diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /kernel/configs.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'kernel/configs.c')
-rw-r--r-- | kernel/configs.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/kernel/configs.c b/kernel/configs.c new file mode 100644 index 000000000000..986f7af31e0a --- /dev/null +++ b/kernel/configs.c @@ -0,0 +1,118 @@ +/* + * 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 <rddunlap@osdl.org> + * 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/config.h> +#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) +{ + loff_t pos = *offset; + ssize_t count; + + if (pos >= kernel_config_data_size) + return 0; + + count = min(len, (size_t)(kernel_config_data_size - pos)); + if (copy_to_user(buf, kernel_config_data + MAGIC_SIZE + pos, count)) + return -EFAULT; + + *offset += count; + return count; +} + +static 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 */ |