| /* |
| * kernel/configs.c |
| * Echo the kernel .config file used to build the kernel |
| * |
| * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com> |
| * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net> |
| * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com> |
| * Copyright (C) 2002 Hewlett-Packard Company |
| * |
| * 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, GOOD TITLE or |
| * NON INFRINGEMENT. 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 <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/init.h> |
| #include <linux/uaccess.h> |
| |
| /* |
| * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from |
| * a binary kernel image or a module. See scripts/extract-ikconfig. |
| */ |
| asm ( |
| " .pushsection .rodata, \"a\" \n" |
| " .ascii \"IKCFG_ST\" \n" |
| " .global kernel_config_data \n" |
| "kernel_config_data: \n" |
| " .incbin \"kernel/config_data.gz\" \n" |
| " .global kernel_config_data_end \n" |
| "kernel_config_data_end: \n" |
| " .ascii \"IKCFG_ED\" \n" |
| " .popsection \n" |
| ); |
| |
| #ifdef CONFIG_IKCONFIG_PROC |
| |
| extern char kernel_config_data; |
| extern char kernel_config_data_end; |
| |
| static ssize_t |
| ikconfig_read_current(struct file *file, char __user *buf, |
| size_t len, loff_t * offset) |
| { |
| return simple_read_from_buffer(buf, len, offset, |
| &kernel_config_data, |
| &kernel_config_data_end - |
| &kernel_config_data); |
| } |
| |
| static const struct file_operations ikconfig_file_ops = { |
| .owner = THIS_MODULE, |
| .read = ikconfig_read_current, |
| .llseek = default_llseek, |
| }; |
| |
| static int __init ikconfig_init(void) |
| { |
| struct proc_dir_entry *entry; |
| |
| /* create the current config file */ |
| entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, |
| &ikconfig_file_ops); |
| if (!entry) |
| return -ENOMEM; |
| |
| proc_set_size(entry, &kernel_config_data_end - &kernel_config_data); |
| |
| return 0; |
| } |
| |
| static void __exit ikconfig_cleanup(void) |
| { |
| remove_proc_entry("config.gz", NULL); |
| } |
| |
| module_init(ikconfig_init); |
| module_exit(ikconfig_cleanup); |
| |
| #endif /* CONFIG_IKCONFIG_PROC */ |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Randy Dunlap"); |
| MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); |