path: root/MdeModulePkg/Core/Pei/Ppi/Ppi.c

/** @file
  EFI PEI Core PPI services
  
Copyright (c) 2006 - 2010, 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"

/**

  Initialize PPI services.

  @param PrivateData     Pointer to the PEI Core data.
  @param OldCoreData     Pointer to old PEI Core data. 
                         NULL if being run in non-permament memory mode.

**/
VOID
InitializePpiServices (
  IN PEI_CORE_INSTANCE *PrivateData,
  IN PEI_CORE_INSTANCE *OldCoreData
  )
{
  if (OldCoreData == NULL) {
    PrivateData->PpiData.NotifyListEnd = FixedPcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
    PrivateData->PpiData.DispatchListEnd = FixedPcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
    PrivateData->PpiData.LastDispatchedNotify = FixedPcdGet32 (PcdPeiCoreMaxPpiSupported)-1;
  }
}

/**

  Migrate the Hob list from the temporary memory stack to PEI installed memory.

  @param PrivateData         Pointer to PeiCore's private data structure.
  @param OldCheckingBottom   Bottom of temporary memory range. All Ppi in this range
                             will be fixup for PpiData and PpiDescriptor pointer.
  @param OldCheckingTop      Top of temporary memory range. All Ppi in this range
                             will be fixup for PpiData and PpiDescriptor.
  @param Fixup               The address difference between
                             the new Hob list and old Hob list.

**/
VOID
ConvertPpiPointers (
  IN PEI_CORE_INSTANCE       *PrivateData,
  IN UINTN                   OldCheckingBottom,
  IN UINTN                   OldCheckingTop,
  IN INTN                    Fixup
  )
{
  UINT8                 Index;
  PEI_PPI_LIST_POINTERS *PpiPointer;

  for (Index = 0; Index < FixedPcdGet32 (PcdPeiCoreMaxPpiSupported); Index++) {
    if (Index < PrivateData->PpiData.PpiListEnd ||
        Index > PrivateData->PpiData.NotifyListEnd) {
      PpiPointer = &PrivateData->PpiData.PpiListPtrs[Index];

      if (((UINTN)PpiPointer->Raw < OldCheckingTop) &&
          ((UINTN)PpiPointer->Raw >= OldCheckingBottom)) {
        //
        // Convert the pointer to the PEIM descriptor from the old HOB heap
        // to the relocated HOB heap.
        //
        PpiPointer->Raw = (VOID *) ((UINTN)PpiPointer->Raw + Fixup);

        //
        // Only when the PEIM descriptor is in the old HOB should it be necessary
        // to try to convert the pointers in the PEIM descriptor
        //

        if (((UINTN)PpiPointer->Ppi->Guid < OldCheckingTop) &&
            ((UINTN)PpiPointer->Ppi->Guid >= OldCheckingBottom)) {
          //
          // Convert the pointer to the GUID in the PPI or NOTIFY descriptor
          // from the old HOB heap to the relocated HOB heap.
          //
          PpiPointer->Ppi->Guid = (VOID *) ((UINTN)PpiPointer->Ppi->Guid + Fixup);
        }

        //
        // Assume that no code is located in the temporary memory, so the pointer to
        // the notification function in the NOTIFY descriptor needs not be converted.
        //
        if (Index < PrivateData->PpiData.PpiListEnd &&
            (UINTN)PpiPointer->Ppi->Ppi < OldCheckingTop &&
            (UINTN)PpiPointer->Ppi->Ppi >= OldCheckingBottom) {
            //
            // Convert the pointer to the PPI interface structure in the PPI descriptor
            // from the old HOB heap to the relocated HOB heap.
            //
            PpiPointer->Ppi->Ppi = (VOID *) ((UINTN)PpiPointer->Ppi->Ppi+ Fixup);
        }
      }
    }
  }
}

/**

  This function installs an interface in the PEI PPI database by GUID. 
  The purpose of the service is to publish an interface that other parties
  can use to call additional PEIMs.

  @param PeiServices                An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param PpiList                    Pointer to a list of PEI PPI Descriptors.

  @retval EFI_SUCCESS              if all PPIs in PpiList are successfully installed.
  @retval EFI_INVALID_PARAMETER    if PpiList is NULL pointer
                                   if any PPI in PpiList is not valid
  @retval EFI_OUT_OF_RESOURCES     if there is no more memory resource to install PPI

**/
EFI_STATUS
EFIAPI
PeiInstallPpi (
  IN CONST EFI_PEI_SERVICES        **PeiServices,
  IN CONST EFI_PEI_PPI_DESCRIPTOR  *PpiList
  )
{
  PEI_CORE_INSTANCE *PrivateData;
  INTN              Index;
  INTN              LastCallbackInstall;


  if (PpiList == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);

  Index = PrivateData->PpiData.PpiListEnd;
  LastCallbackInstall = Index;

  //
  // This is loop installs all PPI descriptors in the PpiList.  It is terminated
  // by the EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST being set in the last
  // EFI_PEI_PPI_DESCRIPTOR in the list.
  //

  for (;;) {
    //
    // Since PpiData is used for NotifyList and PpiList, max resource
    // is reached if the Install reaches the NotifyList
    // PcdPeiCoreMaxPpiSupported can be set to a larger value in DSC to satisfy more PPI requirement.
    //
    if (Index == PrivateData->PpiData.NotifyListEnd + 1) {
      return  EFI_OUT_OF_RESOURCES;
    }
    //
    // Check if it is a valid PPI.
    // If not, rollback list to exclude all in this list.
    // Try to indicate which item failed.
    //
    if ((PpiList->Flags & EFI_PEI_PPI_DESCRIPTOR_PPI) == 0) {
      PrivateData->PpiData.PpiListEnd = LastCallbackInstall;
      DEBUG((EFI_D_ERROR, "ERROR -> InstallPpi: %g %p\n", PpiList->Guid, PpiList->Ppi));
      return  EFI_INVALID_PARAMETER;
    }

    DEBUG((EFI_D_INFO, "Install PPI: %g\n", PpiList->Guid));
    PrivateData->PpiData.PpiListPtrs[Index].Ppi = (EFI_PEI_PPI_DESCRIPTOR*) PpiList;
    PrivateData->PpiData.PpiListEnd++;

    //
    // Continue until the end of the PPI List.
    //
    if ((PpiList->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) ==
        EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
      break;
    }
    PpiList++;
    Index++;
  }

  //
  // Dispatch any callback level notifies for newly installed PPIs.
  //
  DispatchNotify (
    PrivateData,
    EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
    LastCallbackInstall,
    PrivateData->PpiData.PpiListEnd,
    PrivateData->PpiData.DispatchListEnd,
    PrivateData->PpiData.NotifyListEnd
    );


  return EFI_SUCCESS;
}

/**

  This function reinstalls an interface in the PEI PPI database by GUID. 
  The purpose of the service is to publish an interface that other parties can 
  use to replace an interface of the same name in the protocol database with a 
  different interface.

  @param PeiServices            An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param OldPpi                 Pointer to the old PEI PPI Descriptors.
  @param NewPpi                 Pointer to the new PEI PPI Descriptors.

  @retval EFI_SUCCESS           if the operation was successful
  @retval EFI_INVALID_PARAMETER if OldPpi or NewPpi is NULL
  @retval EFI_INVALID_PARAMETER if NewPpi is not valid
  @retval EFI_NOT_FOUND         if the PPI was not in the database

**/
EFI_STATUS
EFIAPI
PeiReInstallPpi (
  IN CONST EFI_PEI_SERVICES        **PeiServices,
  IN CONST EFI_PEI_PPI_DESCRIPTOR  *OldPpi,
  IN CONST EFI_PEI_PPI_DESCRIPTOR  *NewPpi
  )
{
  PEI_CORE_INSTANCE   *PrivateData;
  INTN                Index;


  if ((OldPpi == NULL) || (NewPpi == NULL)) {
    return EFI_INVALID_PARAMETER;
  }

  if ((NewPpi->Flags & EFI_PEI_PPI_DESCRIPTOR_PPI) == 0) {
    return  EFI_INVALID_PARAMETER;
  }

  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);

  //
  // Find the old PPI instance in the database.  If we can not find it,
  // return the EFI_NOT_FOUND error.
  //
  for (Index = 0; Index < PrivateData->PpiData.PpiListEnd; Index++) {
    if (OldPpi == PrivateData->PpiData.PpiListPtrs[Index].Ppi) {
      break;
    }
  }
  if (Index == PrivateData->PpiData.PpiListEnd) {
    return EFI_NOT_FOUND;
  }

  //
  // Remove the old PPI from the database, add the new one.
  //
  DEBUG((EFI_D_INFO, "Reinstall PPI: %g\n", NewPpi->Guid));
  ASSERT (Index < (INTN)(FixedPcdGet32 (PcdPeiCoreMaxPpiSupported)));
  PrivateData->PpiData.PpiListPtrs[Index].Ppi = (EFI_PEI_PPI_DESCRIPTOR *) NewPpi;

  //
  // Dispatch any callback level notifies for the newly installed PPI.
  //
  DispatchNotify (
    PrivateData,
    EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
    Index,
    Index+1,
    PrivateData->PpiData.DispatchListEnd,
    PrivateData->PpiData.NotifyListEnd
    );


  return EFI_SUCCESS;
}

/**

  Locate a given named PPI.


  @param PeiServices        An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param Guid               Pointer to GUID of the PPI.
  @param Instance           Instance Number to discover.
  @param PpiDescriptor      Pointer to reference the found descriptor. If not NULL,
                            returns a pointer to the descriptor (includes flags, etc)
  @param Ppi                Pointer to reference the found PPI

  @retval EFI_SUCCESS   if the PPI is in the database
  @retval EFI_NOT_FOUND if the PPI is not in the database

**/
EFI_STATUS
EFIAPI
PeiLocatePpi (
  IN CONST EFI_PEI_SERVICES        **PeiServices,
  IN CONST EFI_GUID                *Guid,
  IN UINTN                         Instance,
  IN OUT EFI_PEI_PPI_DESCRIPTOR    **PpiDescriptor,
  IN OUT VOID                      **Ppi
  )
{
  PEI_CORE_INSTANCE   *PrivateData;
  INTN                Index;
  EFI_GUID            *CheckGuid;
  EFI_PEI_PPI_DESCRIPTOR  *TempPtr;


  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);

  //
  // Search the data base for the matching instance of the GUIDed PPI.
  //
  for (Index = 0; Index < PrivateData->PpiData.PpiListEnd; Index++) {
    TempPtr = PrivateData->PpiData.PpiListPtrs[Index].Ppi;
    CheckGuid = TempPtr->Guid;

    //
    // Don't use CompareGuid function here for performance reasons.
    // Instead we compare the GUID as INT32 at a time and branch
    // on the first failed comparison.
    //
    if ((((INT32 *)Guid)[0] == ((INT32 *)CheckGuid)[0]) &&
        (((INT32 *)Guid)[1] == ((INT32 *)CheckGuid)[1]) &&
        (((INT32 *)Guid)[2] == ((INT32 *)CheckGuid)[2]) &&
        (((INT32 *)Guid)[3] == ((INT32 *)CheckGuid)[3])) {
      if (Instance == 0) {

        if (PpiDescriptor != NULL) {
          *PpiDescriptor = TempPtr;
        }

        if (Ppi != NULL) {
          *Ppi = TempPtr->Ppi;
        }


        return EFI_SUCCESS;
      }
      Instance--;
    }
  }

  return EFI_NOT_FOUND;
}

/**

  This function installs a notification service to be called back when a given 
  interface is installed or reinstalled. The purpose of the service is to publish 
  an interface that other parties can use to call additional PPIs that may materialize later.

  @param PeiServices        An indirect pointer to the EFI_PEI_SERVICES table published by the PEI Foundation.
  @param NotifyList         Pointer to list of Descriptors to notify upon.

  @retval EFI_SUCCESS           if successful
  @retval EFI_OUT_OF_RESOURCES  if no space in the database
  @retval EFI_INVALID_PARAMETER if not a good decriptor

**/
EFI_STATUS
EFIAPI
PeiNotifyPpi (
  IN CONST EFI_PEI_SERVICES           **PeiServices,
  IN CONST EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyList
  )
{
  PEI_CORE_INSTANCE                *PrivateData;
  INTN                             Index;
  INTN                             NotifyIndex;
  INTN                             LastCallbackNotify;
  EFI_PEI_NOTIFY_DESCRIPTOR        *NotifyPtr;
  UINTN                            NotifyDispatchCount;


  NotifyDispatchCount = 0;

  if (NotifyList == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  PrivateData = PEI_CORE_INSTANCE_FROM_PS_THIS(PeiServices);

  Index = PrivateData->PpiData.NotifyListEnd;
  LastCallbackNotify = Index;

  //
  // This is loop installs all Notify descriptors in the NotifyList.  It is
  // terminated by the EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST being set in the last
  // EFI_PEI_NOTIFY_DESCRIPTOR in the list.
  //

  for (;;) {
    //
    // Since PpiData is used for NotifyList and InstallList, max resource
    // is reached if the Install reaches the PpiList
    // PcdPeiCoreMaxPpiSupported can be set to a larger value in DSC to satisfy more Notify PPIs requirement.
    //
    if (Index == PrivateData->PpiData.PpiListEnd - 1) {
      return  EFI_OUT_OF_RESOURCES;
    }

    //
    // If some of the PPI data is invalid restore original Notify PPI database value
    //
    if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_TYPES) == 0) {
        PrivateData->PpiData.NotifyListEnd = LastCallbackNotify;
        DEBUG((EFI_D_ERROR, "ERROR -> InstallNotify: %g %p\n", NotifyList->Guid, NotifyList->Notify));
      return  EFI_INVALID_PARAMETER;
    }

    if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH) != 0) {
      NotifyDispatchCount ++;
    }

    PrivateData->PpiData.PpiListPtrs[Index].Notify = (EFI_PEI_NOTIFY_DESCRIPTOR *) NotifyList;

    PrivateData->PpiData.NotifyListEnd--;
    DEBUG((EFI_D_INFO, "Register PPI Notify: %g\n", NotifyList->Guid));
    if ((NotifyList->Flags & EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) ==
        EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST) {
      break;
    }
    //
    // Go the next descriptor. Remember the NotifyList moves down.
    //
    NotifyList++;
    Index--;
  }

  //
  // If there is Dispatch Notify PPI installed put them on the bottom
  //
  if (NotifyDispatchCount > 0) {
    for (NotifyIndex = LastCallbackNotify; NotifyIndex > PrivateData->PpiData.NotifyListEnd; NotifyIndex--) {
      if ((PrivateData->PpiData.PpiListPtrs[NotifyIndex].Notify->Flags & EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH) != 0) {
        NotifyPtr = PrivateData->PpiData.PpiListPtrs[NotifyIndex].Notify;

        for (Index = NotifyIndex; Index < PrivateData->PpiData.DispatchListEnd; Index++){
          PrivateData->PpiData.PpiListPtrs[Index].Notify = PrivateData->PpiData.PpiListPtrs[Index + 1].Notify;
        }
        PrivateData->PpiData.PpiListPtrs[Index].Notify = NotifyPtr;
        PrivateData->PpiData.DispatchListEnd--;
      }
    }

    LastCallbackNotify -= NotifyDispatchCount;
  }

  //
  // Dispatch any callback level notifies for all previously installed PPIs.
  //
  DispatchNotify (
    PrivateData,
    EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK,
    0,
    PrivateData->PpiData.PpiListEnd,
    LastCallbackNotify,
    PrivateData->PpiData.NotifyListEnd
    );

  return  EFI_SUCCESS;
}


/**

  Process the Notify List at dispatch level.

  @param PrivateData  PeiCore's private data structure.

**/
VOID
ProcessNotifyList (
  IN PEI_CORE_INSTANCE  *PrivateData
  )
{
  INTN                    TempValue;

  while (TRUE) {
    //
    // Check if the PEIM that was just dispatched resulted in any
    // Notifies getting installed.  If so, go process any dispatch
    // level Notifies that match the previouly installed PPIs.
    // Use "while" instead of "if" since DispatchNotify can modify
    // DispatchListEnd (with NotifyPpi) so we have to iterate until the same.
    //
    while (PrivateData->PpiData.LastDispatchedNotify != PrivateData->PpiData.DispatchListEnd) {
      TempValue = PrivateData->PpiData.DispatchListEnd;
      DispatchNotify (
        PrivateData,
        EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH,
        0,
        PrivateData->PpiData.LastDispatchedInstall,
        PrivateData->PpiData.LastDispatchedNotify,
        PrivateData->PpiData.DispatchListEnd
        );
      PrivateData->PpiData.LastDispatchedNotify = TempValue;
    }


    //
    // Check if the PEIM that was just dispatched resulted in any
    // PPIs getting installed.  If so, go process any dispatch
    // level Notifies that match the installed PPIs.
    // Use "while" instead of "if" since DispatchNotify can modify
    // PpiListEnd (with InstallPpi) so we have to iterate until the same.
    //
    while (PrivateData->PpiData.LastDispatchedInstall != PrivateData->PpiData.PpiListEnd) {
      TempValue = PrivateData->PpiData.PpiListEnd;
      DispatchNotify (
        PrivateData,
        EFI_PEI_PPI_DESCRIPTOR_NOTIFY_DISPATCH,
        PrivateData->PpiData.LastDispatchedInstall,
        PrivateData->PpiData.PpiListEnd,
        FixedPcdGet32 (PcdPeiCoreMaxPpiSupported)-1,
        PrivateData->PpiData.DispatchListEnd
        );
      PrivateData->PpiData.LastDispatchedInstall = TempValue;
    }

    if (PrivateData->PpiData.LastDispatchedNotify == PrivateData->PpiData.DispatchListEnd) {
      break;
    }
  }
  return;
}

/**

  Dispatch notifications.

  @param PrivateData        PeiCore's private data structure
  @param NotifyType         Type of notify to fire.
  @param InstallStartIndex  Install Beginning index.
  @param InstallStopIndex   Install Ending index.
  @param NotifyStartIndex   Notify Beginning index.
  @param NotifyStopIndex    Notify Ending index.

**/
VOID
DispatchNotify (
  IN PEI_CORE_INSTANCE  *PrivateData,
  IN UINTN               NotifyType,
  IN INTN                InstallStartIndex,
  IN INTN                InstallStopIndex,
  IN INTN                NotifyStartIndex,
  IN INTN                NotifyStopIndex
  )
{
  INTN                   Index1;
  INTN                   Index2;
  EFI_GUID                *SearchGuid;
  EFI_GUID                *CheckGuid;
  EFI_PEI_NOTIFY_DESCRIPTOR   *NotifyDescriptor;

  //
  // Remember that Installs moves up and Notifies moves down.
  //
  for (Index1 = NotifyStartIndex; Index1 > NotifyStopIndex; Index1--) {
    NotifyDescriptor = PrivateData->PpiData.PpiListPtrs[Index1].Notify;

    CheckGuid = NotifyDescriptor->Guid;

    for (Index2 = InstallStartIndex; Index2 < InstallStopIndex; Index2++) {
      SearchGuid = PrivateData->PpiData.PpiListPtrs[Index2].Ppi->Guid;
      //
      // Don't use CompareGuid function here for performance reasons.
      // Instead we compare the GUID as INT32 at a time and branch
      // on the first failed comparison.
      //
      if ((((INT32 *)SearchGuid)[0] == ((INT32 *)CheckGuid)[0]) &&
          (((INT32 *)SearchGuid)[1] == ((INT32 *)CheckGuid)[1]) &&
          (((INT32 *)SearchGuid)[2] == ((INT32 *)CheckGuid)[2]) &&
          (((INT32 *)SearchGuid)[3] == ((INT32 *)CheckGuid)[3])) {
        DEBUG ((EFI_D_INFO, "Notify: PPI Guid: %g, Peim notify entry point: %p\n",
          SearchGuid,
          NotifyDescriptor->Notify
          ));
        NotifyDescriptor->Notify (
                            (EFI_PEI_SERVICES **) GetPeiServicesTablePointer (),
                            NotifyDescriptor,
                            (PrivateData->PpiData.PpiListPtrs[Index2].Ppi)->Ppi
                            );
      }
    }
  }
}