84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* kernel/configs.c
|
|
* Echo the kernel .config file used to build the kernel
|
|
*
|
|
* Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
|
|
* Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
|
|
* Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
|
|
* Copyright (C) 2002 Hewlett-Packard Company
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/init.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
/*
|
|
* "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
|
|
* a binary kernel image or a module. See scripts/extract-ikconfig.
|
|
*/
|
|
asm (
|
|
" .pushsection .rodata, \"a\" \n"
|
|
" .ascii \"IKCFG_ST\" \n"
|
|
" .global kernel_config_data \n"
|
|
"kernel_config_data: \n"
|
|
" .incbin \"kernel/config_data.gz\" \n"
|
|
" .global kernel_config_data_end \n"
|
|
"kernel_config_data_end: \n"
|
|
" .ascii \"IKCFG_ED\" \n"
|
|
" .popsection \n"
|
|
);
|
|
|
|
#ifdef CONFIG_IKCONFIG_PROC
|
|
|
|
extern char kernel_config_data;
|
|
extern char kernel_config_data_end;
|
|
|
|
static ssize_t
|
|
ikconfig_read_current(struct file *file, char __user *buf,
|
|
size_t len, loff_t * offset)
|
|
{
|
|
return simple_read_from_buffer(buf, len, offset,
|
|
&kernel_config_data,
|
|
&kernel_config_data_end -
|
|
&kernel_config_data);
|
|
}
|
|
|
|
static const struct file_operations ikconfig_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ikconfig_read_current,
|
|
.llseek = default_llseek,
|
|
};
|
|
|
|
static int __init ikconfig_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
/* create the current config file */
|
|
entry = proc_create("config.gz", S_IFREG | S_IRUGO, NULL,
|
|
&ikconfig_file_ops);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit ikconfig_cleanup(void)
|
|
{
|
|
remove_proc_entry("config.gz", NULL);
|
|
}
|
|
|
|
module_init(ikconfig_init);
|
|
module_exit(ikconfig_cleanup);
|
|
|
|
#endif /* CONFIG_IKCONFIG_PROC */
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Randy Dunlap");
|
|
MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
|