memobj-r0drv-darwin.cpp@ 43355

最後變更在這個檔案從43355是 43355,由 vboxsync 提交於 13 年前
r0drv/darwin: memobj-r0drv-darwin; complete() and prepare() must be paired and called before release().
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1	/* $Id: memobj-r0drv-darwin.cpp 43355 2012-09-18 15:33:18Z vboxsync $ */
2	/** @file
3	* IPRT - Ring-0 Memory Objects, Darwin.
4	*/
5
6	/*
7	* Copyright (C) 2006-2012 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.alldomusa.eu.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
27
28	/*******************************************************************************
29	* Header Files *
30	*******************************************************************************/
31	#include "the-darwin-kernel.h"
32	#include "internal/iprt.h"
33	#include <iprt/memobj.h>
34
35	#include <iprt/asm.h>
36	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
37	# include <iprt/x86.h>
38	# include <iprt/asm-amd64-x86.h>
39	#endif
40	#include <iprt/assert.h>
41	#include <iprt/log.h>
42	#include <iprt/mem.h>
43	#include <iprt/param.h>
44	#include <iprt/process.h>
45	#include <iprt/string.h>
46	#include <iprt/thread.h>
47	#include "internal/memobj.h"
48
49	/#define USE_VM_MAP_WIRE - may re-enable later when non-mapped allocations are added. /
50
51
52	/*******************************************************************************
53	* Structures and Typedefs *
54	*******************************************************************************/
55	/**
56	* The Darwin version of the memory object structure.
57	*/
58	typedef struct RTR0MEMOBJDARWIN
59	{
60	/** The core structure. */
61	RTR0MEMOBJINTERNAL Core;
62	/** Pointer to the memory descriptor created for allocated and locked memory. */
63	IOMemoryDescriptor *pMemDesc;
64	/** Pointer to the memory mapping object for mapped memory. */
65	IOMemoryMap *pMemMap;
66	} RTR0MEMOBJDARWIN, *PRTR0MEMOBJDARWIN;
67
68
69	/**
70	* Touch the pages to force the kernel to create or write-enable the page table
71	* entries.
72	*
73	* This is necessary since the kernel gets upset if we take a page fault when
74	* preemption is disabled and/or we own a simple lock (same thing). It has no
75	* problems with us disabling interrupts when taking the traps, weird stuff.
76	*
77	* (This is basically a way of invoking vm_fault on a range of pages.)
78	*
79	* @param pv Pointer to the first page.
80	* @param cb The number of bytes.
81	*/
82	static void rtR0MemObjDarwinTouchPages(void *pv, size_t cb)
83	{
84	uint32_t volatile pu32 = (uint32_t volatile )pv;
85	for (;;)
86	{
87	ASMAtomicCmpXchgU32(pu32, 0xdeadbeef, 0xdeadbeef);
88	if (cb <= PAGE_SIZE)
89	break;
90	cb -= PAGE_SIZE;
91	pu32 += PAGE_SIZE / sizeof(uint32_t);
92	}
93	}
94
95
96	/**
97	* Read (sniff) every page in the range to make sure there are some page tables
98	* entries backing it.
99	*
100	* This is just to be sure vm_protect didn't remove stuff without re-adding it
101	* if someone should try write-protect something.
102	*
103	* @param pv Pointer to the first page.
104	* @param cb The number of bytes.
105	*/
106	static void rtR0MemObjDarwinSniffPages(void const *pv, size_t cb)
107	{
108	uint32_t volatile pu32 = (uint32_t volatile )pv;
109	uint32_t volatile u32Counter = 0;
110	for (;;)
111	{
112	u32Counter += *pu32;
113
114	if (cb <= PAGE_SIZE)
115	break;
116	cb -= PAGE_SIZE;
117	pu32 += PAGE_SIZE / sizeof(uint32_t);
118	}
119	}
120
121
122	/**
123	* Gets the virtual memory map the specified object is mapped into.
124	*
125	* @returns VM map handle on success, NULL if no map.
126	* @param pMem The memory object.
127	*/
128	DECLINLINE(vm_map_t) rtR0MemObjDarwinGetMap(PRTR0MEMOBJINTERNAL pMem)
129	{
130	switch (pMem->enmType)
131	{
132	case RTR0MEMOBJTYPE_PAGE:
133	case RTR0MEMOBJTYPE_LOW:
134	case RTR0MEMOBJTYPE_CONT:
135	return kernel_map;
136
137	case RTR0MEMOBJTYPE_PHYS:
138	case RTR0MEMOBJTYPE_PHYS_NC:
139	return NULL; /* pretend these have no mapping atm. */
140
141	case RTR0MEMOBJTYPE_LOCK:
142	return pMem->u.Lock.R0Process == NIL_RTR0PROCESS
143	? kernel_map
144	: get_task_map((task_t)pMem->u.Lock.R0Process);
145
146	case RTR0MEMOBJTYPE_RES_VIRT:
147	return pMem->u.ResVirt.R0Process == NIL_RTR0PROCESS
148	? kernel_map
149	: get_task_map((task_t)pMem->u.ResVirt.R0Process);
150
151	case RTR0MEMOBJTYPE_MAPPING:
152	return pMem->u.Mapping.R0Process == NIL_RTR0PROCESS
153	? kernel_map
154	: get_task_map((task_t)pMem->u.Mapping.R0Process);
155
156	default:
157	return NULL;
158	}
159	}
160
161	#if 0 /* not necessary after all*/
162	/* My vm_map mockup. */
163	struct my_vm_map
164	{
165	struct { char pad[8]; } lock;
166	struct my_vm_map_header
167	{
168	struct vm_map_links
169	{
170	void *prev;
171	void *next;
172	vm_map_offset_t start;
173	vm_map_offset_t end;
174	} links;
175	int nentries;
176	boolean_t entries_pageable;
177	} hdr;
178	pmap_t pmap;
179	vm_map_size_t size;
180	};
181
182
183	/**
184	* Gets the minimum map address, this is similar to get_map_min.
185	*
186	* @returns The start address of the map.
187	* @param pMap The map.
188	*/
189	static vm_map_offset_t rtR0MemObjDarwinGetMapMin(vm_map_t pMap)
190	{
191	/* lazy discovery of the correct offset. The apple guys is a wonderfully secretive bunch. */
192	static int32_t volatile s_offAdjust = INT32_MAX;
193	int32_t off = s_offAdjust;
194	if (off == INT32_MAX)
195	{
196	for (off = 0; ; off += sizeof(pmap_t))
197	{
198	if ((pmap_t )((uint8_t *)kernel_map + off) == kernel_pmap)
199	break;
200	AssertReturn(off <= RT_MAX(RT_OFFSETOF(struct my_vm_map, pmap) * 4, 1024), 0x1000);
201	}
202	ASMAtomicWriteS32(&s_offAdjust, off - RT_OFFSETOF(struct my_vm_map, pmap));
203	}
204
205	/* calculate it. */
206	struct my_vm_map pMyMap = (struct my_vm_map )((uint8_t *)pMap + off);
207	return pMyMap->hdr.links.start;
208	}
209	#endif /* unused */
210
211	#ifdef RT_STRICT
212
213	/**
214	* Read from a physical page.
215	*
216	* @param HCPhys The address to start reading at.
217	* @param cb How many bytes to read.
218	* @param pvDst Where to put the bytes. This is zero'd on failure.
219	*/
220	static void rtR0MemObjDarwinReadPhys(RTHCPHYS HCPhys, size_t cb, void *pvDst)
221	{
222	memset(pvDst, '\0', cb);
223
224	IOAddressRange aRanges[1] = { { (mach_vm_address_t)HCPhys, RT_ALIGN_Z(cb, PAGE_SIZE) } };
225	IOMemoryDescriptor *pMemDesc = IOMemoryDescriptor::withAddressRanges(&aRanges[0], RT_ELEMENTS(aRanges),
226	kIODirectionIn, NULL /task/);
227	if (pMemDesc)
228	{
229	#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
230	IOMemoryMap *pMemMap = pMemDesc->createMappingInTask(kernel_task, 0, kIOMapAnywhere \| kIOMapDefaultCache);
231	#else
232	IOMemoryMap *pMemMap = pMemDesc->map(kernel_task, 0, kIOMapAnywhere \| kIOMapDefaultCache);
233	#endif
234	if (pMemMap)
235	{
236	void const pvSrc = (void const )(uintptr_t)pMemMap->getVirtualAddress();
237	memcpy(pvDst, pvSrc, cb);
238	pMemMap->release();
239	}
240	else
241	printf("rtR0MemObjDarwinReadPhys: createMappingInTask failed; HCPhys=%llx\n", HCPhys);
242
243	pMemDesc->release();
244	}
245	else
246	printf("rtR0MemObjDarwinReadPhys: withAddressRanges failed; HCPhys=%llx\n", HCPhys);
247	}
248
249
250	/**
251	* Gets the PTE for a page.
252	*
253	* @returns the PTE.
254	* @param pvPage The virtual address to get the PTE for.
255	*/
256	static uint64_t rtR0MemObjDarwinGetPTE(void *pvPage)
257	{
258	RTUINT64U u64;
259	RTCCUINTREG cr3 = ASMGetCR3();
260	RTCCUINTREG cr4 = ASMGetCR4();
261	bool fPAE = false;
262	bool fLMA = false;
263	if (cr4 & X86_CR4_PAE)
264	{
265	fPAE = true;
266	uint32_t fExtFeatures = ASMCpuId_EDX(0x80000001);
267	if (fExtFeatures & X86_CPUID_EXT_FEATURE_EDX_LONG_MODE)
268	{
269	uint64_t efer = ASMRdMsr(MSR_K6_EFER);
270	if (efer & MSR_K6_EFER_LMA)
271	fLMA = true;
272	}
273	}
274
275	if (fLMA)
276	{
277	/* PML4 */
278	rtR0MemObjDarwinReadPhys((cr3 & ~(RTCCUINTREG)PAGE_OFFSET_MASK) \| (((uint64_t)(uintptr_t)pvPage >> X86_PML4_SHIFT) & X86_PML4_MASK) * 8, 8, &u64);
279	if (!(u64.u & X86_PML4E_P))
280	{
281	printf("rtR0MemObjDarwinGetPTE: %p -> PML4E !p\n", pvPage);
282	return 0;
283	}
284
285	/* PDPTR */
286	rtR0MemObjDarwinReadPhys((u64.u & ~(uint64_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_AMD64) * 8, 8, &u64);
287	if (!(u64.u & X86_PDPE_P))
288	{
289	printf("rtR0MemObjDarwinGetPTE: %p -> PDPTE !p\n", pvPage);
290	return 0;
291	}
292	if (u64.u & X86_PDPE_LM_PS)
293	return (u64.u & ~(uint64_t)(_1G -1)) \| ((uintptr_t)pvPage & (_1G -1));
294
295	/* PD */
296	rtR0MemObjDarwinReadPhys((u64.u & ~(uint64_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK) * 8, 8, &u64);
297	if (!(u64.u & X86_PDE_P))
298	{
299	printf("rtR0MemObjDarwinGetPTE: %p -> PDE !p\n", pvPage);
300	return 0;
301	}
302	if (u64.u & X86_PDE_PS)
303	return (u64.u & ~(uint64_t)(_2M -1)) \| ((uintptr_t)pvPage & (_2M -1));
304
305	/* PT */
306	rtR0MemObjDarwinReadPhys((u64.u & ~(uint64_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK) * 8, 8, &u64);
307	if (!(u64.u & X86_PTE_P))
308	{
309	printf("rtR0MemObjDarwinGetPTE: %p -> PTE !p\n", pvPage);
310	return 0;
311	}
312	return u64.u;
313	}
314
315	if (fPAE)
316	{
317	/* PDPTR */
318	rtR0MemObjDarwinReadPhys((u64.u & X86_CR3_PAE_PAGE_MASK) \| (((uintptr_t)pvPage >> X86_PDPT_SHIFT) & X86_PDPT_MASK_PAE) * 8, 8, &u64);
319	if (!(u64.u & X86_PDE_P))
320	return 0;
321
322	/* PD */
323	rtR0MemObjDarwinReadPhys((u64.u & ~(uint64_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PD_PAE_SHIFT) & X86_PD_PAE_MASK) * 8, 8, &u64);
324	if (!(u64.u & X86_PDE_P))
325	return 0;
326	if (u64.u & X86_PDE_PS)
327	return (u64.u & ~(uint64_t)(_2M -1)) \| ((uintptr_t)pvPage & (_2M -1));
328
329	/* PT */
330	rtR0MemObjDarwinReadPhys((u64.u & ~(uint64_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PT_PAE_SHIFT) & X86_PT_PAE_MASK) * 8, 8, &u64);
331	if (!(u64.u & X86_PTE_P))
332	return 0;
333	return u64.u;
334	}
335
336	/* PD */
337	rtR0MemObjDarwinReadPhys((u64.au32[0] & ~(uint32_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PD_SHIFT) & X86_PD_MASK) * 4, 4, &u64);
338	if (!(u64.au32[0] & X86_PDE_P))
339	return 0;
340	if (u64.au32[0] & X86_PDE_PS)
341	return (u64.u & ~(uint64_t)(_2M -1)) \| ((uintptr_t)pvPage & (_2M -1));
342
343	/* PT */
344	rtR0MemObjDarwinReadPhys((u64.au32[0] & ~(uint32_t)PAGE_OFFSET_MASK) \| (((uintptr_t)pvPage >> X86_PT_SHIFT) & X86_PT_MASK) * 4, 4, &u64);
345	if (!(u64.au32[0] & X86_PTE_P))
346	return 0;
347	return u64.au32[0];
348
349	return 0;
350	}
351
352	#endif /* RT_STRICT */
353
354	DECLHIDDEN(int) rtR0MemObjNativeFree(RTR0MEMOBJ pMem)
355	{
356	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)pMem;
357
358	/*
359	* Release the IOMemoryDescriptor or/and IOMemoryMap associated with the object.
360	*/
361	if (pMemDarwin->pMemDesc)
362	{
363	pMemDarwin->pMemDesc->complete();
364	pMemDarwin->pMemDesc->release();
365	pMemDarwin->pMemDesc = NULL;
366	}
367
368	if (pMemDarwin->pMemMap)
369	{
370	pMemDarwin->pMemMap->release();
371	pMemDarwin->pMemMap = NULL;
372	}
373
374	/*
375	* Release any memory that we've allocated or locked.
376	*/
377	switch (pMemDarwin->Core.enmType)
378	{
379	case RTR0MEMOBJTYPE_LOW:
380	case RTR0MEMOBJTYPE_PAGE:
381	case RTR0MEMOBJTYPE_CONT:
382	break;
383
384	case RTR0MEMOBJTYPE_LOCK:
385	{
386	#ifdef USE_VM_MAP_WIRE
387	vm_map_t Map = pMemDarwin->Core.u.Lock.R0Process != NIL_RTR0PROCESS
388	? get_task_map((task_t)pMemDarwin->Core.u.Lock.R0Process)
389	: kernel_map;
390	kern_return_t kr = vm_map_unwire(Map,
391	(vm_map_offset_t)pMemDarwin->Core.pv,
392	(vm_map_offset_t)pMemDarwin->Core.pv + pMemDarwin->Core.cb,
393	0 /* not user */);
394	AssertRC(kr == KERN_SUCCESS); /** @todo don't ignore... */
395	#endif
396	break;
397	}
398
399	case RTR0MEMOBJTYPE_PHYS:
400	/*if (pMemDarwin->Core.u.Phys.fAllocated)
401	IOFreePhysical(pMemDarwin->Core.u.Phys.PhysBase, pMemDarwin->Core.cb);*/
402	Assert(!pMemDarwin->Core.u.Phys.fAllocated);
403	break;
404
405	case RTR0MEMOBJTYPE_PHYS_NC:
406	AssertMsgFailed(("RTR0MEMOBJTYPE_PHYS_NC\n"));
407	return VERR_INTERNAL_ERROR;
408
409	case RTR0MEMOBJTYPE_RES_VIRT:
410	AssertMsgFailed(("RTR0MEMOBJTYPE_RES_VIRT\n"));
411	return VERR_INTERNAL_ERROR;
412
413	case RTR0MEMOBJTYPE_MAPPING:
414	/* nothing to do here. */
415	break;
416
417	default:
418	AssertMsgFailed(("enmType=%d\n", pMemDarwin->Core.enmType));
419	return VERR_INTERNAL_ERROR;
420	}
421
422	return VINF_SUCCESS;
423	}
424
425
426
427	/**
428	* Kernel memory alloc worker that uses inTaskWithPhysicalMask.
429	*
430	* @returns IPRT status code.
431	* @retval VERR_ADDRESS_TOO_BIG try another way.
432	*
433	* @param ppMem Where to return the memory object.
434	* @param cb The page aligned memory size.
435	* @param fExecutable Whether the mapping needs to be executable.
436	* @param fContiguous Whether the backing memory needs to be contiguous.
437	* @param PhysMask The mask for the backing memory (i.e. range). Use 0 if
438	* you don't care that much or is speculating.
439	* @param MaxPhysAddr The max address to verify the result against. Use
440	* UINT64_MAX if it doesn't matter.
441	* @param enmType The object type.
442	*/
443	static int rtR0MemObjNativeAllocWorker(PPRTR0MEMOBJINTERNAL ppMem, size_t cb,
444	bool fExecutable, bool fContiguous,
445	mach_vm_address_t PhysMask, uint64_t MaxPhysAddr,
446	RTR0MEMOBJTYPE enmType)
447	{
448	/*
449	* Try inTaskWithPhysicalMask first, but since we don't quite trust that it
450	* actually respects the physical memory mask (10.5.x is certainly busted),
451	* we'll use rtR0MemObjNativeAllocCont as a fallback for dealing with that.
452	*
453	* The kIOMemoryKernelUserShared flag just forces the result to be page aligned.
454	*/
455	#if 1 /** @todo Figure out why this is broken. Is it only on snow leopard? Seen allocating memory for the VM structure, last page corrupted or inaccessible. */
456	size_t const cbFudged = cb + PAGE_SIZE;
457	#else
458	size_t const cbFudged = cb;
459	#endif
460	int rc;
461	IOBufferMemoryDescriptor *pMemDesc =
462	IOBufferMemoryDescriptor::inTaskWithPhysicalMask(kernel_task,
463	kIOMemoryKernelUserShared
464	\| kIODirectionInOut
465	\| (fContiguous ? kIOMemoryPhysicallyContiguous : 0),
466	cbFudged,
467	PhysMask);
468	if (pMemDesc)
469	{
470	IOReturn IORet = pMemDesc->prepare(kIODirectionInOut);
471	if (IORet == kIOReturnSuccess)
472	{
473	void *pv = pMemDesc->getBytesNoCopy(0, cbFudged);
474	if (pv)
475	{
476	/*
477	* Check if it's all below 4GB.
478	*/
479	addr64_t AddrPrev = 0;
480	MaxPhysAddr &= ~(uint64_t)PAGE_OFFSET_MASK;
481	for (IOByteCount off = 0; off < cb; off += PAGE_SIZE)
482	{
483	#ifdef __LP64__ /* Grumble! */
484	addr64_t Addr = pMemDesc->getPhysicalSegment(off, NULL);
485	#else
486	addr64_t Addr = pMemDesc->getPhysicalSegment64(off, NULL);
487	#endif
488	if ( Addr > MaxPhysAddr
489	\|\| !Addr
490	\|\| (Addr & PAGE_OFFSET_MASK)
491	\|\| ( fContiguous
492	&& !off
493	&& Addr == AddrPrev + PAGE_SIZE))
494	{
495	/* Buggy API, try allocate the memory another way. */
496	pMemDesc->complete();
497	pMemDesc->release();
498	if (PhysMask)
499	LogAlways(("rtR0MemObjNativeAllocWorker: off=%x Addr=%llx AddrPrev=%llx MaxPhysAddr=%llx PhysMas=%llx - buggy API!\n",
500	off, Addr, AddrPrev, MaxPhysAddr, PhysMask));
501	return VERR_ADDRESS_TOO_BIG;
502	}
503	AddrPrev = Addr;
504	}
505
506	#ifdef RT_STRICT
507	/* check that the memory is actually mapped. */
508	//addr64_t Addr = pMemDesc->getPhysicalSegment64(0, NULL);
509	//printf("rtR0MemObjNativeAllocWorker: pv=%p %8llx %8llx\n", pv, rtR0MemObjDarwinGetPTE(pv), Addr);
510	RTTHREADPREEMPTSTATE State = RTTHREADPREEMPTSTATE_INITIALIZER;
511	RTThreadPreemptDisable(&State);
512	rtR0MemObjDarwinTouchPages(pv, cb);
513	RTThreadPreemptRestore(&State);
514	#endif
515
516	/*
517	* Create the IPRT memory object.
518	*/
519	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), enmType, pv, cb);
520	if (pMemDarwin)
521	{
522	if (fContiguous)
523	{
524	#ifdef __LP64__ /* Grumble! */
525	addr64_t PhysBase64 = pMemDesc->getPhysicalSegment(0, NULL);
526	#else
527	addr64_t PhysBase64 = pMemDesc->getPhysicalSegment64(0, NULL);
528	#endif
529	RTHCPHYS PhysBase = PhysBase64; Assert(PhysBase == PhysBase64);
530	if (enmType == RTR0MEMOBJTYPE_CONT)
531	pMemDarwin->Core.u.Cont.Phys = PhysBase;
532	else if (enmType == RTR0MEMOBJTYPE_PHYS)
533	pMemDarwin->Core.u.Phys.PhysBase = PhysBase;
534	else
535	AssertMsgFailed(("enmType=%d\n", enmType));
536	}
537
538	#if 1 /* Experimental code. */
539	if (fExecutable)
540	{
541	rc = rtR0MemObjNativeProtect(&pMemDarwin->Core, 0, cb, RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC);
542	# ifdef RT_STRICT
543	/* check that the memory is actually mapped. */
544	RTTHREADPREEMPTSTATE State = RTTHREADPREEMPTSTATE_INITIALIZER;
545	RTThreadPreemptDisable(&State);
546	rtR0MemObjDarwinTouchPages(pv, cb);
547	RTThreadPreemptRestore(&State);
548	# endif
549
550	/* Bug 6226: Ignore KERN_PROTECTION_FAILURE on Leopard and older. */
551	if ( rc == VERR_PERMISSION_DENIED
552	&& version_major <= 10 /* 10 = 10.6.x = Snow Leopard. */)
553	rc = VINF_SUCCESS;
554	}
555	else
556	#endif
557	rc = VINF_SUCCESS;
558	if (RT_SUCCESS(rc))
559	{
560	pMemDarwin->pMemDesc = pMemDesc;
561	*ppMem = &pMemDarwin->Core;
562	return VINF_SUCCESS;
563	}
564
565	rtR0MemObjDelete(&pMemDarwin->Core);
566	}
567
568	if (enmType == RTR0MEMOBJTYPE_PHYS_NC)
569	rc = VERR_NO_PHYS_MEMORY;
570	else if (enmType == RTR0MEMOBJTYPE_LOW)
571	rc = VERR_NO_LOW_MEMORY;
572	else if (enmType == RTR0MEMOBJTYPE_CONT)
573	rc = VERR_NO_CONT_MEMORY;
574	else
575	rc = VERR_NO_MEMORY;
576	}
577	else
578	rc = VERR_MEMOBJ_INIT_FAILED;
579
580	pMemDesc->complete();
581	}
582	else
583	rc = RTErrConvertFromDarwinIO(IORet);
584	pMemDesc->release();
585	}
586	else
587	rc = VERR_MEMOBJ_INIT_FAILED;
588	Assert(rc != VERR_ADDRESS_TOO_BIG);
589	return rc;
590	}
591
592
593	DECLHIDDEN(int) rtR0MemObjNativeAllocPage(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
594	{
595	return rtR0MemObjNativeAllocWorker(ppMem, cb, fExecutable, false /* fContiguous */,
596	0 /* PhysMask */, UINT64_MAX, RTR0MEMOBJTYPE_PAGE);
597	}
598
599
600	DECLHIDDEN(int) rtR0MemObjNativeAllocLow(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
601	{
602	/*
603	* Try IOMallocPhysical/IOMallocAligned first.
604	* Then try optimistically without a physical address mask, which will always
605	* end up using IOMallocAligned.
606	*
607	* (See bug comment in the worker and IOBufferMemoryDescriptor::initWithPhysicalMask.)
608	*/
609	int rc = rtR0MemObjNativeAllocWorker(ppMem, cb, fExecutable, false /* fContiguous */,
610	~(uint32_t)PAGE_OFFSET_MASK, _4G - PAGE_SIZE, RTR0MEMOBJTYPE_LOW);
611	if (rc == VERR_ADDRESS_TOO_BIG)
612	rc = rtR0MemObjNativeAllocWorker(ppMem, cb, fExecutable, false /* fContiguous */,
613	0 /* PhysMask */, _4G - PAGE_SIZE, RTR0MEMOBJTYPE_LOW);
614	return rc;
615	}
616
617
618	DECLHIDDEN(int) rtR0MemObjNativeAllocCont(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable)
619	{
620	int rc = rtR0MemObjNativeAllocWorker(ppMem, cb, fExecutable, true /* fContiguous */,
621	~(uint32_t)PAGE_OFFSET_MASK, _4G - PAGE_SIZE,
622	RTR0MEMOBJTYPE_CONT);
623
624	/*
625	* Workaround for bogus IOKernelAllocateContiguous behavior, just in case.
626	* cb <= PAGE_SIZE allocations take a different path, using a different allocator.
627	*/
628	if (RT_FAILURE(rc) && cb <= PAGE_SIZE)
629	rc = rtR0MemObjNativeAllocWorker(ppMem, cb + PAGE_SIZE, fExecutable, true /* fContiguous */,
630	~(uint32_t)PAGE_OFFSET_MASK, _4G - PAGE_SIZE,
631	RTR0MEMOBJTYPE_CONT);
632	return rc;
633	}
634
635
636	DECLHIDDEN(int) rtR0MemObjNativeAllocPhys(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment)
637	{
638	/** @todo alignment */
639	if (uAlignment != PAGE_SIZE)
640	return VERR_NOT_SUPPORTED;
641
642	/*
643	* Translate the PhysHighest address into a mask.
644	*/
645	int rc;
646	if (PhysHighest == NIL_RTHCPHYS)
647	rc = rtR0MemObjNativeAllocWorker(ppMem, cb, true /* fExecutable /, true / fContiguous */,
648	0 /* PhysMask*/, UINT64_MAX, RTR0MEMOBJTYPE_PHYS);
649	else
650	{
651	mach_vm_address_t PhysMask = 0;
652	PhysMask = ~(mach_vm_address_t)0;
653	while (PhysMask > (PhysHighest \| PAGE_OFFSET_MASK))
654	PhysMask >>= 1;
655	AssertReturn(PhysMask + 1 <= cb, VERR_INVALID_PARAMETER);
656	PhysMask &= ~(mach_vm_address_t)PAGE_OFFSET_MASK;
657
658	rc = rtR0MemObjNativeAllocWorker(ppMem, cb, true /* fExecutable /, true / fContiguous */,
659	PhysMask, PhysHighest, RTR0MEMOBJTYPE_PHYS);
660	}
661	return rc;
662	}
663
664
665	DECLHIDDEN(int) rtR0MemObjNativeAllocPhysNC(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest)
666	{
667	/** @todo rtR0MemObjNativeAllocPhys / darwin.
668	* This might be a bit problematic and may very well require having to create our own
669	* object which we populate with pages but without mapping it into any address space.
670	* Estimate is 2-3 days.
671	*/
672	return VERR_NOT_SUPPORTED;
673	}
674
675
676	DECLHIDDEN(int) rtR0MemObjNativeEnterPhys(PPRTR0MEMOBJINTERNAL ppMem, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy)
677	{
678	AssertReturn(uCachePolicy == RTMEM_CACHE_POLICY_DONT_CARE, VERR_NOT_SUPPORTED);
679
680	/*
681	* Create a descriptor for it (the validation is always true on intel macs, but
682	* as it doesn't harm us keep it in).
683	*/
684	int rc = VERR_ADDRESS_TOO_BIG;
685	IOAddressRange aRanges[1] = { { Phys, cb } };
686	if ( aRanges[0].address == Phys
687	&& aRanges[0].length == cb)
688	{
689	IOMemoryDescriptor *pMemDesc = IOMemoryDescriptor::withAddressRanges(&aRanges[0], RT_ELEMENTS(aRanges),
690	kIODirectionInOut, NULL /task/);
691	if (pMemDesc)
692	{
693	#ifdef __LP64__ /* Grumble! */
694	Assert(Phys == pMemDesc->getPhysicalSegment(0, 0));
695	#else
696	Assert(Phys == pMemDesc->getPhysicalSegment64(0, 0));
697	#endif
698
699	/*
700	* Create the IPRT memory object.
701	*/
702	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), RTR0MEMOBJTYPE_PHYS, NULL, cb);
703	if (pMemDarwin)
704	{
705	pMemDarwin->Core.u.Phys.PhysBase = Phys;
706	pMemDarwin->Core.u.Phys.fAllocated = false;
707	pMemDarwin->Core.u.Phys.uCachePolicy = uCachePolicy;
708	pMemDarwin->pMemDesc = pMemDesc;
709	*ppMem = &pMemDarwin->Core;
710	return VINF_SUCCESS;
711	}
712
713	rc = VERR_NO_MEMORY;
714	pMemDesc->release();
715	}
716	else
717	rc = VERR_MEMOBJ_INIT_FAILED;
718	}
719	else
720	AssertMsgFailed(("%#llx %llx\n", (unsigned long long)Phys, (unsigned long long)cb));
721	return rc;
722	}
723
724
725	/**
726	* Internal worker for locking down pages.
727	*
728	* @return IPRT status code.
729	*
730	* @param ppMem Where to store the memory object pointer.
731	* @param pv First page.
732	* @param cb Number of bytes.
733	* @param fAccess The desired access, a combination of RTMEM_PROT_READ
734	* and RTMEM_PROT_WRITE.
735	* @param Task The task \a pv and \a cb refers to.
736	*/
737	static int rtR0MemObjNativeLock(PPRTR0MEMOBJINTERNAL ppMem, void *pv, size_t cb, uint32_t fAccess, task_t Task)
738	{
739	NOREF(fAccess);
740	#ifdef USE_VM_MAP_WIRE
741	vm_map_t Map = get_task_map(Task);
742	Assert(Map);
743
744	/*
745	* First try lock the memory.
746	*/
747	int rc = VERR_LOCK_FAILED;
748	kern_return_t kr = vm_map_wire(get_task_map(Task),
749	(vm_map_offset_t)pv,
750	(vm_map_offset_t)pv + cb,
751	VM_PROT_DEFAULT,
752	0 /* not user */);
753	if (kr == KERN_SUCCESS)
754	{
755	/*
756	* Create the IPRT memory object.
757	*/
758	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), RTR0MEMOBJTYPE_LOCK, pv, cb);
759	if (pMemDarwin)
760	{
761	pMemDarwin->Core.u.Lock.R0Process = (RTR0PROCESS)Task;
762	*ppMem = &pMemDarwin->Core;
763	return VINF_SUCCESS;
764	}
765
766	kr = vm_map_unwire(get_task_map(Task), (vm_map_offset_t)pv, (vm_map_offset_t)pv + cb, 0 /* not user */);
767	Assert(kr == KERN_SUCCESS);
768	rc = VERR_NO_MEMORY;
769	}
770
771	#else
772
773	/*
774	* Create a descriptor and try lock it (prepare).
775	*/
776	int rc = VERR_MEMOBJ_INIT_FAILED;
777	IOMemoryDescriptor *pMemDesc = IOMemoryDescriptor::withAddressRange((vm_address_t)pv, cb, kIODirectionInOut, Task);
778	if (pMemDesc)
779	{
780	IOReturn IORet = pMemDesc->prepare(kIODirectionInOut);
781	if (IORet == kIOReturnSuccess)
782	{
783	/*
784	* Create the IPRT memory object.
785	*/
786	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), RTR0MEMOBJTYPE_LOCK, pv, cb);
787	if (pMemDarwin)
788	{
789	pMemDarwin->Core.u.Lock.R0Process = (RTR0PROCESS)Task;
790	pMemDarwin->pMemDesc = pMemDesc;
791	*ppMem = &pMemDarwin->Core;
792	return VINF_SUCCESS;
793	}
794
795	pMemDesc->complete();
796	rc = VERR_NO_MEMORY;
797	}
798	else
799	rc = VERR_LOCK_FAILED;
800	pMemDesc->release();
801	}
802	#endif
803	return rc;
804	}
805
806
807	DECLHIDDEN(int) rtR0MemObjNativeLockUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3Ptr, size_t cb, uint32_t fAccess, RTR0PROCESS R0Process)
808	{
809	return rtR0MemObjNativeLock(ppMem, (void *)R3Ptr, cb, fAccess, (task_t)R0Process);
810	}
811
812
813	DECLHIDDEN(int) rtR0MemObjNativeLockKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pv, size_t cb, uint32_t fAccess)
814	{
815	return rtR0MemObjNativeLock(ppMem, pv, cb, fAccess, kernel_task);
816	}
817
818
819	DECLHIDDEN(int) rtR0MemObjNativeReserveKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pvFixed, size_t cb, size_t uAlignment)
820	{
821	return VERR_NOT_SUPPORTED;
822	}
823
824
825	DECLHIDDEN(int) rtR0MemObjNativeReserveUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment, RTR0PROCESS R0Process)
826	{
827	return VERR_NOT_SUPPORTED;
828	}
829
830
831	DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, void *pvFixed, size_t uAlignment,
832	unsigned fProt, size_t offSub, size_t cbSub)
833	{
834	AssertReturn(pvFixed == (void *)-1, VERR_NOT_SUPPORTED);
835
836	/*
837	* Check that the specified alignment is supported.
838	*/
839	if (uAlignment > PAGE_SIZE)
840	return VERR_NOT_SUPPORTED;
841
842	/*
843	* Must have a memory descriptor that we can map.
844	*/
845	int rc = VERR_INVALID_PARAMETER;
846	PRTR0MEMOBJDARWIN pMemToMapDarwin = (PRTR0MEMOBJDARWIN)pMemToMap;
847	if (pMemToMapDarwin->pMemDesc)
848	{
849	#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
850	IOMemoryMap *pMemMap = pMemToMapDarwin->pMemDesc->createMappingInTask(kernel_task,
851	0,
852	kIOMapAnywhere \| kIOMapDefaultCache,
853	offSub,
854	cbSub);
855	#else
856	IOMemoryMap *pMemMap = pMemToMapDarwin->pMemDesc->map(kernel_task,
857	0,
858	kIOMapAnywhere \| kIOMapDefaultCache,
859	offSub,
860	cbSub);
861	#endif
862	if (pMemMap)
863	{
864	IOVirtualAddress VirtAddr = pMemMap->getVirtualAddress();
865	void pv = (void )(uintptr_t)VirtAddr;
866	if ((uintptr_t)pv == VirtAddr)
867	{
868	//addr64_t Addr = pMemToMapDarwin->pMemDesc->getPhysicalSegment64(offSub, NULL);
869	//printf("pv=%p: %8llx %8llx\n", pv, rtR0MemObjDarwinGetPTE(pv), Addr);
870
871	// /*
872	// * Explicitly lock it so that we're sure it is present and that
873	// * its PTEs cannot be recycled.
874	// * Note! withAddressRange() doesn't work as it adds kIOMemoryTypeVirtual64
875	// * to the options which causes prepare() to not wire the pages.
876	// * This is probably a bug.
877	// */
878	// IOAddressRange Range = { (mach_vm_address_t)pv, cbSub };
879	// IOMemoryDescriptor *pMemDesc = IOMemoryDescriptor::withOptions(&Range,
880	// 1 /* count */,
881	// 0 /* offset */,
882	// kernel_task,
883	// kIODirectionInOut \| kIOMemoryTypeVirtual,
884	// kIOMapperSystem);
885	// if (pMemDesc)
886	// {
887	// IOReturn IORet = pMemDesc->prepare(kIODirectionInOut);
888	// if (IORet == kIOReturnSuccess)
889	// {
890	/* HACK ALERT! */
891	rtR0MemObjDarwinTouchPages(pv, cbSub);
892	/** @todo First, the memory should've been mapped by now, and second, it
893	* should have the wired attribute in the PTE (bit 9). Neither
894	* seems to be the case. The disabled locking code doesn't make any
895	* difference, which is extremely odd, and breaks
896	* rtR0MemObjNativeGetPagePhysAddr (getPhysicalSegment64 -> 64 for the
897	* lock descriptor. */
898	//addr64_t Addr = pMemDesc->getPhysicalSegment64(0, NULL);
899	//printf("pv=%p: %8llx %8llx (%d)\n", pv, rtR0MemObjDarwinGetPTE(pv), Addr, 2);
900
901	/*
902	* Create the IPRT memory object.
903	*/
904	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), RTR0MEMOBJTYPE_MAPPING,
905	pv, cbSub);
906	if (pMemDarwin)
907	{
908	pMemDarwin->Core.u.Mapping.R0Process = NIL_RTR0PROCESS;
909	pMemDarwin->pMemMap = pMemMap;
910	// pMemDarwin->pMemDesc = pMemDesc;
911	*ppMem = &pMemDarwin->Core;
912	return VINF_SUCCESS;
913	}
914
915	// pMemDesc->complete();
916	// rc = VERR_NO_MEMORY;
917	// }
918	// else
919	// rc = RTErrConvertFromDarwinIO(IORet);
920	// pMemDesc->release();
921	// }
922	// else
923	// rc = VERR_MEMOBJ_INIT_FAILED;
924	}
925	else
926	rc = VERR_ADDRESS_TOO_BIG;
927	pMemMap->release();
928	}
929	else
930	rc = VERR_MAP_FAILED;
931	}
932	return rc;
933	}
934
935
936	DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, RTR3PTR R3PtrFixed, size_t uAlignment, unsigned fProt, RTR0PROCESS R0Process)
937	{
938	/*
939	* Check for unsupported things.
940	*/
941	AssertReturn(R3PtrFixed == (RTR3PTR)-1, VERR_NOT_SUPPORTED);
942	if (uAlignment > PAGE_SIZE)
943	return VERR_NOT_SUPPORTED;
944
945	/*
946	* Must have a memory descriptor.
947	*/
948	int rc = VERR_INVALID_PARAMETER;
949	PRTR0MEMOBJDARWIN pMemToMapDarwin = (PRTR0MEMOBJDARWIN)pMemToMap;
950	if (pMemToMapDarwin->pMemDesc)
951	{
952	#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1050
953	IOMemoryMap *pMemMap = pMemToMapDarwin->pMemDesc->createMappingInTask((task_t)R0Process,
954	0,
955	kIOMapAnywhere \| kIOMapDefaultCache,
956	0 /* offset */,
957	0 /* length */);
958	#else
959	IOMemoryMap *pMemMap = pMemToMapDarwin->pMemDesc->map((task_t)R0Process,
960	0,
961	kIOMapAnywhere \| kIOMapDefaultCache);
962	#endif
963	if (pMemMap)
964	{
965	IOVirtualAddress VirtAddr = pMemMap->getVirtualAddress();
966	void pv = (void )(uintptr_t)VirtAddr;
967	if ((uintptr_t)pv == VirtAddr)
968	{
969	/*
970	* Create the IPRT memory object.
971	*/
972	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)rtR0MemObjNew(sizeof(*pMemDarwin), RTR0MEMOBJTYPE_MAPPING,
973	pv, pMemToMapDarwin->Core.cb);
974	if (pMemDarwin)
975	{
976	pMemDarwin->Core.u.Mapping.R0Process = R0Process;
977	pMemDarwin->pMemMap = pMemMap;
978	*ppMem = &pMemDarwin->Core;
979	return VINF_SUCCESS;
980	}
981
982	rc = VERR_NO_MEMORY;
983	}
984	else
985	rc = VERR_ADDRESS_TOO_BIG;
986	pMemMap->release();
987	}
988	else
989	rc = VERR_MAP_FAILED;
990	}
991	return rc;
992	}
993
994
995	DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
996	{
997	/* Get the map for the object. */
998	vm_map_t pVmMap = rtR0MemObjDarwinGetMap(pMem);
999	if (!pVmMap)
1000	return VERR_NOT_SUPPORTED;
1001
1002	/*
1003	* Convert the protection.
1004	*/
1005	vm_prot_t fMachProt;
1006	switch (fProt)
1007	{
1008	case RTMEM_PROT_NONE:
1009	fMachProt = VM_PROT_NONE;
1010	break;
1011	case RTMEM_PROT_READ:
1012	fMachProt = VM_PROT_READ;
1013	break;
1014	case RTMEM_PROT_READ \| RTMEM_PROT_WRITE:
1015	fMachProt = VM_PROT_READ \| VM_PROT_WRITE;
1016	break;
1017	case RTMEM_PROT_READ \| RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC:
1018	fMachProt = VM_PROT_READ \| VM_PROT_WRITE \| VM_PROT_EXECUTE;
1019	break;
1020	case RTMEM_PROT_WRITE:
1021	fMachProt = VM_PROT_WRITE \| VM_PROT_READ; /* never write-only */
1022	break;
1023	case RTMEM_PROT_WRITE \| RTMEM_PROT_EXEC:
1024	fMachProt = VM_PROT_WRITE \| VM_PROT_EXECUTE \| VM_PROT_READ; /* never write-only or execute-only */
1025	break;
1026	case RTMEM_PROT_EXEC:
1027	fMachProt = VM_PROT_EXECUTE \| VM_PROT_READ; /* never execute-only */
1028	break;
1029	default:
1030	AssertFailedReturn(VERR_INVALID_PARAMETER);
1031	}
1032
1033	/*
1034	* Do the job.
1035	*/
1036	vm_offset_t Start = (uintptr_t)pMem->pv + offSub;
1037	kern_return_t krc = vm_protect(pVmMap,
1038	Start,
1039	cbSub,
1040	false,
1041	fMachProt);
1042	if (krc != KERN_SUCCESS)
1043	{
1044	static int s_cComplaints = 0;
1045	if (s_cComplaints < 10)
1046	{
1047	s_cComplaints++;
1048	printf("rtR0MemObjNativeProtect: vm_protect(%p,%p,%p,false,%#x) -> %d\n",
1049	pVmMap, (void )Start, (void )cbSub, fMachProt, krc);
1050
1051	kern_return_t krc2;
1052	vm_offset_t pvReal = Start;
1053	vm_size_t cbReal = 0;
1054	mach_msg_type_number_t cInfo = VM_REGION_BASIC_INFO_COUNT;
1055	struct vm_region_basic_info Info;
1056	RT_ZERO(Info);
1057	krc2 = vm_region(pVmMap, &pvReal, &cbReal, VM_REGION_BASIC_INFO, (vm_region_info_t)&Info, &cInfo, NULL);
1058	printf("rtR0MemObjNativeProtect: basic info - krc2=%d pv=%p cb=%p prot=%#x max=%#x inh=%#x shr=%d rvd=%d off=%#x behavior=%#x wired=%#x\n",
1059	krc2, (void )pvReal, (void )cbReal, Info.protection, Info.max_protection, Info.inheritance,
1060	Info.shared, Info.reserved, Info.offset, Info.behavior, Info.user_wired_count);
1061	}
1062	return RTErrConvertFromDarwinKern(krc);
1063	}
1064
1065	/*
1066	* Touch the pages if they should be writable afterwards and accessible
1067	* from code which should never fault. vm_protect() may leave pages
1068	* temporarily write protected, possibly due to pmap no-upgrade rules?
1069	*
1070	* This is the same trick (or HACK ALERT if you like) as applied in
1071	* rtR0MemObjNativeMapKernel.
1072	*/
1073	if ( pMem->enmType != RTR0MEMOBJTYPE_MAPPING
1074	\|\| pMem->u.Mapping.R0Process == NIL_RTR0PROCESS)
1075	{
1076	if (fProt & RTMEM_PROT_WRITE)
1077	rtR0MemObjDarwinTouchPages((void *)Start, cbSub);
1078	/*
1079	* Sniff (read) read-only pages too, just to be sure.
1080	*/
1081	else if (fProt & (RTMEM_PROT_READ \| RTMEM_PROT_EXEC))
1082	rtR0MemObjDarwinSniffPages((void const *)Start, cbSub);
1083	}
1084
1085	return VINF_SUCCESS;
1086	}
1087
1088
1089	DECLHIDDEN(RTHCPHYS) rtR0MemObjNativeGetPagePhysAddr(PRTR0MEMOBJINTERNAL pMem, size_t iPage)
1090	{
1091	RTHCPHYS PhysAddr;
1092	PRTR0MEMOBJDARWIN pMemDarwin = (PRTR0MEMOBJDARWIN)pMem;
1093
1094	#ifdef USE_VM_MAP_WIRE
1095	/*
1096	* Locked memory doesn't have a memory descriptor and
1097	* needs to be handled differently.
1098	*/
1099	if (pMemDarwin->Core.enmType == RTR0MEMOBJTYPE_LOCK)
1100	{
1101	ppnum_t PgNo;
1102	if (pMemDarwin->Core.u.Lock.R0Process == NIL_RTR0PROCESS)
1103	PgNo = pmap_find_phys(kernel_pmap, (uintptr_t)pMemDarwin->Core.pv + iPage * PAGE_SIZE);
1104	else
1105	{
1106	/*
1107	* From what I can tell, Apple seems to have locked up the all the
1108	* available interfaces that could help us obtain the pmap_t of a task
1109	* or vm_map_t.
1110
1111	* So, we'll have to figure out where in the vm_map_t structure it is
1112	* and read it our selves. ASSUMING that kernel_pmap is pointed to by
1113	* kernel_map->pmap, we scan kernel_map to locate the structure offset.
1114	* Not nice, but it will hopefully do the job in a reliable manner...
1115	*
1116	* (get_task_pmap, get_map_pmap or vm_map_pmap is what we really need btw.)
1117	*/
1118	static int s_offPmap = -1;
1119	if (RT_UNLIKELY(s_offPmap == -1))
1120	{
1121	pmap_t const p = (pmap_t )kernel_map;
1122	pmap_t const * const pEnd = p + 64;
1123	for (; p < pEnd; p++)
1124	if (*p == kernel_pmap)
1125	{
1126	s_offPmap = (uintptr_t)p - (uintptr_t)kernel_map;
1127	break;
1128	}
1129	AssertReturn(s_offPmap >= 0, NIL_RTHCPHYS);
1130	}
1131	pmap_t Pmap = (pmap_t )((uintptr_t)get_task_map((task_t)pMemDarwin->Core.u.Lock.R0Process) + s_offPmap);
1132	PgNo = pmap_find_phys(Pmap, (uintptr_t)pMemDarwin->Core.pv + iPage * PAGE_SIZE);
1133	}
1134
1135	AssertReturn(PgNo, NIL_RTHCPHYS);
1136	PhysAddr = (RTHCPHYS)PgNo << PAGE_SHIFT;
1137	Assert((PhysAddr >> PAGE_SHIFT) == PgNo);
1138	}
1139	else
1140	#endif /* USE_VM_MAP_WIRE */
1141	{
1142	/*
1143	* Get the memory descriptor.
1144	*/
1145	IOMemoryDescriptor *pMemDesc = pMemDarwin->pMemDesc;
1146	if (!pMemDesc)
1147	pMemDesc = pMemDarwin->pMemMap->getMemoryDescriptor();
1148	AssertReturn(pMemDesc, NIL_RTHCPHYS);
1149
1150	/*
1151	* If we've got a memory descriptor, use getPhysicalSegment64().
1152	*/
1153	#ifdef __LP64__ /* Grumble! */
1154	addr64_t Addr = pMemDesc->getPhysicalSegment(iPage * PAGE_SIZE, NULL);
1155	#else
1156	addr64_t Addr = pMemDesc->getPhysicalSegment64(iPage * PAGE_SIZE, NULL);
1157	#endif
1158	AssertMsgReturn(Addr, ("iPage=%u\n", iPage), NIL_RTHCPHYS);
1159	PhysAddr = Addr;
1160	AssertMsgReturn(PhysAddr == Addr, ("PhysAddr=%RHp Addr=%RX64\n", PhysAddr, (uint64_t)Addr), NIL_RTHCPHYS);
1161	}
1162
1163	return PhysAddr;
1164	}
1165

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source: vbox/trunk/src/VBox/Runtime/r0drv/darwin/memobj-r0drv-darwin.cpp@ 43355

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