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reactos/ntoskrnl/kd/kdio.c
Jérôme Gardou 835c30232e [NTOS:KD][NTOS:KD64][NTOS:KDBG] Fix IRQL & spinlock use 
KD64: Raise to HIGH_LEVEL when entering trap
KDBG: lower to DISPATCH_LEVEL when applying IRQL hack & use a worker thread to load symbols
KD&KDBG: Actually unload symbols when required
2021-06-29 11:49:20 +02:00

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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: ntoskrnl/kd/kdio.c
* PURPOSE: NT Kernel Debugger Input/Output Functions
*
* PROGRAMMERS: Alex Ionescu (alex@relsoft.net)
*/
/* INCLUDES ******************************************************************/
#include <ntoskrnl.h>
#include <reactos/buildno.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS *******************************************************************/
#define KdpBufferSize (1024 * 512)
static BOOLEAN KdpLoggingEnabled = FALSE;
static BOOLEAN KdpLoggingStarting = FALSE;
static PCHAR KdpDebugBuffer = NULL;
static volatile ULONG KdpCurrentPosition = 0;
static volatile ULONG KdpFreeBytes = 0;
static KSPIN_LOCK KdpDebugLogSpinLock;
static KEVENT KdpLoggerThreadEvent;
static HANDLE KdpLogFileHandle;
ANSI_STRING KdpLogFileName = RTL_CONSTANT_STRING("\\SystemRoot\\debug.log");
extern ULONG ExpInitializationPhase;
static KSPIN_LOCK KdpSerialSpinLock;
ULONG SerialPortNumber = DEFAULT_DEBUG_PORT;
CPPORT SerialPortInfo = {0, DEFAULT_DEBUG_BAUD_RATE, 0};
#define KdpScreenLineLengthDefault 80
static CHAR KdpScreenLineBuffer[KdpScreenLineLengthDefault + 1] = "";
static ULONG KdpScreenLineBufferPos = 0, KdpScreenLineLength = 0;
const ULONG KdpDmesgBufferSize = 128 * 1024; // 512*1024; // 5*1024*1024;
PCHAR KdpDmesgBuffer = NULL;
volatile ULONG KdpDmesgCurrentPosition = 0;
volatile ULONG KdpDmesgFreeBytes = 0;
volatile ULONG KdbDmesgTotalWritten = 0;
volatile BOOLEAN KdbpIsInDmesgMode = FALSE;
static KSPIN_LOCK KdpDmesgLogSpinLock;
KDP_DEBUG_MODE KdpDebugMode;
LIST_ENTRY KdProviders = {&KdProviders, &KdProviders};
KD_DISPATCH_TABLE DispatchTable[KdMax];
PKDP_INIT_ROUTINE InitRoutines[KdMax] = {KdpScreenInit,
KdpSerialInit,
KdpDebugLogInit,
KdpKdbgInit};
static ULONG KdbgNextApiNumber = DbgKdContinueApi;
static CONTEXT KdbgContext;
static EXCEPTION_RECORD64 KdbgExceptionRecord;
static BOOLEAN KdbgFirstChanceException;
static NTSTATUS KdbgContinueStatus = STATUS_SUCCESS;
/* LOCKING FUNCTIONS *********************************************************/
KIRQL
NTAPI
KdpAcquireLock(IN PKSPIN_LOCK SpinLock)
{
KIRQL OldIrql;
/* Acquire the spinlock without waiting at raised IRQL */
while (TRUE)
{
/* Loop until the spinlock becomes available */
while (!KeTestSpinLock(SpinLock));
/* Spinlock is free, raise IRQL to high level */
KeRaiseIrql(HIGH_LEVEL, &OldIrql);
/* Try to get the spinlock */
if (KeTryToAcquireSpinLockAtDpcLevel(SpinLock))
break;
/* Someone else got the spinlock, lower IRQL back */
KeLowerIrql(OldIrql);
}
return OldIrql;
}
VOID
NTAPI
KdpReleaseLock(IN PKSPIN_LOCK SpinLock,
IN KIRQL OldIrql)
{
/* Release the spinlock */
KiReleaseSpinLock(SpinLock);
// KeReleaseSpinLockFromDpcLevel(SpinLock);
/* Restore the old IRQL */
KeLowerIrql(OldIrql);
}
/* FILE DEBUG LOG FUNCTIONS **************************************************/
static VOID
NTAPI
KdpLoggerThread(PVOID Context)
{
ULONG beg, end, num;
IO_STATUS_BLOCK Iosb;
ASSERT(ExGetPreviousMode() == KernelMode);
KdpLoggingEnabled = TRUE;
while (TRUE)
{
KeWaitForSingleObject(&KdpLoggerThreadEvent, Executive, KernelMode, FALSE, NULL);
/* Bug */
/* Keep KdpCurrentPosition and KdpFreeBytes values in local
* variables to avoid their possible change from Producer part,
* KdpPrintToLogFile function
*/
end = KdpCurrentPosition;
num = KdpFreeBytes;
/* Now securely calculate values, based on local variables */
beg = (end + num) % KdpBufferSize;
num = KdpBufferSize - num;
/* Nothing to do? */
if (num == 0)
continue;
if (end > beg)
{
NtWriteFile(KdpLogFileHandle, NULL, NULL, NULL, &Iosb,
KdpDebugBuffer + beg, num, NULL, NULL);
}
else
{
NtWriteFile(KdpLogFileHandle, NULL, NULL, NULL, &Iosb,
KdpDebugBuffer + beg, KdpBufferSize - beg, NULL, NULL);
NtWriteFile(KdpLogFileHandle, NULL, NULL, NULL, &Iosb,
KdpDebugBuffer, end, NULL, NULL);
}
(VOID)InterlockedExchangeAddUL(&KdpFreeBytes, num);
}
}
static VOID
NTAPI
KdpPrintToLogFile(PCHAR String,
ULONG StringLength)
{
KIRQL OldIrql;
ULONG beg, end, num;
BOOLEAN DoReinit = FALSE;
if (KdpDebugBuffer == NULL) return;
/* Acquire the printing spinlock without waiting at raised IRQL */
OldIrql = KdpAcquireLock(&KdpDebugLogSpinLock);
beg = KdpCurrentPosition;
num = KdpFreeBytes;
if (StringLength < num)
num = StringLength;
if (num != 0)
{
end = (beg + num) % KdpBufferSize;
KdpCurrentPosition = end;
KdpFreeBytes -= num;
if (end > beg)
{
RtlCopyMemory(KdpDebugBuffer + beg, String, num);
}
else
{
RtlCopyMemory(KdpDebugBuffer + beg, String, KdpBufferSize - beg);
RtlCopyMemory(KdpDebugBuffer, String + KdpBufferSize - beg, end);
}
}
/* Release the spinlock */
if (OldIrql == PASSIVE_LEVEL && !KdpLoggingStarting && !KdpLoggingEnabled && ExpInitializationPhase >= 2)
{
DoReinit = TRUE;
}
KdpReleaseLock(&KdpDebugLogSpinLock, OldIrql);
if (DoReinit)
{
KdpLoggingStarting = TRUE;
KdpDebugLogInit(NULL, 3);
}
/* Signal the logger thread */
if (OldIrql <= DISPATCH_LEVEL && KdpLoggingEnabled)
KeSetEvent(&KdpLoggerThreadEvent, IO_NO_INCREMENT, FALSE);
}
VOID
NTAPI
KdpDebugLogInit(PKD_DISPATCH_TABLE DispatchTable,
ULONG BootPhase)
{
NTSTATUS Status;
UNICODE_STRING FileName;
OBJECT_ATTRIBUTES ObjectAttributes;
IO_STATUS_BLOCK Iosb;
HANDLE ThreadHandle;
KPRIORITY Priority;
if (!KdpDebugMode.File) return;
if (BootPhase == 0)
{
KdComPortInUse = NULL;
/* Write out the functions that we support for now */
DispatchTable->KdpInitRoutine = KdpDebugLogInit;
DispatchTable->KdpPrintRoutine = KdpPrintToLogFile;
/* Register as a Provider */
InsertTailList(&KdProviders, &DispatchTable->KdProvidersList);
}
else if (BootPhase == 1)
{
/* Allocate a buffer for debug log */
KdpDebugBuffer = ExAllocatePool(NonPagedPool, KdpBufferSize);
KdpFreeBytes = KdpBufferSize;
/* Initialize spinlock */
KeInitializeSpinLock(&KdpDebugLogSpinLock);
HalDisplayString("\r\n File log debugging enabled\r\n\r\n");
}
else if (BootPhase == 3)
{
/* Setup the log name */
Status = RtlAnsiStringToUnicodeString(&FileName, &KdpLogFileName, TRUE);
if (!NT_SUCCESS(Status)) return;
InitializeObjectAttributes(&ObjectAttributes,
&FileName,
OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,
NULL,
NULL);
/* Create the log file */
Status = ZwCreateFile(&KdpLogFileHandle,
FILE_APPEND_DATA | SYNCHRONIZE,
&ObjectAttributes,
&Iosb,
NULL,
FILE_ATTRIBUTE_NORMAL,
FILE_SHARE_READ,
FILE_SUPERSEDE,
FILE_WRITE_THROUGH | FILE_SYNCHRONOUS_IO_NONALERT,
NULL,
0);
RtlFreeUnicodeString(&FileName);
if (!NT_SUCCESS(Status))
{
DPRINT1("Failed to open log file: 0x%08x\n", Status);
return;
}
KeInitializeEvent(&KdpLoggerThreadEvent, SynchronizationEvent, TRUE);
/* Create the logger thread */
Status = PsCreateSystemThread(&ThreadHandle,
THREAD_ALL_ACCESS,
NULL,
NULL,
NULL,
KdpLoggerThread,
NULL);
if (!NT_SUCCESS(Status))
{
ZwClose(KdpLogFileHandle);
return;
}
Priority = 7;
ZwSetInformationThread(ThreadHandle,
ThreadPriority,
&Priority,
sizeof(Priority));
ZwClose(ThreadHandle);
}
}
/* SERIAL FUNCTIONS **********************************************************/
VOID
NTAPI
KdpSerialDebugPrint(PCHAR Message,
ULONG Length)
{
PCHAR pch = (PCHAR)Message;
KIRQL OldIrql;
/* Acquire the printing spinlock without waiting at raised IRQL */
OldIrql = KdpAcquireLock(&KdpSerialSpinLock);
/* Output the message */
while (pch < Message + Length && *pch != '\0')
{
if (*pch == '\n')
{
KdPortPutByteEx(&SerialPortInfo, '\r');
}
KdPortPutByteEx(&SerialPortInfo, *pch);
pch++;
}
/* Release the spinlock */
KdpReleaseLock(&KdpSerialSpinLock, OldIrql);
}
VOID
NTAPI
KdpSerialInit(PKD_DISPATCH_TABLE DispatchTable,
ULONG BootPhase)
{
if (!KdpDebugMode.Serial) return;
if (BootPhase == 0)
{
/* Write out the functions that we support for now */
DispatchTable->KdpInitRoutine = KdpSerialInit;
DispatchTable->KdpPrintRoutine = KdpSerialDebugPrint;
/* Initialize the Port */
if (!KdPortInitializeEx(&SerialPortInfo, SerialPortNumber))
{
KdpDebugMode.Serial = FALSE;
return;
}
KdComPortInUse = SerialPortInfo.Address;
/* Initialize spinlock */
KeInitializeSpinLock(&KdpSerialSpinLock);
/* Register as a Provider */
InsertTailList(&KdProviders, &DispatchTable->KdProvidersList);
}
else if (BootPhase == 1)
{
HalDisplayString("\r\n Serial debugging enabled\r\n\r\n");
}
}
/* SCREEN FUNCTIONS **********************************************************/
VOID
KdpScreenAcquire(VOID)
{
if (InbvIsBootDriverInstalled() /* &&
!InbvCheckDisplayOwnership() */)
{
/* Acquire ownership and reset the display */
InbvAcquireDisplayOwnership();
InbvResetDisplay();
InbvSolidColorFill(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1, BV_COLOR_BLACK);
InbvSetTextColor(BV_COLOR_WHITE);
InbvInstallDisplayStringFilter(NULL);
InbvEnableDisplayString(TRUE);
InbvSetScrollRegion(0, 0, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1);
}
}
// extern VOID NTAPI InbvSetDisplayOwnership(IN BOOLEAN DisplayOwned);
VOID
KdpScreenRelease(VOID)
{
if (InbvIsBootDriverInstalled()&&
InbvCheckDisplayOwnership())
{
/* Release the display */
// InbvSetDisplayOwnership(FALSE);
InbvNotifyDisplayOwnershipLost(NULL);
}
}
/*
* Screen debug logger function KdpScreenPrint() writes text messages into
* KdpDmesgBuffer, using it as a circular buffer. KdpDmesgBuffer contents could
* be later (re)viewed using dmesg command of kdbg. KdpScreenPrint() protects
* KdpDmesgBuffer from simultaneous writes by use of KdpDmesgLogSpinLock.
*/
static VOID
NTAPI
KdpScreenPrint(PCHAR Message,
ULONG Length)
{
PCHAR pch = (PCHAR)Message;
KIRQL OldIrql;
ULONG beg, end, num;
while (pch < Message + Length && *pch)
{
if (*pch == '\b')
{
/* HalDisplayString does not support '\b'. Workaround it and use '\r' */
if (KdpScreenLineLength > 0)
{
/* Remove last character from buffer */
KdpScreenLineBuffer[--KdpScreenLineLength] = '\0';
KdpScreenLineBufferPos = KdpScreenLineLength;
/* Clear row and print line again */
HalDisplayString("\r");
HalDisplayString(KdpScreenLineBuffer);
}
}
else
{
KdpScreenLineBuffer[KdpScreenLineLength++] = *pch;
KdpScreenLineBuffer[KdpScreenLineLength] = '\0';
}
if (*pch == '\n' || KdpScreenLineLength == KdpScreenLineLengthDefault)
{
/* Print buffered characters */
if (KdpScreenLineBufferPos != KdpScreenLineLength)
HalDisplayString(KdpScreenLineBuffer + KdpScreenLineBufferPos);
/* Clear line buffer */
KdpScreenLineBuffer[0] = '\0';
KdpScreenLineLength = KdpScreenLineBufferPos = 0;
}
++pch;
}
/* Print buffered characters */
if (KdpScreenLineBufferPos != KdpScreenLineLength)
{
HalDisplayString(KdpScreenLineBuffer + KdpScreenLineBufferPos);
KdpScreenLineBufferPos = KdpScreenLineLength;
}
/* Dmesg: store Message in the buffer to show it later */
if (KdbpIsInDmesgMode)
return;
if (KdpDmesgBuffer == NULL)
return;
/* Acquire the printing spinlock without waiting at raised IRQL */
OldIrql = KdpAcquireLock(&KdpDmesgLogSpinLock);
/* Invariant: always_true(KdpDmesgFreeBytes == KdpDmesgBufferSize);
* set num to min(KdpDmesgFreeBytes, Length).
*/
num = (Length < KdpDmesgFreeBytes) ? Length : KdpDmesgFreeBytes;
beg = KdpDmesgCurrentPosition;
if (num != 0)
{
end = (beg + num) % KdpDmesgBufferSize;
if (end > beg)
{
RtlCopyMemory(KdpDmesgBuffer + beg, Message, Length);
}
else
{
RtlCopyMemory(KdpDmesgBuffer + beg, Message, KdpDmesgBufferSize - beg);
RtlCopyMemory(KdpDmesgBuffer, Message + (KdpDmesgBufferSize - beg), end);
}
KdpDmesgCurrentPosition = end;
/* Counting the total bytes written */
KdbDmesgTotalWritten += num;
}
/* Release the spinlock */
KdpReleaseLock(&KdpDmesgLogSpinLock, OldIrql);
/* Optional step(?): find out a way to notify about buffer exhaustion,
* and possibly fall into kbd to use dmesg command: user will read
* debug messages before they will be wiped over by next writes.
*/
}
VOID
NTAPI
KdpScreenInit(PKD_DISPATCH_TABLE DispatchTable,
ULONG BootPhase)
{
if (!KdpDebugMode.Screen) return;
if (BootPhase == 0)
{
/* Write out the functions that we support for now */
DispatchTable->KdpInitRoutine = KdpScreenInit;
DispatchTable->KdpPrintRoutine = KdpScreenPrint;
/* Register as a Provider */
InsertTailList(&KdProviders, &DispatchTable->KdProvidersList);
}
else if (BootPhase == 1)
{
/* Allocate a buffer for dmesg log buffer. +1 for terminating null,
* see kdbp_cli.c:KdbpCmdDmesg()/2
*/
KdpDmesgBuffer = ExAllocatePool(NonPagedPool, KdpDmesgBufferSize + 1);
RtlZeroMemory(KdpDmesgBuffer, KdpDmesgBufferSize + 1);
KdpDmesgFreeBytes = KdpDmesgBufferSize;
KdbDmesgTotalWritten = 0;
/* Take control of the display */
KdpScreenAcquire();
/* Initialize spinlock */
KeInitializeSpinLock(&KdpDmesgLogSpinLock);
HalDisplayString("\r\n Screen debugging enabled\r\n\r\n");
}
}
/* GENERAL FUNCTIONS *********************************************************/
BOOLEAN
NTAPI
KdpPrintString(
_In_ PSTRING Output);
extern STRING KdbPromptString;
VOID
NTAPI
KdSendPacket(
IN ULONG PacketType,
IN PSTRING MessageHeader,
IN PSTRING MessageData,
IN OUT PKD_CONTEXT Context)
{
if (PacketType == PACKET_TYPE_KD_DEBUG_IO)
{
PSTRING Output = MessageData;
PLIST_ENTRY CurrentEntry;
PKD_DISPATCH_TABLE CurrentTable;
if (!KdpDebugMode.Value) return;
/* Call the registered handlers */
CurrentEntry = KdProviders.Flink;
while (CurrentEntry != &KdProviders)
{
/* Get the current table */
CurrentTable = CONTAINING_RECORD(CurrentEntry,
KD_DISPATCH_TABLE,
KdProvidersList);
/* Call it */
CurrentTable->KdpPrintRoutine(Output->Buffer, Output->Length);
/* Next Table */
CurrentEntry = CurrentEntry->Flink;
}
return;
}
else if (PacketType == PACKET_TYPE_KD_STATE_CHANGE64)
{
PDBGKD_ANY_WAIT_STATE_CHANGE WaitStateChange = (PDBGKD_ANY_WAIT_STATE_CHANGE)MessageHeader->Buffer;
if (WaitStateChange->NewState == DbgKdLoadSymbolsStateChange)
{
#ifdef KDBG
PLDR_DATA_TABLE_ENTRY LdrEntry;
/* Load symbols. Currently implemented only for KDBG! */
if (KdbpSymFindModule((PVOID)(ULONG_PTR)WaitStateChange->u.LoadSymbols.BaseOfDll, -1, &LdrEntry))
{
KdbSymProcessSymbols(LdrEntry, !WaitStateChange->u.LoadSymbols.UnloadSymbols);
}
#endif
return;
}
else if (WaitStateChange->NewState == DbgKdExceptionStateChange)
{
KdbgNextApiNumber = DbgKdGetContextApi;
KdbgExceptionRecord = WaitStateChange->u.Exception.ExceptionRecord;
KdbgFirstChanceException = WaitStateChange->u.Exception.FirstChance;
return;
}
}
else if (PacketType == PACKET_TYPE_KD_STATE_MANIPULATE)
{
PDBGKD_MANIPULATE_STATE64 ManipulateState = (PDBGKD_MANIPULATE_STATE64)MessageHeader->Buffer;
if (ManipulateState->ApiNumber == DbgKdGetContextApi)
{
KD_CONTINUE_TYPE Result;
#ifdef KDBG
/* Check if this is an assertion failure */
if (KdbgExceptionRecord.ExceptionCode == STATUS_ASSERTION_FAILURE)
{
/* Bump EIP to the instruction following the int 2C */
KeSetContextPc(&KdbgContext, KeGetContextPc(&KdbgContext) + 2);
}
Result = KdbEnterDebuggerException(&KdbgExceptionRecord,
KdbgContext.SegCs & 1,
&KdbgContext,
KdbgFirstChanceException);
#else
/* We'll manually dump the stack for the user... */
KeRosDumpStackFrames(NULL, 0);
Result = kdHandleException;
#endif
if (Result != kdHandleException)
KdbgContinueStatus = STATUS_SUCCESS;
else
KdbgContinueStatus = STATUS_UNSUCCESSFUL;
KdbgNextApiNumber = DbgKdSetContextApi;
return;
}
else if (ManipulateState->ApiNumber == DbgKdSetContextApi)
{
KdbgNextApiNumber = DbgKdContinueApi;
return;
}
}
UNIMPLEMENTED;
}
KDSTATUS
NTAPI
KdReceivePacket(
IN ULONG PacketType,
OUT PSTRING MessageHeader,
OUT PSTRING MessageData,
OUT PULONG DataLength,
IN OUT PKD_CONTEXT Context)
{
#ifdef KDBG
KIRQL OldIrql;
STRING StringChar;
CHAR Response;
USHORT i;
ULONG DummyScanCode;
CHAR MessageBuffer[100];
STRING ResponseString;
#endif
if (PacketType == PACKET_TYPE_KD_STATE_MANIPULATE)
{
PDBGKD_MANIPULATE_STATE64 ManipulateState = (PDBGKD_MANIPULATE_STATE64)MessageHeader->Buffer;
RtlZeroMemory(MessageHeader->Buffer, MessageHeader->MaximumLength);
if (KdbgNextApiNumber == DbgKdGetContextApi)
{
ManipulateState->ApiNumber = DbgKdGetContextApi;
MessageData->Length = 0;
MessageData->Buffer = (PCHAR)&KdbgContext;
return KdPacketReceived;
}
else if (KdbgNextApiNumber == DbgKdSetContextApi)
{
ManipulateState->ApiNumber = DbgKdSetContextApi;
MessageData->Length = sizeof(KdbgContext);
MessageData->Buffer = (PCHAR)&KdbgContext;
return KdPacketReceived;
}
else if (KdbgNextApiNumber != DbgKdContinueApi)
{
UNIMPLEMENTED;
}
ManipulateState->ApiNumber = DbgKdContinueApi;
ManipulateState->u.Continue.ContinueStatus = KdbgContinueStatus;
/* Prepare for next time */
KdbgNextApiNumber = DbgKdContinueApi;
KdbgContinueStatus = STATUS_SUCCESS;
return KdPacketReceived;
}
if (PacketType != PACKET_TYPE_KD_DEBUG_IO)
return KdPacketTimedOut;
#ifdef KDBG
ResponseString.Buffer = MessageBuffer;
ResponseString.Length = 0;
ResponseString.MaximumLength = min(sizeof(MessageBuffer), MessageData->MaximumLength);
StringChar.Buffer = &Response;
StringChar.Length = StringChar.MaximumLength = sizeof(Response);
/* Display the string and print a new line for log neatness */
*StringChar.Buffer = '\n';
KdpPrintString(&StringChar);
/* Print the kdb prompt */
KdpPrintString(&KdbPromptString);
// TODO: Use an improved KdbpReadCommand() function for our purposes.
/* Acquire the printing spinlock without waiting at raised IRQL */
OldIrql = KdpAcquireLock(&KdpSerialSpinLock);
if (!(KdbDebugState & KD_DEBUG_KDSERIAL))
KbdDisableMouse();
/* Loop the whole string */
for (i = 0; i < ResponseString.MaximumLength; i++)
{
/* Check if this is serial debugging mode */
if (KdbDebugState & KD_DEBUG_KDSERIAL)
{
/* Get the character from serial */
do
{
Response = KdbpTryGetCharSerial(MAXULONG);
} while (Response == -1);
}
else
{
/* Get the response from the keyboard */
do
{
Response = KdbpTryGetCharKeyboard(&DummyScanCode, MAXULONG);
} while (Response == -1);
}
/* Check for return */
if (Response == '\r')
{
/*
* We might need to discard the next '\n'.
* Wait a bit to make sure we receive it.
*/
KeStallExecutionProcessor(100000);
/* Check the mode */
if (KdbDebugState & KD_DEBUG_KDSERIAL)
{
/* Read and discard the next character, if any */
KdbpTryGetCharSerial(5);
}
else
{
/* Read and discard the next character, if any */
KdbpTryGetCharKeyboard(&DummyScanCode, 5);
}
/*
* Null terminate the output string -- documentation states that
* DbgPrompt does not null terminate, but it does
*/
*(PCHAR)(ResponseString.Buffer + i) = 0;
break;
}
/* Write it back and print it to the log */
*(PCHAR)(ResponseString.Buffer + i) = Response;
KdpReleaseLock(&KdpSerialSpinLock, OldIrql);
KdpPrintString(&StringChar);
OldIrql = KdpAcquireLock(&KdpSerialSpinLock);
}
/* Release the spinlock */
KdpReleaseLock(&KdpSerialSpinLock, OldIrql);
/* Print a new line */
*StringChar.Buffer = '\n';
KdpPrintString(&StringChar);
/* Return the length */
RtlCopyMemory(MessageData->Buffer, ResponseString.Buffer, i);
*DataLength = i;
if (!(KdbDebugState & KD_DEBUG_KDSERIAL))
KbdEnableMouse();
#endif
return KdPacketReceived;
}
/* EOF */
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