[PATCH 3/6] UefiCpuPkg/ResetVector: Add InitTdx in UefiCpuPkg

["Min Xu" <min.m.xu@intel.com>]

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

In ResetVector phase some Tdx initialization may be needed, for example,
recording the Tdx flag ('TDXG'), CPU GPA width, etc. It will be called by
the Main32 entry point in Main.asm. InitTdx.asm in UefiCpuPkg/ResetVector
is a placeholder and the actual initialization is done in other Pkg, such
as OvmfPkg.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 UefiCpuPkg/ResetVector/Vtf0/Ia32/InitTdx.asm | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
 create mode 100644 UefiCpuPkg/ResetVector/Vtf0/Ia32/InitTdx.asm

diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/InitTdx.asm b/UefiCpuPkg/ResetVector/Vtf0/Ia32/InitTdx.asm
new file mode 100644
index 000000000000..feb917779fbd
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/InitTdx.asm
@@ -0,0 +1,15 @@
+;------------------------------------------------------------------------------
+; @file
+;   Tdx Initialization.
+;
+; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+BITS 32
+
+InitTdx:
+    nop
+doneTdxInit:
+    OneTimeCallRet InitTdx
-- 
2.29.2.windows.2