mirror of
https://github.com/reactos/reactos.git
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126 lines
3.3 KiB
C
126 lines
3.3 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/vdm/vdmmain.c
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* PURPOSE: VDM Support Services
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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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#define NDEBUG
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#include <debug.h>
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/* GLOBALS *******************************************************************/
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static UCHAR OrigIVT[1024];
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static UCHAR OrigBDA[256];
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/* PRIVATE FUNCTIONS *********************************************************/
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VOID
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INIT_FUNCTION
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NtEarlyInitVdm(VOID)
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{
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PCHAR start = MmCreateHyperspaceMapping(0);
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memcpy(OrigIVT, start, 1024);
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memcpy(OrigBDA, start+0x400, 256);
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MmDeleteHyperspaceMapping(start);
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}
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VOID
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NTAPI
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Ki386VdmEnablePentiumExtentions(VOID)
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{
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DPRINT1("VME detected but not yet supported\n");
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}
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VOID
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NTAPI
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KeI386VdmInitialize(VOID)
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{
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NTSTATUS Status;
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OBJECT_ATTRIBUTES ObjectAttributes;
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HANDLE RegHandle;
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UNICODE_STRING Name;
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UCHAR KeyValueInfo[sizeof(KEY_VALUE_BASIC_INFORMATION) + 30];
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ULONG ReturnLength;
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/* Make sure that there is a WOW key */
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RtlInitUnicodeString(&Name,
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L"\\Registry\\Machine\\System\\CurrentControlSet\\"
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L"Control\\Wow");
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InitializeObjectAttributes(&ObjectAttributes,
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&Name,
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OBJ_CASE_INSENSITIVE,
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NULL,
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NULL);
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Status = ZwOpenKey(&RegHandle, KEY_READ, &ObjectAttributes);
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if (!NT_SUCCESS(Status)) return;
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/* Check if VME is enabled */
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RtlInitUnicodeString(&Name, L"DisableVme");
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Status = ZwQueryValueKey(RegHandle,
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&Name,
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KeyValueBasicInformation,
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&KeyValueInfo,
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sizeof(KeyValueInfo),
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&ReturnLength);
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if (!NT_SUCCESS(Status))
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{
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/* Not present, so check if the CPU supports VME */
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if (KeGetPcr()->Prcb->FeatureBits & KF_V86_VIS)
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{
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/* Enable them. FIXME: Use IPI */
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Ki386VdmEnablePentiumExtentions();
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KeI386VirtualIntExtensions = TRUE;
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}
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}
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/* Close the key */
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ZwClose(RegHandle);
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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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NTSTATUS
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NTAPI
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NtVdmControl(IN ULONG ControlCode,
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IN PVOID ControlData)
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{
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NTSTATUS Status;
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PAGED_CODE();
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/* Check which control code this is */
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switch (ControlCode)
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{
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/* VDM Execution start */
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case VdmStartExecution:
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/* Call the sub-function */
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Status = VdmpStartExecution();
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break;
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case VdmInitialize:
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/* Pretty much a hack, since a lot more needs to happen */
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memcpy(ControlData, OrigIVT, 1024);
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memcpy((PVOID)((ULONG_PTR)ControlData + 1024), OrigBDA, 256);
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Status = STATUS_SUCCESS;
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break;
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default:
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/* Unsupported */
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DPRINT1("Unknown VDM call: %lx\n", ControlCode);
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Status = STATUS_INVALID_PARAMETER;
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}
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/* Return the status */
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return Status;
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}
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