RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429
In Tdx all CPUs "reset" to run on 32-bit protected mode with flat
descriptor (paging disabled). Main32 entry point is added in
UefiCpuPkg/ResetVector/Vtf0/Main.asm so that Main.asm can support
the 32-bit protected mode.
Init32.asm is the 32-bit initialization code. It is a null stub in
UefiCpuPkg. The actual initialization can be implemented in the platform
(OvmfPkg/ResetVector/Ia32/Init32.asm is the example.)
Cc: Eric Dong <eric.d...@intel.com>
Cc: Ray Ni <ray...@intel.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Signed-off-by: Min Xu <min.m...@intel.com>
---
UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm | 13 +++++++++++++
UefiCpuPkg/ResetVector/Vtf0/Main.asm | 14 ++++++++++++++
UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb | 2 +-
3 files changed, 28 insertions(+), 1 deletion(-)
create mode 100644 UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm
b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm
new file mode 100644
index 000000000000..0cdae4a4a84a
--- /dev/null
+++ b/UefiCpuPkg/ResetVector/Vtf0/Ia32/Init32.asm
@@ -0,0 +1,13 @@
+;------------------------------------------------------------------------------
+; @file
+; 32-bit initialization code.
+; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;------------------------------------------------------------------------------
+
+BITS 32
+
+Init32:
+ nop
+ OneTimeCallRet Init32
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Main.asm
b/UefiCpuPkg/ResetVector/Vtf0/Main.asm
index 19d08482f831..4920c6937e1b 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Main.asm
+++ b/UefiCpuPkg/ResetVector/Vtf0/Main.asm
@@ -36,6 +36,20 @@ Main16:
BITS 32
+%ifdef ARCH_X64
+
+ jmp SearchBfv
+
+;
+; Entry point of Main32
+;
+Main32:
+
+ OneTimeCall Init32
+
+%endif
+
+SearchBfv:
;
; Search for the Boot Firmware Volume (BFV)
;
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
b/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
index 493738c79c1c..6493b9863c48 100644
--- a/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
+++ b/UefiCpuPkg/ResetVector/Vtf0/Vtf0.nasmb
@@ -51,7 +51,7 @@
%include "Ia32/SearchForSecEntry.asm"
%ifdef ARCH_X64
-%include "Ia32/Flat32ToFlat64.asm"
+%include "Ia32/Init32.asm"
%include "Ia32/PageTables64.asm"
%endif
--
2.29.2.windows.2
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