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Diffstat (limited to 'pyparallel/src/win32/giveio/GIVEIO.C')
| -rw-r--r-- | pyparallel/src/win32/giveio/GIVEIO.C | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/pyparallel/src/win32/giveio/GIVEIO.C b/pyparallel/src/win32/giveio/GIVEIO.C deleted file mode 100644 index f752a29..0000000 --- a/pyparallel/src/win32/giveio/GIVEIO.C +++ /dev/null @@ -1,168 +0,0 @@ -/********************************************************************* - -Author: Dale Roberts -Date: 8/30/95 -Program: GIVEIO.SYS -Compile: Use DDK BUILD facility - -Purpose: Give direct port I/O access to a user mode process. - -*********************************************************************/ -#include <ntddk.h> - -/* - * The name of our device driver. - */ -#define DEVICE_NAME_STRING L"giveio" - -/* - * This is the "structure" of the IOPM. It is just a simple - * character array of length 0x2000. - * - * This holds 8K * 8 bits -> 64K bits of the IOPM, which maps the - * entire 64K I/O space of the x86 processor. Any 0 bits will give - * access to the corresponding port for user mode processes. Any 1 - * bits will disallow I/O access to the corresponding port. - */ -#define IOPM_SIZE 0x2000 -typedef UCHAR IOPM[IOPM_SIZE]; - -/* - * This will hold simply an array of 0's which will be copied - * into our actual IOPM in the TSS by Ke386SetIoAccessMap(). - * The memory is allocated at driver load time. - */ -IOPM *IOPM_local = 0; - -/* - * These are the two undocumented calls that we will use to give - * the calling process I/O access. - * - * Ke386IoSetAccessMap() copies the passed map to the TSS. - * - * Ke386IoSetAccessProcess() adjusts the IOPM offset pointer so that - * the newly copied map is actually used. Otherwise, the IOPM offset - * points beyond the end of the TSS segment limit, causing any I/O - * access by the user mode process to generate an exception. - */ -void Ke386SetIoAccessMap(int, IOPM *); -void Ke386QueryIoAccessMap(int, IOPM *); -void Ke386IoSetAccessProcess(PEPROCESS, int); - -/********************************************************************* - Release any allocated objects. -*********************************************************************/ -VOID GiveioUnload(IN PDRIVER_OBJECT DriverObject) -{ - WCHAR DOSNameBuffer[] = L"\\DosDevices\\" DEVICE_NAME_STRING; - UNICODE_STRING uniDOSString; - - if(IOPM_local) - MmFreeNonCachedMemory(IOPM_local, sizeof(IOPM)); - - RtlInitUnicodeString(&uniDOSString, DOSNameBuffer); - IoDeleteSymbolicLink (&uniDOSString); - IoDeleteDevice(DriverObject->DeviceObject); -} - -/********************************************************************* - Set the IOPM (I/O permission map) of the calling process so that it -is given full I/O access. Our IOPM_local[] array is all zeros, so -the IOPM will be all zeros. If OnFlag is 1, the process is given I/O -access. If it is 0, access is removed. -*********************************************************************/ -VOID SetIOPermissionMap(int OnFlag) -{ - Ke386IoSetAccessProcess(PsGetCurrentProcess(), OnFlag); - Ke386SetIoAccessMap(1, IOPM_local); -} - -void GiveIO(void) -{ - SetIOPermissionMap(1); -} - -/********************************************************************* - Service handler for a CreateFile() user mode call. - - This routine is entered in the driver object function call table by -the DriverEntry() routine. When the user mode application calls -CreateFile(), this routine gets called while still in the context of -the user mode application, but with the CPL (the processor's Current -Privelege Level) set to 0. This allows us to do kernel mode -operations. GiveIO() is called to give the calling process I/O -access. All the user mode application needs do to obtain I/O access -is open this device with CreateFile(). No other operations are -required. -*********************************************************************/ -NTSTATUS GiveioCreateDispatch( - IN PDEVICE_OBJECT DeviceObject, - IN PIRP Irp - ) -{ - GiveIO(); // give the calling process I/O access - - Irp->IoStatus.Information = 0; - Irp->IoStatus.Status = STATUS_SUCCESS; - IoCompleteRequest(Irp, IO_NO_INCREMENT); - return STATUS_SUCCESS; -} - -/********************************************************************* - Driver Entry routine. - - This routine is called only once after the driver is initially -loaded into memory. It allocates everything necessary for the -driver's operation. In our case, it allocates memory for our IOPM -array, and creates a device which user mode applications can open. -It also creates a symbolic link to the device driver. This allows -a user mode application to access our driver using the \\.\giveio -notation. -*********************************************************************/ -NTSTATUS DriverEntry( - IN PDRIVER_OBJECT DriverObject, - IN PUNICODE_STRING RegistryPath - ) -{ - PDEVICE_OBJECT deviceObject; - NTSTATUS status; - WCHAR NameBuffer[] = L"\\Device\\" DEVICE_NAME_STRING; - WCHAR DOSNameBuffer[] = L"\\DosDevices\\" DEVICE_NAME_STRING; - UNICODE_STRING uniNameString, uniDOSString; - - // - // Allocate a buffer for the local IOPM and zero it. - // - IOPM_local = MmAllocateNonCachedMemory(sizeof(IOPM)); - if(IOPM_local == 0) - return STATUS_INSUFFICIENT_RESOURCES; - RtlZeroMemory(IOPM_local, sizeof(IOPM)); - - // - // Set up device driver name and device object. - // - RtlInitUnicodeString(&uniNameString, NameBuffer); - RtlInitUnicodeString(&uniDOSString, DOSNameBuffer); - - status = IoCreateDevice(DriverObject, 0, - &uniNameString, - FILE_DEVICE_UNKNOWN, - 0, FALSE, &deviceObject); - - if(!NT_SUCCESS(status)) - return status; - - status = IoCreateSymbolicLink (&uniDOSString, &uniNameString); - - if (!NT_SUCCESS(status)) - return status; - - // - // Initialize the Driver Object with driver's entry points. - // All we require are the Create and Unload operations. - // - DriverObject->MajorFunction[IRP_MJ_CREATE] = GiveioCreateDispatch; - DriverObject->DriverUnload = GiveioUnload; - return STATUS_SUCCESS; -} - |