1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * kernel/configs.c 2 * kernel/configs.c
4 * Echo the kernel .config file used to build 3 * Echo the kernel .config file used to build the kernel
5 * 4 *
6 * Copyright (C) 2002 Khalid Aziz <khalid_aziz 5 * Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
7 * Copyright (C) 2002 Randy Dunlap <rdunlap@xe 6 * Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
8 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com 7 * Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
9 * Copyright (C) 2002 Hewlett-Packard Company 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.
10 */ 24 */
11 25
12 #include <linux/kernel.h> 26 #include <linux/kernel.h>
13 #include <linux/module.h> 27 #include <linux/module.h>
14 #include <linux/proc_fs.h> 28 #include <linux/proc_fs.h>
15 #include <linux/seq_file.h> 29 #include <linux/seq_file.h>
16 #include <linux/init.h> 30 #include <linux/init.h>
17 #include <linux/uaccess.h> 31 #include <linux/uaccess.h>
18 32
19 /* 33 /*
20 * "IKCFG_ST" and "IKCFG_ED" are used to extra 34 * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
21 * a binary kernel image or a module. See scri 35 * a binary kernel image or a module. See scripts/extract-ikconfig.
22 */ 36 */
23 asm ( 37 asm (
24 " .pushsection .rodata, \"a\" 38 " .pushsection .rodata, \"a\" \n"
25 " .ascii \"IKCFG_ST\" 39 " .ascii \"IKCFG_ST\" \n"
26 " .global kernel_config_data 40 " .global kernel_config_data \n"
27 "kernel_config_data: 41 "kernel_config_data: \n"
28 " .incbin \"kernel/config_data.gz\" 42 " .incbin \"kernel/config_data.gz\" \n"
29 " .global kernel_config_data_end 43 " .global kernel_config_data_end \n"
30 "kernel_config_data_end: 44 "kernel_config_data_end: \n"
31 " .ascii \"IKCFG_ED\" 45 " .ascii \"IKCFG_ED\" \n"
32 " .popsection 46 " .popsection \n"
33 ); 47 );
34 48
35 #ifdef CONFIG_IKCONFIG_PROC 49 #ifdef CONFIG_IKCONFIG_PROC
36 50
37 extern char kernel_config_data; 51 extern char kernel_config_data;
38 extern char kernel_config_data_end; 52 extern char kernel_config_data_end;
39 53
40 static ssize_t 54 static ssize_t
41 ikconfig_read_current(struct file *file, char 55 ikconfig_read_current(struct file *file, char __user *buf,
42 size_t len, loff_t * off 56 size_t len, loff_t * offset)
43 { 57 {
44 return simple_read_from_buffer(buf, le 58 return simple_read_from_buffer(buf, len, offset,
45 &kernel 59 &kernel_config_data,
46 &kernel 60 &kernel_config_data_end -
47 &kernel 61 &kernel_config_data);
48 } 62 }
49 63
50 static const struct proc_ops config_gz_proc_op !! 64 static const struct file_operations ikconfig_file_ops = {
51 .proc_read = ikconfig_read_curren !! 65 .owner = THIS_MODULE,
52 .proc_lseek = default_llseek, !! 66 .read = ikconfig_read_current,
>> 67 .llseek = default_llseek,
53 }; 68 };
54 69
55 static int __init ikconfig_init(void) 70 static int __init ikconfig_init(void)
56 { 71 {
57 struct proc_dir_entry *entry; 72 struct proc_dir_entry *entry;
58 73
59 /* create the current config file */ 74 /* create the current config file */
60 entry = proc_create("config.gz", S_IFR 75 entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
61 &config_gz_proc_op !! 76 &ikconfig_file_ops);
62 if (!entry) 77 if (!entry)
63 return -ENOMEM; 78 return -ENOMEM;
64 79
65 proc_set_size(entry, &kernel_config_da 80 proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
66 81
67 return 0; 82 return 0;
68 } 83 }
69 84
70 static void __exit ikconfig_cleanup(void) 85 static void __exit ikconfig_cleanup(void)
71 { 86 {
72 remove_proc_entry("config.gz", NULL); 87 remove_proc_entry("config.gz", NULL);
73 } 88 }
74 89
75 module_init(ikconfig_init); 90 module_init(ikconfig_init);
76 module_exit(ikconfig_cleanup); 91 module_exit(ikconfig_cleanup);
77 92
78 #endif /* CONFIG_IKCONFIG_PROC */ 93 #endif /* CONFIG_IKCONFIG_PROC */
79 94
80 MODULE_LICENSE("GPL"); 95 MODULE_LICENSE("GPL");
81 MODULE_AUTHOR("Randy Dunlap"); 96 MODULE_AUTHOR("Randy Dunlap");
82 MODULE_DESCRIPTION("Echo the kernel .config fi 97 MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
83 98
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