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