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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
logger.c
Abstract:
This file contains the code for the debug logging facility.
Author:
Steve Wood (stevewo) 20-Jun-1992
Environment:
kernel mode callable only.
Revision History:
20-Jun-1992 Steve Wood (stevewo) Created.
--*/
#include "exp.h"
PEX_DEBUG_LOG
ExCreateDebugLog(
IN UCHAR MaximumNumberOfTags,
IN ULONG MaximumNumberOfEvents
)
{
PEX_DEBUG_LOG Log;
ULONG Size;
Size = sizeof( EX_DEBUG_LOG ) +
(MaximumNumberOfTags *
sizeof( EX_DEBUG_LOG_TAG )
) +
(MaximumNumberOfEvents *
sizeof( EX_DEBUG_LOG_EVENT )
);
Log = ExAllocatePool( NonPagedPool, Size );
if (Log != NULL) {
RtlZeroMemory( Log, Size );
KeInitializeSpinLock( &Log->Lock );
Log->MaximumNumberOfTags = MaximumNumberOfTags;
Log->Tags = (PEX_DEBUG_LOG_TAG)(Log + 1);
Log->First = (PEX_DEBUG_LOG_EVENT)(Log->Tags + MaximumNumberOfTags);
Log->Last = Log->First + MaximumNumberOfEvents;
Log->Next = Log->First;
}
return Log;
}
UCHAR
ExCreateDebugLogTag(
IN PEX_DEBUG_LOG Log,
IN PCHAR Name,
IN UCHAR Format1,
IN UCHAR Format2,
IN UCHAR Format3,
IN UCHAR Format4
)
{
KIRQL OldIrql;
ULONG Size;
PEX_DEBUG_LOG_TAG Tag;
UCHAR TagIndex;
PCHAR CapturedName;
Size = strlen( Name );
CapturedName = ExAllocatePool( NonPagedPool, Size );
RtlMoveMemory( CapturedName, Name, Size + 1 );
ExAcquireSpinLock( &Log->Lock, &OldIrql );
if (Log->NumberOfTags < Log->MaximumNumberOfTags) {
TagIndex = (UCHAR)(Log->NumberOfTags++);
Tag = &Log->Tags[ TagIndex ];
Tag->Name = CapturedName;
Tag->Format[ 0 ] = Format1;
Tag->Format[ 1 ] = Format2;
Tag->Format[ 2 ] = Format3;
Tag->Format[ 3 ] = Format4;
CapturedName = NULL;
}
else {
TagIndex = (UCHAR)0xFF;
}
ExReleaseSpinLock( &Log->Lock, OldIrql );
if (CapturedName != NULL) {
ExFreePool( CapturedName );
}
return TagIndex;
}
VOID
ExDebugLogEvent(
IN PEX_DEBUG_LOG Log,
IN UCHAR Tag,
IN ULONG Data1,
IN ULONG Data2,
IN ULONG Data3,
IN ULONG Data4
)
{
KIRQL OldIrql;
PEX_DEBUG_LOG_EVENT p;
PETHREAD Thread = PsGetCurrentThread();
LARGE_INTEGER CurrentTime;
KeQuerySystemTime( &CurrentTime );
ExAcquireSpinLock( &Log->Lock, &OldIrql );
p = Log->Next;
if (p == Log->Last) {
p = Log->First;
}
Log->Next = p + 1;
p->ThreadId = Thread->Cid.UniqueThread;
p->ProcessId = Thread->Cid.UniqueProcess;
p->Time = CurrentTime.LowPart;
p->Tag = Tag;
p->Data[ 0 ] = Data1;
p->Data[ 1 ] = Data2;
p->Data[ 2 ] = Data3;
p->Data[ 3 ] = Data4;
ExReleaseSpinLock( &Log->Lock, OldIrql );
return;
}
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