[edk2-devel] [PATCH 0/6] Fix race condition and add event protocol

[Gao, Zhichao]

There is a race condition in CoreWaitForEvent function:
If an interrupt happens between CheckEvent and gIdleLoopEvent,
there would be a event pending during cpu sleep. 
So it is required to check the gEventPending with the interrupt
disabled.
Implement a gEfiCpu2ProtocolGuid to fix that. The protocol include
one interface to enable interrupt and put the cpu to sleep.

Add a event protocol gEdkiiCommonEventProtocolGuid to support
all TPL event. It is require for PI drivers that use HW interrput.

Cc: Jian J Wang <jian.j.wang at intel.com>
Cc: Hao A Wu <hao.a.wu at intel.com>
cc: Ray Ni <ray.ni at intel.com>
Cc: Star Zeng <star.zeng at intel.com>
Cc: Liming gao <liming.gao at intel.com>
Cc: Sean Brogan <sean.brogan at microsoft.com>
Cc: Michael Turner <Michael.Turner at microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew at microsoft.com>
Cc: Michael D Kinney <michael.d.kinney at intel.com>
Cc: Eric Dong <eric.dong at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>

Sean Brogan (5):
  MdeModulePkg: Add gEdkiiCommonEventProtocolGuid for event
  MdePkg/BaseLib.h: Add EnableInterruptsAndSleep function declare
  MdePkg/BaseLib: Implement EnableInterruptsAndSleep
  MdePkg: Add gEfiCpu2ProtocolGuid and header file
  MdeModulePkg/DxeMain: Implement common event protocol

Zhichao Gao (1):
  UefiCpuPkg/CpuDxe: Implement Cpu2 protocol

 MdeModulePkg/Core/Dxe/DxeMain.h               |  64 ++++++++++-
 MdeModulePkg/Core/Dxe/DxeMain.inf             |   1 +
 MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c       |  22 ++++
 .../Core/Dxe/DxeMain/DxeProtocolNotify.c      |   1 +
 MdeModulePkg/Core/Dxe/Event/Event.c           | 102 ++++++++++++++++--
 MdeModulePkg/Core/Dxe/Event/Event.h           |   2 +-
 MdeModulePkg/Include/Protocol/CommonEvent.h   |  18 ++++
 MdeModulePkg/MdeModulePkg.dec                 |   3 +
 MdePkg/Include/Library/BaseLib.h              |  11 ++
 MdePkg/Include/Protocol/Cpu2.h                |  43 ++++++++
 .../Library/BaseLib/Ia32/EnableInterrupts.c   |  18 +++-
 .../BaseLib/Ia32/EnableInterrupts.nasm        |  15 ++-
 .../Library/BaseLib/X64/EnableInterrupts.nasm |  15 ++-
 MdePkg/MdePkg.dec                             |   3 +
 UefiCpuPkg/CpuDxe/CpuDxe.c                    |  40 ++++++-
 UefiCpuPkg/CpuDxe/CpuDxe.h                    |  15 +++
 UefiCpuPkg/CpuDxe/CpuDxe.inf                  |   3 +-
 17 files changed, 358 insertions(+), 18 deletions(-)
 create mode 100644 MdeModulePkg/Include/Protocol/CommonEvent.h
 create mode 100644 MdePkg/Include/Protocol/Cpu2.h

-- 
2.21.0.windows.1


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