timer-r0drv-nt.cpp@ 85561

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1	/* $Id: timer-r0drv-nt.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* IPRT - Timers, Ring-0 Driver, NT.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 Oracle Corporation
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
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "the-nt-kernel.h"
32
33	#include <iprt/timer.h>
34	#include <iprt/mp.h>
35	#include <iprt/cpuset.h>
36	#include <iprt/err.h>
37	#include <iprt/asm.h>
38	#include <iprt/assert.h>
39	#include <iprt/mem.h>
40	#include <iprt/thread.h>
41
42	#include "internal-r0drv-nt.h"
43	#include "internal/magics.h"
44
45	/** This seems to provide better accuracy. */
46	#define RTR0TIMER_NT_MANUAL_RE_ARM 1
47
48
49	/*********************************************************************************************************************************
50	* Structures and Typedefs *
51	*********************************************************************************************************************************/
52	/**
53	* A sub timer structure.
54	*
55	* This is used for keeping the per-cpu tick and DPC object.
56	*/
57	typedef struct RTTIMERNTSUBTIMER
58	{
59	/** The tick counter. */
60	uint64_t iTick;
61	/** Pointer to the parent timer. */
62	PRTTIMER pParent;
63	/** Thread active executing the worker function, NIL if inactive. */
64	RTNATIVETHREAD volatile hActiveThread;
65	/** The NT DPC object. */
66	KDPC NtDpc;
67	} RTTIMERNTSUBTIMER;
68	/** Pointer to a NT sub-timer structure. */
69	typedef RTTIMERNTSUBTIMER *PRTTIMERNTSUBTIMER;
70
71	/**
72	* The internal representation of an Linux timer handle.
73	*/
74	typedef struct RTTIMER
75	{
76	/** Magic.
77	* This is RTTIMER_MAGIC, but changes to something else before the timer
78	* is destroyed to indicate clearly that thread should exit. */
79	uint32_t volatile u32Magic;
80	/** Suspend count down for single shot omnit timers. */
81	int32_t volatile cOmniSuspendCountDown;
82	/** Flag indicating the timer is suspended. */
83	bool volatile fSuspended;
84	/** Whether the timer must run on one specific CPU or not. */
85	bool fSpecificCpu;
86	/** Whether the timer must run on all CPUs or not. */
87	bool fOmniTimer;
88	/** The CPU it must run on if fSpecificCpu is set.
89	* The master CPU for an omni-timer. */
90	RTCPUID idCpu;
91	/** Callback. */
92	PFNRTTIMER pfnTimer;
93	/** User argument. */
94	void *pvUser;
95	/** The timer interval. 0 if one-shot. */
96	uint64_t u64NanoInterval;
97	#ifdef RTR0TIMER_NT_MANUAL_RE_ARM
98	/** The desired NT time of the first tick. */
99	uint64_t uNtStartTime;
100	#endif
101	/** The Nt timer object. */
102	KTIMER NtTimer;
103	/** The number of sub-timers. */
104	RTCPUID cSubTimers;
105	/** Sub-timers.
106	* Normally there is just one, but for RTTIMER_FLAGS_CPU_ALL this will contain
107	* an entry for all possible cpus. In that case the index will be the same as
108	* for the RTCpuSet. */
109	RTTIMERNTSUBTIMER aSubTimers[1];
110	} RTTIMER;
111
112
113	#ifdef RTR0TIMER_NT_MANUAL_RE_ARM
114	/**
115	* Get current NT interrupt time.
116	* @return NT interrupt time
117	*/
118	static uint64_t rtTimerNtQueryInterruptTime(void)
119	{
120	# ifdef RT_ARCH_AMD64
121	return KeQueryInterruptTime(); /* macro */
122	# else
123	if (g_pfnrtKeQueryInterruptTime)
124	return g_pfnrtKeQueryInterruptTime();
125
126	/* NT4 */
127	ULARGE_INTEGER InterruptTime;
128	do
129	{
130	InterruptTime.HighPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High1Time;
131	InterruptTime.LowPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.LowPart;
132	} while (((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High2Time != (LONG)InterruptTime.HighPart);
133	return InterruptTime.QuadPart;
134	# endif
135	}
136	#endif /* RTR0TIMER_NT_MANUAL_RE_ARM */
137
138
139	/**
140	* Manually re-arms an internval timer.
141	*
142	* Turns out NT doesn't necessarily do a very good job at re-arming timers
143	* accurately.
144	*
145	* @param pTimer The timer.
146	* @param iTick The current timer tick.
147	* @param pMasterDpc The master DPC.
148	*/
149	DECLINLINE(void) rtTimerNtRearmInternval(PRTTIMER pTimer, uint64_t iTick, PKDPC pMasterDpc)
150	{
151	#ifdef RTR0TIMER_NT_MANUAL_RE_ARM
152	Assert(pTimer->u64NanoInterval);
153	RT_NOREF1(pMasterDpc);
154
155	uint64_t uNtNext = (iTick * pTimer->u64NanoInterval) / 100 - 10; /* 1us fudge */
156	LARGE_INTEGER DueTime;
157	DueTime.QuadPart = rtTimerNtQueryInterruptTime() - pTimer->uNtStartTime;
158	if (DueTime.QuadPart < 0)
159	DueTime.QuadPart = 0;
160	if ((uint64_t)DueTime.QuadPart < uNtNext)
161	DueTime.QuadPart -= uNtNext;
162	else
163	DueTime.QuadPart = -2500; /* 0.25ms */
164
165	KeSetTimerEx(&pTimer->NtTimer, DueTime, 0, &pTimer->aSubTimers[0].NtDpc);
166	#else
167	RT_NOREF3(pTimer, iTick, pMasterDpc);
168	#endif
169	}
170
171
172	/**
173	* Timer callback function for the non-omni timers.
174	*
175	* @returns HRTIMER_NORESTART or HRTIMER_RESTART depending on whether it's a one-shot or interval timer.
176	* @param pDpc Pointer to the DPC.
177	* @param pvUser Pointer to our internal timer structure.
178	* @param SystemArgument1 Some system argument.
179	* @param SystemArgument2 Some system argument.
180	*/
181	static void _stdcall rtTimerNtSimpleCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2)
182	{
183	PRTTIMER pTimer = (PRTTIMER)pvUser;
184	AssertPtr(pTimer);
185	#ifdef RT_STRICT
186	if (KeGetCurrentIrql() < DISPATCH_LEVEL)
187	RTAssertMsg2Weak("rtTimerNtSimpleCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL);
188	#endif
189
190	/*
191	* Check that we haven't been suspended before doing the callout.
192	*/
193	if ( !ASMAtomicUoReadBool(&pTimer->fSuspended)
194	&& pTimer->u32Magic == RTTIMER_MAGIC)
195	{
196	ASMAtomicWriteHandle(&pTimer->aSubTimers[0].hActiveThread, RTThreadNativeSelf());
197
198	if (!pTimer->u64NanoInterval)
199	ASMAtomicWriteBool(&pTimer->fSuspended, true);
200	uint64_t iTick = ++pTimer->aSubTimers[0].iTick;
201	if (pTimer->u64NanoInterval)
202	rtTimerNtRearmInternval(pTimer, iTick, &pTimer->aSubTimers[0].NtDpc);
203	pTimer->pfnTimer(pTimer, pTimer->pvUser, iTick);
204
205	ASMAtomicWriteHandle(&pTimer->aSubTimers[0].hActiveThread, NIL_RTNATIVETHREAD);
206	}
207
208	NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2);
209	}
210
211
212	/**
213	* The slave DPC callback for an omni timer.
214	*
215	* @param pDpc The DPC object.
216	* @param pvUser Pointer to the sub-timer.
217	* @param SystemArgument1 Some system stuff.
218	* @param SystemArgument2 Some system stuff.
219	*/
220	static void _stdcall rtTimerNtOmniSlaveCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2)
221	{
222	PRTTIMERNTSUBTIMER pSubTimer = (PRTTIMERNTSUBTIMER)pvUser;
223	PRTTIMER pTimer = pSubTimer->pParent;
224
225	AssertPtr(pTimer);
226	#ifdef RT_STRICT
227	if (KeGetCurrentIrql() < DISPATCH_LEVEL)
228	RTAssertMsg2Weak("rtTimerNtOmniSlaveCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL);
229	int iCpuSelf = RTMpCpuIdToSetIndex(RTMpCpuId());
230	if (pSubTimer - &pTimer->aSubTimers[0] != iCpuSelf)
231	RTAssertMsg2Weak("rtTimerNtOmniSlaveCallback: iCpuSelf=%d pSubTimer=%p / %d\n", iCpuSelf, pSubTimer, pSubTimer - &pTimer->aSubTimers[0]);
232	#endif
233
234	/*
235	* Check that we haven't been suspended before doing the callout.
236	*/
237	if ( !ASMAtomicUoReadBool(&pTimer->fSuspended)
238	&& pTimer->u32Magic == RTTIMER_MAGIC)
239	{
240	ASMAtomicWriteHandle(&pSubTimer->hActiveThread, RTThreadNativeSelf());
241
242	if (!pTimer->u64NanoInterval)
243	if (ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown) <= 0)
244	ASMAtomicWriteBool(&pTimer->fSuspended, true);
245
246	pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pSubTimer->iTick);
247
248	ASMAtomicWriteHandle(&pSubTimer->hActiveThread, NIL_RTNATIVETHREAD);
249	}
250
251	NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2);
252	}
253
254
255	/**
256	* The timer callback for an omni-timer.
257	*
258	* This is responsible for queueing the DPCs for the other CPUs and
259	* perform the callback on the CPU on which it is called.
260	*
261	* @param pDpc The DPC object.
262	* @param pvUser Pointer to the sub-timer.
263	* @param SystemArgument1 Some system stuff.
264	* @param SystemArgument2 Some system stuff.
265	*/
266	static void _stdcall rtTimerNtOmniMasterCallback(IN PKDPC pDpc, IN PVOID pvUser, IN PVOID SystemArgument1, IN PVOID SystemArgument2)
267	{
268	PRTTIMERNTSUBTIMER pSubTimer = (PRTTIMERNTSUBTIMER)pvUser;
269	PRTTIMER pTimer = pSubTimer->pParent;
270	int iCpuSelf = RTMpCpuIdToSetIndex(RTMpCpuId());
271
272	AssertPtr(pTimer);
273	#ifdef RT_STRICT
274	if (KeGetCurrentIrql() < DISPATCH_LEVEL)
275	RTAssertMsg2Weak("rtTimerNtOmniMasterCallback: Irql=%d expected >=%d\n", KeGetCurrentIrql(), DISPATCH_LEVEL);
276	if (pSubTimer - &pTimer->aSubTimers[0] != iCpuSelf)
277	RTAssertMsg2Weak("rtTimerNtOmniMasterCallback: iCpuSelf=%d pSubTimer=%p / %d\n", iCpuSelf, pSubTimer, pSubTimer - &pTimer->aSubTimers[0]);
278	#endif
279
280	/*
281	* Check that we haven't been suspended before scheduling the other DPCs
282	* and doing the callout.
283	*/
284	if ( !ASMAtomicUoReadBool(&pTimer->fSuspended)
285	&& pTimer->u32Magic == RTTIMER_MAGIC)
286	{
287	RTCPUSET OnlineSet;
288	RTMpGetOnlineSet(&OnlineSet);
289
290	ASMAtomicWriteHandle(&pSubTimer->hActiveThread, RTThreadNativeSelf());
291
292	if (pTimer->u64NanoInterval)
293	{
294	/*
295	* Recurring timer.
296	*/
297	for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
298	if ( RTCpuSetIsMemberByIndex(&OnlineSet, iCpu)
299	&& iCpuSelf != iCpu)
300	KeInsertQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc, 0, 0);
301
302	uint64_t iTick = ++pSubTimer->iTick;
303	rtTimerNtRearmInternval(pTimer, iTick, &pTimer->aSubTimers[RTMpCpuIdToSetIndex(pTimer->idCpu)].NtDpc);
304	pTimer->pfnTimer(pTimer, pTimer->pvUser, iTick);
305	}
306	else
307	{
308	/*
309	* Single shot timers gets complicated wrt to fSuspended maintance.
310	*/
311	uint32_t cCpus = 0;
312	for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
313	if (RTCpuSetIsMemberByIndex(&OnlineSet, iCpu))
314	cCpus++;
315	ASMAtomicAddS32(&pTimer->cOmniSuspendCountDown, cCpus);
316
317	for (int iCpu = 0; iCpu < RTCPUSET_MAX_CPUS; iCpu++)
318	if ( RTCpuSetIsMemberByIndex(&OnlineSet, iCpu)
319	&& iCpuSelf != iCpu)
320	if (!KeInsertQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc, 0, 0))
321	ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown); /* already queued and counted. */
322
323	if (ASMAtomicDecS32(&pTimer->cOmniSuspendCountDown) <= 0)
324	ASMAtomicWriteBool(&pTimer->fSuspended, true);
325
326	pTimer->pfnTimer(pTimer, pTimer->pvUser, ++pSubTimer->iTick);
327	}
328
329	ASMAtomicWriteHandle(&pSubTimer->hActiveThread, NIL_RTNATIVETHREAD);
330	}
331
332	NOREF(pDpc); NOREF(SystemArgument1); NOREF(SystemArgument2);
333	}
334
335
336
337	RTDECL(int) RTTimerStart(PRTTIMER pTimer, uint64_t u64First)
338	{
339	/*
340	* Validate.
341	*/
342	AssertPtrReturn(pTimer, VERR_INVALID_HANDLE);
343	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE);
344
345	if (!ASMAtomicUoReadBool(&pTimer->fSuspended))
346	return VERR_TIMER_ACTIVE;
347	if ( pTimer->fSpecificCpu
348	&& !RTMpIsCpuOnline(pTimer->idCpu))
349	return VERR_CPU_OFFLINE;
350
351	/*
352	* Start the timer.
353	*/
354	PKDPC pMasterDpc = pTimer->fOmniTimer
355	? &pTimer->aSubTimers[RTMpCpuIdToSetIndex(pTimer->idCpu)].NtDpc
356	: &pTimer->aSubTimers[0].NtDpc;
357
358	#ifndef RTR0TIMER_NT_MANUAL_RE_ARM
359	uint64_t u64Interval = pTimer->u64NanoInterval / 1000000; /* This is ms, believe it or not. */
360	ULONG ulInterval = (ULONG)u64Interval;
361	if (ulInterval != u64Interval)
362	ulInterval = MAXLONG;
363	else if (!ulInterval && pTimer->u64NanoInterval)
364	ulInterval = 1;
365	#endif
366
367	LARGE_INTEGER DueTime;
368	DueTime.QuadPart = -(int64_t)(u64First / 100); /* Relative, NT time. */
369	if (!DueTime.QuadPart)
370	DueTime.QuadPart = -1;
371
372	unsigned cSubTimers = pTimer->fOmniTimer ? pTimer->cSubTimers : 1;
373	for (unsigned iCpu = 0; iCpu < cSubTimers; iCpu++)
374	pTimer->aSubTimers[iCpu].iTick = 0;
375	ASMAtomicWriteS32(&pTimer->cOmniSuspendCountDown, 0);
376	ASMAtomicWriteBool(&pTimer->fSuspended, false);
377	#ifdef RTR0TIMER_NT_MANUAL_RE_ARM
378	pTimer->uNtStartTime = rtTimerNtQueryInterruptTime() + u64First / 100;
379	KeSetTimerEx(&pTimer->NtTimer, DueTime, 0, pMasterDpc);
380	#else
381	KeSetTimerEx(&pTimer->NtTimer, DueTime, ulInterval, pMasterDpc);
382	#endif
383	return VINF_SUCCESS;
384	}
385
386
387	/**
388	* Worker function that stops an active timer.
389	*
390	* Shared by RTTimerStop and RTTimerDestroy.
391	*
392	* @param pTimer The active timer.
393	*/
394	static void rtTimerNtStopWorker(PRTTIMER pTimer)
395	{
396	/*
397	* Just cancel the timer, dequeue the DPCs and flush them (if this is supported).
398	*/
399	ASMAtomicWriteBool(&pTimer->fSuspended, true);
400
401	KeCancelTimer(&pTimer->NtTimer);
402
403	for (RTCPUID iCpu = 0; iCpu < pTimer->cSubTimers; iCpu++)
404	KeRemoveQueueDpc(&pTimer->aSubTimers[iCpu].NtDpc);
405	}
406
407
408	RTDECL(int) RTTimerStop(PRTTIMER pTimer)
409	{
410	/*
411	* Validate.
412	*/
413	AssertPtrReturn(pTimer, VERR_INVALID_HANDLE);
414	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE);
415
416	if (ASMAtomicUoReadBool(&pTimer->fSuspended))
417	return VERR_TIMER_SUSPENDED;
418
419	/*
420	* Call the worker we share with RTTimerDestroy.
421	*/
422	rtTimerNtStopWorker(pTimer);
423	return VINF_SUCCESS;
424	}
425
426
427	RTDECL(int) RTTimerChangeInterval(PRTTIMER pTimer, uint64_t u64NanoInterval)
428	{
429	AssertPtrReturn(pTimer, VERR_INVALID_HANDLE);
430	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE);
431	RT_NOREF1(u64NanoInterval);
432
433	return VERR_NOT_SUPPORTED;
434	}
435
436
437	RTDECL(int) RTTimerDestroy(PRTTIMER pTimer)
438	{
439	/* It's ok to pass NULL pointer. */
440	if (pTimer == /NIL_RTTIMER/ NULL)
441	return VINF_SUCCESS;
442	AssertPtrReturn(pTimer, VERR_INVALID_HANDLE);
443	AssertReturn(pTimer->u32Magic == RTTIMER_MAGIC, VERR_INVALID_HANDLE);
444
445	/*
446	* We do not support destroying a timer from the callback because it is
447	* not 101% safe since we cannot flush DPCs. Solaris has the same restriction.
448	*/
449	AssertReturn(KeGetCurrentIrql() == PASSIVE_LEVEL, VERR_INVALID_CONTEXT);
450
451	/*
452	* Invalidate the timer, stop it if it's running and finally
453	* free up the memory.
454	*/
455	ASMAtomicWriteU32(&pTimer->u32Magic, ~RTTIMER_MAGIC);
456	if (!ASMAtomicUoReadBool(&pTimer->fSuspended))
457	rtTimerNtStopWorker(pTimer);
458
459	/*
460	* Flush DPCs to be on the safe side.
461	*/
462	if (g_pfnrtNtKeFlushQueuedDpcs)
463	g_pfnrtNtKeFlushQueuedDpcs();
464
465	RTMemFree(pTimer);
466
467	return VINF_SUCCESS;
468	}
469
470
471	RTDECL(int) RTTimerCreateEx(PRTTIMER ppTimer, uint64_t u64NanoInterval, uint32_t fFlags, PFNRTTIMER pfnTimer, void pvUser)
472	{
473	*ppTimer = NULL;
474
475	/*
476	* Validate flags.
477	*/
478	if (!RTTIMER_FLAGS_ARE_VALID(fFlags))
479	return VERR_INVALID_PARAMETER;
480	if ( (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC)
481	&& (fFlags & RTTIMER_FLAGS_CPU_ALL) != RTTIMER_FLAGS_CPU_ALL
482	&& !RTMpIsCpuPossible(RTMpCpuIdFromSetIndex(fFlags & RTTIMER_FLAGS_CPU_MASK)))
483	return VERR_CPU_NOT_FOUND;
484
485	/*
486	* Allocate the timer handler.
487	*/
488	RTCPUID cSubTimers = 1;
489	if ((fFlags & RTTIMER_FLAGS_CPU_ALL) == RTTIMER_FLAGS_CPU_ALL)
490	{
491	cSubTimers = RTMpGetMaxCpuId() + 1;
492	Assert(cSubTimers <= RTCPUSET_MAX_CPUS); /* On Windows we have a 1:1 relationship between cpuid and set index. */
493	}
494
495	PRTTIMER pTimer = (PRTTIMER)RTMemAllocZ(RT_UOFFSETOF_DYN(RTTIMER, aSubTimers[cSubTimers]));
496	if (!pTimer)
497	return VERR_NO_MEMORY;
498
499	/*
500	* Initialize it.
501	*/
502	pTimer->u32Magic = RTTIMER_MAGIC;
503	pTimer->cOmniSuspendCountDown = 0;
504	pTimer->fSuspended = true;
505	pTimer->fSpecificCpu = (fFlags & RTTIMER_FLAGS_CPU_SPECIFIC) && (fFlags & RTTIMER_FLAGS_CPU_ALL) != RTTIMER_FLAGS_CPU_ALL;
506	pTimer->fOmniTimer = (fFlags & RTTIMER_FLAGS_CPU_ALL) == RTTIMER_FLAGS_CPU_ALL;
507	pTimer->idCpu = pTimer->fSpecificCpu ? RTMpCpuIdFromSetIndex(fFlags & RTTIMER_FLAGS_CPU_MASK) : NIL_RTCPUID;
508	pTimer->cSubTimers = cSubTimers;
509	pTimer->pfnTimer = pfnTimer;
510	pTimer->pvUser = pvUser;
511	pTimer->u64NanoInterval = u64NanoInterval;
512	if (g_pfnrtKeInitializeTimerEx)
513	g_pfnrtKeInitializeTimerEx(&pTimer->NtTimer, SynchronizationTimer);
514	else
515	KeInitializeTimer(&pTimer->NtTimer);
516	int rc = VINF_SUCCESS;
517	if (pTimer->fOmniTimer)
518	{
519	/*
520	* Initialize the per-cpu "sub-timers", select the first online cpu
521	* to be the master.
522	* ASSUMES that no cpus will ever go offline.
523	*/
524	pTimer->idCpu = NIL_RTCPUID;
525	for (unsigned iCpu = 0; iCpu < cSubTimers && RT_SUCCESS(rc); iCpu++)
526	{
527	pTimer->aSubTimers[iCpu].iTick = 0;
528	pTimer->aSubTimers[iCpu].pParent = pTimer;
529
530	if ( pTimer->idCpu == NIL_RTCPUID
531	&& RTMpIsCpuOnline(RTMpCpuIdFromSetIndex(iCpu)))
532	{
533	pTimer->idCpu = RTMpCpuIdFromSetIndex(iCpu);
534	KeInitializeDpc(&pTimer->aSubTimers[iCpu].NtDpc, rtTimerNtOmniMasterCallback, &pTimer->aSubTimers[iCpu]);
535	}
536	else
537	KeInitializeDpc(&pTimer->aSubTimers[iCpu].NtDpc, rtTimerNtOmniSlaveCallback, &pTimer->aSubTimers[iCpu]);
538	if (g_pfnrtKeSetImportanceDpc)
539	g_pfnrtKeSetImportanceDpc(&pTimer->aSubTimers[iCpu].NtDpc, HighImportance);
540	rc = rtMpNtSetTargetProcessorDpc(&pTimer->aSubTimers[iCpu].NtDpc, iCpu);
541	}
542	Assert(pTimer->idCpu != NIL_RTCPUID);
543	}
544	else
545	{
546	/*
547	* Initialize the first "sub-timer", target the DPC on a specific processor
548	* if requested to do so.
549	*/
550	pTimer->aSubTimers[0].iTick = 0;
551	pTimer->aSubTimers[0].pParent = pTimer;
552
553	KeInitializeDpc(&pTimer->aSubTimers[0].NtDpc, rtTimerNtSimpleCallback, pTimer);
554	if (g_pfnrtKeSetImportanceDpc)
555	g_pfnrtKeSetImportanceDpc(&pTimer->aSubTimers[0].NtDpc, HighImportance);
556	if (pTimer->fSpecificCpu)
557	rc = rtMpNtSetTargetProcessorDpc(&pTimer->aSubTimers[0].NtDpc, (int)pTimer->idCpu);
558	}
559	if (RT_SUCCESS(rc))
560	{
561	*ppTimer = pTimer;
562	return VINF_SUCCESS;
563	}
564
565	RTMemFree(pTimer);
566	return rc;
567	}
568
569
570	RTDECL(int) RTTimerRequestSystemGranularity(uint32_t u32Request, uint32_t *pu32Granted)
571	{
572	if (!g_pfnrtNtExSetTimerResolution)
573	return VERR_NOT_SUPPORTED;
574
575	ULONG ulGranted = g_pfnrtNtExSetTimerResolution(u32Request / 100, TRUE);
576	if (pu32Granted)
577	pu32Granted = ulGranted 100; /* NT -> ns */
578	return VINF_SUCCESS;
579	}
580
581
582	RTDECL(int) RTTimerReleaseSystemGranularity(uint32_t u32Granted)
583	{
584	if (!g_pfnrtNtExSetTimerResolution)
585	return VERR_NOT_SUPPORTED;
586
587	g_pfnrtNtExSetTimerResolution(0 /* ignored */, FALSE);
588	NOREF(u32Granted);
589	return VINF_SUCCESS;
590	}
591
592
593	RTDECL(bool) RTTimerCanDoHighResolution(void)
594	{
595	return false;
596	}
597

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source: vbox/trunk/src/VBox/Runtime/r0drv/nt/timer-r0drv-nt.cpp@ 85561

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