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   Retrieves the current CPU interrupt state.
  19
  20   Retrieves the current CPU interrupt state. Returns TRUE is interrupts are
  21   currently enabled. Otherwise returns FALSE.
  22
  23   @retval TRUE  CPU interrupts are enabled.
  24   @retval FALSE CPU interrupts are disabled.
  25
  26 **/
  27 BOOLEAN
  28 EFIAPI
  29 GetInterruptState (
  30   VOID
  31   )
  32 {
  33   IA32_EFLAGS32                     EFlags;
  34
  35   EFlags.UintN = AsmReadEflags ();
  36   return (BOOLEAN)(EFlags.Bits.IF == 1);
  37 }
  38
  39