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/* $Id: time-nt.cpp $ */
/** @file
* IPRT - Time, Windows.
*/
/*
* Copyright (C) 2006-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#include "internal-r3-nt.h"
#include <iprt/time.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/ldr.h>
#include <iprt/uint128.h>
#include "internal/time.h"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Whether we've tried to resolve g_pfnRtlGetSystemTimePrecise or not. */
static bool g_fInitialized = false;
/** Pointer to RtlGetSystemTimePrecise, added in 6.2 (windows 8). */
static PFNRTLGETSYSTEMTIMEPRECISE g_pfnRtlGetSystemTimePrecise = NULL;
/**
* Initializes globals.
*/
static void rtTimeNtInitialize(void)
{
/*
* Make sure we don't recurse here when calling into RTLdr.
*/
if (ASMAtomicCmpXchgBool(&g_fInitialized, true, false))
{
void *pvFunc = RTLdrGetSystemSymbol("ntdll.dll", "RtlGetSystemTimePrecise");
if (pvFunc)
ASMAtomicWritePtr((void * volatile *)&g_pfnRtlGetSystemTimePrecise, pvFunc);
ASMCompilerBarrier();
}
}
static uint64_t rtTimeGetSystemNanoTS(void)
{
if (RT_UNLIKELY(!g_fInitialized))
rtTimeNtInitialize();
KUSER_SHARED_DATA volatile *pUserSharedData = (KUSER_SHARED_DATA volatile *)MM_SHARED_USER_DATA_VA;
#if 1
/*
* If there is precise time, get the precise system time and calculate the
* interrupt time from it. (Microsoft doesn't expose interrupt time to user
* application, which is very unfortunate as there are a lot place where
* monotonic time is applicable but developer is "forced" to use wall clock.)
*/
if (g_pfnRtlGetSystemTimePrecise)
{
for (;;)
{
uint64_t uUpdateLockBefore;
while ((uUpdateLockBefore = pUserSharedData->TimeUpdateLock) & 1)
ASMNopPause();
uint64_t uInterruptTime = *(uint64_t volatile *)&pUserSharedData->InterruptTime;
uint64_t uBaselineInterruptTimeQpc = pUserSharedData->BaselineInterruptTimeQpc;
uint64_t uQpcInterruptTimeIncrement = pUserSharedData->QpcInterruptTimeIncrement;
uint8_t uQpcInterruptTimeIncrementShift = pUserSharedData->QpcInterruptTimeIncrementShift;
LARGE_INTEGER QpcValue;
RtlQueryPerformanceCounter(&QpcValue);
if (pUserSharedData->TimeUpdateLock == uUpdateLockBefore)
{
uint64_t uQpcValue = QpcValue.QuadPart;
if (uQpcValue <= uBaselineInterruptTimeQpc)
return uInterruptTime * 100;
/* Calc QPC delta since base line. */
uQpcValue -= uBaselineInterruptTimeQpc;
uQpcValue--;
/* Multiply by 10 million. */
uQpcValue *= UINT32_C(10000000);
/* Multiply by QPC interrupt time increment value. */
RTUINT128U Tmp128;
RTUInt128MulU64ByU64(&Tmp128, uQpcValue, uQpcInterruptTimeIncrement);
/* Shift the upper 64 bits by the increment shift factor. */
uint64_t uResult = Tmp128.s.Hi >> uQpcInterruptTimeIncrementShift;
/* Add to base interrupt time value. */
uResult += uInterruptTime;
/* Convert from NT unit to nano seconds. */
return uResult * 100;
}
ASMNopPause();
}
}
#endif
/*
* Just read interrupt time.
*/
#if ARCH_BITS >= 64
uint64_t uRet = *(uint64_t volatile *)&pUserSharedData->InterruptTime; /* This is what KeQueryInterruptTime does. */
uRet *= 100;
return uRet;
#else
LARGE_INTEGER NtTime;
do
{
NtTime.HighPart = pUserSharedData->InterruptTime.High1Time;
NtTime.LowPart = pUserSharedData->InterruptTime.LowPart;
} while (pUserSharedData->InterruptTime.High2Time != NtTime.HighPart);
return (uint64_t)NtTime.QuadPart * 100;
#endif
}
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
/*
* Get the precise time if possible.
*/
if (RT_UNLIKELY(!g_fInitialized))
rtTimeNtInitialize();
if (g_pfnRtlGetSystemTimePrecise != NULL)
return RTTimeSpecSetNtTime(pTime, g_pfnRtlGetSystemTimePrecise());
/*
* Just read system time.
*/
KUSER_SHARED_DATA volatile *pUserSharedData = (KUSER_SHARED_DATA volatile *)MM_SHARED_USER_DATA_VA;
#ifdef RT_ARCH_AMD64
uint64_t uRet = *(uint64_t volatile *)&pUserSharedData->SystemTime; /* This is what KeQuerySystemTime does. */
return RTTimeSpecSetNtTime(pTime, uRet);
#else
LARGE_INTEGER NtTime;
do
{
NtTime.HighPart = pUserSharedData->SystemTime.High1Time;
NtTime.LowPart = pUserSharedData->SystemTime.LowPart;
} while (pUserSharedData->SystemTime.High2Time != NtTime.HighPart);
return RTTimeSpecSetNtTime(pTime, NtTime.QuadPart);
#endif
}
RTDECL(PRTTIMESPEC) RTTimeLocalNow(PRTTIMESPEC pTime)
{
return RTTimeSpecAddNano(RTTimeNow(pTime), RTTimeLocalDeltaNano());
}
RTDECL(int64_t) RTTimeLocalDeltaNano(void)
{
/*
* UTC = local + TimeZoneBias; The bias is given in NT units.
*/
KUSER_SHARED_DATA volatile *pUserSharedData = (KUSER_SHARED_DATA volatile *)MM_SHARED_USER_DATA_VA;
LARGE_INTEGER Delta;
#if ARCH_BITS == 64
Delta.QuadPart = *(int64_t volatile *)&pUserSharedData->TimeZoneBias;
#else
do
{
Delta.HighPart = pUserSharedData->TimeZoneBias.High1Time;
Delta.LowPart = pUserSharedData->TimeZoneBias.LowPart;
} while (pUserSharedData->TimeZoneBias.High2Time != Delta.HighPart);
#endif
return Delta.QuadPart * -100;
}
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