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   Module Name:  x86GetInterruptState.c
  14
  15 **/
  16
  17 //
  18 // Include common header file for this module.
  19 //
  20 #include "CommonHeader.h"
  21
  22 /**
  23   Retrieves the current CPU interrupt state.
  24
  25   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  26   currently enabled. Otherwise returns FALSE.
  27
  28   @retval TRUE  CPU interrupts are enabled.
  29   @retval FALSE CPU interrupts are disabled.
  30
  31 **/
  32 BOOLEAN
  33 EFIAPI
  34 GetInterruptState (
  35   VOID
  36   )
  37 {
  38   IA32_EFLAGS32                     EFlags;
  39
  40   EFlags.UintN = AsmReadEflags ();
  41   return (BOOLEAN)(EFlags.Bits.IF == 1);
  42 }
  43
  44