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- /** @file
- SMM MP service implementation
- Copyright (c) 2009 - 2022, Intel Corporation. All rights reserved.<BR>
- Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "PiSmmCpuDxeSmm.h"
- //
- // Slots for all MTRR( FIXED MTRR + VARIABLE MTRR + MTRR_LIB_IA32_MTRR_DEF_TYPE)
- //
- MTRR_SETTINGS gSmiMtrrs;
- UINT64 gPhyMask;
- SMM_DISPATCHER_MP_SYNC_DATA *mSmmMpSyncData = NULL;
- UINTN mSmmMpSyncDataSize;
- SMM_CPU_SEMAPHORES mSmmCpuSemaphores;
- UINTN mSemaphoreSize;
- SPIN_LOCK *mPFLock = NULL;
- SMM_CPU_SYNC_MODE mCpuSmmSyncMode;
- BOOLEAN mMachineCheckSupported = FALSE;
- MM_COMPLETION mSmmStartupThisApToken;
- extern UINTN mSmmShadowStackSize;
- /**
- Performs an atomic compare exchange operation to get semaphore.
- The compare exchange operation must be performed using
- MP safe mechanisms.
- @param Sem IN: 32-bit unsigned integer
- OUT: original integer - 1
- @return Original integer - 1
- **/
- UINT32
- WaitForSemaphore (
- IN OUT volatile UINT32 *Sem
- )
- {
- UINT32 Value;
- for ( ; ;) {
- Value = *Sem;
- if ((Value != 0) &&
- (InterlockedCompareExchange32 (
- (UINT32 *)Sem,
- Value,
- Value - 1
- ) == Value))
- {
- break;
- }
- CpuPause ();
- }
- return Value - 1;
- }
- /**
- Performs an atomic compare exchange operation to release semaphore.
- The compare exchange operation must be performed using
- MP safe mechanisms.
- @param Sem IN: 32-bit unsigned integer
- OUT: original integer + 1
- @return Original integer + 1
- **/
- UINT32
- ReleaseSemaphore (
- IN OUT volatile UINT32 *Sem
- )
- {
- UINT32 Value;
- do {
- Value = *Sem;
- } while (Value + 1 != 0 &&
- InterlockedCompareExchange32 (
- (UINT32 *)Sem,
- Value,
- Value + 1
- ) != Value);
- return Value + 1;
- }
- /**
- Performs an atomic compare exchange operation to lock semaphore.
- The compare exchange operation must be performed using
- MP safe mechanisms.
- @param Sem IN: 32-bit unsigned integer
- OUT: -1
- @return Original integer
- **/
- UINT32
- LockdownSemaphore (
- IN OUT volatile UINT32 *Sem
- )
- {
- UINT32 Value;
- do {
- Value = *Sem;
- } while (InterlockedCompareExchange32 (
- (UINT32 *)Sem,
- Value,
- (UINT32)-1
- ) != Value);
- return Value;
- }
- /**
- Wait all APs to performs an atomic compare exchange operation to release semaphore.
- @param NumberOfAPs AP number
- **/
- VOID
- WaitForAllAPs (
- IN UINTN NumberOfAPs
- )
- {
- UINTN BspIndex;
- BspIndex = mSmmMpSyncData->BspIndex;
- while (NumberOfAPs-- > 0) {
- WaitForSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- }
- }
- /**
- Performs an atomic compare exchange operation to release semaphore
- for each AP.
- **/
- VOID
- ReleaseAllAPs (
- VOID
- )
- {
- UINTN Index;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (IsPresentAp (Index)) {
- ReleaseSemaphore (mSmmMpSyncData->CpuData[Index].Run);
- }
- }
- }
- /**
- Checks if all CPUs (with certain exceptions) have checked in for this SMI run
- @param Exceptions CPU Arrival exception flags.
- @retval TRUE if all CPUs the have checked in.
- @retval FALSE if at least one Normal AP hasn't checked in.
- **/
- BOOLEAN
- AllCpusInSmmWithExceptions (
- SMM_CPU_ARRIVAL_EXCEPTIONS Exceptions
- )
- {
- UINTN Index;
- SMM_CPU_DATA_BLOCK *CpuData;
- EFI_PROCESSOR_INFORMATION *ProcessorInfo;
- ASSERT (*mSmmMpSyncData->Counter <= mNumberOfCpus);
- if (*mSmmMpSyncData->Counter == mNumberOfCpus) {
- return TRUE;
- }
- CpuData = mSmmMpSyncData->CpuData;
- ProcessorInfo = gSmmCpuPrivate->ProcessorInfo;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (!(*(CpuData[Index].Present)) && (ProcessorInfo[Index].ProcessorId != INVALID_APIC_ID)) {
- if (((Exceptions & ARRIVAL_EXCEPTION_DELAYED) != 0) && (SmmCpuFeaturesGetSmmRegister (Index, SmmRegSmmDelayed) != 0)) {
- continue;
- }
- if (((Exceptions & ARRIVAL_EXCEPTION_BLOCKED) != 0) && (SmmCpuFeaturesGetSmmRegister (Index, SmmRegSmmBlocked) != 0)) {
- continue;
- }
- if (((Exceptions & ARRIVAL_EXCEPTION_SMI_DISABLED) != 0) && (SmmCpuFeaturesGetSmmRegister (Index, SmmRegSmmEnable) != 0)) {
- continue;
- }
- return FALSE;
- }
- }
- return TRUE;
- }
- /**
- Has OS enabled Lmce in the MSR_IA32_MCG_EXT_CTL
- @retval TRUE Os enable lmce.
- @retval FALSE Os not enable lmce.
- **/
- BOOLEAN
- IsLmceOsEnabled (
- VOID
- )
- {
- MSR_IA32_MCG_CAP_REGISTER McgCap;
- MSR_IA32_FEATURE_CONTROL_REGISTER FeatureCtrl;
- MSR_IA32_MCG_EXT_CTL_REGISTER McgExtCtrl;
- McgCap.Uint64 = AsmReadMsr64 (MSR_IA32_MCG_CAP);
- if (McgCap.Bits.MCG_LMCE_P == 0) {
- return FALSE;
- }
- FeatureCtrl.Uint64 = AsmReadMsr64 (MSR_IA32_FEATURE_CONTROL);
- if (FeatureCtrl.Bits.LmceOn == 0) {
- return FALSE;
- }
- McgExtCtrl.Uint64 = AsmReadMsr64 (MSR_IA32_MCG_EXT_CTL);
- return (BOOLEAN)(McgExtCtrl.Bits.LMCE_EN == 1);
- }
- /**
- Return if Local machine check exception signaled.
- Indicates (when set) that a local machine check exception was generated. This indicates that the current machine-check event was
- delivered to only the logical processor.
- @retval TRUE LMCE was signaled.
- @retval FALSE LMCE was not signaled.
- **/
- BOOLEAN
- IsLmceSignaled (
- VOID
- )
- {
- MSR_IA32_MCG_STATUS_REGISTER McgStatus;
- McgStatus.Uint64 = AsmReadMsr64 (MSR_IA32_MCG_STATUS);
- return (BOOLEAN)(McgStatus.Bits.LMCE_S == 1);
- }
- /**
- Given timeout constraint, wait for all APs to arrive, and insure when this function returns, no AP will execute normal mode code before
- entering SMM, except SMI disabled APs.
- **/
- VOID
- SmmWaitForApArrival (
- VOID
- )
- {
- UINT64 Timer;
- UINTN Index;
- BOOLEAN LmceEn;
- BOOLEAN LmceSignal;
- ASSERT (*mSmmMpSyncData->Counter <= mNumberOfCpus);
- LmceEn = FALSE;
- LmceSignal = FALSE;
- if (mMachineCheckSupported) {
- LmceEn = IsLmceOsEnabled ();
- LmceSignal = IsLmceSignaled ();
- }
- //
- // Platform implementor should choose a timeout value appropriately:
- // - The timeout value should balance the SMM time constrains and the likelihood that delayed CPUs are excluded in the SMM run. Note
- // the SMI Handlers must ALWAYS take into account the cases that not all APs are available in an SMI run.
- // - The timeout value must, in the case of 2nd timeout, be at least long enough to give time for all APs to receive the SMI IPI
- // and either enter SMM or buffer the SMI, to insure there is no CPU running normal mode code when SMI handling starts. This will
- // be TRUE even if a blocked CPU is brought out of the blocked state by a normal mode CPU (before the normal mode CPU received the
- // SMI IPI), because with a buffered SMI, and CPU will enter SMM immediately after it is brought out of the blocked state.
- // - The timeout value must be longer than longest possible IO operation in the system
- //
- //
- // Sync with APs 1st timeout
- //
- for (Timer = StartSyncTimer ();
- !IsSyncTimerTimeout (Timer) && !(LmceEn && LmceSignal);
- )
- {
- mSmmMpSyncData->AllApArrivedWithException = AllCpusInSmmWithExceptions (ARRIVAL_EXCEPTION_BLOCKED | ARRIVAL_EXCEPTION_SMI_DISABLED);
- if (mSmmMpSyncData->AllApArrivedWithException) {
- break;
- }
- CpuPause ();
- }
- //
- // Not all APs have arrived, so we need 2nd round of timeout. IPIs should be sent to ALL none present APs,
- // because:
- // a) Delayed AP may have just come out of the delayed state. Blocked AP may have just been brought out of blocked state by some AP running
- // normal mode code. These APs need to be guaranteed to have an SMI pending to insure that once they are out of delayed / blocked state, they
- // enter SMI immediately without executing instructions in normal mode. Note traditional flow requires there are no APs doing normal mode
- // work while SMI handling is on-going.
- // b) As a consequence of SMI IPI sending, (spurious) SMI may occur after this SMM run.
- // c) ** NOTE **: Use SMI disabling feature VERY CAREFULLY (if at all) for traditional flow, because a processor in SMI-disabled state
- // will execute normal mode code, which breaks the traditional SMI handlers' assumption that no APs are doing normal
- // mode work while SMI handling is on-going.
- // d) We don't add code to check SMI disabling status to skip sending IPI to SMI disabled APs, because:
- // - In traditional flow, SMI disabling is discouraged.
- // - In relaxed flow, CheckApArrival() will check SMI disabling status before calling this function.
- // In both cases, adding SMI-disabling checking code increases overhead.
- //
- if (*mSmmMpSyncData->Counter < mNumberOfCpus) {
- //
- // Send SMI IPIs to bring outside processors in
- //
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (!(*(mSmmMpSyncData->CpuData[Index].Present)) && (gSmmCpuPrivate->ProcessorInfo[Index].ProcessorId != INVALID_APIC_ID)) {
- SendSmiIpi ((UINT32)gSmmCpuPrivate->ProcessorInfo[Index].ProcessorId);
- }
- }
- //
- // Sync with APs 2nd timeout.
- //
- for (Timer = StartSyncTimer ();
- !IsSyncTimerTimeout (Timer);
- )
- {
- mSmmMpSyncData->AllApArrivedWithException = AllCpusInSmmWithExceptions (ARRIVAL_EXCEPTION_BLOCKED | ARRIVAL_EXCEPTION_SMI_DISABLED);
- if (mSmmMpSyncData->AllApArrivedWithException) {
- break;
- }
- CpuPause ();
- }
- }
- return;
- }
- /**
- Replace OS MTRR's with SMI MTRR's.
- @param CpuIndex Processor Index
- **/
- VOID
- ReplaceOSMtrrs (
- IN UINTN CpuIndex
- )
- {
- SmmCpuFeaturesDisableSmrr ();
- //
- // Replace all MTRRs registers
- //
- MtrrSetAllMtrrs (&gSmiMtrrs);
- }
- /**
- Wheck whether task has been finished by all APs.
- @param BlockMode Whether did it in block mode or non-block mode.
- @retval TRUE Task has been finished by all APs.
- @retval FALSE Task not has been finished by all APs.
- **/
- BOOLEAN
- WaitForAllAPsNotBusy (
- IN BOOLEAN BlockMode
- )
- {
- UINTN Index;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- //
- // Ignore BSP and APs which not call in SMM.
- //
- if (!IsPresentAp (Index)) {
- continue;
- }
- if (BlockMode) {
- AcquireSpinLock (mSmmMpSyncData->CpuData[Index].Busy);
- ReleaseSpinLock (mSmmMpSyncData->CpuData[Index].Busy);
- } else {
- if (AcquireSpinLockOrFail (mSmmMpSyncData->CpuData[Index].Busy)) {
- ReleaseSpinLock (mSmmMpSyncData->CpuData[Index].Busy);
- } else {
- return FALSE;
- }
- }
- }
- return TRUE;
- }
- /**
- Check whether it is an present AP.
- @param CpuIndex The AP index which calls this function.
- @retval TRUE It's a present AP.
- @retval TRUE This is not an AP or it is not present.
- **/
- BOOLEAN
- IsPresentAp (
- IN UINTN CpuIndex
- )
- {
- return ((CpuIndex != gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu) &&
- *(mSmmMpSyncData->CpuData[CpuIndex].Present));
- }
- /**
- Clean up the status flags used during executing the procedure.
- @param CpuIndex The AP index which calls this function.
- **/
- VOID
- ReleaseToken (
- IN UINTN CpuIndex
- )
- {
- PROCEDURE_TOKEN *Token;
- Token = mSmmMpSyncData->CpuData[CpuIndex].Token;
- if (InterlockedDecrement (&Token->RunningApCount) == 0) {
- ReleaseSpinLock (Token->SpinLock);
- }
- mSmmMpSyncData->CpuData[CpuIndex].Token = NULL;
- }
- /**
- Free the tokens in the maintained list.
- **/
- VOID
- ResetTokens (
- VOID
- )
- {
- //
- // Reset the FirstFreeToken to the beginning of token list upon exiting SMI.
- //
- gSmmCpuPrivate->FirstFreeToken = GetFirstNode (&gSmmCpuPrivate->TokenList);
- }
- /**
- SMI handler for BSP.
- @param CpuIndex BSP processor Index
- @param SyncMode SMM MP sync mode
- **/
- VOID
- BSPHandler (
- IN UINTN CpuIndex,
- IN SMM_CPU_SYNC_MODE SyncMode
- )
- {
- UINTN Index;
- MTRR_SETTINGS Mtrrs;
- UINTN ApCount;
- BOOLEAN ClearTopLevelSmiResult;
- UINTN PresentCount;
- ASSERT (CpuIndex == mSmmMpSyncData->BspIndex);
- ApCount = 0;
- //
- // Flag BSP's presence
- //
- *mSmmMpSyncData->InsideSmm = TRUE;
- //
- // Initialize Debug Agent to start source level debug in BSP handler
- //
- InitializeDebugAgent (DEBUG_AGENT_INIT_ENTER_SMI, NULL, NULL);
- //
- // Mark this processor's presence
- //
- *(mSmmMpSyncData->CpuData[CpuIndex].Present) = TRUE;
- //
- // Clear platform top level SMI status bit before calling SMI handlers. If
- // we cleared it after SMI handlers are run, we would miss the SMI that
- // occurs after SMI handlers are done and before SMI status bit is cleared.
- //
- ClearTopLevelSmiResult = ClearTopLevelSmiStatus ();
- ASSERT (ClearTopLevelSmiResult == TRUE);
- //
- // Set running processor index
- //
- gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu = CpuIndex;
- //
- // If Traditional Sync Mode or need to configure MTRRs: gather all available APs.
- //
- if ((SyncMode == SmmCpuSyncModeTradition) || SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Wait for APs to arrive
- //
- SmmWaitForApArrival ();
- //
- // Lock the counter down and retrieve the number of APs
- //
- *mSmmMpSyncData->AllCpusInSync = TRUE;
- ApCount = LockdownSemaphore (mSmmMpSyncData->Counter) - 1;
- //
- // Wait for all APs to get ready for programming MTRRs
- //
- WaitForAllAPs (ApCount);
- if (SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Signal all APs it's time for backup MTRRs
- //
- ReleaseAllAPs ();
- //
- // WaitForSemaphore() may wait for ever if an AP happens to enter SMM at
- // exactly this point. Please make sure PcdCpuSmmMaxSyncLoops has been set
- // to a large enough value to avoid this situation.
- // Note: For HT capable CPUs, threads within a core share the same set of MTRRs.
- // We do the backup first and then set MTRR to avoid race condition for threads
- // in the same core.
- //
- MtrrGetAllMtrrs (&Mtrrs);
- //
- // Wait for all APs to complete their MTRR saving
- //
- WaitForAllAPs (ApCount);
- //
- // Let all processors program SMM MTRRs together
- //
- ReleaseAllAPs ();
- //
- // WaitForSemaphore() may wait for ever if an AP happens to enter SMM at
- // exactly this point. Please make sure PcdCpuSmmMaxSyncLoops has been set
- // to a large enough value to avoid this situation.
- //
- ReplaceOSMtrrs (CpuIndex);
- //
- // Wait for all APs to complete their MTRR programming
- //
- WaitForAllAPs (ApCount);
- }
- }
- //
- // The BUSY lock is initialized to Acquired state
- //
- AcquireSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- //
- // Perform the pre tasks
- //
- PerformPreTasks ();
- //
- // Invoke SMM Foundation EntryPoint with the processor information context.
- //
- gSmmCpuPrivate->SmmCoreEntry (&gSmmCpuPrivate->SmmCoreEntryContext);
- //
- // Make sure all APs have completed their pending none-block tasks
- //
- WaitForAllAPsNotBusy (TRUE);
- //
- // Perform the remaining tasks
- //
- PerformRemainingTasks ();
- //
- // If Relaxed-AP Sync Mode: gather all available APs after BSP SMM handlers are done, and
- // make those APs to exit SMI synchronously. APs which arrive later will be excluded and
- // will run through freely.
- //
- if ((SyncMode != SmmCpuSyncModeTradition) && !SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Lock the counter down and retrieve the number of APs
- //
- *mSmmMpSyncData->AllCpusInSync = TRUE;
- ApCount = LockdownSemaphore (mSmmMpSyncData->Counter) - 1;
- //
- // Make sure all APs have their Present flag set
- //
- while (TRUE) {
- PresentCount = 0;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (*(mSmmMpSyncData->CpuData[Index].Present)) {
- PresentCount++;
- }
- }
- if (PresentCount > ApCount) {
- break;
- }
- }
- }
- //
- // Notify all APs to exit
- //
- *mSmmMpSyncData->InsideSmm = FALSE;
- ReleaseAllAPs ();
- //
- // Wait for all APs to complete their pending tasks
- //
- WaitForAllAPs (ApCount);
- if (SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Signal APs to restore MTRRs
- //
- ReleaseAllAPs ();
- //
- // Restore OS MTRRs
- //
- SmmCpuFeaturesReenableSmrr ();
- MtrrSetAllMtrrs (&Mtrrs);
- //
- // Wait for all APs to complete MTRR programming
- //
- WaitForAllAPs (ApCount);
- }
- //
- // Stop source level debug in BSP handler, the code below will not be
- // debugged.
- //
- InitializeDebugAgent (DEBUG_AGENT_INIT_EXIT_SMI, NULL, NULL);
- //
- // Signal APs to Reset states/semaphore for this processor
- //
- ReleaseAllAPs ();
- //
- // Perform pending operations for hot-plug
- //
- SmmCpuUpdate ();
- //
- // Clear the Present flag of BSP
- //
- *(mSmmMpSyncData->CpuData[CpuIndex].Present) = FALSE;
- //
- // Gather APs to exit SMM synchronously. Note the Present flag is cleared by now but
- // WaitForAllAps does not depend on the Present flag.
- //
- WaitForAllAPs (ApCount);
- //
- // Reset the tokens buffer.
- //
- ResetTokens ();
- //
- // Reset BspIndex to -1, meaning BSP has not been elected.
- //
- if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
- mSmmMpSyncData->BspIndex = (UINT32)-1;
- }
- //
- // Allow APs to check in from this point on
- //
- *mSmmMpSyncData->Counter = 0;
- *mSmmMpSyncData->AllCpusInSync = FALSE;
- mSmmMpSyncData->AllApArrivedWithException = FALSE;
- }
- /**
- SMI handler for AP.
- @param CpuIndex AP processor Index.
- @param ValidSmi Indicates that current SMI is a valid SMI or not.
- @param SyncMode SMM MP sync mode.
- **/
- VOID
- APHandler (
- IN UINTN CpuIndex,
- IN BOOLEAN ValidSmi,
- IN SMM_CPU_SYNC_MODE SyncMode
- )
- {
- UINT64 Timer;
- UINTN BspIndex;
- MTRR_SETTINGS Mtrrs;
- EFI_STATUS ProcedureStatus;
- //
- // Timeout BSP
- //
- for (Timer = StartSyncTimer ();
- !IsSyncTimerTimeout (Timer) &&
- !(*mSmmMpSyncData->InsideSmm);
- )
- {
- CpuPause ();
- }
- if (!(*mSmmMpSyncData->InsideSmm)) {
- //
- // BSP timeout in the first round
- //
- if (mSmmMpSyncData->BspIndex != -1) {
- //
- // BSP Index is known
- //
- BspIndex = mSmmMpSyncData->BspIndex;
- ASSERT (CpuIndex != BspIndex);
- //
- // Send SMI IPI to bring BSP in
- //
- SendSmiIpi ((UINT32)gSmmCpuPrivate->ProcessorInfo[BspIndex].ProcessorId);
- //
- // Now clock BSP for the 2nd time
- //
- for (Timer = StartSyncTimer ();
- !IsSyncTimerTimeout (Timer) &&
- !(*mSmmMpSyncData->InsideSmm);
- )
- {
- CpuPause ();
- }
- if (!(*mSmmMpSyncData->InsideSmm)) {
- //
- // Give up since BSP is unable to enter SMM
- // and signal the completion of this AP
- WaitForSemaphore (mSmmMpSyncData->Counter);
- return;
- }
- } else {
- //
- // Don't know BSP index. Give up without sending IPI to BSP.
- //
- WaitForSemaphore (mSmmMpSyncData->Counter);
- return;
- }
- }
- //
- // BSP is available
- //
- BspIndex = mSmmMpSyncData->BspIndex;
- ASSERT (CpuIndex != BspIndex);
- //
- // Mark this processor's presence
- //
- *(mSmmMpSyncData->CpuData[CpuIndex].Present) = TRUE;
- if ((SyncMode == SmmCpuSyncModeTradition) || SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Notify BSP of arrival at this point
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- }
- if (SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Wait for the signal from BSP to backup MTRRs
- //
- WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- //
- // Backup OS MTRRs
- //
- MtrrGetAllMtrrs (&Mtrrs);
- //
- // Signal BSP the completion of this AP
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- //
- // Wait for BSP's signal to program MTRRs
- //
- WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- //
- // Replace OS MTRRs with SMI MTRRs
- //
- ReplaceOSMtrrs (CpuIndex);
- //
- // Signal BSP the completion of this AP
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- }
- while (TRUE) {
- //
- // Wait for something to happen
- //
- WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- //
- // Check if BSP wants to exit SMM
- //
- if (!(*mSmmMpSyncData->InsideSmm)) {
- break;
- }
- //
- // BUSY should be acquired by SmmStartupThisAp()
- //
- ASSERT (
- !AcquireSpinLockOrFail (mSmmMpSyncData->CpuData[CpuIndex].Busy)
- );
- //
- // Invoke the scheduled procedure
- //
- ProcedureStatus = (*mSmmMpSyncData->CpuData[CpuIndex].Procedure)(
- (VOID *)mSmmMpSyncData->CpuData[CpuIndex].Parameter
- );
- if (mSmmMpSyncData->CpuData[CpuIndex].Status != NULL) {
- *mSmmMpSyncData->CpuData[CpuIndex].Status = ProcedureStatus;
- }
- if (mSmmMpSyncData->CpuData[CpuIndex].Token != NULL) {
- ReleaseToken (CpuIndex);
- }
- //
- // Release BUSY
- //
- ReleaseSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- }
- if (SmmCpuFeaturesNeedConfigureMtrrs ()) {
- //
- // Notify BSP the readiness of this AP to program MTRRs
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- //
- // Wait for the signal from BSP to program MTRRs
- //
- WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- //
- // Restore OS MTRRs
- //
- SmmCpuFeaturesReenableSmrr ();
- MtrrSetAllMtrrs (&Mtrrs);
- }
- //
- // Notify BSP the readiness of this AP to Reset states/semaphore for this processor
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- //
- // Wait for the signal from BSP to Reset states/semaphore for this processor
- //
- WaitForSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- //
- // Reset states/semaphore for this processor
- //
- *(mSmmMpSyncData->CpuData[CpuIndex].Present) = FALSE;
- //
- // Notify BSP the readiness of this AP to exit SMM
- //
- ReleaseSemaphore (mSmmMpSyncData->CpuData[BspIndex].Run);
- }
- /**
- Create 4G PageTable in SMRAM.
- @param[in] Is32BitPageTable Whether the page table is 32-bit PAE
- @return PageTable Address
- **/
- UINT32
- Gen4GPageTable (
- IN BOOLEAN Is32BitPageTable
- )
- {
- VOID *PageTable;
- UINTN Index;
- UINT64 *Pte;
- UINTN PagesNeeded;
- UINTN Low2MBoundary;
- UINTN High2MBoundary;
- UINTN Pages;
- UINTN GuardPage;
- UINT64 *Pdpte;
- UINTN PageIndex;
- UINTN PageAddress;
- Low2MBoundary = 0;
- High2MBoundary = 0;
- PagesNeeded = 0;
- if (FeaturePcdGet (PcdCpuSmmStackGuard)) {
- //
- // Add one more page for known good stack, then find the lower 2MB aligned address.
- //
- Low2MBoundary = (mSmmStackArrayBase + EFI_PAGE_SIZE) & ~(SIZE_2MB-1);
- //
- // Add two more pages for known good stack and stack guard page,
- // then find the lower 2MB aligned address.
- //
- High2MBoundary = (mSmmStackArrayEnd - mSmmStackSize - mSmmShadowStackSize + EFI_PAGE_SIZE * 2) & ~(SIZE_2MB-1);
- PagesNeeded = ((High2MBoundary - Low2MBoundary) / SIZE_2MB) + 1;
- }
- //
- // Allocate the page table
- //
- PageTable = AllocatePageTableMemory (5 + PagesNeeded);
- ASSERT (PageTable != NULL);
- PageTable = (VOID *)((UINTN)PageTable);
- Pte = (UINT64 *)PageTable;
- //
- // Zero out all page table entries first
- //
- ZeroMem (Pte, EFI_PAGES_TO_SIZE (1));
- //
- // Set Page Directory Pointers
- //
- for (Index = 0; Index < 4; Index++) {
- Pte[Index] = ((UINTN)PageTable + EFI_PAGE_SIZE * (Index + 1)) | mAddressEncMask |
- (Is32BitPageTable ? IA32_PAE_PDPTE_ATTRIBUTE_BITS : PAGE_ATTRIBUTE_BITS);
- }
- Pte += EFI_PAGE_SIZE / sizeof (*Pte);
- //
- // Fill in Page Directory Entries
- //
- for (Index = 0; Index < EFI_PAGE_SIZE * 4 / sizeof (*Pte); Index++) {
- Pte[Index] = (Index << 21) | mAddressEncMask | IA32_PG_PS | PAGE_ATTRIBUTE_BITS;
- }
- Pdpte = (UINT64 *)PageTable;
- if (FeaturePcdGet (PcdCpuSmmStackGuard)) {
- Pages = (UINTN)PageTable + EFI_PAGES_TO_SIZE (5);
- GuardPage = mSmmStackArrayBase + EFI_PAGE_SIZE;
- for (PageIndex = Low2MBoundary; PageIndex <= High2MBoundary; PageIndex += SIZE_2MB) {
- Pte = (UINT64 *)(UINTN)(Pdpte[BitFieldRead32 ((UINT32)PageIndex, 30, 31)] & ~mAddressEncMask & ~(EFI_PAGE_SIZE - 1));
- Pte[BitFieldRead32 ((UINT32)PageIndex, 21, 29)] = (UINT64)Pages | mAddressEncMask | PAGE_ATTRIBUTE_BITS;
- //
- // Fill in Page Table Entries
- //
- Pte = (UINT64 *)Pages;
- PageAddress = PageIndex;
- for (Index = 0; Index < EFI_PAGE_SIZE / sizeof (*Pte); Index++) {
- if (PageAddress == GuardPage) {
- //
- // Mark the guard page as non-present
- //
- Pte[Index] = PageAddress | mAddressEncMask;
- GuardPage += (mSmmStackSize + mSmmShadowStackSize);
- if (GuardPage > mSmmStackArrayEnd) {
- GuardPage = 0;
- }
- } else {
- Pte[Index] = PageAddress | mAddressEncMask | PAGE_ATTRIBUTE_BITS;
- }
- PageAddress += EFI_PAGE_SIZE;
- }
- Pages += EFI_PAGE_SIZE;
- }
- }
- if ((PcdGet8 (PcdNullPointerDetectionPropertyMask) & BIT1) != 0) {
- Pte = (UINT64 *)(UINTN)(Pdpte[0] & ~mAddressEncMask & ~(EFI_PAGE_SIZE - 1));
- if ((Pte[0] & IA32_PG_PS) == 0) {
- // 4K-page entries are already mapped. Just hide the first one anyway.
- Pte = (UINT64 *)(UINTN)(Pte[0] & ~mAddressEncMask & ~(EFI_PAGE_SIZE - 1));
- Pte[0] &= ~(UINT64)IA32_PG_P; // Hide page 0
- } else {
- // Create 4K-page entries
- Pages = (UINTN)AllocatePageTableMemory (1);
- ASSERT (Pages != 0);
- Pte[0] = (UINT64)(Pages | mAddressEncMask | PAGE_ATTRIBUTE_BITS);
- Pte = (UINT64 *)Pages;
- PageAddress = 0;
- Pte[0] = PageAddress | mAddressEncMask; // Hide page 0 but present left
- for (Index = 1; Index < EFI_PAGE_SIZE / sizeof (*Pte); Index++) {
- PageAddress += EFI_PAGE_SIZE;
- Pte[Index] = PageAddress | mAddressEncMask | PAGE_ATTRIBUTE_BITS;
- }
- }
- }
- return (UINT32)(UINTN)PageTable;
- }
- /**
- Checks whether the input token is the current used token.
- @param[in] Token This parameter describes the token that was passed into DispatchProcedure or
- BroadcastProcedure.
- @retval TRUE The input token is the current used token.
- @retval FALSE The input token is not the current used token.
- **/
- BOOLEAN
- IsTokenInUse (
- IN SPIN_LOCK *Token
- )
- {
- LIST_ENTRY *Link;
- PROCEDURE_TOKEN *ProcToken;
- if (Token == NULL) {
- return FALSE;
- }
- Link = GetFirstNode (&gSmmCpuPrivate->TokenList);
- //
- // Only search used tokens.
- //
- while (Link != gSmmCpuPrivate->FirstFreeToken) {
- ProcToken = PROCEDURE_TOKEN_FROM_LINK (Link);
- if (ProcToken->SpinLock == Token) {
- return TRUE;
- }
- Link = GetNextNode (&gSmmCpuPrivate->TokenList, Link);
- }
- return FALSE;
- }
- /**
- Allocate buffer for the SPIN_LOCK and PROCEDURE_TOKEN.
- @return First token of the token buffer.
- **/
- LIST_ENTRY *
- AllocateTokenBuffer (
- VOID
- )
- {
- UINTN SpinLockSize;
- UINT32 TokenCountPerChunk;
- UINTN Index;
- SPIN_LOCK *SpinLock;
- UINT8 *SpinLockBuffer;
- PROCEDURE_TOKEN *ProcTokens;
- SpinLockSize = GetSpinLockProperties ();
- TokenCountPerChunk = FixedPcdGet32 (PcdCpuSmmMpTokenCountPerChunk);
- ASSERT (TokenCountPerChunk != 0);
- if (TokenCountPerChunk == 0) {
- DEBUG ((DEBUG_ERROR, "PcdCpuSmmMpTokenCountPerChunk should not be Zero!\n"));
- CpuDeadLoop ();
- }
- DEBUG ((DEBUG_INFO, "CpuSmm: SpinLock Size = 0x%x, PcdCpuSmmMpTokenCountPerChunk = 0x%x\n", SpinLockSize, TokenCountPerChunk));
- //
- // Separate the Spin_lock and Proc_token because the alignment requires by Spin_Lock.
- //
- SpinLockBuffer = AllocatePool (SpinLockSize * TokenCountPerChunk);
- ASSERT (SpinLockBuffer != NULL);
- ProcTokens = AllocatePool (sizeof (PROCEDURE_TOKEN) * TokenCountPerChunk);
- ASSERT (ProcTokens != NULL);
- for (Index = 0; Index < TokenCountPerChunk; Index++) {
- SpinLock = (SPIN_LOCK *)(SpinLockBuffer + SpinLockSize * Index);
- InitializeSpinLock (SpinLock);
- ProcTokens[Index].Signature = PROCEDURE_TOKEN_SIGNATURE;
- ProcTokens[Index].SpinLock = SpinLock;
- ProcTokens[Index].RunningApCount = 0;
- InsertTailList (&gSmmCpuPrivate->TokenList, &ProcTokens[Index].Link);
- }
- return &ProcTokens[0].Link;
- }
- /**
- Get the free token.
- If no free token, allocate new tokens then return the free one.
- @param RunningApsCount The Running Aps count for this token.
- @retval return the first free PROCEDURE_TOKEN.
- **/
- PROCEDURE_TOKEN *
- GetFreeToken (
- IN UINT32 RunningApsCount
- )
- {
- PROCEDURE_TOKEN *NewToken;
- //
- // If FirstFreeToken meets the end of token list, enlarge the token list.
- // Set FirstFreeToken to the first free token.
- //
- if (gSmmCpuPrivate->FirstFreeToken == &gSmmCpuPrivate->TokenList) {
- gSmmCpuPrivate->FirstFreeToken = AllocateTokenBuffer ();
- }
- NewToken = PROCEDURE_TOKEN_FROM_LINK (gSmmCpuPrivate->FirstFreeToken);
- gSmmCpuPrivate->FirstFreeToken = GetNextNode (&gSmmCpuPrivate->TokenList, gSmmCpuPrivate->FirstFreeToken);
- NewToken->RunningApCount = RunningApsCount;
- AcquireSpinLock (NewToken->SpinLock);
- return NewToken;
- }
- /**
- Checks status of specified AP.
- This function checks whether the specified AP has finished the task assigned
- by StartupThisAP(), and whether timeout expires.
- @param[in] Token This parameter describes the token that was passed into DispatchProcedure or
- BroadcastProcedure.
- @retval EFI_SUCCESS Specified AP has finished task assigned by StartupThisAPs().
- @retval EFI_NOT_READY Specified AP has not finished task and timeout has not expired.
- **/
- EFI_STATUS
- IsApReady (
- IN SPIN_LOCK *Token
- )
- {
- if (AcquireSpinLockOrFail (Token)) {
- ReleaseSpinLock (Token);
- return EFI_SUCCESS;
- }
- return EFI_NOT_READY;
- }
- /**
- Schedule a procedure to run on the specified CPU.
- @param[in] Procedure The address of the procedure to run
- @param[in] CpuIndex Target CPU Index
- @param[in,out] ProcArguments The parameter to pass to the procedure
- @param[in] Token This is an optional parameter that allows the caller to execute the
- procedure in a blocking or non-blocking fashion. If it is NULL the
- call is blocking, and the call will not return until the AP has
- completed the procedure. If the token is not NULL, the call will
- return immediately. The caller can check whether the procedure has
- completed with CheckOnProcedure or WaitForProcedure.
- @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for the APs to finish
- execution of Procedure, either for blocking or non-blocking mode.
- Zero means infinity. If the timeout expires before all APs return
- from Procedure, then Procedure on the failed APs is terminated. If
- the timeout expires in blocking mode, the call returns EFI_TIMEOUT.
- If the timeout expires in non-blocking mode, the timeout determined
- can be through CheckOnProcedure or WaitForProcedure.
- Note that timeout support is optional. Whether an implementation
- supports this feature can be determined via the Attributes data
- member.
- @param[in,out] CpuStatus This optional pointer may be used to get the status code returned
- by Procedure when it completes execution on the target AP, or with
- EFI_TIMEOUT if the Procedure fails to complete within the optional
- timeout. The implementation will update this variable with
- EFI_NOT_READY prior to starting Procedure on the target AP.
- @retval EFI_INVALID_PARAMETER CpuNumber not valid
- @retval EFI_INVALID_PARAMETER CpuNumber specifying BSP
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber did not enter SMM
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber is busy
- @retval EFI_SUCCESS The procedure has been successfully scheduled
- **/
- EFI_STATUS
- InternalSmmStartupThisAp (
- IN EFI_AP_PROCEDURE2 Procedure,
- IN UINTN CpuIndex,
- IN OUT VOID *ProcArguments OPTIONAL,
- IN MM_COMPLETION *Token,
- IN UINTN TimeoutInMicroseconds,
- IN OUT EFI_STATUS *CpuStatus
- )
- {
- PROCEDURE_TOKEN *ProcToken;
- if (CpuIndex >= gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus) {
- DEBUG ((DEBUG_ERROR, "CpuIndex(%d) >= gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus(%d)\n", CpuIndex, gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus));
- return EFI_INVALID_PARAMETER;
- }
- if (CpuIndex == gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu) {
- DEBUG ((DEBUG_ERROR, "CpuIndex(%d) == gSmmCpuPrivate->SmmCoreEntryContext.CurrentlyExecutingCpu\n", CpuIndex));
- return EFI_INVALID_PARAMETER;
- }
- if (gSmmCpuPrivate->ProcessorInfo[CpuIndex].ProcessorId == INVALID_APIC_ID) {
- return EFI_INVALID_PARAMETER;
- }
- if (!(*(mSmmMpSyncData->CpuData[CpuIndex].Present))) {
- if (mSmmMpSyncData->EffectiveSyncMode == SmmCpuSyncModeTradition) {
- DEBUG ((DEBUG_ERROR, "!mSmmMpSyncData->CpuData[%d].Present\n", CpuIndex));
- }
- return EFI_INVALID_PARAMETER;
- }
- if (gSmmCpuPrivate->Operation[CpuIndex] == SmmCpuRemove) {
- if (!FeaturePcdGet (PcdCpuHotPlugSupport)) {
- DEBUG ((DEBUG_ERROR, "gSmmCpuPrivate->Operation[%d] == SmmCpuRemove\n", CpuIndex));
- }
- return EFI_INVALID_PARAMETER;
- }
- if ((TimeoutInMicroseconds != 0) && ((mSmmMp.Attributes & EFI_MM_MP_TIMEOUT_SUPPORTED) == 0)) {
- return EFI_INVALID_PARAMETER;
- }
- if (Procedure == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- AcquireSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- mSmmMpSyncData->CpuData[CpuIndex].Procedure = Procedure;
- mSmmMpSyncData->CpuData[CpuIndex].Parameter = ProcArguments;
- if (Token != NULL) {
- if (Token != &mSmmStartupThisApToken) {
- //
- // When Token points to mSmmStartupThisApToken, this routine is called
- // from SmmStartupThisAp() in non-blocking mode (PcdCpuSmmBlockStartupThisAp == FALSE).
- //
- // In this case, caller wants to startup AP procedure in non-blocking
- // mode and cannot get the completion status from the Token because there
- // is no way to return the Token to caller from SmmStartupThisAp().
- // Caller needs to use its implementation specific way to query the completion status.
- //
- // There is no need to allocate a token for such case so the 3 overheads
- // can be avoided:
- // 1. Call AllocateTokenBuffer() when there is no free token.
- // 2. Get a free token from the token buffer.
- // 3. Call ReleaseToken() in APHandler().
- //
- ProcToken = GetFreeToken (1);
- mSmmMpSyncData->CpuData[CpuIndex].Token = ProcToken;
- *Token = (MM_COMPLETION)ProcToken->SpinLock;
- }
- }
- mSmmMpSyncData->CpuData[CpuIndex].Status = CpuStatus;
- if (mSmmMpSyncData->CpuData[CpuIndex].Status != NULL) {
- *mSmmMpSyncData->CpuData[CpuIndex].Status = EFI_NOT_READY;
- }
- ReleaseSemaphore (mSmmMpSyncData->CpuData[CpuIndex].Run);
- if (Token == NULL) {
- AcquireSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- ReleaseSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- }
- return EFI_SUCCESS;
- }
- /**
- 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] TimeoutInMicroseconds Indicates the time limit in microseconds for
- APs to return from Procedure, either for
- blocking or non-blocking mode.
- @param[in,out] ProcedureArguments The parameter passed into Procedure for
- all APs.
- @param[in,out] Token This is an optional parameter that allows the caller to execute the
- procedure in a blocking or non-blocking fashion. If it is NULL the
- call is blocking, and the call will not return until the AP has
- completed the procedure. If the token is not NULL, the call will
- return immediately. The caller can check whether the procedure has
- completed with CheckOnProcedure or WaitForProcedure.
- @param[in,out] CPUStatus This optional pointer may be used to get the status code returned
- by Procedure when it completes execution on the target AP, or with
- EFI_TIMEOUT if the Procedure fails to complete within the optional
- timeout. The implementation will update this variable with
- EFI_NOT_READY prior to starting Procedure on the target AP.
- @retval EFI_SUCCESS In blocking mode, all APs have finished before
- the timeout expired.
- @retval EFI_SUCCESS In non-blocking mode, function has been dispatched
- to all enabled APs.
- @retval others Failed to Startup all APs.
- **/
- EFI_STATUS
- InternalSmmStartupAllAPs (
- IN EFI_AP_PROCEDURE2 Procedure,
- IN UINTN TimeoutInMicroseconds,
- IN OUT VOID *ProcedureArguments OPTIONAL,
- IN OUT MM_COMPLETION *Token,
- IN OUT EFI_STATUS *CPUStatus
- )
- {
- UINTN Index;
- UINTN CpuCount;
- PROCEDURE_TOKEN *ProcToken;
- if ((TimeoutInMicroseconds != 0) && ((mSmmMp.Attributes & EFI_MM_MP_TIMEOUT_SUPPORTED) == 0)) {
- return EFI_INVALID_PARAMETER;
- }
- if (Procedure == NULL) {
- return EFI_INVALID_PARAMETER;
- }
- CpuCount = 0;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (IsPresentAp (Index)) {
- CpuCount++;
- if (gSmmCpuPrivate->Operation[Index] == SmmCpuRemove) {
- return EFI_INVALID_PARAMETER;
- }
- if (!AcquireSpinLockOrFail (mSmmMpSyncData->CpuData[Index].Busy)) {
- return EFI_NOT_READY;
- }
- ReleaseSpinLock (mSmmMpSyncData->CpuData[Index].Busy);
- }
- }
- if (CpuCount == 0) {
- return EFI_NOT_STARTED;
- }
- if (Token != NULL) {
- ProcToken = GetFreeToken ((UINT32)mMaxNumberOfCpus);
- *Token = (MM_COMPLETION)ProcToken->SpinLock;
- } else {
- ProcToken = NULL;
- }
- //
- // Make sure all BUSY should be acquired.
- //
- // Because former code already check mSmmMpSyncData->CpuData[***].Busy for each AP.
- // Here code always use AcquireSpinLock instead of AcquireSpinLockOrFail for not
- // block mode.
- //
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (IsPresentAp (Index)) {
- AcquireSpinLock (mSmmMpSyncData->CpuData[Index].Busy);
- }
- }
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- if (IsPresentAp (Index)) {
- mSmmMpSyncData->CpuData[Index].Procedure = (EFI_AP_PROCEDURE2)Procedure;
- mSmmMpSyncData->CpuData[Index].Parameter = ProcedureArguments;
- if (ProcToken != NULL) {
- mSmmMpSyncData->CpuData[Index].Token = ProcToken;
- }
- if (CPUStatus != NULL) {
- mSmmMpSyncData->CpuData[Index].Status = &CPUStatus[Index];
- if (mSmmMpSyncData->CpuData[Index].Status != NULL) {
- *mSmmMpSyncData->CpuData[Index].Status = EFI_NOT_READY;
- }
- }
- } else {
- //
- // PI spec requirement:
- // For every excluded processor, the array entry must contain a value of EFI_NOT_STARTED.
- //
- if (CPUStatus != NULL) {
- CPUStatus[Index] = EFI_NOT_STARTED;
- }
- //
- // Decrease the count to mark this processor(AP or BSP) as finished.
- //
- if (ProcToken != NULL) {
- WaitForSemaphore (&ProcToken->RunningApCount);
- }
- }
- }
- ReleaseAllAPs ();
- if (Token == NULL) {
- //
- // Make sure all APs have completed their tasks.
- //
- WaitForAllAPsNotBusy (TRUE);
- }
- return EFI_SUCCESS;
- }
- /**
- ISO C99 6.5.2.2 "Function calls", paragraph 9:
- If the function is defined with a type that is not compatible with
- the type (of the expression) pointed to by the expression that
- denotes the called function, the behavior is undefined.
- So add below wrapper function to convert between EFI_AP_PROCEDURE
- and EFI_AP_PROCEDURE2.
- Wrapper for Procedures.
- @param[in] Buffer Pointer to PROCEDURE_WRAPPER buffer.
- **/
- EFI_STATUS
- EFIAPI
- ProcedureWrapper (
- IN VOID *Buffer
- )
- {
- PROCEDURE_WRAPPER *Wrapper;
- Wrapper = Buffer;
- Wrapper->Procedure (Wrapper->ProcedureArgument);
- return EFI_SUCCESS;
- }
- /**
- Schedule a procedure to run on the specified CPU in blocking mode.
- @param[in] Procedure The address of the procedure to run
- @param[in] CpuIndex Target CPU Index
- @param[in, out] ProcArguments The parameter to pass to the procedure
- @retval EFI_INVALID_PARAMETER CpuNumber not valid
- @retval EFI_INVALID_PARAMETER CpuNumber specifying BSP
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber did not enter SMM
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber is busy
- @retval EFI_SUCCESS The procedure has been successfully scheduled
- **/
- EFI_STATUS
- EFIAPI
- SmmBlockingStartupThisAp (
- IN EFI_AP_PROCEDURE Procedure,
- IN UINTN CpuIndex,
- IN OUT VOID *ProcArguments OPTIONAL
- )
- {
- PROCEDURE_WRAPPER Wrapper;
- Wrapper.Procedure = Procedure;
- Wrapper.ProcedureArgument = ProcArguments;
- //
- // Use wrapper function to convert EFI_AP_PROCEDURE to EFI_AP_PROCEDURE2.
- //
- return InternalSmmStartupThisAp (ProcedureWrapper, CpuIndex, &Wrapper, NULL, 0, NULL);
- }
- /**
- Schedule a procedure to run on the specified CPU.
- @param Procedure The address of the procedure to run
- @param CpuIndex Target CPU Index
- @param ProcArguments The parameter to pass to the procedure
- @retval EFI_INVALID_PARAMETER CpuNumber not valid
- @retval EFI_INVALID_PARAMETER CpuNumber specifying BSP
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber did not enter SMM
- @retval EFI_INVALID_PARAMETER The AP specified by CpuNumber is busy
- @retval EFI_SUCCESS The procedure has been successfully scheduled
- **/
- EFI_STATUS
- EFIAPI
- SmmStartupThisAp (
- IN EFI_AP_PROCEDURE Procedure,
- IN UINTN CpuIndex,
- IN OUT VOID *ProcArguments OPTIONAL
- )
- {
- gSmmCpuPrivate->ApWrapperFunc[CpuIndex].Procedure = Procedure;
- gSmmCpuPrivate->ApWrapperFunc[CpuIndex].ProcedureArgument = ProcArguments;
- //
- // Use wrapper function to convert EFI_AP_PROCEDURE to EFI_AP_PROCEDURE2.
- //
- return InternalSmmStartupThisAp (
- ProcedureWrapper,
- CpuIndex,
- &gSmmCpuPrivate->ApWrapperFunc[CpuIndex],
- FeaturePcdGet (PcdCpuSmmBlockStartupThisAp) ? NULL : &mSmmStartupThisApToken,
- 0,
- NULL
- );
- }
- /**
- This function sets DR6 & DR7 according to SMM save state, before running SMM C code.
- They are useful when you want to enable hardware breakpoints in SMM without entry SMM mode.
- NOTE: It might not be appreciated in runtime since it might
- conflict with OS debugging facilities. Turn them off in RELEASE.
- @param CpuIndex CPU Index
- **/
- VOID
- EFIAPI
- CpuSmmDebugEntry (
- IN UINTN CpuIndex
- )
- {
- SMRAM_SAVE_STATE_MAP *CpuSaveState;
- if (FeaturePcdGet (PcdCpuSmmDebug)) {
- ASSERT (CpuIndex < mMaxNumberOfCpus);
- CpuSaveState = (SMRAM_SAVE_STATE_MAP *)gSmmCpuPrivate->CpuSaveState[CpuIndex];
- if (mSmmSaveStateRegisterLma == EFI_SMM_SAVE_STATE_REGISTER_LMA_32BIT) {
- AsmWriteDr6 (CpuSaveState->x86._DR6);
- AsmWriteDr7 (CpuSaveState->x86._DR7);
- } else {
- AsmWriteDr6 ((UINTN)CpuSaveState->x64._DR6);
- AsmWriteDr7 ((UINTN)CpuSaveState->x64._DR7);
- }
- }
- }
- /**
- This function restores DR6 & DR7 to SMM save state.
- NOTE: It might not be appreciated in runtime since it might
- conflict with OS debugging facilities. Turn them off in RELEASE.
- @param CpuIndex CPU Index
- **/
- VOID
- EFIAPI
- CpuSmmDebugExit (
- IN UINTN CpuIndex
- )
- {
- SMRAM_SAVE_STATE_MAP *CpuSaveState;
- if (FeaturePcdGet (PcdCpuSmmDebug)) {
- ASSERT (CpuIndex < mMaxNumberOfCpus);
- CpuSaveState = (SMRAM_SAVE_STATE_MAP *)gSmmCpuPrivate->CpuSaveState[CpuIndex];
- if (mSmmSaveStateRegisterLma == EFI_SMM_SAVE_STATE_REGISTER_LMA_32BIT) {
- CpuSaveState->x86._DR7 = (UINT32)AsmReadDr7 ();
- CpuSaveState->x86._DR6 = (UINT32)AsmReadDr6 ();
- } else {
- CpuSaveState->x64._DR7 = AsmReadDr7 ();
- CpuSaveState->x64._DR6 = AsmReadDr6 ();
- }
- }
- }
- /**
- C function for SMI entry, each processor comes here upon SMI trigger.
- @param CpuIndex CPU Index
- **/
- VOID
- EFIAPI
- SmiRendezvous (
- IN UINTN CpuIndex
- )
- {
- EFI_STATUS Status;
- BOOLEAN ValidSmi;
- BOOLEAN IsBsp;
- BOOLEAN BspInProgress;
- UINTN Index;
- UINTN Cr2;
- ASSERT (CpuIndex < mMaxNumberOfCpus);
- //
- // Save Cr2 because Page Fault exception in SMM may override its value,
- // when using on-demand paging for above 4G memory.
- //
- Cr2 = 0;
- SaveCr2 (&Cr2);
- //
- // Call the user register Startup function first.
- //
- if (mSmmMpSyncData->StartupProcedure != NULL) {
- mSmmMpSyncData->StartupProcedure (mSmmMpSyncData->StartupProcArgs);
- }
- //
- // Perform CPU specific entry hooks
- //
- SmmCpuFeaturesRendezvousEntry (CpuIndex);
- //
- // Determine if this is a valid SMI
- //
- ValidSmi = PlatformValidSmi ();
- //
- // Determine if BSP has been already in progress. Note this must be checked after
- // ValidSmi because BSP may clear a valid SMI source after checking in.
- //
- BspInProgress = *mSmmMpSyncData->InsideSmm;
- if (!BspInProgress && !ValidSmi) {
- //
- // If we reach here, it means when we sampled the ValidSmi flag, SMI status had not
- // been cleared by BSP in a new SMI run (so we have a truly invalid SMI), or SMI
- // status had been cleared by BSP and an existing SMI run has almost ended. (Note
- // we sampled ValidSmi flag BEFORE judging BSP-in-progress status.) In both cases, there
- // is nothing we need to do.
- //
- goto Exit;
- } else {
- //
- // Signal presence of this processor
- //
- if (ReleaseSemaphore (mSmmMpSyncData->Counter) == 0) {
- //
- // BSP has already ended the synchronization, so QUIT!!!
- //
- //
- // Wait for BSP's signal to finish SMI
- //
- while (*mSmmMpSyncData->AllCpusInSync) {
- CpuPause ();
- }
- goto Exit;
- } else {
- //
- // The BUSY lock is initialized to Released state.
- // This needs to be done early enough to be ready for BSP's SmmStartupThisAp() call.
- // E.g., with Relaxed AP flow, SmmStartupThisAp() may be called immediately
- // after AP's present flag is detected.
- //
- InitializeSpinLock (mSmmMpSyncData->CpuData[CpuIndex].Busy);
- }
- if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
- ActivateSmmProfile (CpuIndex);
- }
- if (BspInProgress) {
- //
- // BSP has been elected. Follow AP path, regardless of ValidSmi flag
- // as BSP may have cleared the SMI status
- //
- APHandler (CpuIndex, ValidSmi, mSmmMpSyncData->EffectiveSyncMode);
- } else {
- //
- // We have a valid SMI
- //
- //
- // Elect BSP
- //
- IsBsp = FALSE;
- if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
- if (!mSmmMpSyncData->SwitchBsp || mSmmMpSyncData->CandidateBsp[CpuIndex]) {
- //
- // Call platform hook to do BSP election
- //
- Status = PlatformSmmBspElection (&IsBsp);
- if (EFI_SUCCESS == Status) {
- //
- // Platform hook determines successfully
- //
- if (IsBsp) {
- mSmmMpSyncData->BspIndex = (UINT32)CpuIndex;
- }
- } else {
- //
- // Platform hook fails to determine, use default BSP election method
- //
- InterlockedCompareExchange32 (
- (UINT32 *)&mSmmMpSyncData->BspIndex,
- (UINT32)-1,
- (UINT32)CpuIndex
- );
- }
- }
- }
- //
- // "mSmmMpSyncData->BspIndex == CpuIndex" means this is the BSP
- //
- if (mSmmMpSyncData->BspIndex == CpuIndex) {
- //
- // Clear last request for SwitchBsp.
- //
- if (mSmmMpSyncData->SwitchBsp) {
- mSmmMpSyncData->SwitchBsp = FALSE;
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- mSmmMpSyncData->CandidateBsp[Index] = FALSE;
- }
- }
- if (FeaturePcdGet (PcdCpuSmmProfileEnable)) {
- SmmProfileRecordSmiNum ();
- }
- //
- // BSP Handler is always called with a ValidSmi == TRUE
- //
- BSPHandler (CpuIndex, mSmmMpSyncData->EffectiveSyncMode);
- } else {
- APHandler (CpuIndex, ValidSmi, mSmmMpSyncData->EffectiveSyncMode);
- }
- }
- ASSERT (*mSmmMpSyncData->CpuData[CpuIndex].Run == 0);
- //
- // Wait for BSP's signal to exit SMI
- //
- while (*mSmmMpSyncData->AllCpusInSync) {
- CpuPause ();
- }
- }
- Exit:
- SmmCpuFeaturesRendezvousExit (CpuIndex);
- //
- // Restore Cr2
- //
- RestoreCr2 (Cr2);
- }
- /**
- Allocate buffer for SpinLock and Wrapper function buffer.
- **/
- VOID
- InitializeDataForMmMp (
- VOID
- )
- {
- gSmmCpuPrivate->ApWrapperFunc = AllocatePool (sizeof (PROCEDURE_WRAPPER) * gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus);
- ASSERT (gSmmCpuPrivate->ApWrapperFunc != NULL);
- InitializeListHead (&gSmmCpuPrivate->TokenList);
- gSmmCpuPrivate->FirstFreeToken = AllocateTokenBuffer ();
- }
- /**
- Allocate buffer for all semaphores and spin locks.
- **/
- VOID
- InitializeSmmCpuSemaphores (
- VOID
- )
- {
- UINTN ProcessorCount;
- UINTN TotalSize;
- UINTN GlobalSemaphoresSize;
- UINTN CpuSemaphoresSize;
- UINTN SemaphoreSize;
- UINTN Pages;
- UINTN *SemaphoreBlock;
- UINTN SemaphoreAddr;
- SemaphoreSize = GetSpinLockProperties ();
- ProcessorCount = gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus;
- GlobalSemaphoresSize = (sizeof (SMM_CPU_SEMAPHORE_GLOBAL) / sizeof (VOID *)) * SemaphoreSize;
- CpuSemaphoresSize = (sizeof (SMM_CPU_SEMAPHORE_CPU) / sizeof (VOID *)) * ProcessorCount * SemaphoreSize;
- TotalSize = GlobalSemaphoresSize + CpuSemaphoresSize;
- DEBUG ((DEBUG_INFO, "One Semaphore Size = 0x%x\n", SemaphoreSize));
- DEBUG ((DEBUG_INFO, "Total Semaphores Size = 0x%x\n", TotalSize));
- Pages = EFI_SIZE_TO_PAGES (TotalSize);
- SemaphoreBlock = AllocatePages (Pages);
- ASSERT (SemaphoreBlock != NULL);
- ZeroMem (SemaphoreBlock, TotalSize);
- SemaphoreAddr = (UINTN)SemaphoreBlock;
- mSmmCpuSemaphores.SemaphoreGlobal.Counter = (UINT32 *)SemaphoreAddr;
- SemaphoreAddr += SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreGlobal.InsideSmm = (BOOLEAN *)SemaphoreAddr;
- SemaphoreAddr += SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreGlobal.AllCpusInSync = (BOOLEAN *)SemaphoreAddr;
- SemaphoreAddr += SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreGlobal.PFLock = (SPIN_LOCK *)SemaphoreAddr;
- SemaphoreAddr += SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreGlobal.CodeAccessCheckLock
- = (SPIN_LOCK *)SemaphoreAddr;
- SemaphoreAddr += SemaphoreSize;
- SemaphoreAddr = (UINTN)SemaphoreBlock + GlobalSemaphoresSize;
- mSmmCpuSemaphores.SemaphoreCpu.Busy = (SPIN_LOCK *)SemaphoreAddr;
- SemaphoreAddr += ProcessorCount * SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreCpu.Run = (UINT32 *)SemaphoreAddr;
- SemaphoreAddr += ProcessorCount * SemaphoreSize;
- mSmmCpuSemaphores.SemaphoreCpu.Present = (BOOLEAN *)SemaphoreAddr;
- mPFLock = mSmmCpuSemaphores.SemaphoreGlobal.PFLock;
- mConfigSmmCodeAccessCheckLock = mSmmCpuSemaphores.SemaphoreGlobal.CodeAccessCheckLock;
- mSemaphoreSize = SemaphoreSize;
- }
- /**
- Initialize un-cacheable data.
- **/
- VOID
- EFIAPI
- InitializeMpSyncData (
- VOID
- )
- {
- UINTN CpuIndex;
- if (mSmmMpSyncData != NULL) {
- //
- // mSmmMpSyncDataSize includes one structure of SMM_DISPATCHER_MP_SYNC_DATA, one
- // CpuData array of SMM_CPU_DATA_BLOCK and one CandidateBsp array of BOOLEAN.
- //
- ZeroMem (mSmmMpSyncData, mSmmMpSyncDataSize);
- mSmmMpSyncData->CpuData = (SMM_CPU_DATA_BLOCK *)((UINT8 *)mSmmMpSyncData + sizeof (SMM_DISPATCHER_MP_SYNC_DATA));
- mSmmMpSyncData->CandidateBsp = (BOOLEAN *)(mSmmMpSyncData->CpuData + gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus);
- if (FeaturePcdGet (PcdCpuSmmEnableBspElection)) {
- //
- // Enable BSP election by setting BspIndex to -1
- //
- mSmmMpSyncData->BspIndex = (UINT32)-1;
- }
- mSmmMpSyncData->EffectiveSyncMode = mCpuSmmSyncMode;
- mSmmMpSyncData->Counter = mSmmCpuSemaphores.SemaphoreGlobal.Counter;
- mSmmMpSyncData->InsideSmm = mSmmCpuSemaphores.SemaphoreGlobal.InsideSmm;
- mSmmMpSyncData->AllCpusInSync = mSmmCpuSemaphores.SemaphoreGlobal.AllCpusInSync;
- ASSERT (
- mSmmMpSyncData->Counter != NULL && mSmmMpSyncData->InsideSmm != NULL &&
- mSmmMpSyncData->AllCpusInSync != NULL
- );
- *mSmmMpSyncData->Counter = 0;
- *mSmmMpSyncData->InsideSmm = FALSE;
- *mSmmMpSyncData->AllCpusInSync = FALSE;
- mSmmMpSyncData->AllApArrivedWithException = FALSE;
- for (CpuIndex = 0; CpuIndex < gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus; CpuIndex++) {
- mSmmMpSyncData->CpuData[CpuIndex].Busy =
- (SPIN_LOCK *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Busy + mSemaphoreSize * CpuIndex);
- mSmmMpSyncData->CpuData[CpuIndex].Run =
- (UINT32 *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Run + mSemaphoreSize * CpuIndex);
- mSmmMpSyncData->CpuData[CpuIndex].Present =
- (BOOLEAN *)((UINTN)mSmmCpuSemaphores.SemaphoreCpu.Present + mSemaphoreSize * CpuIndex);
- *(mSmmMpSyncData->CpuData[CpuIndex].Busy) = 0;
- *(mSmmMpSyncData->CpuData[CpuIndex].Run) = 0;
- *(mSmmMpSyncData->CpuData[CpuIndex].Present) = FALSE;
- }
- }
- }
- /**
- Initialize global data for MP synchronization.
- @param Stacks Base address of SMI stack buffer for all processors.
- @param StackSize Stack size for each processor in SMM.
- @param ShadowStackSize Shadow Stack size for each processor in SMM.
- **/
- UINT32
- InitializeMpServiceData (
- IN VOID *Stacks,
- IN UINTN StackSize,
- IN UINTN ShadowStackSize
- )
- {
- UINT32 Cr3;
- UINTN Index;
- UINT8 *GdtTssTables;
- UINTN GdtTableStepSize;
- CPUID_VERSION_INFO_EDX RegEdx;
- UINT32 MaxExtendedFunction;
- CPUID_VIR_PHY_ADDRESS_SIZE_EAX VirPhyAddressSize;
- //
- // Determine if this CPU supports machine check
- //
- AsmCpuid (CPUID_VERSION_INFO, NULL, NULL, NULL, &RegEdx.Uint32);
- mMachineCheckSupported = (BOOLEAN)(RegEdx.Bits.MCA == 1);
- //
- // Allocate memory for all locks and semaphores
- //
- InitializeSmmCpuSemaphores ();
- //
- // Initialize mSmmMpSyncData
- //
- mSmmMpSyncDataSize = sizeof (SMM_DISPATCHER_MP_SYNC_DATA) +
- (sizeof (SMM_CPU_DATA_BLOCK) + sizeof (BOOLEAN)) * gSmmCpuPrivate->SmmCoreEntryContext.NumberOfCpus;
- mSmmMpSyncData = (SMM_DISPATCHER_MP_SYNC_DATA *)AllocatePages (EFI_SIZE_TO_PAGES (mSmmMpSyncDataSize));
- ASSERT (mSmmMpSyncData != NULL);
- mCpuSmmSyncMode = (SMM_CPU_SYNC_MODE)PcdGet8 (PcdCpuSmmSyncMode);
- InitializeMpSyncData ();
- //
- // Initialize physical address mask
- // NOTE: Physical memory above virtual address limit is not supported !!!
- //
- AsmCpuid (CPUID_EXTENDED_FUNCTION, &MaxExtendedFunction, NULL, NULL, NULL);
- if (MaxExtendedFunction >= CPUID_VIR_PHY_ADDRESS_SIZE) {
- AsmCpuid (CPUID_VIR_PHY_ADDRESS_SIZE, &VirPhyAddressSize.Uint32, NULL, NULL, NULL);
- } else {
- VirPhyAddressSize.Bits.PhysicalAddressBits = 36;
- }
- gPhyMask = LShiftU64 (1, VirPhyAddressSize.Bits.PhysicalAddressBits) - 1;
- //
- // Clear the low 12 bits
- //
- gPhyMask &= 0xfffffffffffff000ULL;
- //
- // Create page tables
- //
- Cr3 = SmmInitPageTable ();
- GdtTssTables = InitGdt (Cr3, &GdtTableStepSize);
- //
- // Install SMI handler for each CPU
- //
- for (Index = 0; Index < mMaxNumberOfCpus; Index++) {
- InstallSmiHandler (
- Index,
- (UINT32)mCpuHotPlugData.SmBase[Index],
- (VOID *)((UINTN)Stacks + (StackSize + ShadowStackSize) * Index),
- StackSize,
- (UINTN)(GdtTssTables + GdtTableStepSize * Index),
- gcSmiGdtr.Limit + 1,
- gcSmiIdtr.Base,
- gcSmiIdtr.Limit + 1,
- Cr3
- );
- }
- //
- // Record current MTRR settings
- //
- ZeroMem (&gSmiMtrrs, sizeof (gSmiMtrrs));
- MtrrGetAllMtrrs (&gSmiMtrrs);
- return Cr3;
- }
- /**
- Register the SMM Foundation entry point.
- @param This Pointer to EFI_SMM_CONFIGURATION_PROTOCOL instance
- @param SmmEntryPoint SMM Foundation EntryPoint
- @retval EFI_SUCCESS Successfully to register SMM foundation entry point
- **/
- EFI_STATUS
- EFIAPI
- RegisterSmmEntry (
- IN CONST EFI_SMM_CONFIGURATION_PROTOCOL *This,
- IN EFI_SMM_ENTRY_POINT SmmEntryPoint
- )
- {
- //
- // Record SMM Foundation EntryPoint, later invoke it on SMI entry vector.
- //
- gSmmCpuPrivate->SmmCoreEntry = SmmEntryPoint;
- return EFI_SUCCESS;
- }
- /**
- Register the SMM Foundation entry point.
- @param[in] Procedure A pointer to the code stream to be run on the designated target AP
- of the system. Type EFI_AP_PROCEDURE is defined below in Volume 2
- with the related definitions of
- EFI_MP_SERVICES_PROTOCOL.StartupAllAPs.
- If caller may pass a value of NULL to deregister any existing
- startup procedure.
- @param[in,out] ProcedureArguments Allows the caller to pass a list of parameters to the code that is
- run by the AP. It is an optional common mailbox between APs and
- the caller to share information
- @retval EFI_SUCCESS The Procedure has been set successfully.
- @retval EFI_INVALID_PARAMETER The Procedure is NULL but ProcedureArguments not NULL.
- **/
- EFI_STATUS
- RegisterStartupProcedure (
- IN EFI_AP_PROCEDURE Procedure,
- IN OUT VOID *ProcedureArguments OPTIONAL
- )
- {
- if ((Procedure == NULL) && (ProcedureArguments != NULL)) {
- return EFI_INVALID_PARAMETER;
- }
- if (mSmmMpSyncData == NULL) {
- return EFI_NOT_READY;
- }
- mSmmMpSyncData->StartupProcedure = Procedure;
- mSmmMpSyncData->StartupProcArgs = ProcedureArguments;
- return EFI_SUCCESS;
- }
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