("%s", grub_errmsg);
  89
  90       if (grub_errno)
  91         grub_print_error ();
  92
  93       return 0;
  94     }
  95
  96   grub_module_iterate (hook);
  97 }
  98
  99 static void
 100 grub_load_config (void)
 101 {
 102   auto int hook (struct grub_module_header *);
 103   int hook (struct grub_module_header *header)
 104     {
 105       /* Not an embedded config, skip.  */
 106       if (header->type != OBJ_TYPE_CONFIG)
 107         return 0;
 108
 109       grub_parser_execute ((char *) header +
 110                            sizeof (struct grub_module_header));
 111       return 1;
 112     }
 113
 114   grub_module_iterate (hook);
 115 }
 116
 117 /* Write hook for the environment variables of root. Remove surrounding
 118    parentheses, if any.  */
 119 static char *
 120 grub_env_write_root (struct grub_env_var *var __attribute__ ((unused)),
 121                      const char *val)
 122 {
 123   /* XXX Is it better to check the existence of the device?  */
 124   grub_size_t len = grub_strlen (val);
 125
 126   if (val[0] == '(' && val[len - 1] == ')')
 127     return grub_strndup (val + 1, len - 2);
 128
 129   return grub_strdup (val);
 130 }
 131
 132 /* Set the root device according to the dl prefix.  */
 133 static void
 134 grub_set_root_dev (void)
 135 {
 136   const char *prefix;
 137
 138   grub_register_variable_hook ("root", 0, grub_env_write_root);
 139
 140   prefix = grub_env_get ("prefix");
 141
 142   if (prefix)
 143     {
 144       char *dev;
 145
 146       dev = grub_file_get_device_name (prefix);
 147       if (dev)
 148         {
 149           grub_env_set ("root", dev);
 150           grub_free (dev);
 151         }
 152     }
 153 }
 154
 155 /* Load the normal mode module and execute the normal mode if possible.  */
 156 static void
 157 grub_load_normal_mode (void)
 158 {
 159   /* Load the module.  */
 160   grub_dl_load ("normal");
 161
 162   /* Something went wrong.  Print errors here to let user know why we're entering rescue mode.  */
 163   grub_print_error ();
 164   grub_errno = 0;
 165
 166   grub_command_execute ("normal", 0, 0);
 167 }
 168
 169 /* The main routine.  */
 170 void
 171 grub_main (void)
 172 {
 173   /* First of all, initialize the machine.  */
 174   grub_machine_init ();
 175
 176   /* Hello.  */
 177   grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
 178   grub_printf ("Welcome to GRUB!\n\n");
 179   grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
 180
 181   /* Load pre-loaded modules and free the space.  */
 182   grub_register_exported_symbols ();
 183 #ifdef GRUB_LINKER_HAVE_INIT
 184   grub_arch_dl_init_linker ();
 185 #endif
 186   grub_load_modules ();
 187
 188   /* It is better to set the root device as soon as possible,
 189      for convenience.  */
 190   grub_machine_set_prefix ();
 191   grub_set_root_dev ();
 192
 193   grub_register_core_commands ();
 194
 195   grub_load_config ();
 196   grub_load_normal_mode ();
 197   grub_rescue_run ();
 198 }