1 files changed, 88 insertions, 0 deletions
diff --git a/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c b/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c
new file mode 100644
index 0000000000..2e42ea6151
--- /dev/null
+++ b/EmulatorPkg/Library/DxeEmuLib/DxeEmuLib.c
@@ -0,0 +1,88 @@
+/*++ @file
+
+Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
+Portions copyright (c) 2011, Apple Inc. All rights reserved. 
+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 <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;
+}
+\ No newline at end of file