MdePkg/Library/BaseCpuLib/Arm/CpuSleep.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; CpuSleep() for ARMv7
   4 ;
   5 ; ARMv6 versions was:
   6 ;    MOV r0,#0
   7 ;    MCR p15,0,r0,c7,c0,4   ;Wait for Interrupt instruction
   8 ;
   9 ; But this is a no-op on ARMv7
  10 ;
  11 ; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
  12 ; Portions copyright (c) 2008 - 2011, Apple Inc. All rights reserved.<BR>
  13 ; This program and the accompanying materials
  14 ; are licensed and made available under the terms and conditions of the BSD License
  15 ; which accompanies this distribution.  The full text of the license may be found at
  16 ; http://opensource.org/licenses/bsd-license.php.
  17 ;
  18 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  19 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  20 ;
  21 ;------------------------------------------------------------------------------
  22
  23   EXPORT CpuSleep
  24   AREA cpu_sleep, CODE, READONLY
  25
  26 ;/**
  27 ;  Places the CPU in a sleep state until an interrupt is received.
  28 ;
  29 ;  Places the CPU in a sleep state until an interrupt is received. If interrupts
  30 ;  are disabled prior to calling this function, then the CPU will be placed in a
  31 ;  sleep state indefinitely.
  32 ;
  33 ;**/
  34 ;VOID
  35 ;EFIAPI
  36 ;CpuSleep (
  37 ;  VOID
  38 ;  );
  39 ;
  40 CpuSleep
  41     WFI
  42     BX LR
  43
  44   END