bios.c

Linux下的系统信息获取

/* Copyright (C) 2001-2001 Fujitsu Siemens Computers
   Joachim Braeuer
   This file is part of smbios

   smbios 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.

   smbios 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.  See the GNU General Public License
   for more details.

   You should have received a copy of the GNU General Public License
   along with smbios; see the file COPYING. If not, write to the
   Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.
*/

/* $Log: bios.c,v $
/* Revision 1.1  2001/09/15 14:52:43  bretthauert
/* initial release
/*
 */

/** \file bios.c
 *  DMI-BIOS and SM-BIOS access functions
 *  The functions defined in this file provide low level access to the BIOS
 *  area that is comform to the DMI BIOS Specification or the SM-BIOS
 *  specification, respectively.
 *  
 *  \author Markus Lyra
 *  \author Thomas Bretthauer
 *	\author Joachim Braeuer
 *  \version 0.11
 *  \date January 2001
 */

#ifndef __KERNEL__
#  define __KERNEL__
#endif
#ifndef MODULE
#  define MODULE
#endif

#define __NO_VERSION__		/* don't define kernel_verion in module.h */
#include <linux/module.h>

#include <linux/kernel.h>	/* ... for 'printk()' */
#include <linux/errno.h>	/* ... error codes */
#include <linux/types.h>	/* ... fixed size types definitions, '__u8'... */
#include <linux/proc_fs.h>	/* ... for 'struct proc_dir_entry' */
#include <linux/string.h>	/* ... for 'memcpy()', 'strncmp()' */

#include "strgdef.h"        /* ... contains the string definitions for the cooked mode */
#include "bios.h"		    /* ... local declarations for DMI-, SM-BIOS */
#include "cooking.h"	    /* ... local declarations for interpreting DMI- and SM-BIOS types */


EXPORT_NO_SYMBOLS;

/*
 *  Global data
 */

/** SM-BIOS, resp. DMI-BIOS /proc/smbios directory */
struct proc_dir_entry *smbios_proc_dir = 0;
/** SM-BIOS, resp. DMI-BIOS /proc/smbios/raw directory */
struct proc_dir_entry *smbios_raw_proc_dir = 0;
/** SM-BIOS, resp. DMI-BIOS /proc/smbios/cooked directory */
struct proc_dir_entry *smbios_cooked_proc_dir = 0;
/** SM-BIOS, resp. DMI-BIOS virtual base address of F-Segment */
void *smbios_base = 0;
/** SM-BIOS entry point structure */
smbios_entry_point_struct *smbios_entry_point = 0;
/** DMI-BIOS entry point structure */
dmibios_entry_point_struct *dmibios_entry_point = 0;
/** SM-BIOS, resp. DMI-BIOS structures base address; starting point */
void *smbios_structures_base = 0;
/** enumeration of SM-BIOS, resp. DMI-BIOS types that do have subtypes */
__u8 smbios_types_with_subtypes[] = { TYPES_WITH_SUBTYPES };
/** contains the SMBIOS Version, e.g. V2.31 */
char smbios_version_string[32];



/*
 *  Functions
 */




/** \fn smbios_entry_point_struct * smbios_find_entry_point (void *base)
  * \brief find the SM-BIOS entry point structure 
  * \param base virtual base address of physical F-segment address 
  * \return pointer to the SM-BIOS entry point structure
  *
  * this function searches the BIOS F-segement (physical address 0x000f0000
  * to 0x000fffff) for the SM-BIOS entry point signature '_SM_'.
  *
  * \author Markus Lyra
  * \author Thomas Bretthauer
  * \date October 2000
  */

smbios_entry_point_struct *
smbios_find_entry_point (void *base)
{
    smbios_entry_point_struct *entry_point = 0;	/** SM-BIOS entry point */
    unsigned long *temp;				        /** temp. pointer       */


    /* search for the magic dword - '_SM_