1 files changed, 76 insertions, 0 deletions
diff --git a/OvmfPkg/Library/SmbiosVersionLib/DetectSmbiosVersionLib.c b/OvmfPkg/Library/SmbiosVersionLib/DetectSmbiosVersionLib.c
new file mode 100644
index 000000000..0efe020ee
--- /dev/null
+++ b/OvmfPkg/Library/SmbiosVersionLib/DetectSmbiosVersionLib.c
@@ -0,0 +1,76 @@
+/** @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;
+}