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UefiCpuPkg/PiSmmCpuDxeSmm: Clear some semaphores on S3 boot path 

Some semaphores are not cleared on S3 boot path. For example,
mSmmMpSyncData->CpuData[CpuIndex].Present. It may still keeps the value set at
SMM runtime during S3 resume. It may causes BSP have the wrong judgement on SMM
AP's present state.

We have one related fix at e78a2a49ee. But that is
not completed.

This fix is to clear Busy/Run/Present semaphores in InitializeMpSyncData().

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Feng Tian <feng.tian@intel.com>
This commit is contained in:
Jeff Fan 2016-11-29 15:48:32 +08:00
parent eae631bc68
commit 56e4a7d726
1 changed files with 3 additions and 0 deletions
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3
UefiCpuPkg/PiSmmCpuDxeSmm/MpService.c
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@ -1357,6 +1357,9 @@ InitializeMpSyncData (
(UINT32 *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Run + mSemaphoreSize * CpuIndex);
mSmmMpSyncData->CpuData[CpuIndex].Present =
(BOOLEAN *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Present + mSemaphoreSize * CpuIndex);
*(mSmmMpSyncData->CpuData[CpuIndex].Busy) = 0;
*(mSmmMpSyncData->CpuData[CpuIndex].Run) = 0;
*(mSmmMpSyncData->CpuData[CpuIndex].Present) = FALSE;
}
}
}