MdePkg/Library/BaseLib/AArch64/SwitchStack.asm

;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
; Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
; Portions copyright (c) 2011 - 2013, ARM Limited. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------

  EXPORT InternalSwitchStackAsm
  EXPORT CpuPause
  AREA BaseLib_LowLevel, CODE, READONLY

;/**
;
;  This allows the caller to switch the stack and goes to the new entry point
;
; @param      EntryPoint   The pointer to the location to enter
; @param      Context      Parameter to pass in
; @param      Context2     Parameter2 to pass in
; @param      NewStack     New Location of the stack
;
; @return     Nothing. Goes to the Entry Point passing in the new parameters
;
;**/
;VOID
;EFIAPI
;InternalSwitchStackAsm (
;  SWITCH_STACK_ENTRY_POINT EntryPoint,
;  VOID  *Context,
;  VOID  *Context2,
;  VOID  *NewStack
;  );
;
InternalSwitchStackAsm
    mov   x29, #0
    mov   x30, x0
    mov   sp, x3
    mov   x0, x1
    mov   x1, x2
    ret

;/**
;
;  Requests CPU to pause for a short period of time.
;
;  Requests CPU to pause for a short period of time. Typically used in MP
;  systems to prevent memory starvation while waiting for a spin lock.
;
;**/
;VOID
;EFIAPI
;CpuPause (
;  VOID
;  )
;
CpuPause
    nop
    nop
    nop
    nop
    nop
    ret

  END