dlls/winedos/dosvm.c

   1 /*
   2  * DOS Virtual Machine
   3  *
   4  * Copyright 1998 Ove Kåven
   5  *
   6  * This code hasn't been completely cleaned up yet.
   7  */
   8
   9 #include "config.h"
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <errno.h>
  15 #include <fcntl.h>
  16 #include <signal.h>
  17 #include <unistd.h>
  18 #include <sys/time.h>
  19 #include <sys/types.h>
  20
  21 #include "wine/winbase16.h"
  22 #include "wine/exception.h"
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "wingdi.h"
  26 #include "winuser.h"
  27 #include "winnt.h"
  28 #include "wincon.h"
  29
  30 #include "msdos.h"
  31 #include "file.h"
  32 #include "miscemu.h"
  33 #include "dosexe.h"
  34 #include "../../loader/dos/dosmod.h"
  35 #include "stackframe.h"
  36 #include "debugtools.h"
  37
  38 DEFAULT_DEBUG_CHANNEL(int);
  39 DECLARE_DEBUG_CHANNEL(module);
  40 DECLARE_DEBUG_CHANNEL(relay);
  41
  42 WORD DOSVM_psp = 0;
  43 WORD DOSVM_retval = 0;
  44
  45 #ifdef MZ_SUPPORTED
  46
  47 #ifdef HAVE_SYS_VM86_H
  48 # include <sys/vm86.h>
  49 #endif
  50 #ifdef HAVE_SYS_MMAN_H
  51 # include <sys/mman.h>
  52 #endif
  53
  54 #define IF_CLR(ctx)     ((ctx)->EFlags &= ~VIF_MASK)
  55 #define IF_SET(ctx)     ((ctx)->EFlags |= VIF_MASK)
  56 #define IF_ENABLED(ctx) ((ctx)->EFlags & VIF_MASK)
  57 #define SET_PEND(ctx)   ((ctx)->EFlags |= VIP_MASK)
  58 #define CLR_PEND(ctx)   ((ctx)->EFlags &= ~VIP_MASK)
  59 #define IS_PEND(ctx)    ((ctx)->EFlags & VIP_MASK)
  60
  61 #undef TRY_PICRETURN
  62
  63 typedef struct _DOSEVENT {
  64   int irq,priority;
  65   DOSRELAY relay;
  66   void *data;
  67   struct _DOSEVENT *next;
  68 } DOSEVENT, *LPDOSEVENT;
  69
  70 static struct _DOSEVENT *pending_event, *current_event;
  71 static int sig_sent, entered;
  72 static CONTEXT86 *current_context;
  73
  74 /* from module.c */
  75 extern int read_pipe, write_pipe;
  76 extern HANDLE hReadPipe;
  77 extern pid_t dosmod_pid;
  78
  79 static void do_exception( int signal, CONTEXT86 *context )
  80 {
  81     EXCEPTION_RECORD rec;
  82     if ((signal == SIGTRAP) || (signal == SIGHUP))
  83     {
  84         rec.ExceptionCode  = EXCEPTION_BREAKPOINT;
  85         rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
  86     }
  87     else
  88     {
  89         rec.ExceptionCode  = EXCEPTION_ILLEGAL_INSTRUCTION;  /* generic error */
  90         rec.ExceptionFlags = EH_NONCONTINUABLE;
  91     }
  92     rec.ExceptionRecord  = NULL;
  93     rec.ExceptionAddress = (LPVOID)context->Eip;
  94     rec.NumberParameters = 0;
  95     EXC_RtlRaiseException( &rec, context );
  96 }
  97
  98 static void DOSVM_Dump( int fn, int sig, struct vm86plus_struct*VM86 )
  99 {
 100  BYTE*inst;
 101  int x;
 102
 103  switch (VM86_TYPE(fn)) {
 104   case VM86_SIGNAL:
 105    printf("Trapped signal %d\n",sig); break;
 106   case VM86_UNKNOWN:
 107    printf("Trapped unhandled GPF\n"); break;
 108   case VM86_INTx:
 109    printf("Trapped INT %02x\n",VM86_ARG(fn)); break;
 110   case VM86_STI:
 111    printf("Trapped STI\n"); break;
 112   case VM86_PICRETURN:
 113    printf("Trapped due to pending PIC request\n"); break;
 114   case VM86_TRAP:
 115    printf("Trapped debug request\n"); break;
 116   default:
 117    printf("Trapped unknown VM86 type %d arg %d\n",VM86_TYPE(fn),VM86_ARG(fn)); break;
 118  }
 119 #define REGS VM86->regs
 120  fprintf(stderr,"AX=%04lX CX=%04lX DX=%04lX BX=%04lX\n",REGS.eax,REGS.ecx,REGS.edx,REGS.ebx);
 121  fprintf(stderr,"SI=%04lX DI=%04lX SP=%04lX BP=%04lX\n",REGS.esi,REGS.edi,REGS.esp,REGS.ebp);
 122  fprintf(stderr,"CS=%04X DS=%04X ES=%04X SS=%04X\n",REGS.cs,REGS.ds,REGS.es,REGS.ss);
 123  fprintf(stderr,"IP=%04lX EFLAGS=%08lX\n",REGS.eip,REGS.eflags);
 124
 125  inst = PTR_REAL_TO_LIN( REGS.cs, REGS.eip );
 126 #undef REGS
 127  printf("Opcodes:");
 128  for (x=0; x<8; x++) printf(" %02x",inst[x]);
 129  printf("\n");
 130 }
 131
 132 static int DOSVM_SimulateInt( int vect, CONTEXT86 *context, BOOL inwine )
 133 {
 134   FARPROC16 handler=DOSVM_GetRMHandler(vect);
 135
 136   /* check for our real-mode hooks */
 137   if (vect==0x31) {
 138     if (context->SegCs==DOSMEM_wrap_seg) {
 139       /* exit from real-mode wrapper */
 140       return -1;
 141     }
 142     /* we could probably move some other dodgy stuff here too from dpmi.c */
 143   }
 144   /* check if the call is from our fake BIOS interrupt stubs */
 145   if ((context->SegCs==0xf000) && !inwine) {
 146     if (vect != (context->Eip/4)) {
 147       TRACE("something fishy going on here (interrupt stub is %02lx)\n", context->Eip/4);
 148     }
 149     TRACE("builtin interrupt %02x has been branched to\n", vect);
 150     DOSVM_RealModeInterrupt(vect, context);
 151   }
 152   /* check if the call goes to an unhooked interrupt */
 153   else if (SELECTOROF(handler)==0xf000) {
 154     /* if so, call it directly */
 155     TRACE("builtin interrupt %02x has been invoked (through vector %02x)\n", OFFSETOF(handler)/4, vect);
 156     DOSVM_RealModeInterrupt(OFFSETOF(handler)/4, context);
 157   }
 158   /* the interrupt is hooked, simulate interrupt in DOS space */
 159   else {
 160     WORD*stack= PTR_REAL_TO_LIN( context->SegSs, context->Esp );
 161     WORD flag=LOWORD(context->EFlags);
 162
 163     if (IF_ENABLED(context)) flag|=IF_MASK;
 164     else flag&=~IF_MASK;
 165
 166     *(--stack)=flag;
 167     *(--stack)=context->SegCs;
 168     *(--stack)=LOWORD(context->Eip);
 169     context->Esp-=6;
 170     context->SegCs=SELECTOROF(handler);
 171     context->Eip=OFFSETOF(handler);
 172     IF_CLR(context);
 173   }
 174   return 0;
 175 }
 176
 177 #define SHOULD_PEND(x) \
 178   (x && ((!current_event) || (x->priority < current_event->priority)))
 179
 180 static void DOSVM_SendQueuedEvent(CONTEXT86 *context)
 181 {
 182   LPDOSEVENT event = pending_event;
 183
 184   if (SHOULD_PEND(event)) {
 185     /* remove from "pending" list */
 186     pending_event = event->next;
 187     /* process event */
 188     if (event->irq>=0) {
 189       /* it's an IRQ, move it to "current" list */
 190       event->next = current_event;
 191       current_event = event;
 192       TRACE("dispatching IRQ %d\n",event->irq);
 193       /* note that if DOSVM_SimulateInt calls an internal interrupt directly,
 194        * current_event might be cleared (and event freed) in this very call! */
 195       DOSVM_SimulateInt((event->irq<8)?(event->irq+8):(event->irq-8+0x70),context,TRUE);
 196     } else {
 197       /* callback event */
 198       TRACE("dispatching callback event\n");
 199       (*event->relay)(context,event->data);
 200       free(event);
 201     }
 202   }
 203   if (!SHOULD_PEND(pending_event)) {
 204     TRACE("clearing Pending flag\n");
 205     CLR_PEND(context);
 206   }
 207 }
 208
 209 static void DOSVM_SendQueuedEvents(CONTEXT86 *context)
 210 {
 211   /* we will send all queued events as long as interrupts are enabled,
 212    * but IRQ events will disable interrupts again */
 213   while (IS_PEND(context) && IF_ENABLED(context))
 214     DOSVM_SendQueuedEvent(context);
 215 }
 216
 217 /***********************************************************************
 218  *              QueueEvent (WINEDOS.@)
 219  */
 220 void WINAPI DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
 221 {
 222   LPDOSEVENT event, cur, prev;
 223
 224   if (entered) {
 225     event = malloc(sizeof(DOSEVENT));
 226     if (!event) {
 227       ERR("out of memory allocating event entry\n");
 228       return;
 229     }
 230     event->irq = irq; event->priority = priority;
 231     event->relay = relay; event->data = data;
 232
 233     /* insert event into linked list, in order *after*
 234      * all earlier events of higher or equal priority */
 235     cur = pending_event; prev = NULL;
 236     while (cur && cur->priority<=priority) {
 237       prev = cur;
 238       cur = cur->next;
 239     }
 240     event->next = cur;
 241     if (prev) prev->next = event;
 242     else pending_event = event;
 243
 244     /* get dosmod's attention to the new event, if necessary */
 245     if (!sig_sent) {
 246       TRACE("new event queued, signalling dosmod\n");
 247       kill(dosmod_pid,SIGUSR2);
 248       sig_sent++;
 249     } else {
 250       TRACE("new event queued\n");
 251     }
 252   } else {
 253     /* DOS subsystem not running */
 254     /* (this probably means that we're running a win16 app
 255      *  which uses DPMI to thunk down to DOS services) */
 256     if (irq<0) {
 257       /* callback event, perform it with dummy context */
 258       CONTEXT86 context;
 259       memset(&context,0,sizeof(context));
 260       (*relay)(&context,data);
 261     } else {
 262       ERR("IRQ without DOS task: should not happen");
 263     }
 264   }
 265 }
 266
 267 #define CV do { CP(eax,Eax); CP(ecx,Ecx); CP(edx,Edx); CP(ebx,Ebx); \
 268            CP(esi,Esi); CP(edi,Edi); CP(esp,Esp); CP(ebp,Ebp); \
 269            CP(cs,SegCs); CP(ds,SegDs); CP(es,SegEs); \
 270            CP(ss,SegSs); CP(fs,SegFs); CP(gs,SegGs); \
 271            CP(eip,Eip); CP(eflags,EFlags); } while(0)
 272
 273 static int DOSVM_Process( int fn, int sig, struct vm86plus_struct*VM86 )
 274 {
 275  CONTEXT86 context, *old_context;
 276  int ret=0;
 277
 278 #define CP(x,y) context.y = VM86->regs.x
 279   CV;
 280 #undef CP
 281  if (VM86_TYPE(fn)==VM86_UNKNOWN) {
 282   ret=INSTR_EmulateInstruction(&context);
 283 #define CP(x,y) VM86->regs.x = context.y
 284   CV;
 285 #undef CP
 286   if (ret) return 0;
 287   ret=0;
 288  }
 289 #ifdef TRY_PICRETURN
 290  if (VM86->vm86plus.force_return_for_pic) {
 291    SET_PEND(&context);
 292  }
 293 #else
 294  /* linux doesn't preserve pending flag on return */
 295  if (SHOULD_PEND(pending_event)) {
 296    SET_PEND(&context);
 297  }
 298 #endif
 299
 300  old_context = current_context;
 301  current_context = &context;
 302
 303  switch (VM86_TYPE(fn)) {
 304   case VM86_SIGNAL:
 305    TRACE("DOS module caught signal %d\n",sig);
 306    if ((sig==SIGALRM) || (sig==SIGUSR2)) {
 307      if (sig==SIGALRM) {
 308        sig_sent++;
 309        DOSVM_QueueEvent(0,DOS_PRIORITY_REALTIME,NULL,NULL);
 310      }
 311      if (pending_event) {
 312        TRACE("setting Pending flag, interrupts are currently %s\n",
 313                  IF_ENABLED(&context) ? "enabled" : "disabled");
 314        SET_PEND(&context);
 315        DOSVM_SendQueuedEvents(&context);
 316      } else {
 317        TRACE("no events are pending, clearing Pending flag\n");
 318        CLR_PEND(&context);
 319      }
 320      sig_sent--;
 321    }
 322    else if ((sig==SIGHUP) || (sig==SIGILL) || (sig==SIGSEGV)) {
 323        do_exception( sig, &context );
 324    } else {
 325     DOSVM_Dump(fn,sig,VM86);
 326     ret=-1;
 327    }
 328    break;
 329   case VM86_UNKNOWN: /* unhandled GPF */
 330    DOSVM_Dump(fn,sig,VM86);
 331    do_exception( SIGSEGV, &context );
 332    break;
 333   case VM86_INTx:
 334    if (TRACE_ON(relay))
 335     DPRINTF("Call DOS int 0x%02x (EAX=%08lx) ret=%04lx:%04lx\n",VM86_ARG(fn),context.Eax,context.SegCs,context.Eip);
 336    ret=DOSVM_SimulateInt(VM86_ARG(fn),&context,FALSE);
 337    if (TRACE_ON(relay))
 338     DPRINTF("Ret  DOS int 0x%02x (EAX=%08lx) ret=%04lx:%04lx\n",VM86_ARG(fn),context.Eax,context.SegCs,context.Eip);
 339    break;
 340   case VM86_STI:
 341     IF_SET(&context);
 342   /* case VM86_PICRETURN: */
 343     TRACE("DOS task enabled interrupts %s events pending, sending events\n", IS_PEND(&context)?"with":"without");
 344     DOSVM_SendQueuedEvents(&context);
 345     break;
 346   case VM86_TRAP:
 347    do_exception( SIGTRAP, &context );
 348    break;
 349   default:
 350    DOSVM_Dump(fn,sig,VM86);
 351    ret=-1;
 352  }
 353
 354  current_context = old_context;
 355
 356 #define CP(x,y) VM86->regs.x = context.y
 357  CV;
 358 #undef CP
 359 #ifdef TRY_PICRETURN
 360  VM86->vm86plus.force_return_for_pic = IS_PEND(&context) ? 1 : 0;
 361  CLR_PEND(&context);
 362 #endif
 363  return ret;
 364 }
 365
 366 static void DOSVM_ProcessConsole(void)
 367 {
 368   INPUT_RECORD msg;
 369   DWORD res;
 370   BYTE scan;
 371
 372   if (ReadConsoleInputA(GetStdHandle(STD_INPUT_HANDLE),&msg,1,&res)) {
 373     switch (msg.EventType) {
 374     case KEY_EVENT:
 375       scan = msg.Event.KeyEvent.wVirtualScanCode;
 376       if (!msg.Event.KeyEvent.bKeyDown) scan |= 0x80;
 377
 378       /* check whether extended bit is set,
 379        * and if so, queue the extension prefix */
 380       if (msg.Event.KeyEvent.dwControlKeyState & ENHANCED_KEY) {
 381         DOSVM_Int09SendScan(0xE0,0);
 382       }
 383       DOSVM_Int09SendScan(scan,msg.Event.KeyEvent.uChar.AsciiChar);
 384       break;
 385     default:
 386       FIXME("unhandled console event: %d\n", msg.EventType);
 387     }
 388   }
 389 }
 390
 391 static void DOSVM_ProcessMessage(MSG *msg)
 392 {
 393   BYTE scan = 0;
 394
 395   TRACE("got message %04x, wparam=%08x, lparam=%08lx\n",msg->message,msg->wParam,msg->lParam);
 396   if ((msg->message>=WM_MOUSEFIRST)&&
 397       (msg->message<=WM_MOUSELAST)) {
 398     DOSVM_Int33Message(msg->message,msg->wParam,msg->lParam);
 399   } else {
 400     switch (msg->message) {
 401     case WM_KEYUP:
 402       scan = 0x80;
 403     case WM_KEYDOWN:
 404       scan |= (msg->lParam >> 16) & 0x7f;
 405
 406       /* check whether extended bit is set,
 407        * and if so, queue the extension prefix */
 408       if (msg->lParam & 0x1000000) {
 409         /* FIXME: some keys (function keys) have
 410          * extended bit set even when they shouldn't,
 411          * should check for them */
 412         DOSVM_Int09SendScan(0xE0,0);
 413       }
 414       DOSVM_Int09SendScan(scan,0);
 415       break;
 416     }
 417   }
 418 }
 419
 420 /***********************************************************************
 421  *              Wait (WINEDOS.@)
 422  */
 423 void WINAPI DOSVM_Wait( INT read_pipe, HANDLE hObject )
 424 {
 425   MSG msg;
 426   DWORD waitret;
 427   HANDLE objs[2];
 428   int objc;
 429   BOOL got_msg = FALSE;
 430
 431   objs[0]=GetStdHandle(STD_INPUT_HANDLE);
 432   objs[1]=hObject;
 433   objc=hObject?2:1;
 434   do {
 435     /* check for messages (waste time before the response check below) */
 436     if (PeekMessageA)
 437     {
 438         while (PeekMessageA(&msg,0,0,0,PM_REMOVE|PM_NOYIELD)) {
 439             /* got a message */
 440             DOSVM_ProcessMessage(&msg);
 441             /* we don't need a TranslateMessage here */
 442             DispatchMessageA(&msg);
 443             got_msg = TRUE;
 444         }
 445     }
 446 chk_console_input:
 447     if (!got_msg) {
 448       /* check for console input */
 449       INPUT_RECORD msg;
 450       DWORD num;
 451       if (PeekConsoleInputA(objs[0],&msg,1,&num) && num) {
 452         DOSVM_ProcessConsole();
 453         got_msg = TRUE;
 454       }
 455     }
 456     if (read_pipe == -1) {
 457       /* dispatch pending events */
 458       if (SHOULD_PEND(pending_event)) {
 459         CONTEXT86 context = *current_context;
 460         IF_SET(&context);
 461         SET_PEND(&context);
 462         DOSVM_SendQueuedEvents(&context);
 463       }
 464       if (got_msg) break;
 465     } else {
 466       fd_set readfds;
 467       struct timeval timeout={0,0};
 468       /* quick check for response from dosmod
 469        * (faster than doing the full blocking wait, if data already available) */
 470       FD_ZERO(&readfds); FD_SET(read_pipe,&readfds);
 471       if (select(read_pipe+1,&readfds,NULL,NULL,&timeout)>0)
 472         break;
 473     }
 474     /* nothing yet, block while waiting for something to do */
 475     if (MsgWaitForMultipleObjects)
 476         waitret = MsgWaitForMultipleObjects(objc,objs,FALSE,INFINITE,QS_ALLINPUT);
 477     else
 478         waitret = WaitForMultipleObjects(objc,objs,FALSE,INFINITE);
 479
 480     if (waitret==(DWORD)-1) {
 481       ERR_(module)("dosvm wait error=%ld\n",GetLastError());
 482     }
 483     if ((read_pipe != -1) && hObject) {
 484       if (waitret==(WAIT_OBJECT_0+1)) break;
 485     }
 486     if (waitret==WAIT_OBJECT_0)
 487       goto chk_console_input;
 488   } while (TRUE);
 489 }
 490
 491 /***********************************************************************
 492  *              Enter (WINEDOS.@)
 493  */
 494 INT WINAPI DOSVM_Enter( CONTEXT86 *context )
 495 {
 496  struct vm86plus_struct VM86;
 497  int stat,len,sig;
 498
 499  memset(&VM86, 0, sizeof(VM86));
 500 #define CP(x,y) VM86.regs.x = context->y
 501   CV;
 502 #undef CP
 503   if (VM86.regs.eflags & IF_MASK)
 504     VM86.regs.eflags |= VIF_MASK;
 505
 506  /* main exchange loop */
 507  entered++;
 508  do {
 509   TRACE_(module)("thread is: %lx\n",GetCurrentThreadId());
 510   stat = VM86_ENTER;
 511   errno = 0;
 512   /* transmit VM86 structure to dosmod task */
 513   if (write(write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
 514    ERR_(module)("dosmod sync lost, errno=%d, fd=%d, pid=%d\n",errno,write_pipe,getpid());
 515    return -1;
 516   }
 517   if (write(write_pipe,&VM86,sizeof(VM86))!=sizeof(VM86)) {
 518    ERR_(module)("dosmod sync lost, errno=%d\n",errno);
 519    return -1;
 520   }
 521   /* wait for response, doing other things in the meantime */
 522   DOSVM_Wait(read_pipe, hReadPipe);
 523   /* read response */
 524   while (1) {
 525     if ((len=read(read_pipe,&stat,sizeof(stat)))==sizeof(stat)) break;
 526     if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
 527      WARN_(module)("rereading dosmod return code due to errno=%d, result=%d\n",errno,len);
 528      continue;
 529     }
 530     ERR_(module)("dosmod sync lost reading return code, errno=%d, result=%d\n",errno,len);
 531     return -1;
 532   }
 533   TRACE_(module)("dosmod return code=%d\n",stat);
 534   if (stat==DOSMOD_LEFTIDLE) {
 535     continue;
 536   }
 537   while (1) {
 538     if ((len=read(read_pipe,&VM86,sizeof(VM86)))==sizeof(VM86)) break;
 539     if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
 540      WARN_(module)("rereading dosmod VM86 structure due to errno=%d, result=%d\n",errno,len);
 541      continue;
 542     }
 543     ERR_(module)("dosmod sync lost reading VM86 structure, errno=%d, result=%d\n",errno,len);
 544     return -1;
 545   }
 546   if ((stat&0xff)==DOSMOD_SIGNAL) {
 547     while (1) {
 548       if ((len=read(read_pipe,&sig,sizeof(sig)))==sizeof(sig)) break;
 549       if (((errno==EINTR)||(errno==EAGAIN))&&(len<=0)) {
 550         WARN_(module)("rereading dosmod signal due to errno=%d, result=%d\n",errno,len);
 551         continue;
 552       }
 553       ERR_(module)("dosmod sync lost reading signal, errno=%d, result=%d\n",errno,len);
 554       return -1;
 555     } while (0);
 556   } else sig=0;
 557   /* got response */
 558  } while (DOSVM_Process(stat,sig,&VM86)>=0);
 559  entered--;
 560
 561 #define CP(x,y) context->y = VM86.regs.x
 562   CV;
 563 #undef CP
 564  return 0;
 565 }
 566
 567 /***********************************************************************
 568  *              OutPIC (WINEDOS.@)
 569  */
 570 void WINAPI DOSVM_PIC_ioport_out( WORD port, BYTE val)
 571 {
 572     LPDOSEVENT event;
 573
 574     if ((port==0x20) && (val==0x20)) {
 575       if (current_event) {
 576         /* EOI (End Of Interrupt) */
 577         TRACE("received EOI for current IRQ, clearing\n");
 578         event = current_event;
 579         current_event = event->next;
 580         if (event->relay)
 581         (*event->relay)(NULL,event->data);
 582         free(event);
 583
 584         if (pending_event &&
 585             !sig_sent) {
 586           /* another event is pending, which we should probably
 587            * be able to process now, so tell dosmod about it */
 588           TRACE("another event pending, signalling dosmod\n");
 589           kill(dosmod_pid,SIGUSR2);
 590           sig_sent++;
 591         }
 592       } else {
 593         WARN("EOI without active IRQ\n");
 594       }
 595     } else {
 596       FIXME("unrecognized PIC command %02x\n",val);
 597     }
 598 }
 599
 600 /***********************************************************************
 601  *              SetTimer (WINEDOS.@)
 602  */
 603 void WINAPI DOSVM_SetTimer( UINT ticks )
 604 {
 605   int stat=DOSMOD_SET_TIMER;
 606   struct timeval tim;
 607
 608   if (write_pipe != -1) {
 609     /* the PC clocks ticks at 1193180 Hz */
 610     tim.tv_sec=0;
 611     tim.tv_usec=MulDiv(ticks,1000000,1193180);
 612     /* sanity check */
 613     if (!tim.tv_usec) tim.tv_usec=1;
 614
 615     if (write(write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
 616       ERR_(module)("dosmod sync lost, errno=%d\n",errno);
 617       return;
 618     }
 619     if (write(write_pipe,&tim,sizeof(tim))!=sizeof(tim)) {
 620       ERR_(module)("dosmod sync lost, errno=%d\n",errno);
 621       return;
 622     }
 623     /* there's no return */
 624   }
 625 }
 626
 627 /***********************************************************************
 628  *              GetTimer (WINEDOS.@)
 629  */
 630 UINT WINAPI DOSVM_GetTimer( void )
 631 {
 632   int stat=DOSMOD_GET_TIMER;
 633   struct timeval tim;
 634
 635   if (write_pipe != -1) {
 636     if (write(write_pipe,&stat,sizeof(stat))!=sizeof(stat)) {
 637       ERR_(module)("dosmod sync lost, errno=%d\n",errno);
 638       return 0;
 639     }
 640     /* read response */
 641     while (1) {
 642       if (read(read_pipe,&tim,sizeof(tim))==sizeof(tim)) break;
 643       if ((errno==EINTR)||(errno==EAGAIN)) continue;
 644       ERR_(module)("dosmod sync lost, errno=%d\n",errno);
 645       return 0;
 646     }
 647     return MulDiv(tim.tv_usec,1193180,1000000);
 648   }
 649   return 0;
 650 }
 651
 652 #else /* !MZ_SUPPORTED */
 653
 654 /***********************************************************************
 655  *              Enter (WINEDOS.@)
 656  */
 657 INT WINAPI DOSVM_Enter( CONTEXT86 *context )
 658 {
 659  ERR_(module)("DOS realmode not supported on this architecture!\n");
 660  return -1;
 661 }
 662
 663 /***********************************************************************
 664  *              Wait (WINEDOS.@)
 665  */
 666 void WINAPI DOSVM_Wait( INT read_pipe, HANDLE hObject) {}
 667
 668 /***********************************************************************
 669  *              OutPIC (WINEDOS.@)
 670  */
 671 void WINAPI DOSVM_PIC_ioport_out( WORD port, BYTE val) {}
 672
 673 /***********************************************************************
 674  *              SetTimer (WINEDOS.@)
 675  */
 676 void WINAPI DOSVM_SetTimer( UINT ticks ) {}
 677
 678 /***********************************************************************
 679  *              GetTimer (WINEDOS.@)
 680  */
 681 UINT WINAPI DOSVM_GetTimer( void ) { return 0; }
 682
 683 /***********************************************************************
 684  *              QueueEvent (WINEDOS.@)
 685  */
 686 void WINAPI DOSVM_QueueEvent( INT irq, INT priority, DOSRELAY relay, LPVOID data)
 687 {
 688   if (irq<0) {
 689     /* callback event, perform it with dummy context */
 690     CONTEXT86 context;
 691     memset(&context,0,sizeof(context));
 692     (*relay)(&context,data);
 693   } else {
 694     ERR("IRQ without DOS task: should not happen");
 695   }
 696 }
 697
 698 #endif
 699
 700 /**********************************************************************
 701  *          DOSVM_GetRMHandler
 702  *
 703  * Return the real mode interrupt vector for a given interrupt.
 704  */
 705 FARPROC16 DOSVM_GetRMHandler( BYTE intnum )
 706 {
 707     return ((FARPROC16*)DOSMEM_SystemBase())[intnum];
 708 }
 709
 710
 711 /**********************************************************************
 712  *          DOSVM_SetRMHandler
 713  *
 714  * Set the real mode interrupt handler for a given interrupt.
 715  */
 716 void DOSVM_SetRMHandler( BYTE intnum, FARPROC16 handler )
 717 {
 718     TRACE("Set real mode interrupt vector %02x <- %04x:%04x\n",
 719                  intnum, HIWORD(handler), LOWORD(handler) );
 720     ((FARPROC16*)DOSMEM_SystemBase())[intnum] = handler;
 721 }
 722
 723
 724 static const INTPROC real_mode_handlers[] =
 725 {
 726     /* 00 */ 0, 0, 0, 0, 0, 0, 0, 0,
 727     /* 08 */ 0, DOSVM_Int09Handler, 0, 0, 0, 0, 0, 0,
 728     /* 10 */ DOSVM_Int10Handler, INT_Int11Handler, INT_Int12Handler, INT_Int13Handler,
 729              0, INT_Int15Handler, DOSVM_Int16Handler, DOSVM_Int17Handler,
 730     /* 18 */ 0, 0, INT_Int1aHandler, 0, 0, 0, 0, 0,
 731     /* 20 */ DOSVM_Int20Handler, DOSVM_Int21Handler, 0, 0, 0, INT_Int25Handler, 0, 0,
 732     /* 28 */ 0, DOSVM_Int29Handler, INT_Int2aHandler, 0, 0, 0, 0, INT_Int2fHandler,
 733     /* 30 */ 0, DOSVM_Int31Handler, 0, DOSVM_Int33Handler
 734 };
 735
 736
 737 /**********************************************************************
 738  *          DOSVM_RealModeInterrupt
 739  *
 740  * Handle real mode interrupts
 741  */
 742 void DOSVM_RealModeInterrupt( BYTE intnum, CONTEXT86 *context )
 743 {
 744     if (intnum < sizeof(real_mode_handlers)/sizeof(INTPROC) && real_mode_handlers[intnum])
 745         (*real_mode_handlers[intnum])(context);
 746     else
 747     {
 748         FIXME("Unknown Interrupt in DOS mode: 0x%x\n", intnum);
 749         FIXME("    eax=%08lx ebx=%08lx ecx=%08lx edx=%08lx\n",
 750               context->Eax, context->Ebx, context->Ecx, context->Edx);
 751         FIXME("    esi=%08lx edi=%08lx ds=%04lx es=%04lx\n",
 752               context->Esi, context->Edi, context->SegDs, context->SegEs );
 753     }
 754 }
 755
 756
 757 /**********************************************************************
 758  *          DOSVM_Init
 759  */
 760 BOOL WINAPI DOSVM_Init( HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved )
 761 {
 762     TRACE_(module)("(0x%08x,%ld,%p)\n", hinstDLL, fdwReason, lpvReserved);
 763
 764     if (fdwReason == DLL_PROCESS_ATTACH)
 765     {
 766         /* initialize the memory */
 767         TRACE("Initializing DOS memory structures\n");
 768         DOSMEM_Init( TRUE );
 769         DOSDEV_InstallDOSDevices();
 770     }
 771     return TRUE;
 772 }