SELMAll.cpp@ 28112

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1	/* $Id: SELMAll.cpp 26278 2010-02-05 04:53:34Z vboxsync $ */
2	/** @file
3	* SELM All contexts.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22
23	/*******************************************************************************
24	* Header Files *
25	*******************************************************************************/
26	#define LOG_GROUP LOG_GROUP_SELM
27	#include <VBox/selm.h>
28	#include <VBox/stam.h>
29	#include <VBox/mm.h>
30	#include <VBox/pgm.h>
31	#include "SELMInternal.h"
32	#include <VBox/vm.h>
33	#include <VBox/x86.h>
34	#include <VBox/err.h>
35	#include <VBox/param.h>
36	#include <iprt/assert.h>
37	#include <VBox/log.h>
38	#include <VBox/vmm.h>
39
40
41
42	#ifndef IN_RING0
43
44	/**
45	* Converts a GC selector based address to a flat address.
46	*
47	* No limit checks are done. Use the SELMToFlat() or SELMValidate() functions
48	* for that.
49	*
50	* @returns Flat address.
51	* @param pVM VM Handle.
52	* @param Sel Selector part.
53	* @param Addr Address part.
54	* @remarks Don't use when in long mode.
55	*/
56	VMMDECL(RTGCPTR) SELMToFlatBySel(PVM pVM, RTSEL Sel, RTGCPTR Addr)
57	{
58	Assert(pVM->cCpus == 1 && !CPUMIsGuestInLongMode(VMMGetCpu(pVM))); /* DON'T USE! */
59
60	/** @todo check the limit. */
61	X86DESC Desc;
62	if (!(Sel & X86_SEL_LDT))
63	Desc = pVM->selm.s.CTX_SUFF(paGdt)[Sel >> X86_SEL_SHIFT];
64	else
65	{
66	/** @todo handle LDT pages not present! */
67	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.CTX_SUFF(pvLdt) + pVM->selm.s.offLdtHyper);
68	Desc = paLDT[Sel >> X86_SEL_SHIFT];
69	}
70
71	return (RTGCPTR)(((RTGCUINTPTR)Addr + X86DESC_BASE(Desc)) & 0xffffffff);
72	}
73	#endif /* !IN_RING0 */
74
75
76	/**
77	* Converts a GC selector based address to a flat address.
78	*
79	* No limit checks are done. Use the SELMToFlat() or SELMValidate() functions
80	* for that.
81	*
82	* @returns Flat address.
83	* @param pVM VM Handle.
84	* @param SelReg Selector register
85	* @param pCtxCore CPU context
86	* @param Addr Address part.
87	*/
88	VMMDECL(RTGCPTR) SELMToFlat(PVM pVM, DIS_SELREG SelReg, PCPUMCTXCORE pCtxCore, RTGCPTR Addr)
89	{
90	PCPUMSELREGHID pHiddenSel;
91	RTSEL Sel;
92	int rc;
93	PVMCPU pVCpu = VMMGetCpu(pVM);
94
95	rc = DISFetchRegSegEx(pCtxCore, SelReg, &Sel, &pHiddenSel); AssertRC(rc);
96
97	/*
98	* Deal with real & v86 mode first.
99	*/
100	if ( pCtxCore->eflags.Bits.u1VM
101	\|\| CPUMIsGuestInRealMode(pVCpu))
102	{
103	RTGCUINTPTR uFlat = (RTGCUINTPTR)Addr & 0xffff;
104	if (CPUMAreHiddenSelRegsValid(pVM))
105	uFlat += pHiddenSel->u64Base;
106	else
107	uFlat += ((RTGCUINTPTR)Sel << 4);
108	return (RTGCPTR)uFlat;
109	}
110
111	#ifdef IN_RING0
112	Assert(CPUMAreHiddenSelRegsValid(pVM));
113	#else
114	/** @todo when we're in 16 bits mode, we should cut off the address as well.. */
115	if (!CPUMAreHiddenSelRegsValid(pVM))
116	return SELMToFlatBySel(pVM, Sel, Addr);
117	#endif
118
119	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0 (Intel® 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
120	if ( pCtxCore->csHid.Attr.n.u1Long
121	&& CPUMIsGuestInLongMode(pVCpu))
122	{
123	switch (SelReg)
124	{
125	case DIS_SELREG_FS:
126	case DIS_SELREG_GS:
127	return (RTGCPTR)(pHiddenSel->u64Base + Addr);
128
129	default:
130	return Addr; /* base 0 */
131	}
132	}
133
134	/* AMD64 manual: compatibility mode ignores the high 32 bits when calculating an effective address. */
135	Assert(pHiddenSel->u64Base <= 0xffffffff);
136	return ((pHiddenSel->u64Base + (RTGCUINTPTR)Addr) & 0xffffffff);
137	}
138
139
140	/**
141	* Converts a GC selector based address to a flat address.
142	*
143	* Some basic checking is done, but not all kinds yet.
144	*
145	* @returns VBox status
146	* @param pVM VM Handle.
147	* @param SelReg Selector register
148	* @param pCtxCore CPU context
149	* @param Addr Address part.
150	* @param fFlags SELMTOFLAT_FLAGS_*
151	* GDT entires are valid.
152	* @param ppvGC Where to store the GC flat address.
153	*/
154	VMMDECL(int) SELMToFlatEx(PVM pVM, DIS_SELREG SelReg, PCCPUMCTXCORE pCtxCore, RTGCPTR Addr, unsigned fFlags, PRTGCPTR ppvGC)
155	{
156	/*
157	* Fetch the selector first.
158	*/
159	PCPUMSELREGHID pHiddenSel;
160	RTSEL Sel;
161	PVMCPU pVCpu = VMMGetCpu(pVM);
162
163	int rc = DISFetchRegSegEx(pCtxCore, SelReg, &Sel, &pHiddenSel);
164	AssertRC(rc);
165
166	/*
167	* Deal with real & v86 mode first.
168	*/
169	if ( pCtxCore->eflags.Bits.u1VM
170	\|\| CPUMIsGuestInRealMode(pVCpu))
171	{
172	RTGCUINTPTR uFlat = (RTGCUINTPTR)Addr & 0xffff;
173	if (ppvGC)
174	{
175	if ( pHiddenSel
176	&& CPUMAreHiddenSelRegsValid(pVM))
177	*ppvGC = (RTGCPTR)(pHiddenSel->u64Base + uFlat);
178	else
179	*ppvGC = (RTGCPTR)(((RTGCUINTPTR)Sel << 4) + uFlat);
180	}
181	return VINF_SUCCESS;
182	}
183
184
185	uint32_t u32Limit;
186	RTGCPTR pvFlat;
187	uint32_t u1Present, u1DescType, u1Granularity, u4Type;
188
189	/** @todo when we're in 16 bits mode, we should cut off the address as well.. */
190	#ifndef IN_RC
191	if ( pHiddenSel
192	&& CPUMAreHiddenSelRegsValid(pVM))
193	{
194	bool fCheckLimit = true;
195
196	u1Present = pHiddenSel->Attr.n.u1Present;
197	u1Granularity = pHiddenSel->Attr.n.u1Granularity;
198	u1DescType = pHiddenSel->Attr.n.u1DescType;
199	u4Type = pHiddenSel->Attr.n.u4Type;
200	u32Limit = pHiddenSel->u32Limit;
201
202	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0 (Intel® 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
203	if ( pCtxCore->csHid.Attr.n.u1Long
204	&& CPUMIsGuestInLongMode(pVCpu))
205	{
206	fCheckLimit = false;
207	switch (SelReg)
208	{
209	case DIS_SELREG_FS:
210	case DIS_SELREG_GS:
211	pvFlat = (pHiddenSel->u64Base + Addr);
212	break;
213
214	default:
215	pvFlat = Addr;
216	break;
217	}
218	}
219	else
220	{
221	/* AMD64 manual: compatibility mode ignores the high 32 bits when calculating an effective address. */
222	Assert(pHiddenSel->u64Base <= 0xffffffff);
223	pvFlat = (RTGCPTR)((pHiddenSel->u64Base + (RTGCUINTPTR)Addr) & 0xffffffff);
224	}
225
226	/*
227	* Check if present.
228	*/
229	if (u1Present)
230	{
231	/*
232	* Type check.
233	*/
234	switch (u4Type)
235	{
236
237	/** Read only selector type. */
238	case X86_SEL_TYPE_RO:
239	case X86_SEL_TYPE_RO_ACC:
240	case X86_SEL_TYPE_RW:
241	case X86_SEL_TYPE_RW_ACC:
242	case X86_SEL_TYPE_EO:
243	case X86_SEL_TYPE_EO_ACC:
244	case X86_SEL_TYPE_ER:
245	case X86_SEL_TYPE_ER_ACC:
246	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
247	{
248	/** @todo fix this mess */
249	}
250	/* check limit. */
251	if (fCheckLimit && (RTGCUINTPTR)Addr > u32Limit)
252	return VERR_OUT_OF_SELECTOR_BOUNDS;
253	/* ok */
254	if (ppvGC)
255	*ppvGC = pvFlat;
256	return VINF_SUCCESS;
257
258	case X86_SEL_TYPE_EO_CONF:
259	case X86_SEL_TYPE_EO_CONF_ACC:
260	case X86_SEL_TYPE_ER_CONF:
261	case X86_SEL_TYPE_ER_CONF_ACC:
262	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
263	{
264	/** @todo fix this mess */
265	}
266	/* check limit. */
267	if (fCheckLimit && (RTGCUINTPTR)Addr > u32Limit)
268	return VERR_OUT_OF_SELECTOR_BOUNDS;
269	/* ok */
270	if (ppvGC)
271	*ppvGC = pvFlat;
272	return VINF_SUCCESS;
273
274	case X86_SEL_TYPE_RO_DOWN:
275	case X86_SEL_TYPE_RO_DOWN_ACC:
276	case X86_SEL_TYPE_RW_DOWN:
277	case X86_SEL_TYPE_RW_DOWN_ACC:
278	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
279	{
280	/** @todo fix this mess */
281	}
282	/* check limit. */
283	if (fCheckLimit)
284	{
285	if (!u1Granularity && (RTGCUINTPTR)Addr > (RTGCUINTPTR)0xffff)
286	return VERR_OUT_OF_SELECTOR_BOUNDS;
287	if ((RTGCUINTPTR)Addr <= u32Limit)
288	return VERR_OUT_OF_SELECTOR_BOUNDS;
289	}
290	/* ok */
291	if (ppvGC)
292	*ppvGC = pvFlat;
293	return VINF_SUCCESS;
294
295	default:
296	return VERR_INVALID_SELECTOR;
297
298	}
299	}
300	}
301	# ifndef IN_RING0
302	else
303	# endif
304	#endif /* !IN_RC */
305	#ifndef IN_RING0
306	{
307	X86DESC Desc;
308
309	if (!(Sel & X86_SEL_LDT))
310	{
311	if ( !(fFlags & SELMTOFLAT_FLAGS_HYPER)
312	&& (unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.GuestGdtr.cbGdt)
313	return VERR_INVALID_SELECTOR;
314	Desc = pVM->selm.s.CTX_SUFF(paGdt)[Sel >> X86_SEL_SHIFT];
315	}
316	else
317	{
318	if ((unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.cbLdtLimit)
319	return VERR_INVALID_SELECTOR;
320
321	/** @todo handle LDT page(s) not present! */
322	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.CTX_SUFF(pvLdt) + pVM->selm.s.offLdtHyper);
323	Desc = paLDT[Sel >> X86_SEL_SHIFT];
324	}
325
326	/* calc limit. */
327	u32Limit = X86DESC_LIMIT(Desc);
328	if (Desc.Gen.u1Granularity)
329	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
330
331	/* calc address assuming straight stuff. */
332	pvFlat = (RTGCPTR)((RTGCUINTPTR)Addr + X86DESC_BASE(Desc));
333
334	/* Cut the address to 32 bits. */
335	Assert(!CPUMIsGuestInLongMode(pVCpu));
336	pvFlat &= 0xffffffff;
337
338	u1Present = Desc.Gen.u1Present;
339	u1Granularity = Desc.Gen.u1Granularity;
340	u1DescType = Desc.Gen.u1DescType;
341	u4Type = Desc.Gen.u4Type;
342
343	/*
344	* Check if present.
345	*/
346	if (u1Present)
347	{
348	/*
349	* Type check.
350	*/
351	# define BOTH(a, b) ((a << 16) \| b)
352	switch (BOTH(u1DescType, u4Type))
353	{
354
355	/** Read only selector type. */
356	case BOTH(1,X86_SEL_TYPE_RO):
357	case BOTH(1,X86_SEL_TYPE_RO_ACC):
358	case BOTH(1,X86_SEL_TYPE_RW):
359	case BOTH(1,X86_SEL_TYPE_RW_ACC):
360	case BOTH(1,X86_SEL_TYPE_EO):
361	case BOTH(1,X86_SEL_TYPE_EO_ACC):
362	case BOTH(1,X86_SEL_TYPE_ER):
363	case BOTH(1,X86_SEL_TYPE_ER_ACC):
364	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
365	{
366	/** @todo fix this mess */
367	}
368	/* check limit. */
369	if ((RTGCUINTPTR)Addr > u32Limit)
370	return VERR_OUT_OF_SELECTOR_BOUNDS;
371	/* ok */
372	if (ppvGC)
373	*ppvGC = pvFlat;
374	return VINF_SUCCESS;
375
376	case BOTH(1,X86_SEL_TYPE_EO_CONF):
377	case BOTH(1,X86_SEL_TYPE_EO_CONF_ACC):
378	case BOTH(1,X86_SEL_TYPE_ER_CONF):
379	case BOTH(1,X86_SEL_TYPE_ER_CONF_ACC):
380	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
381	{
382	/** @todo fix this mess */
383	}
384	/* check limit. */
385	if ((RTGCUINTPTR)Addr > u32Limit)
386	return VERR_OUT_OF_SELECTOR_BOUNDS;
387	/* ok */
388	if (ppvGC)
389	*ppvGC = pvFlat;
390	return VINF_SUCCESS;
391
392	case BOTH(1,X86_SEL_TYPE_RO_DOWN):
393	case BOTH(1,X86_SEL_TYPE_RO_DOWN_ACC):
394	case BOTH(1,X86_SEL_TYPE_RW_DOWN):
395	case BOTH(1,X86_SEL_TYPE_RW_DOWN_ACC):
396	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
397	{
398	/** @todo fix this mess */
399	}
400	/* check limit. */
401	if (!u1Granularity && (RTGCUINTPTR)Addr > (RTGCUINTPTR)0xffff)
402	return VERR_OUT_OF_SELECTOR_BOUNDS;
403	if ((RTGCUINTPTR)Addr <= u32Limit)
404	return VERR_OUT_OF_SELECTOR_BOUNDS;
405
406	/* ok */
407	if (ppvGC)
408	*ppvGC = pvFlat;
409	return VINF_SUCCESS;
410
411	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_AVAIL):
412	case BOTH(0,X86_SEL_TYPE_SYS_LDT):
413	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_BUSY):
414	case BOTH(0,X86_SEL_TYPE_SYS_286_CALL_GATE):
415	case BOTH(0,X86_SEL_TYPE_SYS_TASK_GATE):
416	case BOTH(0,X86_SEL_TYPE_SYS_286_INT_GATE):
417	case BOTH(0,X86_SEL_TYPE_SYS_286_TRAP_GATE):
418	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_AVAIL):
419	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_BUSY):
420	case BOTH(0,X86_SEL_TYPE_SYS_386_CALL_GATE):
421	case BOTH(0,X86_SEL_TYPE_SYS_386_INT_GATE):
422	case BOTH(0,X86_SEL_TYPE_SYS_386_TRAP_GATE):
423	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
424	{
425	/** @todo fix this mess */
426	}
427	/* check limit. */
428	if ((RTGCUINTPTR)Addr > u32Limit)
429	return VERR_OUT_OF_SELECTOR_BOUNDS;
430	/* ok */
431	if (ppvGC)
432	*ppvGC = pvFlat;
433	return VINF_SUCCESS;
434
435	default:
436	return VERR_INVALID_SELECTOR;
437
438	}
439	# undef BOTH
440	}
441	}
442	#endif /* !IN_RING0 */
443	return VERR_SELECTOR_NOT_PRESENT;
444	}
445
446
447	#ifndef IN_RING0
448	/**
449	* Converts a GC selector based address to a flat address.
450	*
451	* Some basic checking is done, but not all kinds yet.
452	*
453	* @returns VBox status
454	* @param pVM VM Handle.
455	* @param eflags Current eflags
456	* @param Sel Selector part.
457	* @param Addr Address part.
458	* @param pHiddenSel Hidden selector register (can be NULL)
459	* @param fFlags SELMTOFLAT_FLAGS_*
460	* GDT entires are valid.
461	* @param ppvGC Where to store the GC flat address.
462	* @param pcb Where to store the bytes from *ppvGC which can be accessed according to
463	* the selector. NULL is allowed.
464	* @remarks Don't use when in long mode.
465	*/
466	VMMDECL(int) SELMToFlatBySelEx(PVM pVM, X86EFLAGS eflags, RTSEL Sel, RTGCPTR Addr, CPUMSELREGHID pHiddenSel, unsigned fFlags, PRTGCPTR ppvGC, uint32_t pcb)
467	{
468	PVMCPU pVCpu = VMMGetCpu(pVM);
469
470	Assert(!CPUMIsGuestInLongMode(pVCpu)); /* DON'T USE! */
471
472	/*
473	* Deal with real & v86 mode first.
474	*/
475	if ( eflags.Bits.u1VM
476	\|\| CPUMIsGuestInRealMode(pVCpu))
477	{
478	RTGCUINTPTR uFlat = (RTGCUINTPTR)Addr & 0xffff;
479	if (ppvGC)
480	{
481	if ( pHiddenSel
482	&& CPUMAreHiddenSelRegsValid(pVM))
483	*ppvGC = (RTGCPTR)(pHiddenSel->u64Base + uFlat);
484	else
485	*ppvGC = (RTGCPTR)(((RTGCUINTPTR)Sel << 4) + uFlat);
486	}
487	if (pcb)
488	*pcb = 0x10000 - uFlat;
489	return VINF_SUCCESS;
490	}
491
492
493	uint32_t u32Limit;
494	RTGCPTR pvFlat;
495	uint32_t u1Present, u1DescType, u1Granularity, u4Type;
496
497	/** @todo when we're in 16 bits mode, we should cut off the address as well.. */
498	if ( pHiddenSel
499	&& CPUMAreHiddenSelRegsValid(pVM))
500	{
501	u1Present = pHiddenSel->Attr.n.u1Present;
502	u1Granularity = pHiddenSel->Attr.n.u1Granularity;
503	u1DescType = pHiddenSel->Attr.n.u1DescType;
504	u4Type = pHiddenSel->Attr.n.u4Type;
505
506	u32Limit = pHiddenSel->u32Limit;
507	pvFlat = (RTGCPTR)(pHiddenSel->u64Base + (RTGCUINTPTR)Addr);
508
509	if ( !pHiddenSel->Attr.n.u1Long
510	\|\| !CPUMIsGuestInLongMode(pVCpu))
511	{
512	/* AMD64 manual: compatibility mode ignores the high 32 bits when calculating an effective address. */
513	pvFlat &= 0xffffffff;
514	}
515	}
516	else
517	{
518	X86DESC Desc;
519
520	if (!(Sel & X86_SEL_LDT))
521	{
522	if ( !(fFlags & SELMTOFLAT_FLAGS_HYPER)
523	&& (unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.GuestGdtr.cbGdt)
524	return VERR_INVALID_SELECTOR;
525	Desc = pVM->selm.s.CTX_SUFF(paGdt)[Sel >> X86_SEL_SHIFT];
526	}
527	else
528	{
529	if ((unsigned)(Sel & X86_SEL_MASK) >= pVM->selm.s.cbLdtLimit)
530	return VERR_INVALID_SELECTOR;
531
532	/** @todo handle LDT page(s) not present! */
533	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.CTX_SUFF(pvLdt) + pVM->selm.s.offLdtHyper);
534	Desc = paLDT[Sel >> X86_SEL_SHIFT];
535	}
536
537	/* calc limit. */
538	u32Limit = X86DESC_LIMIT(Desc);
539	if (Desc.Gen.u1Granularity)
540	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
541
542	/* calc address assuming straight stuff. */
543	pvFlat = (RTGCPTR)((RTGCUINTPTR)Addr + X86DESC_BASE(Desc));
544
545	/* Cut the address to 32 bits. */
546	Assert(!CPUMIsGuestInLongMode(pVCpu));
547	pvFlat &= 0xffffffff;
548
549	u1Present = Desc.Gen.u1Present;
550	u1Granularity = Desc.Gen.u1Granularity;
551	u1DescType = Desc.Gen.u1DescType;
552	u4Type = Desc.Gen.u4Type;
553	}
554
555	/*
556	* Check if present.
557	*/
558	if (u1Present)
559	{
560	/*
561	* Type check.
562	*/
563	#define BOTH(a, b) ((a << 16) \| b)
564	switch (BOTH(u1DescType, u4Type))
565	{
566
567	/** Read only selector type. */
568	case BOTH(1,X86_SEL_TYPE_RO):
569	case BOTH(1,X86_SEL_TYPE_RO_ACC):
570	case BOTH(1,X86_SEL_TYPE_RW):
571	case BOTH(1,X86_SEL_TYPE_RW_ACC):
572	case BOTH(1,X86_SEL_TYPE_EO):
573	case BOTH(1,X86_SEL_TYPE_EO_ACC):
574	case BOTH(1,X86_SEL_TYPE_ER):
575	case BOTH(1,X86_SEL_TYPE_ER_ACC):
576	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
577	{
578	/** @todo fix this mess */
579	}
580	/* check limit. */
581	if ((RTGCUINTPTR)Addr > u32Limit)
582	return VERR_OUT_OF_SELECTOR_BOUNDS;
583	/* ok */
584	if (ppvGC)
585	*ppvGC = pvFlat;
586	if (pcb)
587	*pcb = u32Limit - (uint32_t)Addr + 1;
588	return VINF_SUCCESS;
589
590	case BOTH(1,X86_SEL_TYPE_EO_CONF):
591	case BOTH(1,X86_SEL_TYPE_EO_CONF_ACC):
592	case BOTH(1,X86_SEL_TYPE_ER_CONF):
593	case BOTH(1,X86_SEL_TYPE_ER_CONF_ACC):
594	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
595	{
596	/** @todo fix this mess */
597	}
598	/* check limit. */
599	if ((RTGCUINTPTR)Addr > u32Limit)
600	return VERR_OUT_OF_SELECTOR_BOUNDS;
601	/* ok */
602	if (ppvGC)
603	*ppvGC = pvFlat;
604	if (pcb)
605	*pcb = u32Limit - (uint32_t)Addr + 1;
606	return VINF_SUCCESS;
607
608	case BOTH(1,X86_SEL_TYPE_RO_DOWN):
609	case BOTH(1,X86_SEL_TYPE_RO_DOWN_ACC):
610	case BOTH(1,X86_SEL_TYPE_RW_DOWN):
611	case BOTH(1,X86_SEL_TYPE_RW_DOWN_ACC):
612	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
613	{
614	/** @todo fix this mess */
615	}
616	/* check limit. */
617	if (!u1Granularity && (RTGCUINTPTR)Addr > (RTGCUINTPTR)0xffff)
618	return VERR_OUT_OF_SELECTOR_BOUNDS;
619	if ((RTGCUINTPTR)Addr <= u32Limit)
620	return VERR_OUT_OF_SELECTOR_BOUNDS;
621
622	/* ok */
623	if (ppvGC)
624	*ppvGC = pvFlat;
625	if (pcb)
626	*pcb = (RTGCUINTPTR)(u1Granularity ? 0xffffffff : 0xffff) - (RTGCUINTPTR)Addr + 1;
627	return VINF_SUCCESS;
628
629	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_AVAIL):
630	case BOTH(0,X86_SEL_TYPE_SYS_LDT):
631	case BOTH(0,X86_SEL_TYPE_SYS_286_TSS_BUSY):
632	case BOTH(0,X86_SEL_TYPE_SYS_286_CALL_GATE):
633	case BOTH(0,X86_SEL_TYPE_SYS_TASK_GATE):
634	case BOTH(0,X86_SEL_TYPE_SYS_286_INT_GATE):
635	case BOTH(0,X86_SEL_TYPE_SYS_286_TRAP_GATE):
636	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_AVAIL):
637	case BOTH(0,X86_SEL_TYPE_SYS_386_TSS_BUSY):
638	case BOTH(0,X86_SEL_TYPE_SYS_386_CALL_GATE):
639	case BOTH(0,X86_SEL_TYPE_SYS_386_INT_GATE):
640	case BOTH(0,X86_SEL_TYPE_SYS_386_TRAP_GATE):
641	if (!(fFlags & SELMTOFLAT_FLAGS_NO_PL))
642	{
643	/** @todo fix this mess */
644	}
645	/* check limit. */
646	if ((RTGCUINTPTR)Addr > u32Limit)
647	return VERR_OUT_OF_SELECTOR_BOUNDS;
648	/* ok */
649	if (ppvGC)
650	*ppvGC = pvFlat;
651	if (pcb)
652	pcb = 0xffffffff - (RTGCUINTPTR)pvFlat + 1; / Depends on the type.. fixme if we care. */
653	return VINF_SUCCESS;
654
655	default:
656	return VERR_INVALID_SELECTOR;
657
658	}
659	#undef BOTH
660	}
661	return VERR_SELECTOR_NOT_PRESENT;
662	}
663	#endif /* !IN_RING0 */
664
665
666	/**
667	* Validates and converts a GC selector based code address to a flat
668	* address when in real or v8086 mode.
669	*
670	* @returns VINF_SUCCESS.
671	* @param pVM VM Handle.
672	* @param SelCS Selector part.
673	* @param pHidCS The hidden CS register part. Optional.
674	* @param Addr Address part.
675	* @param ppvFlat Where to store the flat address.
676	*/
677	DECLINLINE(int) selmValidateAndConvertCSAddrRealMode(PVM pVM, RTSEL SelCS, PCPUMSELREGHID pHidCS, RTGCPTR Addr, PRTGCPTR ppvFlat)
678	{
679	RTGCUINTPTR uFlat = (RTGCUINTPTR)Addr & 0xffff;
680	if (!pHidCS \|\| !CPUMAreHiddenSelRegsValid(pVM))
681	uFlat += ((RTGCUINTPTR)SelCS << 4);
682	else
683	uFlat += pHidCS->u64Base;
684	*ppvFlat = (RTGCPTR)uFlat;
685	return VINF_SUCCESS;
686	}
687
688
689	#ifndef IN_RING0
690	/**
691	* Validates and converts a GC selector based code address to a flat
692	* address when in protected/long mode using the standard algorithm.
693	*
694	* @returns VBox status code.
695	* @param pVM VM Handle.
696	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
697	* A full selector can be passed, we'll only use the RPL part.
698	* @param SelCS Selector part.
699	* @param Addr Address part.
700	* @param ppvFlat Where to store the flat address.
701	* @param pcBits Where to store the segment bitness (16/32/64). Optional.
702	*/
703	DECLINLINE(int) selmValidateAndConvertCSAddrStd(PVM pVM, RTSEL SelCPL, RTSEL SelCS, RTGCPTR Addr, PRTGCPTR ppvFlat, uint32_t *pcBits)
704	{
705	Assert(!CPUMAreHiddenSelRegsValid(pVM));
706
707	/** @todo validate limit! */
708	X86DESC Desc;
709	if (!(SelCS & X86_SEL_LDT))
710	Desc = pVM->selm.s.CTX_SUFF(paGdt)[SelCS >> X86_SEL_SHIFT];
711	else
712	{
713	/** @todo handle LDT page(s) not present! */
714	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.CTX_SUFF(pvLdt) + pVM->selm.s.offLdtHyper);
715	Desc = paLDT[SelCS >> X86_SEL_SHIFT];
716	}
717
718	/*
719	* Check if present.
720	*/
721	if (Desc.Gen.u1Present)
722	{
723	/*
724	* Type check.
725	*/
726	if ( Desc.Gen.u1DescType == 1
727	&& (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
728	{
729	/*
730	* Check level.
731	*/
732	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, SelCS & X86_SEL_RPL);
733	if ( !(Desc.Gen.u4Type & X86_SEL_TYPE_CONF)
734	? uLevel <= Desc.Gen.u2Dpl
735	: uLevel >= Desc.Gen.u2Dpl /* hope I got this right now... */
736	)
737	{
738	/*
739	* Limit check.
740	*/
741	uint32_t u32Limit = X86DESC_LIMIT(Desc);
742	if (Desc.Gen.u1Granularity)
743	u32Limit = (u32Limit << PAGE_SHIFT) \| PAGE_OFFSET_MASK;
744	if ((RTGCUINTPTR)Addr <= u32Limit)
745	{
746	*ppvFlat = (RTGCPTR)((RTGCUINTPTR)Addr + X86DESC_BASE(Desc));
747	/* Cut the address to 32 bits. */
748	*ppvFlat &= 0xffffffff;
749
750	if (pcBits)
751	pcBits = Desc.Gen.u1DefBig ? 32 : 16; /* @todo GUEST64 */
752	return VINF_SUCCESS;
753	}
754	return VERR_OUT_OF_SELECTOR_BOUNDS;
755	}
756	return VERR_INVALID_RPL;
757	}
758	return VERR_NOT_CODE_SELECTOR;
759	}
760	return VERR_SELECTOR_NOT_PRESENT;
761	}
762	#endif /* !IN_RING0 */
763
764
765	/**
766	* Validates and converts a GC selector based code address to a flat
767	* address when in protected/long mode using the standard algorithm.
768	*
769	* @returns VBox status code.
770	* @param pVCpu VMCPU Handle.
771	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
772	* A full selector can be passed, we'll only use the RPL part.
773	* @param SelCS Selector part.
774	* @param Addr Address part.
775	* @param ppvFlat Where to store the flat address.
776	*/
777	DECLINLINE(int) selmValidateAndConvertCSAddrHidden(PVMCPU pVCpu, RTSEL SelCPL, RTSEL SelCS, PCPUMSELREGHID pHidCS, RTGCPTR Addr, PRTGCPTR ppvFlat)
778	{
779	/*
780	* Check if present.
781	*/
782	if (pHidCS->Attr.n.u1Present)
783	{
784	/*
785	* Type check.
786	*/
787	if ( pHidCS->Attr.n.u1DescType == 1
788	&& (pHidCS->Attr.n.u4Type & X86_SEL_TYPE_CODE))
789	{
790	/*
791	* Check level.
792	*/
793	unsigned uLevel = RT_MAX(SelCPL & X86_SEL_RPL, SelCS & X86_SEL_RPL);
794	if ( !(pHidCS->Attr.n.u4Type & X86_SEL_TYPE_CONF)
795	? uLevel <= pHidCS->Attr.n.u2Dpl
796	: uLevel >= pHidCS->Attr.n.u2Dpl /* hope I got this right now... */
797	)
798	{
799	/* 64 bits mode: CS, DS, ES and SS are treated as if each segment base is 0 (Intel® 64 and IA-32 Architectures Software Developer's Manual: 3.4.2.1). */
800	if ( pHidCS->Attr.n.u1Long
801	&& CPUMIsGuestInLongMode(pVCpu))
802	{
803	*ppvFlat = Addr;
804	return VINF_SUCCESS;
805	}
806
807	/*
808	* Limit check. Note that the limit in the hidden register is the
809	* final value. The granularity bit was included in its calculation.
810	*/
811	uint32_t u32Limit = pHidCS->u32Limit;
812	if ((RTGCUINTPTR)Addr <= u32Limit)
813	{
814	*ppvFlat = (RTGCPTR)( (RTGCUINTPTR)Addr + pHidCS->u64Base );
815	return VINF_SUCCESS;
816	}
817	return VERR_OUT_OF_SELECTOR_BOUNDS;
818	}
819	Log(("Invalid RPL Attr.n.u4Type=%x cpl=%x dpl=%x\n", pHidCS->Attr.n.u4Type, uLevel, pHidCS->Attr.n.u2Dpl));
820	return VERR_INVALID_RPL;
821	}
822	return VERR_NOT_CODE_SELECTOR;
823	}
824	return VERR_SELECTOR_NOT_PRESENT;
825	}
826
827
828	#ifdef IN_RC
829	/**
830	* Validates and converts a GC selector based code address to a flat address.
831	*
832	* This is like SELMValidateAndConvertCSAddr + SELMIsSelector32Bit but with
833	* invalid hidden CS data. It's customized for dealing efficiently with CS
834	* at GC trap time.
835	*
836	* @returns VBox status code.
837	* @param pVM VM Handle.
838	* @param eflags Current eflags
839	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
840	* A full selector can be passed, we'll only use the RPL part.
841	* @param SelCS Selector part.
842	* @param Addr Address part.
843	* @param ppvFlat Where to store the flat address.
844	* @param pcBits Where to store the 64-bit/32-bit/16-bit indicator.
845	*/
846	VMMDECL(int) SELMValidateAndConvertCSAddrGCTrap(PVM pVM, X86EFLAGS eflags, RTSEL SelCPL, RTSEL SelCS, RTGCPTR Addr, PRTGCPTR ppvFlat, uint32_t *pcBits)
847	{
848	Assert(pVM->cCpus == 1);
849	PVMCPU pVCpu = &pVM->aCpus[0];
850
851	if ( eflags.Bits.u1VM
852	\|\| CPUMIsGuestInRealMode(pVCpu))
853	{
854	*pcBits = 16;
855	return selmValidateAndConvertCSAddrRealMode(pVM, SelCS, NULL, Addr, ppvFlat);
856	}
857	return selmValidateAndConvertCSAddrStd(pVM, SelCPL, SelCS, Addr, ppvFlat, pcBits);
858	}
859	#endif /* IN_RC */
860
861
862	/**
863	* Validates and converts a GC selector based code address to a flat address.
864	*
865	* @returns VBox status code.
866	* @param pVM VM Handle.
867	* @param eflags Current eflags
868	* @param SelCPL Current privilege level. Get this from SS - CS might be conforming!
869	* A full selector can be passed, we'll only use the RPL part.
870	* @param SelCS Selector part.
871	* @param pHiddenSel The hidden CS selector register.
872	* @param Addr Address part.
873	* @param ppvFlat Where to store the flat address.
874	*/
875	VMMDECL(int) SELMValidateAndConvertCSAddr(PVM pVM, X86EFLAGS eflags, RTSEL SelCPL, RTSEL SelCS, CPUMSELREGHID *pHiddenCSSel, RTGCPTR Addr, PRTGCPTR ppvFlat)
876	{
877	PVMCPU pVCpu = VMMGetCpu(pVM);
878
879	if ( eflags.Bits.u1VM
880	\|\| CPUMIsGuestInRealMode(pVCpu))
881	return selmValidateAndConvertCSAddrRealMode(pVM, SelCS, pHiddenCSSel, Addr, ppvFlat);
882
883	#ifdef IN_RING0
884	Assert(CPUMAreHiddenSelRegsValid(pVM));
885	#else
886	/** @todo when we're in 16 bits mode, we should cut off the address as well? (like in selmValidateAndConvertCSAddrRealMode) */
887	if (!CPUMAreHiddenSelRegsValid(pVM))
888	return selmValidateAndConvertCSAddrStd(pVM, SelCPL, SelCS, Addr, ppvFlat, NULL);
889	#endif
890	return selmValidateAndConvertCSAddrHidden(pVCpu, SelCPL, SelCS, pHiddenCSSel, Addr, ppvFlat);
891	}
892
893
894	#ifndef IN_RING0
895	/**
896	* Return the cpu mode corresponding to the (CS) selector
897	*
898	* @returns DISCPUMODE according to the selector type (16, 32 or 64 bits)
899	* @param pVM VM Handle.
900	* @param Sel The selector.
901	*/
902	static DISCPUMODE selmGetCpuModeFromSelector(PVM pVM, RTSEL Sel)
903	{
904	Assert(!CPUMAreHiddenSelRegsValid(pVM));
905
906	/** @todo validate limit! */
907	X86DESC Desc;
908	if (!(Sel & X86_SEL_LDT))
909	Desc = pVM->selm.s.CTX_SUFF(paGdt)[Sel >> X86_SEL_SHIFT];
910	else
911	{
912	/** @todo handle LDT page(s) not present! */
913	PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.CTX_SUFF(pvLdt) + pVM->selm.s.offLdtHyper);
914	Desc = paLDT[Sel >> X86_SEL_SHIFT];
915	}
916	return (Desc.Gen.u1DefBig) ? CPUMODE_32BIT : CPUMODE_16BIT;
917	}
918	#endif /* !IN_RING0 */
919
920
921	/**
922	* Return the cpu mode corresponding to the (CS) selector
923	*
924	* @returns DISCPUMODE according to the selector type (16, 32 or 64 bits)
925	* @param pVM VM Handle.
926	* @param eflags Current eflags register
927	* @param Sel The selector.
928	* @param pHiddenSel The hidden selector register.
929	*/
930	VMMDECL(DISCPUMODE) SELMGetCpuModeFromSelector(PVM pVM, X86EFLAGS eflags, RTSEL Sel, CPUMSELREGHID *pHiddenSel)
931	{
932	PVMCPU pVCpu = VMMGetCpu(pVM);
933	#ifdef IN_RING0
934	Assert(CPUMAreHiddenSelRegsValid(pVM));
935	#else /* !IN_RING0 */
936	if (!CPUMAreHiddenSelRegsValid(pVM))
937	{
938	/*
939	* Deal with real & v86 mode first.
940	*/
941	if ( eflags.Bits.u1VM
942	\|\| CPUMIsGuestInRealMode(pVCpu))
943	return CPUMODE_16BIT;
944
945	return selmGetCpuModeFromSelector(pVM, Sel);
946	}
947	#endif /* !IN_RING0 */
948	if ( pHiddenSel->Attr.n.u1Long
949	&& CPUMIsGuestInLongMode(pVCpu))
950	return CPUMODE_64BIT;
951
952	/* Else compatibility or 32 bits mode. */
953	return (pHiddenSel->Attr.n.u1DefBig) ? CPUMODE_32BIT : CPUMODE_16BIT;
954	}
955
956
957	/**
958	* Returns Hypervisor's Trap 08 (\#DF) selector.
959	*
960	* @returns Hypervisor's Trap 08 (\#DF) selector.
961	* @param pVM VM Handle.
962	*/
963	VMMDECL(RTSEL) SELMGetTrap8Selector(PVM pVM)
964	{
965	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
966	}
967
968
969	/**
970	* Sets EIP of Hypervisor's Trap 08 (\#DF) TSS.
971	*
972	* @param pVM VM Handle.
973	* @param u32EIP EIP of Trap 08 handler.
974	*/
975	VMMDECL(void) SELMSetTrap8EIP(PVM pVM, uint32_t u32EIP)
976	{
977	pVM->selm.s.TssTrap08.eip = u32EIP;
978	}
979
980
981	/**
982	* Sets ss:esp for ring1 in main Hypervisor's TSS.
983	*
984	* @param pVM VM Handle.
985	* @param ss Ring1 SS register value. Pass 0 if invalid.
986	* @param esp Ring1 ESP register value.
987	*/
988	void selmSetRing1Stack(PVM pVM, uint32_t ss, RTGCPTR32 esp)
989	{
990	Assert((ss & 1) \|\| esp == 0);
991	pVM->selm.s.Tss.ss1 = ss;
992	pVM->selm.s.Tss.esp1 = (uint32_t)esp;
993	}
994
995
996	#ifndef IN_RING0
997	/**
998	* Gets ss:esp for ring1 in main Hypervisor's TSS.
999	*
1000	* Returns SS=0 if the ring-1 stack isn't valid.
1001	*
1002	* @returns VBox status code.
1003	* @param pVM VM Handle.
1004	* @param pSS Ring1 SS register value.
1005	* @param pEsp Ring1 ESP register value.
1006	*/
1007	VMMDECL(int) SELMGetRing1Stack(PVM pVM, uint32_t *pSS, PRTGCPTR32 pEsp)
1008	{
1009	Assert(pVM->cCpus == 1);
1010	PVMCPU pVCpu = &pVM->aCpus[0];
1011
1012	if (pVM->selm.s.fSyncTSSRing0Stack)
1013	{
1014	RTGCPTR GCPtrTss = pVM->selm.s.GCPtrGuestTss;
1015	int rc;
1016	VBOXTSS tss;
1017
1018	Assert(pVM->selm.s.GCPtrGuestTss && pVM->selm.s.cbMonitoredGuestTss);
1019
1020	# ifdef IN_RC
1021	bool fTriedAlready = false;
1022
1023	l_tryagain:
1024	PVBOXTSS pTss = (PVBOXTSS)(uintptr_t)GCPtrTss;
1025	rc = MMGCRamRead(pVM, &tss.ss0, &pTss->ss0, sizeof(tss.ss0));
1026	rc \|= MMGCRamRead(pVM, &tss.esp0, &pTss->esp0, sizeof(tss.esp0));
1027	# ifdef DEBUG
1028	rc \|= MMGCRamRead(pVM, &tss.offIoBitmap, &pTss->offIoBitmap, sizeof(tss.offIoBitmap));
1029	# endif
1030
1031	if (RT_FAILURE(rc))
1032	{
1033	if (!fTriedAlready)
1034	{
1035	/* Shadow page might be out of sync. Sync and try again */
1036	/** @todo might cross page boundary */
1037	fTriedAlready = true;
1038	rc = PGMPrefetchPage(pVCpu, (RTGCPTR)GCPtrTss);
1039	if (rc != VINF_SUCCESS)
1040	return rc;
1041	goto l_tryagain;
1042	}
1043	AssertMsgFailed(("Unable to read TSS structure at %08X\n", GCPtrTss));
1044	return rc;
1045	}
1046
1047	# else /* !IN_RC */
1048	/* Reading too much. Could be cheaper than two seperate calls though. */
1049	rc = PGMPhysSimpleReadGCPtr(pVCpu, &tss, GCPtrTss, sizeof(VBOXTSS));
1050	if (RT_FAILURE(rc))
1051	{
1052	AssertReleaseMsgFailed(("Unable to read TSS structure at %08X\n", GCPtrTss));
1053	return rc;
1054	}
1055	# endif /* !IN_RC */
1056
1057	# ifdef LOG_ENABLED
1058	uint32_t ssr0 = pVM->selm.s.Tss.ss1;
1059	uint32_t espr0 = pVM->selm.s.Tss.esp1;
1060	ssr0 &= ~1;
1061
1062	if (ssr0 != tss.ss0 \|\| espr0 != tss.esp0)
1063	Log(("SELMGetRing1Stack: Updating TSS ring 0 stack to %04X:%08X\n", tss.ss0, tss.esp0));
1064
1065	Log(("offIoBitmap=%#x\n", tss.offIoBitmap));
1066	# endif
1067	/* Update our TSS structure for the guest's ring 1 stack */
1068	selmSetRing1Stack(pVM, tss.ss0 \| 1, (RTGCPTR32)tss.esp0);
1069	pVM->selm.s.fSyncTSSRing0Stack = false;
1070	}
1071
1072	*pSS = pVM->selm.s.Tss.ss1;
1073	*pEsp = (RTGCPTR32)pVM->selm.s.Tss.esp1;
1074
1075	return VINF_SUCCESS;
1076	}
1077	#endif /* !IN_RING0 */
1078
1079
1080	/**
1081	* Returns Guest TSS pointer
1082	*
1083	* @returns Pointer to the guest TSS, RTRCPTR_MAX if not being monitored.
1084	* @param pVM VM Handle.
1085	*/
1086	VMMDECL(RTGCPTR) SELMGetGuestTSS(PVM pVM)
1087	{
1088	return (RTGCPTR)pVM->selm.s.GCPtrGuestTss;
1089	}
1090
1091
1092	#ifndef IN_RING0
1093
1094	/**
1095	* Gets the hypervisor code selector (CS).
1096	* @returns CS selector.
1097	* @param pVM The VM handle.
1098	*/
1099	VMMDECL(RTSEL) SELMGetHyperCS(PVM pVM)
1100	{
1101	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
1102	}
1103
1104
1105	/**
1106	* Gets the 64-mode hypervisor code selector (CS64).
1107	* @returns CS selector.
1108	* @param pVM The VM handle.
1109	*/
1110	VMMDECL(RTSEL) SELMGetHyperCS64(PVM pVM)
1111	{
1112	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64];
1113	}
1114
1115
1116	/**
1117	* Gets the hypervisor data selector (DS).
1118	* @returns DS selector.
1119	* @param pVM The VM handle.
1120	*/
1121	VMMDECL(RTSEL) SELMGetHyperDS(PVM pVM)
1122	{
1123	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
1124	}
1125
1126
1127	/**
1128	* Gets the hypervisor TSS selector.
1129	* @returns TSS selector.
1130	* @param pVM The VM handle.
1131	*/
1132	VMMDECL(RTSEL) SELMGetHyperTSS(PVM pVM)
1133	{
1134	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS];
1135	}
1136
1137
1138	/**
1139	* Gets the hypervisor TSS Trap 8 selector.
1140	* @returns TSS Trap 8 selector.
1141	* @param pVM The VM handle.
1142	*/
1143	VMMDECL(RTSEL) SELMGetHyperTSSTrap08(PVM pVM)
1144	{
1145	return pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
1146	}
1147
1148	/**
1149	* Gets the address for the hypervisor GDT.
1150	*
1151	* @returns The GDT address.
1152	* @param pVM The VM handle.
1153	* @remark This is intended only for very special use, like in the world
1154	* switchers. Don't exploit this API!
1155	*/
1156	VMMDECL(RTRCPTR) SELMGetHyperGDT(PVM pVM)
1157	{
1158	/*
1159	* Always convert this from the HC pointer since we can be
1160	* called before the first relocation and have to work correctly
1161	* without having dependencies on the relocation order.
1162	*/
1163	return (RTRCPTR)MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3);
1164	}
1165
1166	#endif /* !IN_RING0 */
1167
1168	/**
1169	* Gets info about the current TSS.
1170	*
1171	* @returns VBox status code.
1172	* @retval VINF_SUCCESS if we've got a TSS loaded.
1173	* @retval VERR_SELM_NO_TSS if we haven't got a TSS (rather unlikely).
1174	*
1175	* @param pVM The VM handle.
1176	* @param pVCpu VMCPU Handle.
1177	* @param pGCPtrTss Where to store the TSS address.
1178	* @param pcbTss Where to store the TSS size limit.
1179	* @param pfCanHaveIOBitmap Where to store the can-have-I/O-bitmap indicator. (optional)
1180	*/
1181	VMMDECL(int) SELMGetTSSInfo(PVM pVM, PVMCPU pVCpu, PRTGCUINTPTR pGCPtrTss, PRTGCUINTPTR pcbTss, bool *pfCanHaveIOBitmap)
1182	{
1183	/*
1184	* The TR hidden register is always valid.
1185	*/
1186	CPUMSELREGHID trHid;
1187	RTSEL tr = CPUMGetGuestTR(pVCpu, &trHid);
1188	if (!(tr & X86_SEL_MASK))
1189	return VERR_SELM_NO_TSS;
1190
1191	*pGCPtrTss = trHid.u64Base;
1192	pcbTss = trHid.u32Limit + (trHid.u32Limit != UINT32_MAX); / be careful. */
1193	if (pfCanHaveIOBitmap)
1194	*pfCanHaveIOBitmap = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
1195	\|\| trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
1196	return VINF_SUCCESS;
1197	}
1198
1199
1200
1201	/**
1202	* Notification callback which is called whenever there is a chance that a CR3
1203	* value might have changed.
1204	* This is called by PGM.
1205	*
1206	* @param pVM The VM handle
1207	* @param pVCpu The VMCPU handle
1208	*/
1209	VMMDECL(void) SELMShadowCR3Changed(PVM pVM, PVMCPU pVCpu)
1210	{
1211	/** @todo SMP support!! */
1212	pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
1213	pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu);
1214	}

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source: vbox/trunk/src/VBox/VMM/VMMAll/SELMAll.cpp@ 28112

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