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/*++
Copyright (c) 1992 Microsoft Corporation
Module Name:
dpmi32.c
Abstract:
This function contains common code such as the dpmi dispatcher,
and handling for the initialization of the dos extender.
Author:
Dave Hastings (daveh) 24-Nov-1992
Revision History:
Neil Sandlin (neilsa) 31-Jul-1995 - Updates for the 486 emulator
--*/
#include "precomp.h"
#pragma hdrstop
#include "softpc.h"
//
// Information about the current PSP
//
USHORT CurrentPSPSelector;
//
// Table of selector bases and limits
//
ULONG FlatAddress[LDT_SIZE];
//
// Index # for DPMI bop. Used for error reporting on risc
//
ULONG Index;
//
// DPMI dispatch table
//
VOID (*DpmiDispatchTable[MAX_DPMI_BOP_FUNC])(VOID) = {
DpmiSetDescriptorEntry, // 0
switch_to_protected_mode, // 1
DpmiSetProtectedmodeInterrupt, // 2
DpmiGetFastBopEntry, // 3
DpmiInitDosx, // 4
DpmiInitApp, // 5
DpmiXlatInt21Call, // 6
DpmiAllocateXmem, // 7
DpmiFreeXmem, // 8
DpmiReallocateXmem, // 9
DpmiSetFaultHandler, // a
DpmiGetMemoryInfo, // b
DpmiDpmiInUse, // c
DpmiDpmiNoLongerInUse, // d
DpmiSetDebugRegisters, // e
DpmiPassTableAddress, // f
DpmiFreeAppXmem, // 10
DpmiPassPmStackInfo, // 11
DpmiVcdPmSvcCall32, // 12
DpmiFreeAllXmem, // 13
DpmiIntHandlerIret16, // 14
DpmiIntHandlerIret32, // 15
DpmiFaultHandlerIret16, // 16
DpmiFaultHandlerIret32, // 17
DpmiUnhandledExceptionHandler // 18
};
VOID
DpmiDispatch(
VOID
)
/*++
Routine Description:
This function dispatches to the appropriate subfunction
Arguments:
None
Return Value:
None.
--*/
{
Index = *(Sim32GetVDMPointer(
((getCS() << 16) | getIP()),
1,
(UCHAR) (getMSW() & MSW_PE)));
setIP((getIP() + 1)); // take care of subfn.
DBGTRACE(DPMI_DISPATCH_ENTRY, Index, 0, 0);
if (Index >= MAX_DPMI_BOP_FUNC) {
#if DBG
DbgPrint("NtVdm: Invalid DPMI BOP %lx\n", Index);
#endif
return;
}
(*DpmiDispatchTable[Index])();
}
VOID
DpmiIllegalFunction(
VOID
)
/*++
Routine Description:
This routine ignores any Dpmi bops that are not implemented on a
particular platform. It is called through the DpmiDispatchTable
by #define'ing individual entries to this function.
See dpmidata.h and dpmidatr.h.
Arguments:
None.
Return Value:
None.
--*/
{
char szFormat[] = "NtVdm: Invalid DPMI BOP 0x%x from CS:IP %4.4x:%4.4x (%s mode), could be i386 dosx.exe.\n";
char szMsg[sizeof(szFormat)+64];
wsprintf(
szMsg,
szFormat,
Index,
(int)getCS(),
(int)getIP(),
(getMSW() & MSW_PE) ? "prot" : "real"
);
OutputDebugString(szMsg);
}
VOID
DpmiInitDosx(
VOID
)
/*++
Routine Description:
This routine handle the initialization bop for the dos extender.
It get the addresses of the structures that the dos extender and
32 bit code share.
Arguments:
None
Return Value:
None.
--*/
{
PUCHAR SharedData;
ASSERT((getMSW() & MSW_PE));
SharedData = Sim32GetVDMPointer(((getDS() << 16) | getSI()), 2, TRUE);
DosxStackSegment = *((PWORD16)SharedData);
SmallXlatBuffer = Sim32GetVDMPointer(*((PDWORD16)(SharedData+2)), 4, TRUE);
LargeXlatBuffer = Sim32GetVDMPointer(*((PDWORD16)(SharedData+6)), 4, TRUE);
DosxStackFramePointer = (PWORD16)((PULONG)Sim32GetVDMPointer(
*((PDWORD16)(SharedData + 10)), 4, TRUE));
DosxStackFrameSize = *((PWORD16)(SharedData + 14));
RmBopFe = *((PDWORD16)(SharedData + 16));
DosxRmCodeSegment = *((PWORD16)(SharedData + 20));
DosxDtaBuffer = Sim32GetVDMPointer(*(PDWORD16)(SharedData+22), 4, TRUE);
DosxPmDataSelector = *(PWORD16)(SharedData + 26);
DosxRmCodeSelector = *(PWORD16)(SharedData + 28);
DosxSegmentToSelector = *(PDWORD16)(SharedData + 30);
DosxFaultHandlerIret = *(PDWORD16)(SharedData + 34);
DosxFaultHandlerIretd= *(PDWORD16)(SharedData + 38);
DosxIntHandlerIret = *(PDWORD16)(SharedData + 42);
DosxIntHandlerIretd = *(PDWORD16)(SharedData + 46);
DosxIret = *(PDWORD16)(SharedData + 50);
DosxIretd = *(PDWORD16)(SharedData + 54);
}
VOID
DpmiInitApp(
VOID
)
/*++
Routine Description:
This routine handles any necessary 32 bit initialization for extended
applications.
Arguments:
None.
Return Value:
None.
Notes:
This function contains a number of 386 specific things.
Since we are likely to expand the 32 bit portions of DPMI in the
future, this makes more sense than duplicating the common portions
another file.
--*/
{
PWORD16 Data;
Data = (PWORD16)Sim32GetVDMPointer(
((ULONG)getSS() << 16) | getSP(),
1,
TRUE
);
// Only 1 bit defined in dpmi
CurrentAppFlags = getAX() & DPMI_32BIT;
#if defined(i386)
VdmTib.PmStackInfo.Flags = CurrentAppFlags;
if (CurrentAppFlags & DPMI_32BIT) {
*pNtVDMState |= VDM_32BIT_APP;
}
#endif
DpmiInitRegisterSize();
CurrentDta = Sim32GetVDMPointer(
*(PDWORD16)(Data),
1,
TRUE
);
CurrentDosDta = (PUCHAR) NULL;
CurrentDtaOffset = *Data;
CurrentDtaSelector = *(Data + 1);
CurrentPSPSelector = *(Data + 2);
}
VOID DpmiPassTableAddress(
VOID
)
/*++
Routine Description:
This routine stores the flat address for the LDT table in the 16bit
land (pointed to by selGDT in 16bit land).
Arguments:
None
Return Value:
None.
--*/
{
Ldt = (PVOID)Sim32GetVDMPointer(
(getAX() << 16),
0,
(UCHAR) (getMSW() & MSW_PE)
);
IntelBase = (ULONG) Sim32GetVDMPointer((ULONG)0, 1, FALSE);
}
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