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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/config.h> | |
27 | #include <linux/kernel.h> | |
28 | #include <linux/module.h> | |
29 | #include <linux/proc_fs.h> | |
30 | #include <linux/seq_file.h> | |
31 | #include <linux/init.h> | |
32 | #include <asm/uaccess.h> | |
33 | ||
34 | /**************************************************/ | |
35 | /* the actual current config file */ | |
36 | ||
37 | /* | |
38 | * Define kernel_config_data and kernel_config_data_size, which contains the | |
39 | * wrapped and compressed configuration file. The file is first compressed | |
40 | * with gzip and then bounded by two eight byte magic numbers to allow | |
41 | * extraction from a binary kernel image: | |
42 | * | |
43 | * IKCFG_ST | |
44 | * <image> | |
45 | * IKCFG_ED | |
46 | */ | |
47 | #define MAGIC_START "IKCFG_ST" | |
48 | #define MAGIC_END "IKCFG_ED" | |
49 | #include "config_data.h" | |
50 | ||
51 | ||
52 | #define MAGIC_SIZE (sizeof(MAGIC_START) - 1) | |
53 | #define kernel_config_data_size \ | |
54 | (sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2) | |
55 | ||
56 | #ifdef CONFIG_IKCONFIG_PROC | |
57 | ||
58 | /**************************************************/ | |
59 | /* globals and useful constants */ | |
60 | ||
61 | static ssize_t | |
62 | ikconfig_read_current(struct file *file, char __user *buf, | |
63 | size_t len, loff_t * offset) | |
64 | { | |
65 | loff_t pos = *offset; | |
66 | ssize_t count; | |
67 | ||
68 | if (pos >= kernel_config_data_size) | |
69 | return 0; | |
70 | ||
71 | count = min(len, (size_t)(kernel_config_data_size - pos)); | |
72 | if (copy_to_user(buf, kernel_config_data + MAGIC_SIZE + pos, count)) | |
73 | return -EFAULT; | |
74 | ||
75 | *offset += count; | |
76 | return count; | |
77 | } | |
78 | ||
79 | static struct file_operations ikconfig_file_ops = { | |
80 | .owner = THIS_MODULE, | |
81 | .read = ikconfig_read_current, | |
82 | }; | |
83 | ||
84 | /***************************************************/ | |
85 | /* ikconfig_init: start up everything we need to */ | |
86 | ||
87 | static int __init ikconfig_init(void) | |
88 | { | |
89 | struct proc_dir_entry *entry; | |
90 | ||
91 | /* create the current config file */ | |
92 | entry = create_proc_entry("config.gz", S_IFREG | S_IRUGO, | |
93 | &proc_root); | |
94 | if (!entry) | |
95 | return -ENOMEM; | |
96 | ||
97 | entry->proc_fops = &ikconfig_file_ops; | |
98 | entry->size = kernel_config_data_size; | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | /***************************************************/ | |
104 | /* ikconfig_cleanup: clean up our mess */ | |
105 | ||
106 | static void __exit ikconfig_cleanup(void) | |
107 | { | |
108 | remove_proc_entry("config.gz", &proc_root); | |
109 | } | |
110 | ||
111 | module_init(ikconfig_init); | |
112 | module_exit(ikconfig_cleanup); | |
113 | ||
114 | MODULE_LICENSE("GPL"); | |
115 | MODULE_AUTHOR("Randy Dunlap"); | |
116 | MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel"); | |
117 | ||
118 | #endif /* CONFIG_IKCONFIG_PROC */ |