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