1//------------------------------------------------------------------------------
2//
3// Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
4// Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
5// Portions copyright (c) 2011 - 2013, ARM Limited. All rights reserved.<BR>
6// This program and the accompanying materials
7// are licensed and made available under the terms and conditions of the BSD License
8// which accompanies this distribution.  The full text of the license may be found at
9// http://opensource.org/licenses/bsd-license.php.
10//
11// THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12// WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13//
14//------------------------------------------------------------------------------
15
16.text
17.align 5
18
19GCC_ASM_EXPORT(InternalSwitchStackAsm)
20GCC_ASM_EXPORT(CpuPause)
21
22/**
23//
24//  This allows the caller to switch the stack and goes to the new entry point
25//
26// @param      EntryPoint   The pointer to the location to enter
27// @param      Context      Parameter to pass in
28// @param      Context2     Parameter2 to pass in
29// @param      NewStack     New Location of the stack
30//
31// @return     Nothing. Goes to the Entry Point passing in the new parameters
32//
33VOID
34EFIAPI
35InternalSwitchStackAsm (
36  SWITCH_STACK_ENTRY_POINT EntryPoint,
37  VOID  *Context,
38  VOID  *Context2,
39  VOID  *NewStack
40  );
41**/
42ASM_PFX(InternalSwitchStackAsm):
43    mov   x30, x0
44    mov   sp, x3
45    mov   x0, x1
46    mov   x1, x2
47    ret
48
49/**
50//
51//  Requests CPU to pause for a short period of time.
52//
53//  Requests CPU to pause for a short period of time. Typically used in MP
54//  systems to prevent memory starvation while waiting for a spin lock.
55//
56VOID
57EFIAPI
58CpuPause (
59  VOID
60  )
61**/
62ASM_PFX(CpuPause):
63    nop
64    nop
65    nop
66    nop
67    nop
68    ret
69