/** @file

  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php.

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "DmaProtection.h"

UINT64                           mVtdHostAddressWidthMask;
UINTN                            mVtdUnitNumber;
VTD_UNIT_INFORMATION             *mVtdUnitInformation;

BOOLEAN  mVtdEnabled;

/**
  Flush VTD page table and context table memory.

  This action is to make sure the IOMMU engine can get final data in memory.

  @param[in]  VtdIndex          The index used to identify a VTd engine.
  @param[in]  Base              The base address of memory to be flushed.
  @param[in]  Size              The size of memory in bytes to be flushed.
**/
VOID
FlushPageTableMemory (
  IN UINTN  VtdIndex,
  IN UINTN  Base,
  IN UINTN  Size
  )
{
  if (mVtdUnitInformation[VtdIndex].ECapReg.Bits.C == 0) {
    WriteBackDataCacheRange ((VOID *)Base, Size);
  }
}

/**
  Flush VTd engine write buffer.

  @param[in]  VtdIndex          The index used to identify a VTd engine.
**/
VOID
FlushWriteBuffer (
  IN UINTN  VtdIndex
  )
{
  UINT32  Reg32;

  if (mVtdUnitInformation[VtdIndex].CapReg.Bits.RWBF != 0) {
    Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GSTS_REG);
    MmioWrite32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GCMD_REG, Reg32 | B_GMCD_REG_WBF);
    do {
      Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GSTS_REG);
    } while ((Reg32 & B_GSTS_REG_WBF) != 0);
  }
}

/**
  Invalidate VTd context cache.

  @param[in]  VtdIndex          The index used to identify a VTd engine.
**/
EFI_STATUS
InvalidateContextCache (
  IN UINTN  VtdIndex
  )
{
  UINT64  Reg64;

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_CCMD_REG);
  if ((Reg64 & B_CCMD_REG_ICC) != 0) {
    DEBUG ((DEBUG_ERROR,"ERROR: InvalidateContextCache: B_CCMD_REG_ICC is set for VTD(%d)\n",VtdIndex));
    return EFI_DEVICE_ERROR;
  }

  Reg64 &= ((~B_CCMD_REG_ICC) & (~B_CCMD_REG_CIRG_MASK));
  Reg64 |= (B_CCMD_REG_ICC | V_CCMD_REG_CIRG_GLOBAL);
  MmioWrite64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_CCMD_REG, Reg64);

  do {
    Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_CCMD_REG);
  } while ((Reg64 & B_CCMD_REG_ICC) != 0);

  return EFI_SUCCESS;
}

/**
  Invalidate VTd IOTLB.

  @param[in]  VtdIndex          The index used to identify a VTd engine.
**/
EFI_STATUS
InvalidateIOTLB (
  IN UINTN  VtdIndex
  )
{
  UINT64  Reg64;

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + (mVtdUnitInformation[VtdIndex].ECapReg.Bits.IRO * 16) + R_IOTLB_REG);
  if ((Reg64 & B_IOTLB_REG_IVT) != 0) {
    DEBUG ((DEBUG_ERROR,"ERROR: InvalidateIOTLB: B_IOTLB_REG_IVT is set for VTD(%d)\n", VtdIndex));
    return EFI_DEVICE_ERROR;
  }

  Reg64 &= ((~B_IOTLB_REG_IVT) & (~B_IOTLB_REG_IIRG_MASK));
  Reg64 |= (B_IOTLB_REG_IVT | V_IOTLB_REG_IIRG_GLOBAL);
  MmioWrite64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + (mVtdUnitInformation[VtdIndex].ECapReg.Bits.IRO * 16) + R_IOTLB_REG, Reg64);

  do {
    Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + (mVtdUnitInformation[VtdIndex].ECapReg.Bits.IRO * 16) + R_IOTLB_REG);
  } while ((Reg64 & B_IOTLB_REG_IVT) != 0);

  return EFI_SUCCESS;
}

/**
  Invalid VTd global IOTLB.

  @param[in]  VtdIndex              The index of VTd engine.

  @retval EFI_SUCCESS           VTd global IOTLB is invalidated.
  @retval EFI_DEVICE_ERROR      VTd global IOTLB is not invalidated.
**/
EFI_STATUS
InvalidateVtdIOTLBGlobal (
  IN UINTN  VtdIndex
  )
{
  if (!mVtdEnabled) {
    return EFI_SUCCESS;
  }

  DEBUG((DEBUG_VERBOSE, "InvalidateVtdIOTLBGlobal(%d)\n", VtdIndex));

  //
  // Write Buffer Flush before invalidation
  //
  FlushWriteBuffer (VtdIndex);

  //
  // Invalidate the context cache
  //
  if (mVtdUnitInformation[VtdIndex].HasDirtyContext) {
    InvalidateContextCache (VtdIndex);
  }

  //
  // Invalidate the IOTLB cache
  //
  if (mVtdUnitInformation[VtdIndex].HasDirtyContext || mVtdUnitInformation[VtdIndex].HasDirtyPages) {
    InvalidateIOTLB (VtdIndex);
  }

  return EFI_SUCCESS;
}

/**
  Prepare VTD configuration.
**/
VOID
PrepareVtdConfig (
  VOID
  )
{
  UINTN         Index;
  UINTN         DomainNumber;

  for (Index = 0; Index < mVtdUnitNumber; Index++) {
    DEBUG ((DEBUG_INFO, "Dump VTd Capability (%d)\n", Index));
    mVtdUnitInformation[Index].CapReg.Uint64 = MmioRead64 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_CAP_REG);
    DumpVtdCapRegs (&mVtdUnitInformation[Index].CapReg);
    mVtdUnitInformation[Index].ECapReg.Uint64 = MmioRead64 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_ECAP_REG);
    DumpVtdECapRegs (&mVtdUnitInformation[Index].ECapReg);

    if ((mVtdUnitInformation[Index].CapReg.Bits.SLLPS & BIT0) == 0) {
      DEBUG((DEBUG_WARN, "!!!! 2MB super page is not supported on VTD %d !!!!\n", Index));
    }
    if ((mVtdUnitInformation[Index].CapReg.Bits.SAGAW & BIT2) == 0) {
      DEBUG((DEBUG_ERROR, "!!!! 4-level page-table is not supported on VTD %d !!!!\n", Index));
      return ;
    }

    DomainNumber = (UINTN)1 << (UINT8)((UINTN)mVtdUnitInformation[Index].CapReg.Bits.ND * 2 + 4);
    if (mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceDataNumber >= DomainNumber) {
      DEBUG((DEBUG_ERROR, "!!!! Pci device Number(0x%x) >= DomainNumber(0x%x) !!!!\n", mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceDataNumber, DomainNumber));
      return ;
    }
  }
  return ;
}

/**
  Enable DMAR translation.

  @retval EFI_SUCCESS           DMAR translation is enabled.
  @retval EFI_DEVICE_ERROR      DMAR translation is not enabled.
**/
EFI_STATUS
EnableDmar (
  VOID
  )
{
  UINTN     Index;
  UINT32    Reg32;

  for (Index = 0; Index < mVtdUnitNumber; Index++) {
    DEBUG((DEBUG_INFO, ">>>>>>EnableDmar() for engine [%d] \n", Index));

    if (mVtdUnitInformation[Index].ExtRootEntryTable != NULL) {
      DEBUG((DEBUG_INFO, "ExtRootEntryTable 0x%x \n", mVtdUnitInformation[Index].ExtRootEntryTable));
      MmioWrite64 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_RTADDR_REG, (UINT64)(UINTN)mVtdUnitInformation[Index].ExtRootEntryTable | BIT11);
    } else {
      DEBUG((DEBUG_INFO, "RootEntryTable 0x%x \n", mVtdUnitInformation[Index].RootEntryTable));
      MmioWrite64 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_RTADDR_REG, (UINT64)(UINTN)mVtdUnitInformation[Index].RootEntryTable);
    }

    MmioWrite32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GCMD_REG, B_GMCD_REG_SRTP);

    DEBUG((DEBUG_INFO, "EnableDmar: waiting for RTPS bit to be set... \n"));
    do {
      Reg32 = MmioRead32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GSTS_REG);
    } while((Reg32 & B_GSTS_REG_RTPS) == 0);

    //
    // Init DMAr Fault Event and Data registers
    //
    Reg32 = MmioRead32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_FEDATA_REG);

    //
    // Write Buffer Flush before invalidation
    //
    FlushWriteBuffer (Index);

    //
    // Invalidate the context cache
    //
    InvalidateContextCache (Index);

    //
    // Invalidate the IOTLB cache
    //
    InvalidateIOTLB (Index);

    //
    // Enable VTd
    //
    MmioWrite32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GCMD_REG, B_GMCD_REG_TE);
    DEBUG((DEBUG_INFO, "EnableDmar: Waiting B_GSTS_REG_TE ...\n"));
    do {
      Reg32 = MmioRead32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GSTS_REG);
    } while ((Reg32 & B_GSTS_REG_TE) == 0);

    DEBUG ((DEBUG_INFO,"VTD (%d) enabled!<<<<<<\n",Index));
  }

  mVtdEnabled = TRUE;

  return EFI_SUCCESS;
}

/**
  Disable DMAR translation.

  @retval EFI_SUCCESS           DMAR translation is disabled.
  @retval EFI_DEVICE_ERROR      DMAR translation is not disabled.
**/
EFI_STATUS
DisableDmar (
  VOID
  )
{
  UINTN     Index;
  UINTN     SubIndex;
  UINT32    Reg32;

  for (Index = 0; Index < mVtdUnitNumber; Index++) {
    DEBUG((DEBUG_INFO, ">>>>>>DisableDmar() for engine [%d] \n", Index));

    //
    // Write Buffer Flush before invalidation
    //
    FlushWriteBuffer (Index);

    //
    // Disable VTd
    //
    MmioWrite32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GCMD_REG, B_GMCD_REG_SRTP);
    do {
      Reg32 = MmioRead32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GSTS_REG);
    } while((Reg32 & B_GSTS_REG_RTPS) == 0);

    Reg32 = MmioRead32 (mVtdUnitInformation[Index].VtdUnitBaseAddress + R_GSTS_REG);
    DEBUG((DEBUG_INFO, "DisableDmar: GSTS_REG - 0x%08x\n", Reg32));

    DEBUG ((DEBUG_INFO,"VTD (%d) Disabled!<<<<<<\n",Index));
  }

  mVtdEnabled = FALSE;

  for (Index = 0; Index < mVtdUnitNumber; Index++) {
    DEBUG((DEBUG_INFO, "engine [%d] access\n", Index));
    for (SubIndex = 0; SubIndex < mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceDataNumber; SubIndex++) {
      DEBUG ((DEBUG_INFO, "  PCI S%04X B%02x D%02x F%02x - %d\n",
        mVtdUnitInformation[Index].Segment,
        mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceData[Index].PciSourceId.Bits.Bus,
        mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceData[Index].PciSourceId.Bits.Device,
        mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceData[Index].PciSourceId.Bits.Function,
        mVtdUnitInformation[Index].PciDeviceInfo.PciDeviceData[Index].AccessCount
        ));
    }
  }

  return EFI_SUCCESS;
}

/**
  Dump VTd capability registers.

  @param[in]  CapReg              The capability register.
**/
VOID
DumpVtdCapRegs (
  IN VTD_CAP_REG *CapReg
  )
{
  DEBUG((DEBUG_INFO, "  CapReg:\n", CapReg->Uint64));
  DEBUG((DEBUG_INFO, "    ND     - 0x%x\n", CapReg->Bits.ND));
  DEBUG((DEBUG_INFO, "    AFL    - 0x%x\n", CapReg->Bits.AFL));
  DEBUG((DEBUG_INFO, "    RWBF   - 0x%x\n", CapReg->Bits.RWBF));
  DEBUG((DEBUG_INFO, "    PLMR   - 0x%x\n", CapReg->Bits.PLMR));
  DEBUG((DEBUG_INFO, "    PHMR   - 0x%x\n", CapReg->Bits.PHMR));
  DEBUG((DEBUG_INFO, "    CM     - 0x%x\n", CapReg->Bits.CM));
  DEBUG((DEBUG_INFO, "    SAGAW  - 0x%x\n", CapReg->Bits.SAGAW));
  DEBUG((DEBUG_INFO, "    MGAW   - 0x%x\n", CapReg->Bits.MGAW));
  DEBUG((DEBUG_INFO, "    ZLR    - 0x%x\n", CapReg->Bits.ZLR));
  DEBUG((DEBUG_INFO, "    FRO    - 0x%x\n", CapReg->Bits.FRO));
  DEBUG((DEBUG_INFO, "    SLLPS  - 0x%x\n", CapReg->Bits.SLLPS));
  DEBUG((DEBUG_INFO, "    PSI    - 0x%x\n", CapReg->Bits.PSI));
  DEBUG((DEBUG_INFO, "    NFR    - 0x%x\n", CapReg->Bits.NFR));
  DEBUG((DEBUG_INFO, "    MAMV   - 0x%x\n", CapReg->Bits.MAMV));
  DEBUG((DEBUG_INFO, "    DWD    - 0x%x\n", CapReg->Bits.DWD));
  DEBUG((DEBUG_INFO, "    DRD    - 0x%x\n", CapReg->Bits.DRD));
  DEBUG((DEBUG_INFO, "    FL1GP  - 0x%x\n", CapReg->Bits.FL1GP));
  DEBUG((DEBUG_INFO, "    PI     - 0x%x\n", CapReg->Bits.PI));
}

/**
  Dump VTd extended capability registers.

  @param[in]  ECapReg              The extended capability register.
**/
VOID
DumpVtdECapRegs (
  IN VTD_ECAP_REG *ECapReg
  )
{
  DEBUG((DEBUG_INFO, "  ECapReg:\n", ECapReg->Uint64));
  DEBUG((DEBUG_INFO, "    C      - 0x%x\n", ECapReg->Bits.C));
  DEBUG((DEBUG_INFO, "    QI     - 0x%x\n", ECapReg->Bits.QI));
  DEBUG((DEBUG_INFO, "    DT     - 0x%x\n", ECapReg->Bits.DT));
  DEBUG((DEBUG_INFO, "    IR     - 0x%x\n", ECapReg->Bits.IR));
  DEBUG((DEBUG_INFO, "    EIM    - 0x%x\n", ECapReg->Bits.EIM));
  DEBUG((DEBUG_INFO, "    PT     - 0x%x\n", ECapReg->Bits.PT));
  DEBUG((DEBUG_INFO, "    SC     - 0x%x\n", ECapReg->Bits.SC));
  DEBUG((DEBUG_INFO, "    IRO    - 0x%x\n", ECapReg->Bits.IRO));
  DEBUG((DEBUG_INFO, "    MHMV   - 0x%x\n", ECapReg->Bits.MHMV));
  DEBUG((DEBUG_INFO, "    ECS    - 0x%x\n", ECapReg->Bits.ECS));
  DEBUG((DEBUG_INFO, "    MTS    - 0x%x\n", ECapReg->Bits.MTS));
  DEBUG((DEBUG_INFO, "    NEST   - 0x%x\n", ECapReg->Bits.NEST));
  DEBUG((DEBUG_INFO, "    DIS    - 0x%x\n", ECapReg->Bits.DIS));
  DEBUG((DEBUG_INFO, "    PASID  - 0x%x\n", ECapReg->Bits.PASID));
  DEBUG((DEBUG_INFO, "    PRS    - 0x%x\n", ECapReg->Bits.PRS));
  DEBUG((DEBUG_INFO, "    ERS    - 0x%x\n", ECapReg->Bits.ERS));
  DEBUG((DEBUG_INFO, "    SRS    - 0x%x\n", ECapReg->Bits.SRS));
  DEBUG((DEBUG_INFO, "    NWFS   - 0x%x\n", ECapReg->Bits.NWFS));
  DEBUG((DEBUG_INFO, "    EAFS   - 0x%x\n", ECapReg->Bits.EAFS));
  DEBUG((DEBUG_INFO, "    PSS    - 0x%x\n", ECapReg->Bits.PSS));
}

/**
  Dump VTd registers.

  @param[in]  VtdIndex              The index of VTd engine.
**/
VOID
DumpVtdRegs (
  IN UINTN  VtdIndex
  )
{
  UINTN         Index;
  UINT64        Reg64;
  VTD_FRCD_REG  FrcdReg;
  VTD_CAP_REG   CapReg;
  UINT32        Reg32;
  VTD_SOURCE_ID SourceId;

  DEBUG((DEBUG_INFO, "#### DumpVtdRegs(%d) Begin ####\n", VtdIndex));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_VER_REG);
  DEBUG((DEBUG_INFO, "  VER_REG     - 0x%08x\n", Reg32));

  CapReg.Uint64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_CAP_REG);
  DEBUG((DEBUG_INFO, "  CAP_REG     - 0x%016lx\n", CapReg.Uint64));

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_ECAP_REG);
  DEBUG((DEBUG_INFO, "  ECAP_REG    - 0x%016lx\n", Reg64));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_GSTS_REG);
  DEBUG((DEBUG_INFO, "  GSTS_REG    - 0x%08x \n", Reg32));

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_RTADDR_REG);
  DEBUG((DEBUG_INFO, "  RTADDR_REG  - 0x%016lx\n", Reg64));

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_CCMD_REG);
  DEBUG((DEBUG_INFO, "  CCMD_REG    - 0x%016lx\n", Reg64));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_FSTS_REG);
  DEBUG((DEBUG_INFO, "  FSTS_REG    - 0x%08x\n", Reg32));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_FECTL_REG);
  DEBUG((DEBUG_INFO, "  FECTL_REG   - 0x%08x\n", Reg32));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_FEDATA_REG);
  DEBUG((DEBUG_INFO, "  FEDATA_REG  - 0x%08x\n", Reg32));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_FEADDR_REG);
  DEBUG((DEBUG_INFO, "  FEADDR_REG  - 0x%08x\n",Reg32));

  Reg32 = MmioRead32 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + R_FEUADDR_REG);
  DEBUG((DEBUG_INFO, "  FEUADDR_REG - 0x%08x\n",Reg32));

  for (Index = 0; Index < (UINTN)CapReg.Bits.NFR + 1; Index++) {
    FrcdReg.Uint64[0] = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG));
    FrcdReg.Uint64[1] = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG + sizeof(UINT64)));
    DEBUG((DEBUG_INFO, "  FRCD_REG[%d] - 0x%016lx %016lx\n", Index, FrcdReg.Uint64[1], FrcdReg.Uint64[0]));
    if (FrcdReg.Uint64[1] != 0 || FrcdReg.Uint64[0] != 0) {
      DEBUG((DEBUG_INFO, "    Fault Info - 0x%016lx\n", VTD_64BITS_ADDRESS(FrcdReg.Bits.FILo, FrcdReg.Bits.FIHi)));
      SourceId.Uint16 = (UINT16)FrcdReg.Bits.SID;
      DEBUG((DEBUG_INFO, "    Source - B%02x D%02x F%02x\n", SourceId.Bits.Bus, SourceId.Bits.Device, SourceId.Bits.Function));
      DEBUG((DEBUG_INFO, "    Type - %x (%a)\n", FrcdReg.Bits.T, FrcdReg.Bits.T ? "read" : "write"));
      DEBUG((DEBUG_INFO, "    Reason - %x\n", FrcdReg.Bits.FR));
    }
  }

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + (mVtdUnitInformation[VtdIndex].ECapReg.Bits.IRO * 16) + R_IVA_REG);
  DEBUG((DEBUG_INFO, "  IVA_REG     - 0x%016lx\n",Reg64));

  Reg64 = MmioRead64 (mVtdUnitInformation[VtdIndex].VtdUnitBaseAddress + (mVtdUnitInformation[VtdIndex].ECapReg.Bits.IRO * 16) + R_IOTLB_REG);
  DEBUG((DEBUG_INFO, "  IOTLB_REG   - 0x%016lx\n",Reg64));

  DEBUG((DEBUG_INFO, "#### DumpVtdRegs(%d) End ####\n", VtdIndex));
}

/**
  Dump VTd registers for all VTd engine.
**/
VOID
DumpVtdRegsAll (
  VOID
  )
{
  UINTN       Num;

  for (Num = 0; Num < mVtdUnitNumber; Num++) {
    DumpVtdRegs (Num);
  }
}

/**
  Dump VTd registers if there is error.
**/
VOID
DumpVtdIfError (
  VOID
  )
{
  UINTN         Num;
  UINTN         Index;
  VTD_FRCD_REG  FrcdReg;
  VTD_CAP_REG   CapReg;
  UINT32        Reg32;
  BOOLEAN       HasError;

  for (Num = 0; Num < mVtdUnitNumber; Num++) {
    HasError = FALSE;
    Reg32 = MmioRead32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FSTS_REG);
    if (Reg32 != 0) {
      HasError = TRUE;
    }
    Reg32 = MmioRead32 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_FECTL_REG);
    if ((Reg32 & BIT30) != 0) {
      HasError = TRUE;
    }

    CapReg.Uint64 = MmioRead64 (mVtdUnitInformation[Num].VtdUnitBaseAddress + R_CAP_REG);
    for (Index = 0; Index < (UINTN)CapReg.Bits.NFR + 1; Index++) {
      FrcdReg.Uint64[0] = MmioRead64 (mVtdUnitInformation[Num].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG));
      FrcdReg.Uint64[1] = MmioRead64 (mVtdUnitInformation[Num].VtdUnitBaseAddress + ((CapReg.Bits.FRO * 16) + (Index * 16) + R_FRCD_REG + sizeof(UINT64)));
      if ((FrcdReg.Uint64[0] != 0) || (FrcdReg.Uint64[1] != 0)) {
        HasError = TRUE;
      }
    }

    if (HasError) {
      DEBUG((DEBUG_INFO, "\n#### ERROR ####\n"));
      DumpVtdRegs (Num);
      DEBUG((DEBUG_INFO, "#### ERROR ####\n\n"));
    }
  }
}
