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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"
/**
Get protected low memory alignment.
@param HostAddressWidth The host address width.
@param VtdUnitBaseAddress The base address of the VTd engine.
@return protected low memory alignment.
**/
UINT32
GetPlmrAlignment (
IN UINT8 HostAddressWidth,
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 HostAddressWidth The host address width.
@param VtdUnitBaseAddress The base address of the VTd engine.
@return protected high memory alignment.
**/
UINT64
GetPhmrAlignment (
IN UINT8 HostAddressWidth,
IN UINTN VtdUnitBaseAddress
)
{
UINT64 Data64;
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.
@param VTdInfo The VTd engine context information.
@param EngineMask The mask of the VTd engine to be accessed.
@return protected low memory alignment.
**/
UINT32
GetLowMemoryAlignment (
IN VTD_INFO *VTdInfo,
IN UINT64 EngineMask
)
{
UINTN Index;
UINT32 Alignment;
UINT32 FinalAlignment;
FinalAlignment = 0;
for (Index = 0; Index < VTdInfo->VTdEngineCount; Index++) {
if ((EngineMask & LShiftU64(1, Index)) == 0) {
continue;
}
Alignment = GetPlmrAlignment (VTdInfo->HostAddressWidth, (UINTN)VTdInfo->VTdEngineAddress[Index]);
if (FinalAlignment < Alignment) {
FinalAlignment = Alignment;
}
}
return FinalAlignment;
}
/**
Get protected high memory alignment.
@param VTdInfo The VTd engine context information.
@param EngineMask The mask of the VTd engine to be accessed.
@return protected high memory alignment.
**/
UINT64
GetHighMemoryAlignment (
IN VTD_INFO *VTdInfo,
IN UINT64 EngineMask
)
{
UINTN Index;
UINT64 Alignment;
UINT64 FinalAlignment;
FinalAlignment = 0;
for (Index = 0; Index < VTdInfo->VTdEngineCount; Index++) {
if ((EngineMask & LShiftU64(1, Index)) == 0) {
continue;
}
Alignment = GetPhmrAlignment (VTdInfo->HostAddressWidth, (UINTN)VTdInfo->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;
DEBUG ((DEBUG_INFO, "EnablePmr - %x\n", VtdUnitBaseAddress));
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 == 0xFFFFFFFF) {
DEBUG ((DEBUG_ERROR, "R_PMEN_ENABLE_REG - 0x%x\n", Reg32));
ASSERT(FALSE);
}
if ((Reg32 & BIT0) == 0) {
MmioWrite32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG, BIT31);
do {
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
} while((Reg32 & BIT0) == 0);
}
DEBUG ((DEBUG_INFO, "EnablePmr - Done\n"));
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 == 0xFFFFFFFF) {
DEBUG ((DEBUG_ERROR, "R_PMEN_ENABLE_REG - 0x%x\n", Reg32));
ASSERT(FALSE);
}
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 HostAddressWidth The host address width.
@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 UINT8 HostAddressWidth,
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 (HostAddressWidth, VtdUnitBaseAddress);
DEBUG ((DEBUG_INFO, "PlmrAlignment - 0x%x\n", PlmrAlignment));
PhmrAlignment = GetPhmrAlignment (HostAddressWidth, 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);
DEBUG ((DEBUG_INFO, "PLMR set done\n"));
MmioWrite64 (VtdUnitBaseAddress + R_PMEN_HIGH_BASE_REG, HighMemoryBase);
MmioWrite64 (VtdUnitBaseAddress + R_PMEN_HIGH_LIMITE_REG, HighMemoryBase + HighMemoryLength - 1);
DEBUG ((DEBUG_INFO, "PHMR set done\n"));
return EFI_SUCCESS;
}
/**
Set DMA protected region.
@param VTdInfo The VTd engine context information.
@param EngineMask The mask of the VTd engine to be accessed.
@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 VTD_INFO *VTdInfo,
IN UINT64 EngineMask,
IN UINT32 LowMemoryBase,
IN UINT32 LowMemoryLength,
IN UINT64 HighMemoryBase,
IN UINT64 HighMemoryLength
)
{
UINTN Index;
EFI_STATUS Status;
DEBUG ((DEBUG_INFO, "SetDmaProtectedRange(0x%lx) - [0x%x, 0x%x] [0x%lx, 0x%lx]\n", EngineMask, LowMemoryBase, LowMemoryLength, HighMemoryBase, HighMemoryLength));
for (Index = 0; Index < VTdInfo->VTdEngineCount; Index++) {
if ((EngineMask & LShiftU64(1, Index)) == 0) {
continue;
}
DisablePmr ((UINTN)VTdInfo->VTdEngineAddress[Index]);
Status = SetPmrRegion (
VTdInfo->HostAddressWidth,
(UINTN)VTdInfo->VTdEngineAddress[Index],
LowMemoryBase,
LowMemoryLength,
HighMemoryBase,
HighMemoryLength
);
if (EFI_ERROR(Status)) {
return Status;
}
Status = EnablePmr ((UINTN)VTdInfo->VTdEngineAddress[Index]);
if (EFI_ERROR(Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
/**
Diable DMA protection.
@param VTdInfo The VTd engine context information.
@param EngineMask The mask of the VTd engine to be accessed.
@retval EFI_SUCCESS DMA protection is disabled.
**/
EFI_STATUS
DisableDmaProtection (
IN VTD_INFO *VTdInfo,
IN UINT64 EngineMask
)
{
UINTN Index;
EFI_STATUS Status;
DEBUG ((DEBUG_INFO, "DisableDmaProtection - 0x%lx\n", EngineMask));
for (Index = 0; Index < VTdInfo->VTdEngineCount; Index++) {
DEBUG ((DEBUG_INFO, "Disabling...%d\n", Index));
if ((EngineMask & LShiftU64(1, Index)) == 0) {
continue;
}
Status = DisablePmr ((UINTN)VTdInfo->VTdEngineAddress[Index]);
if (EFI_ERROR(Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
/**
Return if the PMR is enabled.
@param VtdUnitBaseAddress The base address of the VTd engine.
@retval TRUE PMR is enabled.
@retval FALSE PMR is disabled or unsupported.
**/
BOOLEAN
IsPmrEnabled (
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 FALSE;
}
Reg32 = MmioRead32 (VtdUnitBaseAddress + R_PMEN_ENABLE_REG);
if ((Reg32 & BIT0) == 0) {
return FALSE;
}
return TRUE;
}
/**
Return the mask of the VTd engine which is enabled.
@param VTdInfo The VTd engine context information.
@param EngineMask The mask of the VTd engine to be accessed.
@return the mask of the VTd engine which is enabled.
**/
UINT64
GetDmaProtectionEnabledEngineMask (
IN VTD_INFO *VTdInfo,
IN UINT64 EngineMask
)
{
UINTN Index;
BOOLEAN Result;
UINT64 EnabledEngineMask;
DEBUG ((DEBUG_INFO, "GetDmaProtectionEnabledEngineMask - 0x%lx\n", EngineMask));
EnabledEngineMask = 0;
for (Index = 0; Index < VTdInfo->VTdEngineCount; Index++) {
if ((EngineMask & LShiftU64(1, Index)) == 0) {
continue;
}
Result = IsPmrEnabled ((UINTN)VTdInfo->VTdEngineAddress[Index]);
if (Result) {
EnabledEngineMask |= LShiftU64(1, Index);
}
}
DEBUG ((DEBUG_INFO, "EnabledEngineMask - 0x%lx\n", EnabledEngineMask));
return EnabledEngineMask;
}
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