diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm')
| -rw-r--r-- | roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm b/roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm new file mode 100644 index 000000000..0919d6d05 --- /dev/null +++ b/roms/edk2/UefiCpuPkg/PiSmmCpuDxeSmm/Ia32/Cet.nasm @@ -0,0 +1,33 @@ +;------------------------------------------------------------------------------ ;
+; Copyright (c) 2019, 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
+ INCSSP_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
+
|