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Correctness for const pointer casts.
[wine/multimedia.git] / dlls / winedos / int31.c
blob36f99994ae509d946fd55dd16724e35fc043bf57
1 /*
2 * DPMI 0.9 emulation
3 *
4 * Copyright 1995 Alexandre Julliard
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "config.h"
22 #include "wine/port.h"
23
24 #include <stdarg.h>
25
26 #include "windef.h"
27 #include "winbase.h"
28 #include "wine/winbase16.h"
29 #include "wownt32.h"
30 #include "dosexe.h"
31
32 #include "excpt.h"
33 #include "wine/debug.h"
34 #include "wine/exception.h"
35 #include "thread.h"
36
37 WINE_DEFAULT_DEBUG_CHANNEL(int31);
38
39 /* Structure for real-mode callbacks */
40 typedef struct
41 {
42 DWORD edi;
43 DWORD esi;
44 DWORD ebp;
45 DWORD reserved;
46 DWORD ebx;
47 DWORD edx;
48 DWORD ecx;
49 DWORD eax;
50 WORD fl;
51 WORD es;
52 WORD ds;
53 WORD fs;
54 WORD gs;
55 WORD ip;
56 WORD cs;
57 WORD sp;
58 WORD ss;
59 } REALMODECALL;
60
61 typedef struct tagRMCB {
62 DWORD address;
63 DWORD proc_ofs,proc_sel;
64 DWORD regs_ofs,regs_sel;
65 struct tagRMCB *next;
66 } RMCB;
67
68 static RMCB *FirstRMCB = NULL;
69 static WORD dpmi_flag;
70 static void* lastvalloced = NULL;
71 static BYTE DPMI_retval;
72
73 /**********************************************************************
74 * DOSVM_IsDos32
75 *
76 * Return TRUE if we are in 32-bit protected mode DOS process.
77 */
78 BOOL DOSVM_IsDos32(void)
79 {
80 return (dpmi_flag & 1) ? TRUE : FALSE;
81 }
82
83
84 /**********************************************************************
85 * alloc_pm_selector
86 *
87 * Allocate a 64k sized selector corresponding to a real mode segment.
88 */
89 static WORD alloc_pm_selector( WORD seg, unsigned char flags )
90 {
91 WORD sel = wine_ldt_alloc_entries( 1 );
92
93 if (sel)
94 {
95 LDT_ENTRY entry;
96 wine_ldt_set_base( &entry, (void *)(seg << 4) );
97 wine_ldt_set_limit( &entry, 0xffff );
98 wine_ldt_set_flags( &entry, flags );
99 wine_ldt_set_entry( sel, &entry );
100 }
101 return sel;
102 }
103
104
105 /**********************************************************************
106 * dpmi_exception_handler
107 *
108 * Handle EXCEPTION_VM86_STI exceptions generated
109 * when there are pending asynchronous events.
110 */
111 static WINE_EXCEPTION_FILTER(dpmi_exception_handler)
112 {
113 #ifdef __i386__
114 EXCEPTION_RECORD *rec = GetExceptionInformation()->ExceptionRecord;
115 CONTEXT *context = GetExceptionInformation()->ContextRecord;
116
117 if (rec->ExceptionCode == EXCEPTION_VM86_STI)
118 {
119 if (ISV86(context))
120 ERR( "Real mode STI caught by protected mode handler!\n" );
121 DOSVM_SendQueuedEvents(context);
122 return EXCEPTION_CONTINUE_EXECUTION;
123 }
124 else if (rec->ExceptionCode == EXCEPTION_VM86_INTx)
125 {
126 if (ISV86(context))
127 ERR( "Real mode INTx caught by protected mode handler!\n" );
128 DPMI_retval = (BYTE)rec->ExceptionInformation[0];
129 return EXCEPTION_EXECUTE_HANDLER;
130 }
131
132 #endif
133 return EXCEPTION_CONTINUE_SEARCH;
134 }
135
136
137 /**********************************************************************
138 * INT_GetRealModeContext
139 */
140 static void INT_GetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
141 {
142 context->Eax = call->eax;
143 context->Ebx = call->ebx;
144 context->Ecx = call->ecx;
145 context->Edx = call->edx;
146 context->Esi = call->esi;
147 context->Edi = call->edi;
148 context->Ebp = call->ebp;
149 context->EFlags = call->fl | V86_FLAG;
150 context->Eip = call->ip;
151 context->Esp = call->sp;
152 context->SegCs = call->cs;
153 context->SegDs = call->ds;
154 context->SegEs = call->es;
155 context->SegFs = call->fs;
156 context->SegGs = call->gs;
157 context->SegSs = call->ss;
158 }
159
160
161 /**********************************************************************
162 * INT_SetRealModeContext
163 */
164 static void INT_SetRealModeContext( REALMODECALL *call, CONTEXT86 *context )
165 {
166 call->eax = context->Eax;
167 call->ebx = context->Ebx;
168 call->ecx = context->Ecx;
169 call->edx = context->Edx;
170 call->esi = context->Esi;
171 call->edi = context->Edi;
172 call->ebp = context->Ebp;
173 call->fl = LOWORD(context->EFlags);
174 call->ip = LOWORD(context->Eip);
175 call->sp = LOWORD(context->Esp);
176 call->cs = context->SegCs;
177 call->ds = context->SegDs;
178 call->es = context->SegEs;
179 call->fs = context->SegFs;
180 call->gs = context->SegGs;
181 call->ss = context->SegSs;
182 }
183
184 /**********************************************************************
185 * DPMI_xalloc
186 * special virtualalloc, allocates lineary monoton growing memory.
187 * (the usual VirtualAlloc does not satisfy that restriction)
188 */
189 static LPVOID DPMI_xalloc( DWORD len )
190 {
191 LPVOID ret;
192 LPVOID oldlastv = lastvalloced;
193
194 if (lastvalloced)
195 {
196 int xflag = 0;
197
198 ret = NULL;
199 while (!ret)
200 {
201 ret = VirtualAlloc( lastvalloced, len,
202 MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE );
203 if (!ret)
204 lastvalloced = (char *) lastvalloced + 0x10000;
205
206 /* we failed to allocate one in the first round.
207 * try non-linear
208 */
209 if (!xflag && (lastvalloced<oldlastv))
210 {
211 /* wrapped */
212 FIXME( "failed to allocate linearly growing memory (%ld bytes), "
213 "using non-linear growing...\n", len );
214 xflag++;
215 }
216
217 /* if we even fail to allocate something in the next
218 * round, return NULL
219 */
220 if ((xflag==1) && (lastvalloced >= oldlastv))
221 xflag++;
222
223 if ((xflag==2) && (lastvalloced < oldlastv)) {
224 FIXME( "failed to allocate any memory of %ld bytes!\n", len );
225 return NULL;
226 }
227 }
228 }
229 else
230 {
231 ret = VirtualAlloc( NULL, len,
232 MEM_COMMIT|MEM_RESERVE, PAGE_EXECUTE_READWRITE );
233 }
234
235 lastvalloced = (LPVOID)(((DWORD)ret+len+0xffff)&~0xffff);
236 return ret;
237 }
238
239 /**********************************************************************
240 * DPMI_xfree
241 */
242 static void DPMI_xfree( LPVOID ptr )
243 {
244 VirtualFree( ptr, 0, MEM_RELEASE );
245 }
246
247 /**********************************************************************
248 * DPMI_xrealloc
249 *
250 * FIXME: perhaps we could grow this mapped area...
251 */
252 static LPVOID DPMI_xrealloc( LPVOID ptr, DWORD newsize )
253 {
254 MEMORY_BASIC_INFORMATION mbi;
255 LPVOID newptr;
256
257 newptr = DPMI_xalloc( newsize );
258 if (ptr)
259 {
260 if (!VirtualQuery(ptr,&mbi,sizeof(mbi)))
261 {
262 FIXME( "realloc of DPMI_xallocd region %p?\n", ptr );
263 return NULL;
264 }
265
266 if (mbi.State == MEM_FREE)
267 {
268 FIXME( "realloc of DPMI_xallocd region %p?\n", ptr );
269 return NULL;
270 }
271
272 /* We do not shrink allocated memory. most reallocs
273 * only do grows anyway
274 */
275 if (newsize <= mbi.RegionSize)
276 return ptr;
277
278 memcpy( newptr, ptr, mbi.RegionSize );
279 DPMI_xfree( ptr );
280 }
281
282 return newptr;
283 }
284
285
286 #ifdef __i386__
287
288 void DPMI_CallRMCB32(RMCB *rmcb, UINT16 ss, DWORD esp, UINT16*es, DWORD*edi)
289 #if 0 /* original code, which early gccs puke on */
290 {
291 int _clobber;
292 __asm__ __volatile__(
293 "pushl %%ebp\n"
294 "pushl %%ebx\n"
295 "pushl %%es\n"
296 "pushl %%ds\n"
297 "pushfl\n"
298 "mov %7,%%es\n"
299 "mov %5,%%ds\n"
300 ".byte 0x36, 0xff, 0x18\n" /* lcall *%ss:(%eax) */
301 "popl %%ds\n"
302 "mov %%es,%0\n"
303 "popl %%es\n"
304 "popl %%ebx\n"
305 "popl %%ebp\n"
306 : "=d" (*es), "=D" (*edi), "=S" (_clobber), "=a" (_clobber), "=c" (_clobber)
307 : "0" (ss), "2" (esp),
308 "4" (rmcb->regs_sel), "1" (rmcb->regs_ofs),
309 "3" (&rmcb->proc_ofs) );
310 }
311 #else /* code generated by a gcc new enough */
312 ;
313 __ASM_GLOBAL_FUNC(DPMI_CallRMCB32,
314 "pushl %ebp\n\t"
315 "movl %esp,%ebp\n\t"
316 "pushl %edi\n\t"
317 "pushl %esi\n\t"
318 "movl 0x8(%ebp),%eax\n\t"
319 "movl 0x10(%ebp),%esi\n\t"
320 "movl 0xc(%ebp),%edx\n\t"
321 "movl 0x10(%eax),%ecx\n\t"
322 "movl 0xc(%eax),%edi\n\t"
323 "addl $0x4,%eax\n\t"
324 "pushl %ebp\n\t"
325 "pushl %ebx\n\t"
326 "pushl %es\n\t"
327 "pushl %ds\n\t"
328 "pushfl\n\t"
329 "mov %cx,%es\n\t"
330 "mov %dx,%ds\n\t"
331 ".byte 0x36, 0xff, 0x18\n\t" /* lcall *%ss:(%eax) */
332 "popl %ds\n\t"
333 "mov %es,%dx\n\t"
334 "popl %es\n\t"
335 "popl %ebx\n\t"
336 "popl %ebp\n\t"
337 "movl 0x14(%ebp),%eax\n\t"
338 "movw %dx,(%eax)\n\t"
339 "movl 0x18(%ebp),%edx\n\t"
340 "movl %edi,(%edx)\n\t"
341 "popl %esi\n\t"
342 "popl %edi\n\t"
343 "leave\n\t"
344 "ret")
345 #endif
346
347 #endif /* __i386__ */
348
349 /**********************************************************************
350 * DPMI_CallRMCBProc
351 *
352 * This routine does the hard work of calling a callback procedure.
353 */
354 static void DPMI_CallRMCBProc( CONTEXT86 *context, RMCB *rmcb, WORD flag )
355 {
356 DWORD old_vif = NtCurrentTeb()->dpmi_vif;
357
358 /* Disable virtual interrupts. */
359 NtCurrentTeb()->dpmi_vif = 0;
360
361 if (wine_ldt_is_system( rmcb->proc_sel )) {
362 /* Wine-internal RMCB, call directly */
363 ((RMCBPROC)rmcb->proc_ofs)(context);
364 } else __TRY {
365 #ifdef __i386__
366 UINT16 ss,es;
367 DWORD esp,edi;
368
369 INT_SetRealModeContext(MapSL(MAKESEGPTR( rmcb->regs_sel, rmcb->regs_ofs )), context);
370 ss = alloc_pm_selector( context->SegSs, WINE_LDT_FLAGS_DATA );
371 esp = context->Esp;
372
373 FIXME("untested!\n");
374
375 /* The called proc ends with an IRET, and takes these parameters:
376 * DS:ESI = pointer to real-mode SS:SP
377 * ES:EDI = pointer to real-mode call structure
378 * It returns:
379 * ES:EDI = pointer to real-mode call structure (may be a copy)
380 * It is the proc's responsibility to change the return CS:IP in the
381 * real-mode call structure. */
382 if (flag & 1) {
383 /* 32-bit DPMI client */
384 DPMI_CallRMCB32(rmcb, ss, esp, &es, &edi);
385 } else {
386 /* 16-bit DPMI client */
387 CONTEXT86 ctx = *context;
388 ctx.SegCs = rmcb->proc_sel;
389 ctx.Eip = rmcb->proc_ofs;
390 ctx.SegDs = ss;
391 ctx.Esi = esp;
392 ctx.SegEs = rmcb->regs_sel;
393 ctx.Edi = rmcb->regs_ofs;
394 /* FIXME: I'm pretty sure this isn't right - should push flags first */
395 WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&ctx );
396 es = ctx.SegEs;
397 edi = ctx.Edi;
398 }
399 wine_ldt_free_entries( ss, 1 );
400 INT_GetRealModeContext( MapSL( MAKESEGPTR( es, edi )), context);
401 #else
402 ERR("RMCBs only implemented for i386\n");
403 #endif
404 } __EXCEPT(dpmi_exception_handler) { } __ENDTRY
405
406 /* Restore virtual interrupt flag. */
407 NtCurrentTeb()->dpmi_vif = old_vif;
408 }
409
410
411 /**********************************************************************
412 * DPMI_CallRMProc
413 *
414 * This routine does the hard work of calling a real mode procedure.
415 */
416 int DPMI_CallRMProc( CONTEXT86 *context, LPWORD stack, int args, int iret )
417 {
418 LPWORD stack16;
419 LPVOID addr = NULL; /* avoid gcc warning */
420 RMCB *CurrRMCB;
421 int alloc = 0, already = 0;
422 BYTE *code;
423
424 TRACE("EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
425 context->Eax, context->Ebx, context->Ecx, context->Edx );
426 TRACE("ESI=%08lx EDI=%08lx ES=%04lx DS=%04lx CS:IP=%04lx:%04x, %d WORD arguments, %s\n",
427 context->Esi, context->Edi, context->SegEs, context->SegDs,
428 context->SegCs, LOWORD(context->Eip), args, iret?"IRET":"FAR" );
429
430 callrmproc_again:
431
432 /* there might be some code that just jumps to RMCBs or the like,
433 in which case following the jumps here might get us to a shortcut */
434 code = CTX_SEG_OFF_TO_LIN(context, context->SegCs, context->Eip);
435 switch (*code) {
436 case 0xe9: /* JMP NEAR */
437 context->Eip += 3 + *(WORD *)(code+1);
438 /* yeah, I know these gotos don't look good... */
439 goto callrmproc_again;
440 case 0xea: /* JMP FAR */
441 context->Eip = *(WORD *)(code+1);
442 context->SegCs = *(WORD *)(code+3);
443 /* ...but since the label is there anyway... */
444 goto callrmproc_again;
445 case 0xeb: /* JMP SHORT */
446 context->Eip += 2 + *(signed char *)(code+1);
447 /* ...because of other gotos below, so... */
448 goto callrmproc_again;
449 }
450
451 /* shortcut for chaining to internal interrupt handlers */
452 if ((context->SegCs == 0xF000) && iret)
453 {
454 DOSVM_CallBuiltinHandler( context, LOWORD(context->Eip)/4 );
455 return 0;
456 }
457
458 /* shortcut for RMCBs */
459 CurrRMCB = FirstRMCB;
460
461 while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
462 CurrRMCB = CurrRMCB->next;
463
464 if (!CurrRMCB && !MZ_Current())
465 {
466 FIXME("DPMI real-mode call using DOS VM task system, not fully tested!\n");
467 TRACE("creating VM86 task\n");
468 MZ_AllocDPMITask();
469 }
470 if (!already) {
471 if (!context->SegSs) {
472 alloc = 1; /* allocate default stack */
473 stack16 = addr = DOSMEM_GetBlock( 64, (UINT16 *)&(context->SegSs) );
474 context->Esp = 64-2;
475 stack16 += 32-1;
476 if (!addr) {
477 ERR("could not allocate default stack\n");
478 return 1;
479 }
480 } else {
481 stack16 = CTX_SEG_OFF_TO_LIN(context, context->SegSs, context->Esp);
482 }
483 context->Esp -= (args + (iret?1:0)) * sizeof(WORD);
484 stack16 -= args;
485 if (args) memcpy(stack16, stack, args*sizeof(WORD) );
486 /* push flags if iret */
487 if (iret) {
488 stack16--; args++;
489 *stack16 = LOWORD(context->EFlags);
490 }
491 /* push return address (return to interrupt wrapper) */
492 *(--stack16) = DOSVM_dpmi_segments->wrap_seg;
493 *(--stack16) = 0;
494 /* adjust stack */
495 context->Esp -= 2*sizeof(WORD);
496 already = 1;
497 }
498
499 if (CurrRMCB) {
500 /* RMCB call, invoke protected-mode handler directly */
501 DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
502 /* check if we returned to where we thought we would */
503 if ((context->SegCs != DOSVM_dpmi_segments->wrap_seg) ||
504 (LOWORD(context->Eip) != 0)) {
505 /* we need to continue at different address in real-mode space,
506 so we need to set it all up for real mode again */
507 goto callrmproc_again;
508 }
509 } else {
510 TRACE("entering real mode...\n");
511 DOSVM_Enter( context );
512 TRACE("returned from real-mode call\n");
513 }
514 if (alloc) DOSMEM_FreeBlock( addr );
515 return 0;
516 }
517
518
519 /**********************************************************************
520 * CallRMInt (WINEDOS.@)
521 */
522 void WINAPI DOSVM_CallRMInt( CONTEXT86 *context )
523 {
524 CONTEXT86 realmode_ctx;
525 FARPROC16 rm_int = DOSVM_GetRMHandler( BL_reg(context) );
526 REALMODECALL *call = CTX_SEG_OFF_TO_LIN( context,
527 context->SegEs,
528 context->Edi );
529 INT_GetRealModeContext( call, &realmode_ctx );
530
531 /* we need to check if a real-mode program has hooked the interrupt */
532 if (HIWORD(rm_int)!=0xF000) {
533 /* yup, which means we need to switch to real mode... */
534 realmode_ctx.SegCs = HIWORD(rm_int);
535 realmode_ctx.Eip = LOWORD(rm_int);
536 if (DPMI_CallRMProc( &realmode_ctx, NULL, 0, TRUE))
537 SET_CFLAG(context);
538 } else {
539 RESET_CFLAG(context);
540 /* use the IP we have instead of BL_reg, in case some apps
541 decide to move interrupts around for whatever reason... */
542 DOSVM_CallBuiltinHandler( &realmode_ctx, LOWORD(rm_int)/4 );
543 }
544 INT_SetRealModeContext( call, &realmode_ctx );
545 }
546
547
548 /**********************************************************************
549 * CallRMProc (WINEDOS.@)
550 */
551 void WINAPI DOSVM_CallRMProc( CONTEXT86 *context, int iret )
552 {
553 REALMODECALL *p = CTX_SEG_OFF_TO_LIN( context,
554 context->SegEs,
555 context->Edi );
556 CONTEXT86 context16;
557
558 TRACE("RealModeCall: EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n",
559 p->eax, p->ebx, p->ecx, p->edx);
560 TRACE(" ESI=%08lx EDI=%08lx ES=%04x DS=%04x CS:IP=%04x:%04x, %d WORD arguments, %s\n",
561 p->esi, p->edi, p->es, p->ds, p->cs, p->ip, CX_reg(context), iret?"IRET":"FAR" );
562
563 if (!(p->cs) && !(p->ip)) { /* remove this check
564 if Int21/6501 case map function
565 has been implemented */
566 SET_CFLAG(context);
567 return;
568 }
569 INT_GetRealModeContext(p, &context16);
570 DPMI_CallRMProc( &context16, ((LPWORD)MapSL(MAKESEGPTR(context->SegSs, LOWORD(context->Esp))))+3,
571 CX_reg(context), iret );
572 INT_SetRealModeContext(p, &context16);
573 }
574
575
576 /* (see dosmem.c, function DOSMEM_InitDPMI) */
577 static void StartPM( CONTEXT86 *context )
578 {
579 UINT16 cs, ss, ds, es;
580 CONTEXT86 pm_ctx;
581 DWORD psp_ofs = (DWORD)(DOSVM_psp<<4);
582 PDB16 *psp = (PDB16 *)psp_ofs;
583 HANDLE16 env_seg = psp->environment;
584 unsigned char selflags = WINE_LDT_FLAGS_DATA;
585
586 RESET_CFLAG(context);
587 dpmi_flag = AX_reg(context);
588 /* our mode switch wrapper have placed the desired CS into DX */
589 cs = alloc_pm_selector( context->Edx, WINE_LDT_FLAGS_CODE );
590 /* due to a flaw in some CPUs (at least mine), it is best to mark stack segments as 32-bit if they
591 can be used in 32-bit code. Otherwise, these CPUs may not set the high word of esp during a
592 ring transition (from kernel code) to the 16-bit stack, and this causes trouble if executing
593 32-bit code using this stack. */
594 if (dpmi_flag & 1) selflags |= WINE_LDT_FLAGS_32BIT;
595 ss = alloc_pm_selector( context->SegSs, selflags );
596 /* do the same for the data segments, just in case */
597 if (context->SegDs == context->SegSs) ds = ss;
598 else ds = alloc_pm_selector( context->SegDs, selflags );
599 es = alloc_pm_selector( DOSVM_psp, selflags );
600 /* convert environment pointer, as the spec says, but we're a bit lazy about the size here... */
601 psp->environment = alloc_pm_selector( env_seg, WINE_LDT_FLAGS_DATA );
602
603 pm_ctx = *context;
604 pm_ctx.SegCs = DOSVM_dpmi_segments->dpmi_sel;
605 /* our mode switch wrapper expects the new CS in DX, and the new SS in AX */
606 pm_ctx.Eax = ss;
607 pm_ctx.Edx = cs;
608 pm_ctx.SegDs = ds;
609 pm_ctx.SegEs = es;
610 pm_ctx.SegFs = wine_get_fs();
611 pm_ctx.SegGs = wine_get_gs();
612 pm_ctx.EFlags &= ~V86_FLAG;
613
614 TRACE("DOS program is now entering %d-bit protected mode\n",
615 DOSVM_IsDos32() ? 32 : 16);
616
617 __TRY
618 {
619 WOWCallback16Ex( 0, WCB16_REGS, 0, NULL, (DWORD *)&pm_ctx );
620 }
621 __EXCEPT(dpmi_exception_handler)
622 {
623 }
624 __ENDTRY
625
626 TRACE( "Protected mode DOS program is terminating\n" );
627
628 /*
629 * FIXME: Instead of calling ExitThread, we should release all
630 * allocated protected mode resources and call MZ_Exit
631 * using real mode context. See DPMI specification.
632 */
633 ExitThread( DPMI_retval );
634
635 #if 0
636 wine_ldt_free_entries( psp->environment, 1 );
637 psp->environment = env_seg;
638 wine_ldt_free_entries(es,1);
639 if (ds != ss) wine_ldt_free_entries(ds,1);
640 wine_ldt_free_entries(ss,1);
641 wine_ldt_free_entries(cs,1);
642 #endif
643 }
644
645 static RMCB *DPMI_AllocRMCB( void )
646 {
647 RMCB *NewRMCB = HeapAlloc(GetProcessHeap(), 0, sizeof(RMCB));
648 UINT16 uParagraph;
649
650 if (NewRMCB)
651 {
652 LPVOID RMCBmem = DOSMEM_GetBlock(4, &uParagraph);
653 LPBYTE p = RMCBmem;
654
655 *p++ = 0xcd; /* RMCB: */
656 *p++ = 0x31; /* int $0x31 */
657 /* it is the called procedure's task to change the return CS:EIP
658 the DPMI 0.9 spec states that if it doesn't, it will be called again */
659 *p++ = 0xeb;
660 *p++ = 0xfc; /* jmp RMCB */
661 NewRMCB->address = MAKELONG(0, uParagraph);
662 NewRMCB->next = FirstRMCB;
663 FirstRMCB = NewRMCB;
664 }
665 return NewRMCB;
666 }
667
668
669 FARPROC16 WINAPI DPMI_AllocInternalRMCB( RMCBPROC proc )
670 {
671 RMCB *NewRMCB = DPMI_AllocRMCB();
672
673 if (NewRMCB) {
674 NewRMCB->proc_ofs = (DWORD)proc;
675 NewRMCB->proc_sel = 0;
676 NewRMCB->regs_ofs = 0;
677 NewRMCB->regs_sel = 0;
678 return (FARPROC16)(NewRMCB->address);
679 }
680 return NULL;
681 }
682
683
684 static int DPMI_FreeRMCB( DWORD address )
685 {
686 RMCB *CurrRMCB = FirstRMCB;
687 RMCB *PrevRMCB = NULL;
688
689 while (CurrRMCB && (CurrRMCB->address != address))
690 {
691 PrevRMCB = CurrRMCB;
692 CurrRMCB = CurrRMCB->next;
693 }
694 if (CurrRMCB)
695 {
696 if (PrevRMCB)
697 PrevRMCB->next = CurrRMCB->next;
698 else
699 FirstRMCB = CurrRMCB->next;
700 DOSMEM_FreeBlock(PTR_REAL_TO_LIN(SELECTOROF(CurrRMCB->address),OFFSETOF(CurrRMCB->address)));
701 HeapFree(GetProcessHeap(), 0, CurrRMCB);
702 return 0;
703 }
704 return 1;
705 }
706
707
708 void WINAPI DPMI_FreeInternalRMCB( FARPROC16 proc )
709 {
710 DPMI_FreeRMCB( (DWORD)proc );
711 }
712
713
714 /**********************************************************************
715 * DOSVM_RawModeSwitchHandler
716 *
717 * DPMI Raw Mode Switch handler
718 */
719 void WINAPI DOSVM_RawModeSwitchHandler( CONTEXT86 *context )
720 {
721 CONTEXT86 rm_ctx;
722 int ret;
723
724 /* initialize real-mode context as per spec */
725 memset(&rm_ctx, 0, sizeof(rm_ctx));
726 rm_ctx.SegDs = AX_reg(context);
727 rm_ctx.SegEs = CX_reg(context);
728 rm_ctx.SegSs = DX_reg(context);
729 rm_ctx.Esp = context->Ebx;
730 rm_ctx.SegCs = SI_reg(context);
731 rm_ctx.Eip = context->Edi;
732 rm_ctx.Ebp = context->Ebp;
733 rm_ctx.SegFs = 0;
734 rm_ctx.SegGs = 0;
735
736 /* Copy interrupt state. */
737 if (NtCurrentTeb()->dpmi_vif)
738 rm_ctx.EFlags = V86_FLAG | VIF_MASK;
739 else
740 rm_ctx.EFlags = V86_FLAG;
741
742 /* enter real mode again */
743 TRACE("re-entering real mode at %04lx:%04lx\n",rm_ctx.SegCs,rm_ctx.Eip);
744 ret = DOSVM_Enter( &rm_ctx );
745 /* when the real-mode stuff call its mode switch address,
746 DOSVM_Enter will return and we will continue here */
747
748 if (ret<0) {
749 ERR("Sync lost!\n");
750 /* if the sync was lost, there's no way to recover */
751 ExitProcess(1);
752 }
753
754 /* alter protected-mode context as per spec */
755 context->SegDs = LOWORD(rm_ctx.Eax);
756 context->SegEs = LOWORD(rm_ctx.Ecx);
757 context->SegSs = LOWORD(rm_ctx.Edx);
758 context->Esp = rm_ctx.Ebx;
759 context->SegCs = LOWORD(rm_ctx.Esi);
760 context->Eip = rm_ctx.Edi;
761 context->Ebp = rm_ctx.Ebp;
762 context->SegFs = 0;
763 context->SegGs = 0;
764
765 /* Copy interrupt state. */
766 if (rm_ctx.EFlags & VIF_MASK)
767 NtCurrentTeb()->dpmi_vif = 1;
768 else
769 NtCurrentTeb()->dpmi_vif = 0;
770
771 /* Return to new address and hope that we didn't mess up */
772 TRACE("re-entering protected mode at %04lx:%08lx\n",
773 context->SegCs, context->Eip);
774 }
775
776
777 /**********************************************************************
778 * AllocRMCB (WINEDOS.@)
779 */
780 void WINAPI DOSVM_AllocRMCB( CONTEXT86 *context )
781 {
782 RMCB *NewRMCB = DPMI_AllocRMCB();
783
784 TRACE("Function to call: %04x:%04x\n", (WORD)context->SegDs, SI_reg(context) );
785
786 if (NewRMCB)
787 {
788 NewRMCB->proc_ofs = DOSVM_IsDos32() ? context->Esi : LOWORD(context->Esi);
789 NewRMCB->proc_sel = context->SegDs;
790 NewRMCB->regs_ofs = DOSVM_IsDos32() ? context->Edi : LOWORD(context->Edi);
791 NewRMCB->regs_sel = context->SegEs;
792 SET_CX( context, HIWORD(NewRMCB->address) );
793 SET_DX( context, LOWORD(NewRMCB->address) );
794 }
795 else
796 {
797 SET_AX( context, 0x8015 ); /* callback unavailable */
798 SET_CFLAG(context);
799 }
800 }
801
802
803 /**********************************************************************
804 * FreeRMCB (WINEDOS.@)
805 */
806 void WINAPI DOSVM_FreeRMCB( CONTEXT86 *context )
807 {
808 FIXME("callback address: %04x:%04x\n",
809 CX_reg(context), DX_reg(context));
810
811 if (DPMI_FreeRMCB(MAKELONG(DX_reg(context), CX_reg(context)))) {
812 SET_AX( context, 0x8024 ); /* invalid callback address */
813 SET_CFLAG(context);
814 }
815 }
816
817
818 /**********************************************************************
819 * DOSVM_CheckWrappers
820 *
821 * Check if this was really a wrapper call instead of an interrupt.
822 */
823 BOOL DOSVM_CheckWrappers( CONTEXT86 *context )
824 {
825 if (context->SegCs==DOSVM_dpmi_segments->dpmi_seg) {
826 /* This is the protected mode switch */
827 StartPM(context);
828 return TRUE;
829 }
830 else if (context->SegCs==DOSVM_dpmi_segments->xms_seg)
831 {
832 /* This is the XMS driver entry point */
833 XMS_Handler(context);
834 return TRUE;
835 }
836 else
837 {
838 /* Check for RMCB */
839 RMCB *CurrRMCB = FirstRMCB;
840
841 while (CurrRMCB && (HIWORD(CurrRMCB->address) != context->SegCs))
842 CurrRMCB = CurrRMCB->next;
843
844 if (CurrRMCB) {
845 /* RMCB call, propagate to protected-mode handler */
846 DPMI_CallRMCBProc(context, CurrRMCB, dpmi_flag);
847 return TRUE;
848 }
849 }
850
851 return FALSE;
852 }
853
854 /**********************************************************************
855 * DOSVM_Int31Handler (WINEDOS16.149)
856 *
857 * Handler for int 31h (DPMI).
858 */
859 void WINAPI DOSVM_Int31Handler( CONTEXT86 *context )
860 {
861 RESET_CFLAG(context);
862 switch(AX_reg(context))
863 {
864 case 0x0000: /* Allocate LDT descriptors */
865 TRACE( "allocate LDT descriptors (%d)\n", CX_reg(context) );
866 {
867 WORD sel = AllocSelectorArray16( CX_reg(context) );
868 if(!sel)
869 {
870 TRACE( "failed\n" );
871 SET_AX( context, 0x8011 ); /* descriptor unavailable */
872 SET_CFLAG( context );
873 }
874 else
875 {
876 TRACE( "success, array starts at 0x%04x\n", sel );
877 SET_AX( context, sel );
878 }
879 }
880 break;
881
882 case 0x0001: /* Free LDT descriptor */
883 TRACE( "free LDT descriptor (0x%04x)\n", BX_reg(context) );
884 if (FreeSelector16( BX_reg(context) ))
885 {
886 SET_AX( context, 0x8022 ); /* invalid selector */
887 SET_CFLAG( context );
888 }
889 else
890 {
891 /* If a segment register contains the selector being freed, */
892 /* set it to zero. */
893 if (!((context->SegDs^BX_reg(context)) & ~3)) context->SegDs = 0;
894 if (!((context->SegEs^BX_reg(context)) & ~3)) context->SegEs = 0;
895 if (!((context->SegFs^BX_reg(context)) & ~3)) context->SegFs = 0;
896 if (!((context->SegGs^BX_reg(context)) & ~3)) context->SegGs = 0;
897 }
898 break;
899
900 case 0x0002: /* Real mode segment to descriptor */
901 TRACE( "real mode segment to descriptor (0x%04x)\n", BX_reg(context) );
902 {
903 WORD entryPoint = 0; /* KERNEL entry point for descriptor */
904 switch(BX_reg(context))
905 {
906 case 0x0000: entryPoint = 183; break; /* __0000H */
907 case 0x0040: entryPoint = 193; break; /* __0040H */
908 case 0xa000: entryPoint = 174; break; /* __A000H */
909 case 0xb000: entryPoint = 181; break; /* __B000H */
910 case 0xb800: entryPoint = 182; break; /* __B800H */
911 case 0xc000: entryPoint = 195; break; /* __C000H */
912 case 0xd000: entryPoint = 179; break; /* __D000H */
913 case 0xe000: entryPoint = 190; break; /* __E000H */
914 case 0xf000: entryPoint = 194; break; /* __F000H */
915 default:
916 SET_AX( context, DOSMEM_AllocSelector(BX_reg(context)) );
917 break;
918 }
919 if (entryPoint)
920 {
921 FARPROC16 proc = GetProcAddress16( GetModuleHandle16( "KERNEL" ),
922 (LPCSTR)(ULONG_PTR)entryPoint );
923 SET_AX( context, LOWORD(proc) );
924 }
925 }
926 break;
927
928 case 0x0003: /* Get next selector increment */
929 TRACE("get selector increment (__AHINCR)\n");
930 context->Eax = __AHINCR;
931 break;
932
933 case 0x0004: /* Lock selector (not supported) */
934 FIXME("lock selector not supported\n");
935 context->Eax = 0; /* FIXME: is this a correct return value? */
936 break;
937
938 case 0x0005: /* Unlock selector (not supported) */
939 FIXME("unlock selector not supported\n");
940 context->Eax = 0; /* FIXME: is this a correct return value? */
941 break;
942
943 case 0x0006: /* Get selector base address */
944 TRACE( "get selector base address (0x%04x)\n", BX_reg(context) );
945 {
946 LDT_ENTRY entry;
947 WORD sel = BX_reg(context);
948 wine_ldt_get_entry( sel, &entry );
949 if (wine_ldt_is_empty(&entry))
950 {
951 context->Eax = 0x8022; /* invalid selector */
952 SET_CFLAG(context);
953 }
954 else
955 {
956 void *base = wine_ldt_get_base(&entry);
957 SET_CX( context, HIWORD(base) );
958 SET_DX( context, LOWORD(base) );
959 }
960 }
961 break;
962
963 case 0x0007: /* Set selector base address */
964 {
965 DWORD base = MAKELONG( DX_reg(context), CX_reg(context) );
966 WORD sel = BX_reg(context);
967 TRACE( "set selector base address (0x%04x,0x%08lx)\n", sel, base );
968
969 /* check if Win16 app wants to access lower 64K of DOS memory */
970 if (base < 0x10000 && DOSVM_IsWin16())
971 DOSMEM_Init(TRUE);
972
973 SetSelectorBase( sel, base );
974 }
975 break;
976
977 case 0x0008: /* Set selector limit */
978 {
979 DWORD limit = MAKELONG( DX_reg(context), CX_reg(context) );
980 TRACE( "set selector limit (0x%04x,0x%08lx)\n",
981 BX_reg(context), limit );
982 SetSelectorLimit16( BX_reg(context), limit );
983 }
984 break;
985
986 case 0x0009: /* Set selector access rights */
987 TRACE( "set selector access rights(0x%04x,0x%04x)\n",
988 BX_reg(context), CX_reg(context) );
989 SelectorAccessRights16( BX_reg(context), 1, CX_reg(context) );
990 break;
991
992 case 0x000a: /* Allocate selector alias */
993 TRACE( "allocate selector alias (0x%04x)\n", BX_reg(context) );
994 SET_AX( context, AllocCStoDSAlias16( BX_reg(context) ) );
995 if (!AX_reg(context))
996 {
997 SET_AX( context, 0x8011 ); /* descriptor unavailable */
998 SET_CFLAG(context);
999 }
1000 break;
1001
1002 case 0x000b: /* Get descriptor */
1003 TRACE( "get descriptor (0x%04x)\n", BX_reg(context) );
1004 {
1005 LDT_ENTRY *entry = (LDT_ENTRY*)CTX_SEG_OFF_TO_LIN( context,
1006 context->SegEs,
1007 context->Edi );
1008 wine_ldt_get_entry( BX_reg(context), entry );
1009 }
1010 break;
1011
1012 case 0x000c: /* Set descriptor */
1013 TRACE( "set descriptor (0x%04x)\n", BX_reg(context) );
1014 {
1015 LDT_ENTRY *entry = (LDT_ENTRY*)CTX_SEG_OFF_TO_LIN( context,
1016 context->SegEs,
1017 context->Edi );
1018 wine_ldt_set_entry( BX_reg(context), entry );
1019 }
1020 break;
1021
1022 case 0x000d: /* Allocate specific LDT descriptor */
1023 FIXME( "allocate descriptor (0x%04x), stub!\n", BX_reg(context) );
1024 SET_AX( context, 0x8011 ); /* descriptor unavailable */
1025 SET_CFLAG( context );
1026 break;
1027
1028 case 0x000e: /* Get Multiple Descriptors (1.0) */
1029 FIXME( "get multiple descriptors - unimplemented\n" );
1030 break;
1031
1032 case 0x000f: /* Set Multiple Descriptors (1.0) */
1033 FIXME( "set multiple descriptors - unimplemented\n" );
1034 break;
1035
1036 case 0x0100: /* Allocate DOS memory block */
1037 TRACE( "allocate DOS memory block (0x%x paragraphs)\n", BX_reg(context) );
1038 {
1039 DWORD dw = GlobalDOSAlloc16( (DWORD)BX_reg(context) << 4 );
1040 if (dw) {
1041 SET_AX( context, HIWORD(dw) );
1042 SET_DX( context, LOWORD(dw) );
1043 } else {
1044 SET_AX( context, 0x0008 ); /* insufficient memory */
1045 SET_BX( context, DOSMEM_Available() >> 4 );
1046 SET_CFLAG(context);
1047 }
1048 break;
1049 }
1050
1051 case 0x0101: /* Free DOS memory block */
1052 TRACE( "free DOS memory block (0x%04x)\n", DX_reg(context) );
1053 {
1054 WORD error = GlobalDOSFree16( DX_reg(context) );
1055 if (error) {
1056 SET_AX( context, 0x0009 ); /* memory block address invalid */
1057 SET_CFLAG( context );
1058 }
1059 }
1060 break;
1061
1062 case 0x0102: /* Resize DOS Memory Block */
1063 FIXME( "resize DOS memory block (0x%04x, 0x%x paragraphs) - unimplemented\n",
1064 DX_reg(context), BX_reg(context) );
1065 break;
1066
1067 case 0x0200: /* get real mode interrupt vector */
1068 TRACE( "get realmode interupt vector (0x%02x)\n",
1069 BL_reg(context) );
1070 {
1071 FARPROC16 proc = DOSVM_GetRMHandler( BL_reg(context) );
1072 SET_CX( context, SELECTOROF(proc) );
1073 SET_DX( context, OFFSETOF(proc) );
1074 }
1075 break;
1076
1077 case 0x0201: /* set real mode interrupt vector */
1078 TRACE( "set realmode interrupt vector (0x%02x, 0x%04x:0x%04x)\n",
1079 BL_reg(context), CX_reg(context), DX_reg(context) );
1080 DOSVM_SetRMHandler( BL_reg(context),
1081 (FARPROC16)MAKESEGPTR(CX_reg(context), DX_reg(context)) );
1082 break;
1083
1084 case 0x0202: /* Get Processor Exception Handler Vector */
1085 FIXME( "Get Processor Exception Handler Vector (0x%02x)\n",
1086 BL_reg(context) );
1087 if (DOSVM_IsDos32())
1088 {
1089 SET_CX( context, 0 );
1090 context->Edx = 0;
1091 }
1092 else
1093 {
1094 SET_CX( context, 0 );
1095 SET_DX( context, 0 );
1096 }
1097 break;
1098
1099 case 0x0203: /* Set Processor Exception Handler Vector */
1100 FIXME( "Set Processor Exception Handler Vector (0x%02x)\n",
1101 BL_reg(context) );
1102 break;
1103
1104 case 0x0204: /* Get protected mode interrupt vector */
1105 TRACE("get protected mode interrupt handler (0x%02x)\n",
1106 BL_reg(context));
1107 if (DOSVM_IsDos32())
1108 {
1109 FARPROC48 handler = DOSVM_GetPMHandler48( BL_reg(context) );
1110 SET_CX( context, handler.selector );
1111 context->Edx = handler.offset;
1112 }
1113 else
1114 {
1115 FARPROC16 handler = DOSVM_GetPMHandler16( BL_reg(context) );
1116 SET_CX( context, SELECTOROF(handler) );
1117 SET_DX( context, OFFSETOF(handler) );
1118 }
1119 break;
1120
1121 case 0x0205: /* Set protected mode interrupt vector */
1122 TRACE("set protected mode interrupt handler (0x%02x,0x%04x:0x%08lx)\n",
1123 BL_reg(context), CX_reg(context), context->Edx);
1124 if (DOSVM_IsDos32())
1125 {
1126 FARPROC48 handler;
1127 handler.selector = CX_reg(context);
1128 handler.offset = context->Edx;
1129 DOSVM_SetPMHandler48( BL_reg(context), handler );
1130 }
1131 else
1132 {
1133 FARPROC16 handler;
1134 handler = (FARPROC16)MAKESEGPTR( CX_reg(context), DX_reg(context));
1135 DOSVM_SetPMHandler16( BL_reg(context), handler );
1136 }
1137 break;
1138
1139 case 0x0300: /* Simulate real mode interrupt */
1140 TRACE( "Simulate real mode interrupt %02x.\n", BL_reg(context));
1141 DOSVM_CallRMInt( context );
1142 break;
1143
1144 case 0x0301: /* Call real mode procedure with far return */
1145 TRACE( "Call real mode procedure with far return.\n" );
1146 DOSVM_CallRMProc( context, FALSE );
1147 break;
1148
1149 case 0x0302: /* Call real mode procedure with interrupt return */
1150 TRACE( "Call real mode procedure with interrupt return.\n" );
1151 DOSVM_CallRMProc( context, TRUE );
1152 break;
1153
1154 case 0x0303: /* Allocate Real Mode Callback Address */
1155 TRACE( "Allocate real mode callback address.\n" );
1156 DOSVM_AllocRMCB( context );
1157 break;
1158
1159 case 0x0304: /* Free Real Mode Callback Address */
1160 TRACE( "Free real mode callback address.\n" );
1161 DOSVM_FreeRMCB( context );
1162 break;
1163
1164 case 0x0305: /* Get State Save/Restore Addresses */
1165 TRACE("get state save/restore addresses\n");
1166 /* we probably won't need this kind of state saving */
1167 SET_AX( context, 0 );
1168
1169 /* real mode: just point to the lret */
1170 SET_BX( context, DOSVM_dpmi_segments->wrap_seg );
1171 SET_CX( context, 2 );
1172
1173 /* protected mode: don't have any handler yet... */
1174 /* FIXME: Use DI in 16-bit DPMI and EDI in 32-bit DPMI */
1175 FIXME("no protected-mode dummy state save/restore handler yet\n");
1176 SET_SI( context, 0 );
1177 context->Edi = 0;
1178 break;
1179
1180 case 0x0306: /* Get Raw Mode Switch Addresses */
1181 TRACE("get raw mode switch addresses\n");
1182
1183 /* real mode, point to standard DPMI return wrapper */
1184 SET_BX( context, DOSVM_dpmi_segments->wrap_seg );
1185 SET_CX( context, 0 );
1186
1187 /* protected mode, point to DPMI call wrapper */
1188 /* FIXME: Use DI in 16-bit DPMI and EDI in 32-bit DPMI */
1189 /* FIXME: Doesn't work in DPMI32... */
1190 SET_SI( context, DOSVM_dpmi_segments->dpmi_sel );
1191 context->Edi = 8; /* offset of the INT 0x31 call */
1192 break;
1193
1194 case 0x0400: /* Get DPMI version */
1195 TRACE("get DPMI version\n");
1196 {
1197 SYSTEM_INFO si;
1198
1199 GetSystemInfo(&si);
1200 SET_AX( context, 0x005a ); /* DPMI version 0.90 */
1201 SET_BX( context, 0x0005 ); /* Flags: 32-bit, virtual memory */
1202 SET_CL( context, si.wProcessorLevel );
1203 SET_DX( context, 0x0870 ); /* Master/slave interrupt controller base */
1204 }
1205 break;
1206
1207 case 0x0401: /* Get DPMI Capabilities (1.0) */
1208 FIXME( "get dpmi capabilities - unimplemented\n");
1209 break;
1210
1211 case 0x0500: /* Get free memory information */
1212 TRACE("get free memory information\n");
1213 {
1214 MEMORYSTATUS status;
1215
1216 /* the layout is just the same as MEMMANINFO, but without
1217 * the dwSize entry.
1218 */
1219 struct
1220 {
1221 DWORD dwLargestFreeBlock;
1222 DWORD dwMaxPagesAvailable;
1223 DWORD dwMaxPagesLockable;
1224 DWORD dwTotalLinearSpace;
1225 DWORD dwTotalUnlockedPages;
1226 DWORD dwFreePages;
1227 DWORD dwTotalPages;
1228 DWORD dwFreeLinearSpace;
1229 DWORD dwSwapFilePages;
1230 WORD wPageSize;
1231 } *info = CTX_SEG_OFF_TO_LIN( context, context->SegEs, context->Edi );
1232
1233 GlobalMemoryStatus( &status );
1234 info->wPageSize = getpagesize();
1235 info->dwLargestFreeBlock = status.dwAvailVirtual;
1236 info->dwMaxPagesAvailable = info->dwLargestFreeBlock / info->wPageSize;
1237 info->dwMaxPagesLockable = info->dwMaxPagesAvailable;
1238 info->dwTotalLinearSpace = status.dwTotalVirtual / info->wPageSize;
1239 info->dwTotalUnlockedPages = info->dwTotalLinearSpace;
1240 info->dwFreePages = info->dwMaxPagesAvailable;
1241 info->dwTotalPages = info->dwTotalLinearSpace;
1242 info->dwFreeLinearSpace = info->dwMaxPagesAvailable;
1243 info->dwSwapFilePages = status.dwTotalPageFile / info->wPageSize;
1244 break;
1245 }
1246
1247 case 0x0501: /* Allocate memory block */
1248 {
1249 DWORD size = MAKELONG( CX_reg(context), BX_reg(context) );
1250 BYTE *ptr;
1251
1252 TRACE( "allocate memory block (%ld bytes)\n", size );
1253
1254 ptr = (BYTE *)DPMI_xalloc( size );
1255 if (!ptr)
1256 {
1257 SET_AX( context, 0x8012 ); /* linear memory not available */
1258 SET_CFLAG(context);
1259 }
1260 else
1261 {
1262 SET_BX( context, HIWORD(ptr) );
1263 SET_CX( context, LOWORD(ptr) );
1264 SET_SI( context, HIWORD(ptr) );
1265 SET_DI( context, LOWORD(ptr) );
1266 }
1267 break;
1268 }
1269
1270 case 0x0502: /* Free memory block */
1271 {
1272 DWORD handle = MAKELONG( DI_reg(context), SI_reg(context) );
1273 TRACE( "free memory block (0x%08lx)\n", handle );
1274 DPMI_xfree( (void *)handle );
1275 }
1276 break;
1277
1278 case 0x0503: /* Resize memory block */
1279 {
1280 DWORD size = MAKELONG( CX_reg(context), BX_reg(context) );
1281 DWORD handle = MAKELONG( DI_reg(context), SI_reg(context) );
1282 BYTE *ptr;
1283
1284 TRACE( "resize memory block (0x%08lx, %ld bytes)\n", handle, size );
1285
1286 ptr = (BYTE *)DPMI_xrealloc( (void *)handle, size );
1287 if (!ptr)
1288 {
1289 SET_AX( context, 0x8012 ); /* linear memory not available */
1290 SET_CFLAG(context);
1291 } else {
1292 SET_BX( context, HIWORD(ptr) );
1293 SET_CX( context, LOWORD(ptr) );
1294 SET_SI( context, HIWORD(ptr) );
1295 SET_DI( context, LOWORD(ptr) );
1296 }
1297 }
1298 break;
1299
1300 case 0x0507: /* Set page attributes (1.0) */
1301 FIXME( "set page attributes - unimplemented\n" );
1302 break; /* Just ignore it */
1303
1304 case 0x0600: /* Lock linear region */
1305 TRACE( "lock linear region - ignored (no paging)\n" );
1306 break;
1307
1308 case 0x0601: /* Unlock linear region */
1309 TRACE( "unlock linear region - ignored (no paging)\n" );
1310 break;
1311
1312 case 0x0602: /* Mark real mode region as pageable */
1313 TRACE( "mark real mode region as pageable - ignored (no paging)\n" );
1314 break;
1315
1316 case 0x0603: /* Relock real mode region */
1317 TRACE( "relock real mode region - ignored (no paging)\n" );
1318 break;
1319
1320 case 0x0604: /* Get page size */
1321 TRACE("get pagesize\n");
1322 SET_BX( context, HIWORD(getpagesize()) );
1323 SET_CX( context, LOWORD(getpagesize()) );
1324 break;
1325
1326 case 0x0700: /* Mark pages as paging candidates */
1327 TRACE( "mark pages as paging candidates - ignored (no paging)\n" );
1328 break;
1329
1330 case 0x0701: /* Discard pages */
1331 TRACE( "discard pages - ignored (no paging)\n" );
1332 break;
1333
1334 case 0x0702: /* Mark page as demand-paging candidate */
1335 TRACE( "mark page as demand-paging candidate - ignored (no paging)\n" );
1336 break;
1337
1338 case 0x0703: /* Discard page contents */
1339 TRACE( "discard page contents - ignored (no paging)\n" );
1340 break;
1341
1342 case 0x0800: /* Physical address mapping */
1343 FIXME( "physical address mapping (0x%08lx) - unimplemented\n",
1344 MAKELONG(CX_reg(context),BX_reg(context)) );
1345 break;
1346
1347 case 0x0900: /* Get and Disable Virtual Interrupt State */
1348 TRACE( "Get and Disable Virtual Interrupt State: %ld\n",
1349 NtCurrentTeb()->dpmi_vif );
1350 SET_AL( context, NtCurrentTeb()->dpmi_vif ? 1 : 0 );
1351 NtCurrentTeb()->dpmi_vif = 0;
1352 break;
1353
1354 case 0x0901: /* Get and Enable Virtual Interrupt State */
1355 TRACE( "Get and Enable Virtual Interrupt State: %ld\n",
1356 NtCurrentTeb()->dpmi_vif );
1357 SET_AL( context, NtCurrentTeb()->dpmi_vif ? 1 : 0 );
1358 NtCurrentTeb()->dpmi_vif = 1;
1359 break;
1360
1361 case 0x0902: /* Get Virtual Interrupt State */
1362 TRACE( "Get Virtual Interrupt State: %ld\n",
1363 NtCurrentTeb()->dpmi_vif );
1364 SET_AL( context, NtCurrentTeb()->dpmi_vif ? 1 : 0 );
1365 break;
1366
1367 case 0x0e00: /* Get Coprocessor Status (1.0) */
1368 /*
1369 * Return status in AX bits:
1370 * B0 - MPv (MP bit in the virtual MSW/CR0)
1371 * 0 = numeric coprocessor is disabled for this client
1372 * 1 = numeric coprocessor is enabled for this client
1373 * B1 - EMv (EM bit in the virtual MSW/CR0)
1374 * 0 = client is not emulating coprocessor instructions
1375 * 1 = client is emulating coprocessor instructions
1376 * B2 - MPr (MP bit from the actual MSW/CR0)
1377 * 0 = numeric coprocessor is not present
1378 * 1 = numeric coprocessor is present
1379 * B3 - EMr (EM bit from the actual MSW/CR0)
1380 * 0 = host is not emulating coprocessor instructions
1381 * 1 = host is emulating coprocessor instructions
1382 * B4-B7 - coprocessor type
1383 * 00H = no coprocessor
1384 * 02H = 80287
1385 * 03H = 80387
1386 * 04H = 80486 with numeric coprocessor
1387 * 05H-0FH = reserved for future numeric processors
1388 */
1389 TRACE( "Get Coprocessor Status\n" );
1390 SET_AX( context, 69 ); /* 486, coprocessor present and enabled */
1391 break;
1392
1393 case 0x0e01: /* Set Coprocessor Emulation (1.0) */
1394 /*
1395 * See function 0x0e00.
1396 * BX bit B0 is new value for MPv.
1397 * BX bit B1 is new value for EMv.
1398 */
1399 if (BX_reg(context) != 1)
1400 FIXME( "Set Coprocessor Emulation to %d - unimplemented\n",
1401 BX_reg(context) );
1402 else
1403 TRACE( "Set Coprocessor Emulation - ignored\n" );
1404 break;
1405
1406 default:
1407 INT_BARF( context, 0x31 );
1408 SET_AX( context, 0x8001 ); /* unsupported function */
1409 SET_CFLAG(context);
1410 break;
1411 }
1412 }
Maarten's multimedia branch