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/** @file
CPU Register Table Library functions.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include "RegisterCpuFeatures.h"
CPU_FEATURES_DATA mCpuFeaturesData = {0};
/**
Worker function to get CPU_FEATURES_DATA pointer.
@return Pointer to CPU_FEATURES_DATA.
**/
CPU_FEATURES_DATA *
GetCpuFeaturesData (
VOID
)
{
return &mCpuFeaturesData;
}
/**
Worker function to get EFI_MP_SERVICES_PROTOCOL pointer.
@return MP_SERVICES variable.
**/
MP_SERVICES
GetMpService (
VOID
)
{
EFI_STATUS Status;
MP_SERVICES MpService;
//
// Get MP Services Protocol
//
Status = gBS->LocateProtocol (
&gEfiMpServiceProtocolGuid,
NULL,
(VOID **)&MpService.Protocol
);
ASSERT_EFI_ERROR (Status);
return MpService;
}
/**
Worker function to return processor index.
@param CpuFeaturesData Cpu Feature Data structure.
@return The processor index.
**/
UINTN
GetProcessorIndex (
IN CPU_FEATURES_DATA *CpuFeaturesData
)
{
EFI_STATUS Status;
UINTN ProcessorIndex;
EFI_MP_SERVICES_PROTOCOL *MpServices;
MpServices = CpuFeaturesData->MpService.Protocol;
Status = MpServices->WhoAmI(MpServices, &ProcessorIndex);
ASSERT_EFI_ERROR (Status);
return ProcessorIndex;
}
/**
Gets detailed MP-related information on the requested processor at the
instant this call is made.
@param[in] ProcessorNumber The handle number of processor.
@param[out] ProcessorInfoBuffer A pointer to the buffer where information for
the requested processor is deposited.
@return Status of MpServices->GetProcessorInfo().
**/
EFI_STATUS
GetProcessorInformation (
IN UINTN ProcessorNumber,
OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer
)
{
EFI_STATUS Status;
EFI_MP_SERVICES_PROTOCOL *MpServices;
CPU_FEATURES_DATA *CpuFeaturesData;
CpuFeaturesData = GetCpuFeaturesData ();
MpServices = CpuFeaturesData->MpService.Protocol;
Status = MpServices->GetProcessorInfo (
MpServices,
ProcessorNumber,
ProcessorInfoBuffer
);
return Status;
}
/**
Worker function to execute a caller provided function on all enabled APs.
@param[in] Procedure A pointer to the function to be run on
enabled APs of the system.
@param[in] MpEvent A pointer to the event to be used later
to check whether procedure has done.
**/
VOID
StartupAPsWorker (
IN EFI_AP_PROCEDURE Procedure,
IN EFI_EVENT MpEvent
)
{
EFI_STATUS Status;
EFI_MP_SERVICES_PROTOCOL *MpServices;
CPU_FEATURES_DATA *CpuFeaturesData;
CpuFeaturesData = GetCpuFeaturesData ();
MpServices = CpuFeaturesData->MpService.Protocol;
//
// Wakeup all APs
//
Status = MpServices->StartupAllAPs (
MpServices,
Procedure,
FALSE,
MpEvent,
0,
CpuFeaturesData,
NULL
);
ASSERT_EFI_ERROR (Status);
}
/**
Worker function to switch the requested AP to be the BSP from that point onward.
@param[in] ProcessorNumber The handle number of AP that is to become the new BSP.
**/
VOID
SwitchNewBsp (
IN UINTN ProcessorNumber
)
{
EFI_STATUS Status;
EFI_MP_SERVICES_PROTOCOL *MpServices;
CPU_FEATURES_DATA *CpuFeaturesData;
CpuFeaturesData = GetCpuFeaturesData ();
MpServices = CpuFeaturesData->MpService.Protocol;
//
// Wakeup all APs
//
Status = MpServices->SwitchBSP (
MpServices,
ProcessorNumber,
TRUE
);
ASSERT_EFI_ERROR (Status);
}
/**
Worker function to retrieve the number of logical processor in the platform.
@param[out] NumberOfCpus Pointer to the total number of logical
processors in the system, including the BSP
and disabled APs.
@param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical
processors that exist in system, including
the BSP.
**/
VOID
GetNumberOfProcessor (
OUT UINTN *NumberOfCpus,
OUT UINTN *NumberOfEnabledProcessors
)
{
EFI_STATUS Status;
EFI_MP_SERVICES_PROTOCOL *MpServices;
CPU_FEATURES_DATA *CpuFeaturesData;
CpuFeaturesData = GetCpuFeaturesData ();
MpServices = CpuFeaturesData->MpService.Protocol;
//
// Get the number of CPUs
//
Status = MpServices->GetNumberOfProcessors (
MpServices,
NumberOfCpus,
NumberOfEnabledProcessors
);
ASSERT_EFI_ERROR (Status);
}
/**
Performs CPU features Initialization.
This service will invoke MP service to perform CPU features
initialization on BSP/APs per user configuration.
@note This service could be called by BSP only.
**/
VOID
EFIAPI
CpuFeaturesInitialize (
VOID
)
{
CPU_FEATURES_DATA *CpuFeaturesData;
UINTN OldBspNumber;
EFI_EVENT MpEvent;
EFI_STATUS Status;
CpuFeaturesData = GetCpuFeaturesData ();
OldBspNumber = GetProcessorIndex (CpuFeaturesData);
CpuFeaturesData->BspNumber = OldBspNumber;
Status = gBS->CreateEvent (
EVT_NOTIFY_WAIT,
TPL_CALLBACK,
EfiEventEmptyFunction,
NULL,
&MpEvent
);
ASSERT_EFI_ERROR (Status);
//
// Wakeup all APs for programming.
//
StartupAPsWorker (SetProcessorRegister, MpEvent);
//
// Programming BSP
//
SetProcessorRegister (CpuFeaturesData);
//
// Wait all processors to finish the task.
//
do {
Status = gBS->CheckEvent (MpEvent);
} while (Status == EFI_NOT_READY);
ASSERT_EFI_ERROR (Status);
//
// Switch to new BSP if required
//
if (CpuFeaturesData->BspNumber != OldBspNumber) {
SwitchNewBsp (CpuFeaturesData->BspNumber);
}
}
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