memobj-r0drv.cpp@ 8217

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1	/* $Revision: 8170 $ */
2	/** @file
3	* Incredibly Portable Runtime - Ring-0 Memory Objects, Common Code.
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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*
26	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27	* Clara, CA 95054 USA or visit http://www.sun.com if you need
28	* additional information or have any questions.
29	*/
30
31
32	/*******************************************************************************
33	* Header Files *
34	*******************************************************************************/
35	#define LOG_GROUP RTLOGGROUP_DEFAULT ///@todo RTLOGGROUP_MEM
36	#include <iprt/memobj.h>
37	#include <iprt/alloc.h>
38	#include <iprt/process.h>
39	#include <iprt/assert.h>
40	#include <iprt/err.h>
41	#include <iprt/log.h>
42	#include <iprt/param.h>
43	#include "internal/memobj.h"
44
45
46	/**
47	* Internal function for allocating a new memory object.
48	*
49	* @returns The allocated and initialized handle.
50	* @param cbSelf The size of the memory object handle. 0 mean default size.
51	* @param enmType The memory object type.
52	* @param pv The memory object mapping.
53	* @param cb The size of the memory object.
54	*/
55	PRTR0MEMOBJINTERNAL rtR0MemObjNew(size_t cbSelf, RTR0MEMOBJTYPE enmType, void *pv, size_t cb)
56	{
57	PRTR0MEMOBJINTERNAL pNew;
58
59	/* validate the size */
60	if (!cbSelf)
61	cbSelf = sizeof(*pNew);
62	Assert(cbSelf >= sizeof(*pNew));
63	Assert(cbSelf == (uint32_t)cbSelf);
64
65	/*
66	* Allocate and initialize the object.
67	*/
68	pNew = (PRTR0MEMOBJINTERNAL)RTMemAllocZ(cbSelf);
69	if (pNew)
70	{
71	pNew->u32Magic = RTR0MEMOBJ_MAGIC;
72	pNew->cbSelf = (uint32_t)cbSelf;
73	pNew->enmType = enmType;
74	pNew->cb = cb;
75	pNew->pv = pv;
76	}
77	return pNew;
78	}
79
80
81	/**
82	* Deletes an incomplete memory object.
83	*
84	* This is for cleaning up after failures during object creation.
85	*
86	* @param pMem The incomplete memory object to delete.
87	*/
88	void rtR0MemObjDelete(PRTR0MEMOBJINTERNAL pMem)
89	{
90	if (pMem)
91	{
92	pMem->u32Magic++;
93	pMem->enmType = RTR0MEMOBJTYPE_END;
94	RTMemFree(pMem);
95	}
96	}
97
98
99	/**
100	* Links a mapping object to a primary object.
101	*
102	* @returns IPRT status code.
103	* @retval VINF_SUCCESS on success.
104	* @retval VINF_NO_MEMORY if we couldn't expand the mapping array of the parent.
105	* @param pParent The parent (primary) memory object.
106	* @param pChild The child (mapping) memory object.
107	*/
108	static int rtR0MemObjLink(PRTR0MEMOBJINTERNAL pParent, PRTR0MEMOBJINTERNAL pChild)
109	{
110	uint32_t i;
111
112	/* sanity */
113	Assert(rtR0MemObjIsMapping(pChild));
114	Assert(!rtR0MemObjIsMapping(pParent));
115
116	/* expand the array? */
117	i = pParent->uRel.Parent.cMappings;
118	if (i >= pParent->uRel.Parent.cMappingsAllocated)
119	{
120	void *pv = RTMemRealloc(pParent->uRel.Parent.papMappings,
121	(i + 32) * sizeof(pParent->uRel.Parent.papMappings[0]));
122	if (!pv)
123	return VERR_NO_MEMORY;
124	pParent->uRel.Parent.papMappings = (PPRTR0MEMOBJINTERNAL)pv;
125	pParent->uRel.Parent.cMappingsAllocated = i + 32;
126	Assert(i == pParent->uRel.Parent.cMappings);
127	}
128
129	/* do the linking. */
130	pParent->uRel.Parent.papMappings[i] = pChild;
131	pParent->uRel.Parent.cMappings++;
132	pChild->uRel.Child.pParent = pParent;
133
134	return VINF_SUCCESS;
135	}
136
137
138	/**
139	* Checks if this is mapping or not.
140	*
141	* @returns true if it's a mapping, otherwise false.
142	* @param MemObj The ring-0 memory object handle.
143	*/
144	RTR0DECL(bool) RTR0MemObjIsMapping(RTR0MEMOBJ MemObj)
145	{
146	/* Validate the object handle. */
147	PRTR0MEMOBJINTERNAL pMem;
148	AssertPtrReturn(MemObj, false);
149	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
150	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), false);
151	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), false);
152
153	/* hand it on to the inlined worker. */
154	return rtR0MemObjIsMapping(pMem);
155	}
156
157
158	/**
159	* Gets the address of a ring-0 memory object.
160	*
161	* @returns The address of the memory object.
162	* @returns NULL if the handle is invalid (asserts in strict builds) or if there isn't any mapping.
163	* @param MemObj The ring-0 memory object handle.
164	*/
165	RTR0DECL(void *) RTR0MemObjAddress(RTR0MEMOBJ MemObj)
166	{
167	/* Validate the object handle. */
168	PRTR0MEMOBJINTERNAL pMem;
169	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
170	return NULL;
171	AssertPtrReturn(MemObj, NULL);
172	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
173	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NULL);
174	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NULL);
175
176	/* return the mapping address. */
177	return pMem->pv;
178	}
179
180
181	/**
182	* Gets the ring-3 address of a ring-0 memory object.
183	*
184	* This only applies to ring-0 memory object with ring-3 mappings of some kind, i.e.
185	* locked user memory, reserved user address space and user mappings. This API should
186	* not be used on any other objects.
187	*
188	* @returns The address of the memory object.
189	* @returns NIL_RTR3PTR if the handle is invalid or if it's not an object with a ring-3 mapping.
190	* Strict builds will assert in both cases.
191	* @param MemObj The ring-0 memory object handle.
192	*/
193	RTR0DECL(RTR3PTR) RTR0MemObjAddressR3(RTR0MEMOBJ MemObj)
194	{
195	PRTR0MEMOBJINTERNAL pMem;
196
197	/* Validate the object handle. */
198	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
199	return NIL_RTR3PTR;
200	AssertPtrReturn(MemObj, NIL_RTR3PTR);
201	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
202	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NIL_RTR3PTR);
203	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NIL_RTR3PTR);
204	if (RT_UNLIKELY( ( pMem->enmType != RTR0MEMOBJTYPE_MAPPING
205	\|\| pMem->u.Mapping.R0Process == NIL_RTR0PROCESS)
206	&& ( pMem->enmType != RTR0MEMOBJTYPE_LOCK
207	\|\| pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
208	&& ( pMem->enmType != RTR0MEMOBJTYPE_PHYS_NC
209	\|\| pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
210	&& ( pMem->enmType != RTR0MEMOBJTYPE_RES_VIRT
211	\|\| pMem->u.ResVirt.R0Process == NIL_RTR0PROCESS)))
212	return NIL_RTR3PTR;
213
214	/* return the mapping address. */
215	return (RTR3PTR)pMem->pv;
216	}
217
218
219	/**
220	* Gets the size of a ring-0 memory object.
221	*
222	* @returns The address of the memory object.
223	* @returns 0 if the handle is invalid (asserts in strict builds) or if there isn't any mapping.
224	* @param MemObj The ring-0 memory object handle.
225	*/
226	RTR0DECL(size_t) RTR0MemObjSize(RTR0MEMOBJ MemObj)
227	{
228	PRTR0MEMOBJINTERNAL pMem;
229
230	/* Validate the object handle. */
231	if (RT_UNLIKELY(MemObj == NIL_RTR0MEMOBJ))
232	return 0;
233	AssertPtrReturn(MemObj, 0);
234	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
235	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), 0);
236	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), 0);
237
238	/* return the size. */
239	return pMem->cb;
240	}
241
242
243	/**
244	* Get the physical address of an page in the memory object.
245	*
246	* @returns The physical address.
247	* @returns NIL_RTHCPHYS if the object doesn't contain fixed physical pages.
248	* @returns NIL_RTHCPHYS if the iPage is out of range.
249	* @returns NIL_RTHCPHYS if the object handle isn't valid.
250	* @param MemObj The ring-0 memory object handle.
251	* @param iPage The page number within the object.
252	*/
253	RTR0DECL(RTHCPHYS) RTR0MemObjGetPagePhysAddr(RTR0MEMOBJ MemObj, size_t iPage)
254	{
255	/* Validate the object handle. */
256	PRTR0MEMOBJINTERNAL pMem;
257	size_t cPages;
258	AssertPtrReturn(MemObj, NIL_RTHCPHYS);
259	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
260	AssertReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, NIL_RTHCPHYS);
261	AssertReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, NIL_RTHCPHYS);
262	AssertMsgReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, ("%p: %#x\n", pMem, pMem->u32Magic), NIL_RTHCPHYS);
263	AssertMsgReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, ("%p: %d\n", pMem, pMem->enmType), NIL_RTHCPHYS);
264	cPages = (pMem->cb >> PAGE_SHIFT);
265	if (iPage >= cPages)
266	{
267	/* permit: while (RTR0MemObjGetPagePhysAddr(pMem, iPage++) != NIL_RTHCPHYS) {} */
268	if (iPage == cPages)
269	return NIL_RTHCPHYS;
270	AssertReturn(iPage < (pMem->cb >> PAGE_SHIFT), NIL_RTHCPHYS);
271	}
272
273	/*
274	* We know the address of physically contiguous allocations and mappings.
275	*/
276	if (pMem->enmType == RTR0MEMOBJTYPE_CONT)
277	return pMem->u.Cont.Phys + iPage * PAGE_SIZE;
278	if (pMem->enmType == RTR0MEMOBJTYPE_PHYS)
279	return pMem->u.Phys.PhysBase + iPage * PAGE_SIZE;
280
281	/*
282	* Do the job.
283	*/
284	return rtR0MemObjNativeGetPagePhysAddr(pMem, iPage);
285	}
286
287
288	/**
289	* Frees a ring-0 memory object.
290	*
291	* @returns IPRT status code.
292	* @retval VERR_INVALID_HANDLE if
293	* @param MemObj The ring-0 memory object to be freed. NULL is accepted.
294	* @param fFreeMappings Whether or not to free mappings of the object.
295	*/
296	RTR0DECL(int) RTR0MemObjFree(RTR0MEMOBJ MemObj, bool fFreeMappings)
297	{
298	/*
299	* Validate the object handle.
300	*/
301	PRTR0MEMOBJINTERNAL pMem;
302	int rc;
303
304	if (MemObj == NIL_RTR0MEMOBJ)
305	return VINF_SUCCESS;
306	AssertPtrReturn(MemObj, VERR_INVALID_HANDLE);
307	pMem = (PRTR0MEMOBJINTERNAL)MemObj;
308	AssertReturn(pMem->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
309	AssertReturn(pMem->enmType > RTR0MEMOBJTYPE_INVALID && pMem->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
310
311	/*
312	* Deal with mapings according to fFreeMappings.
313	*/
314	if ( !rtR0MemObjIsMapping(pMem)
315	&& pMem->uRel.Parent.cMappings > 0)
316	{
317	/* fail if not requested to free mappings. */
318	if (!fFreeMappings)
319	return VERR_MEMORY_BUSY;
320
321	while (pMem->uRel.Parent.cMappings > 0)
322	{
323	PRTR0MEMOBJINTERNAL pChild = pMem->uRel.Parent.papMappings[--pMem->uRel.Parent.cMappings];
324	pMem->uRel.Parent.papMappings[pMem->uRel.Parent.cMappings] = NULL;
325
326	/* sanity checks. */
327	AssertPtr(pChild);
328	AssertFatal(pChild->u32Magic == RTR0MEMOBJ_MAGIC);
329	AssertFatal(pChild->enmType > RTR0MEMOBJTYPE_INVALID && pChild->enmType < RTR0MEMOBJTYPE_END);
330	AssertFatal(rtR0MemObjIsMapping(pChild));
331
332	/* free the mapping. */
333	rc = rtR0MemObjNativeFree(pChild);
334	if (RT_FAILURE(rc))
335	{
336	Log(("RTR0MemObjFree: failed to free mapping %p: %p %#zx; rc=%Vrc\n", pChild, pChild->pv, pChild->cb, rc));
337	pMem->uRel.Parent.papMappings[pMem->uRel.Parent.cMappings++] = pChild;
338	return rc;
339	}
340	}
341	}
342
343	/*
344	* Free this object.
345	*/
346	rc = rtR0MemObjNativeFree(pMem);
347	if (RT_SUCCESS(rc))
348	{
349	/*
350	* Ok, it was freed just fine. Now, if it's a mapping we'll have to remove it from the parent.
351	*/
352	if (rtR0MemObjIsMapping(pMem))
353	{
354	PRTR0MEMOBJINTERNAL pParent = pMem->uRel.Child.pParent;
355	uint32_t i;
356
357	/* sanity checks */
358	AssertPtr(pParent);
359	AssertFatal(pParent->u32Magic == RTR0MEMOBJ_MAGIC);
360	AssertFatal(pParent->enmType > RTR0MEMOBJTYPE_INVALID && pParent->enmType < RTR0MEMOBJTYPE_END);
361	AssertFatal(!rtR0MemObjIsMapping(pParent));
362	AssertFatal(pParent->uRel.Parent.cMappings > 0);
363	AssertPtr(pParent->uRel.Parent.papMappings);
364
365	/* locate and remove from the array of mappings. */
366	i = pParent->uRel.Parent.cMappings;
367	while (i-- > 0)
368	{
369	if (pParent->uRel.Parent.papMappings[i] == pMem)
370	{
371	pParent->uRel.Parent.papMappings[i] = pParent->uRel.Parent.papMappings[--pParent->uRel.Parent.cMappings];
372	break;
373	}
374	}
375	Assert(i != UINT32_MAX);
376	}
377	else
378	Assert(pMem->uRel.Parent.cMappings == 0);
379
380	/*
381	* Finally, destroy the handle.
382	*/
383	pMem->u32Magic++;
384	pMem->enmType = RTR0MEMOBJTYPE_END;
385	if (!rtR0MemObjIsMapping(pMem))
386	RTMemFree(pMem->uRel.Parent.papMappings);
387	RTMemFree(pMem);
388	}
389	else
390	Log(("RTR0MemObjFree: failed to free %p: %d %p %#zx; rc=%Vrc\n",
391	pMem, pMem->enmType, pMem->pv, pMem->cb, rc));
392	return rc;
393	}
394
395
396
397	/**
398	* Allocates page aligned virtual kernel memory.
399	*
400	* The memory is taken from a non paged (= fixed physical memory backing) pool.
401	*
402	* @returns IPRT status code.
403	* @param pMemObj Where to store the ring-0 memory object handle.
404	* @param cb Number of bytes to allocate. This is rounded up to nearest page.
405	* @param fExecutable Flag indicating whether it should be permitted to executed code in the memory object.
406	*/
407	RTR0DECL(int) RTR0MemObjAllocPage(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable)
408	{
409	/* sanity checks. */
410	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
411	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
412	*pMemObj = NIL_RTR0MEMOBJ;
413	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
414	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
415
416	/* do the allocation. */
417	return rtR0MemObjNativeAllocPage(pMemObj, cbAligned, fExecutable);
418	}
419
420
421	/**
422	* Allocates page aligned virtual kernel memory with physical backing below 4GB.
423	*
424	* The physical memory backing the allocation is fixed.
425	*
426	* @returns IPRT status code.
427	* @param pMemObj Where to store the ring-0 memory object handle.
428	* @param cb Number of bytes to allocate. This is rounded up to nearest page.
429	* @param fExecutable Flag indicating whether it should be permitted to executed code in the memory object.
430	*/
431	RTR0DECL(int) RTR0MemObjAllocLow(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable)
432	{
433	/* sanity checks. */
434	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
435	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
436	*pMemObj = NIL_RTR0MEMOBJ;
437	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
438	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
439
440	/* do the allocation. */
441	return rtR0MemObjNativeAllocLow(pMemObj, cbAligned, fExecutable);
442	}
443
444
445	/**
446	* Allocates page aligned virtual kernel memory with contiguous physical backing below 4GB.
447	*
448	* The physical memory backing the allocation is fixed.
449	*
450	* @returns IPRT status code.
451	* @param pMemObj Where to store the ring-0 memory object handle.
452	* @param cb Number of bytes to allocate. This is rounded up to nearest page.
453	* @param fExecutable Flag indicating whether it should be permitted to executed code in the memory object.
454	*/
455	RTR0DECL(int) RTR0MemObjAllocCont(PRTR0MEMOBJ pMemObj, size_t cb, bool fExecutable)
456	{
457	/* sanity checks. */
458	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
459	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
460	*pMemObj = NIL_RTR0MEMOBJ;
461	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
462	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
463
464	/* do the allocation. */
465	return rtR0MemObjNativeAllocCont(pMemObj, cbAligned, fExecutable);
466	}
467
468
469	/**
470	* Locks a range of user virtual memory.
471	*
472	* @returns IPRT status code.
473	* @param pMemObj Where to store the ring-0 memory object handle.
474	* @param R3Ptr User virtual address. This is rounded down to a page boundrary.
475	* @param cb Number of bytes to lock. This is rounded up to nearest page boundrary.
476	* @param R0Process The process to lock pages in. NIL_R0PROCESS is an alias for the current one.
477	*
478	* @remark RTR0MemGetAddressR3() and RTR0MemGetAddress() will return the rounded down address.
479	*/
480	RTR0DECL(int) RTR0MemObjLockUser(PRTR0MEMOBJ pMemObj, RTR3PTR R3Ptr, size_t cb, RTR0PROCESS R0Process)
481	{
482	/* sanity checks. */
483	const size_t cbAligned = RT_ALIGN_Z(cb + (R3Ptr & PAGE_OFFSET_MASK), PAGE_SIZE);
484	RTR3PTR const R3PtrAligned = (R3Ptr & ~(RTR3PTR)PAGE_OFFSET_MASK);
485	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
486	*pMemObj = NIL_RTR0MEMOBJ;
487	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
488	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
489	if (R0Process == NIL_RTR0PROCESS)
490	R0Process = RTR0ProcHandleSelf();
491
492	/* do the locking. */
493	return rtR0MemObjNativeLockUser(pMemObj, R3PtrAligned, cbAligned, R0Process);
494	}
495
496
497	/**
498	* Locks a range of kernel virtual memory.
499	*
500	* @returns IPRT status code.
501	* @param pMemObj Where to store the ring-0 memory object handle.
502	* @param pv Kernel virtual address. This is rounded down to a page boundrary.
503	* @param cb Number of bytes to lock. This is rounded up to nearest page boundrary.
504	*
505	* @remark RTR0MemGetAddress() will return the rounded down address.
506	*/
507	RTR0DECL(int) RTR0MemObjLockKernel(PRTR0MEMOBJ pMemObj, void *pv, size_t cb)
508	{
509	/* sanity checks. */
510	const size_t cbAligned = RT_ALIGN_Z(cb + ((uintptr_t)pv & PAGE_OFFSET_MASK), PAGE_SIZE);
511	void * const pvAligned = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK);
512	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
513	*pMemObj = NIL_RTR0MEMOBJ;
514	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
515	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
516	AssertPtrReturn(pvAligned, VERR_INVALID_POINTER);
517
518	/* do the allocation. */
519	return rtR0MemObjNativeLockKernel(pMemObj, pvAligned, cbAligned);
520	}
521
522
523	/**
524	* Allocates contiguous page aligned physical memory without (necessarily) any kernel mapping.
525	*
526	* @returns IPRT status code.
527	* @param pMemObj Where to store the ring-0 memory object handle.
528	* @param cb Number of bytes to allocate. This is rounded up to nearest page.
529	* @param PhysHighest The highest permittable address (inclusive).
530	* Pass NIL_RTHCPHYS if any address is acceptable.
531	*/
532	RTR0DECL(int) RTR0MemObjAllocPhys(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest)
533	{
534	/* sanity checks. */
535	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
536	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
537	*pMemObj = NIL_RTR0MEMOBJ;
538	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
539	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
540	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
541
542	/* do the allocation. */
543	return rtR0MemObjNativeAllocPhys(pMemObj, cbAligned, PhysHighest);
544	}
545
546
547	/**
548	* Allocates non-contiguous page aligned physical memory without (necessarily) any kernel mapping.
549	*
550	* @returns IPRT status code.
551	* @param pMemObj Where to store the ring-0 memory object handle.
552	* @param cb Number of bytes to allocate. This is rounded up to nearest page.
553	* @param PhysHighest The highest permittable address (inclusive).
554	* Pass NIL_RTHCPHYS if any address is acceptable.
555	*/
556	RTR0DECL(int) RTR0MemObjAllocPhysNC(PRTR0MEMOBJ pMemObj, size_t cb, RTHCPHYS PhysHighest)
557	{
558	/* sanity checks. */
559	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
560	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
561	*pMemObj = NIL_RTR0MEMOBJ;
562	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
563	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
564	AssertReturn(PhysHighest >= cb, VERR_INVALID_PARAMETER);
565
566	/* do the allocation. */
567	return rtR0MemObjNativeAllocPhysNC(pMemObj, cbAligned, PhysHighest);
568	}
569
570
571	/**
572	* Creates a page aligned, contiguous, physical memory object.
573	*
574	* No physical memory is allocated, we trust you do know what you're doing.
575	*
576	* @returns IPRT status code.
577	* @param pMemObj Where to store the ring-0 memory object handle.
578	* @param Phys The physical address to start at. This is rounded down to the
579	* nearest page boundrary.
580	* @param cb The size of the object in bytes. This is rounded up to nearest page boundrary.
581	*/
582	RTR0DECL(int) RTR0MemObjEnterPhys(PRTR0MEMOBJ pMemObj, RTHCPHYS Phys, size_t cb)
583	{
584	/* sanity checks. */
585	const size_t cbAligned = RT_ALIGN_Z(cb + (Phys & PAGE_OFFSET_MASK), PAGE_SIZE);
586	const RTHCPHYS PhysAligned = Phys & ~(RTHCPHYS)PAGE_OFFSET_MASK;
587	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
588	*pMemObj = NIL_RTR0MEMOBJ;
589	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
590	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
591	AssertReturn(Phys != NIL_RTHCPHYS, VERR_INVALID_PARAMETER);
592
593	/* do the allocation. */
594	return rtR0MemObjNativeEnterPhys(pMemObj, PhysAligned, cbAligned);
595	}
596
597
598	/**
599	* Reserves kernel virtual address space.
600	*
601	* @returns IPRT status code.
602	* @param pMemObj Where to store the ring-0 memory object handle.
603	* @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment.
604	* @param cb The number of bytes to reserve. This is rounded up to nearest page.
605	* @param uAlignment The alignment of the reserved memory.
606	* Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M.
607	*/
608	RTR0DECL(int) RTR0MemObjReserveKernel(PRTR0MEMOBJ pMemObj, void *pvFixed, size_t cb, size_t uAlignment)
609	{
610	/* sanity checks. */
611	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
612	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
613	*pMemObj = NIL_RTR0MEMOBJ;
614	if (uAlignment == 0)
615	uAlignment = PAGE_SIZE;
616	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
617	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
618	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
619	if (pvFixed != (void *)-1)
620	AssertReturn(!((uintptr_t)pvFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
621
622	/* do the reservation. */
623	return rtR0MemObjNativeReserveKernel(pMemObj, pvFixed, cbAligned, uAlignment);
624	}
625
626
627	/**
628	* Reserves user virtual address space in the current process.
629	*
630	* @returns IPRT status code.
631	* @param pMemObj Where to store the ring-0 memory object handle.
632	* @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment.
633	* @param cb The number of bytes to reserve. This is rounded up to nearest PAGE_SIZE.
634	* @param uAlignment The alignment of the reserved memory.
635	* Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M.
636	* @param R0Process The process to reserve the memory in. NIL_R0PROCESS is an alias for the current one.
637	*/
638	RTR0DECL(int) RTR0MemObjReserveUser(PRTR0MEMOBJ pMemObj, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, RTR0PROCESS R0Process)
639	{
640	/* sanity checks. */
641	const size_t cbAligned = RT_ALIGN_Z(cb, PAGE_SIZE);
642	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
643	*pMemObj = NIL_RTR0MEMOBJ;
644	if (uAlignment == 0)
645	uAlignment = PAGE_SIZE;
646	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
647	AssertReturn(cb > 0, VERR_INVALID_PARAMETER);
648	AssertReturn(cb <= cbAligned, VERR_INVALID_PARAMETER);
649	if (R3PtrFixed != (RTR3PTR)-1)
650	AssertReturn(!(R3PtrFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
651	if (R0Process == NIL_RTR0PROCESS)
652	R0Process = RTR0ProcHandleSelf();
653
654	/* do the reservation. */
655	return rtR0MemObjNativeReserveUser(pMemObj, R3PtrFixed, cbAligned, uAlignment, R0Process);
656	}
657
658
659	/**
660	* Maps a memory object into kernel virtual address space.
661	*
662	* @returns IPRT status code.
663	* @param pMemObj Where to store the ring-0 memory object handle of the mapping object.
664	* @param MemObjToMap The object to be map.
665	* @param pvFixed Requested address. (void *)-1 means any address. This must match the alignment.
666	* @param uAlignment The alignment of the reserved memory.
667	* Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M.
668	* @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE).
669	*/
670	RTR0DECL(int) RTR0MemObjMapKernel(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, void *pvFixed, size_t uAlignment, unsigned fProt)
671	{
672	/* sanity checks. */
673	PRTR0MEMOBJINTERNAL pMemToMap;
674	PRTR0MEMOBJINTERNAL pNew;
675	int rc;
676	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
677	*pMemObj = NIL_RTR0MEMOBJ;
678	AssertPtrReturn(MemObjToMap, VERR_INVALID_HANDLE);
679	pMemToMap = (PRTR0MEMOBJINTERNAL)MemObjToMap;
680	AssertReturn(pMemToMap->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
681	AssertReturn(pMemToMap->enmType > RTR0MEMOBJTYPE_INVALID && pMemToMap->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
682	AssertReturn(!rtR0MemObjIsMapping(pMemToMap), VERR_INVALID_PARAMETER);
683	AssertReturn(pMemToMap->enmType != RTR0MEMOBJTYPE_RES_VIRT, VERR_INVALID_PARAMETER);
684	if (uAlignment == 0)
685	uAlignment = PAGE_SIZE;
686	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
687	if (pvFixed != (void *)-1)
688	AssertReturn(!((uintptr_t)pvFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
689	AssertReturn(fProt != RTMEM_PROT_NONE, VERR_INVALID_PARAMETER);
690	AssertReturn(!(fProt & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC)), VERR_INVALID_PARAMETER);
691
692
693	/* do the mapping. */
694	rc = rtR0MemObjNativeMapKernel(&pNew, pMemToMap, pvFixed, uAlignment, fProt);
695	if (RT_SUCCESS(rc))
696	{
697	/* link it. */
698	rc = rtR0MemObjLink(pMemToMap, pNew);
699	if (RT_SUCCESS(rc))
700	*pMemObj = pNew;
701	else
702	{
703	/* damn, out of memory. bail out. */
704	int rc2 = rtR0MemObjNativeFree(pNew);
705	AssertRC(rc2);
706	pNew->u32Magic++;
707	pNew->enmType = RTR0MEMOBJTYPE_END;
708	RTMemFree(pNew);
709	}
710	}
711
712	return rc;
713	}
714
715
716	/**
717	* Maps a memory object into user virtual address space in the current process.
718	*
719	* @returns IPRT status code.
720	* @param pMemObj Where to store the ring-0 memory object handle of the mapping object.
721	* @param MemObjToMap The object to be map.
722	* @param R3PtrFixed Requested address. (RTR3PTR)-1 means any address. This must match the alignment.
723	* @param uAlignment The alignment of the reserved memory.
724	* Supported values are 0 (alias for PAGE_SIZE), PAGE_SIZE, _2M and _4M.
725	* @param fProt Combination of RTMEM_PROT_* flags (except RTMEM_PROT_NONE).
726	* @param R0Process The process to map the memory into. NIL_R0PROCESS is an alias for the current one.
727	*/
728	RTR0DECL(int) RTR0MemObjMapUser(PRTR0MEMOBJ pMemObj, RTR0MEMOBJ MemObjToMap, RTR3PTR R3PtrFixed, size_t uAlignment, unsigned fProt, RTR0PROCESS R0Process)
729	{
730	/* sanity checks. */
731	PRTR0MEMOBJINTERNAL pMemToMap;
732	PRTR0MEMOBJINTERNAL pNew;
733	int rc;
734	AssertPtrReturn(pMemObj, VERR_INVALID_POINTER);
735	pMemToMap = (PRTR0MEMOBJINTERNAL)MemObjToMap;
736	*pMemObj = NIL_RTR0MEMOBJ;
737	AssertPtrReturn(MemObjToMap, VERR_INVALID_HANDLE);
738	AssertReturn(pMemToMap->u32Magic == RTR0MEMOBJ_MAGIC, VERR_INVALID_HANDLE);
739	AssertReturn(pMemToMap->enmType > RTR0MEMOBJTYPE_INVALID && pMemToMap->enmType < RTR0MEMOBJTYPE_END, VERR_INVALID_HANDLE);
740	AssertReturn(!rtR0MemObjIsMapping(pMemToMap), VERR_INVALID_PARAMETER);
741	AssertReturn(pMemToMap->enmType != RTR0MEMOBJTYPE_RES_VIRT, VERR_INVALID_PARAMETER);
742	if (uAlignment == 0)
743	uAlignment = PAGE_SIZE;
744	AssertReturn(uAlignment == PAGE_SIZE \|\| uAlignment == _2M \|\| uAlignment == _4M, VERR_INVALID_PARAMETER);
745	if (R3PtrFixed != (RTR3PTR)-1)
746	AssertReturn(!(R3PtrFixed & (uAlignment - 1)), VERR_INVALID_PARAMETER);
747	AssertReturn(fProt != RTMEM_PROT_NONE, VERR_INVALID_PARAMETER);
748	AssertReturn(!(fProt & ~(RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC)), VERR_INVALID_PARAMETER);
749	if (R0Process == NIL_RTR0PROCESS)
750	R0Process = RTR0ProcHandleSelf();
751
752	/* do the mapping. */
753	rc = rtR0MemObjNativeMapUser(&pNew, pMemToMap, R3PtrFixed, uAlignment, fProt, R0Process);
754	if (RT_SUCCESS(rc))
755	{
756	/* link it. */
757	rc = rtR0MemObjLink(pMemToMap, pNew);
758	if (RT_SUCCESS(rc))
759	*pMemObj = pNew;
760	else
761	{
762	/* damn, out of memory. bail out. */
763	int rc2 = rtR0MemObjNativeFree(pNew);
764	AssertRC(rc2);
765	pNew->u32Magic++;
766	pNew->enmType = RTR0MEMOBJTYPE_END;
767	RTMemFree(pNew);
768	}
769	}
770
771	return rc;
772	}
773

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source: vbox/trunk/src/VBox/Runtime/r0drv/memobj-r0drv.cpp@ 8217

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