/**
Initialize debug agent.
This function is used to set up debug enviroment for DXE phase.
If this function is called by DXE Core, Context must be the pointer
to HOB list which will be used to get GUIDed HOB. It will enable
interrupt to support break-in feature.
If this function is called by DXE module, Context must be NULL. It
will enable interrupt to support break-in feature.
@param[in] InitFlag Init flag is used to decide initialize process.
@param[in] Context Context needed according to InitFlag.
@param[in] Function Continue function called by debug agent library; it was
optional.
**/
VOID
EFIAPI
InitializeDebugAgent (
IN UINT32 InitFlag,
IN VOID *Context, OPTIONAL
IN DEBUG_AGENT_CONTINUE Function OPTIONAL
)
{
UINT64 *MailboxLocation;
DEBUG_AGENT_MAILBOX *Mailbox;
BOOLEAN InterruptStatus;
VOID *HobList;
IA32_DESCRIPTOR IdtDescriptor;
IA32_DESCRIPTOR *Ia32Idtr;
IA32_IDT_ENTRY *Ia32IdtEntry;
if (InitFlag == DEBUG_AGENT_INIT_DXE_AP) {
//
// Invoked by AP, enable interrupt to let AP could receive IPI from other processors
//
EnableInterrupts ();
return ;
}
//
// Disable Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (FALSE);
//
// Save and disable original interrupt status
//
InterruptStatus = SaveAndDisableInterrupts ();
//
// Try to get mailbox firstly
//
HobList = NULL;
Mailbox = NULL;
MailboxLocation = NULL;
switch (InitFlag) {
case DEBUG_AGENT_INIT_DXE_LOAD:
//
// Check if Debug Agent has been initialized before
//
if (IsDebugAgentInitialzed ()) {
DEBUG ((EFI_D_INFO, "Debug Agent: The former agent will be overwritten by the new one!\n"));
}
mMultiProcessorDebugSupport = TRUE;
//
// Save original IDT table
//
AsmReadIdtr (&IdtDescriptor);
mSaveIdtTableSize = IdtDescriptor.Limit + 1;
mSavedIdtTable = AllocateCopyPool (mSaveIdtTableSize, (VOID *) IdtDescriptor.Base);
//
// Initialize Debug Timer hardware and save its initial count
//
mDebugMpContext.DebugTimerInitCount = InitializeDebugTimer ();
//
// Check if Debug Agent initialized in DXE phase
//
Mailbox = GetMailboxFromConfigurationTable ();
if (Mailbox == NULL) {
//
// Try to get mailbox from GUIDed HOB build in PEI
//
HobList = GetHobList ();
Mailbox = GetMailboxFromHob (HobList);
}
//
// Set up IDT table and prepare for IDT entries
//
SetupDebugAgentEnviroment (Mailbox);
//
// For DEBUG_AGENT_INIT_S3, needn't to install configuration table and EFI Serial IO protocol
// For DEBUG_AGENT_INIT_DXE_CORE, InternalConstructorWorker() will invoked in Constructor()
//
InternalConstructorWorker ();
//
// Enable interrupt to receive Debug Timer interrupt
//
EnableInterrupts ();
mDebugAgentInitialized = TRUE;
FindAndReportModuleImageInfo (SIZE_4KB);
*(EFI_STATUS *)Context = EFI_SUCCESS;
if (gST->ConOut != NULL) {
Print (L"Debug Agent: Initialized successfully!\r\n");
Print (L"If the Debug Port is serial port, please make sure this serial port isn't connected by ISA Serial driver\r\n");
Print (L"You could do the following steps to disconnect the serial port:\r\n");
Print (L"1: Shell> drivers\r\n");
Print (L" ...\r\n");
Print (L" V VERSION E G G #D #C DRIVER NAME IMAGE NAME\r\n");
Print (L" == ======== = = = == == =================================== ===================\r\n");
Print (L" 8F 0000000A B - - 1 14 PCI Bus Driver PciBusDxe\r\n");
Print (L" 91 00000010 ? - - - - ATA Bus Driver AtaBusDxe\r\n");
Print (L" ...\r\n");
Print (L" A7 0000000A B - - 1 1 ISA Serial Driver IsaSerialDxe\r\n");
Print (L" ...\r\n");
Print (L"2: Shell> dh -d A7\r\n");
Print (L" A7: Image(IsaSerialDxe) ImageDevPath (..9FB3-11D4-9A3A-0090273FC14D))DriverBinding ComponentName ComponentName2\r\n");
Print (L" Driver Name : ISA Serial Driver\r\n");
Print (L" Image Name : FvFile(93B80003-9FB3-11D4-9A3A-0090273FC14D)\r\n");
Print (L" Driver Version : 0000000A\r\n");
Print (L" Driver Type : BUS\r\n");
Print (L" Configuration : NO\r\n");
Print (L" Diagnostics : NO\r\n");
Print (L" Managing :\r\n");
Print (L" Ctrl[EA] : PciRoot(0x0)/Pci(0x1F,0x0)/Serial(0x0)\r\n");
Print (L" Child[EB] : PciRoot(0x0)/Pci(0x1F,0x0)/Serial(0x0)/Uart(115200,8,N,1)\r\n");
Print (L"3: Shell> disconnect EA\r\n");
Print (L"4: Shell> load -nc DebugAgentDxe.efi\r\n\r\n");
}
break;
case DEBUG_AGENT_INIT_DXE_UNLOAD:
if (mDebugAgentInitialized) {
if (IsHostAttached ()) {
Print (L"Debug Agent: Host is still connected, please de-attach TARGET firstly!\r\n");
*(EFI_STATUS *)Context = EFI_ACCESS_DENIED;
//
// Enable Debug Timer interrupt again
//
SaveAndSetDebugTimerInterrupt (TRUE);
} else {
//
// Restore original IDT table
//
AsmReadIdtr (&IdtDescriptor);
IdtDescriptor.Limit = (UINT16) (mSaveIdtTableSize - 1);
CopyMem ((VOID *) IdtDescriptor.Base, mSavedIdtTable, mSaveIdtTableSize);
AsmWriteIdtr (&IdtDescriptor);
FreePool (mSavedIdtTable);
mDebugAgentInitialized = FALSE;
*(EFI_STATUS *)Context = EFI_SUCCESS;
}
} else {
Print (L"Debug Agent: It hasn't been initialized, cannot unload it!\r\n");
*(EFI_STATUS *)Context = EFI_NOT_STARTED;
}
//
// Restore interrupt state.
//
SetInterruptState (InterruptStatus);
break;
case DEBUG_AGENT_INIT_DXE_CORE:
mDxeCoreFlag = TRUE;
mMultiProcessorDebugSupport = TRUE;
//
// Initialize Debug Timer hardware and its initial count
//
mDebugMpContext.DebugTimerInitCount = InitializeDebugTimer ();
//
// Try to get mailbox from GUIDed HOB build in PEI
//
HobList = Context;
Mailbox = GetMailboxFromHob (HobList);
//
// Set up IDT table and prepare for IDT entries
//
SetupDebugAgentEnviroment (Mailbox);
//
// Enable interrupt to receive Debug Timer interrupt
//
EnableInterrupts ();
break;
case DEBUG_AGENT_INIT_S3:
if (Context != NULL) {
Ia32Idtr = (IA32_DESCRIPTOR *) Context;
Ia32IdtEntry = (IA32_IDT_ENTRY *)(Ia32Idtr->Base);
MailboxLocation = (UINT64 *) (UINTN) (Ia32IdtEntry[DEBUG_MAILBOX_VECTOR].Bits.OffsetLow +
(Ia32IdtEntry[DEBUG_MAILBOX_VECTOR].Bits.OffsetHigh << 16));
Mailbox = (DEBUG_AGENT_MAILBOX *)(UINTN)(*MailboxLocation);
VerifyMailboxChecksum (Mailbox);
}
//
// Save Mailbox pointer in global variable
//
mMailboxPointer = Mailbox;
//
// Set up IDT table and prepare for IDT entries
//
SetupDebugAgentEnviroment (Mailbox);
//
// Disable interrupt
//
DisableInterrupts ();
FindAndReportModuleImageInfo (SIZE_4KB);
if (GetDebugFlag (DEBUG_AGENT_FLAG_BREAK_BOOT_SCRIPT) == 1) {
//
// If Boot Script entry break is set, code will be break at here.
//
CpuBreakpoint ();
}
break;
default:
//
// Only DEBUG_AGENT_INIT_PREMEM_SEC and DEBUG_AGENT_INIT_POSTMEM_SEC are allowed for this
// Debug Agent library instance.
//
DEBUG ((EFI_D_ERROR, "Debug Agent: The InitFlag value is not allowed!\n"));
CpuDeadLoop ();
break;
}
}
/**
Initialize debug agent.
This function is used to set up debug enviroment for source level debug
in SMM code.
If InitFlag is DEBUG_AGENT_INIT_SMM, it will overirde IDT table entries
and initialize debug port. It will get debug agent Mailbox from GUIDed HOB,
it it exists, debug agent wiil copied it into the local Mailbox in SMM space.
it will overirde IDT table entries and initialize debug port. Context will be
NULL.
If InitFlag is DEBUG_AGENT_INIT_ENTER_SMI, debug agent will save Debug
Registers and get local Mailbox in SMM space. Context will be NULL.
If InitFlag is DEBUG_AGENT_INIT_EXIT_SMI, debug agent will restore Debug
Registers. Context will be NULL.
@param[in] InitFlag Init flag is used to decide initialize process.
@param[in] Context Context needed according to InitFlag.
@param[in] Function Continue function called by debug agent library; it was
optional.
**/
VOID
EFIAPI
InitializeDebugAgent (
IN UINT32 InitFlag,
IN VOID *Context, OPTIONAL
IN DEBUG_AGENT_CONTINUE Function OPTIONAL
)
{
EFI_STATUS Status;
UINT64 DebugPortHandle;
IA32_IDT_GATE_DESCRIPTOR IdtEntry[33];
IA32_DESCRIPTOR IdtDescriptor;
IA32_DESCRIPTOR *Ia32Idtr;
IA32_IDT_ENTRY *Ia32IdtEntry;
IA32_DESCRIPTOR Idtr;
UINT16 IdtEntryCount;
DEBUG_AGENT_MAILBOX *Mailbox;
UINT64 *MailboxLocation;
UINT32 DebugTimerFrequency;
BOOLEAN PeriodicMode;
UINTN TimerCycle;
switch (InitFlag) {
case DEBUG_AGENT_INIT_SMM:
//
// Install configuration table for persisted vector handoff info
//
Status = gSmst->SmmInstallConfigurationTable (
gSmst,
&gEfiVectorHandoffTableGuid,
(VOID *) &mVectorHandoffInfoDebugAgent[0],
sizeof (EFI_VECTOR_HANDOFF_INFO) * mVectorHandoffInfoCount
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "DebugAgent: Cannot install configuration table for persisted vector handoff info!\n"));
CpuDeadLoop ();
}
//
// Check if Debug Agent initialized in DXE phase
//
Status = EfiGetSystemConfigurationTable (&gEfiDebugAgentGuid, (VOID **) &Mailbox);
if (Status == EFI_SUCCESS && Mailbox != NULL) {
VerifyMailboxChecksum (Mailbox);
mMailboxPointer = Mailbox;
break;
}
//
// Check if Debug Agent initialized in SEC/PEI phase
//
Mailbox = GetMailboxFromHob ();
if (Mailbox != NULL) {
mMailboxPointer = Mailbox;
break;
}
//
// Debug Agent was not initialized before, use the local mailbox.
//
ZeroMem (&mLocalMailbox, sizeof (DEBUG_AGENT_MAILBOX));
Mailbox = &mLocalMailbox;
//
// Save original IDT entries
//
AsmReadIdtr (&IdtDescriptor);
CopyMem (&IdtEntry, (VOID *)IdtDescriptor.Base, 33 * sizeof(IA32_IDT_GATE_DESCRIPTOR));
//
// Initialized Debug Agent
//
InitializeDebugIdt ();
//
// Initialize Debug Timer hardware and save its frequency
//
InitializeDebugTimer (&DebugTimerFrequency, TRUE);
UpdateMailboxContent (Mailbox, DEBUG_MAILBOX_DEBUG_TIMER_FREQUENCY, DebugTimerFrequency);
DebugPortHandle = (UINT64) (UINTN)DebugPortInitialize ((DEBUG_PORT_HANDLE) (UINTN)Mailbox->DebugPortHandle, NULL);
UpdateMailboxContent (Mailbox, DEBUG_MAILBOX_DEBUG_PORT_HANDLE_INDEX, DebugPortHandle);
mMailboxPointer = Mailbox;
//
// Trigger one software interrupt to inform HOST
//
TriggerSoftInterrupt (SYSTEM_RESET_SIGNATURE);
SetDebugFlag (DEBUG_AGENT_FLAG_MEMORY_READY, 1);
//
// Memory has been ready
//
if (IsHostAttached ()) {
//
// Trigger one software interrupt to inform HOST
//
TriggerSoftInterrupt (MEMORY_READY_SIGNATURE);
}
//
// Find and report PE/COFF image info to HOST
//
FindAndReportModuleImageInfo (SIZE_4KB);
//
// Restore saved IDT entries
//
CopyMem ((VOID *)IdtDescriptor.Base, &IdtEntry, 33 * sizeof(IA32_IDT_GATE_DESCRIPTOR));
break;
case DEBUG_AGENT_INIT_ENTER_SMI:
SaveDebugRegister ();
if (!mSmmDebugIdtInitFlag) {
//
// We only need to initialize Debug IDT table at first SMI entry
// after SMM relocation.
//
InitializeDebugIdt ();
mSmmDebugIdtInitFlag = TRUE;
}
//
// Check if CPU APIC Timer is working, otherwise initialize it.
//
InitializeLocalApicSoftwareEnable (TRUE);
GetApicTimerState (NULL, &PeriodicMode, NULL);
TimerCycle = GetApicTimerInitCount ();
if (!PeriodicMode || TimerCycle == 0) {
InitializeDebugTimer (NULL, FALSE);
}
Mailbox = GetMailboxPointer ();
if (GetDebugFlag (DEBUG_AGENT_FLAG_AGENT_IN_PROGRESS) == 1) {
//
// If Debug Agent has been communicaton state with HOST, we need skip
// any break points set in SMM, set Skip Breakpoint flag
//
mSkipBreakpoint = TRUE;
}
if (GetDebugFlag (DEBUG_AGENT_FLAG_BREAK_ON_NEXT_SMI) == 1) {
if (mSkipBreakpoint) {
//
// Print warning message if ignore smm entry break
//
DebugPortWriteBuffer ((DEBUG_PORT_HANDLE) (UINTN)Mailbox->DebugPortHandle,
(UINT8 *)mWarningMsgIgnoreSmmEntryBreak,
AsciiStrLen (mWarningMsgIgnoreSmmEntryBreak)
);
} else {
//
// If SMM entry break is set, SMM code will be break at here.
//
CpuBreakpoint ();
}
}
break;
case DEBUG_AGENT_INIT_EXIT_SMI:
Mailbox = GetMailboxPointer ();
//
// Clear Skip Breakpoint flag
//
mSkipBreakpoint = FALSE;
RestoreDebugRegister ();
break;
case DEBUG_AGENT_INIT_THUNK_PEI_IA32TOX64:
if (Context == NULL) {
DEBUG ((EFI_D_ERROR, "DebugAgent: Input parameter Context cannot be NULL!\n"));
CpuDeadLoop ();
} else {
Ia32Idtr = (IA32_DESCRIPTOR *) Context;
Ia32IdtEntry = (IA32_IDT_ENTRY *)(Ia32Idtr->Base);
MailboxLocation = (UINT64 *) (UINTN) (Ia32IdtEntry[DEBUG_MAILBOX_VECTOR].Bits.OffsetLow +
(UINT32) (Ia32IdtEntry[DEBUG_MAILBOX_VECTOR].Bits.OffsetHigh << 16));
mMailboxPointer = (DEBUG_AGENT_MAILBOX *)(UINTN)(*MailboxLocation);
VerifyMailboxChecksum (mMailboxPointer);
//
// Get original IDT address and size.
//
AsmReadIdtr ((IA32_DESCRIPTOR *) &Idtr);
IdtEntryCount = (UINT16) ((Idtr.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR));
if (IdtEntryCount < 33) {
Idtr.Limit = (UINT16) (sizeof (IA32_IDT_GATE_DESCRIPTOR) * 33 - 1);
Idtr.Base = (UINTN) &mIdtEntryTable;
ZeroMem (&mIdtEntryTable, Idtr.Limit + 1);
AsmWriteIdtr ((IA32_DESCRIPTOR *) &Idtr);
}
InitializeDebugIdt ();
//
// Initialize Debug Timer hardware and save its frequency
//
InitializeDebugTimer (&DebugTimerFrequency, TRUE);
UpdateMailboxContent (mMailboxPointer, DEBUG_MAILBOX_DEBUG_TIMER_FREQUENCY, DebugTimerFrequency);
//
// Enable Debug Timer interrupt and CPU interrupt
//
SaveAndSetDebugTimerInterrupt (TRUE);
EnableInterrupts ();
FindAndReportModuleImageInfo (SIZE_4KB);
}
break;
default:
//
// Only DEBUG_AGENT_INIT_PREMEM_SEC and DEBUG_AGENT_INIT_POSTMEM_SEC are allowed for this
// Debug Agent library instance.
//
DEBUG ((EFI_D_ERROR, "Debug Agent: The InitFlag value is not allowed!\n"));
CpuDeadLoop ();
break;
}
}
/**
Initialize debug agent.
This function is used to set up debug enviroment for DXE phase.
If this function is called by DXE Core, Context must be the pointer
to HOB list which will be used to get GUIDed HOB. It will enable
interrupt to support break-in feature.
If this function is called by DXE module, Context must be NULL. It
will enable interrupt to support break-in feature.
@param[in] InitFlag Init flag is used to decide initialize process.
@param[in] Context Context needed according to InitFlag.
@param[in] Function Continue function called by debug agent library; it was
optional.
**/
VOID
EFIAPI
InitializeDebugAgent (
IN UINT32 InitFlag,
IN VOID *Context, OPTIONAL
IN DEBUG_AGENT_CONTINUE Function OPTIONAL
)
{
DEBUG_AGENT_MAILBOX *Mailbox;
IA32_DESCRIPTOR Idtr;
UINT16 IdtEntryCount;
BOOLEAN InterruptStatus;
if (InitFlag != DEBUG_AGENT_INIT_DXE_CORE &&
InitFlag != DEBUG_AGENT_INIT_S3 &&
InitFlag != DEBUG_AGENT_INIT_DXE_AP) {
return;
}
//
// Save and disable original interrupt status
//
InterruptStatus = SaveAndDisableInterrupts ();
if (InitFlag == DEBUG_AGENT_INIT_DXE_CORE) {
//
// Try to get Mailbox from GUIDed HOB.
//
mDxeCoreFlag = TRUE;
Mailbox = GetMailboxFromHob (Context);
//
// Clear Break CPU index value
//
mDebugMpContext.BreakAtCpuIndex = (UINT32) -1;
} else if (InitFlag == DEBUG_AGENT_INIT_DXE_AP) {
EnableInterrupts ();
return;
} else {
//
// If it is in S3 path, needn't to install configuration table.
//
Mailbox = NULL;
}
if (Mailbox != NULL) {
//
// If Mailbox exists, copy it into one global variable.
//
CopyMem (&mMailbox, Mailbox, sizeof (DEBUG_AGENT_MAILBOX));
} else {
//
// If Mailbox not exists, used the local Mailbox.
//
ZeroMem (&mMailbox, sizeof (DEBUG_AGENT_MAILBOX));
}
mMailboxPointer = &mMailbox;
//
// Get original IDT address and size.
//
AsmReadIdtr ((IA32_DESCRIPTOR *) &Idtr);
IdtEntryCount = (UINT16) ((Idtr.Limit + 1) / sizeof (IA32_IDT_GATE_DESCRIPTOR));
if (IdtEntryCount < 33) {
Idtr.Limit = (UINT16) (sizeof (IA32_IDT_GATE_DESCRIPTOR) * 33 - 1);
Idtr.Base = (UINTN) &mIdtEntryTable;
ZeroMem (&mIdtEntryTable, Idtr.Limit + 1);
AsmWriteIdtr ((IA32_DESCRIPTOR *) &Idtr);
}
//
// Initialize the IDT table entries to support source level debug.
//
InitializeDebugIdt ();
//
// Initialize debug communication port
//
mMailboxPointer->DebugPortHandle = (UINT64) (UINTN)DebugPortInitialize ((VOID *)(UINTN)mMailbox.DebugPortHandle, NULL);
InitializeSpinLock (&mDebugMpContext.MpContextSpinLock);
InitializeSpinLock (&mDebugMpContext.DebugPortSpinLock);
if (InitFlag == DEBUG_AGENT_INIT_DXE_CORE) {
//
// Initialize Debug Timer hardware and enable interrupt.
//
InitializeDebugTimer ();
EnableInterrupts ();
return;
} else {
//
// Disable Debug Timer interrupt in S3 path.
//
SaveAndSetDebugTimerInterrupt (FALSE);
//
// Restore interrupt state.
//
SetInterruptState (InterruptStatus);
}
}
