688023cd0a
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>
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* smbios.c - get smbios tables. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2019 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/acpi.h>
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#include <grub/smbios.h>
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#include <grub/misc.h>
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struct grub_smbios_eps *
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grub_machine_smbios_get_eps (void)
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{
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grub_uint8_t *ptr;
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grub_dprintf ("smbios", "Looking for SMBIOS EPS. Scanning BIOS\n");
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for (ptr = (grub_uint8_t *) 0xf0000; ptr < (grub_uint8_t *) 0x100000; ptr += 16)
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if (grub_memcmp (ptr, "_SM_", 4) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_smbios_eps)) == 0)
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return (struct grub_smbios_eps *) ptr;
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return 0;
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}
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struct grub_smbios_eps3 *
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grub_machine_smbios_get_eps3 (void)
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{
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grub_uint8_t *ptr;
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grub_dprintf ("smbios", "Looking for SMBIOS3 EPS. Scanning BIOS\n");
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for (ptr = (grub_uint8_t *) 0xf0000; ptr < (grub_uint8_t *) 0x100000; ptr += 16)
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if (grub_memcmp (ptr, "_SM3_", 5) == 0
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&& grub_byte_checksum (ptr, sizeof (struct grub_smbios_eps3)) == 0)
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return (struct grub_smbios_eps3 *) ptr;
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return 0;
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}
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