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diff --git a/OldMdePkg/Include/Ppi/Stall.h b/OldMdePkg/Include/Ppi/Stall.h
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+++ b/OldMdePkg/Include/Ppi/Stall.h
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+/** @file
+  This file declares Stall PPI.
+
+  This code abstracts the PEI core to provide Stall services.
+
+  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:  Stall.h
+
+  @par Revision Reference:
+  This PPI is defined in PEI CIS.
+  Version 0.91.
+
+**/
+
+#ifndef __STALL_PPI_H__
+#define __STALL_PPI_H__
+
+#define EFI_PEI_STALL_PPI_GUID \
+  { \
+    0x1f4c6f90, 0xb06b, 0x48d8, {0xa2, 0x01, 0xba, 0xe5, 0xf1, 0xcd, 0x7d, 0x56 } \
+  }
+
+typedef struct _EFI_PEI_STALL_PPI EFI_PEI_STALL_PPI;
+
+/**
+  The Stall() function provides a blocking stall for at least the number 
+  of microseconds stipulated in the final argument of the API.
+
+  @param  PeiServices    An indirect pointer to the PEI Services Table
+                         published by the PEI Foundation.
+  @param  This           Pointer to the local data for the interface.
+  @param  Microseconds   Number of microseconds for which to stall.
+
+  @retval EFI_SUCCESS           The service provided at least the required delay.
+
+**/
+typedef
+EFI_STATUS
+(EFIAPI *EFI_PEI_STALL) (
+  IN EFI_PEI_SERVICES           **PeiServices,
+  IN EFI_PEI_STALL_PPI          *This,
+  IN UINTN                      Microseconds
+  );
+
+/**
+  @par Ppi Description:
+  This service provides a simple, blocking stall with platform-specific resolution. 
+
+  @param Resolution
+  The resolution in microseconds of the stall services.
+
+  @param Stall
+  The actual stall procedure call. 
+
+**/
+struct _EFI_PEI_STALL_PPI {
+  UINTN          Resolution;
+  EFI_PEI_STALL  Stall;
+};
+
+extern EFI_GUID gEfiPeiStallPpiGuid;
+
+#endif