audk/EmulatorPkg/Library/PeiServicesTablePointerLibMagicPage/PeiServicesTablePointer.c

/** @file
  PEI Services Table Pointer Library.

  Store PEI Services Table pointer via gEmulatorPkgTokenSpaceGuid.PcdPeiServicesTablePage.
  This emulates a platform SRAM. The PI mechaism does not work in the emulator due to
  lack of privledge.

  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
  Portiions copyrigth (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 <PiPei.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Library/DebugLib.h>
#include <Library/EmuMagicPageLib.h>


/**
  Caches a pointer PEI Services Table.

  Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
  in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
  Pre-EFI Initialization Core Interface Specification.

  If PeiServicesTablePointer is NULL, then ASSERT().

  @param    PeiServicesTablePointer   The address of PeiServices pointer.
**/
VOID
EFIAPI
SetPeiServicesTablePointer (
  IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  )
{
  ASSERT (PeiServicesTablePointer != NULL);
  ASSERT (*PeiServicesTablePointer != NULL);
  EMU_MAGIC_PAGE()->PeiServicesTablePointer = PeiServicesTablePointer;
}

/**
  Retrieves the cached value of the PEI Services Table pointer.

  Returns the cached value of the PEI Services Table pointer in a CPU specific manner
  as specified in the CPU binding section of the Platform Initialization Pre-EFI
  Initialization Core Interface Specification.

  If the cached PEI Services Table pointer is NULL, then ASSERT().

  @return  The pointer to PeiServices.

**/
CONST EFI_PEI_SERVICES **
EFIAPI
GetPeiServicesTablePointer (
  VOID
  )
{
  CONST EFI_PEI_SERVICES **PeiServicesTablePointer;

  PeiServicesTablePointer = EMU_MAGIC_PAGE()->PeiServicesTablePointer;
  ASSERT (PeiServicesTablePointer != NULL);
  ASSERT (*PeiServicesTablePointer != NULL);
  return PeiServicesTablePointer;
}

/**
  Perform CPU specific actions required to migrate the PEI Services Table 
  pointer from temporary RAM to permanent RAM.

  For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes 
  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
  For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes 
  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
  For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
  a dedicated CPU register.  This means that there is no memory storage 
  associated with storing the PEI Services Table pointer, so no additional 
  migration actions are required for Itanium or ARM CPUs.

**/
VOID
EFIAPI
MigratePeiServicesTablePointer (
  VOID
  )
{
  //
  //  PEI Services Table pointer is cached in SRAM. No additional 
  //  migration actions are required.
  //
  return;
}