mirror of
https://github.com/reactos/reactos.git
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129 lines
4.1 KiB
C
129 lines
4.1 KiB
C
/*
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* PROJECT: ReactOS Kernel
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* LICENSE: GPL - See COPYING in the top level directory
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* FILE: ntoskrnl/ps/win32.c
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* PURPOSE: Process Manager: Win32K Initialization and Support
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* PROGRAMMERS: Alex Ionescu (alex.ionescu@reactos.org)
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*/
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/* INCLUDES ****************************************************************/
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#include <ntoskrnl.h>
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#include <winerror.h>
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#define NDEBUG
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#include <debug.h>
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/* GLOBALS ******************************************************************/
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PKWIN32_PROCESS_CALLOUT PspW32ProcessCallout = NULL;
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PKWIN32_THREAD_CALLOUT PspW32ThreadCallout = NULL;
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PGDI_BATCHFLUSH_ROUTINE KeGdiFlushUserBatch = NULL;
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extern PKWIN32_SESSION_CALLOUT ExpWindowStationObjectParse;
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extern PKWIN32_SESSION_CALLOUT ExpWindowStationObjectDelete;
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extern PKWIN32_SESSION_CALLOUT ExpWindowStationObjectOkToClose;
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extern PKWIN32_SESSION_CALLOUT ExpDesktopObjectOkToClose;
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extern PKWIN32_SESSION_CALLOUT ExpDesktopObjectDelete;
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extern PKWIN32_SESSION_CALLOUT ExpDesktopObjectOpen;
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extern PKWIN32_SESSION_CALLOUT ExpDesktopObjectClose;
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extern PKWIN32_POWEREVENT_CALLOUT PopEventCallout;
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/* PRIVATE FUNCTIONS *********************************************************/
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NTSTATUS
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NTAPI
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PsConvertToGuiThread(VOID)
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{
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ULONG_PTR NewStack;
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PVOID OldStack;
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PETHREAD Thread = PsGetCurrentThread();
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PEPROCESS Process = PsGetCurrentProcess();
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NTSTATUS Status;
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PAGED_CODE();
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/* Validate the previous mode */
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if (KeGetPreviousMode() == KernelMode) return STATUS_INVALID_PARAMETER;
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/* If no win32k, crashes later */
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ASSERT(PspW32ProcessCallout != NULL);
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/* Make sure win32k is here */
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if (!PspW32ProcessCallout) return STATUS_ACCESS_DENIED;
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/* Make sure it's not already win32 */
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if (Thread->Tcb.ServiceTable != KeServiceDescriptorTable)
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{
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/* We're already a win32 thread */
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return STATUS_ALREADY_WIN32;
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}
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/* Check if we don't already have a kernel-mode stack */
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if (!Thread->Tcb.LargeStack)
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{
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/* We don't create one */
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NewStack = (ULONG_PTR)MmCreateKernelStack(TRUE, 0);
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if (!NewStack)
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{
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/* Panic in user-mode */
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NtCurrentTeb()->LastErrorValue = ERROR_NOT_ENOUGH_MEMORY;
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return STATUS_NO_MEMORY;
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}
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/* We're about to switch stacks. Enter a guarded region */
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KeEnterGuardedRegion();
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/* Switch stacks */
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OldStack = KeSwitchKernelStack((PVOID)NewStack,
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(PVOID)(NewStack - KERNEL_STACK_SIZE));
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/* Leave the guarded region */
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KeLeaveGuardedRegion();
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/* Delete the old stack */
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MmDeleteKernelStack(OldStack, FALSE);
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}
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/* Always do the process callout! */
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Status = PspW32ProcessCallout(Process, TRUE);
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if (!NT_SUCCESS(Status)) return Status;
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/* Set the new service table */
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Thread->Tcb.ServiceTable = KeServiceDescriptorTableShadow;
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ASSERT(Thread->Tcb.Win32Thread == 0);
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/* Tell Win32k about our thread */
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Status = PspW32ThreadCallout(Thread, PsW32ThreadCalloutInitialize);
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if (!NT_SUCCESS(Status))
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{
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/* Revert our table */
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Thread->Tcb.ServiceTable = KeServiceDescriptorTable;
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}
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/* Return status */
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return Status;
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}
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/* PUBLIC FUNCTIONS **********************************************************/
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/*
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* @implemented
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*/
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VOID
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NTAPI
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PsEstablishWin32Callouts(IN PWIN32_CALLOUTS_FPNS CalloutData)
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{
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/* Setup the callback pointers */
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PspW32ProcessCallout = CalloutData->ProcessCallout;
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PspW32ThreadCallout = CalloutData->ThreadCallout;
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ExpWindowStationObjectParse = CalloutData->WindowStationParseProcedure;
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ExpWindowStationObjectDelete = CalloutData->WindowStationDeleteProcedure;
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ExpWindowStationObjectOkToClose = CalloutData->WindowStationOkToCloseProcedure;
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ExpDesktopObjectOkToClose = CalloutData->DesktopOkToCloseProcedure;
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ExpDesktopObjectDelete = CalloutData->DesktopDeleteProcedure;
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ExpDesktopObjectOpen = CalloutData->DesktopOpenProcedure;
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ExpDesktopObjectClose = CalloutData->DesktopCloseProcedure;
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PopEventCallout = CalloutData->PowerEventCallout;
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KeGdiFlushUserBatch = CalloutData->BatchFlushRoutine;
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}
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/* EOF */
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