OvmfPkg: Create global entry point for SMBIOS parsing

Move the generic entry point part out of Qemu.c to anticipate the
addition of new ways of retrieving the SMBIOS table.

Reviewed-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

OvmfPkg/SmbiosPlatformDxe/EntryPoint.c

@@ -0,0 +1,42 @@
+/** @file
+  Find and extract SMBIOS data.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Library/MemoryAllocationLib.h> // FreePool()
+
+#include "SmbiosPlatformDxe.h"
+
+/**
+  Installs SMBIOS information for OVMF
+
+  @param ImageHandle     Module's image handle
+  @param SystemTable     Pointer of EFI_SYSTEM_TABLE
+
+  @retval EFI_SUCCESS    Smbios data successfully installed
+  @retval Other          Smbios data was not installed
+
+**/
+EFI_STATUS
+EFIAPI
+SmbiosTablePublishEntry (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+  UINT8       *SmbiosTables;
+
+  Status = EFI_NOT_FOUND;
+  //
+  // Add QEMU SMBIOS data if found
+  //
+  SmbiosTables = GetQemuSmbiosTables ();
+  if (SmbiosTables != NULL) {
+    Status = InstallAllStructures (SmbiosTables);
+    FreePool (SmbiosTables);
+  }
+
+  return Status;
+}