MdePkg/Library/BaseCpuLib/Arm/CpuSleep.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # CpuSleep() for ARM
   4 #
   5 # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
   6 # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   7 # This program and the accompanying materials
   8 # are licensed and made available under the terms and conditions of the BSD License
   9 # which accompanies this distribution.  The full text of the license may be found at
  10 # http://opensource.org/licenses/bsd-license.php
  11 #
  12 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 #
  15 #------------------------------------------------------------------------------
  16
  17 .text
  18 .p2align 2
  19 .globl ASM_PFX(CpuSleep)
  20
  21 #/**
  22 #  Places the CPU in a sleep state until an interrupt is received.
  23 #
  24 #  Places the CPU in a sleep state until an interrupt is received. If interrupts
  25 #  are disabled prior to calling this function, then the CPU will be placed in a
  26 #  sleep state indefinitely.
  27 #
  28 #**/
  29 #VOID
  30 #EFIAPI
  31 #CpuSleep (
  32 #  VOID
  33 #  );
  34 #
  35 ASM_PFX(CpuSleep):
  36     mov r0,#0
  37     mcr p15,0,r0,c7,c0,4   // Wait for Interrupt instruction
  38     bx  lr