memobj-r0drv.cpp@ 104868

Last change on this file since 104868 was 104849, checked in by vboxsync, 6 months ago
VMM/PGM,SUPDrv,IPRT: Added a RTR0MemObjZeroInitialize function to IPRT/SUPDrv for helping zero initializing MMIO2 backing memory. [build fixes] bugref:10687
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1	/* $Id: memobj-r0drv.cpp 104849 2024-06-05 09:42:06Z vboxsync $ */
2	/** @file
3	* IPRT - Ring-0 Memory Objects, Common Code.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define LOG_GROUP RTLOGGROUP_DEFAULT /// @todo RTLOGGROUP_MEM
42	#define RTMEM_NO_WRAP_TO_EF_APIS /* circular dependency otherwise. */
43	#include <iprt/memobj.h>
44	#include "internal/iprt.h"
45
46	#include <iprt/alloc.h>
47	#include <iprt/asm.h>
48	#include <iprt/assert.h>
49	#include <iprt/err.h>
50	#include <iprt/log.h>
51	#include <iprt/mp.h>
52	#include <iprt/param.h>
53	#include <iprt/process.h>
54	#include <iprt/string.h>
55	#include <iprt/thread.h>
56
57	#include "internal/memobj.h"
58
59
60	/**
61	* Internal function for allocating a new memory object.
62	*
63	* @returns The allocated and initialized handle.
64	* @param cbSelf The size of the memory object handle. 0 mean default size.
65	* @param enmType The memory object type.
66	* @param pv The memory object mapping.
67	* @param cb The size of the memory object.
68	* @param pszTag The tag string.
69	*/
70	DECLHIDDEN(PRTR0MEMOBJINTERNAL) rtR0MemObjNew(size_t cbSelf, RTR0MEMOBJTYPE enmType, void pv, size_t cb, const char pszTag)
71	{
72	PRTR0MEMOBJINTERNAL pNew;
73
74	/* validate the size */
75	if (!cbSelf)
76	cbSelf = sizeof(*pNew);
77	Assert(cbSelf >= sizeof(*pNew));
78	Assert(cbSelf == (uint32_t)cbSelf);
79	AssertMsg(RT_ALIGN_Z(cb, PAGE_SIZE) == cb, ("%#zx\n", cb));
80
81	/*
82	* Allocate and initialize the object.
83	*/
84	pNew = (PRTR0MEMOBJINTERNAL)RTMemAllocZ(cbSelf);
85	if (pNew)
86	{
87	pNew->u32Magic = RTR0MEMOBJ_MAGIC;
88	pNew->cbSelf = (uint32_t)cbSelf;
89	pNew->enmType = enmType;
90	pNew->fFlags = 0;
91	pNew->cb = cb;
92	pNew->pv = pv;
93	#ifdef DEBUG
94	pNew->pszTag = pszTag;
95	#else
96	RT_NOREF_PV(pszTag);
97	#endif
98	}
99	return pNew;
100	}
101
102
103	/**
104	* Deletes an incomplete memory object.
105	*
106	* This is for cleaning up after failures during object creation.
107	*
108	* @param pMem The incomplete memory object to delete.
109	*/
110	DECLHIDDEN(void) rtR0MemObjDelete(PRTR0MEMOBJINTERNAL pMem)
111	{
112	if (pMem)
113	{
114	ASMAtomicUoWriteU32(&pMem->u32Magic, ~RTR0MEMOBJ_MAGIC);
115	pMem->enmType = RTR0MEMOBJTYPE_END;
116	RTMemFree(pMem);
117	}
118	}
119
120
121	/**
122	* Links a mapping object to a primary object.
123	*
124	* @returns IPRT status code.
125	* @retval VINF_SUCCESS on success.
126	* @retval VINF_NO_MEMORY if we couldn't expand the mapping array of the parent.
127	* @param pParent The parent (primary) memory object.
128	* @param pChild The child (mapping) memory object.
129	*/
130	static int rtR0MemObjLink(PRTR0MEMOBJINTERNAL pParent, PRTR0MEMOBJINTERNAL pChild)
131	{
132	uint32_t i;
133
134	/* sanity */
135	Assert(rtR0MemObjIsMapping(pChild));
136	Assert(!rtR0MemObjIsMapping(pParent));
137
138	/* expand the array? */
139	i = pParent->uRel.Parent.cMappings;
140	if (i >= pParent->uRel.Parent.cMappingsAllocated)
141	{
142	void *pv = RTMemRealloc(pParent->uRel.Parent.papMappings,
143	(i + 32) * sizeof(pParent->uRel.Parent.papMappings[0]));
144	if (!pv)
145	return VERR_NO_MEMORY;
146	pParent->uRel.Parent.papMappings = (PPRTR0MEMOBJINTERNAL)pv;
147	pParent->uRel.Parent.cMappingsAllocated = i + 32;
148	Assert(i == pParent->uRel.Parent.cMappings);
149	}
150
151	/* do the linking. */
152	pParent->uRel.Parent.papMappings[i] = pChild;
153	pParent->uRel.Parent.cMappings++;
154	pChild->uRel.Child.pParent = pParent;
155
156	return VINF_SUCCESS;
157	}
158
159
160	RTR0DECL(bool) RTR0MemObjIsMapping(RTR0MEMOBJ MemObj)
161	{
162	/* Validate the object handle. */
163	PRTR0MEMOBJINTERNAL pMem;
164	AssertPtrReturn(MemObj, false);
165	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
166	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), false);
167	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), false);
168
169	/* hand it on to the inlined worker. */
170	return rtR0MemObjIsMapping(pMem);
171	}
172	RT_EXPORT_SYMBOL(RTR0MemObjIsMapping);
173
174
175	RTR0DECL(void *) RTR0MemObjAddress(RTR0MEMOBJ MemObj)
176	{
177	/* Validate the object handle. */
178	PRTR0MEMOBJINTERNAL pMem;
179	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
180	return NULL;
181	AssertPtrReturn(MemObj, NULL);
182	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
183	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NULL);
184	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NULL);
185
186	/* return the mapping address. */
187	return pMem->pv;
188	}
189	RT_EXPORT_SYMBOL(RTR0MemObjAddress);
190
191
192	RTR0DECL(RTR3PTR) RTR0MemObjAddressR3(RTR0MEMOBJ MemObj)
193	{
194	PRTR0MEMOBJINTERNAL pMem;
195
196	/* Validate the object handle. */
197	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
198	return NIL_RTR3PTR;
199	AssertPtrReturn(MemObj, NIL_RTR3PTR);
200	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
201	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NIL_RTR3PTR);
202	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NIL_RTR3PTR);
203	if (RT_UNLIKELY( ( pMem->enmType != RTR0MEMOBJTYPE_MAPPING
204	\|\| pMem->u.Mapping.R0Process == NIL_RTR0PROCESS)
205	&& ( pMem->enmType != RTR0MEMOBJTYPE_LOCK
206	\|\| pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
207	&& ( pMem->enmType != RTR0MEMOBJTYPE_PHYS_NC
208	\|\| pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
209	&& ( pMem->enmType != RTR0MEMOBJTYPE_RES_VIRT
210	\|\| pMem->u.ResVirt.R0Process == NIL_RTR0PROCESS)))
211	return NIL_RTR3PTR;
212
213	/* return the mapping address. */
214	return (RTR3PTR)pMem->pv;
215	}
216	RT_EXPORT_SYMBOL(RTR0MemObjAddressR3);
217
218
219	RTR0DECL(size_t) RTR0MemObjSize(RTR0MEMOBJ MemObj)
220	{
221	PRTR0MEMOBJINTERNAL pMem;
222
223	/* Validate the object handle. */
224	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
225	return 0;
226	AssertPtrReturn(MemObj, 0);
227	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
228	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), 0);
229	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), 0);
230	AssertMsg(RT_ALIGN_Z(pMem->cb, PAGE_SIZE) == pMem->cb, ("%#zx\n", pMem->cb));
231
232	/* return the size. */
233	return pMem->cb;
234	}
235	RT_EXPORT_SYMBOL(RTR0MemObjSize);
236
237
238	/* Work around gcc bug 55940 */
239	#if defined(__GNUC__) && defined(RT_ARCH_X86) && (__GNUC__ * 100 + __GNUC_MINOR__) == 407
240	__attribute__((__optimize__ ("no-shrink-wrap")))
241	#endif
242	RTR0DECL(RTHCPHYS) RTR0MemObjGetPagePhysAddr(RTR0MEMOBJ MemObj, size_t iPage)
243	{
244	/* Validate the object handle. */
245	PRTR0MEMOBJINTERNAL pMem;
246	size_t cPages;
247	AssertPtrReturn(MemObj, NIL_RTHCPHYS);
248	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
249	AssertReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, NIL_RTHCPHYS);
250	AssertReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, NIL_RTHCPHYS);
251	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NIL_RTHCPHYS);
252	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NIL_RTHCPHYS);
253	cPages = (pMem->cb >> PAGE_SHIFT);
254	if (iPage >= cPages)
255	{
256	/* permit: while (RTR0MemObjGetPagePhysAddr(pMem, iPage++) != NIL_RTHCPHYS) {} */
257	if (iPage == cPages)
258	return NIL_RTHCPHYS;
259	AssertReturn(iPage < (pMem->cb >> PAGE_SHIFT), NIL_RTHCPHYS);
260	}
261
262	/*
263	* We know the address of physically contiguous allocations and mappings.
264	*/
265	if (pMem->enmType == RTR0MEMOBJTYPE_CONT)
266	return pMem->u.Cont.Phys + iPage * PAGE_SIZE;
267	if (pMem->enmType == RTR0MEMOBJTYPE_PHYS)
268	return pMem->u.Phys.PhysBase + iPage * PAGE_SIZE;
269
270	/*
271	* Do the job.
272	*/
273	return rtR0MemObjNativeGetPagePhysAddr(pMem, iPage);
274	}
275	RT_EXPORT_SYMBOL(RTR0MemObjGetPagePhysAddr);
276
277
278	RTR0DECL(bool) RTR0MemObjWasZeroInitialized(RTR0MEMOBJ hMemObj)
279	{
280	PRTR0MEMOBJINTERNAL pMem;
281
282	/* Validate the object handle. */
283	if (RT_UNLIKELY(hMemObj == NIL_RTR0MEMOBJ))
284	return false;
285	AssertPtrReturn(hMemObj, false);
286	pMem = (PRTR0MEMOBJINTERNAL)hMemObj;
287	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), false);
288	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), false);
289	Assert( (pMem->fFlags & (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC))
290	!= (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC));
291
292	/* return the alloc init state. */
293	return (pMem->fFlags & (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC))
294	== RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC;
295	}
296	RT_EXPORT_SYMBOL(RTR0MemObjWasZeroInitialized);
297
298
299	RTR0DECL(int) RTR0MemObjZeroInitialize(RTR0MEMOBJ hMemObj, bool fForce)
300	{
301	PRTR0MEMOBJINTERNAL pMem;
302
303	/* Validate the object handle. */
304	AssertReturn(hMemObj != NIL_RTR0MEMOBJ, VERR_INVALID_HANDLE);
305	AssertPtrReturn(hMemObj, VERR_INVALID_HANDLE);
306	pMem = (PRTR0MEMOBJINTERNAL)hMemObj;
307	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), VERR_INVALID_HANDLE);
308	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), VERR_INVALID_HANDLE);
309	AssertReturn( (pMem->enmType != RTR0MEMOBJTYPE_MAPPING \|\| pMem->u.Mapping.R0Process == NIL_RTR0PROCESS)
310	&& (pMem->enmType != RTR0MEMOBJTYPE_LOCK \|\| pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
311	&& pMem->enmType != RTR0MEMOBJTYPE_RES_VIRT
312	, VERR_WRONG_TYPE);
313	Assert( (pMem->fFlags & (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC))
314	!= (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC));
315
316	/*
317	* Do we need to do anything?
318	*/
319	if ( fForce
320	\|\| (pMem->fFlags & (RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC \| RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC))
321	!= RTR0MEMOBJ_FLAGS_ZERO_AT_ALLOC)
322	{
323	/* This is easy if there is a ring-0 mapping: */
324	if (pMem->pv)
325	RT_BZERO(pMem->pv, pMem->cb);
326	else
327	return rtR0MemObjNativeZeroInitWithoutMapping(pMem);
328	}
329	return VINF_SUCCESS;
330	}
331	RT_EXPORT_SYMBOL(RTR0MemObjZeroInitialize);
332
333
334	RTR0DECL(int) RTR0MemObjFree(RTR0MEMOBJ MemObj, bool fFreeMappings)
335	{
336	/*
337	* Validate the object handle.
338	*/
339	PRTR0MEMOBJINTERNAL pMem;
340	int rc;
341
342	if (MemObj == NIL_RTR0MEMOBJ)
343	return VINF_SUCCESS;
344	AssertPtrReturn(MemObj, VERR_INVALID_HANDLE);
345	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
346	AssertReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
347	AssertReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
348	RT_ASSERT_PREEMPTIBLE();
349
350	/*
351	* Deal with mappings according to fFreeMappings.
352	*/
353	if ( !rtR0MemObjIsMapping(pMem)
354	&& pMem->uRel.Parent.cMappings > 0)
355	{
356	/* fail if not requested to free mappings. */
357	if (!fFreeMappings)
358	return VERR_MEMORY_BUSY;
359
360	while (pMem->uRel.Parent.cMappings > 0)
361	{
362	PRTR0MEMOBJINTERNAL pChild = pMem->uRel.Parent.papMappings[--pMem->uRel.Parent.cMappings];
363	pMem->uRel.Parent.papMappings[pMem->uRel.Parent.cMappings] = NULL;
364
365	/* sanity checks. */
366	AssertPtr(pChild);
367	AssertFatal(pChild->u32Magic == RTR0MEMOBJ_MAGIC);
368	AssertFatal(pChild->enmType > RTR0MEMOBJTYPE_INVALID && pChild->enmType < RTR0MEMOBJTYPE_END);
369	AssertFatal(rtR0MemObjIsMapping(pChild));
370
371	/* free the mapping. */
372	rc = rtR0MemObjNativeFree(pChild);
373	if (RT_FAILURE(rc))
374	{
375	Log(("RTR0MemObjFree: failed to free mapping %p: %p %#zx; rc=%Rrc\n", pChild, pChild->pv, pChild->cb, rc));
376	pMem->uRel.Parent.papMappings[pMem->uRel.Parent.cMappings++] = pChild;
377	return rc;
378	}
379
380	pChild->u32Magic++;
381	pChild->enmType = RTR0MEMOBJTYPE_END;
382	RTMemFree(pChild);
383	}
384	}
385
386	/*
387	* Free this object.
388	*/
389	rc = rtR0MemObjNativeFree(pMem);
390	if (RT_SUCCESS(rc))
391	{
392	/*
393	* Ok, it was freed just fine. Now, if it's a mapping we'll have to remove it from the parent.
394	*/
395	if (rtR0MemObjIsMapping(pMem))
396	{
397	PRTR0MEMOBJINTERNAL pParent = pMem->uRel.Child.pParent;
398	uint32_t i;
399
400	/* sanity checks */
401	AssertPtr(pParent);
402	AssertFatal(pParent->u32Magic == RTR0MEMOBJ_MAGIC);
403	AssertFatal(pParent->enmType > RTR0MEMOBJTYPE_INVALID && pParent->enmType < RTR0MEMOBJTYPE_END);
404	AssertFatal(!rtR0MemObjIsMapping(pParent));
405	AssertFatal(pParent->uRel.Parent.cMappings > 0);
406	AssertPtr(pParent->uRel.Parent.papMappings);
407
408	/* locate and remove from the array of mappings. */
409	i = pParent->uRel.Parent.cMappings;
410	while (i-- > 0)
411	{
412	if (pParent->uRel.Parent.papMappings[i] == pMem)
413	{
414	pParent->uRel.Parent.papMappings[i] = pParent->uRel.Parent.papMappings[--pParent->uRel.Parent.cMappings];
415	break;
416	}
417	}
418	Assert(i != UINT32_MAX);
419	}
420	else
421	Assert(pMem->uRel.Parent.cMappings == 0);
422
423	/*
424	* Finally, destroy the handle.
425	*/
426	pMem->u32Magic++;
427	pMem->enmType = RTR0MEMOBJTYPE_END;
428	if (!rtR0MemObjIsMapping(pMem))
429	RTMemFree(pMem->uRel.Parent.papMappings);
430	RTMemFree(pMem);
431	}
432	else
433	Log(("RTR0MemObjFree: failed to free %p: %d %p %#zx; rc=%Rrc\n",
434	pMem, pMem->enmType, pMem->pv, pMem->cb, rc));
435	return rc;
436	}
437	RT_EXPORT_SYMBOL(RTR0MemObjFree);
438
439
440
441	RTR0DECL(int) RTR0MemObjAllocPageTag(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable, const char *pszTag)
442	{
443	/* sanity checks. */
444	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
445	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
446	*pMemObj = NIL_RTR0MEMOBJ;
447	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
448	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
449	RT_ASSERT_PREEMPTIBLE();
450
451	/* do the allocation. */
452	return rtR0MemObjNativeAllocPage(pMemObj, cbAligned, fExecutable, pszTag);
453	}
454	RT_EXPORT_SYMBOL(RTR0MemObjAllocPageTag);
455
456
457	RTR0DECL(int) RTR0MemObjAllocLargeTag(PRTR0MEMOBJ pMemObj, size_t cb, size_t cbLargePage, uint32_t fFlags, const char *pszTag)
458	{
459	/* sanity checks. */
460	const size_t cbAligned = RT_ALIGN_Z(cb, cbLargePage);
461	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
462	*pMemObj = NIL_RTR0MEMOBJ;
463	#ifdef RT_ARCH_AMD64
464	AssertReturn(cbLargePage == _2M \|\| cbLargePage == _1G, VERR_OUT_OF_RANGE);
465	#elif defined(RT_ARCH_X86)
466	AssertReturn(cbLargePage == _2M \|\| cbLargePage == _4M, VERR_OUT_OF_RANGE);
467	#else
468	AssertReturn(RT_IS_POWER_OF_TWO(cbLargePage), VERR_NOT_POWER_OF_TWO);
469	AssertReturn(cbLargePage > PAGE_SIZE, VERR_OUT_OF_RANGE);
470	#endif
471	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
472	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
473	AssertReturn(!(fFlags & ~RTMEMOBJ_ALLOC_LARGE_F_VALID_MASK), VERR_INVALID_PARAMETER);
474	RT_ASSERT_PREEMPTIBLE();
475
476	/* do the allocation. */
477	return rtR0MemObjNativeAllocLarge(pMemObj, cbAligned, cbLargePage, fFlags, pszTag);
478	}
479	RT_EXPORT_SYMBOL(RTR0MemObjAllocLargeTag);
480
481
482	/**
483	* Fallback implementation of rtR0MemObjNativeAllocLarge and implements single
484	* page allocation using rtR0MemObjNativeAllocPhys.
485	*/
486	DECLHIDDEN(int) rtR0MemObjFallbackAllocLarge(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, size_t cbLargePage, uint32_t fFlags,
487	const char *pszTag)
488	{
489	RT_NOREF(pszTag, fFlags);
490	if (cb == cbLargePage)
491	return rtR0MemObjNativeAllocPhys(ppMem, cb, NIL_RTHCPHYS, cbLargePage, pszTag);
492	return VERR_NOT_SUPPORTED;
493	}
494
495
496	RTR0DECL(int) RTR0MemObjAllocLowTag(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable, const char *pszTag)
497	{
498	/* sanity checks. */
499	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
500	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
501	*pMemObj = NIL_RTR0MEMOBJ;
502	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
503	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
504	RT_ASSERT_PREEMPTIBLE();
505
506	/* do the allocation. */
507	return rtR0MemObjNativeAllocLow(pMemObj, cbAligned, fExecutable, pszTag);
508	}
509	RT_EXPORT_SYMBOL(RTR0MemObjAllocLowTag);
510
511
512	RTR0DECL(int) RTR0MemObjAllocContTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, bool fExecutable, const char *pszTag)
513	{
514	/* sanity checks. */
515	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
516	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
517	*pMemObj = NIL_RTR0MEMOBJ;
518	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
519	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
520	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
521	RT_ASSERT_PREEMPTIBLE();
522
523	/* do the allocation. */
524	return rtR0MemObjNativeAllocCont(pMemObj, cbAligned, PhysHighest, fExecutable, pszTag);
525	}
526	RT_EXPORT_SYMBOL(RTR0MemObjAllocContTag);
527
528
529	RTR0DECL(int) RTR0MemObjLockUserTag(PRTR0MEMOBJ pMemObj, RTR3PTR R3Ptr, size_t cb,
530	uint32_t fAccess, RTR0PROCESS R0Process, const char *pszTag)
531	{
532	/* sanity checks. */
533	const size_t cbAligned = RT_ALIGN_Z(cb + (R3Ptr & PAGE_OFFSET_MASK), PAGE_SIZE);
534	RTR3PTR const R3PtrAligned = (R3Ptr & ~(RTR3PTR)PAGE_OFFSET_MASK);
535	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
536	*pMemObj = NIL_RTR0MEMOBJ;
537	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
538	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
539	if (R0Process == NIL_RTR0PROCESS)
540	R0Process = RTR0ProcHandleSelf();
541	AssertReturn(!(fAccess & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE)), VERR_INVALID_PARAMETER);
542	AssertReturn(fAccess, VERR_INVALID_PARAMETER);
543	RT_ASSERT_PREEMPTIBLE();
544
545	/* do the locking. */
546	return rtR0MemObjNativeLockUser(pMemObj, R3PtrAligned, cbAligned, fAccess, R0Process, pszTag);
547	}
548	RT_EXPORT_SYMBOL(RTR0MemObjLockUserTag);
549
550
551	RTR0DECL(int) RTR0MemObjLockKernelTag(PRTR0MEMOBJ pMemObj, void pv, size_t cb, uint32_t fAccess, const char pszTag)
552	{
553	/* sanity checks. */
554	const size_t cbAligned = RT_ALIGN_Z(cb + ((uintptr_t)pv & PAGE_OFFSET_MASK), PAGE_SIZE);
555	void * const pvAligned = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
556	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
557	*pMemObj = NIL_RTR0MEMOBJ;
558	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
559	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
560	AssertPtrReturn(pvAligned, VERR_INVALID_POINTER);
561	AssertReturn(!(fAccess & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE)), VERR_INVALID_PARAMETER);
562	AssertReturn(fAccess, VERR_INVALID_PARAMETER);
563	RT_ASSERT_PREEMPTIBLE();
564
565	/* do the allocation. */
566	return rtR0MemObjNativeLockKernel(pMemObj, pvAligned, cbAligned, fAccess, pszTag);
567	}
568	RT_EXPORT_SYMBOL(RTR0MemObjLockKernelTag);
569
570
571	RTR0DECL(int) RTR0MemObjAllocPhysTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, const char *pszTag)
572	{
573	/* sanity checks. */
574	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
575	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
576	*pMemObj = NIL_RTR0MEMOBJ;
577	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
578	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
579	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
580	RT_ASSERT_PREEMPTIBLE();
581
582	/* do the allocation. */
583	return rtR0MemObjNativeAllocPhys(pMemObj, cbAligned, PhysHighest, PAGE_SIZE /* page aligned */, pszTag);
584	}
585	RT_EXPORT_SYMBOL(RTR0MemObjAllocPhysTag);
586
587
588	RTR0DECL(int) RTR0MemObjAllocPhysExTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment, const char *pszTag)
589	{
590	/* sanity checks. */
591	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
592	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
593	*pMemObj = NIL_RTR0MEMOBJ;
594	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
595	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
596	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
597	if (uAlignment == 0)
598	uAlignment = PAGE_SIZE;
599	AssertReturn( uAlignment == PAGE_SIZE
600	\|\| uAlignment == _2M
601	\|\| uAlignment == _4M
602	\|\| uAlignment == _1G,
603	VERR_INVALID_PARAMETER);
604	#if HC_ARCH_BITS == 32
605	/* Memory allocated in this way is typically mapped into kernel space as well; simply
606	don't allow this on 32 bits hosts as the kernel space is too crowded already. */
607	if (uAlignment != PAGE_SIZE)
608	return VERR_NOT_SUPPORTED;
609	#endif
610	RT_ASSERT_PREEMPTIBLE();
611
612	/* do the allocation. */
613	return rtR0MemObjNativeAllocPhys(pMemObj, cbAligned, PhysHighest, uAlignment, pszTag);
614	}
615	RT_EXPORT_SYMBOL(RTR0MemObjAllocPhysExTag);
616
617
618	RTR0DECL(int) RTR0MemObjAllocPhysNCTag(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest, const char *pszTag)
619	{
620	/* sanity checks. */
621	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
622	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
623	*pMemObj = NIL_RTR0MEMOBJ;
624	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
625	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
626	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
627	RT_ASSERT_PREEMPTIBLE();
628
629	/* do the allocation. */
630	return rtR0MemObjNativeAllocPhysNC(pMemObj, cbAligned, PhysHighest, pszTag);
631	}
632	RT_EXPORT_SYMBOL(RTR0MemObjAllocPhysNCTag);
633
634
635	RTR0DECL(int) RTR0MemObjEnterPhysTag(PRTR0MEMOBJ pMemObj, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy, const char *pszTag)
636	{
637	/* sanity checks. */
638	const size_t cbAligned = RT_ALIGN_Z(cb + (Phys & PAGE_OFFSET_MASK), PAGE_SIZE);
639	const RTHCPHYS PhysAligned = Phys & ~(RTHCPHYS)PAGE_OFFSET_MASK;
640	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
641	*pMemObj = NIL_RTR0MEMOBJ;
642	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
643	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
644	AssertReturn(Phys != NIL_RTHCPHYS, VERR_INVALID_PARAMETER);
645	AssertReturn( uCachePolicy == RTMEM_CACHE_POLICY_DONT_CARE
646	\|\| uCachePolicy == RTMEM_CACHE_POLICY_MMIO,
647	VERR_INVALID_PARAMETER);
648	RT_ASSERT_PREEMPTIBLE();
649
650	/* do the allocation. */
651	return rtR0MemObjNativeEnterPhys(pMemObj, PhysAligned, cbAligned, uCachePolicy, pszTag);
652	}
653	RT_EXPORT_SYMBOL(RTR0MemObjEnterPhysTag);
654
655
656	RTR0DECL(int) RTR0MemObjReserveKernelTag(PRTR0MEMOBJ pMemObj, void pvFixed, size_t cb, size_t uAlignment, const char pszTag)
657	{
658	/* sanity checks. */
659	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
660	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
661	*pMemObj = NIL_RTR0MEMOBJ;
662	if (uAlignment == 0)
663	uAlignment = PAGE_SIZE;
664	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
665	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
666	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
667	if (pvFixed != (void *)-1)
668	AssertReturn(!((uintptr_t)pvFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
669	RT_ASSERT_PREEMPTIBLE();
670
671	/* do the reservation. */
672	return rtR0MemObjNativeReserveKernel(pMemObj, pvFixed, cbAligned, uAlignment, pszTag);
673	}
674	RT_EXPORT_SYMBOL(RTR0MemObjReserveKernelTag);
675
676
677	RTR0DECL(int) RTR0MemObjReserveUserTag(PRTR0MEMOBJ pMemObj, RTR3PTR R3PtrFixed, size_t cb,
678	size_t uAlignment, RTR0PROCESS R0Process, const char *pszTag)
679	{
680	/* sanity checks. */
681	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
682	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
683	*pMemObj = NIL_RTR0MEMOBJ;
684	if (uAlignment == 0)
685	uAlignment = PAGE_SIZE;
686	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
687	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
688	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
689	if (R3PtrFixed != (RTR3PTR)-1)
690	AssertReturn(!(R3PtrFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
691	if (R0Process == NIL_RTR0PROCESS)
692	R0Process = RTR0ProcHandleSelf();
693	RT_ASSERT_PREEMPTIBLE();
694
695	/* do the reservation. */
696	return rtR0MemObjNativeReserveUser(pMemObj, R3PtrFixed, cbAligned, uAlignment, R0Process, pszTag);
697	}
698	RT_EXPORT_SYMBOL(RTR0MemObjReserveUserTag);
699
700
701	RTR0DECL(int) RTR0MemObjMapKernelTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, void *pvFixed,
702	size_t uAlignment, unsigned fProt, const char *pszTag)
703	{
704	return RTR0MemObjMapKernelExTag(pMemObj, MemObjToMap, pvFixed, uAlignment, fProt, 0, 0, pszTag);
705	}
706	RT_EXPORT_SYMBOL(RTR0MemObjMapKernelTag);
707
708
709	RTR0DECL(int) RTR0MemObjMapKernelExTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, void *pvFixed, size_t uAlignment,
710	unsigned fProt, size_t offSub, size_t cbSub, const char *pszTag)
711	{
712	PRTR0MEMOBJINTERNAL pMemToMap;
713	PRTR0MEMOBJINTERNAL pNew;
714	int rc;
715
716	/* sanity checks. */
717	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
718	*pMemObj = NIL_RTR0MEMOBJ;
719	AssertPtrReturn(MemObjToMap, VERR_INVALID_HANDLE);
720	pMemToMap = (PRTR0MEMOBJINTERNAL)MemObjToMap;
721	AssertReturn(pMemToMap->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
722	AssertReturn(pMemToMap->enmType > RTR0MEMOBJTYPE_INVALID && pMemToMap->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
723	AssertReturn(!rtR0MemObjIsMapping(pMemToMap), VERR_INVALID_PARAMETER);
724	AssertReturn(pMemToMap->enmType != RTR0MEMOBJTYPE_RES_VIRT, VERR_INVALID_PARAMETER);
725	if (uAlignment == 0)
726	uAlignment = PAGE_SIZE;
727	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
728	if (pvFixed != (void *)-1)
729	AssertReturn(!((uintptr_t)pvFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
730	AssertReturn(fProt != RTMEM_PROT_NONE, VERR_INVALID_PARAMETER);
731	AssertReturn(!(fProt & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC)), VERR_INVALID_PARAMETER);
732	AssertReturn(!(offSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
733	AssertReturn(offSub < pMemToMap->cb, VERR_INVALID_PARAMETER);
734	AssertReturn(!(cbSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
735	AssertReturn(cbSub <= pMemToMap->cb, VERR_INVALID_PARAMETER);
736	AssertReturn((!offSub && !cbSub) \|\| (offSub + cbSub) <= pMemToMap->cb, VERR_INVALID_PARAMETER);
737	RT_ASSERT_PREEMPTIBLE();
738
739	/* adjust the request to simplify the native code. */
740	if (offSub == 0 && cbSub == pMemToMap->cb)
741	cbSub = 0;
742
743	/* do the mapping. */
744	rc = rtR0MemObjNativeMapKernel(&pNew, pMemToMap, pvFixed, uAlignment, fProt, offSub, cbSub, pszTag);
745	if (RT_SUCCESS(rc))
746	{
747	/* link it. */
748	rc = rtR0MemObjLink(pMemToMap, pNew);
749	if (RT_SUCCESS(rc))
750	*pMemObj = pNew;
751	else
752	{
753	/* damn, out of memory. bail out. */
754	int rc2 = rtR0MemObjNativeFree(pNew);
755	AssertRC(rc2);
756	pNew->u32Magic++;
757	pNew->enmType = RTR0MEMOBJTYPE_END;
758	RTMemFree(pNew);
759	}
760	}
761
762	return rc;
763	}
764	RT_EXPORT_SYMBOL(RTR0MemObjMapKernelExTag);
765
766
767	RTR0DECL(int) RTR0MemObjMapUserTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, RTR3PTR R3PtrFixed,
768	size_t uAlignment, unsigned fProt, RTR0PROCESS R0Process, const char *pszTag)
769	{
770	return RTR0MemObjMapUserExTag(pMemObj, MemObjToMap, R3PtrFixed, uAlignment, fProt, R0Process, 0, 0, pszTag);
771	}
772	RT_EXPORT_SYMBOL(RTR0MemObjMapUserTag);
773
774
775	RTR0DECL(int) RTR0MemObjMapUserExTag(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, RTR3PTR R3PtrFixed, size_t uAlignment,
776	unsigned fProt, RTR0PROCESS R0Process, size_t offSub, size_t cbSub, const char *pszTag)
777	{
778	/* sanity checks. */
779	PRTR0MEMOBJINTERNAL pMemToMap;
780	PRTR0MEMOBJINTERNAL pNew;
781	int rc;
782	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
783	pMemToMap = (PRTR0MEMOBJINTERNAL)MemObjToMap;
784	*pMemObj = NIL_RTR0MEMOBJ;
785	AssertPtrReturn(MemObjToMap, VERR_INVALID_HANDLE);
786	AssertReturn(pMemToMap->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
787	AssertReturn(pMemToMap->enmType > RTR0MEMOBJTYPE_INVALID && pMemToMap->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
788	AssertReturn(!rtR0MemObjIsMapping(pMemToMap), VERR_INVALID_PARAMETER);
789	AssertReturn(pMemToMap->enmType != RTR0MEMOBJTYPE_RES_VIRT, VERR_INVALID_PARAMETER);
790	if (uAlignment == 0)
791	uAlignment = PAGE_SIZE;
792	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
793	if (R3PtrFixed != (RTR3PTR)-1)
794	AssertReturn(!(R3PtrFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
795	AssertReturn(fProt != RTMEM_PROT_NONE, VERR_INVALID_PARAMETER);
796	AssertReturn(!(fProt & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC)), VERR_INVALID_PARAMETER);
797	AssertReturn(!(offSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
798	AssertReturn(offSub < pMemToMap->cb, VERR_INVALID_PARAMETER);
799	AssertReturn(!(cbSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
800	AssertReturn(cbSub <= pMemToMap->cb, VERR_INVALID_PARAMETER);
801	AssertReturn((!offSub && !cbSub) \|\| (offSub + cbSub) <= pMemToMap->cb, VERR_INVALID_PARAMETER);
802	if (R0Process == NIL_RTR0PROCESS)
803	R0Process = RTR0ProcHandleSelf();
804	RT_ASSERT_PREEMPTIBLE();
805
806	/* adjust the request to simplify the native code. */
807	if (offSub == 0 && cbSub == pMemToMap->cb)
808	cbSub = 0;
809
810	/* do the mapping. */
811	rc = rtR0MemObjNativeMapUser(&pNew, pMemToMap, R3PtrFixed, uAlignment, fProt, R0Process, offSub, cbSub, pszTag);
812	if (RT_SUCCESS(rc))
813	{
814	/* link it. */
815	rc = rtR0MemObjLink(pMemToMap, pNew);
816	if (RT_SUCCESS(rc))
817	*pMemObj = pNew;
818	else
819	{
820	/* damn, out of memory. bail out. */
821	int rc2 = rtR0MemObjNativeFree(pNew);
822	AssertRC(rc2);
823	pNew->u32Magic++;
824	pNew->enmType = RTR0MEMOBJTYPE_END;
825	RTMemFree(pNew);
826	}
827	}
828
829	return rc;
830	}
831	RT_EXPORT_SYMBOL(RTR0MemObjMapUserExTag);
832
833
834	RTR0DECL(int) RTR0MemObjProtect(RTR0MEMOBJ hMemObj, size_t offSub, size_t cbSub, uint32_t fProt)
835	{
836	PRTR0MEMOBJINTERNAL pMemObj;
837	int rc;
838
839	/* sanity checks. */
840	pMemObj = (PRTR0MEMOBJINTERNAL)hMemObj;
841	AssertPtrReturn(pMemObj, VERR_INVALID_HANDLE);
842	AssertReturn(pMemObj->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
843	AssertReturn(pMemObj->enmType > RTR0MEMOBJTYPE_INVALID && pMemObj->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
844	AssertReturn(rtR0MemObjIsProtectable(pMemObj), VERR_INVALID_PARAMETER);
845	AssertReturn(!(offSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
846	AssertReturn(offSub < pMemObj->cb, VERR_INVALID_PARAMETER);
847	AssertReturn(!(cbSub & PAGE_OFFSET_MASK), VERR_INVALID_PARAMETER);
848	AssertReturn(cbSub <= pMemObj->cb, VERR_INVALID_PARAMETER);
849	AssertReturn(offSub + cbSub <= pMemObj->cb, VERR_INVALID_PARAMETER);
850	AssertReturn(!(fProt & ~(RTMEM_PROT_NONE \| RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC)), VERR_INVALID_PARAMETER);
851	RT_ASSERT_PREEMPTIBLE();
852
853	/* do the job */
854	rc = rtR0MemObjNativeProtect(pMemObj, offSub, cbSub, fProt);
855	if (RT_SUCCESS(rc))
856	pMemObj->fFlags \|= RTR0MEMOBJ_FLAGS_PROT_CHANGED; /* record it */
857
858	return rc;
859	}
860	RT_EXPORT_SYMBOL(RTR0MemObjProtect);
861

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source: vbox/trunk/src/VBox/Runtime/r0drv/memobj-r0drv.cpp@ 104868

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