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> | |
31 | #include <asm/uaccess.h> | |
32 | ||
33 | /**************************************************/ | |
34 | /* the actual current config file */ | |
35 | ||
36 | /* | |
37 | * Define kernel_config_data and kernel_config_data_size, which contains the | |
38 | * wrapped and compressed configuration file. The file is first compressed | |
39 | * with gzip and then bounded by two eight byte magic numbers to allow | |
40 | * extraction from a binary kernel image: | |
41 | * | |
42 | * IKCFG_ST | |
43 | * <image> | |
44 | * IKCFG_ED | |
45 | */ | |
46 | #define MAGIC_START "IKCFG_ST" | |
47 | #define MAGIC_END "IKCFG_ED" | |
48 | #include "config_data.h" | |
49 | ||
50 | ||
51 | #define MAGIC_SIZE (sizeof(MAGIC_START) - 1) | |
52 | #define kernel_config_data_size \ | |
53 | (sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2) | |
54 | ||
55 | #ifdef CONFIG_IKCONFIG_PROC | |
56 | ||
1da177e4 LT |
57 | static ssize_t |
58 | ikconfig_read_current(struct file *file, char __user *buf, | |
59 | size_t len, loff_t * offset) | |
60 | { | |
85badbdf AM |
61 | return simple_read_from_buffer(buf, len, offset, |
62 | kernel_config_data + MAGIC_SIZE, | |
63 | kernel_config_data_size); | |
1da177e4 LT |
64 | } |
65 | ||
15ad7cdc | 66 | static const struct file_operations ikconfig_file_ops = { |
1da177e4 LT |
67 | .owner = THIS_MODULE, |
68 | .read = ikconfig_read_current, | |
6038f373 | 69 | .llseek = default_llseek, |
1da177e4 LT |
70 | }; |
71 | ||
1da177e4 LT |
72 | static int __init ikconfig_init(void) |
73 | { | |
74 | struct proc_dir_entry *entry; | |
75 | ||
76 | /* create the current config file */ | |
c33fff0a DL |
77 | entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, |
78 | &ikconfig_file_ops); | |
1da177e4 LT |
79 | if (!entry) |
80 | return -ENOMEM; | |
81 | ||
271a15ea | 82 | proc_set_size(entry, kernel_config_data_size); |
1da177e4 LT |
83 | |
84 | return 0; | |
85 | } | |
86 | ||
1da177e4 LT |
87 | static void __exit ikconfig_cleanup(void) |
88 | { | |
c74c120a | 89 | remove_proc_entry("config.gz", NULL); |
1da177e4 LT |
90 | } |
91 | ||
92 | module_init(ikconfig_init); | |
93 | module_exit(ikconfig_cleanup); | |
94 | ||
626a0312 SB |
95 | #endif /* CONFIG_IKCONFIG_PROC */ |
96 | ||
1da177e4 LT |
97 | MODULE_LICENSE("GPL"); |
98 | MODULE_AUTHOR("Randy Dunlap"); | |
99 | MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); |