VOID
NTAPI
InbvAcquireLock(VOID)
{
KIRQL OldIrql;
/* Check if we're at dispatch level or lower */
OldIrql = KeGetCurrentIrql();
if (OldIrql <= DISPATCH_LEVEL)
{
/* Loop until the lock is free */
while (!KeTestSpinLock(&BootDriverLock));
/* Raise IRQL to dispatch level */
KeRaiseIrql(DISPATCH_LEVEL, &OldIrql);
}
/* Acquire the lock */
KiAcquireSpinLock(&BootDriverLock);
InbvOldIrql = OldIrql;
}
VOID
KdLogDbgPrint(
IN PSTRING String
)
{
KIRQL OldIrql;
ULONG Length;
ULONG LengthCopied;
for (; ;) {
if (KeTestSpinLock (&KdpPrintSpinLock)) {
KeRaiseIrql (HIGH_LEVEL, &OldIrql);
if (KiTryToAcquireSpinLock(&KdpPrintSpinLock)) {
break; // got the lock
}
KeLowerIrql(OldIrql);
}
}
if (KdPrintCircularBuffer) {
Length = String->Length;
//
// truncate ridiculous strings
//
if (Length > KDPRINTBUFFERSIZE) {
Length = KDPRINTBUFFERSIZE;
}
if (KdPrintWritePointer + Length <= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
LengthCopied = KdpMoveMemory(KdPrintWritePointer, String->Buffer, Length);
KdPrintWritePointer += LengthCopied;
if (KdPrintWritePointer >= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
KdPrintWritePointer = KdPrintCircularBuffer;
KdPrintRolloverCount++;
}
} else {
ULONG First = (ULONG)(KdPrintCircularBuffer + KDPRINTBUFFERSIZE - KdPrintWritePointer);
LengthCopied = KdpMoveMemory(KdPrintWritePointer,
String->Buffer,
First);
if (LengthCopied == First) {
LengthCopied += KdpMoveMemory(KdPrintCircularBuffer,
String->Buffer + First,
Length - First);
}
if (LengthCopied > First) {
KdPrintWritePointer = KdPrintCircularBuffer + LengthCopied - First;
KdPrintRolloverCount++;
} else {
KdPrintWritePointer += LengthCopied;
if (KdPrintWritePointer >= KdPrintCircularBuffer+KDPRINTBUFFERSIZE) {
KdPrintWritePointer = KdPrintCircularBuffer;
KdPrintRolloverCount++;
}
}
}
}
KiReleaseSpinLock(&KdpPrintSpinLock);
KeLowerIrql(OldIrql);
}
