MdePkg/Include/Library/PeiServicesTablePointerLib.h

/** @file
  Provides a service to retrieve a pointer to the PEI Services Table.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __PEI_SERVICES_TABLE_POINTER_LIB_H__
#define __PEI_SERVICES_TABLE_POINTER_LIB_H__

/**
  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
  );

/**
  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
  );

/**
  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
  );

#endif