[edk2-devel] [PATCH v13 06/46] MdePkg/BaseLib: Add support for the XGETBV instruction
Liming Gao
liming.gao at intel.com
Mon Aug 3 02:29:57 UTC 2020
Reviewed-by: Liming Gao <liming.gao at intel.com>
-----Original Message-----
From: Tom Lendacky <thomas.lendacky at amd.com>
Sent: 2020年7月31日 2:43
To: devel at edk2.groups.io
Cc: Brijesh Singh <brijesh.singh at amd.com>; Ard Biesheuvel <ard.biesheuvel at arm.com>; Dong, Eric <eric.dong at intel.com>; Justen, Jordan L <jordan.l.justen at intel.com>; Laszlo Ersek <lersek at redhat.com>; Gao, Liming <liming.gao at intel.com>; Kinney, Michael D <michael.d.kinney at intel.com>; Ni, Ray <ray.ni at intel.com>
Subject: [PATCH v13 06/46] MdePkg/BaseLib: Add support for the XGETBV instruction
From: Tom Lendacky <thomas.lendacky at amd.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Under SEV-ES, a CPUID instruction requires the current value of the XCR0 register. In order to retrieve that value, the XGETBV instruction needs to be executed.
Provide the necessary support to execute the XGETBV instruction.
Cc: Michael D Kinney <michael.d.kinney at intel.com>
Cc: Liming Gao <liming.gao at intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
MdePkg/Library/BaseLib/BaseLib.inf | 2 ++
MdePkg/Include/Library/BaseLib.h | 17 +++++++++++++
MdePkg/Library/BaseLib/Ia32/XGetBv.nasm | 31 ++++++++++++++++++++++ MdePkg/Library/BaseLib/X64/XGetBv.nasm | 34 +++++++++++++++++++++++++
4 files changed, 84 insertions(+)
create mode 100644 MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
create mode 100644 MdePkg/Library/BaseLib/X64/XGetBv.nasm
diff --git a/MdePkg/Library/BaseLib/BaseLib.inf b/MdePkg/Library/BaseLib/BaseLib.inf
index c740a819cacf..3b93b5db8d24 100644
--- a/MdePkg/Library/BaseLib/BaseLib.inf
+++ b/MdePkg/Library/BaseLib/BaseLib.inf
@@ -183,6 +183,7 @@ [Sources.Ia32]
Ia32/EnableCache.nasm| GCC
Ia32/DisableCache.nasm| GCC
Ia32/RdRand.nasm
+ Ia32/XGetBv.nasm
Ia32/DivS64x64Remainder.c
Ia32/InternalSwitchStack.c | MSFT
@@ -315,6 +316,7 @@ [Sources.X64]
X64/EnableDisableInterrupts.nasm
X64/DisablePaging64.nasm
X64/RdRand.nasm
+ X64/XGetBv.nasm
ChkStkGcc.c | GCC
[Sources.EBC]
diff --git a/MdePkg/Include/Library/BaseLib.h b/MdePkg/Include/Library/BaseLib.h
index 8e7b87cbda4e..7edf0051a0a0 100644
--- a/MdePkg/Include/Library/BaseLib.h
+++ b/MdePkg/Include/Library/BaseLib.h
@@ -7831,6 +7831,23 @@ AsmLfence (
VOID
);
+/**
+ Executes a XGETBV instruction
+
+ Executes a XGETBV instruction. This function is only available on
+ IA-32 and x64.
+
+ @param[in] Index Extended control register index
+
+ @return The current value of the extended control register
+**/
+UINT64
+EFIAPI
+AsmXGetBv (
+ IN UINT32 Index
+ );
+
+
/**
Patch the immediate operand of an IA32 or X64 instruction such that the byte,
word, dword or qword operand is encoded at the end of the instruction's diff --git a/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
new file mode 100644
index 000000000000..9f7b03bbff35
--- /dev/null
+++ b/MdePkg/Library/BaseLib/Ia32/XGetBv.nasm
@@ -0,0 +1,31 @@
+;----------------------------------------------------------------------
+--------
+;
+; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights
+reserved.<BR> ; SPDX-License-Identifier: BSD-2-Clause-Patent ; ; Module
+Name:
+;
+; XGetBv.Asm
+;
+; Abstract:
+;
+; AsmXgetBv function
+;
+; Notes:
+;
+;----------------------------------------------------------------------
+--------
+
+ SECTION .text
+
+;----------------------------------------------------------------------
+--------
+; UINT64
+; EFIAPI
+; AsmXGetBv (
+; IN UINT32 Index
+; );
+;----------------------------------------------------------------------
+--------
+global ASM_PFX(AsmXGetBv)
+ASM_PFX(AsmXGetBv):
+ mov ecx, [esp + 4]
+ xgetbv
+ ret
diff --git a/MdePkg/Library/BaseLib/X64/XGetBv.nasm b/MdePkg/Library/BaseLib/X64/XGetBv.nasm
new file mode 100644
index 000000000000..09f3be8ae0a8
--- /dev/null
+++ b/MdePkg/Library/BaseLib/X64/XGetBv.nasm
@@ -0,0 +1,34 @@
+;----------------------------------------------------------------------
+--------
+;
+; Copyright (C) 2020, Advanced Micro Devices, Inc. All rights
+reserved.<BR> ; SPDX-License-Identifier: BSD-2-Clause-Patent ; ; Module
+Name:
+;
+; XGetBv.Asm
+;
+; Abstract:
+;
+; AsmXgetBv function
+;
+; Notes:
+;
+;----------------------------------------------------------------------
+--------
+
+ DEFAULT REL
+ SECTION .text
+
+;----------------------------------------------------------------------
+--------
+; UINT64
+; EFIAPI
+; AsmXGetBv (
+; IN UINT32 Index
+; );
+;----------------------------------------------------------------------
+--------
+global ASM_PFX(AsmXGetBv)
+ASM_PFX(AsmXGetBv):
+ xgetbv
+ shl rdx, 32
+ or rax, rdx
+ ret
+
--
2.27.0
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