blob: 9862fd785d5d96e8db6eaf04c1935b9839afa578 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
;------------------------------------------------------------------------------ ;
; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;-------------------------------------------------------------------------------
%include "Nasm.inc"
SECTION .text
global ASM_PFX(DisableCet)
ASM_PFX(DisableCet):
; Skip the pushed data for call
mov eax, 1
INCSSP_EAX
mov eax, cr4
btr eax, 23 ; clear CET
mov cr4, eax
ret
global ASM_PFX(EnableCet)
ASM_PFX(EnableCet):
mov eax, cr4
bts eax, 23 ; set CET
mov cr4, eax
; use jmp to skip the check for ret
pop eax
jmp eax
|