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

/** @file
  AsmReadTsc function

  Copyright (c) 2006 - 2008, Intel Corporation<BR>
  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.

**/




/**
  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
  }
}