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mpv/vidix/dhahelperwin/dhahelper.c

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/******************************************************************************
* dhahelper.c: direct hardware access under Windows NT/2000/XP
* Copyright (c) 2004 Sascha Sommer <saschasommer@freenet.de>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
#include <ntddk.h>
#include "dhahelper.h"
#define OutputDebugString DbgPrint
#define IOPM_SIZE 0x2000
typedef char IOPM[IOPM_SIZE];
static IOPM *pIOPM = NULL;
typedef struct {
PMDL Mdl;
PVOID SystemVirtualAddress;
PVOID UserVirtualAddress;
ULONG PhysMemSizeInBytes;
}alloc_priv;
static alloc_priv* alloclist;
static unsigned int alloccount=0;
static NTSTATUS dhahelperdispatch(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp);
static void dhahelperunload(IN PDRIVER_OBJECT DriverObject);
static NTSTATUS UnmapPhysicalMemory(PVOID UserVirtualAddress);
static NTSTATUS MapPhysicalMemoryToLinearSpace(PVOID pPhysAddress,ULONG PhysMemSizeInBytes,PVOID *PhysMemLin);
void Ke386SetIoAccessMap(int, IOPM *);
void Ke386QueryIoAccessMap(int, IOPM *);
void Ke386IoSetAccessProcess(PEPROCESS, int);
//entry point
NTSTATUS DriverEntry (IN PDRIVER_OBJECT DriverObject,IN PUNICODE_STRING RegistryPath){
UNICODE_STRING DeviceNameUnicodeString;
UNICODE_STRING DeviceLinkUnicodeString;
NTSTATUS ntStatus;
PDEVICE_OBJECT DeviceObject = NULL;
OutputDebugString ("dhahelper: entering DriverEntry");
RtlInitUnicodeString (&DeviceNameUnicodeString, L"\\Device\\DHAHELPER");
// Create an EXCLUSIVE device object (only 1 thread at a time
// can make requests to this device).
ntStatus = IoCreateDevice(DriverObject,0,&DeviceNameUnicodeString,FILE_DEVICE_DHAHELPER,0,TRUE,&DeviceObject);
if (NT_SUCCESS(ntStatus)){
// Create dispatch points for device control, create, close.
DriverObject->MajorFunction[IRP_MJ_CREATE] =
DriverObject->MajorFunction[IRP_MJ_CLOSE] =
DriverObject->MajorFunction[IRP_MJ_DEVICE_CONTROL] = dhahelperdispatch;
DriverObject->DriverUnload = dhahelperunload;
// Create a symbolic link, e.g. a name that a Win32 app can specify
// to open the device.
RtlInitUnicodeString (&DeviceLinkUnicodeString, L"\\DosDevices\\DHAHELPER");
ntStatus = IoCreateSymbolicLink(&DeviceLinkUnicodeString,&DeviceNameUnicodeString);
if (!NT_SUCCESS(ntStatus)){
// Symbolic link creation failed- note this & then delete the
// device object (it's useless if a Win32 app can't get at it).
OutputDebugString ("dhahelper: IoCreateSymbolicLink failed");
IoDeleteDevice (DeviceObject);
}
}
else{
OutputDebugString ("dhahelper: IoCreateDevice failed");
}
OutputDebugString ("dhahelper: leaving DriverEntry");
return ntStatus;
}
// Process the IRPs sent to this device
static NTSTATUS dhahelperdispatch(IN PDEVICE_OBJECT DeviceObject,IN PIRP Irp){
PIO_STACK_LOCATION IrpStack;
ULONG dwInputBufferLength;
ULONG dwOutputBufferLength;
ULONG dwIoControlCode;
PVOID pvIOBuffer;
NTSTATUS ntStatus;
dhahelper_t dhahelper_priv;
OutputDebugString ("dhahelper: entering dhahelperdispatch");
// Init to default settings
Irp->IoStatus.Status = STATUS_SUCCESS;
Irp->IoStatus.Information = 0;
IrpStack = IoGetCurrentIrpStackLocation(Irp);
// Get the pointer to the input/output buffer and it's length
pvIOBuffer = Irp->AssociatedIrp.SystemBuffer;
dwInputBufferLength = IrpStack->Parameters.DeviceIoControl.InputBufferLength;
dwOutputBufferLength = IrpStack->Parameters.DeviceIoControl.OutputBufferLength;
switch (IrpStack->MajorFunction){
case IRP_MJ_CREATE:
OutputDebugString("dhahelper: IRP_MJ_CREATE");
break;
case IRP_MJ_CLOSE:
OutputDebugString("dhahelper: IRP_MJ_CLOSE");
break;
case IRP_MJ_DEVICE_CONTROL:
OutputDebugString("dhahelper: IRP_MJ_DEVICE_CONTROL");
dwIoControlCode = IrpStack->Parameters.DeviceIoControl.IoControlCode;
switch (dwIoControlCode){
case IOCTL_DHAHELPER_ENABLEDIRECTIO:
OutputDebugString("dhahelper: IOCTL_DHAHELPER_ENABLEDIRECTIO");
pIOPM = MmAllocateNonCachedMemory(sizeof(IOPM));
if (pIOPM){
RtlZeroMemory(pIOPM, sizeof(IOPM));
Ke386IoSetAccessProcess(PsGetCurrentProcess(), 1);
Ke386SetIoAccessMap(1, pIOPM);
}
else Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
break;
case IOCTL_DHAHELPER_DISABLEDIRECTIO:
OutputDebugString("dhahelper: IOCTL_DHAHELPER_DISABLEDIRECTIO");
if (pIOPM){
Ke386IoSetAccessProcess(PsGetCurrentProcess(), 0);
Ke386SetIoAccessMap(1, pIOPM);
MmFreeNonCachedMemory(pIOPM, sizeof(IOPM));
pIOPM = NULL;
}
break;
case IOCTL_DHAHELPER_MAPPHYSTOLIN:
OutputDebugString("dhahelper: IOCTL_DHAHELPER_MAPPHYSTOLIN");
if (dwInputBufferLength){
memcpy (&dhahelper_priv, pvIOBuffer, dwInputBufferLength);
ntStatus = MapPhysicalMemoryToLinearSpace(dhahelper_priv.base,dhahelper_priv.size,&dhahelper_priv.ptr);
if (NT_SUCCESS(ntStatus)){
memcpy (pvIOBuffer, &dhahelper_priv, dwInputBufferLength);
Irp->IoStatus.Information = dwInputBufferLength;
}
Irp->IoStatus.Status = ntStatus;
}
else Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
break;
case IOCTL_DHAHELPER_UNMAPPHYSADDR:
OutputDebugString("dhahelper: IOCTL_DHAHELPER_UNMAPPHYSADDR");
if (dwInputBufferLength){
memcpy (&dhahelper_priv, pvIOBuffer, dwInputBufferLength);
ntStatus = UnmapPhysicalMemory(dhahelper_priv.ptr);
Irp->IoStatus.Status = ntStatus;
}
else
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
break;
default:
OutputDebugString("dhahelper: unknown IRP_MJ_DEVICE_CONTROL");
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER;
break;
}
break;
}
// DON'T get cute and try to use the status field of the irp in the
// return status. That IRP IS GONE as soon as you call IoCompleteRequest.
ntStatus = Irp->IoStatus.Status;
IoCompleteRequest (Irp, IO_NO_INCREMENT);
// We never have pending operation so always return the status code.
OutputDebugString("dhahelper: leaving dhahelperdispatch");
return ntStatus;
}
// Delete the associated device and return
static void dhahelperunload(IN PDRIVER_OBJECT DriverObject){
UNICODE_STRING DeviceLinkUnicodeString;
NTSTATUS ntStatus=STATUS_SUCCESS;
OutputDebugString ("dhahelper: entering dhahelperunload");
OutputDebugString ("dhahelper: unmapping remaining memory");
while(alloccount && (ntStatus==STATUS_SUCCESS))ntStatus = UnmapPhysicalMemory(alloclist[alloccount-1].UserVirtualAddress);
RtlInitUnicodeString (&DeviceLinkUnicodeString, L"\\DosDevices\\DHAHELPER");
ntStatus = IoDeleteSymbolicLink (&DeviceLinkUnicodeString);
if (NT_SUCCESS(ntStatus)){
IoDeleteDevice (DriverObject->DeviceObject);
}
else {
OutputDebugString ("dhahelper: IoDeleteSymbolicLink failed");
}
OutputDebugString ("dhahelper: leaving dhahelperunload");
}
/************************* memory mapping functions ******************************/
//unlike the functions of other io helpers these functions allow to map adapter memory on windows xp
//even if it has alread been mapped by the original driver
//the technique used is described in
//http://support.microsoft.com/default.aspx?scid=kb;en-us;q189327
//furthermore it keeps a list of mapped areas to free them when the driver gets unloaded
//I'm not sure what the limitations of ZwMapViewOfSection are but mapping 128MB videoram (that is probably already mapped by the gfxcard driver)
//won't work so it is generally a good idea to map only the memory you really need
static NTSTATUS MapPhysicalMemoryToLinearSpace(PVOID pPhysAddress,ULONG PhysMemSizeInBytes,PVOID *PhysMemLin){
alloc_priv* alloclisttmp;
PMDL Mdl=NULL;
PVOID SystemVirtualAddress=NULL;
PVOID UserVirtualAddress=NULL;
PHYSICAL_ADDRESS pStartPhysAddress;
OutputDebugString ("dhahelper: entering MapPhysicalMemoryToLinearSpace");
pStartPhysAddress.QuadPart = (ULONGLONG)pPhysAddress;
__try {
SystemVirtualAddress=MmMapIoSpace(pStartPhysAddress,PhysMemSizeInBytes, /*MmWriteCombined*/MmNonCached);
if(!SystemVirtualAddress){
OutputDebugString("dhahelper: MmMapIoSpace failed");
return STATUS_INVALID_PARAMETER;
}
OutputDebugString("dhahelper: SystemVirtualAddress 0x%x",SystemVirtualAddress);
Mdl=IoAllocateMdl(SystemVirtualAddress, PhysMemSizeInBytes, FALSE, FALSE,NULL);
if(!Mdl){
OutputDebugString("dhahelper: IoAllocateMdl failed");
return STATUS_INSUFFICIENT_RESOURCES;
}
OutputDebugString("dhahelper: Mdl 0x%x",Mdl);
MmBuildMdlForNonPagedPool(Mdl);
UserVirtualAddress = (PVOID)(((ULONG)PAGE_ALIGN(MmMapLockedPages(Mdl,UserMode))) + MmGetMdlByteOffset(Mdl));
if(!UserVirtualAddress){
OutputDebugString("dhahelper: MmMapLockedPages failed");
return STATUS_INSUFFICIENT_RESOURCES;
}
OutputDebugString("dhahelper: UserVirtualAddress 0x%x",UserVirtualAddress);
}__except(EXCEPTION_EXECUTE_HANDLER){
NTSTATUS ntStatus;
ntStatus = GetExceptionCode();
OutputDebugString("dhahelper: MapPhysicalMemoryToLinearSpace failed due to exception 0x%0x\n", ntStatus);
return ntStatus;
}
OutputDebugString("dhahelper: adding data to internal allocation list");
alloclisttmp=MmAllocateNonCachedMemory((alloccount+1)*sizeof(alloc_priv));
if(!alloclisttmp){
OutputDebugString("dhahelper: not enough memory to create temporary allocation list");
MmUnmapLockedPages(UserVirtualAddress, Mdl);
IoFreeMdl(Mdl);
return STATUS_INSUFFICIENT_RESOURCES;
}
if(alloccount){
memcpy(alloclisttmp,alloclist,alloccount * sizeof(alloc_priv));
MmFreeNonCachedMemory(alloclist,alloccount*sizeof(alloc_priv));
}
alloclist=alloclisttmp;
alloclist[alloccount].Mdl=Mdl;
alloclist[alloccount].SystemVirtualAddress=SystemVirtualAddress;
alloclist[alloccount].UserVirtualAddress=UserVirtualAddress;
alloclist[alloccount].PhysMemSizeInBytes=PhysMemSizeInBytes;
++alloccount;
*PhysMemLin=UserVirtualAddress;
OutputDebugString("dhahelper: leaving MapPhysicalMemoryToLinearSpace");
return STATUS_SUCCESS;
}
static NTSTATUS UnmapPhysicalMemory(PVOID UserVirtualAddress){
unsigned int i;
unsigned int x=0;
unsigned int alloccounttmp=alloccount;
OutputDebugString("dhahelper: entering UnmapPhysicalMemory to unmapp 0x%x",UserVirtualAddress);
if(!alloccount){
OutputDebugString("dhahelper: UnmapPhysicalMemory: nothing todo -> leaving...");
return STATUS_SUCCESS;
}
for(i=0;i<alloccount;i++){
if(alloclist[i].UserVirtualAddress!=UserVirtualAddress){
if(x!=i){
alloclist[x].Mdl=alloclist[i].Mdl;
alloclist[x].SystemVirtualAddress=alloclist[i].SystemVirtualAddress;
alloclist[x].UserVirtualAddress=alloclist[i].UserVirtualAddress;
alloclist[x].PhysMemSizeInBytes=alloclist[i].PhysMemSizeInBytes;
}
x++;
}
else if(alloclist[i].UserVirtualAddress==UserVirtualAddress){
if(x==i){
__try {
MmUnmapLockedPages(alloclist[x].UserVirtualAddress, alloclist[x].Mdl);
IoFreeMdl(alloclist[x].Mdl);
MmUnmapIoSpace(alloclist[x].SystemVirtualAddress,alloclist[x].PhysMemSizeInBytes);
}__except(EXCEPTION_EXECUTE_HANDLER){
NTSTATUS ntStatus;
ntStatus = GetExceptionCode();
OutputDebugString("dhahelper: UnmapPhysicalMemory failed due to exception 0x%0x (Mdl 0x%x)\n", ntStatus,alloclist[x].Mdl);
return ntStatus;
}
}
alloccounttmp--;
}
}
if(alloccounttmp){
alloc_priv* alloclisttmp;
alloclisttmp=MmAllocateNonCachedMemory(alloccounttmp*sizeof(alloc_priv));
if(!alloclisttmp){
OutputDebugString("dhahelper: not enough memory to create temporary allocation list");
return STATUS_INSUFFICIENT_RESOURCES;
}
memcpy(alloclisttmp,alloclist,alloccounttmp * sizeof(alloc_priv));
MmFreeNonCachedMemory(alloclist,alloccount*sizeof(alloc_priv));
alloclist=alloclisttmp;
}
alloccount=alloccounttmp;
OutputDebugString("dhahelper: leaving UnmapPhysicalMemory");
return STATUS_SUCCESS;
}
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