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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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52
grub-core/commands/i386/pc/smbios.c Normal file
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/* smbios.c - get smbios tables. */
/*
* 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/>.
*/
#include <grub/acpi.h>
#include <grub/smbios.h>
#include <grub/misc.h>
struct grub_smbios_eps *
grub_machine_smbios_get_eps (void)
{
grub_uint8_t *ptr;
grub_dprintf ("smbios", "Looking for SMBIOS EPS. Scanning BIOS\n");
for (ptr = (grub_uint8_t *) 0xf0000; ptr < (grub_uint8_t *) 0x100000; ptr += 16)
if (grub_memcmp (ptr, "_SM_", 4) == 0
&& grub_byte_checksum (ptr, sizeof (struct grub_smbios_eps)) == 0)
return (struct grub_smbios_eps *) ptr;
return 0;
}
struct grub_smbios_eps3 *
grub_machine_smbios_get_eps3 (void)
{
grub_uint8_t *ptr;
grub_dprintf ("smbios", "Looking for SMBIOS3 EPS. Scanning BIOS\n");
for (ptr = (grub_uint8_t *) 0xf0000; ptr < (grub_uint8_t *) 0x100000; ptr += 16)
if (grub_memcmp (ptr, "_SM3_", 5) == 0
&& grub_byte_checksum (ptr, sizeof (struct grub_smbios_eps3)) == 0)
return (struct grub_smbios_eps3 *) ptr;
return 0;
}