MMAllHyper.cpp@ 5629

Last change on this file since 5629 was 5606, checked in by vboxsync, 17 years ago
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1	/* $Id: MMAllHyper.cpp 5606 2007-11-01 19:43:40Z vboxsync $ */
2	/** @file
3	* MM - Memory Monitor(/Manager) - Hypervisor Memory Area, All Contexts.
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_HYPER_HEAP
23	#include <VBox/mm.h>
24	#include <VBox/stam.h>
25	#include "MMInternal.h"
26	#include <VBox/vm.h>
27
28	#include <VBox/err.h>
29	#include <VBox/param.h>
30	#include <iprt/assert.h>
31	#include <VBox/log.h>
32	#include <iprt/asm.h>
33	#include <iprt/string.h>
34
35
36	/*******************************************************************************
37	* Defined Constants And Macros *
38	*******************************************************************************/
39	#ifdef DEBUG
40	# define MMHYPER_HEAP_STRICT 1
41	#endif
42
43	#define ASSERT_L(u1, u2) AssertMsg((u1) < (u2), ("u1=%#x u2=%#x\n", u1, u2))
44	#define ASSERT_LE(u1, u2) AssertMsg((u1) <= (u2), ("u1=%#x u2=%#x\n", u1, u2))
45	#define ASSERT_GE(u1, u2) AssertMsg((u1) >= (u2), ("u1=%#x u2=%#x\n", u1, u2))
46	#define ASSERT_ALIGN(u1) AssertMsg(!((u1) & (MMHYPER_HEAP_ALIGN_MIN - 1)), ("u1=%#x (%d)\n", u1, u1))
47
48	#define ASSERT_OFFPREV(pHeap, pChunk) \
49	do { Assert(MMHYPERCHUNK_GET_OFFPREV(pChunk) <= 0); \
50	Assert(MMHYPERCHUNK_GET_OFFPREV(pChunk) >= (intptr_t)CTXSUFF((pHeap)->pbHeap) - (intptr_t)(pChunk)); \
51	AssertMsg( MMHYPERCHUNK_GET_OFFPREV(pChunk) != 0 \
52	\|\| (uint8_t *)(pChunk) == CTXSUFF((pHeap)->pbHeap), \
53	("pChunk=%p pvHyperHeap=%p\n", (pChunk), CTXSUFF((pHeap)->pbHeap))); \
54	} while (0)
55
56	#define ASSERT_OFFNEXT(pHeap, pChunk) \
57	do { ASSERT_ALIGN((pChunk)->offNext); \
58	ASSERT_L((pChunk)->offNext, (uintptr_t)CTXSUFF((pHeap)->pbHeap) + (pHeap)->offPageAligned - (uintptr_t)(pChunk)); \
59	} while (0)
60
61	#define ASSERT_OFFHEAP(pHeap, pChunk) \
62	do { Assert((pChunk)->offHeap); \
63	AssertMsg((PMMHYPERHEAP)((pChunk)->offHeap + (uintptr_t)pChunk) == (pHeap), \
64	("offHeap=%RX32 pChunk=%p pHeap=%p\n", (pChunk)->offHeap, (pChunk), (pHeap))); \
65	Assert((pHeap)->u32Magic == MMHYPERHEAP_MAGIC); \
66	} while (0)
67
68	#ifdef VBOX_WITH_STATISTICS
69	#define ASSERT_OFFSTAT(pHeap, pChunk) \
70	do { if (MMHYPERCHUNK_ISFREE(pChunk)) \
71	Assert(!(pChunk)->offStat); \
72	else if ((pChunk)->offStat) \
73	{ \
74	Assert((pChunk)->offStat); \
75	AssertMsg(!((pChunk)->offStat & (MMHYPER_HEAP_ALIGN_MIN - 1)), ("offStat=%RX32\n", (pChunk)->offStat)); \
76	uintptr_t uPtr = (uintptr_t)(pChunk)->offStat + (uintptr_t)pChunk; NOREF(uPtr); \
77	AssertMsg(uPtr - (uintptr_t)CTXSUFF((pHeap)->pbHeap) < (pHeap)->offPageAligned, \
78	("%p - %p < %RX32\n", uPtr, CTXSUFF((pHeap)->pbHeap), (pHeap)->offPageAligned)); \
79	} \
80	} while (0)
81	#else
82	#define ASSERT_OFFSTAT(pHeap, pChunk) \
83	do { Assert(!(pChunk)->offStat); \
84	} while (0)
85	#endif
86
87	#define ASSERT_CHUNK(pHeap, pChunk) \
88	do { ASSERT_OFFNEXT(pHeap, pChunk); \
89	ASSERT_OFFPREV(pHeap, pChunk); \
90	ASSERT_OFFHEAP(pHeap, pChunk); \
91	ASSERT_OFFSTAT(pHeap, pChunk); \
92	} while (0)
93	#define ASSERT_CHUNK_USED(pHeap, pChunk) \
94	do { ASSERT_OFFNEXT(pHeap, pChunk); \
95	ASSERT_OFFPREV(pHeap, pChunk); \
96	Assert(MMHYPERCHUNK_ISUSED(pChunk)); \
97	} while (0)
98
99	#define ASSERT_FREE_OFFPREV(pHeap, pChunk) \
100	do { ASSERT_ALIGN((pChunk)->offPrev); \
101	ASSERT_GE(((pChunk)->offPrev & (MMHYPER_HEAP_ALIGN_MIN - 1)), (intptr_t)CTXSUFF((pHeap)->pbHeap) - (intptr_t)(pChunk)); \
102	Assert((pChunk)->offPrev != MMHYPERCHUNK_GET_OFFPREV(&(pChunk)->core) \|\| !(pChunk)->offPrev); \
103	AssertMsg( (pChunk)->offPrev \
104	\|\| (uintptr_t)(pChunk) - (uintptr_t)CTXSUFF((pHeap)->pbHeap) == (pHeap)->offFreeHead, \
105	("pChunk=%p offChunk=%#x offFreeHead=%#x\n", (pChunk), (uintptr_t)(pChunk) - (uintptr_t)CTXSUFF((pHeap)->pbHeap),\
106	(pHeap)->offFreeHead)); \
107	} while (0)
108
109	#define ASSERT_FREE_OFFNEXT(pHeap, pChunk) \
110	do { ASSERT_ALIGN((pChunk)->offNext); \
111	ASSERT_L((pChunk)->offNext, (uintptr_t)CTXSUFF((pHeap)->pbHeap) + (pHeap)->offPageAligned - (uintptr_t)(pChunk)); \
112	Assert((pChunk)->offNext != (pChunk)->core.offNext \|\| !(pChunk)->offNext); \
113	AssertMsg( (pChunk)->offNext \
114	\|\| (uintptr_t)(pChunk) - (uintptr_t)CTXSUFF((pHeap)->pbHeap) == (pHeap)->offFreeTail, \
115	("pChunk=%p offChunk=%#x offFreeTail=%#x\n", (pChunk), (uintptr_t)(pChunk) - (uintptr_t)CTXSUFF((pHeap)->pbHeap), \
116	(pHeap)->offFreeTail)); \
117	} while (0)
118
119	#define ASSERT_FREE_CB(pHeap, pChunk) \
120	do { ASSERT_ALIGN((pChunk)->cb); \
121	Assert((pChunk)->cb > 0); \
122	if ((pChunk)->core.offNext) \
123	AssertMsg((pChunk)->cb == ((pChunk)->core.offNext - sizeof(MMHYPERCHUNK)), \
124	("cb=%d offNext=%d\n", (pChunk)->cb, (pChunk)->core.offNext)); \
125	else \
126	ASSERT_LE((pChunk)->cb, (uintptr_t)CTXSUFF((pHeap)->pbHeap) + (pHeap)->offPageAligned - (uintptr_t)(pChunk)); \
127	} while (0)
128
129	#define ASSERT_CHUNK_FREE(pHeap, pChunk) \
130	do { ASSERT_CHUNK(pHeap, &(pChunk)->core); \
131	Assert(MMHYPERCHUNK_ISFREE(pChunk)); \
132	ASSERT_FREE_OFFNEXT(pHeap, pChunk); \
133	ASSERT_FREE_OFFPREV(pHeap, pChunk); \
134	ASSERT_FREE_CB(pHeap, pChunk); \
135	} while (0)
136
137
138	/*******************************************************************************
139	* Internal Functions *
140	*******************************************************************************/
141	static PMMHYPERCHUNK mmHyperAllocChunk(PMMHYPERHEAP pHeap, uint32_t cb, unsigned uAlignment);
142	static void *mmHyperAllocPages(PMMHYPERHEAP pHeap, uint32_t cb);
143	#ifdef VBOX_WITH_STATISTICS
144	static PMMHYPERSTAT mmHyperStat(PMMHYPERHEAP pHeap, MMTAG enmTag);
145	#ifdef IN_RING3
146	static void mmR3HyperStatRegisterOne(PVM pVM, PMMHYPERSTAT pStat);
147	#endif
148	#endif
149	static int mmHyperFree(PMMHYPERHEAP pHeap, PMMHYPERCHUNK pChunk);
150	#ifdef MMHYPER_HEAP_STRICT
151	static void mmr3HyperHeapCheck(PMMHYPERHEAP pHeap);
152	#endif
153
154
155	/**
156	* Allocates memory in the Hypervisor (GC VMM) area.
157	* The returned memory is of course zeroed.
158	*
159	* @returns VBox status code.
160	* @param pVM The VM to operate on.
161	* @param cb Number of bytes to allocate.
162	* @param uAlignment Required memory alignment in bytes.
163	* Values are 0,8,16,32 and PAGE_SIZE.
164	* 0 -> default alignment, i.e. 8 bytes.
165	* @param enmTag The statistics tag.
166	* @param ppv Where to store the address to the allocated
167	* memory.
168	* @remark This is assumed not to be used at times when serialization is required.
169	*/
170	MMDECL(int) MMHyperAlloc(PVM pVM, size_t cb, unsigned uAlignment, MMTAG enmTag, void **ppv)
171	{
172	AssertMsg(cb >= 8, ("Hey! Do you really mean to allocate less than 8 bytes?! cb=%d\n", cb));
173
174	/*
175	* Validate input and adjust it to reasonable values.
176	*/
177	if (!uAlignment \|\| uAlignment < MMHYPER_HEAP_ALIGN_MIN)
178	uAlignment = MMHYPER_HEAP_ALIGN_MIN;
179	uint32_t cbAligned;
180	switch (uAlignment)
181	{
182	case 8:
183	case 16:
184	case 32:
185	cbAligned = RT_ALIGN(cb, MMHYPER_HEAP_ALIGN_MIN);
186	if (!cbAligned \|\| cbAligned < cb)
187	{
188	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VERR_INVALID_PARAMETER\n", cb, uAlignment));
189	AssertMsgFailed(("Nice try.\n"));
190	return VERR_INVALID_PARAMETER;
191	}
192	break;
193
194	case PAGE_SIZE:
195	AssertMsg(RT_ALIGN(cb, PAGE_SIZE) == cb, ("The size isn't page aligned. (cb=%#x)\n", cb));
196	cbAligned = RT_ALIGN(cb, PAGE_SIZE);
197	if (!cbAligned)
198	{
199	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VERR_INVALID_PARAMETER\n", cb, uAlignment));
200	AssertMsgFailed(("Nice try.\n"));
201	return VERR_INVALID_PARAMETER;
202	}
203	break;
204
205	default:
206	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VERR_INVALID_PARAMETER\n", cb, uAlignment));
207	AssertMsgFailed(("Invalid alignment %u\n", uAlignment));
208	return VERR_INVALID_PARAMETER;
209	}
210
211
212	/*
213	* Get heap and statisticsStatistics.
214	*/
215	PMMHYPERHEAP pHeap = CTXSUFF(pVM->mm.s.pHyperHeap);
216	#ifdef VBOX_WITH_STATISTICS
217	PMMHYPERSTAT pStat = mmHyperStat(pHeap, enmTag);
218	if (!pStat)
219	{
220	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VERR_MM_HYPER_NO_MEMORY\n", cb, uAlignment));
221	AssertMsgFailed(("Failed to allocate statistics!\n"));
222	return VERR_MM_HYPER_NO_MEMORY;
223	}
224	#endif
225	if (uAlignment < PAGE_SIZE)
226	{
227	/*
228	* Allocate a chunk.
229	*/
230	PMMHYPERCHUNK pChunk = mmHyperAllocChunk(pHeap, cbAligned, uAlignment);
231	if (pChunk)
232	{
233	#ifdef VBOX_WITH_STATISTICS
234	const uint32_t cbChunk = pChunk->offNext
235	? pChunk->offNext
236	: CTXSUFF(pHeap->pbHeap) + pHeap->offPageAligned - (uint8_t *)pChunk;
237	pStat->cbAllocated += (uint32_t)cbChunk;
238	pStat->cbCurAllocated += (uint32_t)cbChunk;
239	if (pStat->cbCurAllocated > pStat->cbMaxAllocated)
240	pStat->cbMaxAllocated = pStat->cbCurAllocated;
241	pStat->cAllocations++;
242	pChunk->offStat = (uintptr_t)pStat - (uintptr_t)pChunk;
243	#else
244	pChunk->offStat = 0;
245	#endif
246	void *pv = pChunk + 1;
247	*ppv = pv;
248	ASMMemZero32(pv, cbAligned);
249	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VINF_SUCCESS and *ppv=%p\n", cb, uAlignment, pv));
250	return VINF_SUCCESS;
251	}
252	}
253	else
254	{
255	/*
256	* Allocate page aligned memory.
257	*/
258	void *pv = mmHyperAllocPages(pHeap, cbAligned);
259	if (pv)
260	{
261	#ifdef VBOX_WITH_STATISTICS
262	pStat->cbAllocated += cbAligned;
263	pStat->cbCurAllocated += cbAligned;
264	if (pStat->cbCurAllocated > pStat->cbMaxAllocated)
265	pStat->cbMaxAllocated = pStat->cbCurAllocated;
266	pStat->cAllocations++;
267	#endif
268	*ppv = pv;
269	/* ASMMemZero32(pv, cbAligned); - not required since memory is alloc-only and SUPPageAlloc zeros it. */
270	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VINF_SUCCESS and *ppv=%p\n", cb, uAlignment, ppv));
271	return VINF_SUCCESS;
272	}
273	}
274
275	#ifdef VBOX_WITH_STATISTICS
276	pStat->cAllocations++;
277	pStat->cFailures++;
278	#endif
279	Log2(("MMHyperAlloc: cb=%#x uAlignment=%#x returns VERR_MM_HYPER_NO_MEMORY\n", cb, uAlignment));
280	AssertMsgFailed(("Failed to allocate %d bytes!\n", cb));
281	return VERR_MM_HYPER_NO_MEMORY;
282	}
283
284
285
286	/**
287	* Allocates a chunk of memory from the specified heap.
288	* The caller validates the parameters of this request.
289	*
290	* @returns Pointer to the allocated chunk.
291	* @returns NULL on failure.
292	* @param pHeap The heap.
293	* @param cb Size of the memory block to allocate.
294	* @param uAlignment The alignment specifications for the allocated block.
295	* @internal
296	*/
297	static PMMHYPERCHUNK mmHyperAllocChunk(PMMHYPERHEAP pHeap, uint32_t cb, unsigned uAlignment)
298	{
299	Log3(("mmHyperAllocChunk: Enter cb=%#x uAlignment=%#x\n", cb, uAlignment));
300	#ifdef MMHYPER_HEAP_STRICT
301	mmr3HyperHeapCheck(pHeap);
302	#endif
303
304	/*
305	* Check if there are any free chunks. (NIL_OFFSET use/not-use forces this check)
306	*/
307	if (pHeap->offFreeHead == NIL_OFFSET)
308	return NULL;
309
310	/*
311	* Small alignments - from the front of the heap.
312	*
313	* Must split off free chunks at the end to prevent messing up the
314	* last free node which we take the page aligned memory from the top of.
315	*/
316	PMMHYPERCHUNK pRet = NULL;
317	PMMHYPERCHUNKFREE pFree = (PMMHYPERCHUNKFREE)((char *)CTXSUFF(pHeap->pbHeap) + pHeap->offFreeHead);
318	while (pFree)
319	{
320	ASSERT_CHUNK_FREE(pHeap, pFree);
321	if (pFree->cb >= cb)
322	{
323	unsigned offAlign = (uintptr_t)(&pFree->core + 1) & (uAlignment - 1);
324	if (offAlign)
325	offAlign = uAlignment - offAlign;
326	if (!offAlign \|\| pFree->cb - offAlign >= cb)
327	{
328	Log3(("mmHyperAllocChunk: Using pFree=%p pFree->cb=%d offAlign=%d\n", pFree, pFree->cb, offAlign));
329
330	/*
331	* Adjust the node in front.
332	* Because of multiple alignments we need to special case allocation of the first block.
333	*/
334	if (offAlign)
335	{
336	MMHYPERCHUNKFREE Free = *pFree;
337	if (MMHYPERCHUNK_GET_OFFPREV(&pFree->core))
338	{
339	/* just add a bit of memory to it. */
340	PMMHYPERCHUNKFREE pPrev = (PMMHYPERCHUNKFREE)((char *)pFree + MMHYPERCHUNK_GET_OFFPREV(&Free.core));
341	pPrev->core.offNext += offAlign;
342	AssertMsg(!MMHYPERCHUNK_ISFREE(&pPrev->core), ("Impossible!\n"));
343	Log3(("mmHyperAllocChunk: Added %d bytes to %p\n", offAlign, pPrev));
344	}
345	else
346	{
347	/* make new head node, mark it USED for simplisity. */
348	PMMHYPERCHUNK pPrev = (PMMHYPERCHUNK)CTXSUFF(pHeap->pbHeap);
349	Assert(pPrev == &pFree->core);
350	pPrev->offPrev = 0;
351	MMHYPERCHUNK_SET_TYPE(pPrev, MMHYPERCHUNK_FLAGS_USED);
352	pPrev->offNext = offAlign;
353	Log3(("mmHyperAllocChunk: Created new first node of %d bytes\n", offAlign));
354
355	}
356	Log3(("mmHyperAllocChunk: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree - offAlign, -(int)offAlign));
357	pHeap->cbFree -= offAlign;
358
359	/* Recreate pFree node and adjusting everything... */
360	pFree = (PMMHYPERCHUNKFREE)((char *)pFree + offAlign);
361	*pFree = Free;
362
363	pFree->cb -= offAlign;
364	if (pFree->core.offNext)
365	{
366	pFree->core.offNext -= offAlign;
367	PMMHYPERCHUNK pNext = (PMMHYPERCHUNK)((char *)pFree + pFree->core.offNext);
368	MMHYPERCHUNK_SET_OFFPREV(pNext, -(int32_t)pFree->core.offNext);
369	ASSERT_CHUNK(pHeap, pNext);
370	}
371	if (MMHYPERCHUNK_GET_OFFPREV(&pFree->core))
372	MMHYPERCHUNK_SET_OFFPREV(&pFree->core, MMHYPERCHUNK_GET_OFFPREV(&pFree->core) - offAlign);
373
374	if (pFree->offNext)
375	{
376	pFree->offNext -= offAlign;
377	PMMHYPERCHUNKFREE pNext = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offNext);
378	pNext->offPrev = -(int32_t)pFree->offNext;
379	ASSERT_CHUNK_FREE(pHeap, pNext);
380	}
381	else
382	pHeap->offFreeTail += offAlign;
383	if (pFree->offPrev)
384	{
385	pFree->offPrev -= offAlign;
386	PMMHYPERCHUNKFREE pPrev = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offPrev);
387	pPrev->offNext = -pFree->offPrev;
388	ASSERT_CHUNK_FREE(pHeap, pPrev);
389	}
390	else
391	pHeap->offFreeHead += offAlign;
392	pFree->core.offHeap = (uintptr_t)pHeap - (uintptr_t)pFree;
393	pFree->core.offStat = 0;
394	ASSERT_CHUNK_FREE(pHeap, pFree);
395	Log3(("mmHyperAllocChunk: Realigned pFree=%p\n", pFree));
396	}
397
398	/*
399	* Split off a new FREE chunk?
400	*/
401	if (pFree->cb >= cb + RT_ALIGN(sizeof(MMHYPERCHUNKFREE), MMHYPER_HEAP_ALIGN_MIN))
402	{
403	/*
404	* Move the FREE chunk up to make room for the new USED chunk.
405	*/
406	const int off = cb + sizeof(MMHYPERCHUNK);
407	PMMHYPERCHUNKFREE pNew = (PMMHYPERCHUNKFREE)((char *)&pFree->core + off);
408	pNew = pFree;
409	pNew->cb -= off;
410	if (pNew->core.offNext)
411	{
412	pNew->core.offNext -= off;
413	PMMHYPERCHUNK pNext = (PMMHYPERCHUNK)((char *)pNew + pNew->core.offNext);
414	MMHYPERCHUNK_SET_OFFPREV(pNext, -(int32_t)pNew->core.offNext);
415	ASSERT_CHUNK(pHeap, pNext);
416	}
417	pNew->core.offPrev = -off;
418	MMHYPERCHUNK_SET_TYPE(pNew, MMHYPERCHUNK_FLAGS_FREE);
419
420	if (pNew->offNext)
421	{
422	pNew->offNext -= off;
423	PMMHYPERCHUNKFREE pNext = (PMMHYPERCHUNKFREE)((char *)pNew + pNew->offNext);
424	pNext->offPrev = -(int32_t)pNew->offNext;
425	ASSERT_CHUNK_FREE(pHeap, pNext);
426	}
427	else
428	pHeap->offFreeTail += off;
429	if (pNew->offPrev)
430	{
431	pNew->offPrev -= off;
432	PMMHYPERCHUNKFREE pPrev = (PMMHYPERCHUNKFREE)((char *)pNew + pNew->offPrev);
433	pPrev->offNext = -pNew->offPrev;
434	ASSERT_CHUNK_FREE(pHeap, pPrev);
435	}
436	else
437	pHeap->offFreeHead += off;
438	pNew->core.offHeap = (uintptr_t)pHeap - (uintptr_t)pNew;
439	pNew->core.offStat = 0;
440	ASSERT_CHUNK_FREE(pHeap, pNew);
441
442	/*
443	* Update the old FREE node making it a USED node.
444	*/
445	pFree->core.offNext = off;
446	MMHYPERCHUNK_SET_TYPE(&pFree->core, MMHYPERCHUNK_FLAGS_USED);
447
448
449	Log3(("mmHyperAllocChunk: cbFree %d -> %d (%d)\n", pHeap->cbFree,
450	pHeap->cbFree - (cb + sizeof(MMHYPERCHUNK)), -(int)(cb + sizeof(MMHYPERCHUNK))));
451	pHeap->cbFree -= (uint32_t)(cb + sizeof(MMHYPERCHUNK));
452	pRet = &pFree->core;
453	ASSERT_CHUNK(pHeap, &pFree->core);
454	Log3(("mmHyperAllocChunk: Created free chunk pNew=%p cb=%d\n", pNew, pNew->cb));
455	}
456	else
457	{
458	/*
459	* Link out of free list.
460	*/
461	if (pFree->offNext)
462	{
463	PMMHYPERCHUNKFREE pNext = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offNext);
464	if (pFree->offPrev)
465	{
466	pNext->offPrev += pFree->offPrev;
467	PMMHYPERCHUNKFREE pPrev = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offPrev);
468	pPrev->offNext += pFree->offNext;
469	ASSERT_CHUNK_FREE(pHeap, pPrev);
470	}
471	else
472	{
473	pHeap->offFreeHead += pFree->offNext;
474	pNext->offPrev = 0;
475	}
476	ASSERT_CHUNK_FREE(pHeap, pNext);
477	}
478	else
479	{
480	if (pFree->offPrev)
481	{
482	pHeap->offFreeTail += pFree->offPrev;
483	PMMHYPERCHUNKFREE pPrev = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offPrev);
484	pPrev->offNext = 0;
485	ASSERT_CHUNK_FREE(pHeap, pPrev);
486	}
487	else
488	{
489	pHeap->offFreeHead = NIL_OFFSET;
490	pHeap->offFreeTail = NIL_OFFSET;
491	}
492	}
493
494	Log3(("mmHyperAllocChunk: cbFree %d -> %d (%d)\n", pHeap->cbFree,
495	pHeap->cbFree - pFree->cb, -(int32_t)pFree->cb));
496	pHeap->cbFree -= pFree->cb;
497	MMHYPERCHUNK_SET_TYPE(&pFree->core, MMHYPERCHUNK_FLAGS_USED);
498	pRet = &pFree->core;
499	ASSERT_CHUNK(pHeap, &pFree->core);
500	Log3(("mmHyperAllocChunk: Converted free chunk %p to used chunk.\n", pFree));
501	}
502	Log3(("mmHyperAllocChunk: Returning %p\n", pRet));
503	break;
504	}
505	}
506
507	/* next */
508	pFree = pFree->offNext ? (PMMHYPERCHUNKFREE)((char *)pFree + pFree->offNext) : NULL;
509	}
510
511	#ifdef MMHYPER_HEAP_STRICT
512	mmr3HyperHeapCheck(pHeap);
513	#endif
514	return pRet;
515	}
516
517
518	/**
519	* Allocates one or more pages of memory from the specified heap.
520	* The caller validates the parameters of this request.
521	*
522	* @returns Pointer to the allocated chunk.
523	* @returns NULL on failure.
524	* @param pHeap The heap.
525	* @param cb Size of the memory block to allocate.
526	* @internal
527	*/
528	static void *mmHyperAllocPages(PMMHYPERHEAP pHeap, uint32_t cb)
529	{
530	Log3(("mmHyperAllocPages: Enter cb=%#x\n", cb));
531
532	#ifdef MMHYPER_HEAP_STRICT
533	mmr3HyperHeapCheck(pHeap);
534	#endif
535
536	/*
537	* Check if there are any free chunks. (NIL_OFFSET use/not-use forces this check)
538	*/
539	if (pHeap->offFreeHead == NIL_OFFSET)
540	return NULL;
541
542	/*
543	* Page aligned chunks.
544	*
545	* Page aligned chunks can only be allocated from the last FREE chunk.
546	* This is for reasons of simplicity and fragmentation. Page aligned memory
547	* must also be allocated in page aligned sizes. Page aligned memory cannot
548	* be freed either.
549	*
550	* So, for this to work, the last FREE chunk needs to end on a page aligned
551	* boundrary.
552	*/
553	PMMHYPERCHUNKFREE pFree = (PMMHYPERCHUNKFREE)((char *)CTXSUFF(pHeap->pbHeap) + pHeap->offFreeTail);
554	ASSERT_CHUNK_FREE(pHeap, pFree);
555	if ( (((uintptr_t)(&pFree->core + 1) + pFree->cb) & PAGE_OFFSET_MASK - 1)
556	\|\| pFree->cb + sizeof(MMHYPERCHUNK) < cb)
557	{
558	Log3(("mmHyperAllocPages: Not enough/no page aligned memory!\n"));
559	return NULL;
560	}
561
562	void *pvRet;
563	if (pFree->cb > cb)
564	{
565	/*
566	* Simple, just cut the top of the free node and return it.
567	*/
568	pFree->cb -= cb;
569	pvRet = (char *)(&pFree->core + 1) + pFree->cb;
570	AssertMsg(RT_ALIGN_P(pvRet, PAGE_SIZE) == pvRet, ("pvRet=%p cb=%#x pFree=%p pFree->cb=%#x\n", pvRet, cb, pFree, pFree->cb));
571	Log3(("mmHyperAllocPages: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree - cb, -(int)cb));
572	pHeap->cbFree -= cb;
573	ASSERT_CHUNK_FREE(pHeap, pFree);
574	Log3(("mmHyperAllocPages: Allocated from pFree=%p new pFree->cb=%d\n", pFree, pFree->cb));
575	}
576	else
577	{
578	/*
579	* Unlink the FREE node.
580	*/
581	pvRet = (char *)(&pFree->core + 1) + pFree->cb - cb;
582	Log3(("mmHyperAllocPages: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree - pFree->cb, -(int32_t)pFree->cb));
583	pHeap->cbFree -= pFree->cb;
584
585	/* a scrap of spare memory (unlikely)? add it to the sprevious chunk. */
586	if (pvRet != (void *)pFree)
587	{
588	AssertMsg(MMHYPERCHUNK_GET_OFFPREV(&pFree->core), ("How the beep did someone manage to allocated up all the heap with page aligned memory?!?\n"));
589	PMMHYPERCHUNK pPrev = (PMMHYPERCHUNK)((char *)pFree + MMHYPERCHUNK_GET_OFFPREV(&pFree->core));
590	pPrev->offNext += (uintptr_t)pvRet - (uintptr_t)pFree;
591	AssertMsg(!MMHYPERCHUNK_ISFREE(pPrev), ("Free bug?\n"));
592	#ifdef VBOX_WITH_STATISTICS
593	PMMHYPERSTAT pStat = (PMMHYPERSTAT)((uintptr_t)pPrev + pPrev->offStat);
594	pStat->cbAllocated += (uintptr_t)pvRet - (uintptr_t)pFree;
595	pStat->cbCurAllocated += (uintptr_t)pvRet - (uintptr_t)pFree;
596	#endif
597	Log3(("mmHyperAllocPages: Added %d to %p (page align)\n", (uintptr_t)pvRet - (uintptr_t)pFree, pFree));
598	}
599
600	/* unlink from FREE chain. */
601	if (pFree->offPrev)
602	{
603	pHeap->offFreeTail += pFree->offPrev;
604	((PMMHYPERCHUNKFREE)((char *)pFree + pFree->offPrev))->offNext = 0;
605	}
606	else
607	{
608	pHeap->offFreeTail = NIL_OFFSET;
609	pHeap->offFreeHead = NIL_OFFSET;
610	}
611	Log3(("mmHyperAllocPages: Unlinked pFree=%d\n", pFree));
612	}
613	pHeap->offPageAligned = (uintptr_t)pvRet - (uintptr_t)CTXSUFF(pHeap->pbHeap);
614	Log3(("mmHyperAllocPages: Returning %p (page aligned)\n", pvRet));
615
616	#ifdef MMHYPER_HEAP_STRICT
617	mmr3HyperHeapCheck(pHeap);
618	#endif
619	return pvRet;
620	}
621
622
623	#ifdef VBOX_WITH_STATISTICS
624	/**
625	* Get the statistic record for a tag.
626	*
627	* @returns Pointer to a stat record.
628	* @returns NULL on failure.
629	* @param pHeap The heap.
630	* @param enmTag The tag.
631	*/
632	static PMMHYPERSTAT mmHyperStat(PMMHYPERHEAP pHeap, MMTAG enmTag)
633	{
634	/* try look it up first. */
635	PMMHYPERSTAT pStat = (PMMHYPERSTAT)RTAvloGCPhysGet(&pHeap->HyperHeapStatTree, enmTag);
636	if (!pStat)
637	{
638	/* try allocate a new one */
639	PMMHYPERCHUNK pChunk = mmHyperAllocChunk(pHeap, RT_ALIGN(sizeof(*pStat), MMHYPER_HEAP_ALIGN_MIN), MMHYPER_HEAP_ALIGN_MIN);
640	if (!pChunk)
641	return NULL;
642	pStat = (PMMHYPERSTAT)(pChunk + 1);
643	pChunk->offStat = (uintptr_t)pStat - (uintptr_t)pChunk;
644
645	ASMMemZero32(pStat, sizeof(*pStat));
646	pStat->Core.Key = enmTag;
647	RTAvloGCPhysInsert(&pHeap->HyperHeapStatTree, &pStat->Core);
648	}
649	if (!pStat->fRegistered)
650	{
651	#ifdef IN_RING3
652	mmR3HyperStatRegisterOne(pHeap->pVMHC, pStat);
653	#else
654	/** @todo schedule a HC action. */
655	#endif
656	}
657	return pStat;
658	}
659
660	#ifdef IN_RING3
661	/**
662	* Registers statistics with STAM.
663	*
664	*/
665	static void mmR3HyperStatRegisterOne(PVM pVM, PMMHYPERSTAT pStat)
666	{
667	if (pStat->fRegistered)
668	return;
669	const char *pszTag = mmR3GetTagName((MMTAG)pStat->Core.Key);
670
671	char szName[128];
672	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cAllocations", pszTag);
673	STAMR3Register(pVM, &pStat->cAllocations, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_COUNT, "Number of alloc calls.");
674
675	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cFrees", pszTag);
676	STAMR3Register(pVM, &pStat->cFrees, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_COUNT, "Number of free calls.");
677
678	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cFailures", pszTag);
679	STAMR3Register(pVM, &pStat->cFailures, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_COUNT, "Number of failures.");
680
681	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cbAllocated", pszTag);
682	STAMR3Register(pVM, &pStat->cbAllocated, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_BYTES, "Total number of allocated bytes.");
683
684	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cbFreed", pszTag);
685	STAMR3Register(pVM, &pStat->cbFreed, STAMTYPE_U64, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_BYTES, "Total number of freed bytes.");
686
687	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cbCurAllocated", pszTag);
688	STAMR3Register(pVM, &pStat->cbCurAllocated, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_BYTES, "Number of bytes currently allocated.");
689
690	RTStrPrintf(szName, sizeof(szName), "/MM/HyperHeap/%s/cbMaxAllocated", pszTag);
691	STAMR3Register(pVM, &pStat->cbMaxAllocated, STAMTYPE_U32, STAMVISIBILITY_ALWAYS, szName, STAMUNIT_BYTES, "Max number of bytes allocated at the same time.");
692
693	pStat->fRegistered = true;
694	}
695	#endif
696
697	#endif
698
699
700	/**
701	* Free memory allocated using MMHyperAlloc().
702	* The caller validates the parameters of this request.
703	*
704	* @returns VBox status code.
705	* @param pVM The VM to operate on.
706	* @param pv The memory to free.
707	* @remark Try avoid free hyper memory.
708	*/
709	MMDECL(int) MMHyperFree(PVM pVM, void *pv)
710	{
711	Log2(("MMHyperFree: pv=%p\n", pv));
712	if (!pv)
713	return VINF_SUCCESS;
714	AssertMsgReturn(RT_ALIGN_P(pv, MMHYPER_HEAP_ALIGN_MIN) == pv,
715	("Invalid pointer %p!\n", pv),
716	VERR_INVALID_POINTER);
717
718	/*
719	* Get the heap and stats.
720	* Validate the chunk at the same time.
721	*/
722	PMMHYPERCHUNK pChunk = (PMMHYPERCHUNK)((PMMHYPERCHUNK)pv - 1);
723
724	AssertMsgReturn( (uintptr_t)pChunk + pChunk->offNext >= (uintptr_t)pChunk
725	\|\| RT_ALIGN_32(pChunk->offNext, MMHYPER_HEAP_ALIGN_MIN) != pChunk->offNext,
726	("%p: offNext=%#RX32\n", pv, pChunk->offNext),
727	VERR_INVALID_POINTER);
728
729	AssertMsgReturn(MMHYPERCHUNK_ISUSED(pChunk),
730	("%p: Not used!\n", pv),
731	VERR_INVALID_POINTER);
732
733	int32_t offPrev = MMHYPERCHUNK_GET_OFFPREV(pChunk);
734	AssertMsgReturn( (uintptr_t)pChunk + offPrev <= (uintptr_t)pChunk
735	&& !((uint32_t)-offPrev & (MMHYPER_HEAP_ALIGN_MIN - 1)),
736	("%p: offPrev=%#RX32!\n", pv, offPrev),
737	VERR_INVALID_POINTER);
738
739	/* statistics */
740	#ifdef VBOX_WITH_STATISTICS
741	PMMHYPERSTAT pStat = (PMMHYPERSTAT)((uintptr_t)pChunk + pChunk->offStat);
742	AssertMsgReturn( RT_ALIGN_P(pStat, MMHYPER_HEAP_ALIGN_MIN) == (void *)pStat
743	&& pChunk->offStat,
744	("%p: offStat=%#RX32!\n", pv, pChunk->offStat),
745	VERR_INVALID_POINTER);
746	#else
747	AssertMsgReturn(!pChunk->offStat,
748	("%p: offStat=%#RX32!\n", pv, pChunk->offStat),
749	VERR_INVALID_POINTER);
750	#endif
751
752	/* The heap structure. */
753	PMMHYPERHEAP pHeap = (PMMHYPERHEAP)((uintptr_t)pChunk + pChunk->offHeap);
754	AssertMsgReturn( !((uintptr_t)pHeap & PAGE_OFFSET_MASK)
755	&& pChunk->offHeap,
756	("%p: pHeap=%#x offHeap=%RX32\n", pv, pHeap->u32Magic, pChunk->offHeap),
757	VERR_INVALID_POINTER);
758
759	AssertMsgReturn(pHeap->u32Magic == MMHYPERHEAP_MAGIC,
760	("%p: u32Magic=%#x\n", pv, pHeap->u32Magic),
761	VERR_INVALID_POINTER);
762	Assert(pHeap == CTXSUFF(pVM->mm.s.pHyperHeap));
763
764	/* Some more verifications using additional info from pHeap. */
765	AssertMsgReturn((uintptr_t)pChunk + offPrev >= (uintptr_t)CTXSUFF(pHeap->pbHeap),
766	("%p: offPrev=%#RX32!\n", pv, offPrev),
767	VERR_INVALID_POINTER);
768
769	AssertMsgReturn(pChunk->offNext < pHeap->cbHeap,
770	("%p: offNext=%#RX32!\n", pv, pChunk->offNext),
771	VERR_INVALID_POINTER);
772
773	AssertMsgReturn( (uintptr_t)pv - (uintptr_t)CTXSUFF(pHeap->pbHeap) <= pHeap->offPageAligned,
774	("Invalid pointer %p! (heap: %p-%p)\n", pv, CTXSUFF(pHeap->pbHeap),
775	(char *)CTXSUFF(pHeap->pbHeap) + pHeap->offPageAligned),
776	VERR_INVALID_POINTER);
777
778	#if defined(VBOX_WITH_STATISTICS) \|\| defined(MMHYPER_HEAP_FREE_POISON)
779	/* calc block size. */
780	const uint32_t cbChunk = pChunk->offNext
781	? pChunk->offNext
782	: CTXSUFF(pHeap->pbHeap) + pHeap->offPageAligned - (uint8_t *)pChunk;
783	#endif
784	#ifdef MMHYPER_HEAP_FREE_POISON
785	/* poison the block */
786	memset(pChunk + 1, MMHYPER_HEAP_FREE_POISON, cbChunk - sizeof(*pChunk));
787	#endif
788
789	#ifdef MMHYPER_HEAP_FREE_DELAY
790	# ifdef MMHYPER_HEAP_FREE_POISON
791	/*
792	* Check poison.
793	*/
794	unsigned i = ELEMENTS(pHeap->aDelayedFrees);
795	while (i-- > 0)
796	if (pHeap->aDelayedFrees[i].offChunk)
797	{
798	PMMHYPERCHUNK pCur = (PMMHYPERCHUNK)((uintptr_t)pHeap + pHeap->aDelayedFrees[i].offChunk);
799	const size_t cb = pCur->offNext
800	? pCur->offNext - sizeof(*pCur)
801	: CTXSUFF(pHeap->pbHeap) + pHeap->offPageAligned - (uint8_t )pCur - sizeof(pCur);
802	uint8_t pab = (uint8_t )(pCur + 1);
803	for (unsigned off = 0; off < cb; off++)
804	AssertReleaseMsg(pab[off] == 0xCB,
805	("caller=%RTptr cb=%#zx off=%#x: %.*Rhxs\n",
806	pHeap->aDelayedFrees[i].uCaller, cb, off, RT_MIN(cb - off, 32), &pab[off]));
807	}
808	# endif /* MMHYPER_HEAP_FREE_POISON */
809
810	/*
811	* Delayed freeing.
812	*/
813	int rc = VINF_SUCCESS;
814	if (pHeap->aDelayedFrees[pHeap->iDelayedFree].offChunk)
815	{
816	PMMHYPERCHUNK pChunkFree = (PMMHYPERCHUNK)((uintptr_t)pHeap + pHeap->aDelayedFrees[pHeap->iDelayedFree].offChunk);
817	rc = mmHyperFree(pHeap, pChunkFree);
818	}
819	pHeap->aDelayedFrees[pHeap->iDelayedFree].offChunk = (uintptr_t)pChunk - (uintptr_t)pHeap;
820	pHeap->aDelayedFrees[pHeap->iDelayedFree].uCaller = (uintptr_t)ASMReturnAddress();
821	pHeap->iDelayedFree = (pHeap->iDelayedFree + 1) % ELEMENTS(pHeap->aDelayedFrees);
822
823	#else /* !MMHYPER_HEAP_FREE_POISON */
824	/*
825	* Call the worker.
826	*/
827	int rc = mmHyperFree(pHeap, pChunk);
828	#endif /* !MMHYPER_HEAP_FREE_POISON */
829
830	/*
831	* Update statistics.
832	*/
833	#ifdef VBOX_WITH_STATISTICS
834	pStat->cFrees++;
835	if (VBOX_SUCCESS(rc))
836	{
837	pStat->cbFreed += cbChunk;
838	pStat->cbCurAllocated -= cbChunk;
839	}
840	else
841	pStat->cFailures++;
842	#endif
843
844	return rc;
845	}
846
847
848	/**
849	* Free memory a memory chunk.
850	*
851	* @returns VBox status code.
852	* @param pHeap The heap.
853	* @param pChunk The memory chunk to free.
854	*/
855	static int mmHyperFree(PMMHYPERHEAP pHeap, PMMHYPERCHUNK pChunk)
856	{
857	Log3(("mmHyperFree: Enter pHeap=%p pChunk=%p\n", pHeap, pChunk));
858	PMMHYPERCHUNKFREE pFree = (PMMHYPERCHUNKFREE)pChunk;
859
860	#ifdef MMHYPER_HEAP_STRICT
861	mmr3HyperHeapCheck(pHeap);
862	#endif
863
864	/*
865	* Insert into the free list (which is sorted on address).
866	*
867	* We'll search towards the end of the heap to locate the
868	* closest FREE chunk.
869	*/
870	PMMHYPERCHUNKFREE pLeft = NULL;
871	PMMHYPERCHUNKFREE pRight = NULL;
872	if (pHeap->offFreeTail != NIL_OFFSET)
873	{
874	if (pFree->core.offNext)
875	{
876	pRight = (PMMHYPERCHUNKFREE)((char *)pFree + pFree->core.offNext);
877	ASSERT_CHUNK(pHeap, &pRight->core);
878	while (!MMHYPERCHUNK_ISFREE(&pRight->core))
879	{
880	if (!pRight->core.offNext)
881	{
882	pRight = NULL;
883	break;
884	}
885	pRight = (PMMHYPERCHUNKFREE)((char *)pRight + pRight->core.offNext);
886	ASSERT_CHUNK(pHeap, &pRight->core);
887	}
888	}
889	if (!pRight)
890	pRight = (PMMHYPERCHUNKFREE)((char )CTXSUFF(pHeap->pbHeap) + pHeap->offFreeTail); /* @todo this can't be correct! 'pLeft = .. ; else' I think */
891	if (pRight)
892	{
893	ASSERT_CHUNK_FREE(pHeap, pRight);
894	if (pRight->offPrev)
895	{
896	pLeft = (PMMHYPERCHUNKFREE)((char *)pRight + pRight->offPrev);
897	ASSERT_CHUNK_FREE(pHeap, pLeft);
898	}
899	}
900	}
901	if (pLeft == pFree)
902	{
903	AssertMsgFailed(("Freed twice! pv=%p (pChunk=%p)\n", pChunk + 1, pChunk));
904	return VERR_INVALID_POINTER;
905	}
906	pChunk->offStat = 0;
907
908	/*
909	* Head free chunk list?
910	*/
911	if (!pLeft)
912	{
913	MMHYPERCHUNK_SET_TYPE(&pFree->core, MMHYPERCHUNK_FLAGS_FREE);
914	pFree->offPrev = 0;
915	pHeap->offFreeHead = (uintptr_t)pFree - (uintptr_t)CTXSUFF(pHeap->pbHeap);
916	if (pRight)
917	{
918	pFree->offNext = (uintptr_t)pRight - (uintptr_t)pFree;
919	pRight->offPrev = -(int32_t)pFree->offNext;
920	}
921	else
922	{
923	pFree->offNext = 0;
924	pHeap->offFreeTail = pHeap->offFreeHead;
925	}
926	Log3(("mmHyperFree: Inserted %p at head of free chain.\n", pFree));
927	}
928	else
929	{
930	/*
931	* Can we merge with left hand free chunk?
932	*/
933	if ((char )pLeft + pLeft->core.offNext == (char )pFree)
934	{
935	if (pFree->core.offNext)
936	{
937	pLeft->core.offNext = pLeft->core.offNext + pFree->core.offNext;
938	MMHYPERCHUNK_SET_OFFPREV(((PMMHYPERCHUNK)((char *)pLeft + pLeft->core.offNext)), -(int32_t)pLeft->core.offNext);
939	}
940	else
941	pLeft->core.offNext = 0;
942	pFree = pLeft;
943	Log3(("mmHyperFree: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree - pLeft->cb, -(int32_t)pLeft->cb));
944	pHeap->cbFree -= pLeft->cb;
945	Log3(("mmHyperFree: Merging %p into %p (cb=%d).\n", pFree, pLeft, pLeft->cb));
946	}
947	/*
948	* No, just link it into the free list then.
949	*/
950	else
951	{
952	MMHYPERCHUNK_SET_TYPE(&pFree->core, MMHYPERCHUNK_FLAGS_FREE);
953	pFree->offPrev = (uintptr_t)pLeft - (uintptr_t)pFree;
954	pLeft->offNext = -pFree->offPrev;
955	if (pRight)
956	{
957	pFree->offNext = (uintptr_t)pRight - (uintptr_t)pFree;
958	pRight->offPrev = -(int32_t)pFree->offNext;
959	}
960	else
961	{
962	pFree->offNext = 0;
963	pHeap->offFreeTail = (uintptr_t)pFree - (uintptr_t)CTXSUFF(pHeap->pbHeap);
964	}
965	Log3(("mmHyperFree: Inserted %p after %p in free list.\n", pFree, pLeft));
966	}
967	}
968
969	/*
970	* Can we merge with right hand free chunk?
971	*/
972	if (pRight && (char )pRight == (char )pFree + pFree->core.offNext)
973	{
974	/* core */
975	if (pRight->core.offNext)
976	{
977	pFree->core.offNext += pRight->core.offNext;
978	PMMHYPERCHUNK pNext = (PMMHYPERCHUNK)((char *)pFree + pFree->core.offNext);
979	MMHYPERCHUNK_SET_OFFPREV(pNext, -(int32_t)pFree->core.offNext);
980	ASSERT_CHUNK(pHeap, pNext);
981	}
982	else
983	pFree->core.offNext = 0;
984
985	/* free */
986	if (pRight->offNext)
987	{
988	pFree->offNext += pRight->offNext;
989	((PMMHYPERCHUNKFREE)((char *)pFree + pFree->offNext))->offPrev = -(int32_t)pFree->offNext;
990	}
991	else
992	{
993	pFree->offNext = 0;
994	pHeap->offFreeTail = (uintptr_t)pFree - (uintptr_t)CTXSUFF(pHeap->pbHeap);
995	}
996	Log3(("mmHyperFree: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree - pRight->cb, -(int32_t)pRight->cb));
997	pHeap->cbFree -= pRight->cb;
998	Log3(("mmHyperFree: Merged %p (cb=%d) into %p.\n", pRight, pRight->cb, pFree));
999	}
1000
1001	/* calculate the size. */
1002	if (pFree->core.offNext)
1003	pFree->cb = pFree->core.offNext - sizeof(MMHYPERCHUNK);
1004	else
1005	pFree->cb = pHeap->offPageAligned - ((uintptr_t)pFree - (uintptr_t)CTXSUFF(pHeap->pbHeap)) - sizeof(MMHYPERCHUNK);
1006	Log3(("mmHyperFree: cbFree %d -> %d (%d)\n", pHeap->cbFree, pHeap->cbFree + pFree->cb, pFree->cb));
1007	pHeap->cbFree += pFree->cb;
1008	ASSERT_CHUNK_FREE(pHeap, pFree);
1009
1010	#ifdef MMHYPER_HEAP_STRICT
1011	mmr3HyperHeapCheck(pHeap);
1012	#endif
1013	return VINF_SUCCESS;
1014	}
1015
1016
1017	#ifdef MMHYPER_HEAP_STRICT
1018	/**
1019	* Internal consitency check.
1020	*/
1021	static void mmr3HyperHeapCheck(PMMHYPERHEAP pHeap)
1022	{
1023	PMMHYPERCHUNKFREE pPrev = NULL;
1024	PMMHYPERCHUNKFREE pCur = (PMMHYPERCHUNKFREE)CTXSUFF(pHeap->pbHeap);
1025	for (;;)
1026	{
1027	if (MMHYPERCHUNK_ISUSED(&pCur->core))
1028	ASSERT_CHUNK_USED(pHeap, &pCur->core);
1029	else
1030	ASSERT_CHUNK_FREE(pHeap, pCur);
1031	if (pPrev)
1032	AssertMsg((int32_t)pPrev->core.offNext == -MMHYPERCHUNK_GET_OFFPREV(&pCur->core),
1033	("pPrev->core.offNext=%d offPrev=%d\n", pPrev->core.offNext, MMHYPERCHUNK_GET_OFFPREV(&pCur->core)));
1034
1035	/* next */
1036	if (!pCur->core.offNext)
1037	break;
1038	pPrev = pCur;
1039	pCur = (PMMHYPERCHUNKFREE)((char *)pCur + pCur->core.offNext);
1040	}
1041	}
1042	#endif
1043
1044
1045	#ifdef DEBUG
1046	/**
1047	* Dumps the hypervisor heap to Log.
1048	* @param pVM VM Handle.
1049	*/
1050	MMDECL(void) MMHyperHeapDump(PVM pVM)
1051	{
1052	Log(("MMHyperHeapDump: * heap dump - start *\n"));
1053	PMMHYPERHEAP pHeap = CTXSUFF(pVM->mm.s.pHyperHeap);
1054	PMMHYPERCHUNKFREE pCur = (PMMHYPERCHUNKFREE)CTXSUFF(pHeap->pbHeap);
1055	for (;;)
1056	{
1057	if (MMHYPERCHUNK_ISUSED(&pCur->core))
1058	{
1059	if (pCur->core.offStat)
1060	{
1061	PMMHYPERSTAT pStat = (PMMHYPERSTAT)((uintptr_t)pCur + pCur->core.offStat);
1062	const char *pszSelf = pCur->core.offStat == sizeof(MMHYPERCHUNK) ? " stat record" : "";
1063	#ifdef IN_RING3
1064	Log(("%p %06x USED offNext=%06x offPrev=-%06x %s%s\n",
1065	pCur, (uintptr_t)pCur - (uintptr_t)CTXSUFF(pHeap->pbHeap),
1066	pCur->core.offNext, -MMHYPERCHUNK_GET_OFFPREV(&pCur->core),
1067	mmR3GetTagName((MMTAG)pStat->Core.Key), pszSelf));
1068	#else
1069	Log(("%p %06x USED offNext=%06x offPrev=-%06x %d%s\n",
1070	pCur, (uintptr_t)pCur - (uintptr_t)CTXSUFF(pHeap->pbHeap),
1071	pCur->core.offNext, -MMHYPERCHUNK_GET_OFFPREV(&pCur->core),
1072	(MMTAG)pStat->Core.Key, pszSelf));
1073	#endif
1074	}
1075	else
1076	Log(("%p %06x USED offNext=%06x offPrev=-%06x\n",
1077	pCur, (uintptr_t)pCur - (uintptr_t)CTXSUFF(pHeap->pbHeap),
1078	pCur->core.offNext, -MMHYPERCHUNK_GET_OFFPREV(&pCur->core)));
1079	}
1080	else
1081	Log(("%p %06x FREE offNext=%06x offPrev=-%06x : cb=%06x offNext=%06x offPrev=-%06x\n",
1082	pCur, (uintptr_t)pCur - (uintptr_t)CTXSUFF(pHeap->pbHeap),
1083	pCur->core.offNext, -MMHYPERCHUNK_GET_OFFPREV(&pCur->core), pCur->cb, pCur->offNext, pCur->offPrev));
1084
1085	/* next */
1086	if (!pCur->core.offNext)
1087	break;
1088	pCur = (PMMHYPERCHUNKFREE)((char *)pCur + pCur->core.offNext);
1089	}
1090	Log(("MMHyperHeapDump: * heap dump - end *\n"));
1091	}
1092	#endif
1093
1094
1095	/**
1096	* Query the amount of free memory in the hypervisor heap.
1097	*
1098	* @returns Number of free bytes in the hypervisor heap.
1099	*/
1100	MMDECL(size_t) MMHyperHeapGetFreeSize(PVM pVM)
1101	{
1102	return CTXSUFF(pVM->mm.s.pHyperHeap)->cbFree;
1103	}
1104
1105	/**
1106	* Query the size the hypervisor heap.
1107	*
1108	* @returns The size of the hypervisor heap in bytes.
1109	*/
1110	MMDECL(size_t) MMHyperHeapGetSize(PVM pVM)
1111	{
1112	return CTXSUFF(pVM->mm.s.pHyperHeap)->cbHeap;
1113	}
1114
1115
1116	/**
1117	* Query the address and size the hypervisor memory area.
1118	*
1119	* @returns Base address of the hypervisor area.
1120	* @param pVM VM Handle.
1121	* @param pcb Where to store the size of the hypervisor area. (out)
1122	*/
1123	MMDECL(RTGCPTR) MMHyperGetArea(PVM pVM, size_t *pcb)
1124	{
1125	if (pcb)
1126	*pcb = pVM->mm.s.cbHyperArea;
1127	return pVM->mm.s.pvHyperAreaGC;
1128	}
1129
1130
1131	/**
1132	* Checks if an address is within the hypervisor memory area.
1133	*
1134	* @returns true if inside.
1135	* @returns false if outside.
1136	* @param pVM VM handle.
1137	* @param GCPtr The pointer to check.
1138	*/
1139	MMDECL(bool) MMHyperIsInsideArea(PVM pVM, RTGCPTR GCPtr)
1140	{
1141	return (RTGCUINTPTR)GCPtr - (RTGCUINTPTR)pVM->mm.s.pvHyperAreaGC < pVM->mm.s.cbHyperArea;
1142	}
1143

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source: vbox/trunk/src/VBox/VMM/VMMAll/MMAllHyper.cpp@ 5629

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