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