/** @file
  CPU Register Table Library functions.

  Copyright (c) 2016 - 2020, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <PiPei.h>

#include <Library/HobLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/PeiServicesTablePointerLib.h>
#include <Ppi/MpServices2.h>

#include "RegisterCpuFeatures.h"

#define REGISTER_CPU_FEATURES_GUID \
  { \
    0xa694c467, 0x697a, 0x446b, { 0xb9, 0x29, 0x5b, 0x14, 0xa0, 0xcf, 0x39, 0xf } \
  }

EFI_GUID  mRegisterCpuFeaturesHobGuid = REGISTER_CPU_FEATURES_GUID;

/**
  Worker function to get CPU_FEATURES_DATA pointer.

  @return Pointer to CPU_FEATURES_DATA.
**/
CPU_FEATURES_DATA *
GetCpuFeaturesData (
  VOID
  )
{
  CPU_FEATURES_DATA  *CpuInitData;
  EFI_HOB_GUID_TYPE  *GuidHob;
  VOID               *DataInHob;
  UINT64             Data64;

  CpuInitData = NULL;
  GuidHob     = GetFirstGuidHob (&mRegisterCpuFeaturesHobGuid);
  if (GuidHob != NULL) {
    DataInHob   = GET_GUID_HOB_DATA (GuidHob);
    CpuInitData = (CPU_FEATURES_DATA *)(*(UINTN *)DataInHob);
    ASSERT (CpuInitData != NULL);
  } else {
    CpuInitData = AllocateZeroPool (sizeof (CPU_FEATURES_DATA));
    ASSERT (CpuInitData != NULL);
    //
    // Build location of CPU MP DATA buffer in HOB
    //
    Data64 = (UINT64)(UINTN)CpuInitData;
    BuildGuidDataHob (
      &mRegisterCpuFeaturesHobGuid,
      (VOID *)&Data64,
      sizeof (UINT64)
      );
  }

  return CpuInitData;
}

/**
  Worker function to get MP PPI service pointer.

  @return MP_SERVICES variable.
**/
MP_SERVICES
GetMpService (
  VOID
  )
{
  EFI_STATUS   Status;
  MP_SERVICES  MpService;

  //
  // Get MP Services2 Ppi
  //
  Status = PeiServicesLocatePpi (
             &gEdkiiPeiMpServices2PpiGuid,
             0,
             NULL,
             (VOID **)&MpService.Ppi
             );
  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;
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  UINTN                       ProcessorIndex;

  CpuMp2Ppi = CpuFeaturesData->MpService.Ppi;

  //
  // For two reasons which use NULL for WhoAmI:
  // 1. This function will be called by APs and AP should not use PeiServices Table
  // 2. Check WhoAmI implementation, this parameter will not be used.
  //
  Status = CpuMp2Ppi->WhoAmI (CpuMp2Ppi, &ProcessorIndex);
  ASSERT_EFI_ERROR (Status);
  return ProcessorIndex;
}

/**
  Worker function to 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
  )
{
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  EFI_STATUS                  Status;
  CPU_FEATURES_DATA           *CpuFeaturesData;

  CpuFeaturesData = GetCpuFeaturesData ();
  CpuMp2Ppi       = CpuFeaturesData->MpService.Ppi;

  Status = CpuMp2Ppi->GetProcessorInfo (
                        CpuMp2Ppi,
                        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                 The Event used to sync the result.

**/
VOID
StartupAllAPsWorker (
  IN  EFI_AP_PROCEDURE  Procedure,
  IN  EFI_EVENT         MpEvent
  )
{
  EFI_STATUS                  Status;
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  CPU_FEATURES_DATA           *CpuFeaturesData;

  CpuFeaturesData = GetCpuFeaturesData ();
  CpuMp2Ppi       = CpuFeaturesData->MpService.Ppi;

  //
  // Wakeup all APs for data collection.
  //
  Status = CpuMp2Ppi->StartupAllAPs (
                        CpuMp2Ppi,
                        Procedure,
                        FALSE,
                        0,
                        CpuFeaturesData
                        );
  ASSERT_EFI_ERROR (Status);
}

/**
  Worker function to execute a caller provided function on all enabled CPUs.

  @param[in]  Procedure               A pointer to the function to be run on
                                      enabled CPUs of the system.

**/
VOID
StartupAllCPUsWorker (
  IN  EFI_AP_PROCEDURE  Procedure
  )
{
  EFI_STATUS                  Status;
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  CPU_FEATURES_DATA           *CpuFeaturesData;

  CpuFeaturesData = GetCpuFeaturesData ();

  //
  // Get MP Services2 Ppi
  //
  CpuMp2Ppi = CpuFeaturesData->MpService.Ppi;
  Status    = CpuMp2Ppi->StartupAllCPUs (
                           CpuMp2Ppi,
                           Procedure,
                           0,
                           CpuFeaturesData
                           );
  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;
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  CPU_FEATURES_DATA           *CpuFeaturesData;

  CpuFeaturesData = GetCpuFeaturesData ();
  CpuMp2Ppi       = CpuFeaturesData->MpService.Ppi;

  //
  // Wakeup all APs for data collection.
  //
  Status = CpuMp2Ppi->SwitchBSP (
                        CpuMp2Ppi,
                        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;
  EDKII_PEI_MP_SERVICES2_PPI  *CpuMp2Ppi;
  CPU_FEATURES_DATA           *CpuFeaturesData;

  CpuFeaturesData = GetCpuFeaturesData ();
  CpuMp2Ppi       = CpuFeaturesData->MpService.Ppi;

  //
  // Get the number of CPUs
  //
  Status = CpuMp2Ppi->GetNumberOfProcessors (
                        CpuMp2Ppi,
                        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;

  CpuFeaturesData = GetCpuFeaturesData ();

  OldBspNumber               = GetProcessorIndex (CpuFeaturesData);
  CpuFeaturesData->BspNumber = OldBspNumber;

  //
  // Start to program register for all CPUs.
  //
  StartupAllCPUsWorker (SetProcessorRegister);

  //
  // Switch to new BSP if required
  //
  if (CpuFeaturesData->BspNumber != OldBspNumber) {
    SwitchNewBsp (CpuFeaturesData->BspNumber);
  }
}