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x86 boot : export boot_params via debugfs for debugging

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This patch export the boot parameters via debugfs for debugging.

The files added are as follow:

boot_params/data    :  binary file for struct boot_params
boot_params/version :  boot protocol version

This patch is based on 2.6.24-rc5-mm1 and has been tested on i386 and
x86_64 platform.

This patch is based on the Peter Anvin's proposal.

Signed-off-by: Huang Ying <ying.huang@intel.com>

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Huang, Ying
2008-01-30 13:32:51 +01:00
committed by Ingo Molnar
parent 4d022e35fd
commit 6d7d743375
5 changed files with 81 additions and 1 deletions
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65
arch/x86/kernel/kdebugfs.c Normal file
View File

@ -0,0 +1,65 @@
/*
* Architecture specific debugfs files
*
* Copyright (C) 2007, Intel Corp.
* Huang Ying <ying.huang@intel.com>
*
* This file is released under the GPLv2.
*/
#include <linux/debugfs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <asm/setup.h>
#ifdef CONFIG_DEBUG_BOOT_PARAMS
static struct debugfs_blob_wrapper boot_params_blob = {
.data = &boot_params,
.size = sizeof(boot_params),
};
static int __init boot_params_kdebugfs_init(void)
{
int error;
struct dentry *dbp, *version, *data;
dbp = debugfs_create_dir("boot_params", NULL);
if (!dbp) {
error = -ENOMEM;
goto err_return;
}
version = debugfs_create_x16("version", S_IRUGO, dbp,
&boot_params.hdr.version);
if (!version) {
error = -ENOMEM;
goto err_dir;
}
data = debugfs_create_blob("data", S_IRUGO, dbp,
&boot_params_blob);
if (!data) {
error = -ENOMEM;
goto err_version;
}
return 0;
err_version:
debugfs_remove(version);
err_dir:
debugfs_remove(dbp);
err_return:
return error;
}
#endif
static int __init arch_kdebugfs_init(void)
{
int error = 0;
#ifdef CONFIG_DEBUG_BOOT_PARAMS
error = boot_params_kdebugfs_init();
#endif
return error;
}
arch_initcall(arch_kdebugfs_init);