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smbios: Add a module for retrieving SMBIOS information

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The following are two use cases from Rajat Jain <rajatjain@juniper.net>:

  1) We have a board that boots Linux and this board itself can be plugged
     into one of different chassis types. We need to pass different
     parameters to the kernel based on the "CHASSIS_TYPE" information
     that is passed by the bios in the DMI/SMBIOS tables.

  2) We may have a USB stick that can go into multiple boards, and the
     exact kernel to be loaded depends on the machine information
     (PRODUCT_NAME etc) passed via the DMI.

Signed-off-by: David Michael <fedora.dm0@gmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
David Michael 2019-07-05 08:47:09 -04:00 • committed by Daniel Kiper
parent 261df54f17
commit 688023cd0a
7 changed files with 650 additions and 11 deletions
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69
include/grub/smbios.h Normal file
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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2019 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GRUB_SMBIOS_HEADER
#define GRUB_SMBIOS_HEADER 1
#include <grub/symbol.h>
#include <grub/types.h>
#define GRUB_SMBIOS_TYPE_END_OF_TABLE ((grub_uint8_t)127)
struct grub_smbios_ieps
{
grub_uint8_t anchor[5]; /* "_DMI_" */
grub_uint8_t checksum;
grub_uint16_t table_length;
grub_uint32_t table_address;
grub_uint16_t structures;
grub_uint8_t revision;
} GRUB_PACKED;
struct grub_smbios_eps
{
grub_uint8_t anchor[4]; /* "_SM_" */
grub_uint8_t checksum;
grub_uint8_t length; /* 0x1f */
grub_uint8_t version_major;
grub_uint8_t version_minor;
grub_uint16_t maximum_structure_size;
grub_uint8_t revision;
grub_uint8_t formatted[5];
struct grub_smbios_ieps intermediate;
} GRUB_PACKED;
struct grub_smbios_eps3
{
grub_uint8_t anchor[5]; /* "_SM3_" */
grub_uint8_t checksum;
grub_uint8_t length; /* 0x18 */
grub_uint8_t version_major;
grub_uint8_t version_minor;
grub_uint8_t docrev;
grub_uint8_t revision;
grub_uint8_t reserved;
grub_uint32_t maximum_table_length;
grub_uint64_t table_address;
} GRUB_PACKED;
extern struct grub_smbios_eps *grub_machine_smbios_get_eps (void);
extern struct grub_smbios_eps3 *grub_machine_smbios_get_eps3 (void);
extern struct grub_smbios_eps *EXPORT_FUNC (grub_smbios_get_eps) (void);
#endif /* ! GRUB_SMBIOS_HEADER */