NTSTATUS PdoPortQueryDevText(
IN PC0C_PDOPORT_EXTENSION pDevExt,
IN PIRP pIrp,
IN PIO_STACK_LOCATION pIrpStack)
{
NTSTATUS status;
status = STATUS_SUCCESS;
switch (pIrpStack->Parameters.QueryDeviceText.DeviceTextType) {
case DeviceTextDescription:
if (!pIrp->IoStatus.Information) {
UNICODE_STRING portText;
RtlInitUnicodeString(&portText, NULL);
StrAppendStr0(&status, &portText, L"com0com - serial port emulator");
if (NT_SUCCESS(status))
pIrp->IoStatus.Information = (ULONG_PTR)portText.Buffer;
}
break;
case DeviceTextLocationInformation:
if (!pIrp->IoStatus.Information) {
UNICODE_STRING portText;
RtlInitUnicodeString(&portText, NULL);
StrAppendStr0(&status, &portText, pDevExt->portName);
if (NT_SUCCESS(status))
pIrp->IoStatus.Information = (ULONG_PTR)portText.Buffer;
}
break;
default:
status = pIrp->IoStatus.Status;
}
return status;
}
NTSTATUS FdoPortOpen(IN PC0C_FDOPORT_EXTENSION pDevExt)
{
LIST_ENTRY queueToComplete;
PUCHAR pBase;
ULONG size;
KIRQL oldIrql;
PC0C_IO_PORT pIoPort;
if (InterlockedIncrement(&pDevExt->openCount) != 1) {
InterlockedDecrement(&pDevExt->openCount);
return STATUS_ACCESS_DENIED;
}
pIoPort = pDevExt->pIoPortLocal;
if (pIoPort->plugInMode && !pIoPort->pIoPortRemote->isOpen) {
InterlockedDecrement(&pDevExt->openCount);
return STATUS_ACCESS_DENIED;
}
if (pIoPort->exclusiveMode)
IoInvalidateDeviceRelations(pIoPort->pPhDevObj, BusRelations);
switch (MmQuerySystemSize()) {
case MmLargeSystem:
size = 4096;
pBase = (PUCHAR)C0C_ALLOCATE_POOL(NonPagedPool, size);
if (pBase)
break;
case MmMediumSystem:
size = 1024;
pBase = (PUCHAR)C0C_ALLOCATE_POOL(NonPagedPool, size);
if (pBase)
break;
case MmSmallSystem:
size = 128;
pBase = (PUCHAR)C0C_ALLOCATE_POOL(NonPagedPool, size);
if (pBase)
break;
default:
size = 0;
pBase = NULL;
}
InitializeListHead(&queueToComplete);
#if ENABLE_TRACING
if (pIoPort->amountInWriteQueue) {
NTSTATUS status;
UNICODE_STRING msg;
status = STATUS_SUCCESS;
RtlInitUnicodeString(&msg, NULL);
StrAppendStr0(&status, &msg, L"!!!WARNING!!! amountInWriteQueue = ");
StrAppendNum(&status, &msg, pIoPort->amountInWriteQueue, 10);
Trace0((PC0C_COMMON_EXTENSION)pDevExt, msg.Buffer);
StrFree(&msg);
}
#endif /* ENABLE_TRACING */
KeAcquireSpinLock(pIoPort->pIoLock, &oldIrql);
InitBuffer(&pIoPort->readBuf, pBase, size);
pIoPort->amountInWriteQueue = 0;
pIoPort->tryWrite = FALSE;
pIoPort->errors = 0;
pIoPort->waitMask = 0;
pIoPort->eventMask = 0;
RtlZeroMemory(&pIoPort->perfStats, sizeof(pIoPort->perfStats));
pIoPort->handFlow.XoffLimit = size >> 3;
pIoPort->handFlow.XonLimit = size >> 1;
pIoPort->pIoPortRemote->brokeIdleChars = 0;
SetHandFlow(pIoPort, NULL, &queueToComplete);
SetModemControl(pIoPort, C0C_MCR_OPEN, C0C_MCR_OPEN, &queueToComplete);
if (pIoPort->pIoPortRemote->pWriteDelay && pIoPort->pIoPortRemote->brokeCharsProbability > 0)
StartWriteDelayTimer(pIoPort->pIoPortRemote->pWriteDelay);
KeReleaseSpinLock(pIoPort->pIoLock, oldIrql);
pIoPort->isOpen = TRUE;
if (pIoPort->pIoPortRemote->plugInMode)
IoInvalidateDeviceRelations(pIoPort->pIoPortRemote->pPhDevObj, BusRelations);
FdoPortCompleteQueue(&queueToComplete);
return STATUS_SUCCESS;
}
