MMPhys.cpp@ 4388

Last change on this file since 4388 was 4388, checked in by vboxsync, 17 years ago
Shadow ROM emulation. Clear the RESERVED flag for ROM.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 21.1 KB

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1	/* $Id: MMPhys.cpp 4388 2007-08-27 14:26:05Z vboxsync $ */
2	/** @file
3	* MM - Memory Monitor(/Manager) - Physical Memory.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18
19	/*******************************************************************************
20	* Header Files *
21	*******************************************************************************/
22	#define LOG_GROUP LOG_GROUP_MM_PHYS
23	#include <VBox/mm.h>
24	#include <VBox/pgm.h>
25	#include <VBox/rem.h>
26	#include "MMInternal.h"
27	#include <VBox/vm.h>
28
29	#include <VBox/log.h>
30	#include <VBox/param.h>
31	#include <VBox/err.h>
32	#include <iprt/alloc.h>
33	#include <iprt/assert.h>
34	#include <iprt/string.h>
35
36
37	/**
38	* Register externally allocated RAM for the virtual machine.
39	*
40	* The memory registered with the VM thru this interface must not be freed
41	* before the virtual machine has been destroyed. Bad things may happen... :-)
42	*
43	* @return VBox status code.
44	* @param pVM VM handle.
45	* @param pvRam Virtual address of the guest's physical memory range Must be page aligned.
46	* @param GCPhys The physical address the ram shall be registered at.
47	* @param cb Size of the memory. Must be page aligend.
48	* @param fFlags Flags of the MM_RAM_FLAGS_* defines.
49	* @param pszDesc Description of the memory.
50	*/
51	MMR3DECL(int) MMR3PhysRegister(PVM pVM, void pvRam, RTGCPHYS GCPhys, unsigned cb, unsigned fFlags, const char pszDesc)
52	{
53	return MMR3PhysRegisterEx(pVM, pvRam, GCPhys, cb, fFlags, MM_PHYS_TYPE_NORMAL, pszDesc);
54	}
55
56
57	/**
58	* Register externally allocated RAM for the virtual machine.
59	*
60	* The memory registered with the VM thru this interface must not be freed
61	* before the virtual machine has been destroyed. Bad things may happen... :-)
62	*
63	* @return VBox status code.
64	* @param pVM VM handle.
65	* @param pvRam Virtual address of the guest's physical memory range Must be page aligned.
66	* @param GCPhys The physical address the ram shall be registered at.
67	* @param cb Size of the memory. Must be page aligend.
68	* @param fFlags Flags of the MM_RAM_FLAGS_* defines.
69	* @param enmType Physical range type (MM_PHYS_TYPE_*)
70	* @param pszDesc Description of the memory.
71	* @thread The Emulation Thread.
72	*/
73	/** @todo this function description is not longer up-to-date */
74	MMR3DECL(int) MMR3PhysRegisterEx(PVM pVM, void pvRam, RTGCPHYS GCPhys, unsigned cb, unsigned fFlags, MMPHYSREG enmType, const char pszDesc)
75	{
76	int rc = VINF_SUCCESS;
77
78	Log(("MMR3PhysRegister: pvRam=%p GCPhys=%VGp cb=%#x fFlags=%#x\n", pvRam, GCPhys, cb, fFlags));
79
80	/*
81	* Validate input.
82	*/
83	AssertMsg(pVM, ("Invalid VM pointer\n"));
84	if (pvRam)
85	AssertReturn(ALIGNP(pvRam, PAGE_SIZE) == pvRam, VERR_INVALID_PARAMETER);
86	else
87	AssertReturn(fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC, VERR_INVALID_PARAMETER);
88	AssertReturn(RT_ALIGN_T(GCPhys, PAGE_SIZE, RTGCPHYS) == GCPhys, VERR_INVALID_PARAMETER);
89	AssertReturn(RT_ALIGN_Z(cb, PAGE_SIZE) == cb, VERR_INVALID_PARAMETER);
90	AssertReturn(enmType == MM_PHYS_TYPE_NORMAL \|\| enmType == MM_PHYS_TYPE_DYNALLOC_CHUNK, VERR_INVALID_PARAMETER);
91	RTGCPHYS GCPhysLast = GCPhys + (cb - 1);
92	AssertReturn(GCPhysLast > GCPhys, VERR_INVALID_PARAMETER);
93
94
95	/*
96	* Check for conflicts.
97	*
98	* We do not support overlapping physical memory regions yet,
99	* even if that's what the MM_RAM_FLAGS_MMIO2 flags is trying to
100	* tell us to do. Provided that all MMIO2 addresses are very high
101	* there is no real danger we'll be able to assign so much memory
102	* for a guest that it'll ever be a problem.
103	*/
104	AssertMsg(!(fFlags & MM_RAM_FLAGS_MMIO2) \|\| GCPhys > 0xc0000000,
105	("MMIO2 addresses should be above 3GB for avoiding conflicts with real RAM.\n"));
106	PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem;
107	while (pCur)
108	{
109	if ( pCur->eType == MM_LOCKED_TYPE_PHYS
110	&& ( GCPhys - pCur->u.phys.GCPhys < pCur->cb
111	\|\| pCur->u.phys.GCPhys - GCPhys < cb)
112	)
113	{
114	AssertMsgFailed(("Conflicting RAM range. Existing %#x LB%#x, Req %#x LB%#x\n",
115	pCur->u.phys.GCPhys, pCur->cb, GCPhys, cb));
116	return VERR_MM_RAM_CONFLICT;
117	}
118
119	/* next */
120	pCur = pCur->pNext;
121	}
122
123
124	/* Dynamic/on-demand allocation of backing memory? */
125	if (fFlags & MM_RAM_FLAGS_DYNAMIC_ALLOC)
126	{
127	/*
128	* Register the ram with PGM.
129	*/
130	rc = PGMR3PhysRegister(pVM, pvRam, GCPhys, cb, fFlags, NULL, pszDesc);
131	if (VBOX_SUCCESS(rc))
132	{
133	if (fFlags == MM_RAM_FLAGS_DYNAMIC_ALLOC)
134	pVM->mm.s.cbRAMSize += cb;
135
136	REMR3NotifyPhysRamRegister(pVM, GCPhys, cb, pvRam, fFlags);
137	return rc;
138	}
139	}
140	else
141	{
142	/*
143	* Lock the memory. (fully allocated by caller)
144	*/
145	PMMLOCKEDMEM pLockedMem;
146	rc = mmr3LockMem(pVM, pvRam, cb, MM_LOCKED_TYPE_PHYS, &pLockedMem, enmType == MM_PHYS_TYPE_DYNALLOC_CHUNK /* fSilentFailure */);
147	if (VBOX_SUCCESS(rc))
148	{
149	pLockedMem->u.phys.GCPhys = GCPhys;
150
151	/*
152	* We set any page flags specified.
153	*/
154	if (fFlags)
155	for (unsigned i = 0; i < cb >> PAGE_SHIFT; i++)
156	pLockedMem->aPhysPages[i].Phys \|= fFlags;
157
158	/*
159	* Register the ram with PGM.
160	*/
161	if (enmType == MM_PHYS_TYPE_NORMAL)
162	{
163	rc = PGMR3PhysRegister(pVM, pvRam, pLockedMem->u.phys.GCPhys, cb, fFlags, &pLockedMem->aPhysPages[0], pszDesc);
164	if (VBOX_SUCCESS(rc))
165	{
166	if (!fFlags)
167	pVM->mm.s.cbRAMSize += cb;
168
169	REMR3NotifyPhysRamRegister(pVM, GCPhys, cb, pvRam, fFlags);
170	return rc;
171	}
172	}
173	else
174	{
175	Assert(enmType == MM_PHYS_TYPE_DYNALLOC_CHUNK);
176	return PGMR3PhysRegisterChunk(pVM, pvRam, pLockedMem->u.phys.GCPhys, cb, fFlags, &pLockedMem->aPhysPages[0], pszDesc);
177	}
178	}
179	/* Cleanup is done in VM destruction to which failure of this function will lead. */
180	/* Not true in case of MM_PHYS_TYPE_DYNALLOC_CHUNK */
181	}
182
183	return rc;
184	}
185
186
187	/**
188	* Relocate previously registered externally allocated RAM for the virtual machine.
189	*
190	* Use this only for MMIO ranges or the guest will become very confused.
191	* The memory registered with the VM thru this interface must not be freed
192	* before the virtual machine has been destroyed. Bad things may happen... :-)
193	*
194	* @return VBox status code.
195	* @param pVM VM handle.
196	* @param GCPhysOld The physical address the ram was registered at.
197	* @param GCPhysNew The physical address the ram shall be registered at.
198	* @param cb Size of the memory. Must be page aligend.
199	*/
200	MMR3DECL(int) MMR3PhysRelocate(PVM pVM, RTGCPHYS GCPhysOld, RTGCPHYS GCPhysNew, unsigned cb)
201	{
202	Log(("MMR3PhysRelocate: GCPhysOld=%VGp GCPhysNew=%VGp cb=%#x\n", GCPhysOld, GCPhysNew, cb));
203
204	/*
205	* Validate input.
206	*/
207	AssertMsg(pVM, ("Invalid VM pointer\n"));
208	AssertReturn(RT_ALIGN_T(GCPhysOld, PAGE_SIZE, RTGCPHYS) == GCPhysOld, VERR_INVALID_PARAMETER);
209	AssertReturn(RT_ALIGN_T(GCPhysNew, PAGE_SIZE, RTGCPHYS) == GCPhysNew, VERR_INVALID_PARAMETER);
210	AssertReturn(RT_ALIGN(cb, PAGE_SIZE) == cb, VERR_INVALID_PARAMETER);
211	RTGCPHYS GCPhysLast;
212	GCPhysLast = GCPhysOld + (cb - 1);
213	AssertReturn(GCPhysLast > GCPhysOld, VERR_INVALID_PARAMETER);
214	GCPhysLast = GCPhysNew + (cb - 1);
215	AssertReturn(GCPhysLast > GCPhysNew, VERR_INVALID_PARAMETER);
216
217	/*
218	* Find the old memory region.
219	*/
220	PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem;
221	while (pCur)
222	{
223	if ( pCur->eType == MM_LOCKED_TYPE_PHYS
224	&& GCPhysOld == pCur->u.phys.GCPhys
225	&& cb == pCur->cb)
226	break;
227
228	/* next */
229	pCur = pCur->pNext;
230	}
231	if (!pCur)
232	{
233	AssertMsgFailed(("Unknown old region! %VGp LB%#x\n", GCPhysOld, cb));
234	return VERR_INVALID_PARAMETER;
235	}
236
237	/*
238	* Region is already locked, just need to change GC address.
239	*/
240	/** @todo r=bird: check for conflicts? */
241	pCur->u.phys.GCPhys = GCPhysNew;
242
243	/*
244	* Relocate the registered RAM range with PGM.
245	*/
246	int rc = PGMR3PhysRelocate(pVM, GCPhysOld, GCPhysNew, cb);
247	if (VBOX_SUCCESS(rc))
248	{
249	/* Somewhat hackish way to relocate the region with REM. There
250	* is unfortunately no official way to unregister anything with
251	* REM, as there is no way to unregister memory with QEMU.
252	* This implementation seems to work, but is not very pretty. */
253	/// @todo one day provide a proper MMIO relocation operation
254	REMR3NotifyPhysReserve(pVM, GCPhysOld, cb);
255	REMR3NotifyPhysRamRegister(pVM, GCPhysNew, cb, pCur->pv,
256	pCur->aPhysPages[0].Phys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2));
257	}
258
259	return rc;
260	}
261
262
263	/**
264	* Register a ROM (BIOS) region.
265	*
266	* It goes without saying that this is read-only memory. The memory region must be
267	* in unassigned memory. I.e. from the top of the address space or on the PC in
268	* the 0xa0000-0xfffff range.
269	*
270	* @returns VBox status.
271	* @param pVM VM Handle.
272	* @param pDevIns The device instance owning the ROM region.
273	* @param GCPhys First physical address in the range.
274	* Must be page aligned!
275	* @param cbRange The size of the range (in bytes).
276	* Must be page aligned!
277	* @param pvBinary Pointer to the binary data backing the ROM image.
278	* This must be cbRange bytes big.
279	* It will be copied and doesn't have to stick around.
280	* It will be copied and doesn't have to stick around if fShadow is clear.
281	* @param fShadow Whether to emulate ROM shadowing. This involves leaving
282	* the ROM writable for a while during the POST and refreshing
283	* it at reset. When this flag is set, the memory pointed to by
284	* pvBinary has to stick around for the lifespan of the VM.
285	* @param pszDesc Pointer to description string. This must not be freed.
286	* @remark There is no way to remove the rom, automatically on device cleanup or
287	* manually from the device yet. At present I doubt we need such features...
288	*/
289	MMR3DECL(int) MMR3PhysRomRegister(PVM pVM, PPDMDEVINS pDevIns, RTGCPHYS GCPhys, RTUINT cbRange, const void *pvBinary,
290	bool fShadow, const char *pszDesc)
291	{
292	/*
293	* Validate input.
294	*/
295	AssertPtrReturn(pDevIns, VERR_INVALID_PARAMETER);
296	AssertReturn(RT_ALIGN_T(GCPhys, PAGE_SIZE, RTGCPHYS) == GCPhys, VERR_INVALID_PARAMETER);
297	AssertReturn(RT_ALIGN(cbRange, PAGE_SIZE) == cbRange, VERR_INVALID_PARAMETER);
298	RTGCPHYS GCPhysLast = GCPhys + (cbRange - 1);
299	AssertReturn(GCPhysLast > GCPhys, VERR_INVALID_PARAMETER);
300	AssertPtrReturn(pvBinary, VERR_INVALID_PARAMETER);
301
302
303	/*
304	* Check if this can fit in an existing range.
305	*
306	* We do not handle the case where a new chunk of locked memory is
307	* required to accommodate the ROM since we assume MMR3PhysReserve()
308	* have been called to reserve the memory first.
309	*
310	* To make things even simpler, the pages in question must be
311	* marked as reserved.
312	*/
313	PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem;
314	for ( ; pCur; pCur = pCur->pNext)
315	if ( pCur->eType == MM_LOCKED_TYPE_PHYS
316	&& GCPhys - pCur->u.phys.GCPhys < pCur->cb)
317	break;
318	if (!pCur)
319	{
320	AssertMsgFailed(("No physical range was found matching the ROM location (%#VGp LB%#x)\n", GCPhys, cbRange));
321	return VERR_INVALID_PARAMETER;
322	}
323	if (GCPhysLast - pCur->u.phys.GCPhys >= pCur->cb)
324	{
325	AssertMsgFailed(("The ROM range (%#VGp LB%#x) was crossing the end of the physical range (%#VGp LB%#x)\n",
326	GCPhys, cbRange, pCur->u.phys.GCPhys, pCur->cb));
327	return VERR_INVALID_PARAMETER;
328	}
329
330	/* flags must be all reserved. */
331	unsigned iPage = (GCPhys - pCur->u.phys.GCPhys) >> PAGE_SHIFT;
332	unsigned iPageEnd = cbRange >> PAGE_SHIFT;
333	for (; iPage < iPageEnd; iPage++)
334	if ( (pCur->aPhysPages[iPage].Phys & (MM_RAM_FLAGS_RESERVED \| MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO \| MM_RAM_FLAGS_MMIO2))
335	!= MM_RAM_FLAGS_RESERVED)
336	{
337	AssertMsgFailed(("Flags conflict at %VGp, HCPhys=%VHp.\n", pCur->u.phys.GCPhys + (iPage << PAGE_SHIFT), pCur->aPhysPages[iPage].Phys));
338	return VERR_INVALID_PARAMETER;
339	}
340
341	/*
342	* Copy the ram and update the flags.
343	*/
344	iPage = (GCPhys - pCur->u.phys.GCPhys) >> PAGE_SHIFT;
345	void pvCopy = (char )pCur->pv + (iPage << PAGE_SHIFT);
346	memcpy(pvCopy, pvBinary, cbRange);
347
348	const unsigned fSet = fShadow ? MM_RAM_FLAGS_ROM \| MM_RAM_FLAGS_MMIO2 : MM_RAM_FLAGS_ROM;
349	for (; iPage < iPageEnd; iPage++)
350	{
351	pCur->aPhysPages[iPage].Phys &= ~MM_RAM_FLAGS_RESERVED;
352	pCur->aPhysPages[iPage].Phys \|= fSet;
353	}
354	int rc = PGMR3PhysSetFlags(pVM, GCPhys, cbRange, fSet, ~MM_RAM_FLAGS_RESERVED);
355	AssertRC(rc);
356	if (VBOX_SUCCESS(rc))
357	{
358	/*
359	* To prevent the shadow page table mappings from being RW in raw-mode, we
360	* must currently employ a little hack. We register an write access handler
361	* and thereby ensures a RO mapping of the pages. This is NOT very nice,
362	* and wasn't really my intention when writing the code, consider it a PGM bug.
363	*
364	* ASSUMES that REMR3NotifyPhysRomRegister doesn't call cpu_register_physical_memory
365	* when there is no HC handler. The result would probably be immediate boot failure.
366	*/
367	rc = PGMR3HandlerPhysicalRegister(pVM, PGMPHYSHANDLERTYPE_PHYSICAL_WRITE, GCPhys, GCPhys + cbRange - 1,
368	NULL, NULL,
369	NULL, "pgmGuestROMWriteHandler", 0,
370	NULL, "pgmGuestROMWriteHandler", 0, pszDesc);
371	AssertRC(rc);
372	}
373
374	/*
375	* Create a ROM range it so we can make a 'info rom' thingy and more importantly
376	* reload and protect/unprotect shadow ROM correctly.
377	*/
378	if (VBOX_SUCCESS(rc))
379	{
380	PMMROMRANGE pRomRange = (PMMROMRANGE)MMR3HeapAlloc(pVM, MM_TAG_MM, sizeof(*pRomRange));
381	AssertReturn(pRomRange, VERR_NO_MEMORY);
382	pRomRange->GCPhys = GCPhys;
383	pRomRange->cbRange = cbRange;
384	pRomRange->pszDesc = pszDesc;
385	pRomRange->fShadow = fShadow;
386	pRomRange->fWritable = fShadow;
387	pRomRange->pvBinary = fShadow ? pvBinary : NULL;
388	pRomRange->pvCopy = pvCopy;
389
390	/* sort it for 'info rom' readability. */
391	PMMROMRANGE pPrev = NULL;
392	PMMROMRANGE pCur = pVM->mm.s.pRomHead;
393	while (pCur && pCur->GCPhys < GCPhys)
394	{
395	pPrev = pCur;
396	pCur = pCur->pNext;
397	}
398	pRomRange->pNext = pCur;
399	if (pPrev)
400	pPrev->pNext = pRomRange;
401	else
402	pVM->mm.s.pRomHead = pRomRange;
403	}
404
405	REMR3NotifyPhysRomRegister(pVM, GCPhys, cbRange, pvCopy, fShadow);
406	return rc; /* we're sloppy with error cleanup here, but we're toast anyway if this fails. */
407	}
408
409
410	/**
411	* Reserve physical address space for ROM and MMIO ranges.
412	*
413	* @returns VBox status code.
414	* @param pVM VM Handle.
415	* @param GCPhys Start physical address.
416	* @param cbRange The size of the range.
417	* @param pszDesc Description string.
418	*/
419	MMR3DECL(int) MMR3PhysReserve(PVM pVM, RTGCPHYS GCPhys, RTUINT cbRange, const char *pszDesc)
420	{
421	/*
422	* Validate input.
423	*/
424	AssertReturn(RT_ALIGN_T(GCPhys, PAGE_SIZE, RTGCPHYS) == GCPhys, VERR_INVALID_PARAMETER);
425	AssertReturn(RT_ALIGN(cbRange, PAGE_SIZE) == cbRange, VERR_INVALID_PARAMETER);
426	RTGCPHYS GCPhysLast = GCPhys + (cbRange - 1);
427	AssertReturn(GCPhysLast > GCPhys, VERR_INVALID_PARAMETER);
428
429	/*
430	* Do we have an existing physical address range for the request?
431	*/
432	PMMLOCKEDMEM pCur = pVM->mm.s.pLockedMem;
433	for ( ; pCur; pCur = pCur->pNext)
434	if ( pCur->eType == MM_LOCKED_TYPE_PHYS
435	&& GCPhys - pCur->u.phys.GCPhys < pCur->cb)
436	break;
437	if (!pCur)
438	{
439	/*
440	* No range, we'll just allocate backing pages and register
441	* them as reserved using the Ram interface.
442	*/
443	void *pvPages;
444	int rc = SUPPageAlloc(cbRange >> PAGE_SHIFT, &pvPages);
445	if (VBOX_SUCCESS(rc))
446	{
447	rc = MMR3PhysRegister(pVM, pvPages, GCPhys, cbRange, MM_RAM_FLAGS_RESERVED, pszDesc);
448	if (VBOX_FAILURE(rc))
449	SUPPageFree(pvPages, cbRange >> PAGE_SHIFT);
450	}
451	return rc;
452	}
453	if (GCPhysLast - pCur->u.phys.GCPhys >= pCur->cb)
454	{
455	AssertMsgFailed(("The reserved range (%#VGp LB%#x) was crossing the end of the physical range (%#VGp LB%#x)\n",
456	GCPhys, cbRange, pCur->u.phys.GCPhys, pCur->cb));
457	return VERR_INVALID_PARAMETER;
458	}
459
460	/*
461	* Update the flags.
462	*/
463	unsigned iPage = (GCPhys - pCur->u.phys.GCPhys) >> PAGE_SHIFT;
464	unsigned iPageEnd = cbRange >> PAGE_SHIFT;
465	for (; iPage < iPageEnd; iPage++)
466	pCur->aPhysPages[iPage].Phys \|= MM_RAM_FLAGS_RESERVED;
467	int rc = PGMR3PhysSetFlags(pVM, GCPhys, cbRange, MM_RAM_FLAGS_RESERVED, ~0);
468	AssertRC(rc);
469
470	REMR3NotifyPhysReserve(pVM, GCPhys, cbRange);
471	return rc;
472	}
473
474
475	/**
476	* Get the size of the base RAM.
477	* This usually means the size of the first contigous block of physical memory.
478	*
479	* @returns The guest base RAM size.
480	* @param pVM The VM handle.
481	* @thread Any.
482	*/
483	MMR3DECL(uint64_t) MMR3PhysGetRamSize(PVM pVM)
484	{
485	return pVM->mm.s.cbRamBase;
486	}
487
488
489	/**
490	* Called by MMR3Reset to reset the shadow ROM.
491	*
492	* Resetting involves reloading the ROM into RAM and make it
493	* wriable again (as it was made read only at the end of the POST).
494	*
495	* @param pVM The VM handle.
496	*/
497	void mmR3PhysRomReset(PVM pVM)
498	{
499	for (PMMROMRANGE pCur = pVM->mm.s.pRomHead; pCur; pCur = pCur->pNext)
500	if (pCur->fShadow)
501	{
502	memcpy(pCur->pvCopy, pCur->pvBinary, pCur->cbRange);
503	if (!pCur->fWritable)
504	{
505	int rc = PGMHandlerPhysicalDeregister(pVM, pCur->GCPhys);
506	AssertRC(rc);
507	pCur->fWritable = true;
508
509	rc = PGMR3PhysSetFlags(pVM, pCur->GCPhys, pCur->cbRange, MM_RAM_FLAGS_MMIO2, ~0); /* ROM -> ROM + MMIO2 */
510	AssertRC(rc);
511
512	REMR3NotifyPhysRomRegister(pVM, pCur->GCPhys, pCur->cbRange, pCur->pvCopy, true /* read-write now */);
513	}
514	}
515	}
516
517
518	/**
519	* Write-protects a shadow ROM range.
520	*
521	* This is called late in the POST for shadow ROM ranges.
522	*
523	* @returns VBox status code.
524	* @param pVM The VM handle.
525	* @param GCPhys Start of the registered shadow ROM range
526	* @param cbRange The length of the registered shadow ROM range.
527	* This can be NULL (not sure about the BIOS interface yet).
528	*/
529	MMR3DECL(int) MMR3PhysRomProtect(PVM pVM, RTGCPHYS GCPhys, RTUINT cbRange)
530	{
531	for (PMMROMRANGE pCur = pVM->mm.s.pRomHead; pCur; pCur = pCur->pNext)
532	if ( pCur->GCPhys == GCPhys
533	&& ( pCur->cbRange == cbRange
534	\|\| !cbRange))
535	{
536	if (pCur->fWritable)
537	{
538	cbRange = pCur->cbRange;
539	int rc = PGMR3HandlerPhysicalRegister(pVM, PGMPHYSHANDLERTYPE_PHYSICAL_WRITE, GCPhys, GCPhys + cbRange - 1,
540	NULL, NULL,
541	NULL, "pgmGuestROMWriteHandler", 0,
542	NULL, "pgmGuestROMWriteHandler", 0, pCur->pszDesc);
543	AssertRCReturn(rc, rc);
544	pCur->fWritable = false;
545
546	rc = PGMR3PhysSetFlags(pVM, GCPhys, cbRange, 0, ~MM_RAM_FLAGS_MMIO2); /* ROM + MMIO2 -> ROM */
547	AssertRCReturn(rc, rc);
548	/* Don't bother with the MM page flags here because I don't think they are
549	really used beyond conflict checking at ROM, RAM, Reservation, etc. */
550
551	REMR3NotifyPhysRomRegister(pVM, GCPhys, cbRange, pCur->pvCopy, false /* read-only now */);
552	}
553	return VINF_SUCCESS;
554	}
555	AssertMsgFailed(("GCPhys=%VGp cbRange=%#x\n", GCPhys, cbRange));
556	return VERR_INVALID_PARAMETER;
557	}
558

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source: vbox/trunk/src/VBox/VMM/MMPhys.cpp@ 4388

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