text: /*++
  
  Copyright (c) 2004 - 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:
  
    x86DisablePaging64.c
    
  Abstract: 
  
    IA-32/x64 specific functions.
  
  --*/
  
  #include "BaseLibInternals.h"
  
  /**
    Disables the 64-bit paging mode on the CPU.
  
    Disables the 64-bit paging mode on the CPU and returns to 32-bit protected
    mode. This function assumes the current execution mode is 64-paging mode.
    This function is only available on X64. After the 64-bit paging mode is
    disabled, control is transferred to the function specified by EntryPoint
    using the new stack specified by NewStack and passing in the parameters
    specified by Context1 and Context2. Context1 and Context2 are optional and
    may be 0. The function EntryPoint must never return.
  
    If the current execution mode is not 64-bit paged mode, then ASSERT().
    If EntryPoint is 0, then ASSERT().
    If NewStack is 0, then ASSERT().
  
    @param  Cs          The 16-bit selector to load in the CS before EntryPoint
                        is called. The descriptor in the GDT that this selector
                        references must be setup for 32-bit protected mode.
    @param  EntryPoint  The 64-bit virtual address of the function to call with
                        the new stack after paging is disabled.
    @param  Context1    The 64-bit virtual address of the context to pass into
                        the EntryPoint function as the first parameter after
                        paging is disabled.
    @param  Context2    The 64-bit virtual address of the context to pass into
                        the EntryPoint function as the second parameter after
                        paging is disabled.
    @param  NewStack    The 64-bit virtual address of the new stack to use for
                        the EntryPoint function after paging is disabled.
  
  **/
  VOID
  EFIAPI
  AsmDisablePaging64 (
    IN      UINT16                    Cs,
    IN      UINT32                    EntryPoint,
    IN      UINT32                    Context1,  OPTIONAL
    IN      UINT32                    Context2,  OPTIONAL
    IN      UINT32                    NewStack
    )
  {
    ASSERT (EntryPoint != 0);
    ASSERT (NewStack != 0);
    InternalX86DisablePaging64 (Cs, EntryPoint, Context1, Context2, NewStack);
  }
  