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 ; SPDX-License-Identifier: BSD-2-Clause-Patent
  14 ;
  15 ;------------------------------------------------------------------------------
  16
  17   EXPORT CpuSleep
  18   AREA cpu_sleep, CODE, READONLY
  19
  20 ;/**
  21 ;  Places the CPU in a sleep state until an interrupt is received.
  22 ;
  23 ;  Places the CPU in a sleep state until an interrupt is received. If interrupts
  24 ;  are disabled prior to calling this function, then the CPU will be placed in a
  25 ;  sleep state indefinitely.
  26 ;
  27 ;**/
  28 ;VOID
  29 ;EFIAPI
  30 ;CpuSleep (
  31 ;  VOID
  32 ;  );
  33 ;
  34 CpuSleep
  35     WFI
  36     BX LR
  37
  38   END