Re: [edk2-devel] [PATCH v1] MdePkg: Support Extended Control Register(XCR) Read and Write.

["Yao, Jiewen" <jiewen.yao@intel.com>]

Agree with Liming.

For IA32, you get parameter from stack - 
    mov     edx, [esp + 12]
    mov     eax, [esp + 8]
    mov     ecx, [esp + 4]

For X64, you get parameter from GP register - RCX, RDX, R8, R9 for the first 4 parameter. They are on the stack since the 5th parameter.

The code may be sharable only if they do not have any input parameter. But not in this case.

Even though, I still recommend we have two copy - like AsmReadCs() in 2 ReadCs.nasm, because we need different context definition, such as "DEFAULT REL"

Thank you
Yao Jiewen


> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of gaoliming
> Sent: Wednesday, March 31, 2021 10:05 AM
> To: devel@edk2.groups.io; Wu, Jiaxin <jiaxin.wu@intel.com>
> Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Liu, Zhiguang
> <zhiguang.liu@intel.com>; Zhang, Hongbin1 <hongbin1.zhang@intel.com>
> Subject: 回复: [edk2-devel] [PATCH v1] MdePkg: Support Extended Control
> Register(XCR) Read and Write.
> 
> Jiaxin:
>   32bit function and 64bit function have the different calling convention.
> Their assembly function can't be shared.
> 
>   This new API interface is same to AsmWriteMsr64(). You can refer
> AsmWriteMsr64() implementation in BaseLib.
> 
> Thanks
> Liming
> > -----邮件原件-----
> > 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Wu, Jiaxin
> > 发送时间: 2021年3月31日 9:56
> > 收件人: devel@edk2.groups.io; gaoliming@byosoft.com.cn
> > 抄送: Kinney, Michael D <michael.d.kinney@intel.com>; Liu, Zhiguang
> > <zhiguang.liu@intel.com>; Zhang, Hongbin1 <hongbin1.zhang@intel.com>
> > 主题: Re: [edk2-devel] [PATCH v1] MdePkg: Support Extended Control
> > Register(XCR) Read and Write.
> >
> > Actually, the implementation under ia32 should be also workable for X64, I
> > just put it under ia32.
> >
> > Liming, do you have suggestion where can we place the code?
> >
> > Thanks,
> > Jiaxin
> >
> > > -----Original Message-----
> > > From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of
> > gaoliming
> > > Sent: Wednesday, March 31, 2021 9:51 AM
> > > To: devel@edk2.groups.io; Wu, Jiaxin <jiaxin.wu@intel.com>
> > > Cc: Kinney, Michael D <michael.d.kinney@intel.com>; Liu, Zhiguang
> > > <zhiguang.liu@intel.com>; Zhang, Hongbin1 <hongbin1.zhang@intel.com>
> > > Subject: 回复: [edk2-devel] [PATCH v1] MdePkg: Support Extended Control
> > > Register(XCR) Read and Write.
> > >
> > > Where is X64 implementation for this new API?
> > >
> > > > -----邮件原件-----
> > > > 发件人: devel@edk2.groups.io <devel@edk2.groups.io> 代表 Wu,
> > Jiaxin
> > > > 发送时间: 2021年3月31日 9:20
> > > > 收件人: devel@edk2.groups.io
> > > > 抄送: Michael D Kinney <michael.d.kinney@intel.com>; Liming Gao
> > > > <gaoliming@byosoft.com.cn>; Zhiguang Liu <zhiguang.liu@intel.com>;
> > Zhang
> > > > Hongbin1 <hongbin1.zhang@intel.com>
> > > > 主题: [edk2-devel] [PATCH v1] MdePkg: Support Extended Control
> > > > Register(XCR) Read and Write.
> > > >
> > > > https://bugzilla.tianocore.org/show_bug.cgi?id=3284
> > > >
> > > > This patch is to support Extended Control Register(XCR) Read
> > > > and Write.
> > > >
> > > > Cc: Michael D Kinney <michael.d.kinney@intel.com>
> > > > Cc: Liming Gao <gaoliming@byosoft.com.cn>
> > > > Cc: Zhiguang Liu <zhiguang.liu@intel.com>
> > > > Signed-off-by: Zhang Hongbin1 <hongbin1.zhang@intel.com>
> > > > Signed-off-by: Jiaxin Wu <Jiaxin.wu@intel.com>
> > > > ---
> > > >  MdePkg/Include/Library/BaseLib.h          | 46
> > > > ++++++++++++++++++++++++++++++-
> > > >  MdePkg/Library/BaseLib/BaseLib.inf        |  4 ++-
> > > >  MdePkg/Library/BaseLib/Ia32/ReadXcr.nasm  | 31
> > > > +++++++++++++++++++++
> > > >  MdePkg/Library/BaseLib/Ia32/WriteXcr.nasm | 34
> > > > +++++++++++++++++++++++
> > > >  4 files changed, 113 insertions(+), 2 deletions(-)
> > > >  create mode 100644 MdePkg/Library/BaseLib/Ia32/ReadXcr.nasm
> > > >  create mode 100644 MdePkg/Library/BaseLib/Ia32/WriteXcr.nasm
> > > >
> > > > diff --git a/MdePkg/Include/Library/BaseLib.h
> > > > b/MdePkg/Include/Library/BaseLib.h
> > > > index 1171a0ffb5..c51633ad73 100644
> > > > --- a/MdePkg/Include/Library/BaseLib.h
> > > > +++ b/MdePkg/Include/Library/BaseLib.h
> > > > @@ -1,10 +1,10 @@
> > > >  /** @file
> > > >    Provides string functions, linked list functions, math functions,
> > > > synchronization
> > > >    functions, file path functions, and CPU architecture-specific
> > > functions.
> > > >
> > > > -Copyright (c) 2006 - 2019, Intel Corporation. All rights
> reserved.<BR>
> > > > +Copyright (c) 2006 - 2021, Intel Corporation. All rights
> reserved.<BR>
> > > >  Portions copyright (c) 2008 - 2009, Apple Inc. All rights
> reserved.<BR>
> > > >  Copyright (c) Microsoft Corporation.<BR>
> > > >  Portions Copyright (c) 2020, Hewlett Packard Enterprise Development
> > LP.
> > > All
> > > > rights reserved.<BR>
> > > >
> > > >  SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > @@ -7493,7 +7493,51 @@ PatchInstructionX86 (
> > > >    OUT X86_ASSEMBLY_PATCH_LABEL *InstructionEnd,
> > > >    IN  UINT64                   PatchValue,
> > > >    IN  UINTN                    ValueSize
> > > >    );
> > > >
> > > > +/**
> > > > +  Returns a 64-bit Extended Control Register(XCR).
> > > > +
> > > > +  Reads and returns the 64-bit XCR specified by Index. No parameter
> > > > checking is
> > > > +  performed on Index, and some Index values may cause CPU
> > exceptions.
> > > > The
> > > > +  caller must either guarantee that Index is valid, or the caller
> must
> > > set up
> > > > +  exception handlers to catch the exceptions. This function is only
> > > available
> > > > +  on IA-32 and x64.
> > > > +
> > > > +  @param  Index The 32-bit XCR index to read.
> > > > +
> > > > +  @return The value of the XCR identified by Index.
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +EFIAPI
> > > > +AsmReadXcr (
> > > > +  IN UINT32  Index
> > > > +  );
> > > > +
> > > > +/**
> > > > +  Writes a 64-bit value to a Extended Control Register(XCR), and
> returns
> > > the
> > > > +  value.
> > > > +
> > > > +  Writes the 64-bit value specified by Value to the XCR specified by
> > > Index.
> > > > The
> > > > +  64-bit value written to the XCR is returned. No parameter checking
> is
> > > > +  performed on Index or Value, and some of these may cause CPU
> > > > exceptions. The
> > > > +  caller must either guarantee that Index and Value are valid, or the
> > > caller
> > > > +  must establish proper exception handlers. This function is only
> > > available
> > > > on
> > > > +  IA-32 and x64.
> > > > +
> > > > +  @param  Index The 32-bit XCR index to write.
> > > > +  @param  Value The 64-bit value to write to the XCR.
> > > > +
> > > > +  @return Value
> > > > +
> > > > +**/
> > > > +UINT64
> > > > +EFIAPI
> > > > +AsmWriteXcr (
> > > > +  IN UINT32  Index,
> > > > +  IN UINT64  Value
> > > > +  );
> > > > +
> > > >  #endif // defined (MDE_CPU_IA32) || defined (MDE_CPU_X64)
> > > >  #endif // !defined (__BASE_LIB__)
> > > > diff --git a/MdePkg/Library/BaseLib/BaseLib.inf
> > > > b/MdePkg/Library/BaseLib/BaseLib.inf
> > > > index 3b85c56c3c..e62031ea11 100644
> > > > --- a/MdePkg/Library/BaseLib/BaseLib.inf
> > > > +++ b/MdePkg/Library/BaseLib/BaseLib.inf
> > > > @@ -1,9 +1,9 @@
> > > >  ## @file
> > > >  #  Base Library implementation.
> > > >  #
> > > > -#  Copyright (c) 2007 - 2020, Intel Corporation. All rights reserved.
> <BR>
> > > > +#  Copyright (c) 2007 - 2021, Intel Corporation. All rights reserved.
> <BR>
> > > >  #  Portions copyright (c) 2008 - 2009, Apple Inc. All rights
> > > reserved.<BR>
> > > >  #  Portions copyright (c) 2011 - 2013, ARM Ltd. All rights
> reserved.<BR>
> > > >  #  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All
> > > > rights reserved.<BR>
> > > >  #
> > > >  #  SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > @@ -63,10 +63,12 @@
> > > >    BaseLibInternals.h
> > > >
> > > >  [Sources.Ia32]
> > > >    Ia32/WriteTr.nasm
> > > >    Ia32/Lfence.nasm
> > > > +  Ia32/ReadXcr.nasm
> > > > +  Ia32/WriteXcr.nasm
> > > >
> > > >    Ia32/Wbinvd.c | MSFT
> > > >    Ia32/WriteMm7.c | MSFT
> > > >    Ia32/WriteMm6.c | MSFT
> > > >    Ia32/WriteMm5.c | MSFT
> > > > diff --git a/MdePkg/Library/BaseLib/Ia32/ReadXcr.nasm
> > > > b/MdePkg/Library/BaseLib/Ia32/ReadXcr.nasm
> > > > new file mode 100644
> > > > index 0000000000..5d50d8ba01
> > > > --- /dev/null
> > > > +++ b/MdePkg/Library/BaseLib/Ia32/ReadXcr.nasm
> > > > @@ -0,0 +1,31 @@
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +;
> > > > +; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
> > > > +; SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +;
> > > > +; Module Name:
> > > > +;
> > > > +;   ReadXcr.Asm
> > > > +;
> > > > +; Abstract:
> > > > +;
> > > > +;   AsmReadXcr function
> > > > +;
> > > > +; Notes:
> > > > +;
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +
> > > > +    SECTION .text
> > > > +
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +; UINT64
> > > > +; EFIAPI
> > > > +; AsmReadXcr (
> > > > +;   IN UINT32  Index
> > > > +;   );
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +global ASM_PFX(AsmReadXcr)
> > > > +ASM_PFX(AsmReadXcr):
> > > > +    mov     ecx, [esp + 4]
> > > > +    xgetbv
> > > > +    ret
> > > > \ No newline at end of file
> > > > diff --git a/MdePkg/Library/BaseLib/Ia32/WriteXcr.nasm
> > > > b/MdePkg/Library/BaseLib/Ia32/WriteXcr.nasm
> > > > new file mode 100644
> > > > index 0000000000..009d41864b
> > > > --- /dev/null
> > > > +++ b/MdePkg/Library/BaseLib/Ia32/WriteXcr.nasm
> > > > @@ -0,0 +1,34 @@
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +;
> > > > +; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
> > > > +; SPDX-License-Identifier: BSD-2-Clause-Patent
> > > > +;
> > > > +; Module Name:
> > > > +;
> > > > +;   WriteXcr.nasm
> > > > +;
> > > > +; Abstract:
> > > > +;
> > > > +;   AsmWriteXcr function
> > > > +;
> > > > +; Notes:
> > > > +;
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +
> > > > +    SECTION .text
> > > > +
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +; UINT64
> > > > +; EFIAPI
> > > > +; AsmWriteXcr (
> > > > +;   IN UINT32  Index,
> > > > +;   IN UINT64  Value
> > > > +;   );
> > > >
> > >
> +;--------------------------------------------------------------------------
> > > ----
> > > > +global ASM_PFX(AsmWriteXcr)
> > > > +ASM_PFX(AsmWriteXcr):
> > > > +    mov     edx, [esp + 12]
> > > > +    mov     eax, [esp + 8]
> > > > +    mov     ecx, [esp + 4]
> > > > +    xsetbv
> > > > +    ret
> > > > \ No newline at end of file
> > > > --
> > > > 2.16.2.windows.1
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