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https://github.com/CloverHackyColor/CloverBootloader.git
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34 lines
786 B
NASM
34 lines
786 B
NASM
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;------------------------------------------------------------------------------ ;
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; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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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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