CollectProcessorCount() will send the 1st INIT-SIPI-SIPI to get processor count
in system.
Cc: Michael Kinney <michael.d.kin...@intel.com>
Cc: Feng Tian <feng.t...@intel.com>
Cc: Giri P Mudusuru <giri.p.mudus...@intel.com>
Cc: Laszlo Ersek <ler...@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff....@intel.com>
---
UefiCpuPkg/Library/MpInitLib/MpLib.c | 40 ++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index 8a333db..2ada3c8 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -273,6 +273,42 @@ GetProcessorNumber (
return EFI_NOT_FOUND;
}
+/**
+ This function will get CPU count in the system.
+
+ @param[in] CpuMpData Pointer to PEI CPU MP Data
+
+ @return CPU count detected
+**/
+UINTN
+CollectProcessorCount (
+ IN CPU_MP_DATA *CpuMpData
+ )
+{
+ //
+ // Send 1st broadcast IPI to APs to wakeup APs
+ //
+ CpuMpData->InitFlag = ApInitConfig;
+ CpuMpData->X2ApicEnable = FALSE;
+ WakeUpAP (CpuMpData, TRUE, 0, NULL, NULL);
+ //
+ // Wait for AP task to complete and then exit.
+ //
+ MicroSecondDelay (PcdGet32(PcdCpuApInitTimeOutInMicroSeconds));
+ CpuMpData->InitFlag = ApInitDone;
+ ASSERT (CpuMpData->CpuCount <= PcdGet32 (PcdCpuMaxLogicalProcessorNumber));
+ //
+ // Wait for all APs finished the initialization
+ //
+ while (CpuMpData->FinishedCount < (CpuMpData->CpuCount - 1)) {
+ CpuPause ();
+ }
+
+ DEBUG ((DEBUG_INFO, "MpInitLib: Find %d processors in system.\n",
CpuMpData->CpuCount));
+
+ return CpuMpData->CpuCount;
+}
+
/*
Initialize CPU AP Data when AP is wakeup at the first time.
@@ -710,6 +746,10 @@ MpInitLibInitialize (
//
+ // Wakeup all APs and calculate the processor count in system
+ //
+ CollectProcessorCount (CpuMpData);
+ //
// Initialize global data for MP support
//
InitMpGlobalData (CpuMpData);
--
2.7.4.windows.1
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