Commit Graph

985 Commits

Author SHA1 Message Date
Mike Turner ada905ab5c MdeModulePkg DxeCore: Fix for missing Memory Attributes Table (MAT) update
The Fpdt driver (FirmwarePerformanceDxe) saves a memory address across
reboots, and then does an AllocatePage for that memory address.
If, on this boot, that memory comes from a Runtime memory bucket,
the MAT table is not updated. This causes Windows to boot into Recovery.

This patch blocks the memory manager from changing the page
from a special bucket to a different memory type.  Once the buckets are
allocated, we freeze the memory ranges for the OS, and fragmenting
the special buckets will cause errors resuming from hibernate (S4).

The references to S4 here are the use case that fails.  This
failure is root caused to an inconsistent behavior of the
core memory services themselves when type AllocateAddress is used.

The main issue is apparently with the UEFI memory map -- the UEFI memory
map reflects the pre-allocated bins, but the actual allocations at fixed
addresses may go out of sync with that. Everything else, such as:
- EFI_MEMORY_ATTRIBUTES_TABLE (page protections) being out of sync,
- S4 failing
are just symptoms / consequences.

This patch is cherry pick from Project Mu:
a9be767d9b
With the minor change,
1. Update commit message format to keep the message in 80 characters one line.
2. Remove // MU_CHANGE comments in source code.
3. Update comments style to follow edk2 style.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Liming Gao <liming.gao@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Acked-by: Hao A Wu <hao.a.wu@intel.com>
2019-08-20 19:53:31 +08:00
Zhang, Shenglei 0680d08683 MdeModulePkg/DxeIplPeim: Initialize pointer PageMapLevel5Entry
Initialize PageMapLevel5Entry at the beginning of the function.

This commit will fix a GCC 4.8.5 build failure introduced by commit
b3527dedc3.

OvmfPkg build failure wtih gcc 4.8.5 still exists at latest edk2 version.
The commit 46f8a68916 seems not to fix
the build failure completely.

Cc: Dandan Bi <dandan.bi@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
2019-08-16 09:03:18 +08:00
Zhang, Shenglei 46f8a68916 MdeModulePkg/DxeIplPeim: Relocate operation of PageMapLevel5Entry++
This commit will fix a GCC 4.8.5 build failure introduced by commit
b3527dedc3.

PageMapLevel5Entry may be uninitialized in original code, which means
uninitialized pointer will be modified at some circumstance.
So relocate the operation of PageMapLevel5Entry++ in order to make sure
the pointer could be modified only when it is initialized.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
2019-08-14 09:04:04 +08:00
Ni, Ray b3527dedc3 MdeModulePkg/DxeIpl: Create 5-level page table for long mode
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2008

DxeIpl is responsible to create page table for DXE phase running
either in long mode or in 32bit mode with certain protection
mechanism enabled (refer to ToBuildPageTable()).

The patch updates DxeIpl to create 5-level page table for DXE phase
running in long mode when PcdUse5LevelPageTable is TRUE and CPU
supports 5-level page table.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Eric Dong <eric.dong@intel.com>
2019-08-09 08:52:09 +08:00
Zhang, Shenglei 4ac8ceb5d6 MdeModulePkg: Remove RecoveryLib.h and PeiRecoveryLibNull
RecoveryLib.h and PeiRecoveryLibNull have been deprecated from 2009,
so remove them.
https://bugzilla.tianocore.org/show_bug.cgi?id=1299

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
2019-08-05 10:09:01 +08:00
Zhang, Shenglei b9c3cbf6ec MdeModulePkg: Remove S3Lib.h and PeiS3LibNull
S3Lib.h and PeiS3LibNull have been deprecated since 2009, so remove them.
https://bugzilla.tianocore.org/show_bug.cgi?id=1299

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Shenglei Zhang <shenglei.zhang@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
2019-08-05 10:08:44 +08:00
Michael D Kinney afebc51547 MdeModulePkg/PiSmmCore: Use unique structure signatures
https://bugzilla.tianocore.org/show_bug.cgi?id=1948

Update the data structure signatures in the PiSmmCore
to be unique. Some of the signatures are the same as those
used by the DxeCore. For example, the memory pool head and
tail structures use the same signature in the PiSmmCore
and DxeCore.  This means the use of the wrong FreePool API
will not be noticed at the time FreePool is called and a
failure can occur much later.  By making the signatures
unique, misuse of an API is caught at that time the API is
called.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
2019-08-02 16:40:34 -07:00
Wei6 Xu e761d18f01 MdeModulePkg/DxeIpl: Support Capsule On Disk.
REF: https://github.com/tianocore/tianocore.github.io/wiki/
UEFI-Capsule-on-Disk-Introducation

If Capsule On Disk mode, call Capsule On Disk Load PPI to load
capsules. When it fails, still goes to Firmware Update boot path.
BDS will clear corresponding indicator and reboot later on.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Chao B Zhang <chao.b.zhang@intel.com>
Signed-off-by: Wei6 Xu <wei6.xu@intel.com>
Reviewed-by: Chao B Zhang <chao.b.zhang@intel.com>
Acked-by: Hao A Wu <hao.a.wu@intel.com>
2019-06-26 15:10:41 +08:00
Bret Barkelew 8797683f96 MdeModulePkg/PeiMain: PeiAllocatePool: output NULL if HOB creation fails
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1901

The original logic is ASSERT if fail to create HOB. But
that doesn't make sense for release version. So it is required
to set the Buffer to null to indicate the failure.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Acked-by: Hao A Wu <hao.a.wu@intel.com>
2019-06-24 10:18:04 +08:00
Zhang, Chao B 57ec204e69 Revert "Capsule-on-Disk entire Patch
This reverts commit 0d4aa276d1,
                    6470a43160,
                    fd72860895,
                    7837d12498,
                    6b32af2e10,
                    8636f70b5a,
                    f17935321a
due to incorrect review process.

Cc: Wei6 Xu <wei6.xu@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Zhang, Chao B <chao.b.zhang@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
2019-06-21 10:25:25 +08:00
Wei6 Xu 6b32af2e10 MdeModulePkg/DxeIpl: Support Capsule On Disk.
https://github.com/tianocore/tianocore.github.io/wiki/UEFI-Capsule-
on-Disk-Introducation

If Capsule On Disk mode, call Capsule On Disk Load PPI to load
capsules. When it fails, still goes to Firmware Update boot path.
BDS will clear corresponding indicator and reboot later on.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Chao B Zhang <chao.b.zhang@intel.com>
Signed-off-by: Wei6 Xu <wei6.xu@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
Reviewed-by: Chao B Zhang <chao.b.zhang@intel.com>
2019-06-20 16:50:42 +08:00
Dandan Bi 728c7ffac3 MdeModulePkg/Core: Remove PcdFrameworkCompatibilitySupport usage
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1464

Currently Framework compatibility is not needed and
PcdFrameworkCompatibilitySupport will be removed from edk2.
So remove the usage of this PCD firstly.

Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2019-05-09 09:42:55 +08:00
Zhichao Gao eac49c837b MdeModulePkg/PeiMain: Change comments of PeiResetSystem2
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1460

Refer to Uefi spec 2.8, the ResetData is valid while ResetStatus
is EFI_SUCCESS regardless of the ResetType is EfiResetPlatformSpecific
or not.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Turner <Michael.Turner@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Signed-off-by: Zhichao Gao <zhichao.gao@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
2019-04-28 09:40:16 +08:00
Hao Wu dfaa565559 MdeModulePkg/DxeCore: Please static checker for false report
After commit 57df17fe26, some static check reports suspicious NULL pointer
deference at line:

  Entry->MachineType = Entry->Emulator->MachineType;
                       ^^^^^^^^^^^^^^^

within function PeCoffEmuProtocolNotify().

However, 'Entry->Emulator' is guaranteed to have a non-NULL value when
previous call to the CoreHandleProtocol() returns EFI_SUCCESS.

This commit will re-write the return status check for CoreHandleProtocol()
to add explicit NULL pointer check for protocol instance pointer.

Cc: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
2019-04-28 08:31:38 +08:00
Ard Biesheuvel 2e21e8c4b8 MdeModulePkg/DxeCore: remove explicit EBC handling
Now that the EBC machine type is no longer classified as a
natively supported machine type on the architectures that can
support it via the EBC interpreter, the EBC specific handling
in DXE core is no longer used and can be removed.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
2019-04-14 18:37:39 -07:00
Ard Biesheuvel 57df17fe26 MdeModulePkg/DxeCore: invoke the emulator protocol for foreign images
When encountering PE/COFF images that cannot be supported natively,
attempt to locate an instance of the PE/COFF image emulator protocol,
and if it supports the image, proceed with loading it and register it
with the emulator.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
2019-04-14 18:37:12 -07:00
Michael D Kinney 9d510e61fc MdeModulePkg: Replace BSD License with BSD+Patent License
https://bugzilla.tianocore.org/show_bug.cgi?id=1373

Replace BSD 2-Clause License with BSD+Patent License.  This change is
based on the following emails:

  https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html
  https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html

RFCs with detailed process for the license change:

  V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html
  V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html
  V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2019-04-09 10:58:08 -07:00
Eric Dong bb2c9ccb33 MdeModulePkg/PiSmmCore: Control S3 related functionality through flag.
https://bugzilla.tianocore.org/show_bug.cgi?id=1590

Use PcdAcpiS3Enable to control whether need to enable S3 related
functionality in Pi SMM Core.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
2019-03-21 15:19:17 +08:00
Star Zeng 9aef515648 MdeModulePkg/DxeCore: Ensure FfsFileHeader 8 bytes aligned
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=864
REF: CVE-2018-3630

To follow PI spec, ensure FfsFileHeader 8 bytes aligned.

For the integrity of FV(especially non-MemoryMapped FV) layout,
let CachedFv point to FV beginning, but not (FV + FV header).

And current code only handles (FwVolHeader->ExtHeaderOffset != 0) path,
update code to also handle (FwVolHeader->ExtHeaderOffset == 0) path.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2019-02-28 18:22:53 +08:00
Star Zeng 467e1ffa76 MdeModulePkg/PeiCore: Ensure FfsFileHeader 8 bytes aligned
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=864
REF: CVE-2018-3630

To follow PI spec, ensure FfsFileHeader 8 bytes aligned.

Current code only handles (FwVolHeader->ExtHeaderOffset != 0) path,
update code to also handle (FwVolHeader->ExtHeaderOffset == 0) path.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2019-02-28 18:22:52 +08:00
Chasel, Chiu 9b23c7ba9c MdeModulePkg/PeiMain: Support EFI_PEI_CORE_FV_LOCATION_PPI
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1524

When shadowing PeiCore the EFI_PEI_CORE_FV_LOCATION_PPI
should be checked to see if PeiCore not in BFV, otherwise
just shadowing PeiCore from BFV.

Test: Verified on internal platform and booting successfully.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
2019-02-15 13:40:30 +08:00
Ard Biesheuvel 76be882cdc MdeModulePkg/Dxe/Page: take MAX_ALLOC_ADDRESS into account
Take MAX_ALLOC_ADDRESS into account in the implementation of the
page allocation routines, so that they will only return memory
that is addressable by the CPU at boot time, even if more memory
is available in the GCD memory map.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2018-12-20 11:01:58 +01:00
Ard Biesheuvel 36b0754712 MdeModulePkg/Dxe/Gcd: disregard memory above MAX_ALLOC_ADDRESS
Update the GCD memory map initialization code so it disregards
memory that is not addressable by the CPU at boot time. This
only affects the first memory descriptor that is added, other
memory descriptors are permitted that describe memory ranges
that may be accessible to the CPU itself only when executing
under the OS.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2018-12-20 11:01:49 +01:00
Star Zeng f2bc359ced MdeModulePkg PeiCore: Remove the using of PcdPeiCoreMaxPpiSupported
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1405

Background as below.

Problem:
As static configuration from the PCDs, the binary PeiCore (for example
in FSP binary with dispatch mode) could not predict how many FVs,
Files or PPIs for different platforms.

Burden:
Platform developers need configure the PCDs accordingly for different
platforms.

To solve the problem and remove the burden, we can update code to
remove the using of PcdPeiCoreMaxFvSupported, PcdPeiCoreMaxPeimPerFv
and PcdPeiCoreMaxPpiSupported by extending buffer dynamically for FV,
File and PPI management.

This patch removes the using of PcdPeiCoreMaxPpiSupported in PeiCore.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2018-12-19 12:33:30 +08:00
Star Zeng 111e6c920d MdeModulePkg PeiCore: Remove the using of PcdPeiCoreMaxFvSupported
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1405

Background as below.

Problem:
As static configuration from the PCDs, the binary PeiCore (for example
in FSP binary with dispatch mode) could not predict how many FVs,
Files or PPIs for different platforms.

Burden:
Platform developers need configure the PCDs accordingly for different
platforms.

To solve the problem and remove the burden, we can update PeiCore to
remove the using of PcdPeiCoreMaxFvSupported, PcdPeiCoreMaxPeimPerFv
and PcdPeiCoreMaxPpiSupported by extending buffer dynamically for FV,
File and PPI management.

This patch removes the using of PcdPeiCoreMaxFvSupported in PeiCore.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
2018-12-19 12:33:29 +08:00
Star Zeng b62fe5708b MdeModulePkg PeiCore: Remove the using of PcdPeiCoreMaxPeimPerFv
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1405

Background as below.

Problem:
As static configuration from the PCDs, the binary PeiCore (for example
in FSP binary with dispatch mode) could not predict how many FVs,
Files or PPIs for different platforms.

Burden:
Platform developers need configure the PCDs accordingly for different
platforms.

To solve the problem and remove the burden, we can update code to
remove the using of PcdPeiCoreMaxFvSupported, PcdPeiCoreMaxPeimPerFv
and PcdPeiCoreMaxPpiSupported by extending buffer dynamically for FV,
File and PPI management.

This patch removes the using of PcdPeiCoreMaxPeimPerFv in PeiCore.

Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Chasel Chiu <chasel.chiu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>
2018-12-19 12:33:27 +08:00
Jian J Wang 0adc6eae94 MdeModulePkg/Core: fix ineffective guard page issue
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1295

This issue originates from following patch which allows to enable
paging if PcdImageProtectionPolicy and PcdDxeNxMemoryProtectionPolicy
(in addition to PcdSetNxForStack) are set to enable related features.

  5267926134

Due to above change, PcdImageProtectionPolicy will be set to 0 by
default in many platforms, which, in turn, cause following code in
MdeModulePkg\Core\Dxe\Misc\MemoryProtection.c fail the creation of
notify event of CpuArchProtocol.

1138:  if (mImageProtectionPolicy != 0 ||
           PcdGet64 (PcdDxeNxMemoryProtectionPolicy) != 0) {
1139:  Status = CoreCreateEvent (
...
1142:             MemoryProtectionCpuArchProtocolNotify,
...
1145:             );

Then following call flow won't be done and Guard pages will not be
set as not-present in SetAllGuardPages() eventually.

   MemoryProtectionCpuArchProtocolNotify()
=> HeapGuardCpuArchProtocolNotify()
=> SetAllGuardPages()

The solution is removing the if(...) statement so that the notify
event will always be created and registered. This won't cause
unnecessary code execution because, in the notify event handler,
the related PCDs like

    PcdImageProtectionPolicy and
    PcdDxeNxMemoryProtectionPolicy

will be checked again before doing related jobs.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-11-07 23:08:27 +08:00
Jian J Wang 8a7ff892ca MdeModulePkg/Core: fill logic hole in MemoryProtectionCpuArchProtocolNotify
At the end of of MemoryProtectionCpuArchProtocolNotify there's cleanup
code to free resource. But at line 978, 994, 1005 the function returns
directly. This patch use "goto" to replace "return" to make sure the
resource is freed before exit.

1029:  CoreCloseEvent (Event);
1030:  return;

There's another memory leak after calling gBS->LocateHandleBuffer() in
the same function:

  Status = gBS->LocateHandleBuffer (
                  ByProtocol,
                  &gEfiLoadedImageProtocolGuid,
                  NULL,
                  &NoHandles,
                  &HandleBuffer
                  );

HandleBuffer is allocated in above call but never freed. This patch
will also add code to free it.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-11-07 23:08:26 +08:00
Ruiyu Ni bfc87aa78e MdeModulePkg/PiSmmIpl: Do not reset SMRAM to UC when CPU driver runs
Today's PiSmmIpl implementation initially sets SMRAM to WB to speed
up the SMM core/modules loading before SMM CPU driver runs.
When SMM CPU driver runs, PiSmmIpl resets the SMRAM to UC. It's done
in SmmIplDxeDispatchEventNotify(). COMM_BUFFER_SMM_DISPATCH_RESTART
is returned from SMM core that SMM CPU driver is just dispatched.

Since now the SMRR is widely used to control the SMRAM cache setting.
It's not needed to reset the SMRAM to UC anymore.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael Kinney <michael.d.kinney@intel.com>
2018-11-01 10:06:30 +08:00
Jian J Wang 61a62fc258 MdeModulePkg/Core: fix an issue of potential NULL pointer access
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1286

This issue is introduced by bb685071c2.

The *MemorySpaceMap assigned with NULL (line 1710) value might be
accessed (line 1726/1730) without any sanity check. Although it won't
happen in practice because of line 1722, we still need to add check
against NULL to make static code analyzer happy.

1710  *MemorySpaceMap       = NULL;
....  ...
1722  if (DescriptorCount == *NumberOfDescriptors) {
....  ...
1726    Descriptor = *MemorySpaceMap;
....  ...
1730        BuildMemoryDescriptor (Descriptor, Entry);

Tests:
  Pass build and boot to shell.

Cc: Hao Wu <hao.a.wu@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Hao Wu <hao.a.wu@intel.com>
2018-10-30 10:16:03 +08:00
Jian J Wang 895415ed47 MdeModulePkg/Core: correct one coding style
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1284

Non-Boolean comparisons should use a compare operator
(==, !=, >, < >=, <=)

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
2018-10-27 21:33:13 +08:00
Jian J Wang e5001ab7a9 MdeModulePkg/Core: fix an IA32 build failure
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1277

The failure is caused by data type conversion between UINTN and UINT64,
which is checked in at 63ebde8ef6.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-10-26 16:04:37 +08:00
Jian J Wang 63ebde8ef6 MdeModulePkg/Core: add freed-memory guard feature
Freed-memory guard is used to detect UAF (Use-After-Free) memory issue
which is illegal access to memory which has been freed. The principle
behind is similar to pool guard feature, that is we'll turn all pool
memory allocation to page allocation and mark them to be not-present
once they are freed.

This also implies that, once a page is allocated and freed, it cannot
be re-allocated. This will bring another issue, which is that there's
risk that memory space will be used out. To address it, the memory
service add logic to put part (at most 64 pages a time) of freed pages
back into page pool, so that the memory service can still have memory
to allocate, when all memory space have been allocated once. This is
called memory promotion. The promoted pages are always from the eldest
pages which haven been freed.

This feature brings another problem is that memory map descriptors will
be increased enormously (200+ -> 2000+). One of change in this patch
is to update MergeMemoryMap() in file PropertiesTable.c to allow merge
freed pages back into the memory map. Now the number can stay at around
510.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-10-26 10:30:35 +08:00
Jian J Wang bb685071c2 MdeModulePkg/Core: prevent re-acquire GCD memory lock
This issue is hidden in current code but exposed by introduction
of freed-memory guard feature due to the fact that the feature
will turn all pool allocation to page allocation.

The solution is moving the memory allocation in CoreGetMemorySpaceMap()
to be out of the GCD memory map lock.

   CoreDumpGcdMemorySpaceMap()
=> CoreGetMemorySpaceMap()
=> CoreAcquireGcdMemoryLock () *
   AllocatePool()
=> InternalAllocatePool()
=> CoreAllocatePool()
=> CoreAllocatePoolI()
=> CoreAllocatePoolPagesI()
=> CoreAllocatePoolPages()
=> FindFreePages()
=> PromoteMemoryResource()
=> CoreAcquireGcdMemoryLock()  **

Cc: Star Zeng <star.zeng@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-10-26 10:30:34 +08:00
Jian J Wang 5267926134 MdeModulePkg/DxeIpl: support more NX related PCDs
BZ#1116: https://bugzilla.tianocore.org/show_bug.cgi?id=1116

Currently IA32_EFER.NXE is only set against PcdSetNxForStack. This
confuses developers because following two other PCDs also need NXE
to be set, but actually not.

    PcdDxeNxMemoryProtectionPolicy
    PcdImageProtectionPolicy

This patch solves this issue by adding logic to enable IA32_EFER.NXE
if any of those PCDs have anything enabled.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2018-09-26 08:55:10 +08:00
Ard Biesheuvel 05cfd73f01 MdeModulePkg: remove PE/COFF header workaround for ELILO on IPF
Now that Itanium support has been dropped, we can remove the various
occurrences of the ELILO on Itanium PE/COFF header workaround.

Link: https://bugzilla.tianocore.org/show_bug.cgi?id=816
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-09-24 16:56:32 +02:00
Jian J Wang 2af2988f3a MdeModulePkg/DxeIpl: disable paging before creating new page table
PEI Stack Guard needs to enable paging before DxeIpl. This might cause
#GP in the transition from 32-bit PEI to 64-bit DXE due to the code
trying to write CR3 register with PML4 page table while the processor
is enabled with PAE paging.

Simply disabling paging before updating CR3 can solve this conflict.
There's no such issue for 64-bit PEI so this change applies only to
32-bit code.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: "Ware, Ryan R" <ryan.r.ware@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
2018-09-10 09:28:26 +08:00
Liming Gao 40a7b235e4 MdeModulePkg PeiCore: Always use PeiImageRead() function to load PEI image
In V2, Remove GetImageReadFunction(), directly use PeiImageRead().

The copy PeiImageReadForShadow function doesn't improve the boot performance.
This patch removes this copy logic to simplify the code logic.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-09-07 21:39:26 +08:00
Chen A Chen de005223b7 MdeModulePkg: Removing ipf which is no longer supported from edk2.
Removing rules for Ipf sources file:
* Remove the source file which path with "ipf" and also listed in
  [Sources.IPF] section of INF file.
* Remove the source file which listed in [Components.IPF] section
  of DSC file and not listed in any other [Components] section.
* Remove the embedded Ipf code for MDE_CPU_IPF.

Removing rules for Inf file:
* Remove IPF from VALID_ARCHITECTURES comments.
* Remove DXE_SAL_DRIVER from LIBRARY_CLASS in [Defines] section.
* Remove the INF which only listed in [Components.IPF] section in DSC.
* Remove statements from [BuildOptions] that provide IPF specific flags.
* Remove any IPF sepcific sections.

Removing rules for Dec file:
* Remove [Includes.IPF] section from Dec.

Removing rules for Dsc file:
* Remove IPF from SUPPORTED_ARCHITECTURES in [Defines] section of DSC.
* Remove any IPF specific sections.
* Remove statements from [BuildOptions] that provide IPF specific flags.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Chen A Chen <chen.a.chen@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-09-06 15:25:16 +08:00
Star Zeng 4a76d9b9a3 MdeModulePkg: Remove trailing white space
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1144

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
2018-09-06 09:17:03 +08:00
Star Zeng 8a204b2aca MdeModulePkg PeiCore: Fix VS2012 build failure
fwvol.c(1572) : warning C4701: potentially uninitialized
local variable 'Status' used

The build failure is caused by
0e042d0ad7 for
https://bugzilla.tianocore.org/show_bug.cgi?id=1131

This patch initializes Status to fix the build failure.

Cc: Dandan Bi <dandan.bi@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Dandan Bi <dandan.bi@intel.com>
2018-09-05 13:17:10 +08:00
Star Zeng e3b9ab433a MdeModulePkg DxeCore: Handle multiple FV images in one FV file
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1131

PI spec and BaseTools support to generate multiple FV images
in one FV file.
This patch is to update DxeCore to handle the case.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2018-09-03 17:04:58 +08:00
Star Zeng 0e042d0ad7 MdeModulePkg PeiCore: Handle multiple FV images in one FV file
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1131

PI spec and BaseTools support to generate multiple FV images
in one FV file.
This patch is to update PeiCore to handle the case.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2018-09-03 17:04:57 +08:00
Eric Dong f965b772fc MdeModulePkg/PiSmmCore: Check valid memory range.
Call BS.AllocatePages in DXE driver and call SMM FreePages with the address of the buffer allocated in the DXE driver. SMM FreePages success and add a non-SMRAM range into SMM heap list. This is not an expected behavior. SMM FreePages should return error for this case and not free the pages.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1098

Change-Id: Ie5ffa1ac62c558aa418a8a3d7d0e8158b846e13b
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-08-28 10:24:25 +08:00
shenglei d637282efe MdeModulePkg PiSmmCore: Remove redundant functions
The functions that are never called have been removed.
They are IsImageInsideSmram,FindImageRecord,SmmRemoveImageRecord,
SmmMemoryAttributesTableConsistencyCheck,DumpSmmMemoryMapEntry,
SmmMemoryMapConsistencyCheckRange,SmmMemoryMapConsistencyCheck,
DumpSmmMemoryMap,ClearGuardMapBit,SetGuardMapBit,AdjustMemoryA,
AdjustMemoryS,IsHeadGuard and IsTailGuard.
FindImageRecord() is called by SmmRemoveImageRecord(); however,
nothing calls SmmRemoveImageRecord().
SmmMemoryMapConsistencyCheckRange() is called by
SmmMemoryMapConsistencyCheck(); however, nothing calls
SmmMemoryMapConsistencyCheck().
https://bugzilla.tianocore.org/show_bug.cgi?id=1062

v2:append the following to the commit message.
- FindImageRecord() is called by SmmRemoveImageRecord(); however,
nothing calls SmmRemoveImageRecord().
- SmmMemoryMapConsistencyCheckRange() is called by
SmmMemoryMapConsistencyCheck(); however, nothing calls
SmmMemoryMapConsistencyCheck().

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <shenglei.zhang@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-08-21 16:29:04 +08:00
shenglei 5bde6c2019 MdeModulePkg Core/Dxe: Remove redundant functions
The functions that are never called have been removed.
They are ClearGuardMapBit,SetGuardMapBit,IsHeadGuard,
IsTailGuard and CoreEfiNotAvailableYetArg0.
https://bugzilla.tianocore.org/show_bug.cgi?id=1062

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <shenglei.zhang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-08-21 16:29:04 +08:00
shenglei 131818ba5a MdeModulePkg: Remove redundant library classes and GUIDs
Some redundant library classes and GUIDs
have been removed in inf, .c and .h files.
https://bugzilla.tianocore.org/show_bug.cgi?id=1044
https://bugzilla.tianocore.org/show_bug.cgi?id=1045
https://bugzilla.tianocore.org/show_bug.cgi?id=1047
https://bugzilla.tianocore.org/show_bug.cgi?id=1049
https://bugzilla.tianocore.org/show_bug.cgi?id=1051
https://bugzilla.tianocore.org/show_bug.cgi?id=1052
https://bugzilla.tianocore.org/show_bug.cgi?id=1053
https://bugzilla.tianocore.org/show_bug.cgi?id=1054
https://bugzilla.tianocore.org/show_bug.cgi?id=1055
https://bugzilla.tianocore.org/show_bug.cgi?id=1056
https://bugzilla.tianocore.org/show_bug.cgi?id=1017
https://bugzilla.tianocore.org/show_bug.cgi?id=1035
https://bugzilla.tianocore.org/show_bug.cgi?id=1033
https://bugzilla.tianocore.org/show_bug.cgi?id=1012
https://bugzilla.tianocore.org/show_bug.cgi?id=1011
https://bugzilla.tianocore.org/show_bug.cgi?id=1062

v2:
1. Correct copyright year.
2. Fix alignment issue in AcpiPlatformDxe.inf.
3. Add DevicePathLib which is removed before in I2cHostDxe.inf.
4. Update NvmExpressPei.inf, NvmExpressPei.h, IScsiDxe.inf,
   IScsiDxe.inf, IScsiDxe.h, DxeMain.inf, DxeMain.h, PiSmmCore.inf
   and PiSmmCore.h for https://bugzilla.tianocore.org/show_bug.cgi?id=1062.

v3:
1. Add https://bugzilla.tianocore.org/show_bug.cgi?id=1062 to the
   link list.
2. Remove DevicePathLib from I2cHostDxe.inf.
3. Update NvmExpressPei.inf, NvmExpressPei.h, UfsPciHcDxe.inf,
   UfsPciHcDxe.h, I2cHostDxe.inf, AtaBusDxe.inf, IScsiDxe.inf,
   IScsiDxe.h, DxeMain.inf, DxeMain.h, PiSmmCore.inf and PiSmmCore.h
   for https://bugzilla.tianocore.org/show_bug.cgi?id=1062.
   (Forget to add UfsPciHcDxe.inf, UfsPciHcDxe.h, AtaBusDxe.inf,
   and I2cHostDxe.inf previously.)

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: shenglei <shenglei.zhang@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-08-20 14:53:45 +08:00
Jiewen Yao 4a723ed258 MdeModulePkg/DxeCore: Not update RtCode in MemAttrTable after EndOfDxe
We want to provide precise info in MemAttribTable
to both OS and SMM, and SMM only gets the info at EndOfDxe.
So we do not update RtCode entry in EndOfDxe.

The impact is that if 3rd part OPROM is runtime, it cannot be executed
at UEFI runtime phase.
Currently, we do not see compatibility issue, because the only runtime
OPROM we found before in UNDI, and UEFI OS will not use UNDI interface
in OS.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-07-26 22:51:27 +08:00
Jiewen Yao b2305dd277 MdeModulePkg/DxeCore: Install UEFI mem attrib table at EndOfDxe.
So that the SMM can consume it to set page protection for
the UEFI runtime page with EFI_MEMORY_RO attribute.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jiewen Yao <jiewen.yao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2018-07-26 22:51:23 +08:00
Dandan Bi 98d20e44dc MdeModulePkg/DxeLoadFunc: Add use case for new Perf macro
Add an example case for the usage of
PERF_EVENT_SIGNAL_BEGIN/PERF_EVENT_SIGNAL_END

Cc: Liming Gao <liming.gao@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
2018-07-26 13:38:24 +08:00