991 lines
21 KiB
C
991 lines
21 KiB
C
/*++
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Copyright (c) 1991, 1992, 1993 Microsoft Corporation
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Module Name:
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openclos.c
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Abstract:
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This module contains the code that is very specific to
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opening, closing, and cleaning up in the serial driver.
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Author:
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Anthony V. Ercolano 26-Sep-1991
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Environment:
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Kernel mode
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Revision History :
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--*/
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#include "precomp.h"
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BOOLEAN
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SerialMarkOpen(
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IN PVOID Context
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);
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BOOLEAN
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SerialCheckOpen(
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IN PVOID Context
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);
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BOOLEAN
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SerialNullSynch(
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IN PVOID Context
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);
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGESER,SerialGetCharTime)
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#pragma alloc_text(PAGESER,SerialMarkClose)
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#pragma alloc_text(PAGESER,SerialCleanup)
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#pragma alloc_text(PAGESER,SerialCreateOpen)
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#pragma alloc_text(PAGESER,SerialClose)
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#pragma alloc_text(PAGESER,SerialMarkClose)
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#pragma alloc_text(PAGESER,SerialMarkOpen)
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#pragma alloc_text(PAGESER,SerialCheckOpen)
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#pragma alloc_text(PAGESER,SerialNullSynch)
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#endif
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typedef struct _SERIAL_CHECK_OPEN {
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PSERIAL_DEVICE_EXTENSION Extension;
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NTSTATUS *StatusOfOpen;
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} SERIAL_CHECK_OPEN,*PSERIAL_CHECK_OPEN;
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//
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// Just a bogus little routine to make sure that we
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// can synch with the ISR.
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//
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BOOLEAN
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SerialNullSynch(
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IN PVOID Context
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) {
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UNREFERENCED_PARAMETER(Context);
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return FALSE;
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}
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NTSTATUS
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SerialCreateOpen(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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We connect up to the interrupt for the create/open and initialize
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the structures needed to maintain an open for a device.
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Arguments:
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DeviceObject - Pointer to the device object for this device
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Irp - Pointer to the IRP for the current request
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Return Value:
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The function value is the final status of the call
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--*/
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{
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PSERIAL_DEVICE_EXTENSION extension = DeviceObject->DeviceExtension;
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SERIAL_CHECK_OPEN checkOpen;
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NTSTATUS localStatus;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Dispatch entry for: %x\n",Irp)
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);
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SerialDump(
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SERDIAG3,
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("SERIAL: In SerialCreateOpen\n")
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);
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//
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// Before we do anything, let's make sure they aren't trying
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// to create a directory. This is a silly, but what's a driver to do!?
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//
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if (IoGetCurrentIrpStackLocation(Irp)->Parameters.Create.Options &
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FILE_DIRECTORY_FILE) {
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Irp->IoStatus.Status = STATUS_NOT_A_DIRECTORY;
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Irp->IoStatus.Information = 0;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Complete Irp: %x\n",Irp)
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);
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IoCompleteRequest(
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Irp,
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IO_NO_INCREMENT
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);
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return STATUS_NOT_A_DIRECTORY;
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}
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//
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// Create a buffer for the RX data when no reads are outstanding.
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//
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extension->InterruptReadBuffer = NULL;
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extension->BufferSize = 0;
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switch (MmQuerySystemSize()) {
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case MmLargeSystem: {
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extension->BufferSize = 4096;
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extension->InterruptReadBuffer = ExAllocatePool(
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NonPagedPool,
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extension->BufferSize
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);
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if (extension->InterruptReadBuffer) {
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break;
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}
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}
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case MmMediumSystem: {
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extension->BufferSize = 1024;
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extension->InterruptReadBuffer = ExAllocatePool(
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NonPagedPool,
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extension->BufferSize
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);
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if (extension->InterruptReadBuffer) {
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break;
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}
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}
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case MmSmallSystem: {
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extension->BufferSize = 128;
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extension->InterruptReadBuffer = ExAllocatePool(
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NonPagedPool,
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extension->BufferSize
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);
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}
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}
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if (!extension->InterruptReadBuffer) {
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extension->BufferSize = 0;
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Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
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Irp->IoStatus.Information = 0;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Complete Irp: %x\n",Irp)
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);
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IoCompleteRequest(
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Irp,
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IO_NO_INCREMENT
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);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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//
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// Ok, it looks like we really are going to open. Lock down the
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// driver.
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//
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extension->LockPtr = MmLockPagableCodeSection(SerialCreateOpen);
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//
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// On a new open we "flush" the read queue by initializing the
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// count of characters.
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//
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extension->CharsInInterruptBuffer = 0;
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extension->LastCharSlot = extension->InterruptReadBuffer +
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(extension->BufferSize - 1);
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extension->ReadBufferBase = extension->InterruptReadBuffer;
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extension->CurrentCharSlot = extension->InterruptReadBuffer;
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extension->FirstReadableChar = extension->InterruptReadBuffer;
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extension->TotalCharsQueued = 0;
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//
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// We set up the default xon/xoff limits.
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//
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extension->HandFlow.XoffLimit = extension->BufferSize >> 3;
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extension->HandFlow.XonLimit = extension->BufferSize >> 1;
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extension->BufferSizePt8 = ((3*(extension->BufferSize>>2))+
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(extension->BufferSize>>4));
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extension->IrpMaskLocation = NULL;
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extension->HistoryMask = 0;
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extension->IsrWaitMask = 0;
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extension->SendXonChar = FALSE;
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extension->SendXoffChar = FALSE;
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//
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// Clear out the statistics.
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//
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialClearStats,
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extension
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);
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//
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// The escape char replacement must be reset upon every open.
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//
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extension->EscapeChar = 0;
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if (!extension->PermitShare) {
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if (!extension->InterruptShareable) {
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checkOpen.Extension = extension;
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checkOpen.StatusOfOpen = &Irp->IoStatus.Status;
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialCheckOpen,
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&checkOpen
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);
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} else {
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialMarkOpen,
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extension
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);
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Irp->IoStatus.Status = STATUS_SUCCESS;
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}
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} else {
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//
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// Synchronize with the ISR and let it know that the device
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// has been successfully opened.
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//
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialMarkOpen,
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extension
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);
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Irp->IoStatus.Status = STATUS_SUCCESS;
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}
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localStatus = Irp->IoStatus.Status;
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Irp->IoStatus.Information=0L;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Complete Irp: %x\n",Irp)
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);
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IoCompleteRequest(
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Irp,
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IO_NO_INCREMENT
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);
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return localStatus;
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}
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NTSTATUS
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SerialClose(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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)
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/*++
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Routine Description:
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We simpley disconnect the interrupt for now.
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Arguments:
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DeviceObject - Pointer to the device object for this device
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Irp - Pointer to the IRP for the current request
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Return Value:
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The function value is the final status of the call
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--*/
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{
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//
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// This "timer value" is used to wait 10 character times
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// after the hardware is empty before we actually "run down"
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// all of the flow control/break junk.
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//
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LARGE_INTEGER tenCharDelay;
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//
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// Holds a character time.
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//
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LARGE_INTEGER charTime;
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//
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// Just what it says. This is the serial specific device
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// extension of the device object create for the serial driver.
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//
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PSERIAL_DEVICE_EXTENSION extension = DeviceObject->DeviceExtension;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Dispatch entry for: %x\n",Irp)
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);
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SerialDump(
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SERDIAG3,
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("SERIAL: In SerialClose\n")
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);
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charTime.QuadPart = -SerialGetCharTime(extension).QuadPart;
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//
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// Do this now so that if the isr gets called it won't do anything
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// to cause more chars to get sent. We want to run down the hardware.
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//
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extension->DeviceIsOpened = FALSE;
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//
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// Synchronize with the isr to turn off break if it
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// is already on.
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//
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialTurnOffBreak,
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extension
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);
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//
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// Wait until all characters have been emptied out of the hardware.
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//
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while ((READ_LINE_STATUS(extension->Controller) &
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(SERIAL_LSR_THRE | SERIAL_LSR_TEMT)) !=
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(SERIAL_LSR_THRE | SERIAL_LSR_TEMT)) {
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KeDelayExecutionThread(
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KernelMode,
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FALSE,
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&charTime
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);
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}
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//
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// Synchronize with the ISR to let it know that interrupts are
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// no longer important.
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//
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialMarkClose,
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extension
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);
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//
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// If the driver has automatically transmitted an Xoff in
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// the context of automatic receive flow control then we
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// should transmit an Xon.
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//
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if (extension->RXHolding & SERIAL_RX_XOFF) {
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//
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// Loop until the holding register is empty.
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//
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while (!(READ_LINE_STATUS(extension->Controller) &
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SERIAL_LSR_THRE)) {
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KeDelayExecutionThread(
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KernelMode,
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FALSE,
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&charTime
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);
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}
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WRITE_TRANSMIT_HOLDING(
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extension->Controller,
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extension->SpecialChars.XonChar
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);
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//
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// Wait until the character have been emptied out of the hardware.
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//
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while ((READ_LINE_STATUS(extension->Controller) &
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(SERIAL_LSR_THRE | SERIAL_LSR_TEMT)) !=
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(SERIAL_LSR_THRE | SERIAL_LSR_TEMT)) {
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KeDelayExecutionThread(
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KernelMode,
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FALSE,
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&charTime
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);
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}
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}
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//
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// The hardware is empty. Delay 10 character times before
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// shut down all the flow control.
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//
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tenCharDelay.QuadPart = charTime.QuadPart * 10;
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KeDelayExecutionThread(
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KernelMode,
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TRUE,
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&tenCharDelay
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);
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SerialClrDTR(extension);
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//
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// We have to be very careful how we clear the RTS line.
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// Transmit toggling might have been on at some point.
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//
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// We know that there is nothing left that could start
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// out the "polling" execution path. We need to
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// check the counter that indicates that the execution
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// path is active. If it is then we loop delaying one
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// character time. After each delay we check to see if
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// the counter has gone to zero. When it has we know that
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// the execution path should be just about finished. We
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// make sure that we still aren't in the routine that
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// synchronized execution with the ISR by synchronizing
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// ourselve with the ISR.
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//
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if (extension->CountOfTryingToLowerRTS) {
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do {
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KeDelayExecutionThread(
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KernelMode,
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FALSE,
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&charTime
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);
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} while (extension->CountOfTryingToLowerRTS);
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KeSynchronizeExecution(
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extension->Interrupt,
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SerialNullSynch,
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NULL
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);
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//
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// The execution path should no longer exist that
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// is trying to push down the RTS. Well just
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// make sure it's down by falling through to
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// code that forces it down.
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//
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}
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SerialClrRTS(extension);
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//
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// Clean out the holding reasons (since we are closed).
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//
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extension->RXHolding = 0;
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extension->TXHolding = 0;
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//
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// All is done. The port has been disabled from interrupting
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// so there is no point in keeping the memory around.
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//
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extension->BufferSize = 0;
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ExFreePool(extension->InterruptReadBuffer);
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extension->InterruptReadBuffer = NULL;
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information=0L;
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SerialDump(
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SERIRPPATH,
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("SERIAL: Complete Irp: %x\n",Irp)
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);
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IoCompleteRequest(
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Irp,
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IO_NO_INCREMENT
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);
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//
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// Unlock the pages. If this is the last reference to the section
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// then the driver code will be flushed out.
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//
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MmUnlockPagableImageSection(extension->LockPtr);
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return STATUS_SUCCESS;
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}
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|
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BOOLEAN
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SerialCheckOpen(
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IN PVOID Context
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)
|
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|
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/*++
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|
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Routine Description:
|
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|
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This routine will traverse the circular doubly linked list
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of devices that are using the same interrupt object. It will look
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for other devices that are open. If it doesn't find any
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it will indicate that it is ok to open this device.
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If it finds another device open we have two cases:
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1) The device we are trying to open is on a multiport card.
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If the already open device is part of a multiport device
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this code will indicate it is ok to open. We do this on the
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theory that the multiport devices are daisy chained
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and the cards can correctly arbitrate the interrupt
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line. Note this assumption could be wrong. Somebody
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could put two non-daisychained multiports on the
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same interrupt. However, only a total clod would do
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such a thing, and in my opinion deserves everthing they
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get.
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2) The device we are trying to open is not on a multiport card.
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We indicate that it is not ok to open.
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Arguments:
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|
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Context - This is a structure that contains a pointer to the
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extension of the device we are trying to open, and
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a pointer to an NTSTATUS that will indicate whether
|
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the device was opened or not.
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Return Value:
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This routine always returns FALSE.
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--*/
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|
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{
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PSERIAL_DEVICE_EXTENSION extensionToOpen =
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((PSERIAL_CHECK_OPEN)Context)->Extension;
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NTSTATUS *status = ((PSERIAL_CHECK_OPEN)Context)->StatusOfOpen;
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PLIST_ENTRY firstEntry = &extensionToOpen->CommonInterruptObject;
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PLIST_ENTRY currentEntry = firstEntry;
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PSERIAL_DEVICE_EXTENSION currentExtension;
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do {
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currentExtension = CONTAINING_RECORD(
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currentEntry,
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SERIAL_DEVICE_EXTENSION,
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CommonInterruptObject
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);
|
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|
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if (currentExtension->DeviceIsOpened) {
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break;
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}
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currentEntry = currentExtension->CommonInterruptObject.Flink;
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|
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} while (currentEntry != firstEntry);
|
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|
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if (currentEntry == firstEntry) {
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|
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//
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// We searched the whole list and found no other opens
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// mark the status as successful and call the regular
|
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// opening routine.
|
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//
|
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|
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*status = STATUS_SUCCESS;
|
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SerialMarkOpen(extensionToOpen);
|
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|
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} else {
|
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|
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if (!extensionToOpen->PortOnAMultiportCard) {
|
||
|
||
*status = STATUS_SHARED_IRQ_BUSY;
|
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|
||
} else {
|
||
|
||
if (!currentExtension->PortOnAMultiportCard) {
|
||
|
||
*status = STATUS_SHARED_IRQ_BUSY;
|
||
|
||
} else {
|
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|
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*status = STATUS_SUCCESS;
|
||
SerialMarkOpen(extensionToOpen);
|
||
|
||
}
|
||
|
||
}
|
||
|
||
}
|
||
|
||
return FALSE;
|
||
|
||
}
|
||
|
||
BOOLEAN
|
||
SerialMarkOpen(
|
||
IN PVOID Context
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine merely sets a boolean to true to mark the fact that
|
||
somebody opened the device and its worthwhile to pay attention
|
||
to interrupts.
|
||
|
||
Arguments:
|
||
|
||
Context - Really a pointer to the device extension.
|
||
|
||
Return Value:
|
||
|
||
This routine always returns FALSE.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
PSERIAL_DEVICE_EXTENSION extension = Context;
|
||
|
||
SerialReset(extension);
|
||
|
||
//
|
||
// Prepare for the opening by re-enabling interrupts.
|
||
//
|
||
// We do this my modifying the OUT2 line in the modem control.
|
||
// In PC's this bit is "anded" with the interrupt line.
|
||
//
|
||
// For the Jensen, we will ALWAYS leave the line high. That's
|
||
// the way the hardware engineers want it.
|
||
//
|
||
|
||
WRITE_MODEM_CONTROL(
|
||
extension->Controller,
|
||
(UCHAR)(READ_MODEM_CONTROL(extension->Controller) | SERIAL_MCR_OUT2)
|
||
);
|
||
|
||
extension->DeviceIsOpened = TRUE;
|
||
extension->ErrorWord = 0;
|
||
|
||
return FALSE;
|
||
|
||
}
|
||
|
||
BOOLEAN
|
||
SerialMarkClose(
|
||
IN PVOID Context
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This routine merely sets a boolean to false to mark the fact that
|
||
somebody closed the device and it's no longer worthwhile to pay attention
|
||
to interrupts.
|
||
|
||
Arguments:
|
||
|
||
Context - Really a pointer to the device extension.
|
||
|
||
Return Value:
|
||
|
||
This routine always returns FALSE.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
PSERIAL_DEVICE_EXTENSION extension = Context;
|
||
|
||
//
|
||
// Prepare for the closing by stopping interrupts.
|
||
//
|
||
// We do this by adjusting the OUT2 line in the modem control.
|
||
// In PC's this bit is "anded" with the interrupt line.
|
||
//
|
||
// The line should stay high on the Jensen because that's the
|
||
// way the hardware engineers did it.
|
||
//
|
||
|
||
if (!extension->Jensen) {
|
||
|
||
WRITE_MODEM_CONTROL(
|
||
extension->Controller,
|
||
(UCHAR)(READ_MODEM_CONTROL(extension->Controller) & ~SERIAL_MCR_OUT2)
|
||
);
|
||
|
||
}
|
||
|
||
if (extension->FifoPresent) {
|
||
|
||
WRITE_FIFO_CONTROL(
|
||
extension->Controller,
|
||
(UCHAR)0
|
||
);
|
||
|
||
}
|
||
|
||
extension->DeviceIsOpened = FALSE;
|
||
|
||
return FALSE;
|
||
|
||
}
|
||
|
||
NTSTATUS
|
||
SerialCleanup(
|
||
IN PDEVICE_OBJECT DeviceObject,
|
||
IN PIRP Irp
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function is used to kill all longstanding IO operations.
|
||
|
||
Arguments:
|
||
|
||
DeviceObject - Pointer to the device object for this device
|
||
|
||
Irp - Pointer to the IRP for the current request
|
||
|
||
Return Value:
|
||
|
||
The function value is the final status of the call
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
PSERIAL_DEVICE_EXTENSION extension = DeviceObject->DeviceExtension;
|
||
KIRQL oldIrql;
|
||
|
||
SerialDump(
|
||
SERIRPPATH,
|
||
("SERIAL: Dispatch entry for: %x\n",Irp)
|
||
);
|
||
//
|
||
// First kill all the reads and writes.
|
||
//
|
||
|
||
SerialKillAllReadsOrWrites(
|
||
DeviceObject,
|
||
&extension->WriteQueue,
|
||
&extension->CurrentWriteIrp
|
||
);
|
||
|
||
SerialKillAllReadsOrWrites(
|
||
DeviceObject,
|
||
&extension->ReadQueue,
|
||
&extension->CurrentReadIrp
|
||
);
|
||
|
||
//
|
||
// Next get rid of purges.
|
||
//
|
||
|
||
SerialKillAllReadsOrWrites(
|
||
DeviceObject,
|
||
&extension->PurgeQueue,
|
||
&extension->CurrentPurgeIrp
|
||
);
|
||
|
||
//
|
||
// Get rid of any mask operations.
|
||
//
|
||
|
||
SerialKillAllReadsOrWrites(
|
||
DeviceObject,
|
||
&extension->MaskQueue,
|
||
&extension->CurrentMaskIrp
|
||
);
|
||
|
||
//
|
||
// Now get rid a pending wait mask irp.
|
||
//
|
||
|
||
IoAcquireCancelSpinLock(&oldIrql);
|
||
|
||
if (extension->CurrentWaitIrp) {
|
||
|
||
PDRIVER_CANCEL cancelRoutine;
|
||
|
||
cancelRoutine = extension->CurrentWaitIrp->CancelRoutine;
|
||
extension->CurrentWaitIrp->Cancel = TRUE;
|
||
|
||
if (cancelRoutine) {
|
||
|
||
extension->CurrentWaitIrp->CancelIrql = oldIrql;
|
||
extension->CurrentWaitIrp->CancelRoutine = NULL;
|
||
|
||
cancelRoutine(
|
||
DeviceObject,
|
||
extension->CurrentWaitIrp
|
||
);
|
||
|
||
}
|
||
|
||
} else {
|
||
|
||
IoReleaseCancelSpinLock(oldIrql);
|
||
|
||
}
|
||
|
||
Irp->IoStatus.Status = STATUS_SUCCESS;
|
||
Irp->IoStatus.Information=0L;
|
||
|
||
SerialDump(
|
||
SERIRPPATH,
|
||
("SERIAL: Complete Irp: %x\n",Irp)
|
||
);
|
||
IoCompleteRequest(
|
||
Irp,
|
||
IO_NO_INCREMENT
|
||
);
|
||
|
||
return STATUS_SUCCESS;
|
||
|
||
}
|
||
|
||
LARGE_INTEGER
|
||
SerialGetCharTime(
|
||
IN PSERIAL_DEVICE_EXTENSION Extension
|
||
)
|
||
|
||
/*++
|
||
|
||
Routine Description:
|
||
|
||
This function will return the number of 100 nanosecond intervals
|
||
there are in one character time (based on the present form
|
||
of flow control.
|
||
|
||
Arguments:
|
||
|
||
Extension - Just what it says.
|
||
|
||
Return Value:
|
||
|
||
100 nanosecond intervals in a character time.
|
||
|
||
--*/
|
||
|
||
{
|
||
|
||
ULONG dataSize;
|
||
ULONG paritySize;
|
||
ULONG stopSize;
|
||
ULONG charTime;
|
||
ULONG bitTime;
|
||
LARGE_INTEGER tmp;
|
||
|
||
|
||
if ((Extension->LineControl & SERIAL_DATA_MASK) == SERIAL_5_DATA) {
|
||
dataSize = 5;
|
||
} else if ((Extension->LineControl & SERIAL_DATA_MASK)
|
||
== SERIAL_6_DATA) {
|
||
dataSize = 6;
|
||
} else if ((Extension->LineControl & SERIAL_DATA_MASK)
|
||
== SERIAL_7_DATA) {
|
||
dataSize = 7;
|
||
} else if ((Extension->LineControl & SERIAL_DATA_MASK)
|
||
== SERIAL_8_DATA) {
|
||
dataSize = 8;
|
||
}
|
||
|
||
paritySize = 1;
|
||
if ((Extension->LineControl & SERIAL_PARITY_MASK)
|
||
== SERIAL_NONE_PARITY) {
|
||
|
||
paritySize = 0;
|
||
|
||
}
|
||
|
||
if (Extension->LineControl & SERIAL_2_STOP) {
|
||
|
||
//
|
||
// Even if it is 1.5, for sanities sake were going
|
||
// to say 2.
|
||
//
|
||
|
||
stopSize = 2;
|
||
|
||
} else {
|
||
|
||
stopSize = 1;
|
||
|
||
}
|
||
|
||
//
|
||
// First we calculate the number of 100 nanosecond intervals
|
||
// are in a single bit time (Approximately).
|
||
//
|
||
|
||
bitTime = (10000000+(Extension->CurrentBaud-1))/Extension->CurrentBaud;
|
||
charTime = bitTime + ((dataSize+paritySize+stopSize)*bitTime);
|
||
|
||
tmp.QuadPart = charTime;
|
||
return tmp;
|
||
|
||
}
|