[linux-2.6-block.git] / kernel / configs.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 <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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* kernel/configs.c
	3	* Echo the kernel .config file used to build the kernel
	4	*
	5	* Copyright (C) 2002 Khalid Aziz <khalid_aziz@hp.com>
f4b09ebc	6	* Copyright (C) 2002 Randy Dunlap <rdunlap@xenotime.net>
1da177e4 LT	7	* Copyright (C) 2002 Al Stone <ahs3@fc.hp.com>
	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.
	24	*/
	25
1da177e4 LT	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/proc_fs.h>
	29	#include <linux/seq_file.h>
	30	#include <linux/init.h>
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4	32
1da177e4	33	/*
13610aa9 MY	34	* "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
13610aa9 MY	35	* a binary kernel image or a module. See scripts/extract-ikconfig.
1da177e4	36	*/
13610aa9 MY	37	asm (
	38	" .pushsection .rodata, \"a\" \n"
	39	" .ascii \"IKCFG_ST\" \n"
	40	" .global kernel_config_data \n"
	41	"kernel_config_data: \n"
	42	" .incbin \"kernel/config_data.gz\" \n"
	43	" .global kernel_config_data_end \n"
	44	"kernel_config_data_end: \n"
	45	" .ascii \"IKCFG_ED\" \n"
	46	" .popsection \n"
	47	);
1da177e4 LT	48
	49	#ifdef CONFIG_IKCONFIG_PROC
	50
13610aa9 MY	51	extern char kernel_config_data;
	52	extern char kernel_config_data_end;
	53
1da177e4 LT	54	static ssize_t
	55	ikconfig_read_current(struct file file, char __user buf,
	56	size_t len, loff_t * offset)
	57	{
85badbdf	58	return simple_read_from_buffer(buf, len, offset,
13610aa9 MY	59	&kernel_config_data,
	60	&kernel_config_data_end -
	61	&kernel_config_data);
1da177e4 LT	62	}
1da177e4 LT	63
15ad7cdc	64	static const struct file_operations ikconfig_file_ops = {
1da177e4 LT	65	.owner = THIS_MODULE,
1da177e4 LT	66	.read = ikconfig_read_current,
6038f373	67	.llseek = default_llseek,
1da177e4 LT	68	};
1da177e4 LT	69
1da177e4 LT	70	static int __init ikconfig_init(void)
	71	{
	72	struct proc_dir_entry *entry;
	73
	74	/* create the current config file */
c33fff0a DL	75	entry = proc_create("config.gz", S_IFREG \| S_IRUGO, NULL,
c33fff0a DL	76	&ikconfig_file_ops);
1da177e4 LT	77	if (!entry)
	78	return -ENOMEM;
	79
13610aa9	80	proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
1da177e4 LT	81
	82	return 0;
	83	}
	84
1da177e4 LT	85	static void __exit ikconfig_cleanup(void)
1da177e4 LT	86	{
c74c120a	87	remove_proc_entry("config.gz", NULL);
1da177e4 LT	88	}
	89
	90	module_init(ikconfig_init);
	91	module_exit(ikconfig_cleanup);
	92
626a0312 SB	93	#endif /* CONFIG_IKCONFIG_PROC */
626a0312 SB	94
1da177e4 LT	95	MODULE_LICENSE("GPL");
	96	MODULE_AUTHOR("Randy Dunlap");
	97	MODULE_DESCRIPTION("Echo the kernel .config file used to build the kernel");