/** @file
  Library to install StallPpi.

  Copyright (c) 2019 Intel Corporation. All rights reserved. <BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent
**/

#include <Ppi/Stall.h>
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/TimerLib.h>
#include <Library/PeiServicesLib.h>

#define PEI_STALL_RESOLUTION   1

/**
  This function provides a blocking stall for reset at least the given number of microseconds
  stipulated in the final argument.

  @param  PeiServices General purpose services available to every PEIM.
  @param  this Pointer to the local data for the interface.
  @param  Microseconds number of microseconds for which to stall.

  @retval  EFI_SUCCESS the function provided at least the required stall.
**/
EFI_STATUS
EFIAPI
Stall (
  IN CONST EFI_PEI_SERVICES   **PeiServices,
  IN CONST EFI_PEI_STALL_PPI  *This,
  IN UINTN                    Microseconds
  );


EFI_PEI_STALL_PPI   mStallPpi = {
  PEI_STALL_RESOLUTION,
  Stall
};

EFI_PEI_PPI_DESCRIPTOR    mPeiInstallStallPpi = {
  (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),
  &gEfiPeiStallPpiGuid,
  &mStallPpi
};

EFI_STATUS
EFIAPI
Stall (
  IN CONST EFI_PEI_SERVICES   **PeiServices,
  IN CONST EFI_PEI_STALL_PPI  *This,
  IN UINTN                    Microseconds
  )
{
  MicroSecondDelay (Microseconds);
  return EFI_SUCCESS;
}

/**
  This function will install the StallPpi.

  @retval EFI_SUCCESS if StallPpi is installed successfully.
**/
EFI_STATUS
EFIAPI
InstallStallPpi (
  VOID
  )
{
  EFI_STATUS   Status;

  DEBUG((DEBUG_INFO, "Installing StallPpi \n"));

  Status = PeiServicesInstallPpi (&mPeiInstallStallPpi);
  ASSERT_EFI_ERROR (Status);

  return Status;
}