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diff --git a/UnixPkg/Include/Ppi/UnixAutoScan.h b/UnixPkg/Include/Ppi/UnixAutoScan.h
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+++ b/UnixPkg/Include/Ppi/UnixAutoScan.h
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+/*++
+
+Copyright (c) 2006, Intel Corporation                                                         
+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.             
+
+Module Name:
+
+  UnixAutoscan.h
+
+Abstract:
+
+Unix Autoscan PPI
+
+--*/
+
+#ifndef __UNIX_PEI_AUTOSCAN_H__
+#define __UNIX_PEI_AUTOSCAN_H__
+
+#include <UnixDxe.h>
+
+#define PEI_UNIX_AUTOSCAN_PPI_GUID \
+  { \
+    0xf2ed3d14, 0x8985, 0x11db, {0xb0, 0x57, 0x00, 0x40, 0xd0, 0x2b, 0x18, 0x35 } \
+  }
+
+typedef
+EFI_STATUS
+(EFIAPI *PEI_UNIX_AUTOSCAN) (
+  IN  UINTN                 Index,
+  OUT EFI_PHYSICAL_ADDRESS  *MemoryBase,
+  OUT UINT64                *MemorySize
+  );
+
+/*++
+
+Routine Description:
+  This service is called from Index == 0 until it returns EFI_UNSUPPORTED.
+  It allows discontiguous memory regions to be supported by the emulator.
+  It uses gSystemMemory[] and gSystemMemoryCount that were created by
+  parsing the host environment variable EFI_MEMORY_SIZE.
+  The size comes from the varaible and the address comes from the call to
+  WinNtOpenFile. 
+
+Arguments:
+  Index      - Which memory region to use
+  MemoryBase - Return Base address of memory region
+  MemorySize - Return size in bytes of the memory region
+
+Returns:
+  EFI_SUCCESS - If memory region was mapped
+  EFI_UNSUPPORTED - If Index is not supported
+
+--*/
+typedef struct {
+  PEI_UNIX_AUTOSCAN UnixAutoScan;
+} PEI_UNIX_AUTOSCAN_PPI;
+
+extern EFI_GUID gPeiUnixAutoScanPpiGuid;
+
+#endif