/**
Worker function setting fixed MTRRs
@param FixedSettings A buffer to hold fixed Mtrrs content.
**/
VOID
MtrrSetFixedMtrrWorker (
IN MTRR_FIXED_SETTINGS *FixedSettings
)
{
UINT32 Index;
for (Index = 0; Index < MTRR_NUMBER_OF_FIXED_MTRR; Index++) {
AsmWriteMsr64 (
mMtrrLibFixedMtrrTable[Index].Msr,
FixedSettings->Mtrr[Index]
);
}
}
/**
Internal worker function that is called to complete CPU initialization at the
end of SmmCpuFeaturesInitializeProcessor().
**/
VOID
FinishSmmCpuFeaturesInitializeProcessor (
VOID
)
{
MSR_IA32_SMM_MONITOR_CTL_REGISTER SmmMonitorCtl;
//
// Set MSEG Base Address in SMM Monitor Control MSR.
//
if (mMsegBase > 0) {
SmmMonitorCtl.Uint64 = 0;
SmmMonitorCtl.Bits.MsegBase = (UINT32)mMsegBase >> 12;
SmmMonitorCtl.Bits.Valid = 1;
AsmWriteMsr64 (MSR_IA32_SMM_MONITOR_CTL, SmmMonitorCtl.Uint64);
}
VOID
CpuSmmSxWorkAround(
)
{
UINT64 MsrValue;
MsrValue = AsmReadMsr64 (0xE2);
if (MsrValue & BIT15) {
return;
}
if (MsrValue & BIT10) {
MsrValue &= ~BIT10;
AsmWriteMsr64 (0xE2, MsrValue);
}
}
EFI_STATUS
AmdSmmOpen (
IN EFI_SMM_ACCESS2_PROTOCOL *This
)
{
UINT64 Value;
if (mSmmAccess2.LockState) {
return EFI_ACCESS_DENIED;
}
Value = AsmReadMsr64 (0xc0010113) & ~2; //TValid
AsmWriteMsr64 (0xc0010113, Value);
mSmramMap.RegionState = EFI_SMRAM_OPEN;
mSmmAccess2.OpenState = TRUE;
return EFI_SUCCESS;
}
EFI_STATUS
AmdSmmClose (
IN EFI_SMM_ACCESS2_PROTOCOL *This
)
{
UINT64 Value;
if (mSmmAccess2.LockState) {
return EFI_ACCESS_DENIED;
}
Value = AsmReadMsr64 (0xc0010113) | 2;
AsmWriteMsr64 (0xc0010113, Value);
mSmramMap.RegionState = EFI_SMRAM_CLOSED;
mSmmAccess2.OpenState = FALSE;
return EFI_SUCCESS;
}
/**
Programs fixed MTRRs registers.
@param MemoryCacheType The memory type to set.
@param Base The base address of memory range.
@param Length The length of memory range.
@retval RETURN_SUCCESS The cache type was updated successfully
@retval RETURN_UNSUPPORTED The requested range or cache type was invalid
for the fixed MTRRs.
**/
RETURN_STATUS
ProgramFixedMtrr (
IN UINT64 MemoryCacheType,
IN OUT UINT64 *Base,
IN OUT UINT64 *Length
)
{
UINT32 MsrNum;
UINT32 ByteShift;
UINT64 TempQword;
UINT64 OrMask;
UINT64 ClearMask;
TempQword = 0;
OrMask = 0;
ClearMask = 0;
for (MsrNum = 0; MsrNum < MTRR_NUMBER_OF_FIXED_MTRR; MsrNum++) {
if ((*Base >= mMtrrLibFixedMtrrTable[MsrNum].BaseAddress) &&
(*Base <
(
mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +
(8 * mMtrrLibFixedMtrrTable[MsrNum].Length)
)
)
) {
break;
}
}
if (MsrNum == MTRR_NUMBER_OF_FIXED_MTRR) {
return RETURN_UNSUPPORTED;
}
//
// We found the fixed MTRR to be programmed
//
for (ByteShift = 0; ByteShift < 8; ByteShift++) {
if (*Base ==
(
mMtrrLibFixedMtrrTable[MsrNum].BaseAddress +
(ByteShift * mMtrrLibFixedMtrrTable[MsrNum].Length)
)
) {
break;
}
}
if (ByteShift == 8) {
return RETURN_UNSUPPORTED;
}
for (
;
((ByteShift < 8) && (*Length >= mMtrrLibFixedMtrrTable[MsrNum].Length));
ByteShift++
) {
OrMask |= LShiftU64 ((UINT64) MemoryCacheType, (UINT32) (ByteShift * 8));
ClearMask |= LShiftU64 ((UINT64) 0xFF, (UINT32) (ByteShift * 8));
*Length -= mMtrrLibFixedMtrrTable[MsrNum].Length;
*Base += mMtrrLibFixedMtrrTable[MsrNum].Length;
}
if (ByteShift < 8 && (*Length != 0)) {
return RETURN_UNSUPPORTED;
}
TempQword =
(AsmReadMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr) & ~ClearMask) | OrMask;
AsmWriteMsr64 (mMtrrLibFixedMtrrTable[MsrNum].Msr, TempQword);
return RETURN_SUCCESS;
}
/**
This function enable TXT environment.
@retval EFI_SUCCESS TXT environment is enabled
@retval EFI_UNSUPPORTED TXT environment is not supported
**/
EFI_STATUS
EnableTxt (
VOID
)
{
TXT_GETSEC_CAPABILITIES TxtCapabilities;
UINT32 Index;
UINT32 RegEax;
UINT32 RegEbx;
UINT32 RegEcx;
BOOLEAN ClearMca;
UINT32 McaCount;
//
// Enable SMX
//
AsmWriteCr4(AsmReadCr4() | CR4_SMXE);
//
// Check TXT Chipset
//
Index = 0;
TxtCapabilities.Uint32 = AsmGetSecCapabilities (Index);
DumpGetSecCapabilities (Index, TxtCapabilities.Uint32);
if (TxtCapabilities.Bits.ChipsetPresent == 0) {
DEBUG ((EFI_D_ERROR, "(TXT) TXT Chipset not present!\n"));
return EFI_UNSUPPORTED;
}
if (TxtCapabilities.Bits.Senter == 0) {
DEBUG ((EFI_D_ERROR, "(TXT) SENTER not supported!\n"));
return EFI_UNSUPPORTED;
}
while (TxtCapabilities.Bits.ExtendedLeafs != 0) {
Index ++;
TxtCapabilities.Uint32 = AsmGetSecCapabilities (Index);
DumpGetSecCapabilities (Index, TxtCapabilities.Uint32);
}
//
// Get parameters
//
ClearMca = TRUE;
Index = 0;
while (TRUE) {
AsmGetSecParameters (Index, &RegEax, &RegEbx, &RegEcx);
if ((RegEax & GETSEC_PARAMETER_TYPE_MASK) == 0) {
break;
}
DumpGetSecParameters (RegEax, RegEbx, RegEcx);
if ((RegEax & GETSEC_PARAMETER_TYPE_MASK) == GETSEC_PARAMETER_TYPE_EXTERNSION) {
if ((RegEax & (1 << 6)) != 0) {
// No need clear MCA
ClearMca = FALSE;
}
}
Index ++;
}
//
// Clear MCA
//
if (ClearMca) {
McaCount = (UINT32)AsmReadMsr64 (IA32_MCG_CAP) & 0xFF;
for (Index = 0; Index < McaCount; Index++) {
AsmWriteMsr64 (IA32_MC0_STATUS + Index * 4, 0);
}
}
return EFI_SUCCESS;
}
/**
Programs registers for the calling processor.
This function programs registers for the calling processor.
@param RegisterTable Pointer to register table of the running processor.
**/
VOID
SetProcessorRegister (
CPU_REGISTER_TABLE *RegisterTable
)
{
CPU_REGISTER_TABLE_ENTRY *RegisterTableEntry;
UINTN Index;
UINTN Value;
//
// Traverse Register Table of this logical processor
//
RegisterTableEntry = (CPU_REGISTER_TABLE_ENTRY *) (UINTN) RegisterTable->RegisterTableEntry;
for (Index = 0; Index < RegisterTable->TableLength; Index++, RegisterTableEntry++) {
//
// Check the type of specified register
//
switch (RegisterTableEntry->RegisterType) {
//
// The specified register is Control Register
//
case ControlRegister:
switch (RegisterTableEntry->Index) {
case 0:
Value = AsmReadCr0 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr0 (Value);
break;
case 2:
Value = AsmReadCr2 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr2 (Value);
break;
case 3:
Value = AsmReadCr3 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr3 (Value);
break;
case 4:
Value = AsmReadCr4 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr4 (Value);
break;
default:
break;
}
break;
//
// The specified register is Model Specific Register
//
case Msr:
//
// If this function is called to restore register setting after INIT signal,
// there is no need to restore MSRs in register table.
//
if (RegisterTableEntry->ValidBitLength >= 64) {
//
// If length is not less than 64 bits, then directly write without reading
//
AsmWriteMsr64 (
RegisterTableEntry->Index,
RegisterTableEntry->Value
);
} else {
//
// Set the bit section according to bit start and length
//
AsmMsrBitFieldWrite64 (
RegisterTableEntry->Index,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
}
break;
//
// Enable or disable cache
//
case CacheControl:
//
// If value of the entry is 0, then disable cache. Otherwise, enable cache.
//
if (RegisterTableEntry->Value == 0) {
AsmDisableCache ();
} else {
AsmEnableCache ();
}
break;
default:
break;
}
}
}
/**
This function is WRMSR handler for SMM.
@param Index CPU index
**/
VOID
SmmWriteMsrHandler (
IN UINT32 Index
)
{
UINT64 Data64;
UINT32 MsrIndex;
VM_ENTRY_CONTROLS VmEntryControls;
X86_REGISTER *Reg;
STM_RSC_MSR_DESC *MsrDesc;
STM_RSC_MSR_DESC LocalMsrDesc;
Reg = &mGuestContextCommonSmm.GuestContextPerCpu[Index].Register;
MsrIndex = ReadUnaligned32 ((UINT32 *)&Reg->Rcx);
MsrDesc = GetStmResourceMsr (mHostContextCommon.MleProtectedResource.Base, MsrIndex);
if ((MsrDesc != NULL) && (MsrDesc->WriteMask != 0)) {
DEBUG ((EFI_D_ERROR, "WRMSR (%x) violation!\n", MsrIndex));
AddEventLogForResource (EvtHandledProtectionException, (STM_RSC *)MsrDesc);
SmmExceptionHandler (Index);
CpuDeadLoop ();
}
MsrDesc = GetStmResourceMsr ((STM_RSC *)(UINTN)mGuestContextCommonSmm.BiosHwResourceRequirementsPtr, MsrIndex);
if ((MsrDesc == NULL) || (MsrDesc->WriteMask == 0) || (MsrDesc->KernelModeProcessing == 0)) {
ZeroMem (&LocalMsrDesc, sizeof(LocalMsrDesc));
LocalMsrDesc.Hdr.RscType = MACHINE_SPECIFIC_REG;
LocalMsrDesc.Hdr.Length = sizeof(LocalMsrDesc);
LocalMsrDesc.MsrIndex = MsrIndex;
LocalMsrDesc.ReadMask = 0;
LocalMsrDesc.WriteMask = (UINT64)-1;
AddEventLogForResource (EvtBiosAccessToUnclaimedResource, (STM_RSC *)&LocalMsrDesc);
}
// DEBUG ((EFI_D_INFO, "!!!WriteMsrHandler!!!\n"));
Data64 = LShiftU64 ((UINT64)ReadUnaligned32 ((UINT32 *)&Reg->Rdx), 32) | (UINT64)ReadUnaligned32 ((UINT32 *)&Reg->Rax);
switch (MsrIndex) {
case IA32_EFER_MSR_INDEX:
#if 0
AcquireSpinLock (&mHostContextCommon.DebugLock);
if ((Data64 & IA32_EFER_MSR_SCE) != 0) {
DEBUG ((EFI_D_INFO, "!!!WriteMsrHandler - SCE!!!\n"));
}
if ((Data64 & IA32_EFER_MSR_XDE) != 0) {
DEBUG ((EFI_D_INFO, "!!!WriteMsrHandler - XDE!!!\n"));
}
ReleaseSpinLock (&mHostContextCommon.DebugLock);
#endif
mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer = Data64;
//
// Check IA32e mode switch
//
VmEntryControls.Uint32 = VmRead32 (VMCS_32_CONTROL_VMENTRY_CONTROLS_INDEX);
if ((Data64 & IA32_EFER_MSR_MLE) != 0) {
mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer |= IA32_EFER_MSR_MLE;
} else {
mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer &= ~IA32_EFER_MSR_MLE;
}
if (((mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer & IA32_EFER_MSR_MLE) != 0) &&
((VmReadN (VMCS_N_GUEST_CR0_INDEX) & CR0_PG) != 0)) {
mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer |= IA32_EFER_MSR_MLA;
VmEntryControls.Bits.Ia32eGuest = 1;
} else {
mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer &= ~IA32_EFER_MSR_MLA;
VmEntryControls.Bits.Ia32eGuest = 0;
}
VmWrite32 (VMCS_32_CONTROL_VMENTRY_CONTROLS_INDEX, VmEntryControls.Uint32);
VmWrite64 (VMCS_64_GUEST_IA32_EFER_INDEX, mGuestContextCommonSmm.GuestContextPerCpu[Index].Efer);
break;
case IA32_SYSENTER_CS_MSR_INDEX:
VmWrite32 (VMCS_32_GUEST_IA32_SYSENTER_CS_INDEX, (UINT32)Data64);
break;
case IA32_SYSENTER_ESP_MSR_INDEX:
VmWriteN (VMCS_N_GUEST_IA32_SYSENTER_ESP_INDEX, (UINTN)Data64);
break;
case IA32_SYSENTER_EIP_MSR_INDEX:
VmWriteN (VMCS_N_GUEST_IA32_SYSENTER_EIP_INDEX, (UINTN)Data64);
break;
case IA32_FS_BASE_MSR_INDEX:
VmWriteN (VMCS_N_GUEST_FS_BASE_INDEX, (UINTN)Data64);
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use FS
break;
case IA32_GS_BASE_MSR_INDEX:
VmWriteN (VMCS_N_GUEST_GS_BASE_INDEX, (UINTN)Data64);
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use GS
break;
#if 0
case IA32_KERNAL_GS_BASE_MSR_INDEX:
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use this
break;
case IA32_STAR_MSR_INDEX:
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use this
break;
case IA32_LSTAR_MSR_INDEX:
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use this
break;
case IA32_FMASK_MSR_INDEX:
AsmWriteMsr64 (MsrIndex, Data64); // VMM does not use this
break;
#endif
case IA32_SMM_MONITOR_CTL_MSR_INDEX:
break;
case EFI_MSR_NEHALEM_SMRR_PHYS_BASE:
case EFI_MSR_NEHALEM_SMRR_PHYS_MASK:
// Ignore the write
break;
case IA32_BIOS_UPDT_TRIG_MSR_INDEX:
// Only write it when BIOS request MicrocodeUpdate
MsrDesc = GetStmResourceMsr ((STM_RSC *)(UINTN)mGuestContextCommonSmm.BiosHwResourceRequirementsPtr, IA32_BIOS_UPDT_TRIG_MSR_INDEX);
if (MsrDesc != NULL) {
AsmWriteMsr64 (MsrIndex, Data64);
}
break;
default:
//
// For rest one, we need pass back to BIOS
//
//
// Need mask write item
//
if (MsrDesc != NULL) {
Data64 |= MsrDesc->WriteMask;
}
AsmWriteMsr64 (MsrIndex, Data64);
break;
}
VmWriteN (VMCS_N_GUEST_RIP_INDEX, VmReadN(VMCS_N_GUEST_RIP_INDEX) + VmRead32(VMCS_32_RO_VMEXIT_INSTRUCTION_LENGTH_INDEX));
return ;
}
/**
Programs registers for the calling processor.
This function programs registers for the calling processor.
@param PreSmmInit Specify the target register table.
If TRUE, the target is the pre-SMM-init register table.
If FALSE, the target is the post-SMM-init register table.
@param ProcessorNumber Handle number of specified logical processor.
**/
VOID
SetProcessorRegisterEx (
IN BOOLEAN PreSmmInit,
IN UINTN ProcessorNumber
)
{
CPU_REGISTER_TABLE *RegisterTable;
CPU_REGISTER_TABLE_ENTRY *RegisterTableEntry;
UINTN Index;
UINTN Value;
UINTN StartIndex;
UINTN EndIndex;
if (PreSmmInit) {
RegisterTable = &mCpuConfigConextBuffer.PreSmmInitRegisterTable[ProcessorNumber];
} else {
RegisterTable = &mCpuConfigConextBuffer.RegisterTable[ProcessorNumber];
}
//
// If microcode patch has been applied, then the first register table entry
// is for microcode upate, so it is skipped.
//
StartIndex = 0;
if (mSetBeforeCpuOnlyReset) {
EndIndex = StartIndex + RegisterTable->NumberBeforeReset;
} else {
StartIndex += RegisterTable->NumberBeforeReset;
EndIndex = RegisterTable->TableLength;
}
//
// Traverse Register Table of this logical processor
//
for (Index = StartIndex; Index < EndIndex; Index++) {
RegisterTableEntry = &RegisterTable->RegisterTableEntry[Index];
//
// Check the type of specified register
//
switch (RegisterTableEntry->RegisterType) {
//
// The specified register is Control Register
//
case ControlRegister:
switch (RegisterTableEntry->Index) {
case 0:
Value = AsmReadCr0 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
AsmWriteCr0 (Value);
break;
case 2:
Value = AsmReadCr2 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
AsmWriteCr2 (Value);
break;
case 3:
Value = AsmReadCr3 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
AsmWriteCr3 (Value);
break;
case 4:
Value = AsmReadCr4 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
AsmWriteCr4 (Value);
break;
case 8:
//
// Do we need to support CR8?
//
break;
default:
break;
}
break;
//
// The specified register is Model Specific Register
//
case Msr:
//
// If this function is called to restore register setting after INIT signal,
// there is no need to restore MSRs in register table.
//
if (!mRestoreSettingAfterInit) {
if (RegisterTableEntry->ValidBitLength >= 64) {
//
// If length is not less than 64 bits, then directly write without reading
//
AsmWriteMsr64 (
RegisterTableEntry->Index,
RegisterTableEntry->Value
);
} else {
//
// Set the bit section according to bit start and length
//
AsmMsrBitFieldWrite64 (
RegisterTableEntry->Index,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
}
}
break;
//
// Enable or disable cache
//
case CacheControl:
//
// If value of the entry is 0, then disable cache. Otherwise, enable cache.
//
if (RegisterTableEntry->Value == 0) {
AsmDisableCache ();
} else {
AsmEnableCache ();
}
break;
default:
break;
}
}
}
/**
Programs registers for the calling processor.
This function programs registers for the calling processor.
@param RegisterTables Pointer to register table of the running processor.
@param RegisterTableCount Register table count.
**/
VOID
SetProcessorRegister (
IN CPU_REGISTER_TABLE *RegisterTables,
IN UINTN RegisterTableCount
)
{
CPU_REGISTER_TABLE_ENTRY *RegisterTableEntry;
UINTN Index;
UINTN Value;
SPIN_LOCK *MsrSpinLock;
UINT32 InitApicId;
CPU_REGISTER_TABLE *RegisterTable;
InitApicId = GetInitialApicId ();
RegisterTable = NULL;
for (Index = 0; Index < RegisterTableCount; Index++) {
if (RegisterTables[Index].InitialApicId == InitApicId) {
RegisterTable = &RegisterTables[Index];
break;
}
}
ASSERT (RegisterTable != NULL);
//
// Traverse Register Table of this logical processor
//
RegisterTableEntry = (CPU_REGISTER_TABLE_ENTRY *) (UINTN) RegisterTable->RegisterTableEntry;
for (Index = 0; Index < RegisterTable->TableLength; Index++, RegisterTableEntry++) {
//
// Check the type of specified register
//
switch (RegisterTableEntry->RegisterType) {
//
// The specified register is Control Register
//
case ControlRegister:
switch (RegisterTableEntry->Index) {
case 0:
Value = AsmReadCr0 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr0 (Value);
break;
case 2:
Value = AsmReadCr2 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr2 (Value);
break;
case 3:
Value = AsmReadCr3 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr3 (Value);
break;
case 4:
Value = AsmReadCr4 ();
Value = (UINTN) BitFieldWrite64 (
Value,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINTN) RegisterTableEntry->Value
);
AsmWriteCr4 (Value);
break;
default:
break;
}
break;
//
// The specified register is Model Specific Register
//
case Msr:
//
// If this function is called to restore register setting after INIT signal,
// there is no need to restore MSRs in register table.
//
if (RegisterTableEntry->ValidBitLength >= 64) {
//
// If length is not less than 64 bits, then directly write without reading
//
AsmWriteMsr64 (
RegisterTableEntry->Index,
RegisterTableEntry->Value
);
} else {
//
// Get lock to avoid Package/Core scope MSRs programming issue in parallel execution mode
// to make sure MSR read/write operation is atomic.
//
MsrSpinLock = GetMsrSpinLockByIndex (RegisterTableEntry->Index);
AcquireSpinLock (MsrSpinLock);
//
// Set the bit section according to bit start and length
//
AsmMsrBitFieldWrite64 (
RegisterTableEntry->Index,
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
RegisterTableEntry->Value
);
ReleaseSpinLock (MsrSpinLock);
}
break;
//
// MemoryMapped operations
//
case MemoryMapped:
AcquireSpinLock (mMemoryMappedLock);
MmioBitFieldWrite32 (
(UINTN)(RegisterTableEntry->Index | LShiftU64 (RegisterTableEntry->HighIndex, 32)),
RegisterTableEntry->ValidBitStart,
RegisterTableEntry->ValidBitStart + RegisterTableEntry->ValidBitLength - 1,
(UINT32)RegisterTableEntry->Value
);
ReleaseSpinLock (mMemoryMappedLock);
break;
//
// Enable or disable cache
//
case CacheControl:
//
// If value of the entry is 0, then disable cache. Otherwise, enable cache.
//
if (RegisterTableEntry->Value == 0) {
AsmDisableCache ();
} else {
AsmEnableCache ();
}
break;
default:
break;
}
}
}
/**
Detect whether specified processor can find matching microcode patch and load it.
**/
VOID
MicrocodeDetect (
VOID
)
{
UINT64 MicrocodePatchAddress;
UINT64 MicrocodePatchRegionSize;
UINT32 ExtendedTableLength;
UINT32 ExtendedTableCount;
EFI_CPU_MICROCODE_EXTENDED_TABLE *ExtendedTable;
EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *ExtendedTableHeader;
EFI_CPU_MICROCODE_HEADER *MicrocodeEntryPoint;
UINTN MicrocodeEnd;
UINTN Index;
UINT8 PlatformId;
UINT32 RegEax;
UINT32 LatestRevision;
UINTN TotalSize;
UINT32 CheckSum32;
BOOLEAN CorrectMicrocode;
INT32 CurrentSignature;
MICROCODE_INFO MicrocodeInfo;
ZeroMem (&MicrocodeInfo, sizeof (MICROCODE_INFO));
MicrocodePatchAddress = PcdGet64 (PcdCpuMicrocodePatchAddress);
MicrocodePatchRegionSize = PcdGet64 (PcdCpuMicrocodePatchRegionSize);
if (MicrocodePatchRegionSize == 0) {
//
// There is no microcode patches
//
return;
}
ExtendedTableLength = 0;
//
// Here data of CPUID leafs have not been collected into context buffer, so
// GetProcessorCpuid() cannot be used here to retrieve CPUID data.
//
AsmCpuid (CPUID_VERSION_INFO, &RegEax, NULL, NULL, NULL);
//
// The index of platform information resides in bits 50:52 of MSR IA32_PLATFORM_ID
//
PlatformId = (UINT8) AsmMsrBitFieldRead64 (EFI_MSR_IA32_PLATFORM_ID, 50, 52);
LatestRevision = 0;
MicrocodeEnd = (UINTN) (MicrocodePatchAddress + MicrocodePatchRegionSize);
MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (UINTN) MicrocodePatchAddress;
do {
//
// Check if the microcode is for the Cpu and the version is newer
// and the update can be processed on the platform
//
CorrectMicrocode = FALSE;
if (MicrocodeEntryPoint->HeaderVersion == 0x1) {
//
// It is the microcode header. It is not the padding data between microcode patches
// becasue the padding data should not include 0x00000001 and it should be the repeated
// byte format (like 0xXYXYXYXY....).
//
if (MicrocodeEntryPoint->ProcessorId == RegEax &&
MicrocodeEntryPoint->UpdateRevision > LatestRevision &&
(MicrocodeEntryPoint->ProcessorFlags & (1 << PlatformId))
) {
if (MicrocodeEntryPoint->DataSize == 0) {
CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, 2048);
} else {
CheckSum32 = CalculateSum32 ((UINT32 *)MicrocodeEntryPoint, MicrocodeEntryPoint->DataSize + sizeof(EFI_CPU_MICROCODE_HEADER));
}
if (CheckSum32 == 0) {
CorrectMicrocode = TRUE;
}
} else if ((MicrocodeEntryPoint->DataSize != 0) &&
(MicrocodeEntryPoint->UpdateRevision > LatestRevision)) {
ExtendedTableLength = MicrocodeEntryPoint->TotalSize - (MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));
if (ExtendedTableLength != 0) {
//
// Extended Table exist, check if the CPU in support list
//
ExtendedTableHeader = (EFI_CPU_MICROCODE_EXTENDED_TABLE_HEADER *)((UINT8 *)(MicrocodeEntryPoint) + MicrocodeEntryPoint->DataSize + sizeof (EFI_CPU_MICROCODE_HEADER));
//
// Calculate Extended Checksum
//
if ((ExtendedTableLength % 4) == 0) {
CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTableHeader, ExtendedTableLength);
if (CheckSum32 == 0) {
//
// Checksum correct
//
ExtendedTableCount = ExtendedTableHeader->ExtendedSignatureCount;
ExtendedTable = (EFI_CPU_MICROCODE_EXTENDED_TABLE *)(ExtendedTableHeader + 1);
for (Index = 0; Index < ExtendedTableCount; Index ++) {
CheckSum32 = CalculateSum32 ((UINT32 *)ExtendedTable, sizeof(EFI_CPU_MICROCODE_EXTENDED_TABLE));
if (CheckSum32 == 0) {
//
// Verify Header
//
if ((ExtendedTable->ProcessorSignature == RegEax) &&
(ExtendedTable->ProcessorFlag & (1 << PlatformId)) ) {
//
// Find one
//
CorrectMicrocode = TRUE;
break;
}
}
ExtendedTable ++;
}
}
}
}
}
} else {
//
// It is the padding data between the microcode patches for microcode patches alignment.
// Because the microcode patch is the multiple of 1-KByte, the padding data should not
// exist if the microcode patch alignment value is not larger than 1-KByte. So, the microcode
// alignment value should be larger than 1-KByte. We could skip SIZE_1KB padding data to
// find the next possible microcode patch header.
//
MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + SIZE_1KB);
continue;
}
//
// Get the next patch.
//
if (MicrocodeEntryPoint->DataSize == 0) {
TotalSize = 2048;
} else {
TotalSize = MicrocodeEntryPoint->TotalSize;
}
if (CorrectMicrocode) {
LatestRevision = MicrocodeEntryPoint->UpdateRevision;
MicrocodeInfo.MicrocodeData = (VOID *)((UINTN)MicrocodeEntryPoint + sizeof (EFI_CPU_MICROCODE_HEADER));
MicrocodeInfo.MicrocodeSize = TotalSize;
MicrocodeInfo.ProcessorId = RegEax;
}
MicrocodeEntryPoint = (EFI_CPU_MICROCODE_HEADER *) (((UINTN) MicrocodeEntryPoint) + TotalSize);
} while (((UINTN) MicrocodeEntryPoint < MicrocodeEnd));
if (LatestRevision > 0) {
//
// Get microcode update signature of currently loaded microcode update
//
CurrentSignature = GetCurrentMicrocodeSignature ();
//
// If no microcode update has been loaded, then trigger microcode load.
//
if (CurrentSignature == 0) {
AsmWriteMsr64 (
EFI_MSR_IA32_BIOS_UPDT_TRIG,
(UINT64) (UINTN) MicrocodeInfo.MicrocodeData
);
MicrocodeInfo.Load = TRUE;
} else {
MicrocodeInfo.Load = FALSE;
}
}
}