| ;------------------------------------------------------------------------------ ; | |
| ; Copyright (c) 2019 - 2022, 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 | |
| incsspd 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 | |