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/* $Id: time-r0drv-nt.cpp $ */
/** @file
* IPRT - Time, Ring-0 Driver, Nt.
*/
/*
* Copyright (C) 2007-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#include "the-nt-kernel.h"
#include "internal-r0drv-nt.h"
#include <iprt/time.h>
/*
* The KeQueryTickCount macro isn't compatible with NT 3.1, use the
* exported KPI instead.
*/
#ifdef RT_ARCH_X86
# undef KeQueryTickCount
extern "C" NTKERNELAPI void NTAPI KeQueryTickCount(PLARGE_INTEGER);
#endif
DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
{
/*
* Note! The time source we use here must be exactly the same as in
* the ring-3 code!
*
* Using interrupt time is the simplest and requires the least calculation.
* It is also accounting for suspended time. Unfortuantely, there is no
* ring-3 for reading it... but that won't stop us.
*
* Using the tick count is problematic in ring-3 on older windows version
* as we can only get the 32-bit tick value, i.e. we'll roll over sooner or
* later.
*/
#if 1
/* Interrupt time. */
LARGE_INTEGER InterruptTime;
if (g_pfnrtKeQueryInterruptTimePrecise)
{
ULONG64 QpcTsIgnored;
InterruptTime.QuadPart = g_pfnrtKeQueryInterruptTimePrecise(&QpcTsIgnored);
}
# ifdef RT_ARCH_X86
else if (g_pfnrtKeQueryInterruptTime) /* W2K+ */
InterruptTime.QuadPart = g_pfnrtKeQueryInterruptTime();
else if (g_uRtNtVersion >= RTNT_MAKE_VERSION(3, 50))
{
/* NT 3.50 and later, also pre-init: Use the user shared data. */
do
{
InterruptTime.HighPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High1Time;
InterruptTime.LowPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.LowPart;
} while (((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High2Time != InterruptTime.HighPart);
}
else
{
/*
* There is no KUSER_SHARED_DATA structure on NT 3.1, so we have no choice
* but to use the tick count. We must also avoid the KeQueryTickCount macro
* in the WDK, since NT 3.1 does have the KeTickCount data export either (see above).
*/
static ULONG volatile s_uTimeIncrement = 0;
ULONG uTimeIncrement = s_uTimeIncrement;
if (!uTimeIncrement)
{
uTimeIncrement = KeQueryTimeIncrement();
Assert(uTimeIncrement != 0);
Assert(uTimeIncrement * 100 / 100 == uTimeIncrement);
uTimeIncrement *= 100;
s_uTimeIncrement = uTimeIncrement;
}
KeQueryTickCount(&InterruptTime);
return (uint64_t)InterruptTime.QuadPart * uTimeIncrement;
}
# else
else
InterruptTime.QuadPart = KeQueryInterruptTime(); /* Macro on AMD64. */
# endif
return (uint64_t)InterruptTime.QuadPart * 100;
#else
/* Tick count. Works all the way back to NT 3.1 with #undef above. */
LARGE_INTEGER Tick;
KeQueryTickCount(&Tick);
return (uint64_t)Tick.QuadPart * KeQueryTimeIncrement() * 100;
#endif
}
RTDECL(uint64_t) RTTimeNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
RTDECL(uint64_t) RTTimeMilliTS(void)
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
LARGE_INTEGER SystemTime;
if (g_pfnrtKeQuerySystemTimePrecise)
g_pfnrtKeQuerySystemTimePrecise(&SystemTime);
else
KeQuerySystemTime(&SystemTime); /* Macro on AMD64, export on X86. */
return RTTimeSpecSetNtTime(pTime, SystemTime.QuadPart);
}
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