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 /**
  13   Disables CPU interrupts and returns the interrupt state prior to the disable
  14   operation.
  15
  16   @retval TRUE  CPU interrupts were enabled on entry to this call.
  17   @retval FALSE CPU interrupts were disabled on entry to this call.
  18
  19 **/
  20 BOOLEAN
  21 EFIAPI
  22 SaveAndDisableInterrupts (
  23   VOID
  24   )
  25 {
  26   BOOLEAN                           InterruptState;
  27
  28   InterruptState = GetInterruptState ();
  29   DisableInterrupts ();
  30   return InterruptState;
  31 }
  32
  33 /**
  34   Set the current CPU interrupt state.
  35
  36   Sets the current CPU interrupt state to the state specified by
  37   InterruptState. If InterruptState is TRUE, then interrupts are enabled. If
  38   InterruptState is FALSE, then interrupts are disabled. InterruptState is
  39   returned.
  40
  41   @param  InterruptState  TRUE if interrupts should be enabled. FALSE if
  42                           interrupts should be disabled.
  43
  44   @return InterruptState
  45
  46 **/
  47 BOOLEAN
  48 EFIAPI
  49 SetInterruptState (
  50   IN      BOOLEAN                   InterruptState
  51   )
  52 {
  53   if (InterruptState) {
  54     EnableInterrupts ();
  55   } else {
  56     DisableInterrupts ();
  57   }
  58   return InterruptState;
  59 }