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 <BaseLibInternals.h>
  21
  22
  23 /**
  24   Retrieves the current CPU interrupt state.
  25
  26   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  27   currently enabled. Otherwise returns FALSE.
  28
  29   @retval TRUE  CPU interrupts are enabled.
  30   @retval FALSE CPU interrupts are disabled.
  31
  32 **/
  33 BOOLEAN
  34 EFIAPI
  35 GetInterruptState (
  36   VOID
  37   )
  38 {
  39   IA32_EFLAGS32                     EFlags;
  40
  41   EFlags.UintN = AsmReadEflags ();
  42   return (BOOLEAN)(EFlags.Bits.IF == 1);
  43 }
  44
  45