audk/MdePkg/Library/BaseS3StallLib/S3StallLib.c

/** @file
  Stall Services that do stall and also enable the Stall operatation
  to be replayed during an S3 resume. This library class maps directly on top
  of the Timer class.

  Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>

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

**/

#include <Base.h>

#include <Library/TimerLib.h>
#include <Library/DebugLib.h>
#include <Library/S3BootScriptLib.h>
#include <Library/S3StallLib.h>


/**
  Stalls the CPU for at least the given number of microseconds and and saves
  the value in the S3 script to be replayed on S3 resume.

  Stalls the CPU for the number of microseconds specified by MicroSeconds.

  @param  MicroSeconds  The minimum number of microseconds to delay.

  @return MicroSeconds

**/
UINTN
EFIAPI
S3Stall (
  IN UINTN                     MicroSeconds
  )
{
  RETURN_STATUS    Status;

  Status = S3BootScriptSaveStall (MicroSecondDelay (MicroSeconds));
  ASSERT (Status == RETURN_SUCCESS);

  return MicroSeconds;
}