system76-edk2/IntelFsp2Pkg/FspNotifyPhase/FspNotifyPhasePeim.c

/** @file
  Source file for FSP notify phase PEI module

  Copyright (c) 2016 - 2018, Intel Corporation. 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 "FspNotifyPhasePeim.h"

/**

   This function waits for FSP notify.

   @param This          Entry point for DXE IPL PPI.
   @param PeiServices   General purpose services available to every PEIM.
   @param HobList       Address to the Pei HOB list.

   @return EFI_SUCCESS              This function never returns.

**/
EFI_STATUS
EFIAPI
WaitForNotify (
  IN CONST EFI_DXE_IPL_PPI *This,
  IN EFI_PEI_SERVICES      **PeiServices,
  IN EFI_PEI_HOB_POINTERS  HobList
  );

CONST EFI_DXE_IPL_PPI mDxeIplPpi = {
  WaitForNotify
};

CONST EFI_PEI_PPI_DESCRIPTOR mInstallDxeIplPpi = {
  EFI_PEI_PPI_DESCRIPTOR_PPI,
  &gEfiDxeIplPpiGuid,
  (VOID *) &mDxeIplPpi
};

CONST EFI_PEI_PPI_DESCRIPTOR gEndOfPeiSignalPpi = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gEfiEndOfPeiSignalPpiGuid,
  NULL
};

CONST EFI_PEI_PPI_DESCRIPTOR gFspReadyForNotifyPhasePpi = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gFspReadyForNotifyPhasePpiGuid,
  NULL
};

/**

   This function waits for FSP notify.

   @param This          Entry point for DXE IPL PPI.
   @param PeiServices   General purpose services available to every PEIM.
   @param HobList       Address to the Pei HOB list.

   @return EFI_SUCCESS              This function never returns.

**/
EFI_STATUS
EFIAPI
WaitForNotify (
  IN CONST EFI_DXE_IPL_PPI *This,
  IN EFI_PEI_SERVICES      **PeiServices,
  IN EFI_PEI_HOB_POINTERS  HobList
  )
{
  EFI_STATUS   Status;

  DEBUG ((DEBUG_INFO | DEBUG_INIT, "FSP HOB is located at 0x%08X\n", HobList));

  //
  // End of PEI phase signal
  //
  Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  ASSERT_EFI_ERROR (Status);

  //
  // Give control back to BootLoader after FspSiliconInit
  //
  DEBUG ((DEBUG_INFO | DEBUG_INIT, "FSP is waiting for NOTIFY\n"));
  FspSiliconInitDone2 (EFI_SUCCESS);

  //
  // BootLoader called FSP again through NotifyPhase
  //
  FspWaitForNotify ();

  if (GetFspGlobalDataPointer ()->FspMode == FSP_IN_API_MODE) {
    //
    // Should not come here
    //
    while (TRUE) {
      DEBUG ((DEBUG_ERROR, "No FSP API should be called after FSP is DONE!\n"));
      SetFspApiReturnStatus (EFI_UNSUPPORTED);
      Pei2LoaderSwitchStack ();
    }
  }

  return EFI_SUCCESS;
}

/**
  FSP notify phase PEI module entry point

  @param[in]  FileHandle           Not used.
  @param[in]  PeiServices          General purpose services available to every PEIM.

  @retval     EFI_SUCCESS          The function completes successfully
  @retval     EFI_OUT_OF_RESOURCES Insufficient resources to create database
**/
EFI_STATUS
FspNotifyPhasePeimEntryPoint (
  IN       EFI_PEI_FILE_HANDLE    FileHandle,
  IN CONST EFI_PEI_SERVICES       **PeiServices
  )
{
  EFI_STATUS                      Status;
  VOID                            *OldDxeIplPpi;
  EFI_PEI_PPI_DESCRIPTOR          *OldDescriptor;

  DEBUG ((DEBUG_INFO | DEBUG_INIT, "The entry of FspNotificationPeim\n"));

  if (GetFspGlobalDataPointer ()->FspMode == FSP_IN_API_MODE) {
    //
    // Locate old DXE IPL PPI
    //
    Status = PeiServicesLocatePpi (
              &gEfiDxeIplPpiGuid,
              0,
              &OldDescriptor,
              &OldDxeIplPpi
              );
    ASSERT_EFI_ERROR (Status);

    //
    // Re-install the DXE IPL PPI to wait for notify
    //
    Status = PeiServicesReInstallPpi (OldDescriptor, &mInstallDxeIplPpi);
    ASSERT_EFI_ERROR (Status);
  } else {
    Status = PeiServicesInstallPpi (&gFspReadyForNotifyPhasePpi);
    ASSERT_EFI_ERROR (Status);
  }

  return EFI_SUCCESS;
}