edk2/MdePkg/Library/BaseLib/Ia32/ReadTsc.c

/** @file
  AsmReadTsc function

  Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

/**
  Reads the current value of Time Stamp Counter (TSC).

  Reads and returns the current value of TSC. This function is only available
  on IA-32 and x64.

  @return The current value of TSC

**/
UINT64
EFIAPI
AsmReadTsc (
  VOID
  )
{
  _asm {
    rdtsc
  }
}