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ec661594 PB |
1 | #------------------------------------------------------------------------------\r |
2 | #\r | |
3 | # Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r | |
4 | # Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
5 | # Portions copyright (c) 2011 - 2013, ARM Limited. All rights reserved.<BR>\r | |
9344f092 | 6 | # SPDX-License-Identifier: BSD-2-Clause-Patent\r |
ec661594 PB |
7 | #\r |
8 | #------------------------------------------------------------------------------\r | |
807e2604 HL |
9 | \r |
10 | .text\r | |
11 | .align 5\r | |
12 | \r | |
0f895683 OM |
13 | GCC_ASM_EXPORT(InternalSwitchStackAsm)\r |
14 | GCC_ASM_EXPORT(CpuPause)\r | |
807e2604 | 15 | \r |
ec661594 PB |
16 | #/**\r |
17 | #\r | |
18 | # This allows the caller to switch the stack and goes to the new entry point\r | |
19 | #\r | |
20 | # @param EntryPoint The pointer to the location to enter\r | |
21 | # @param Context Parameter to pass in\r | |
22 | # @param Context2 Parameter2 to pass in\r | |
23 | # @param NewStack New Location of the stack\r | |
24 | #\r | |
25 | # @return Nothing. Goes to the Entry Point passing in the new parameters\r | |
26 | #\r | |
27 | #**/\r | |
28 | #VOID\r | |
29 | #EFIAPI\r | |
30 | #InternalSwitchStackAsm (\r | |
31 | # SWITCH_STACK_ENTRY_POINT EntryPoint,\r | |
32 | # VOID *Context,\r | |
33 | # VOID *Context2,\r | |
34 | # VOID *NewStack\r | |
35 | # );\r | |
36 | #\r | |
807e2604 | 37 | ASM_PFX(InternalSwitchStackAsm):\r |
35071e15 | 38 | mov x29, #0\r |
807e2604 HL |
39 | mov x30, x0\r |
40 | mov sp, x3\r | |
41 | mov x0, x1\r | |
42 | mov x1, x2\r | |
43 | ret\r | |
44 | \r | |
ec661594 PB |
45 | #/**\r |
46 | #\r | |
47 | # Requests CPU to pause for a short period of time.\r | |
48 | #\r | |
49 | # Requests CPU to pause for a short period of time. Typically used in MP\r | |
50 | # systems to prevent memory starvation while waiting for a spin lock.\r | |
51 | #\r | |
52 | #**/\r | |
53 | #VOID\r | |
54 | #EFIAPI\r | |
55 | #CpuPause (\r | |
56 | # VOID\r | |
57 | # )\r | |
58 | #\r | |
807e2604 HL |
59 | ASM_PFX(CpuPause):\r |
60 | nop\r | |
61 | nop\r | |
62 | nop\r | |
63 | nop\r | |
64 | nop\r | |
65 | ret\r |