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MdePkg/BaseLib: Add support for the XGETBV instruction

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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@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Tom Lendacky
2020-08-12 15:21:35 -05:00
committed by mergify[bot]
parent b098f5e9e9
commit 9b3ca509ab
4 changed files with 84 additions and 0 deletions
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2
MdePkg/Library/BaseLib/BaseLib.inf
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@@ -183,6 +183,7 @@
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 @@
X64/EnableDisableInterrupts.nasm
X64/DisablePaging64.nasm
X64/RdRand.nasm
X64/XGetBv.nasm
ChkStkGcc.c | GCC
[Sources.EBC]