[edk2-devel] [PATCH V2 3/4] UefiCpuPkg/ResetVector: Add Main32 entry point in Main.asm
Yao, Jiewen
jiewen.yao at intel.com
Sun Jul 25 06:07:45 UTC 2021
Current OvmfPkg Reser vector is a mess (see my previous email).
I also compared the ResetVector code in UefiCpuPkg and OvmfPkg. There are already duplication/override.
I suggest we just drop UefiCpuPkg change, and focus on improving OvmfPkg.
If we need add something in UefiCpuPkg, let's copy the file to OvmfPkg and update there.
I really don't want to mess up UefiCpuPkg at this moment.
We can make a better architecture to share reset vector in virtual BIOS and physical BIOS later. But at this moment, let's finish the virtual BIOS architecture at first.
Thank you
Yao Jiewen
> -----Original Message-----
> From: Xu, Min M <min.m.xu at intel.com>
> Sent: Thursday, July 22, 2021 1:52 PM
> To: devel at edk2.groups.io
> Cc: Xu, Min M <min.m.xu at intel.com>; Dong, Eric <eric.dong at intel.com>; Ni,
> Ray <ray.ni at intel.com>; Yao, Jiewen <jiewen.yao at intel.com>
> Subject: [PATCH V2 3/4] UefiCpuPkg/ResetVector: Add Main32 entry point in
> Main.asm
>
> 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.dong at intel.com>
> Cc: Ray Ni <ray.ni at intel.com>
> Cc: Jiewen Yao <jiewen.yao at intel.com>
> Signed-off-by: Min Xu <min.m.xu at 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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