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https://github.com/reactos/reactos.git
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3bc2d590a1
We have a special file, tag.h, which serves as a place to store whatever kernel pool allocation tag yet we still have some tags sparse over the kernel code... So just re-group them in one unique place.
113 lines
3.1 KiB
C
113 lines
3.1 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/i386/psldt.c
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* PURPOSE: LDT support for x86
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* PROGRAMMERS: Stefan Ginsberg (stefan.ginsberg@reactos.org)
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*/
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/* INCLUDES ******************************************************************/
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#include <ntoskrnl.h>
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS *****************************************************************/
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VOID
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NTAPI
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PspDeleteLdt(PEPROCESS Process)
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{
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/* FIXME - LdtInformation must be null as long as we don't implement VDMs */
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ASSERT(Process->LdtInformation == NULL);
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}
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VOID
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NTAPI
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PspDeleteVdmObjects(PEPROCESS Process)
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{
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/* If there are no VDM objects, just exit */
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if (Process->VdmObjects == NULL)
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return;
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/* FIXME: Need to do more than just freeing the main VdmObjects member! */
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UNIMPLEMENTED;
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/* Free VDM objects */
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ExFreePoolWithTag(Process->VdmObjects, TAG_KERNEL);
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Process->VdmObjects = NULL;
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}
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NTSTATUS
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NTAPI
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PspQueryDescriptorThread(IN PETHREAD Thread,
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IN PVOID ThreadInformation,
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IN ULONG ThreadInformationLength,
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OUT PULONG ReturnLength OPTIONAL)
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{
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DESCRIPTOR_TABLE_ENTRY DescriptorEntry;
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LDT_ENTRY Descriptor;
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NTSTATUS Status;
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PAGED_CODE();
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/* Verify the size */
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if (ThreadInformationLength != sizeof(DESCRIPTOR_TABLE_ENTRY))
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{
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/* Fail */
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return STATUS_INFO_LENGTH_MISMATCH;
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}
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/* Enter SEH for the copy */
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_SEH2_TRY
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{
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/* Get the descriptor */
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RtlCopyMemory(&DescriptorEntry,
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ThreadInformation,
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sizeof(DESCRIPTOR_TABLE_ENTRY));
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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/* Return the exception code */
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_SEH2_YIELD(return _SEH2_GetExceptionCode());
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}
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_SEH2_END;
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/* Check if this is a GDT selector */
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if (!(DescriptorEntry.Selector & 0x4))
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{
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/* Get the GDT entry */
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Status = Ke386GetGdtEntryThread(&Thread->Tcb,
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DescriptorEntry.Selector & 0xFFFFFFF8,
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(PKGDTENTRY)&Descriptor);
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if (!NT_SUCCESS(Status)) return Status;
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/* Enter SEH for the copy */
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_SEH2_TRY
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{
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/* Copy the GDT entry to caller */
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RtlCopyMemory(&((PDESCRIPTOR_TABLE_ENTRY)ThreadInformation)->
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Descriptor,
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&Descriptor,
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sizeof(LDT_ENTRY));
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if (ReturnLength) *ReturnLength = sizeof(LDT_ENTRY);
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}
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_SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
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{
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/* Return the exception code */
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_SEH2_YIELD(return _SEH2_GetExceptionCode());
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}
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_SEH2_END;
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/* Success */
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Status = STATUS_SUCCESS;
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}
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else
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{
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/* This is only supported for VDM, which we don't implement */
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ASSERT(Thread->ThreadsProcess->LdtInformation == NULL);
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Status = STATUS_NO_LDT;
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}
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/* Return status to caller */
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return Status;
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}
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