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Commit | Line | Data |
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1da177e4 LT |
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> | |
f4b09ebc | 6 | * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net> |
1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
7c0f6ba6 | 31 | #include <linux/uaccess.h> |
1da177e4 | 32 | |
1da177e4 | 33 | /* |
13610aa9 MY |
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. | |
1da177e4 | 36 | */ |
13610aa9 MY |
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 | ); | |
1da177e4 LT |
48 | |
49 | #ifdef CONFIG_IKCONFIG_PROC | |
50 | ||
13610aa9 MY |
51 | extern char kernel_config_data; |
52 | extern char kernel_config_data_end; | |
53 | ||
1da177e4 LT |
54 | static ssize_t |
55 | ikconfig_read_current(struct file *file, char __user *buf, | |
56 | size_t len, loff_t * offset) | |
57 | { | |
85badbdf | 58 | return simple_read_from_buffer(buf, len, offset, |
13610aa9 MY |
59 | &kernel_config_data, |
60 | &kernel_config_data_end - | |
61 | &kernel_config_data); | |
1da177e4 LT |
62 | } |
63 | ||
15ad7cdc | 64 | static const struct file_operations ikconfig_file_ops = { |
1da177e4 LT |
65 | .owner = THIS_MODULE, |
66 | .read = ikconfig_read_current, | |
6038f373 | 67 | .llseek = default_llseek, |
1da177e4 LT |
68 | }; |
69 | ||
1da177e4 LT |
70 | static int __init ikconfig_init(void) |
71 | { | |
72 | struct proc_dir_entry *entry; | |
73 | ||
74 | /* create the current config file */ | |
c33fff0a DL |
75 | entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, |
76 | &ikconfig_file_ops); | |
1da177e4 LT |
77 | if (!entry) |
78 | return -ENOMEM; | |
79 | ||
13610aa9 | 80 | proc_set_size(entry, &kernel_config_data_end - &kernel_config_data); |
1da177e4 LT |
81 | |
82 | return 0; | |
83 | } | |
84 | ||
1da177e4 LT |
85 | static void __exit ikconfig_cleanup(void) |
86 | { | |
c74c120a | 87 | remove_proc_entry("config.gz", NULL); |
1da177e4 LT |
88 | } |
89 | ||
90 | module_init(ikconfig_init); | |
91 | module_exit(ikconfig_cleanup); | |
92 | ||
626a0312 SB |
93 | #endif /* CONFIG_IKCONFIG_PROC */ |
94 | ||
1da177e4 LT |
95 | MODULE_LICENSE("GPL"); |
96 | MODULE_AUTHOR("Randy Dunlap"); | |
97 | MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); |