5f968e1e61
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.
133 lines
3.6 KiB
C
133 lines
3.6 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 Free Software Foundation, Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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/mm.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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/* 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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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 (! grub_dl_load_core ((char *) header + header->offset,
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(header->size - header->offset)))
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grub_fatal ("%s", grub_errmsg);
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}
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/* Add the region where modules reside into dynamic memory. */
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grub_mm_init_region ((void *) modinfo, modinfo->size);
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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, 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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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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/* Ignore any error, because we have the rescue mode anyway. */
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grub_errno = GRUB_ERR_NONE;
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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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/* It is better to set the root device as soon as possible,
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for convenience. */
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grub_set_root_dev ();
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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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/* 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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