;------------------------------------------------------------------------------ | |
; | |
; 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 |