408 lines
8.4 KiB
C
408 lines
8.4 KiB
C
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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dpmi32.c
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Abstract:
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This function contains common code such as the dpmi dispatcher,
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and handling for the initialization of the dos extender.
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Author:
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Dave Hastings (daveh) 24-Nov-1992
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Revision History:
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Neil Sandlin (neilsa) 31-Jul-1995 - Updates for the 486 emulator
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--*/
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#include "precomp.h"
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#pragma hdrstop
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#include "softpc.h"
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#include <intapi.h>
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//
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// DPMI dispatch table
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//
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VOID (*DpmiDispatchTable[MAX_DPMI_BOP_FUNC])(VOID) = {
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DpmiInitDosxRM, // 0
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DpmiInitDosx, // 1
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DpmiInitLDT, // 2
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DpmiGetFastBopEntry, // 3
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DpmiInitIDT, // 4
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DpmiInitExceptionHandlers, // 5
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DpmiInitApp, // 6
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DpmiTerminateApp, // 7
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DpmiDpmiInUse, // 8
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DpmiDpmiNoLongerInUse, // 9
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switch_to_protected_mode, // 10 (DPMISwitchToProtectedMode)
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switch_to_real_mode, // 11 (DPMISwitchToRealMode)
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DpmiSetAltRegs, // 12
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DpmiIntHandlerIret16, // 13
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DpmiIntHandlerIret32, // 14
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DpmiFaultHandlerIret16, // 15
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DpmiFaultHandlerIret32, // 16
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DpmiUnhandledExceptionHandler, // 17
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DpmiRMCallBackCall, // 18
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DpmiReflectIntrToPM, // 19
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DpmiReflectIntrToV86, // 20
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DpmiInitPmStackInfo, // 21
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DpmiVcdPmSvcCall32, // 22
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DpmiSetDescriptorEntry, // 23
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DpmiResetLDTUserBase, // 24
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DpmiXlatInt21Call, // 25
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DpmiInt31Entry, // 26
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DpmiInt31Call, // 27
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DpmiHungAppIretAndExit // 28
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};
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VOID
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DpmiDispatch(
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VOID
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)
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/*++
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Routine Description:
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This function dispatches to the appropriate subfunction
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Arguments:
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None
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Return Value:
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None.
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--*/
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{
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DECLARE_LocalVdmContext;
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ULONG Index;
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static USHORT NestLevel = 0;
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Index = *(PUCHAR)VdmMapFlat(getCS(), getIP(), getMODE());
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setIP((getIP() + 1)); // take care of subfn.
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DBGTRACE(VDMTR_TYPE_DPMI | DPMI_DISPATCH_ENTRY, NestLevel++, Index);
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if (Index >= MAX_DPMI_BOP_FUNC) {
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//BUGBUG IMHO, we should fatal exit here
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#if DBG
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DbgPrint("NtVdm: Invalid DPMI BOP %lx\n", Index);
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#endif
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return;
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}
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(*DpmiDispatchTable[Index])();
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DBGTRACE(VDMTR_TYPE_DPMI | DPMI_DISPATCH_EXIT, --NestLevel, Index);
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}
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VOID
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DpmiIllegalFunction(
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VOID
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)
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/*++
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Routine Description:
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This routine ignores any Dpmi bops that are not implemented on a
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particular platform. It is called through the DpmiDispatchTable
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by #define'ing individual entries to this function.
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See dpmidata.h and dpmidatr.h.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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DECLARE_LocalVdmContext;
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char szFormat[] = "NtVdm: Invalid DPMI BOP from CS:IP %4.4x:%4.4x (%s mode), could be i386 dosx.exe.\n";
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char szMsg[sizeof(szFormat)+64];
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wsprintf(
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szMsg,
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szFormat,
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(int)getCS(),
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(int)getIP(),
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(getMSW() & MSW_PE) ? "prot" : "real"
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);
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OutputDebugString(szMsg);
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}
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VOID
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DpmiInitDosxRM(
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VOID
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)
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/*++
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Routine Description:
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This routine handles the RM initialization bop for the dos extender.
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It get the addresses of the structures that the dos extender and
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32 bit code share.
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Arguments:
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None
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Return Value:
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None.
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--*/
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{
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DECLARE_LocalVdmContext;
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PDOSX_RM_INIT_INFO pdi;
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ASSERT(!(getMSW() & MSW_PE));
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pdi = (PDOSX_RM_INIT_INFO) VdmMapFlat(getDS(), getSI(), VDM_V86);
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DosxStackFrameSize = pdi->StackFrameSize;
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RmBopFe = pdi->RmBopFe;
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PmBopFe = pdi->PmBopFe;
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DosxStackSegment = pdi->StackSegment;
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DosxRmCodeSegment = pdi->RmCodeSegment;
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DosxRmCodeSelector = pdi->RmCodeSelector;
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DosxFaultHandlerIret = pdi->pFaultHandlerIret;
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DosxFaultHandlerIretd = pdi->pFaultHandlerIretd;
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DosxIntHandlerIret = pdi->pIntHandlerIret;
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DosxIntHandlerIretd = pdi->pIntHandlerIretd;
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DosxIret = pdi->pIret;
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DosxIretd = pdi->pIretd;
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DosxRMReflector = pdi->RMReflector;
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RMCallBackBopOffset = pdi->RMCallBackBopOffset;
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RMCallBackBopSeg = pdi->RMCallBackBopSeg;
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PMReflectorSeg = pdi->PMReflectorSeg;
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DosxRmSaveRestoreState= pdi->RmSaveRestoreState;
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DosxPmSaveRestoreState= pdi->PmSaveRestoreState;
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DosxRmRawModeSwitch = pdi->RmRawModeSwitch;
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DosxPmRawModeSwitch = pdi->PmRawModeSwitch;
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DosxVcdPmSvcCall = pdi->VcdPmSvcCall;
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DosxMsDosApi = pdi->MsDosApi;
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DosxXmsControl = pdi->XmsControl;
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DosxHungAppExit = pdi->HungAppExit;
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//
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// Load the temporary LDT info (updated in DpmiInitLDT())
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//
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Ldt = VdmMapFlat(pdi->InitialLDTSeg, 0, VDM_V86);
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LdtMaxSel = pdi->InitialLDTSize;
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#ifdef _X86_
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//
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// On x86 platforms, return the fast bop address
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//
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GetFastBopEntryAddress(&((PVDM_TIB)NtCurrentTeb()->Vdm)->VdmContext);
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#endif
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}
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VOID
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DpmiInitDosx(
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VOID
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)
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/*++
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Routine Description:
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This routine handles the PM initialization bop for the dos extender.
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It get the addresses of the structures that the dos extender and
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32 bit code share.
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Note: These values are initialized here since they are FLAT pointers,
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and are thus not easily computed at the time of InitDosxRM.
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Arguments:
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None
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Return Value:
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None.
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--*/
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{
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DECLARE_LocalVdmContext;
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PDOSX_INIT_INFO pdi;
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ASSERT((getMSW() & MSW_PE));
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pdi = (PDOSX_INIT_INFO) VdmMapFlat(getDS(), getSI(), VDM_PM);
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SmallXlatBuffer = Sim32GetVDMPointer(pdi->pSmallXlatBuffer, 4, TRUE);
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LargeXlatBuffer = Sim32GetVDMPointer(pdi->pLargeXlatBuffer, 4, TRUE);
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DosxDtaBuffer = Sim32GetVDMPointer(pdi->pDtaBuffer, 4, TRUE);
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DosxStackFramePointer = (PWORD16)((PULONG)Sim32GetVDMPointer(
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pdi->pStackFramePointer, 4, TRUE));
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}
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VOID
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DpmiInitApp(
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VOID
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)
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/*++
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Routine Description:
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This routine handles any necessary 32 bit initialization for extended
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applications.
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Arguments:
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None.
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Return Value:
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None.
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Notes:
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This function contains a number of 386 specific things.
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Since we are likely to expand the 32 bit portions of DPMI in the
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future, this makes more sense than duplicating the common portions
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another file.
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--*/
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{
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DECLARE_LocalVdmContext;
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PWORD16 Data;
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Data = (PWORD16) VdmMapFlat(getSS(), getSP(), VDM_PM);
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// Only 1 bit defined in dpmi
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CurrentAppFlags = getAX() & DPMI_32BIT;
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#ifdef _X86_
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((PVDM_TIB)NtCurrentTeb()->Vdm)->DpmiInfo.Flags = CurrentAppFlags;
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if (CurrentAppFlags & DPMI_32BIT) {
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*pNtVDMState |= VDM_32BIT_APP;
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}
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#endif
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DpmiInitRegisterSize();
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CurrentDta = Sim32GetVDMPointer(
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*(PDWORD16)(Data),
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1,
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TRUE
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);
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CurrentDosDta = (PUCHAR) NULL;
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CurrentDtaOffset = *Data;
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CurrentDtaSelector = *(Data + 1);
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CurrentPSPSelector = *(Data + 2);
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}
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VOID
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DpmiTerminateApp(
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VOID
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)
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/*++
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Routine Description:
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This routine handles any necessary 32 bit destruction for extended
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applications.
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Arguments:
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None.
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Return Value:
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None.
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Notes:
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--*/
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{
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DpmiFreeAppXmem();
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CurrentPSPSelector = 0; // indicate no running app
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}
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VOID
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DpmiEnableIntHooks(
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VOID
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)
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/*++
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Routine Description:
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This routine is called very early on in NTVDM initialization. It
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gives the dpmi code a chance to do some startup stuff before any
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client code has run.
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This is not called via bop.
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Arguments:
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None
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Return Value:
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None.
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--*/
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{
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#ifndef _X86_
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IntelBase = (ULONG) VdmMapFlat(0, 0, VDM_V86);
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VdmInstallHardwareIntHandler(DpmiHwIntHandler);
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VdmInstallSoftwareIntHandler(DpmiSwIntHandler);
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VdmInstallFaultHandler(DpmiFaultHandler);
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#endif // _X86_
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}
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#ifdef DBCS
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VOID
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DpmiSwitchToDosxStack(
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VOID
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)
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{
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DECLARE_LocalVdmContext;
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SWITCH_TO_DOSX_RMSTACK();
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}
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VOID
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DpmiSwitchFromDosxStack(
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VOID
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)
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{
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DECLARE_LocalVdmContext;
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SWITCH_FROM_DOSX_RMSTACK();
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}
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#endif
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