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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 <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 | |
57 | static ssize_t |
58 | ikconfig_read_current(struct file *file, char __user *buf, |
59 | size_t len, loff_t * offset) |
60 | { |
61 | return simple_read_from_buffer(buf, len, offset, |
62 | kernel_config_data + MAGIC_SIZE, |
63 | kernel_config_data_size); |
64 | } |
65 | |
66 | static const struct file_operations ikconfig_file_ops = { |
67 | .owner = THIS_MODULE, |
68 | .read = ikconfig_read_current, |
69 | .llseek = default_llseek, |
70 | }; |
71 | |
72 | static int __init ikconfig_init(void) |
73 | { |
74 | struct proc_dir_entry *entry; |
75 | |
76 | /* create the current config file */ |
77 | entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL, |
78 | &ikconfig_file_ops); |
79 | if (!entry) |
80 | return -ENOMEM; |
81 | |
82 | entry->size = kernel_config_data_size; |
83 | |
84 | return 0; |
85 | } |
86 | |
87 | static void __exit ikconfig_cleanup(void) |
88 | { |
89 | remove_proc_entry("config.gz", NULL); |
90 | } |
91 | |
92 | module_init(ikconfig_init); |
93 | module_exit(ikconfig_cleanup); |
94 | |
95 | MODULE_LICENSE("GPL"); |
96 | MODULE_AUTHOR("Randy Dunlap"); |
97 | MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); |
98 | |
99 | #endif /* CONFIG_IKCONFIG_PROC */ |
100 |
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