MdePkg/Library/BaseLib/Cpu.c

   1 /** @file
   2   Base Library CPU Functions for all architectures.
   3
   4   Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "BaseLibInternals.h"
  10
  11 /**
  12   Disables CPU interrupts and returns the interrupt state prior to the disable
  13   operation.
  14
  15   @retval TRUE  CPU interrupts were enabled on entry to this call.
  16   @retval FALSE CPU interrupts were disabled on entry to this call.
  17
  18 **/
  19 BOOLEAN
  20 EFIAPI
  21 SaveAndDisableInterrupts (
  22   VOID
  23   )
  24 {
  25   BOOLEAN  InterruptState;
  26
  27   InterruptState = GetInterruptState ();
  28   DisableInterrupts ();
  29   return InterruptState;
  30 }
  31
  32 /**
  33   Set the current CPU interrupt state.
  34
  35   Sets the current CPU interrupt state to the state specified by
  36   InterruptState. If InterruptState is TRUE, then interrupts are enabled. If
  37   InterruptState is FALSE, then interrupts are disabled. InterruptState is
  38   returned.
  39
  40   @param  InterruptState  TRUE if interrupts should be enabled. FALSE if
  41                           interrupts should be disabled.
  42
  43   @return InterruptState
  44
  45 **/
  46 BOOLEAN
  47 EFIAPI
  48 SetInterruptState (
  49   IN      BOOLEAN  InterruptState
  50   )
  51 {
  52   if (InterruptState) {
  53     EnableInterrupts ();
  54   } else {
  55     DisableInterrupts ();
  56   }
  57
  58   return InterruptState;
  59 }