2 files changed, 123 insertions, 0 deletions
diff --git a/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c b/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c
new file mode 100644
index 000000000..3247114d0
--- /dev/null
+++ b/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c
@@ -0,0 +1,82 @@
+/*++ @file
+
+Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+Portions copyright (c) 2011, Apple Inc. All rights reserved.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiDxe.h>
+
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/EmuThunkLib.h>
+#include <Library/BaseMemoryLib.h>
+
+EMU_THUNK_PROTOCOL   *gEmuThunk = NULL;
+
+
+/**
+  The constructor function caches the pointer of EMU Thunk protocol.
+
+  @param  ImageHandle   The firmware allocated handle for the EFI image.
+  @param  SystemTable   A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeEmuLibConstructor (
+  IN EFI_HANDLE        ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_HOB_GUID_TYPE        *GuidHob;
+
+  GuidHob = GetFirstGuidHob (&gEmuThunkProtocolGuid);
+  ASSERT (GuidHob != NULL);
+
+  gEmuThunk = (EMU_THUNK_PROTOCOL *)(*(UINTN *)(GET_GUID_HOB_DATA (GuidHob)));
+  ASSERT (gEmuThunk != NULL);
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Serach the EMU IO Thunk database for a matching EMU IO Thunk
+  Protocol instance.
+
+  @param  Protocol   Protocol to search for.
+  @param  Instance   Instance of protocol to search for.
+
+  @retval NULL       Protocol and Instance not found.
+  @retval other      EMU IO Thunk protocol that matched.
+
+**/
+EMU_IO_THUNK_PROTOCOL *
+EFIAPI
+GetIoThunkInstance (
+  IN  EFI_GUID  *Protocol,
+  IN  UINTN     Instance
+  )
+{
+  EFI_STATUS              Status;
+  EMU_IO_THUNK_PROTOCOL   *EmuIoThunk;
+
+  for (Status = EFI_SUCCESS, EmuIoThunk = NULL; !EFI_ERROR (Status); ) {
+    Status = gEmuThunk->GetNextProtocol (FALSE, &EmuIoThunk);
+    if (EFI_ERROR (Status)) {
+      break;
+    }
+
+    if (EmuIoThunk->Instance == Instance) {
+      if (CompareGuid (EmuIoThunk->Protocol, Protocol)) {
+        return EmuIoThunk;
+      }
+    }
+  }
+
+  return NULL;
+}
diff --git a/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.inf b/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.inf
new file mode 100644
index 000000000..0031011d8
--- /dev/null
+++ b/roms/edk2/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.inf
@@ -0,0 +1,41 @@
+## @file
+# A library to produce the global variable 'gEmuThunk'
+#
+# This library contains a single global variable 'gEmuThunk' along with a constructor to
+# initialize that global.
+# Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+# Portions copyright (c) 2011, Apple Inc. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = DxeEmuLib
+  FILE_GUID                      = 31479AFD-B06F-4E4A-863B-A8F7E7710778
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = EmuThunkLib
+
+  CONSTRUCTOR                    = DxeEmuLibConstructor
+
+
+[Sources]
+  DxeEmuLib.c
+
+
+[Packages]
+  MdePkg/MdePkg.dec
+  EmulatorPkg/EmulatorPkg.dec
+
+[LibraryClasses]
+  HobLib
+  DebugLib
+  BaseMemoryLib
+
+
+[Protocols]
+  gEmuThunkProtocolGuid                     # PROTOCOL ALWAYS_CONSUMED
+