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/** @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 <PiPei.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <IndustryStandard/Vtd.h>
#include <Ppi/VtdInfo.h>
#include "IntelVTdPmrPei.h"
extern EDKII_VTD_INFO_PPI *mVTdInfoPpi;
/**
Get protected low memory alignment.
@param VtdUnitBaseAddress The base address of the VTd engine.
@return protected low memory alignment.
**/
UINT32
GetPlmrAlignment (
IN UINTN VtdUnitBaseAddress
)
{
UINT32 Data32;
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_LOW_BASE_REG, 0xFFFFFFFF);
Data32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_LOW_BASE_REG);
Data32 = ~Data32 + 1;
return Data32;
}
/**
Get protected high memory alignment.
@param VtdUnitBaseAddress The base address of the VTd engine.
@return protected high memory alignment.
**/
UINT64
GetPhmrAlignment (
IN UINTN VtdUnitBaseAddress
)
{
UINT64 Data64;
UINT8 HostAddressWidth;
HostAddressWidth = mVTdInfoPpi->HostAddressWidth;
MmioWrite64 (VtdUnitBaseAddress + R_PMEN_HIGH_BASE_REG, 0xFFFFFFFFFFFFFFFF);
Data64 = MmioRead64 (VtdUnitBaseAddress + R_PMEN_HIGH_BASE_REG);
Data64 = ~Data64 + 1;
Data64 = Data64 & (LShiftU64 (1, HostAddressWidth) - 1);
return Data64;
}
/**
Get protected low memory alignment.
@return protected low memory alignment.
**/
UINT32
GetLowMemoryAlignment (
VOID
)
{
UINTN Index;
UINT32 Alignment;
UINT32 FinalAlignment;
FinalAlignment = 0;
for (Index = 0; Index < mVTdInfoPpi->VTdEngineCount; Index++) {
Alignment = GetPlmrAlignment ((UINTN)mVTdInfoPpi->VTdEngineAddress[Index]);
if (FinalAlignment < Alignment) {
FinalAlignment = Alignment;
}
}
return FinalAlignment;
}
/**
Get protected high memory alignment.
@return protected high memory alignment.
**/
UINT64
GetHighMemoryAlignment (
VOID
)
{
UINTN Index;
UINT64 Alignment;
UINT64 FinalAlignment;
FinalAlignment = 0;
for (Index = 0; Index < mVTdInfoPpi->VTdEngineCount; Index++) {
Alignment = GetPhmrAlignment ((UINTN)mVTdInfoPpi->VTdEngineAddress[Index]);
if (FinalAlignment < Alignment) {
FinalAlignment = Alignment;
}
}
return FinalAlignment;
}
/**
Enable PMR in the VTd engine.
@param VtdUnitBaseAddress The base address of the VTd engine.
@retval EFI_SUCCESS The PMR is enabled.
@retval EFI_UNSUPPORTED The PMR is not supported.
**/
EFI_STATUS
EnablePmr (
IN UINTN VtdUnitBaseAddress
)
{
UINT32 Reg32;
VTD_CAP_REG CapReg;
CapReg.Uint64 = MmioRead64 (VtdUnitBaseAddress + R_CAP_REG);
if (CapReg.Bits.PLMR == 0 || CapReg.Bits.PHMR == 0) {
return EFI_UNSUPPORTED;
}
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
if ((Reg32 & BIT0) == 0) {
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG, BIT31);
do {
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
} while((Reg32 & BIT0) == 0);
}
return EFI_SUCCESS;
}
/**
Disable PMR in the VTd engine.
@param VtdUnitBaseAddress The base address of the VTd engine.
@retval EFI_SUCCESS The PMR is disabled.
@retval EFI_UNSUPPORTED The PMR is not supported.
**/
EFI_STATUS
DisablePmr (
IN UINTN VtdUnitBaseAddress
)
{
UINT32 Reg32;
VTD_CAP_REG CapReg;
CapReg.Uint64 = MmioRead64 (VtdUnitBaseAddress + R_CAP_REG);
if (CapReg.Bits.PLMR == 0 || CapReg.Bits.PHMR == 0) {
return EFI_UNSUPPORTED;
}
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
if ((Reg32 & BIT0) != 0) {
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG, 0x0);
do {
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
} while((Reg32 & BIT0) != 0);
}
return EFI_SUCCESS;
}
/**
Set PMR region in the VTd engine.
@param VtdUnitBaseAddress The base address of the VTd engine.
@param LowMemoryBase The protected low memory region base.
@param LowMemoryLength The protected low memory region length.
@param HighMemoryBase The protected high memory region base.
@param HighMemoryLength The protected high memory region length.
@retval EFI_SUCCESS The PMR is set to protected region.
@retval EFI_UNSUPPORTED The PMR is not supported.
**/
EFI_STATUS
SetPmrRegion (
IN UINTN VtdUnitBaseAddress,
IN UINT32 LowMemoryBase,
IN UINT32 LowMemoryLength,
IN UINT64 HighMemoryBase,
IN UINT64 HighMemoryLength
)
{
VTD_CAP_REG CapReg;
UINT32 PlmrAlignment;
UINT64 PhmrAlignment;
DEBUG ((DEBUG_INFO, "VtdUnitBaseAddress - 0x%x\n", VtdUnitBaseAddress));
CapReg.Uint64 = MmioRead64 (VtdUnitBaseAddress + R_CAP_REG);
if (CapReg.Bits.PLMR == 0 || CapReg.Bits.PHMR == 0) {
DEBUG ((DEBUG_ERROR, "PLMR/PHMR unsupported\n"));
return EFI_UNSUPPORTED;
}
PlmrAlignment = GetPlmrAlignment (VtdUnitBaseAddress);
DEBUG ((DEBUG_INFO, "PlmrAlignment - 0x%x\n", PlmrAlignment));
PhmrAlignment = GetPhmrAlignment (VtdUnitBaseAddress);
DEBUG ((DEBUG_INFO, "PhmrAlignment - 0x%lx\n", PhmrAlignment));
if ((LowMemoryBase != ALIGN_VALUE(LowMemoryBase, PlmrAlignment)) ||
(LowMemoryLength != ALIGN_VALUE(LowMemoryLength, PlmrAlignment)) ||
(HighMemoryBase != ALIGN_VALUE(HighMemoryBase, PhmrAlignment)) ||
(HighMemoryLength != ALIGN_VALUE(HighMemoryLength, PhmrAlignment))) {
DEBUG ((DEBUG_ERROR, "PLMR/PHMR alignment issue\n"));
return EFI_UNSUPPORTED;
}
if (LowMemoryBase == 0 && LowMemoryLength == 0) {
LowMemoryBase = 0xFFFFFFFF;
}
if (HighMemoryBase == 0 && HighMemoryLength == 0) {
HighMemoryBase = 0xFFFFFFFFFFFFFFFF;
}
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_LOW_BASE_REG, LowMemoryBase);
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_LOW_LIMITE_REG, LowMemoryBase + LowMemoryLength - 1);
MmioWrite64 (VtdUnitBaseAddress + R_PMEN_HIGH_BASE_REG, HighMemoryBase);
MmioWrite64 (VtdUnitBaseAddress + R_PMEN_HIGH_LIMITE_REG, HighMemoryBase + HighMemoryLength - 1);
return EFI_SUCCESS;
}
/**
Set DMA protected region.
@param LowMemoryBase The protected low memory region base.
@param LowMemoryLength The protected low memory region length.
@param HighMemoryBase The protected high memory region base.
@param HighMemoryLength The protected high memory region length.
@retval EFI_SUCCESS The DMA protection is set.
@retval EFI_UNSUPPORTED The DMA protection is not set.
**/
EFI_STATUS
SetDmaProtectedRange (
IN UINT32 LowMemoryBase,
IN UINT32 LowMemoryLength,
IN UINT64 HighMemoryBase,
IN UINT64 HighMemoryLength
)
{
UINTN Index;
EFI_STATUS Status;
DEBUG ((DEBUG_INFO, "SetDmaProtectedRange - [0x%x, 0x%x] [0x%lx, 0x%lx]\n", LowMemoryBase, LowMemoryLength, HighMemoryBase, HighMemoryLength));
for (Index = 0; Index < mVTdInfoPpi->VTdEngineCount; Index++) {
DisablePmr ((UINTN)mVTdInfoPpi->VTdEngineAddress[Index]);
Status = SetPmrRegion (
(UINTN)mVTdInfoPpi->VTdEngineAddress[Index],
LowMemoryBase,
LowMemoryLength,
HighMemoryBase,
HighMemoryLength
);
if (EFI_ERROR(Status)) {
return Status;
}
Status = EnablePmr ((UINTN)mVTdInfoPpi->VTdEngineAddress[Index]);
if (EFI_ERROR(Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
/**
Diable DMA protection.
@retval DMA protection is disabled.
**/
EFI_STATUS
DisableDmaProtection (
VOID
)
{
UINTN Index;
EFI_STATUS Status;
DEBUG ((DEBUG_INFO, "DisableDmaProtection\n"));
for (Index = 0; Index < mVTdInfoPpi->VTdEngineCount; Index++) {
Status = DisablePmr ((UINTN)mVTdInfoPpi->VTdEngineAddress[Index]);
if (EFI_ERROR(Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
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