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wine/dlls/krnl386.exe16/dosvm.c

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/*
* DOS Virtual Machine
*
* Copyright 1998 Ove Kåven
* Copyright 2002 Jukka Heinonen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Note: This code hasn't been completely cleaned up yet.
*/
#include "config.h"
#include "wine/port.h"
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include <sys/types.h>
#include "wine/winbase16.h"
#include "wine/exception.h"
#include "windef.h"
#include "winbase.h"
#include "winternl.h"
#include "wingdi.h"
#include "winuser.h"
#include "wownt32.h"
#include "winnt.h"
#include "wincon.h"
#include "dosexe.h"
#include "wine/debug.h"
#include "excpt.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
#ifdef MZ_SUPPORTED
WINE_DECLARE_DEBUG_CHANNEL(module);
WINE_DECLARE_DEBUG_CHANNEL(relay);
#endif
WORD DOSVM_psp = 0;
WORD DOSVM_retval = 0;
/*
* Wine DOS memory layout above 640k:
*
* a0000 - affff : VGA graphics (vga.c)
* b0000 - bffff : Monochrome text (unused)
* b8000 - bffff : VGA text (vga.c)
* c0000 - cffff : EMS frame (int67.c)
* d0000 - effff : Free memory for UMBs (himem.c)
* f0000 - fffff : BIOS stuff (msdos/dosmem.c)
* 100000 -10ffff : High memory area (unused)
*/
/*
* Table of real mode segments and protected mode selectors
* for code stubs and other miscellaneous storage.
*/
struct DPMI_segments *DOSVM_dpmi_segments = NULL;
/*
* First and last address available for upper memory blocks.
*/
#define DOSVM_UMB_BOTTOM 0xd0000
#define DOSVM_UMB_TOP 0xeffff
/*
* First free address for upper memory blocks.
*/
static DWORD DOSVM_umb_free = DOSVM_UMB_BOTTOM;
typedef struct _DOSEVENT {
int irq,priority;
DOSRELAY relay;
void *data;
struct _DOSEVENT *next;
} DOSEVENT, *LPDOSEVENT;
static struct _DOSEVENT *pending_event, *current_event;
static HANDLE event_notifier;
static CRITICAL_SECTION qcrit;
static CRITICAL_SECTION_DEBUG critsect_debug =
{
0, 0, &qcrit,
{ &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
0, 0, { (DWORD_PTR)(__FILE__ ": qcrit") }
};
static CRITICAL_SECTION qcrit = { &critsect_debug, -1, 0, 0, 0, 0 };
/***********************************************************************
* DOSVM_HasPendingEvents
*
* Return true if there are pending events that are not
* blocked by currently active event.
*/
static BOOL DOSVM_HasPendingEvents( void )
{
if (!pending_event)
return FALSE;
if (!current_event)
return TRUE;
if (pending_event->priority < current_event->priority)
return TRUE;
return FALSE;
}
/***********************************************************************
* DOSVM_SendOneEvent
*
* Process single pending event.
*
* This function should be called with queue critical section locked.
* The function temporarily releases the critical section if it is
* possible that internal interrupt handler or user procedure will
* be called. This is because we may otherwise get a deadlock if
* another thread is waiting for the same critical section.
*/
static void DOSVM_SendOneEvent( CONTEXT86 *context )
{
LPDOSEVENT event = pending_event;
/* Remove from pending events list. */
pending_event = event->next;
/* Process active event. */
if (event->irq >= 0)
{
BYTE intnum = (event->irq < 8) ?
(event->irq + 8) : (event->irq - 8 + 0x70);
/* Event is an IRQ, move it to current events list. */
event->next = current_event;
current_event = event;
TRACE( "Dispatching IRQ %d.\n", event->irq );
if (ISV86(context))
{
/*
* Note that if DOSVM_HardwareInterruptRM calls an internal
* interrupt directly, current_event might be cleared
* (and event freed) in this call.
*/
LeaveCriticalSection(&qcrit);
DOSVM_HardwareInterruptRM( context, intnum );
EnterCriticalSection(&qcrit);
}
else
{
/*
* This routine only modifies current context so it is
* not necessary to release critical section.
*/
DOSVM_HardwareInterruptPM( context, intnum );
}
}
else
{
/* Callback event. */
TRACE( "Dispatching callback event.\n" );
if (ISV86(context))
{
/*
* Call relay immediately in real mode.
*/
LeaveCriticalSection(&qcrit);
(*event->relay)( context, event->data );
EnterCriticalSection(&qcrit);
}
else
{
/*
* Force return to relay code. We do not want to
* call relay directly because we may be inside a signal handler.
*/
DOSVM_BuildCallFrame( context, event->relay, event->data );
}
HeapFree(GetProcessHeap(), 0, event);
}
}
/***********************************************************************
* DOSVM_SendQueuedEvents
*
* As long as context instruction pointer stays unmodified,
* process all pending events that are not blocked by currently
* active event.
*
* This routine assumes that caller has already cleared TEB.vm86_pending
* and checked that interrupts are enabled.
*/
void DOSVM_SendQueuedEvents( CONTEXT86 *context )
{
DWORD old_cs = context->SegCs;
DWORD old_ip = context->Eip;
EnterCriticalSection(&qcrit);
TRACE( "Called in %s mode %s events pending (time=%d)\n",
ISV86(context) ? "real" : "protected",
DOSVM_HasPendingEvents() ? "with" : "without",
GetTickCount() );
TRACE( "cs:ip=%04x:%08x, ss:sp=%04x:%08x\n",
context->SegCs, context->Eip, context->SegSs, context->Esp);
while (context->SegCs == old_cs &&
context->Eip == old_ip &&
DOSVM_HasPendingEvents())
{
DOSVM_SendOneEvent(context);
/*
* Event handling may have turned pending events flag on.
* We disable it here because this prevents some
* unnecessary calls to this function.
*/
get_vm86_teb_info()->vm86_pending = 0;
}
#ifdef MZ_SUPPORTED
if (DOSVM_HasPendingEvents())
{
/*
* Interrupts disabled, but there are still
* pending events, make sure that pending flag is turned on.
*/
TRACE( "Another event is pending, setting VIP flag.\n" );
get_vm86_teb_info()->vm86_pending |= VIP_MASK;
}
#else
FIXME("No DOS .exe file support on this platform (yet)\n");
#endif /* MZ_SUPPORTED */
LeaveCriticalSection(&qcrit);
}
#ifdef MZ_SUPPORTED
/***********************************************************************
* DOSVM_QueueEvent
*/
void DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
{
LPDOSEVENT event, cur, prev;
BOOL old_pending;
if (MZ_Current()) {
event = HeapAlloc(GetProcessHeap(), 0, sizeof(DOSEVENT));
if (!event) {
ERR("out of memory allocating event entry\n");
return;
}
event->irq = irq; event->priority = priority;
event->relay = relay; event->data = data;
EnterCriticalSection(&qcrit);
old_pending = DOSVM_HasPendingEvents();
/* insert event into linked list, in order *after*
* all earlier events of higher or equal priority */
cur = pending_event; prev = NULL;
while (cur && cur->priority<=priority) {
prev = cur;
cur = cur->next;
}
event->next = cur;
if (prev) prev->next = event;
else pending_event = event;
if (!old_pending && DOSVM_HasPendingEvents()) {
TRACE("new event queued, signalling (time=%d)\n", GetTickCount());
/* Alert VM86 thread about the new event. */
kill(dosvm_pid,SIGUSR2);
/* Wake up DOSVM_Wait so that it can serve pending events. */
SetEvent(event_notifier);
} else {
TRACE("new event queued (time=%d)\n", GetTickCount());
}
LeaveCriticalSection(&qcrit);
} else {
/* DOS subsystem not running */
/* (this probably means that we're running a win16 app
* which uses DPMI to thunk down to DOS services) */
if (irq<0) {
/* callback event, perform it with dummy context */
CONTEXT86 context;
memset(&context,0,sizeof(context));
(*relay)(&context,data);
} else {
ERR("IRQ without DOS task: should not happen\n");
}
}
}
static void DOSVM_ProcessConsole(void)
{
INPUT_RECORD msg;
DWORD res;
BYTE scan, ascii;
if (ReadConsoleInputA(GetStdHandle(STD_INPUT_HANDLE),&msg,1,&res)) {
switch (msg.EventType) {
case KEY_EVENT:
scan = msg.Event.KeyEvent.wVirtualScanCode;
ascii = msg.Event.KeyEvent.uChar.AsciiChar;
TRACE("scan %02x, ascii %02x\n", scan, ascii);
/* set the "break" (release) flag if key released */
if (!msg.Event.KeyEvent.bKeyDown) scan |= 0x80;
/* check whether extended bit is set,
* and if so, queue the extension prefix */
if (msg.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY) {
DOSVM_Int09SendScan(0xE0,0);
}
DOSVM_Int09SendScan(scan, ascii);
break;
case MOUSE_EVENT:
DOSVM_Int33Console(&msg.Event.MouseEvent);
break;
case WINDOW_BUFFER_SIZE_EVENT:
FIXME("unhandled WINDOW_BUFFER_SIZE_EVENT.\n");
break;
case MENU_EVENT:
FIXME("unhandled MENU_EVENT.\n");
break;
case FOCUS_EVENT:
FIXME("unhandled FOCUS_EVENT.\n");
break;
default:
FIXME("unknown console event: %d\n", msg.EventType);
}
}
}
static void DOSVM_ProcessMessage(MSG *msg)
{
BYTE scan = 0;
TRACE("got message %04x, wparam=%08lx, lparam=%08lx\n",msg->message,msg->wParam,msg->lParam);
if ((msg->message>=WM_MOUSEFIRST)&&
(msg->message<=WM_MOUSELAST)) {
DOSVM_Int33Message(msg->message,msg->wParam,msg->lParam);
} else {
switch (msg->message) {
case WM_KEYUP:
scan = 0x80;
case WM_KEYDOWN:
scan |= (msg->lParam >> 16) & 0x7f;
/* check whether extended bit is set,
* and if so, queue the extension prefix */
if (msg->lParam & 0x1000000) {
/* FIXME: some keys (function keys) have
* extended bit set even when they shouldn't,
* should check for them */
DOSVM_Int09SendScan(0xE0,0);
}
DOSVM_Int09SendScan(scan,0);
break;
}
}
}
/***********************************************************************
* DOSVM_Wait
*
* Wait for asynchronous events. This routine temporarily enables
* interrupts and waits until some asynchronous event has been
* processed.
*/
void DOSVM_Wait( CONTEXT86 *waitctx )
{
if (DOSVM_HasPendingEvents())
{
CONTEXT86 context = *waitctx;
/*
* If DOSVM_Wait is called from protected mode we emulate
* interrupt reflection and convert context into real mode context.
* This is actually the correct thing to do as long as DOSVM_Wait
* is only called from those interrupt functions that DPMI reflects
* to real mode.
*
* FIXME: Need to think about where to place real mode stack.
* FIXME: If DOSVM_Wait calls are nested stack gets corrupted.
* Can this really happen?
*/
if (!ISV86(&context))
{
context.EFlags |= V86_FLAG;
context.SegSs = 0xffff;
context.Esp = 0;
}
context.EFlags |= VIF_MASK;
context.SegCs = 0;
context.Eip = 0;
DOSVM_SendQueuedEvents(&context);
if(context.SegCs || context.Eip)
DPMI_CallRMProc( &context, NULL, 0, TRUE );
}
else
{
HANDLE objs[2];
int objc = DOSVM_IsWin16() ? 2 : 1;
DWORD waitret;
objs[0] = event_notifier;
objs[1] = GetStdHandle(STD_INPUT_HANDLE);
waitret = MsgWaitForMultipleObjects( objc, objs, FALSE,
INFINITE, QS_ALLINPUT );
if (waitret == WAIT_OBJECT_0)
{
/*
* New pending event has been queued, we ignore it
* here because it will be processed on next call to
* DOSVM_Wait.
*/
}
else if (objc == 2 && waitret == WAIT_OBJECT_0 + 1)
{
DOSVM_ProcessConsole();
}
else if (waitret == WAIT_OBJECT_0 + objc)
{
MSG msg;
while (PeekMessageA(&msg,0,0,0,PM_REMOVE|PM_NOYIELD))
{
/* got a message */
DOSVM_ProcessMessage(&msg);
/* we don't need a TranslateMessage here */
DispatchMessageA(&msg);
}
}
else
{
ERR_(module)( "dosvm wait error=%d\n", GetLastError() );
}
}
}
DWORD DOSVM_Loop( HANDLE hThread )
{
HANDLE objs[2];
int count = 0;
MSG msg;
DWORD waitret;
objs[count++] = hThread;
if (GetConsoleMode( GetStdHandle(STD_INPUT_HANDLE), NULL ))
objs[count++] = GetStdHandle(STD_INPUT_HANDLE);
for(;;) {
TRACE_(int)("waiting for action\n");
waitret = MsgWaitForMultipleObjects(count, objs, FALSE, INFINITE, QS_ALLINPUT);
if (waitret == WAIT_OBJECT_0) {
DWORD rv;
if(!GetExitCodeThread(hThread, &rv)) {
ERR("Failed to get thread exit code!\n");
rv = 0;
}
return rv;
}
else if (waitret == WAIT_OBJECT_0 + count) {
while (PeekMessageA(&msg,0,0,0,PM_REMOVE)) {
if (msg.hwnd) {
/* it's a window message */
DOSVM_ProcessMessage(&msg);
DispatchMessageA(&msg);
} else {
/* it's a thread message */
switch (msg.message) {
case WM_QUIT:
/* stop this madness!! */
return 0;
case WM_USER:
/* run passed procedure in this thread */
/* (sort of like APC, but we signal the completion) */
{
DOS_SPC *spc = (DOS_SPC *)msg.lParam;
TRACE_(int)("calling %p with arg %08lx\n", spc->proc, spc->arg);
(spc->proc)(spc->arg);
TRACE_(int)("done, signalling event %lx\n", msg.wParam);
SetEvent( (HANDLE)msg.wParam );
}
break;
default:
DispatchMessageA(&msg);
}
}
}
}
else if (waitret == WAIT_OBJECT_0 + 1)
{
DOSVM_ProcessConsole();
}
else
{
ERR_(int)("MsgWaitForMultipleObjects returned unexpected value.\n");
return 0;
}
}
}
static LONG WINAPI exception_handler(EXCEPTION_POINTERS *eptr)
{
EXCEPTION_RECORD *rec = eptr->ExceptionRecord;
CONTEXT *context = eptr->ContextRecord;
int arg = rec->ExceptionInformation[0];
BOOL ret;
switch(rec->ExceptionCode) {
case EXCEPTION_VM86_INTx:
TRACE_(relay)("Call DOS int 0x%02x ret=%04x:%04x\n"
" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
" ebp=%08x esp=%08x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
arg, context->SegCs, context->Eip,
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi,
context->Ebp, context->Esp, context->SegDs, context->SegEs, context->SegFs, context->SegGs,
context->EFlags );
ret = DOSVM_EmulateInterruptRM( context, arg );
TRACE_(relay)("Ret DOS int 0x%02x ret=%04x:%04x\n"
" eax=%08x ebx=%08x ecx=%08x edx=%08x esi=%08x edi=%08x\n"
" ebp=%08x esp=%08x ds=%04x es=%04x fs=%04x gs=%04x flags=%08x\n",
arg, context->SegCs, context->Eip,
context->Eax, context->Ebx, context->Ecx, context->Edx, context->Esi, context->Edi,
context->Ebp, context->Esp, context->SegDs, context->SegEs,
context->SegFs, context->SegGs, context->EFlags );
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
case EXCEPTION_VM86_STI:
/* case EXCEPTION_VM86_PICRETURN: */
if (!ISV86(context))
ERR( "Protected mode STI caught by real mode handler!\n" );
DOSVM_SendQueuedEvents(context);
return EXCEPTION_CONTINUE_EXECUTION;
case EXCEPTION_SINGLE_STEP:
ret = DOSVM_EmulateInterruptRM( context, 1 );
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
case EXCEPTION_BREAKPOINT:
ret = DOSVM_EmulateInterruptRM( context, 3 );
return ret ? EXCEPTION_CONTINUE_EXECUTION : EXCEPTION_EXECUTE_HANDLER;
}
return EXCEPTION_CONTINUE_SEARCH;
}
INT DOSVM_Enter( CONTEXT86 *context )
{
INT ret = 0;
if (!ISV86(context))
ERR( "Called with protected mode context!\n" );
__TRY
{
if (!WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)context )) ret = -1;
TRACE_(module)( "ret %d err %u\n", ret, GetLastError() );
}
__EXCEPT(exception_handler)
{
TRACE_(module)( "leaving vm86 mode\n" );
}
__ENDTRY
return ret;
}
/***********************************************************************
* DOSVM_PIC_ioport_out
*/
void DOSVM_PIC_ioport_out( WORD port, BYTE val)
{
if (port != 0x20)
{
FIXME( "Unsupported PIC port %04x\n", port );
}
else if (val == 0x20 || (val >= 0x60 && val <= 0x67))
{
EnterCriticalSection(&qcrit);
if (!current_event)
{
WARN( "%s without active IRQ\n",
val == 0x20 ? "EOI" : "Specific EOI" );
}
else if (val != 0x20 && val - 0x60 != current_event->irq)
{
WARN( "Specific EOI but current IRQ %d is not %d\n",
current_event->irq, val - 0x60 );
}
else
{
LPDOSEVENT event = current_event;
TRACE( "Received %s for current IRQ %d, clearing event\n",
val == 0x20 ? "EOI" : "Specific EOI", event->irq );
current_event = event->next;
if (event->relay)
(*event->relay)(NULL,event->data);
HeapFree(GetProcessHeap(), 0, event);
if (DOSVM_HasPendingEvents())
{
TRACE( "Another event pending, setting pending flag\n" );
get_vm86_teb_info()->vm86_pending |= VIP_MASK;
}
}
LeaveCriticalSection(&qcrit);
}
else
{
FIXME( "Unrecognized PIC command %02x\n", val );
}
}
#else /* !MZ_SUPPORTED */
/***********************************************************************
* DOSVM_Enter
*/
INT DOSVM_Enter( CONTEXT86 *context )
{
SetLastError( ERROR_NOT_SUPPORTED );
return -1;
}
/***********************************************************************
* DOSVM_Wait
*/
void DOSVM_Wait( CONTEXT86 *waitctx ) { }
/***********************************************************************
* DOSVM_PIC_ioport_out
*/
void DOSVM_PIC_ioport_out( WORD port, BYTE val) {}
/***********************************************************************
* DOSVM_QueueEvent
*/
void DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
{
if (irq<0) {
/* callback event, perform it with dummy context */
CONTEXT86 context;
memset(&context,0,sizeof(context));
(*relay)(&context,data);
} else {
ERR("IRQ without DOS task: should not happen\n");
}
}
#endif /* MZ_SUPPORTED */
/**********************************************************************
* DOSVM_AcknowledgeIRQ
*
* This routine should be called by all internal IRQ handlers.
*/
void WINAPI DOSVM_AcknowledgeIRQ( CONTEXT86 *context )
{
/*
* Send EOI to PIC.
*/
DOSVM_PIC_ioport_out( 0x20, 0x20 );
/*
* Protected mode IRQ handlers are supposed
* to turn VIF flag on before they return.
*/
if (!ISV86(context))
get_vm86_teb_info()->dpmi_vif = 1;
}
/***********************************************************************
* DOSVM_AllocUMB
*
* Allocate upper memory block (UMB) from upper memory.
* Returned pointer is aligned to 16-byte (paragraph) boundary.
*
* This routine is only for allocating static storage for
* Wine internal uses. Allocated memory can be accessed from
* real mode, memory is taken from area already mapped and reserved
* by Wine and the allocation has very little memory and speed
* overhead. Use of this routine also preserves precious DOS
* conventional memory.
*/
static LPVOID DOSVM_AllocUMB( DWORD size )
{
LPVOID ptr = (LPVOID)DOSVM_umb_free;
size = ((size + 15) >> 4) << 4;
if(DOSVM_umb_free + size - 1 > DOSVM_UMB_TOP) {
ERR("Out of upper memory area.\n");
return 0;
}
DOSVM_umb_free += size;
return ptr;
}
/**********************************************************************
* alloc_selector
*
* Allocate a selector corresponding to a real mode address.
* size must be < 64k.
*/
static WORD alloc_selector( void *base, DWORD size, unsigned char flags )
{
WORD sel = wine_ldt_alloc_entries( 1 );
if (sel)
{
LDT_ENTRY entry;
wine_ldt_set_base( &entry, base );
wine_ldt_set_limit( &entry, size - 1 );
wine_ldt_set_flags( &entry, flags );
wine_ldt_set_entry( sel, &entry );
}
return sel;
}
/***********************************************************************
* DOSVM_AllocCodeUMB
*
* Allocate upper memory block for storing code stubs.
* Initializes real mode segment and 16-bit protected mode selector
* for the allocated code block.
*
* FIXME: should allocate a single PM selector for the whole UMB range.
*/
static LPVOID DOSVM_AllocCodeUMB( DWORD size, WORD *segment, WORD *selector )
{
LPVOID ptr = DOSVM_AllocUMB( size );
if (segment)
*segment = (DWORD)ptr >> 4;
if (selector)
*selector = alloc_selector( ptr, size, WINE_LDT_FLAGS_CODE );
return ptr;
}
/***********************************************************************
* DOSVM_AllocDataUMB
*
* Allocate upper memory block for storing data.
* Initializes real mode segment and 16-bit protected mode selector
* for the allocated data block.
*/
LPVOID DOSVM_AllocDataUMB( DWORD size, WORD *segment, WORD *selector )
{
LPVOID ptr = DOSVM_AllocUMB( size );
if (segment)
*segment = (DWORD)ptr >> 4;
if (selector)
*selector = alloc_selector( ptr, size, WINE_LDT_FLAGS_DATA );
return ptr;
}
/***********************************************************************
* DOSVM_InitSegments
*
* Initializes DOSVM_dpmi_segments. Allocates required memory and
* sets up segments and selectors for accessing the memory.
*/
void DOSVM_InitSegments(void)
{
LPSTR ptr;
int i;
static const char wrap_code[]={
0xCD,0x31, /* int $0x31 */
0xCB /* lret */
};
static const char enter_xms[]=
{
/* XMS hookable entry point */
0xEB,0x03, /* jmp entry */
0x90,0x90,0x90, /* nop;nop;nop */
/* entry: */
/* real entry point */
/* for simplicity, we'll just use the same hook as DPMI below */
0xCD,0x31, /* int $0x31 */
0xCB /* lret */
};
static const char enter_pm[]=
{
0x50, /* pushw %ax */
0x52, /* pushw %dx */
0x55, /* pushw %bp */
0x89,0xE5, /* movw %sp,%bp */
/* get return CS */
0x8B,0x56,0x08, /* movw 8(%bp),%dx */
/* just call int 31 here to get into protected mode... */
/* it'll check whether it was called from dpmi_seg... */
0xCD,0x31, /* int $0x31 */
/* we are now in the context of a 16-bit relay call */
/* need to fixup our stack;
* 16-bit relay return address will be lost,
* but we won't worry quite yet
*/
0x8E,0xD0, /* movw %ax,%ss */
0x66,0x0F,0xB7,0xE5, /* movzwl %bp,%esp */
/* set return CS */
0x89,0x56,0x08, /* movw %dx,8(%bp) */
0x5D, /* popw %bp */
0x5A, /* popw %dx */
0x58, /* popw %ax */
0xfb, /* sti, enable and check virtual interrupts */
0xCB /* lret */
};
static const char relay[]=
{
0xca, 0x04, 0x00, /* 16-bit far return and pop 4 bytes (relay void* arg) */
0xcd, 0x31, /* int 31 */
0xfb, 0x66, 0xcb /* sti and 32-bit far return */
};
/*
* Allocate pointer array.
*/
DOSVM_dpmi_segments = DOSVM_AllocUMB( sizeof(struct DPMI_segments) );
/*
* RM / offset 0: Exit from real mode.
* RM / offset 2: Points to lret opcode.
*/
ptr = DOSVM_AllocCodeUMB( sizeof(wrap_code),
&DOSVM_dpmi_segments->wrap_seg, 0 );
memcpy( ptr, wrap_code, sizeof(wrap_code) );
/*
* RM / offset 0: XMS driver entry.
*/
ptr = DOSVM_AllocCodeUMB( sizeof(enter_xms),
&DOSVM_dpmi_segments->xms_seg, 0 );
memcpy( ptr, enter_xms, sizeof(enter_xms) );
/*
* RM / offset 0: Switch to DPMI.
* PM / offset 8: DPMI raw mode switch.
*/
ptr = DOSVM_AllocCodeUMB( sizeof(enter_pm),
&DOSVM_dpmi_segments->dpmi_seg,
&DOSVM_dpmi_segments->dpmi_sel );
memcpy( ptr, enter_pm, sizeof(enter_pm) );
/*
* PM / offset N*6: Interrupt N in DPMI32.
*/
ptr = DOSVM_AllocCodeUMB( 6 * 256,
0, &DOSVM_dpmi_segments->int48_sel );
for(i=0; i<256; i++) {
/*
* Each 32-bit interrupt handler is 6 bytes:
* 0xCD,<i> = int <i> (nested 16-bit interrupt)
* 0x66,0xCA,0x04,0x00 = ret 4 (32-bit far return and pop 4 bytes / eflags)
*/
ptr[i * 6 + 0] = 0xCD;
ptr[i * 6 + 1] = i;
ptr[i * 6 + 2] = 0x66;
ptr[i * 6 + 3] = 0xCA;
ptr[i * 6 + 4] = 0x04;
ptr[i * 6 + 5] = 0x00;
}
/*
* PM / offset N*5: Interrupt N in 16-bit protected mode.
*/
ptr = DOSVM_AllocCodeUMB( 5 * 256,
0, &DOSVM_dpmi_segments->int16_sel );
for(i=0; i<256; i++) {
/*
* Each 16-bit interrupt handler is 5 bytes:
* 0xCD,<i> = int <i> (interrupt)
* 0xCA,0x02,0x00 = ret 2 (16-bit far return and pop 2 bytes / eflags)
*/
ptr[i * 5 + 0] = 0xCD;
ptr[i * 5 + 1] = i;
ptr[i * 5 + 2] = 0xCA;
ptr[i * 5 + 3] = 0x02;
ptr[i * 5 + 4] = 0x00;
}
/*
* PM / offset 0: Stub where __wine_call_from_16_regs returns.
* PM / offset 3: Stub which swaps back to 32-bit application code/stack.
* PM / offset 5: Stub which enables interrupts
*/
ptr = DOSVM_AllocCodeUMB( sizeof(relay),
0, &DOSVM_dpmi_segments->relay_code_sel);
memcpy( ptr, relay, sizeof(relay) );
/*
* Space for 16-bit stack used by relay code.
*/
ptr = DOSVM_AllocDataUMB( DOSVM_RELAY_DATA_SIZE,
0, &DOSVM_dpmi_segments->relay_data_sel);
memset( ptr, 0, DOSVM_RELAY_DATA_SIZE );
/*
* As we store code in UMB we should make sure it is executable
*/
VirtualProtect((void *)DOSVM_UMB_BOTTOM, DOSVM_UMB_TOP - DOSVM_UMB_BOTTOM, PAGE_EXECUTE_READWRITE, NULL);
event_notifier = CreateEventW(NULL, FALSE, FALSE, NULL);
}
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