MdePkg/Library/BaseLib/X86GetInterruptState.c

   1 /** @file
   2   IA-32/x64 GetInterruptState()
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15
  16 #include "BaseLibInternals.h"
  17
  18
  19 /**
  20   Retrieves the current CPU interrupt state.
  21
  22   Returns TRUE is interrupts are currently enabled. Otherwise
  23   returns FALSE.
  24
  25   @retval TRUE  CPU interrupts are enabled.
  26   @retval FALSE CPU interrupts are disabled.
  27
  28 **/
  29 BOOLEAN
  30 EFIAPI
  31 GetInterruptState (
  32   VOID
  33   )
  34 {
  35   IA32_EFLAGS32                     EFlags;
  36
  37   EFlags.UintN = AsmReadEflags ();
  38   return (BOOLEAN)(1 == EFlags.Bits.IF);
  39 }
  40
  41