MdePkg/Library/BaseCpuLib/Ia32/CpuSleepGcc.c

   1 /** @file
   2   CpuSleep function for Ia32/X64 GCC.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
   5   Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 /**
  11   Places the CPU in a sleep state until an interrupt is received.
  12
  13   Places the CPU in a sleep state until an interrupt is received. If interrupts
  14   are disabled prior to calling this function, then the CPU will be placed in a
  15   sleep state indefinitely.
  16
  17 **/
  18 VOID
  19 EFIAPI
  20 CpuSleep (
  21   VOID
  22   )
  23 {
  24   __asm__ __volatile__ ("hlt"::: "memory");
  25 }