/** @file
  Pei Core Main Entry Point
  
Copyright (c) 2006 - 2011, 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 "PeiMain.h"

EFI_PEI_PPI_DESCRIPTOR mMemoryDiscoveredPpi = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gEfiPeiMemoryDiscoveredPpiGuid,
  NULL
};

///
/// Pei service instance
///
EFI_PEI_SERVICES  gPs = {
  {
    PEI_SERVICES_SIGNATURE,
    PEI_SERVICES_REVISION,
    sizeof (EFI_PEI_SERVICES),
    0,
    0
  },
  PeiInstallPpi,
  PeiReInstallPpi,
  PeiLocatePpi,
  PeiNotifyPpi,

  PeiGetBootMode,
  PeiSetBootMode,

  PeiGetHobList,
  PeiCreateHob,

  PeiFfsFindNextVolume,
  PeiFfsFindNextFile,
  PeiFfsFindSectionData,

  PeiInstallPeiMemory,      
  PeiAllocatePages,
  PeiAllocatePool,
  (EFI_PEI_COPY_MEM)CopyMem,
  (EFI_PEI_SET_MEM)SetMem,

  PeiReportStatusCode,
  PeiResetSystem,

  &gPeiDefaultCpuIoPpi,
  &gPeiDefaultPciCfg2Ppi,

  PeiFfsFindFileByName,
  PeiFfsGetFileInfo,
  PeiFfsGetVolumeInfo,
  PeiRegisterForShadow
};

/**
  Shadow PeiCore module from flash to installed memory.
  
  @param PrivateData    PeiCore's private data structure

  @return PeiCore function address after shadowing.
**/
PEICORE_FUNCTION_POINTER
ShadowPeiCore (
  IN PEI_CORE_INSTANCE  *PrivateData
  )
{
  EFI_PEI_FILE_HANDLE  PeiCoreFileHandle;
  EFI_PHYSICAL_ADDRESS EntryPoint;
  EFI_STATUS           Status;
  UINT32               AuthenticationState;

  PeiCoreFileHandle = NULL;

  //
  // Find the PEI Core in the BFV
  //
  Status = PrivateData->Fv[0].FvPpi->FindFileByType (
                                       PrivateData->Fv[0].FvPpi,
                                       EFI_FV_FILETYPE_PEI_CORE,
                                       PrivateData->Fv[0].FvHandle,
                                       &PeiCoreFileHandle
                                       );
  ASSERT_EFI_ERROR (Status);

  //
  // Shadow PEI Core into memory so it will run faster
  //
  Status = PeiLoadImage (
              GetPeiServicesTablePointer (),
              *((EFI_PEI_FILE_HANDLE*)&PeiCoreFileHandle),
              PEIM_STATE_REGISITER_FOR_SHADOW,
              &EntryPoint,
              &AuthenticationState
              );
  ASSERT_EFI_ERROR (Status);

  //
  // Compute the PeiCore's function address after shaowed PeiCore.
  // _ModuleEntryPoint is PeiCore main function entry
  //
  return (PEICORE_FUNCTION_POINTER)((UINTN) EntryPoint + (UINTN) PeiCore - (UINTN) _ModuleEntryPoint);
}

/**
  This routine is invoked by main entry of PeiMain module during transition
  from SEC to PEI. After switching stack in the PEI core, it will restart
  with the old core data.

  @param SecCoreData     Points to a data structure containing information about the PEI core's operating
                         environment, such as the size and location of temporary RAM, the stack location and
                         the BFV location.
  @param PpiList         Points to a list of one or more PPI descriptors to be installed initially by the PEI core.
                         An empty PPI list consists of a single descriptor with the end-tag
                         EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST. As part of its initialization
                         phase, the PEI Foundation will add these SEC-hosted PPIs to its PPI database such
                         that both the PEI Foundation and any modules can leverage the associated service
                         calls and/or code in these early PPIs
  @param Data            Pointer to old core data that is used to initialize the
                         core's data areas.
                         If NULL, it is first PeiCore entering.

**/
VOID
EFIAPI
PeiCore (
  IN CONST EFI_SEC_PEI_HAND_OFF        *SecCoreData,
  IN CONST EFI_PEI_PPI_DESCRIPTOR      *PpiList,
  IN VOID                              *Data
  )
{
  PEI_CORE_INSTANCE           PrivateData;
  EFI_STATUS                  Status;
  PEI_CORE_TEMP_POINTERS      TempPtr;
  PEI_CORE_INSTANCE           *OldCoreData;
  EFI_PEI_CPU_IO_PPI          *CpuIo;
  EFI_PEI_PCI_CFG2_PPI        *PciCfg;
  EFI_HOB_HANDOFF_INFO_TABLE  *HandoffInformationTable;

  //
  // Retrieve context passed into PEI Core
  //
  OldCoreData = (PEI_CORE_INSTANCE *)Data;

  //
  // Perform PEI Core phase specific actions.
  //
  if (OldCoreData == NULL) {
    //
    // If OldCoreData is NULL, means current is the first entry into the PEI Core before memory is available.
    //
    ZeroMem (&PrivateData, sizeof (PEI_CORE_INSTANCE));
    PrivateData.Signature = PEI_CORE_HANDLE_SIGNATURE;
    CopyMem (&PrivateData.ServiceTableShadow, &gPs, sizeof (gPs));
  } else {
    //
    // Memory is available to the PEI Core.  See if the PEI Core has been shadowed to memory yet.
    //
    if (OldCoreData->ShadowedPeiCore == NULL) {
      //
      // Fixup the PeiCore's private data
      //
      OldCoreData->Ps    = &OldCoreData->ServiceTableShadow;
      OldCoreData->CpuIo = &OldCoreData->ServiceTableShadow.CpuIo;
      if (OldCoreData->HeapOffsetPositive) {
        OldCoreData->HobList.Raw = (VOID *)(OldCoreData->HobList.Raw + OldCoreData->HeapOffset);
      } else {
        OldCoreData->HobList.Raw = (VOID *)(OldCoreData->HobList.Raw - OldCoreData->HeapOffset);
      }

      //
      // Initialize libraries that the PEI Core is linked against
      //
      ProcessLibraryConstructorList (NULL, (CONST EFI_PEI_SERVICES **)&OldCoreData->Ps);
      
      //
      // Fixup for PeiService's address
      //
      SetPeiServicesTablePointer ((CONST EFI_PEI_SERVICES **)&OldCoreData->Ps);

      //
      // Update HandOffHob for new installed permenent memory
      //
      HandoffInformationTable = OldCoreData->HobList.HandoffInformationTable;
      if (OldCoreData->HeapOffsetPositive) {
        HandoffInformationTable->EfiEndOfHobList   = HandoffInformationTable->EfiEndOfHobList + OldCoreData->HeapOffset;
      } else {
        HandoffInformationTable->EfiEndOfHobList   = HandoffInformationTable->EfiEndOfHobList - OldCoreData->HeapOffset;
      }
      HandoffInformationTable->EfiMemoryTop        = OldCoreData->PhysicalMemoryBegin + OldCoreData->PhysicalMemoryLength;
      HandoffInformationTable->EfiMemoryBottom     = OldCoreData->PhysicalMemoryBegin;
      HandoffInformationTable->EfiFreeMemoryTop    = OldCoreData->FreePhysicalMemoryTop;
      HandoffInformationTable->EfiFreeMemoryBottom = HandoffInformationTable->EfiEndOfHobList + sizeof (EFI_HOB_GENERIC_HEADER);

      //
      // We need convert the PPI descriptor's pointer
      //
      ConvertPpiPointers (SecCoreData, OldCoreData);

      //
      // After the whole temporary memory is migrated, then we can allocate page in
      // permenent memory.
      //
      OldCoreData->PeiMemoryInstalled = TRUE;

      //
      // Indicate that PeiCore reenter
      //
      OldCoreData->PeimDispatcherReenter = TRUE;
      
      if (PcdGet64(PcdLoadModuleAtFixAddressEnable) != 0 && (OldCoreData->HobList.HandoffInformationTable->BootMode != BOOT_ON_S3_RESUME)) {
        //
        // if Loading Module at Fixed Address is enabled, allocate the PEI code memory range usage bit map array.
        // Every bit in the array indicate the status of the corresponding memory page available or not
        //
        OldCoreData->PeiCodeMemoryRangeUsageBitMap = AllocateZeroPool (((PcdGet32(PcdLoadFixAddressPeiCodePageNumber)>>6) + 1)*sizeof(UINT64));
      }

      //
      // Shadow PEI Core. When permanent memory is avaiable, shadow
      // PEI Core and PEIMs to get high performance.
      //
      OldCoreData->ShadowedPeiCore = ShadowPeiCore (OldCoreData);
      
      //
      // PEI Core has now been shadowed to memory.  Restart PEI Core in memory.
      //
      OldCoreData->ShadowedPeiCore (SecCoreData, PpiList, OldCoreData);
      
      //
      // Should never reach here.
      //
      ASSERT (FALSE);
      CpuDeadLoop();
    }

    //
    // Memory is available to the PEI Core and the PEI Core has been shadowed to memory.
    //
    
    CopyMem (&PrivateData, OldCoreData, sizeof (PrivateData));
    
    CpuIo = (VOID*)PrivateData.ServiceTableShadow.CpuIo;
    PciCfg = (VOID*)PrivateData.ServiceTableShadow.PciCfg;
    
    CopyMem (&PrivateData.ServiceTableShadow, &gPs, sizeof (gPs));
    
    PrivateData.ServiceTableShadow.CpuIo  = CpuIo;
    PrivateData.ServiceTableShadow.PciCfg = PciCfg;
  }
  
  //
  // Cache a pointer to the PEI Services Table that is either in temporary memory or permanent memory
  //
  PrivateData.Ps = &PrivateData.ServiceTableShadow;

  //
  // Initialize libraries that the PEI Core is linked against
  //
  ProcessLibraryConstructorList (NULL, (CONST EFI_PEI_SERVICES **)&PrivateData.Ps);

  //
  // Save PeiServicePointer so that it can be retrieved anywhere.
  //
  SetPeiServicesTablePointer ((CONST EFI_PEI_SERVICES **)&PrivateData.Ps);

  //
  // Initialize PEI Core Services
  //  
  InitializeMemoryServices   (&PrivateData,    SecCoreData, OldCoreData);
  InitializePpiServices      (&PrivateData,    OldCoreData);
  
  //
  // Update performance measurements 
  //
  if (OldCoreData == NULL) {
    PERF_START (NULL, "SEC", NULL, 1);
    PERF_END   (NULL, "SEC", NULL, 0);

    //
    // If first pass, start performance measurement.
    //
    PERF_START (NULL,"PEI",    NULL, 0);
    PERF_START (NULL,"PreMem", NULL, 0);

  } else {
    PERF_END   (NULL,"PreMem",  NULL, 0);
    PERF_START (NULL,"PostMem", NULL, 0);
  }

  //
  // Complete PEI Core Service initialization
  //  
  InitializeSecurityServices (&PrivateData.Ps, OldCoreData);
  InitializeDispatcherData   (&PrivateData,    OldCoreData, SecCoreData);
  InitializeImageServices    (&PrivateData,    OldCoreData);

  //
  // Perform PEI Core Phase specific actions
  //  
  if (OldCoreData == NULL) {
    //
    // Report Status Code EFI_SW_PC_INIT
    //
    REPORT_STATUS_CODE (
      EFI_PROGRESS_CODE,
      (EFI_SOFTWARE_PEI_CORE | EFI_SW_PC_INIT)
      );
      
    //
    // If SEC provided any PPI services to PEI, install them.
    //
    if (PpiList != NULL) {
      Status = PeiServicesInstallPpi (PpiList);
      ASSERT_EFI_ERROR (Status);
    }
  } else {
    //
    // Alert any listeners that there is permanent memory available
    //
    PERF_START (NULL,"DisMem", NULL, 0);
    Status = PeiServicesInstallPpi (&mMemoryDiscoveredPpi);

    //
    // Process the Notify list and dispatch any notifies for the Memory Discovered PPI
    //
    ProcessNotifyList (&PrivateData);

    PERF_END (NULL,"DisMem", NULL, 0);
  }

  //
  // Call PEIM dispatcher
  //
  PeiDispatcher (SecCoreData, &PrivateData);

  //
  // Check if InstallPeiMemory service was called.
  //
  ASSERT(PrivateData.PeiMemoryInstalled == TRUE);

  //
  // Measure PEI Core execution time.
  //
  PERF_END (NULL, "PostMem", NULL, 0);

  //
  // Lookup DXE IPL PPI
  //
  Status = PeiServicesLocatePpi (
             &gEfiDxeIplPpiGuid,
             0,
             NULL,
             (VOID **)&TempPtr.DxeIpl
             );
  ASSERT_EFI_ERROR (Status);

  //
  // Enter DxeIpl to load Dxe core.
  //
  DEBUG ((EFI_D_INFO, "DXE IPL Entry\n"));
  Status = TempPtr.DxeIpl->Entry (
                             TempPtr.DxeIpl,
                             &PrivateData.Ps,
                             PrivateData.HobList
                             );
  //
  // Should never reach here.
  //
  ASSERT_EFI_ERROR (Status);
  CpuDeadLoop();
}
