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diff --git a/Silicon/Intel/PurleySktPkg/Include/Protocol/PciCallback.h b/Silicon/Intel/PurleySktPkg/Include/Protocol/PciCallback.h
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index 0000000000..9b8bfecc45
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+++ b/Silicon/Intel/PurleySktPkg/Include/Protocol/PciCallback.h
@@ -0,0 +1,90 @@
+/** @file
+
+Copyright (c) 2018, 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 that 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.
+
+**/
+
+#ifndef _EFI_PCI_CALLBACK_H
+#define _EFI_PCI_CALLBACK_H
+
+#include <Include/IndustryStandard/Pci22.h>
+#include <Protocol/CpuIo2.h>
+#include <Protocol/PciRootBridgeIo.h>
+
+
+//
+// Global Id for PCI callback
+//
+#define EFI_PCI_CALLBACK_PROTOCOL_GUID \
+  { \
+    0x1ca0e202, 0xfe9e, 0x4776, 0x9f, 0xaa, 0x57, 0xc, 0x19, 0x61, 0x7a, 0x06 \
+  }  
+
+typedef struct _EFI_PCI_CALLBACK_PROTOCOL EFI_PCI_CALLBACK_PROTOCOL;
+
+typedef enum {  
+  EfiPciEnumerationDeviceScanning    = 1,
+  EfiPciEnumerationBusNumberAssigned = 2,
+  EfiPciEnumerationResourceAssigned  = 4,
+} EFI_PCI_ENUMERATION_PHASE;
+
+typedef struct {  
+  PCI_TYPE00                              PciHeader;
+  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL        *PciRootBridgeIo;  
+  EFI_CPU_IO2_PROTOCOL                    *CpuIo;
+} EFI_PCI_CALLBACK_CONTEXT;
+
+typedef
+VOID
+(EFIAPI *EFI_PCI_CALLBACK_FUNC) (
+  IN  EFI_HANDLE                                   RootBridgeHandle,
+  IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS  PciAddress,
+  IN  EFI_PCI_ENUMERATION_PHASE                    Phase,
+  IN  EFI_PCI_CALLBACK_CONTEXT                     *Context
+);
+                  
+typedef
+EFI_STATUS
+(EFIAPI *EFI_REGISTER_PCI_CALLBACK) (
+  IN  EFI_PCI_CALLBACK_PROTOCOL                   *This,
+  IN  EFI_PCI_CALLBACK_FUNC                        Function,
+  IN  EFI_PCI_ENUMERATION_PHASE                    Phase
+)
+/*++
+
+Routine Description:
+
+  Register a callback during PCI bus enumeration
+
+Arguments:
+
+  This       -  Protocol instance pointer.
+  Function   -  Callback function pointer.
+  Phase      -  PCI enumeration phase.
+
+Returns:
+
+  EFI_SUCCESS           - Function has registed successfully
+  EFI_UNSUPPORTED       - The function has been regisered
+  EFI_InVALID_PARAMETER - The parameter is incorrect
+
+--*/
+;
+
+//
+// Protocol definition
+//
+typedef struct _EFI_PCI_CALLBACK_PROTOCOL {
+  EFI_REGISTER_PCI_CALLBACK   RegisterPciCallback;  
+} EFI_PCI_CALLBACK_PROTOCOL;
+
+extern EFI_GUID gEfiPciCallbackProtocolGuid;
+
+#endif