109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/*
|
|
* 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
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or (at
|
|
* your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
|
|
* NON INFRINGEMENT. See the GNU General Public License for more
|
|
* details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/init.h>
|
|
#include <asm/uaccess.h>
|
|
|
|
/**************************************************/
|
|
/* the actual current config file */
|
|
|
|
/*
|
|
* Define kernel_config_data and kernel_config_data_size, which contains the
|
|
* wrapped and compressed configuration file. The file is first compressed
|
|
* with gzip and then bounded by two eight byte magic numbers to allow
|
|
* extraction from a binary kernel image:
|
|
*
|
|
* IKCFG_ST
|
|
* <image>
|
|
* IKCFG_ED
|
|
*/
|
|
#define MAGIC_START "IKCFG_ST"
|
|
#define MAGIC_END "IKCFG_ED"
|
|
#include "config_data.h"
|
|
|
|
|
|
#define MAGIC_SIZE (sizeof(MAGIC_START) - 1)
|
|
#define kernel_config_data_size \
|
|
(sizeof(kernel_config_data) - 1 - MAGIC_SIZE * 2)
|
|
|
|
#ifdef CONFIG_IKCONFIG_PROC
|
|
|
|
/**************************************************/
|
|
/* globals and useful constants */
|
|
|
|
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 + MAGIC_SIZE,
|
|
kernel_config_data_size);
|
|
}
|
|
|
|
static const struct file_operations ikconfig_file_ops = {
|
|
.owner = THIS_MODULE,
|
|
.read = ikconfig_read_current,
|
|
};
|
|
|
|
/***************************************************/
|
|
/* ikconfig_init: start up everything we need to */
|
|
|
|
static int __init ikconfig_init(void)
|
|
{
|
|
struct proc_dir_entry *entry;
|
|
|
|
/* create the current config file */
|
|
entry = create_proc_entry("config.gz", S_IFREG | S_IRUGO,
|
|
&proc_root);
|
|
if (!entry)
|
|
return -ENOMEM;
|
|
|
|
entry->proc_fops = &ikconfig_file_ops;
|
|
entry->size = kernel_config_data_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/***************************************************/
|
|
/* ikconfig_cleanup: clean up our mess */
|
|
|
|
static void __exit ikconfig_cleanup(void)
|
|
{
|
|
remove_proc_entry("config.gz", &proc_root);
|
|
}
|
|
|
|
module_init(ikconfig_init);
|
|
module_exit(ikconfig_cleanup);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Randy Dunlap");
|
|
MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");
|
|
|
|
#endif /* CONFIG_IKCONFIG_PROC */
|