Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / kernel / configs.c

diff --git a/kernel/kernel/configs.c b/kernel/kernel/configs.c
new file mode 100644 (file)
index 0000000..c18b1f1
--- /dev/null
+++ b/kernel/kernel/configs.c
@@ -0,0 +1,99 @@
+/*
+ * 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
+
+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,
+       .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_size);
+
+       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");