Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <[email protected]>
---
UefiCpuPkg/CpuDxe/CpuMp.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/UefiCpuPkg/CpuDxe/CpuMp.c b/UefiCpuPkg/CpuDxe/CpuMp.c
index 82554c1..7e12103 100644
--- a/UefiCpuPkg/CpuDxe/CpuMp.c
+++ b/UefiCpuPkg/CpuDxe/CpuMp.c
@@ -27,6 +27,7 @@ VOID *mApStackStart = 0;
volatile UINTN mNumberOfProcessors;
volatile UINTN mIndexOfProcessors;
+volatile UINTN mApDoneCount = 0;
volatile BOOLEAN mAllApsInitFinished = FALSE;
EFI_MP_SERVICES_PROTOCOL mMpServicesTemplate = {
@@ -1199,6 +1200,51 @@ out:
}
/**
+ After APs switch to its own stack, they can
+ do a loop for waiting a Procedure to execute.
+
+ @param Context the pointer to CpuData
+
+**/
+VOID
+EFIAPI
+ApDoLoop (
+ IN VOID *Context
+ )
+{
+ CPU_DATA_BLOCK *CpuData;
+ EFI_AP_PROCEDURE Procedure;
+ VOID *ProcedureArgument;
+
+ CpuData = (CPU_DATA_BLOCK *)Context;
+
+ while (TRUE) {
+ while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {
+ CpuPause ();
+ }
+
+ ProcedureArgument = CpuData->Parameter;
+ Procedure = CpuData->Procedure;
+ ReleaseSpinLock (&CpuData->CpuDataLock);
+
+ if (Procedure != NULL) {
+ SetApState (CpuData, CpuStateBuzy);
+
+ Procedure (ProcedureArgument);
+
+ while (!AcquireSpinLockOrFail (&CpuData->CpuDataLock)) {
+ CpuPause ();
+ }
+
+ CpuData->Procedure = NULL;
+ ReleaseSpinLock (&CpuData->CpuDataLock);
+
+ SetApState (CpuData, CpuStateFinished);
+ }
+ }
+}
+
+/**
Application Processors do loop routine
after switch to its own stack.
@@ -1222,7 +1268,10 @@ ProcessorToIdleState (
CpuData->Info.Location.Thread = 0;
mIndexOfProcessors++;
+ mApDoneCount++;
AsmApReleaseLock ();
+
+ ApDoLoop ((VOID *)CpuData);
}
/**
@@ -1346,5 +1395,9 @@ InitializeMpSupport (
InitMpSystemData ();
mAllApsInitFinished = TRUE;
+
+ while (mApDoneCount != (mNumberOfProcessors - 1)) {
+ CpuPause ();
+ };
}
--
1.9.3
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