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| ;------------------------------------------------------------------------------ ;
| ; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
| ; SPDX-License-Identifier: BSD-2-Clause-Patent
| ;
| ;-------------------------------------------------------------------------------
|
| %include "Nasm.inc"
|
| DEFAULT REL
| SECTION .text
|
| global ASM_PFX(DisableCet)
| ASM_PFX(DisableCet):
|
| ; Skip the pushed data for call
| mov rax, 1
| INCSSP_RAX
|
| mov rax, cr4
| btr eax, 23 ; clear CET
| mov cr4, rax
| ret
|
| global ASM_PFX(EnableCet)
| ASM_PFX(EnableCet):
|
| mov rax, cr4
| bts eax, 23 ; set CET
| mov cr4, rax
|
| ; use jmp to skip the check for ret
| pop rax
| jmp rax
|
|
|
