sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

UefiCpuPkg/DxeMpLib: Make sure APs in safe loop code

Browse Source 
Add one semaphore to make sure BSP to wait till all APs run in AP safe loop
code.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Feng Tian <feng.tian@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>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Jeff Fan
2016-11-25 13:18:57 +08:00
parent bf2786dc79
commit 9f91cb01c4
4 changed files with 15 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c
View File

@@ -27,6 +27,7 @@ EFI_EVENT mLegacyBootEvent = NULL;
volatile BOOLEAN mStopCheckAllApsStatus = TRUE;
VOID *mReservedApLoopFunc = NULL;
UINTN mReservedTopOfApStack;
volatile UINT32 mNumberToFinish = 0;
/**
Get the pointer to CPU MP Data structure.
@@ -253,7 +254,8 @@ RelocateApLoop (
MwaitSupport,
CpuMpData->ApTargetCState,
CpuMpData->PmCodeSegment,
mReservedTopOfApStack - ProcessorNumber * AP_SAFE_STACK_SIZE
mReservedTopOfApStack - ProcessorNumber * AP_SAFE_STACK_SIZE,
(UINTN) &mNumberToFinish
);
//
// It should never reach here
@@ -282,7 +284,11 @@ MpInitChangeApLoopCallback (
CpuMpData->SaveRestoreFlag = TRUE;
CpuMpData->PmCodeSegment = GetProtectedModeCS ();
CpuMpData->ApLoopMode = PcdGet8 (PcdCpuApLoopMode);
mNumberToFinish = CpuMpData->CpuCount - 1;
WakeUpAP (CpuMpData, TRUE, 0, RelocateApLoop, NULL);
while (mNumberToFinish > 0) {
CpuPause ();
}
DEBUG ((DEBUG_INFO, "%a() done!\n", __FUNCTION__));
}