245 lines
6.1 KiB
C
245 lines
6.1 KiB
C
/* main.c - the kernel main routine */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2002,2003,2005,2006,2008,2009 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <grub/kernel.h>
|
|
#include <grub/misc.h>
|
|
#include <grub/symbol.h>
|
|
#include <grub/dl.h>
|
|
#include <grub/term.h>
|
|
#include <grub/file.h>
|
|
#include <grub/device.h>
|
|
#include <grub/env.h>
|
|
#include <grub/mm.h>
|
|
#include <grub/command.h>
|
|
#include <grub/reader.h>
|
|
#include <grub/parser.h>
|
|
|
|
/* This is actualy platform-independant but used only on loongson and sparc. */
|
|
#if defined (GRUB_MACHINE_MIPS_LOONGSON) || defined (GRUB_MACHINE_MIPS_QEMU_MIPS) || defined (GRUB_MACHINE_SPARC64)
|
|
grub_addr_t
|
|
grub_modules_get_end (void)
|
|
{
|
|
struct grub_module_info *modinfo;
|
|
|
|
modinfo = (struct grub_module_info *) grub_modbase;
|
|
|
|
/* Check if there are any modules. */
|
|
if ((modinfo == 0) || modinfo->magic != GRUB_MODULE_MAGIC)
|
|
return grub_modbase;
|
|
|
|
return grub_modbase + modinfo->size;
|
|
}
|
|
#endif
|
|
|
|
/* Load all modules in core. */
|
|
static void
|
|
grub_load_modules (void)
|
|
{
|
|
struct grub_module_header *header;
|
|
FOR_MODULES (header)
|
|
{
|
|
/* Not an ELF module, skip. */
|
|
if (header->type != OBJ_TYPE_ELF)
|
|
continue;
|
|
|
|
if (! grub_dl_load_core ((char *) header + sizeof (struct grub_module_header),
|
|
(header->size - sizeof (struct grub_module_header))))
|
|
grub_fatal ("%s", grub_errmsg);
|
|
|
|
if (grub_errno)
|
|
grub_print_error ();
|
|
}
|
|
}
|
|
|
|
static void
|
|
grub_load_config (void)
|
|
{
|
|
struct grub_module_header *header;
|
|
FOR_MODULES (header)
|
|
{
|
|
/* Not an embedded config, skip. */
|
|
if (header->type != OBJ_TYPE_CONFIG)
|
|
continue;
|
|
|
|
grub_parser_execute ((char *) header +
|
|
sizeof (struct grub_module_header));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Write hook for the environment variables of root. Remove surrounding
|
|
parentheses, if any. */
|
|
static char *
|
|
grub_env_write_root (struct grub_env_var *var __attribute__ ((unused)),
|
|
const char *val)
|
|
{
|
|
/* XXX Is it better to check the existence of the device? */
|
|
grub_size_t len = grub_strlen (val);
|
|
|
|
if (val[0] == '(' && val[len - 1] == ')')
|
|
return grub_strndup (val + 1, len - 2);
|
|
|
|
return grub_strdup (val);
|
|
}
|
|
|
|
static void
|
|
grub_set_prefix_and_root (void)
|
|
{
|
|
char *device = NULL;
|
|
char *path = NULL;
|
|
char *fwdevice = NULL;
|
|
char *fwpath = NULL;
|
|
char *prefix = NULL;
|
|
struct grub_module_header *header;
|
|
|
|
FOR_MODULES (header)
|
|
if (header->type == OBJ_TYPE_PREFIX)
|
|
prefix = (char *) header + sizeof (struct grub_module_header);
|
|
|
|
grub_register_variable_hook ("root", 0, grub_env_write_root);
|
|
|
|
if (prefix)
|
|
{
|
|
char *pptr = NULL;
|
|
if (prefix[0] == '(')
|
|
{
|
|
pptr = grub_strrchr (prefix, ')');
|
|
if (pptr)
|
|
{
|
|
device = grub_strndup (prefix + 1, pptr - prefix - 1);
|
|
pptr++;
|
|
}
|
|
}
|
|
if (!pptr)
|
|
pptr = prefix;
|
|
if (pptr[0])
|
|
path = grub_strdup (pptr);
|
|
}
|
|
if ((!device || device[0] == ',' || !device[0]) || !path)
|
|
grub_machine_get_bootlocation (&fwdevice, &fwpath);
|
|
|
|
if (!device && fwdevice)
|
|
device = fwdevice;
|
|
else if (fwdevice && (device[0] == ',' || !device[0]))
|
|
{
|
|
/* We have a partition, but still need to fill in the drive. */
|
|
char *comma, *new_device;
|
|
|
|
for (comma = fwdevice; *comma; )
|
|
{
|
|
if (comma[0] == '\\' && comma[1] == ',')
|
|
{
|
|
comma += 2;
|
|
continue;
|
|
}
|
|
if (*comma == ',')
|
|
break;
|
|
comma++;
|
|
}
|
|
if (*comma)
|
|
{
|
|
char *drive = grub_strndup (fwdevice, comma - fwdevice);
|
|
new_device = grub_xasprintf ("%s%s", drive, device);
|
|
grub_free (drive);
|
|
}
|
|
else
|
|
new_device = grub_xasprintf ("%s%s", fwdevice, device);
|
|
|
|
grub_free (fwdevice);
|
|
grub_free (device);
|
|
device = new_device;
|
|
}
|
|
else
|
|
grub_free (fwdevice);
|
|
if (fwpath && !path)
|
|
{
|
|
grub_size_t len = grub_strlen (fwpath);
|
|
while (len > 1 && fwpath[len - 1] == '/')
|
|
fwpath[--len] = 0;
|
|
if (len >= sizeof (GRUB_TARGET_CPU "-" GRUB_PLATFORM) - 1
|
|
&& grub_memcmp (fwpath + len - (sizeof (GRUB_TARGET_CPU "-" GRUB_PLATFORM) - 1), GRUB_TARGET_CPU "-" GRUB_PLATFORM,
|
|
sizeof (GRUB_TARGET_CPU "-" GRUB_PLATFORM) - 1) == 0)
|
|
fwpath[len - (sizeof (GRUB_TARGET_CPU "-" GRUB_PLATFORM) - 1)] = 0;
|
|
path = fwpath;
|
|
}
|
|
else
|
|
grub_free (fwpath);
|
|
if (device)
|
|
{
|
|
char *prefix_set;
|
|
|
|
prefix_set = grub_xasprintf ("(%s)%s", device, path ? : "");
|
|
if (prefix_set)
|
|
{
|
|
grub_env_set ("prefix", prefix_set);
|
|
grub_free (prefix_set);
|
|
}
|
|
grub_env_set ("root", device);
|
|
}
|
|
|
|
grub_free (device);
|
|
grub_free (path);
|
|
grub_print_error ();
|
|
}
|
|
|
|
/* Load the normal mode module and execute the normal mode if possible. */
|
|
static void
|
|
grub_load_normal_mode (void)
|
|
{
|
|
/* Load the module. */
|
|
grub_dl_load ("normal");
|
|
|
|
/* Print errors if any. */
|
|
grub_print_error ();
|
|
grub_errno = 0;
|
|
|
|
grub_command_execute ("normal", 0, 0);
|
|
}
|
|
|
|
/* The main routine. */
|
|
void __attribute__ ((noreturn))
|
|
grub_main (void)
|
|
{
|
|
/* First of all, initialize the machine. */
|
|
grub_machine_init ();
|
|
|
|
/* Hello. */
|
|
grub_setcolorstate (GRUB_TERM_COLOR_HIGHLIGHT);
|
|
grub_printf ("Welcome to GRUB!\n\n");
|
|
grub_setcolorstate (GRUB_TERM_COLOR_STANDARD);
|
|
|
|
/* Load pre-loaded modules and free the space. */
|
|
grub_register_exported_symbols ();
|
|
#ifdef GRUB_LINKER_HAVE_INIT
|
|
grub_arch_dl_init_linker ();
|
|
#endif
|
|
grub_load_modules ();
|
|
|
|
/* It is better to set the root device as soon as possible,
|
|
for convenience. */
|
|
grub_set_prefix_and_root ();
|
|
grub_env_export ("root");
|
|
grub_env_export ("prefix");
|
|
|
|
grub_register_core_commands ();
|
|
|
|
grub_load_config ();
|
|
grub_load_normal_mode ();
|
|
grub_rescue_run ();
|
|
}
|