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UefiCpuPkg: Shadow microcode patch according to FIT microcode entry.

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The existing MpInitLib will shadow the microcode update patches from
flash to memory and this is done by searching microcode region specified
by PCD PcdCpuMicrocodePatchAddress and PcdCpuMicrocodePatchRegionSize.
This brings a limition to platform FW that all the microcode patches must
be placed in one continuous flash space.

This patch shadows microcode update according to FIT microcode entries if
it's present, otherwise it will fallback to original logic (by PCD).

A new featured PCD gUefiCpuPkgTokenSpaceGuid.PcdCpuShadowMicrocodeByFit
is added for enabling/disabling this support.

TEST: Tested on FIT enabled platform.
BZ: https://tianocore.acgmultimedia.com/show_bug.cgi?id=2449

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Siyuan Fu
2020-01-08 11:22:30 +08:00
committed by mergify[bot]
parent c7c964b109
commit dd01704111
7 changed files with 222 additions and 67 deletions
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6
UefiCpuPkg/UefiCpuPkg.dec
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@@ -139,6 +139,12 @@
# @Prompt Lock SMM Feature Control MSR.
gUefiCpuPkgTokenSpaceGuid.PcdCpuSmmFeatureControlMsrLock|TRUE|BOOLEAN|0x3213210B
## Indicates if FIT based microcode shadowing will be enabled.<BR><BR>
# TRUE - FIT base microcode shadowing will be enabled.<BR>
# FALSE - FIT base microcode shadowing will be disabled.<BR>
# @Prompt FIT based microcode shadowing.
gUefiCpuPkgTokenSpaceGuid.PcdCpuShadowMicrocodeByFit|FALSE|BOOLEAN|0x3213210D
[PcdsFixedAtBuild]
## List of exception vectors which need switching stack.
# This PCD will only take into effect if PcdCpuStackGuard is enabled.