MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointer.c

/** @file
  PEI Services Table Pointer Library for IA-32 and x64.

  According to PI specification, the peiservice pointer is stored prior at IDT
  table in IA32 and x64 architecture.
  
  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
  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/BaseLib.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.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
  )
{
  CONST EFI_PEI_SERVICES  **PeiServices;
  IA32_DESCRIPTOR   Idtr;
  
  AsmReadIdtr (&Idtr);
  PeiServices = (CONST EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - sizeof (UINTN)));
  ASSERT (PeiServices != NULL);
  return PeiServices;
}

/**
  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. 
  The function set the pointer of PEI services immediately preceding the IDT table
  according to PI specification.
  
  If PeiServicesTablePointer is NULL, then ASSERT().
  
  @param    PeiServicesTablePointer   The address of PeiServices pointer.
**/
VOID
EFIAPI
SetPeiServicesTablePointer (
  IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
  )
{
  IA32_DESCRIPTOR        Idtr;
  
  ASSERT (PeiServicesTablePointer != NULL);
  AsmReadIdtr (&Idtr);
  (*(UINTN*)(Idtr.Base - sizeof (UINTN))) = (UINTN)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.

  If The cached PEI Services Table pointer is NULL, then ASSERT().
  If the permanent memory is allocated failed, then ASSERT().
**/
VOID
EFIAPI
MigratePeiServicesTablePointer (
  VOID
  )
{
  EFI_STATUS             Status;
  IA32_DESCRIPTOR        Idtr;
  EFI_PHYSICAL_ADDRESS   IdtBase;
  CONST EFI_PEI_SERVICES  **PeiServices;

  //
  // Get PEI Services Table pointer
  //
  AsmReadIdtr (&Idtr);
  PeiServices = (CONST EFI_PEI_SERVICES **) (*(UINTN*)(Idtr.Base - sizeof (UINTN)));
  ASSERT (PeiServices != NULL);
  //
  // Allocate the permanent memory.
  //
  Status = (*PeiServices)->AllocatePages (
                            PeiServices, 
                            EfiBootServicesCode,
                            EFI_SIZE_TO_PAGES(Idtr.Limit + 1 + sizeof (UINTN)),
                            &IdtBase
                            );
  ASSERT_EFI_ERROR (Status);
  //
  // Idt table needs to be migrated into memory.
  //
  CopyMem ((VOID *) (UINTN) IdtBase, (VOID *) (Idtr.Base - sizeof (UINTN)), Idtr.Limit + 1 + sizeof (UINTN));
  Idtr.Base = (UINTN) IdtBase + sizeof (UINTN);
  AsmWriteIdtr (&Idtr);
  
  return;
}