[PATCH 2.4] add SMBIOS information to /proc/smbios -- UPDATED

From: Michael Brown (mebrown_at_michaels-house.net)
Date: 04/30/04

  • Next message: Frédéric L. W. Meunier: "Re: TCP: Hash tables configured" 
    To: linux-kernel@vger.kernel.org, marcelo.tosatti@cyclades.com, michael_e_brown@dell.com
Date:	Thu, 29 Apr 2004 21:21:52 -0500

    Marcelo, Al,
            Below is an updated patch to add SMBIOS information to /proc/smbios.
    Updates have been made per Al's previous comments. Please apply.

    For reference, here are previous postings:
    Previous 2.4 thread:
    http://marc.theaimsgroup.com/?t=108321757100001&r=1&w=1

    Previous 2.6 thread:
    http://marc.theaimsgroup.com/?t=108311959700002&r=1&w=1

    Thank you,
    Michael Brown

    # This is a BitKeeper generated diff -Nru style patch.
    #
    # ChangeSet
    # 2004/04/29 21:11:19-05:00 michael_e_brown@meb-laptop.michaels-house.net
    # Updates per Al Viro:
    # -- remove MOD_{INC,DEC}_USE_COUNT
    # -- use normal read call instead of proc read call
    #
    # drivers/char/smbios.c
    # 2004/04/29 21:11:17-05:00 michael_e_brown@meb-laptop.michaels-house.net +35 -47
    # Updates per comments from Al Viro.
    #
    # ChangeSet
    # 2004/04/29 00:16:35-05:00 michael_e_brown@meb-laptop.michaels-house.net
    # rename smbios to proper smbios.c
    #
    # drivers/char/Makefile
    # 2004/04/29 00:09:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +1 -1
    # rename smbios driver to 'smbios'.
    #
    # drivers/char/smbios.c
    # 2004/04/29 00:08:51-05:00 michael_e_brown@meb-laptop.michaels-house.net +0 -0
    # Rename: drivers/char/procsmbios.c -> drivers/char/smbios.c
    #
    # ChangeSet
    # 2004/04/28 23:51:19-05:00 michael_e_brown@meb-laptop.michaels-house.net
    # Add SMBIOS driver that exports system SMBIOS information as files in /proc/smbios.
    #
    # drivers/char/smbios.h
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +53 -0
    #
    # drivers/char/procsmbios.c
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +251 -0
    #
    # drivers/char/smbios.h
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +0 -0
    # BitKeeper file /home/michael_e_brown/kernel/bk/subtrees/smbios-24-driver/drivers/char/smbios.h
    #
    # drivers/char/procsmbios.c
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +0 -0
    # BitKeeper file /home/michael_e_brown/kernel/bk/subtrees/smbios-24-driver/drivers/char/procsmbios.c
    #
    # drivers/char/Makefile
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +1 -0
    # Add SMBIOS driver to build system
    #
    # drivers/char/Config.in
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +1 -0
    # Add config option to turn on SMBIOS proc driver
    #
    # Documentation/Configure.help
    # 2004/04/28 23:50:15-05:00 michael_e_brown@meb-laptop.michaels-house.net +14 -0
    # Add help text for SMBIOS driver
    #
    diff -Nru a/Documentation/Configure.help b/Documentation/Configure.help
    --- a/Documentation/Configure.help Thu Apr 29 21:13:45 2004
    +++ b/Documentation/Configure.help Thu Apr 29 21:13:45 2004
    @@ -19914,6 +19914,20 @@
     
       If unsure, say N.
     
    +SMBIOS table information in /proc
    +CONFIG_SMBIOS
    + This driver creates two files in /proc, /proc/smbios/table_entry_point
    + and /proc/smbios/table. These two files contain the contents of the
    + BIOS-generated SMBIOS tables. Generally, PC-like architectures made
    + after 1997 have this, it is safe to enable on any system.
    +
    + To compile this driver as a module ( = code which can be inserted in
    + and removed from the running kernel whenever you want), say M here
    + and read <file:Documentation/modules.txt>. The module will be called
    + smbios.o.
    +
    + If unsure, say N.
    +
     Sony Vaio Programmable I/O Control Device support
     CONFIG_SONYPI
       This driver enables access to the Sony Programmable I/O Control
    diff -Nru a/drivers/char/Config.in b/drivers/char/Config.in
    --- a/drivers/char/Config.in Thu Apr 29 21:13:45 2004
    +++ b/drivers/char/Config.in Thu Apr 29 21:13:45 2004
    @@ -333,6 +333,7 @@
     if [ "$CONFIG_EXPERIMENTAL" = "y" -a "$CONFIG_X86" = "y" -a "$CONFIG_X86_64" != "y" ]; then
        dep_tristate 'Sony Vaio Programmable I/O Control Device support (EXPERIMENTAL)' CONFIG_SONYPI $CONFIG_PCI
     fi
    +tristate 'SMBIOS table information in /proc' CONFIG_SMBIOS
     
     mainmenu_option next_comment
     comment 'Ftape, the floppy tape device driver'
    diff -Nru a/drivers/char/Makefile b/drivers/char/Makefile
    --- a/drivers/char/Makefile Thu Apr 29 21:13:45 2004
    +++ b/drivers/char/Makefile Thu Apr 29 21:13:45 2004
    @@ -265,6 +265,7 @@
     obj-$(CONFIG_HW_RANDOM) += hw_random.o
     obj-$(CONFIG_AMD_PM768) += amd76x_pm.o
     obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o
    +obj-$(CONFIG_SMBIOS) += smbios.o
     
     obj-$(CONFIG_ITE_GPIO) += ite_gpio.o
     obj-$(CONFIG_AU1X00_GPIO) += au1000_gpio.o
    diff -Nru a/drivers/char/smbios.c b/drivers/char/smbios.c
    --- /dev/null Wed Dec 31 16:00:00 1969
    +++ b/drivers/char/smbios.c Thu Apr 29 21:13:45 2004
    @@ -0,0 +1,239 @@
    +/*
    + * linux/drivers/firmware/smbios.c
    + * Copyright (C) 2002, 2003, 2004 Dell Inc.
    + * by Michael Brown <Michael_E_Brown@dell.com>
    + * vim:noet:ts=8:sw=8:filetype=c:textwidth=80:
    + *
    + * BIOS SMBIOS Table access
    + * conformant to DMTF SMBIOS definition
    + * at http://www.dmtf.org/standards/smbios
    + *
    + * This code takes information provided by SMBIOS tables
    + * and presents it in procfs as:
    + * /proc/smbios
    + * |--> /table_entry_point
    + * |--> /table
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License v2.0 as published by
    + * the Free Software Foundation
    + *
    + * 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. See the
    + * GNU General Public License for more details.
    + *
    + */
    +
    +
    +#include <linux/module.h>
    +#include <linux/init.h>
    +#include <linux/proc_fs.h>
    +#include <asm/io.h>
    +#include <asm/uaccess.h>
    +#include "smbios.h"
    +
    +#define SMBIOS_VERSION "1.0"
    +#define SMBIOS_DATE "2004-04-29"
    +
    +MODULE_AUTHOR("Michael Brown <Michael_E_Brown@Dell.com>");
    +MODULE_DESCRIPTION("procfs interface to SMBIOS information");
    +MODULE_LICENSE("GPL");
    +EXPORT_NO_SYMBOLS;
    +
    +struct smbios_device {
    + struct smbios_table_entry_point table_eps;
    + unsigned int smbios_table_real_length;
    +};
    +
    +/* there shall be only one */
    +static struct smbios_device the_smbios_device;
    +
    +static struct proc_dir_entry *smbios_dir, *table_eps_file, *table_file;
    +
    +static __init int
    +checksum_eps(struct smbios_table_entry_point *table_eps)
    +{
    + u8 *p = (u8 *)table_eps;
    + u8 checksum = 0;
    + int i=0;
    + for (i=0; i < table_eps->eps_length && i < sizeof(*table_eps); ++i) {
    + checksum += p[i];
    + }
    + return(checksum == 0);
    +}
    +
    +static __init int
    +find_table_entry_point(struct smbios_device *sdev)
    +{
    + struct smbios_table_entry_point *table_eps = &(sdev->table_eps);
    + u32 fp = 0xF0000;
    + while (fp < 0xFFFFF) {
    + isa_memcpy_fromio(table_eps, fp, sizeof(*table_eps));
    + if (memcmp(table_eps->anchor, "_SM_", 4)==0 &&
    + checksum_eps(table_eps)) {
    + return 0;
    + }
    + fp += 16;
    + }
    +
    + printk(KERN_INFO "SMBIOS table entry point not found in "
    + "0xF0000 - 0xFFFFF\n");
    + return -ENODEV;
    +}
    +
    +static __init int
    +find_table_max_address(struct smbios_device *sdev)
    +{
    + /* break out on one of three conditions:
    + * -- hit table_eps.table_length
    + * -- hit number of items that table claims we have
    + * -- hit structure type 127
    + */
    +
    + u8 *buf = ioremap(sdev->table_eps.table_address,
    + sdev->table_eps.table_length);
    + u8 *ptr = buf;
    + int count = 0, keep_going = 1;
    + int max_count = sdev->table_eps.table_num_structs;
    + int max_length = sdev->table_eps.table_length;
    + while(keep_going && ((ptr - buf) <= max_length) && count < max_count){
    + if (ptr[0] == 0x7F) /* ptr[0] is type */
    + keep_going = 0;
    +
    + ptr += ptr[1]; /* ptr[1] is length, skip structure */
    + /* skip strings at end of structure */
    + while((ptr-buf) < max_length && (ptr[0] || ptr[1]))
    + ++ptr;
    +
    + /* string area ends in double-null. skip it. */
    + ptr += 2;
    + ++count;
    + }
    + sdev->smbios_table_real_length = (ptr - buf);
    + iounmap(buf);
    +
    + if (count != max_count)
    + printk(KERN_INFO "Warning: SMBIOS table structure count"
    + " does not match count specified in the"
    + " table entry point.\n"
    + " Table entry point count: %d\n"
    + " Actual count: %d\n",
    + max_count, count);
    +
    + if (keep_going != 0)
    + printk(KERN_INFO "Warning: SMBIOS table does not end with a"
    + " structure type 127. This may indicate a"
    + " truncated table.");
    +
    + if (sdev->smbios_table_real_length != max_length)
    + printk(KERN_INFO "Warning: BIOS specified SMBIOS table length"
    + " does not match calculated length.\n"
    + " BIOS specified: %d\n"
    + " calculated length: %d\n",
    + max_length, sdev->smbios_table_real_length);
    +
    + return sdev->smbios_table_real_length;
    +}
    +
    +/* simple procfs style. Print the whole thing and let core
    + * handle splitting it out for userspace and setting eof.
    + */
    +static ssize_t
    +smbios_read_table_entry_point(char *page, char **start,
    + off_t off, int count,
    + int *eof, void *data)
    +{
    + unsigned int max_off = sizeof(the_smbios_device.table_eps);
    + memcpy(page, &the_smbios_device.table_eps, max_off);
    + return max_off;
    +}
    +
    +static ssize_t smbios_read_table(struct file *file, char *buf,
    + size_t count, loff_t *ppos)
    +{
    + unsigned long origppos = *ppos;
    + unsigned long max_off = the_smbios_device.smbios_table_real_length;
    + u8 *ptr;
    +
    + if(*ppos >= max_off)
    + return 0;
    +
    + if(count > (max_off - *ppos))
    + count = max_off - *ppos;
    +
    + ptr = ioremap(the_smbios_device.table_eps.table_address, max_off);
    + if (ptr == NULL)
    + return -ENXIO;
    +
    + while (*ppos < max_off) {
    + put_user(readb(ptr + *ppos), buf);
    + ++(*ppos); ++buf;
    + }
    + iounmap(ptr);
    + return *ppos - origppos;
    +}
    +
    +static struct file_operations proc_smbios_table_operations = {
    + .read = smbios_read_table,
    +};
    +
    +static int __init
    +smbios_init(void)
    +{
    + int rc=0;
    +
    + printk(KERN_INFO "SMBIOS facility v%s %s\n",
    + SMBIOS_VERSION, SMBIOS_DATE);
    +
    + rc = find_table_entry_point(&the_smbios_device);
    + if (rc)
    + return rc;
    +
    + find_table_max_address(&the_smbios_device);
    +
    + rc = -ENOMEM;
    + smbios_dir = proc_mkdir("smbios", NULL);
    + if (smbios_dir == NULL)
    + goto out;
    +
    + smbios_dir->owner = THIS_MODULE;
    +
    + table_eps_file = create_proc_read_entry("table_entry_point",
    + 0444, smbios_dir,
    + smbios_read_table_entry_point,
    + NULL);
    + if (table_eps_file == NULL)
    + goto no_table_eps_file;
    +
    + table_eps_file->owner = THIS_MODULE;
    +
    + table_file = create_proc_entry("table", 0444, smbios_dir);
    + if (table_file == NULL)
    + goto no_table_file;
    +
    + table_file->proc_fops = &proc_smbios_table_operations;
    + table_file->owner = THIS_MODULE;
    +
    + rc = 0;
    + goto out;
    +no_table_file:
    + remove_proc_entry("table_entry_point", smbios_dir);
    +
    +no_table_eps_file:
    + remove_proc_entry("smbios", NULL);
    +
    +out:
    + return rc;
    +}
    +
    +static void __exit
    +smbios_exit(void)
    +{
    + remove_proc_entry("table_entry_point", smbios_dir);
    + remove_proc_entry("table", smbios_dir);
    + remove_proc_entry("smbios", NULL);
    +}
    +
    +module_init(smbios_init);
    +module_exit(smbios_exit);
    diff -Nru a/drivers/char/smbios.h b/drivers/char/smbios.h
    --- /dev/null Wed Dec 31 16:00:00 1969
    +++ b/drivers/char/smbios.h Thu Apr 29 21:13:45 2004
    @@ -0,0 +1,53 @@
    +/*
    + * linux/drivers/firmware/smbios.c
    + * Copyright (C) 2002, 2003, 2004 Dell Inc.
    + * by Michael Brown <Michael_E_Brown@dell.com>
    + * vim:noet:ts=8:sw=8:filetype=c:textwidth=80:
    + *
    + * BIOS SMBIOS Table access
    + * conformant to DMTF SMBIOS definition
    + * at http://www.dmtf.org/standards/smbios
    + *
    + * This code takes information provided by SMBIOS tables
    + * and presents it in sysfs.
    + *
    + * This program is free software; you can redistribute it and/or modify
    + * it under the terms of the GNU General Public License v2.0 as published by
    + * the Free Software Foundation
    + *
    + * 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. See the
    + * GNU General Public License for more details.
    + *
    + */
    +
    +#ifndef _LINUX_SMBIOS_H
    +#define _LINUX_SMBIOS_H
    +
    +#include <linux/types.h>
    +
    +struct smbios_table_entry_point {
    + u8 anchor[4];
    + u8 checksum;
    + u8 eps_length;
    + u8 major_ver;
    + u8 minor_ver;
    + u16 max_struct_size;
    + u8 revision;
    + u8 formatted_area[5];
    + u8 dmi_anchor[5];
    + u8 intermediate_checksum;
    + u16 table_length;
    + u32 table_address;
    + u16 table_num_structs;
    + u8 smbios_bcd_revision;
    +} __attribute__ ((packed));
    +
    +struct smbios_structure_header {
    + u8 type;
    + u8 length;
    + u16 handle;
    +} __attribute__ ((packed));
    +
    +#endif /* _LINUX_SMBIOS_H */

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  • Next message: Frédéric L. W. Meunier: "Re: TCP: Hash tables configured"

    Relevant Pages

    • [PATCH 2.4] add SMBIOS information to /proc/smbios -- UPDATE 2
      ... integrated per Al's review comments. ... # ChangeSet ... # rename smbios driver to 'smbios'. ... # Add SMBIOS driver that exports system SMBIOS information as files in /proc/smbios. ...
      (Linux-Kernel)
    • [PATCH 2.4] add SMBIOS information to /proc/smbios/
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