mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-30 12:43:41 +01:00
34 lines
786 B
NASM
34 lines
786 B
NASM
;------------------------------------------------------------------------------ ;
|
|
; 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
|
|
|