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OvmfPkg: SmbiosVersionLib: add "plugin" for detecting SMBIOS version 

Introduce a minimal library instance for fetching and validating the
SMBIOS entry point structure exposed by QEMU over fw_cfg. This library is
meant to be hooked into MdeModulePkg/Universal/SmbiosDxe by platform DSC
files, so that the library can set the PCD(s) that SmbiosDxe consumes at
the right moment.

At the moment only SMBIOS 2.x entry points are recognized.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Wei Huang <wei@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gabriel L. Somlo <somlo@cmu.edu>
Suggested-by: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18174 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek 2015-08-06 10:13:37 +00:00 committed by lersek
parent 3d8ac52a5d
commit b265ed9284
2 changed files with 127 additions and 0 deletions
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76
OvmfPkg/Library/SmbiosVersionLib/DetectSmbiosVersionLib.c Normal file
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/** @file
A hook-in library for MdeModulePkg/Universal/SmbiosDxe, in order to set
gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion (and possibly other PCDs)
just before SmbiosDxe consumes them.
Copyright (C) 2013, 2015, Red Hat, Inc.
Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials are licensed and made available
under the terms and conditions of the BSD License which accompanies this
distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <IndustryStandard/SmBios.h>
#include <Base.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/QemuFwCfgLib.h>
typedef union {
SMBIOS_TABLE_ENTRY_POINT V2;
} QEMU_SMBIOS_ANCHOR;
RETURN_STATUS
EFIAPI
DetectSmbiosVersion (
VOID
)
{
FIRMWARE_CONFIG_ITEM Anchor, Tables;
UINTN AnchorSize, TablesSize;
QEMU_SMBIOS_ANCHOR QemuAnchor;
UINT16 SmbiosVersion;
if (RETURN_ERROR (QemuFwCfgFindFile (
"etc/smbios/smbios-anchor", &Anchor, &AnchorSize)) ||
RETURN_ERROR (QemuFwCfgFindFile (
"etc/smbios/smbios-tables", &Tables, &TablesSize)) ||
TablesSize == 0) {
return RETURN_SUCCESS;
}
QemuFwCfgSelectItem (Anchor);
switch (AnchorSize) {
case sizeof QemuAnchor.V2:
QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);
if (QemuAnchor.V2.MajorVersion != 2 ||
QemuAnchor.V2.TableLength != TablesSize ||
CompareMem (QemuAnchor.V2.AnchorString, "_SM_", 4) != 0 ||
CompareMem (QemuAnchor.V2.IntermediateAnchorString, "_DMI_", 5) != 0) {
return RETURN_SUCCESS;
}
SmbiosVersion = (UINT16)(QemuAnchor.V2.MajorVersion << 8 |
QemuAnchor.V2.MinorVersion);
break;
default:
return RETURN_SUCCESS;
}
DEBUG ((EFI_D_INFO, "%a: SMBIOS version from QEMU: 0x%04x\n", __FUNCTION__,
SmbiosVersion));
PcdSet16 (PcdSmbiosVersion, SmbiosVersion);
return RETURN_SUCCESS;
}

51
OvmfPkg/Library/SmbiosVersionLib/DetectSmbiosVersionLib.inf Normal file
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## @file
#
# A hook-in library for MdeModulePkg/Universal/SmbiosDxe, in order to set
# gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion (and possibly other PCDs)
# just before SmbiosDxe consumes them.
#
# Copyright (C) 2013, 2015, Red Hat, Inc.
# Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
#
# This program and the accompanying materials are licensed and made available
# under the terms and conditions of the BSD License which accompanies this
# distribution. The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
# WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
##
[Defines]
INF_VERSION = 0x00010005
BASE_NAME = DetectSmbiosVersionLib
FILE_GUID = 6c633bb2-ae33-49ae-9f89-b5aa999fe3ae
MODULE_TYPE = BASE
VERSION_STRING = 1.0
LIBRARY_CLASS = SmbiosVersionLib|DXE_DRIVER
CONSTRUCTOR = DetectSmbiosVersion
#
# The following information is for reference only and not required by the build
# tools.
#
# VALID_ARCHITECTURES = IA32 X64 ARM AARCH64
#
[Sources]
DetectSmbiosVersionLib.c
[Packages]
MdePkg/MdePkg.dec
MdeModulePkg/MdeModulePkg.dec
OvmfPkg/OvmfPkg.dec
[LibraryClasses]
BaseMemoryLib
DebugLib
PcdLib
QemuFwCfgLib
[Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion