grub/kern/main.c
okuji 5f968e1e61 2005-07-20 Yoshinori K. Okuji <okuji@enbug.org>
Change the semantics of variable hooks. They now return	strings
	instead of error values.

	* util/i386/pc/grub-setup.c: Include grub/env.h.
	(setup): Use grub_device_set_root instead of grub_env_set.

	* kern/rescue.c (grub_rescue_cmd_root): Use grub_env_set and
	grub_env_get instead of grub_device_set_root and
	grub_device_get_root, respectively.

	* kern/main.c (grub_env_write_root): New function.
	(grub_set_root_dev): Register grub_env_write_hook for "root". Use
	grub_env_set instead of grub_device_set_root.

	* kern/env.c (HASHSZ): Reduced to 13, because GRUB does not need
	many variables.
	(grub_env_set): Set ENV->VALUE to the result of ENV->WRITE_HOOK
	rather than calling ENV->WRITE_HOOK afterwards.
	(grub_env_get): Return the result of ENV->READ_HOOK rather than
	passing a pointer of a pointer.
	(grub_register_variable_hook): Change the types of "read_hook" and
	"write_hook" to grub_env_read_hook_t and grub_env_write_hook_t,
	respectively.
	Allocate the default empty string on the heap, because this string
	may be freed later.

	* kern/device.c: Include grub/env.h.
	(grub_device_set_root): Removed.
	(grub_device_get_root): Likewise.
	(grub_device_open): Use grub_env_get instead of
	grub_device_get_root.

	* include/grub/env.h (grub_env_read_hook_t): New type.
	(grub_env_write_hook_t): Likewise.
	(grub_env_var): Change the types of "read_hook" and "write_hook"
	to grub_env_read_hook_t and grub_env_write_hook_t, respectively.
	(grub_register_variable_hook): Likewise.

	* include/grub/device.h (grub_device_set_root): Removed.
	(grub_device_set_root): Likewise.

	* fs/fat.c (grub_fat_dir): Make a copy of PATH in DIRNAME, and
	make sure that DIRNAME terminates with '/', so that
	grub_fat_find_dir will fail if PATH is not a directory.

	* commands/ls.c (grub_ls_list_files): Remove the qualifier const
	from DIRNAME.
	Use the qualifier auto for print_files and print_files_long.
	If FS->DIR sets GRUB_ERRNO to GRUB_ERR_BAD_FILE_TYPE, try DIRNAME
	as a regular file.
	Put a newline only if there is no error.
	(grub_cmd_ls): Remove grub_ls_print_files, because this is not
	used.
2005-07-20 20:30:46 +00:00

133 lines
3.6 KiB
C

/* main.c - the kernel main routine */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2002, 2003, 2005 Free Software Foundation, Inc.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <grub/kernel.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/symbol.h>
#include <grub/dl.h>
#include <grub/term.h>
#include <grub/rescue.h>
#include <grub/file.h>
#include <grub/device.h>
#include <grub/env.h>
/* Load all modules in core. */
static void
grub_load_modules (void)
{
struct grub_module_info *modinfo;
struct grub_module_header *header;
grub_addr_t modbase;
modbase = grub_arch_modules_addr ();
modinfo = (struct grub_module_info *) modbase;
/* Check if there are any modules. */
if ((modinfo == 0) || modinfo->magic != GRUB_MODULE_MAGIC)
return;
for (header = (struct grub_module_header *) (modbase + modinfo->offset);
header < (struct grub_module_header *) (modbase + modinfo->size);
header = (struct grub_module_header *) ((char *) header + header->size))
{
if (! grub_dl_load_core ((char *) header + header->offset,
(header->size - header->offset)))
grub_fatal ("%s", grub_errmsg);
}
/* Add the region where modules reside into dynamic memory. */
grub_mm_init_region ((void *) modinfo, modinfo->size);
}
/* Write hook for the environment variables of root. Remove surrounding
parentheses, if any. */
static char *
grub_env_write_root (struct grub_env_var *var, 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);
}
/* Set the root device according to the dl prefix. */
static void
grub_set_root_dev (void)
{
const char *prefix;
grub_register_variable_hook ("root", 0, grub_env_write_root);
prefix = grub_env_get ("prefix");
if (prefix)
{
char *dev;
dev = grub_file_get_device_name (prefix);
if (dev)
{
grub_env_set ("root", dev);
grub_free (dev);
}
}
}
/* 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");
/* Ignore any error, because we have the rescue mode anyway. */
grub_errno = GRUB_ERR_NONE;
}
/* The main routine. */
void
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);
/* It is better to set the root device as soon as possible,
for convenience. */
grub_set_root_dev ();
/* Load pre-loaded modules and free the space. */
grub_register_exported_symbols ();
grub_load_modules ();
/* Load the normal mode module. */
grub_load_normal_mode ();
/* Enter the rescue mode. */
grub_enter_rescue_mode ();
}