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Last change
on this file since 89983 was 80721, checked in by vboxsync, 5 years ago |
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Devices/EFI/FirmwareNew: Start upgrade process to edk2-stable201908 (compiles on Windows and works to some extent), bugref:4643
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Property svn:eol-style
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native
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File size:
765 bytes
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| 1 | ;------------------------------------------------------------------------------ ;
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| 2 | ; Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
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| 3 | ; SPDX-License-Identifier: BSD-2-Clause-Patent
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| 4 | ;
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| 5 | ;-------------------------------------------------------------------------------
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| 6 |
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| 7 | %include "Nasm.inc"
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| 8 |
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| 9 | DEFAULT REL
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| 10 | SECTION .text
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| 11 |
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| 12 | global ASM_PFX(DisableCet)
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| 13 | ASM_PFX(DisableCet):
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| 14 |
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| 15 | ; Skip the pushed data for call
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| 16 | mov rax, 1
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| 17 | INCSSP_RAX
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| 18 |
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| 19 | mov rax, cr4
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| 20 | btr eax, 23 ; clear CET
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| 21 | mov cr4, rax
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| 22 | ret
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| 23 |
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| 24 | global ASM_PFX(EnableCet)
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| 25 | ASM_PFX(EnableCet):
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| 26 |
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| 27 | mov rax, cr4
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| 28 | bts eax, 23 ; set CET
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| 29 | mov cr4, rax
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| 30 |
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| 31 | ; use jmp to skip the check for ret
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| 32 | pop rax
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| 33 | jmp rax
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| 34 |
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