1 /* 2 * kernel/configs.c 3 * Echo the kernel .config file used to build the kernel 4 * 5 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com> 6 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net> 7 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com> 8 * Copyright (C) 2002 Hewlett-Packard Company 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or (at 13 * your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, but 16 * WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 18 * NON INFRINGEMENT. See the GNU General Public License for more 19 * details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/proc_fs.h> 29 #include <linux/seq_file.h> 30 #include <linux/init.h> 31 #include <linux/uaccess.h> 32 33 /* 34 * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from 35 * a binary kernel image or a module. See scripts/extract-ikconfig. 36 */ 37 asm ( 38 " .pushsection .rodata, \"a\" \n" 39 " .ascii \"IKCFG_ST\" \n" 40 " .global kernel_config_data \n" 41 "kernel_config_data: \n" 42 " .incbin \"kernel/config_data.gz\" \n" 43 " .global kernel_config_data_end \n" 44 "kernel_config_data_end: \n" 45 " .ascii \"IKCFG_ED\" \n" 46 " .popsection \n" 47 ); 48 49 #ifdef CONFIG_IKCONFIG_PROC 50 51 extern char kernel_config_data; 52 extern char kernel_config_data_end; 53 54 static ssize_t 55 ikconfig_read_current(struct file *file, char __user *buf, 56 size_t len, loff_t * offset) 57 { 58 return simple_read_from_buffer(buf, len, offset, 59 &kernel_config_data, 60 &kernel_config_data_end - 61 &kernel_config_data); 62 } 63 64 static const struct file_operations ikconfig_file_ops = { 65 .owner = THIS_MODULE, 66 .read = ikconfig_read_current, 67 .llseek = default_llseek, 68 }; 69 70 static int __init ikconfig_init(void) 71 { 72 struct proc_dir_entry *entry; 73 74 /* create the current config file */ 75 entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, 76 &ikconfig_file_ops); 77 if (!entry) 78 return -ENOMEM; 79 80 proc_set_size(entry, &kernel_config_data_end - &kernel_config_data); 81 82 return 0; 83 } 84 85 static void __exit ikconfig_cleanup(void) 86 { 87 remove_proc_entry("config.gz", NULL); 88 } 89 90 module_init(ikconfig_init); 91 module_exit(ikconfig_cleanup); 92 93 #endif /* CONFIG_IKCONFIG_PROC */ 94 95 MODULE_LICENSE("GPL"); 96 MODULE_AUTHOR("Randy Dunlap"); 97 MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); 98