MdePkg/Library/BaseCpuLib/Ia32/CpuSleepGcc.c

   1 /** @file
   2   CpuSleep function for Ia32/X64 GCC.
   3
   4   Copyright (c) 2006 - 2008, Intel Corporation<BR>
   5   Portions copyright (c) 2008-2009 Apple Inc.<BR>
   6   All rights reserved. This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16
  17 /**
  18   Places the CPU in a sleep state until an interrupt is received.
  19
  20   Places the CPU in a sleep state until an interrupt is received. If interrupts
  21   are disabled prior to calling this function, then the CPU will be placed in a
  22   sleep state indefinitely.
  23
  24 **/
  25 VOID
  26 EFIAPI
  27 CpuSleep (
  28   VOID
  29   )
  30 {
  31   __asm__ __volatile__ ("hlt"::: "memory");
  32 }
  33