mirror of https://github.com/acidanthera/audk.git
40 lines
1.1 KiB
NASM
40 lines
1.1 KiB
NASM
;------------------------------------------------------------------------------ ;
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; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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;-------------------------------------------------------------------------------
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%include "Nasm.inc"
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SECTION .text
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global ASM_PFX(DisableCet)
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ASM_PFX(DisableCet):
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; Skip the pushed data for call
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mov eax, 1
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INCSSP_EAX
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mov eax, cr4
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btr eax, 23 ; clear CET
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mov cr4, eax
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ret
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global ASM_PFX(EnableCet)
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ASM_PFX(EnableCet):
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mov eax, cr4
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bts eax, 23 ; set CET
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mov cr4, eax
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; use jmp to skip the check for ret
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pop eax
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jmp eax
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