mirror of https://github.com/acidanthera/audk.git
112 lines
3.5 KiB
C
112 lines
3.5 KiB
C
/** @file
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A hook-in library for MdeModulePkg/Universal/SmbiosDxe, in order to set
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gEfiMdeModulePkgTokenSpaceGuid.PcdSmbiosVersion (and possibly other PCDs)
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just before SmbiosDxe consumes them.
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Copyright (C) 2013, 2015, Red Hat, Inc.
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Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <IndustryStandard/SmBios.h>
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#include <Base.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/DebugLib.h>
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#include <Library/PcdLib.h>
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#include <Library/QemuFwCfgLib.h>
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typedef union {
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SMBIOS_TABLE_ENTRY_POINT V2;
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SMBIOS_TABLE_3_0_ENTRY_POINT V3;
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} QEMU_SMBIOS_ANCHOR;
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RETURN_STATUS
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EFIAPI
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DetectSmbiosVersion (
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VOID
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)
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{
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FIRMWARE_CONFIG_ITEM Anchor, Tables;
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UINTN AnchorSize, TablesSize;
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QEMU_SMBIOS_ANCHOR QemuAnchor;
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UINT16 SmbiosVersion;
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RETURN_STATUS PcdStatus;
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if (PcdGetBool (PcdQemuSmbiosValidated)) {
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//
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// Some other module, linked against this library, has already performed
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// the task at hand. This should never happen, but it's easy to handle;
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// just exit early.
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//
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return RETURN_SUCCESS;
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}
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if (RETURN_ERROR (QemuFwCfgFindFile (
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"etc/smbios/smbios-anchor", &Anchor, &AnchorSize)) ||
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RETURN_ERROR (QemuFwCfgFindFile (
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"etc/smbios/smbios-tables", &Tables, &TablesSize)) ||
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TablesSize == 0) {
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return RETURN_SUCCESS;
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}
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QemuFwCfgSelectItem (Anchor);
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switch (AnchorSize) {
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case sizeof QemuAnchor.V2:
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QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);
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if (QemuAnchor.V2.MajorVersion != 2 ||
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QemuAnchor.V2.TableLength != TablesSize ||
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CompareMem (QemuAnchor.V2.AnchorString, "_SM_", 4) != 0 ||
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CompareMem (QemuAnchor.V2.IntermediateAnchorString, "_DMI_", 5) != 0) {
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return RETURN_SUCCESS;
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}
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SmbiosVersion = (UINT16)(QemuAnchor.V2.MajorVersion << 8 |
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QemuAnchor.V2.MinorVersion);
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break;
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case sizeof QemuAnchor.V3:
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QemuFwCfgReadBytes (AnchorSize, &QemuAnchor);
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if (QemuAnchor.V3.MajorVersion != 3 ||
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QemuAnchor.V3.TableMaximumSize != TablesSize ||
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CompareMem (QemuAnchor.V3.AnchorString, "_SM3_", 5) != 0) {
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return RETURN_SUCCESS;
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}
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SmbiosVersion = (UINT16)(QemuAnchor.V3.MajorVersion << 8 |
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QemuAnchor.V3.MinorVersion);
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DEBUG ((EFI_D_INFO, "%a: SMBIOS 3.x DocRev from QEMU: 0x%02x\n",
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__FUNCTION__, QemuAnchor.V3.DocRev));
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PcdStatus = PcdSet8S (PcdSmbiosDocRev, QemuAnchor.V3.DocRev);
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ASSERT_RETURN_ERROR (PcdStatus);
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break;
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default:
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return RETURN_SUCCESS;
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}
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DEBUG ((EFI_D_INFO, "%a: SMBIOS version from QEMU: 0x%04x\n", __FUNCTION__,
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SmbiosVersion));
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PcdStatus = PcdSet16S (PcdSmbiosVersion, SmbiosVersion);
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ASSERT_RETURN_ERROR (PcdStatus);
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//
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// SMBIOS platform drivers can now fetch and install
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// "etc/smbios/smbios-tables" from QEMU.
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//
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PcdStatus = PcdSetBoolS (PcdQemuSmbiosValidated, TRUE);
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ASSERT_RETURN_ERROR (PcdStatus);
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return RETURN_SUCCESS;
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}
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