| 1 | /* $Id: time-r0drv-nt.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Time, Ring-0 Driver, Nt.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #define LOG_GROUP RTLOGGROUP_TIME
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| 42 | #include "the-nt-kernel.h"
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| 43 | #include "internal-r0drv-nt.h"
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| 44 | #include <iprt/time.h>
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| 45 |
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| 46 |
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| 47 | /*
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| 48 | * The KeQueryTickCount macro isn't compatible with NT 3.1, use the
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| 49 | * exported KPI instead.
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| 50 | */
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| 51 | #ifdef RT_ARCH_X86
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| 52 | # undef KeQueryTickCount
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| 53 | extern "C" NTKERNELAPI void NTAPI KeQueryTickCount(PLARGE_INTEGER);
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| 54 | #endif
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| 55 |
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| 56 |
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| 57 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 58 | {
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| 59 | /*
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| 60 | * Note! The time source we use here must be exactly the same as in
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| 61 | * the ring-3 code!
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| 62 | *
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| 63 | * Using interrupt time is the simplest and requires the least calculation.
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| 64 | * It is also accounting for suspended time. Unfortuantely, there is no
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| 65 | * ring-3 for reading it... but that won't stop us.
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| 66 | *
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| 67 | * Using the tick count is problematic in ring-3 on older windows version
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| 68 | * as we can only get the 32-bit tick value, i.e. we'll roll over sooner or
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| 69 | * later.
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| 70 | */
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| 71 | #if 1
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| 72 | /* Interrupt time. */
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| 73 | LARGE_INTEGER InterruptTime;
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| 74 | if (g_pfnrtKeQueryInterruptTimePrecise)
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| 75 | {
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| 76 | ULONG64 QpcTsIgnored;
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| 77 | InterruptTime.QuadPart = g_pfnrtKeQueryInterruptTimePrecise(&QpcTsIgnored);
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| 78 | }
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| 79 | # ifdef RT_ARCH_X86
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| 80 | else if (g_pfnrtKeQueryInterruptTime) /* W2K+ */
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| 81 | InterruptTime.QuadPart = g_pfnrtKeQueryInterruptTime();
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| 82 | else if (g_uRtNtVersion >= RTNT_MAKE_VERSION(3, 50))
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| 83 | {
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| 84 | /* NT 3.50 and later, also pre-init: Use the user shared data. */
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| 85 | do
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| 86 | {
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| 87 | InterruptTime.HighPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High1Time;
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| 88 | InterruptTime.LowPart = ((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.LowPart;
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| 89 | } while (((KUSER_SHARED_DATA volatile *)SharedUserData)->InterruptTime.High2Time != InterruptTime.HighPart);
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| 90 | }
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| 91 | else
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| 92 | {
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| 93 | /*
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| 94 | * There is no KUSER_SHARED_DATA structure on NT 3.1, so we have no choice
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| 95 | * but to use the tick count. We must also avoid the KeQueryTickCount macro
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| 96 | * in the WDK, since NT 3.1 doesn't have the KeTickCount data export either (see above).
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| 97 | */
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| 98 | static ULONG volatile s_uTimeIncrement = 0;
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| 99 | ULONG uTimeIncrement = s_uTimeIncrement;
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| 100 | if (!uTimeIncrement)
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| 101 | {
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| 102 | uTimeIncrement = KeQueryTimeIncrement();
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| 103 | Assert(uTimeIncrement != 0);
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| 104 | Assert(uTimeIncrement * 100 / 100 == uTimeIncrement);
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| 105 | uTimeIncrement *= 100;
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| 106 | s_uTimeIncrement = uTimeIncrement;
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| 107 | }
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| 108 |
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| 109 | KeQueryTickCount(&InterruptTime);
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| 110 | return (uint64_t)InterruptTime.QuadPart * uTimeIncrement;
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| 111 | }
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| 112 | # else
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| 113 | else
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| 114 | InterruptTime.QuadPart = KeQueryInterruptTime(); /* Macro on AMD64. */
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| 115 | # endif
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| 116 | return (uint64_t)InterruptTime.QuadPart * 100;
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| 117 | #else
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| 118 | /* Tick count. Works all the way back to NT 3.1 with #undef above. */
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| 119 | LARGE_INTEGER Tick;
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| 120 | KeQueryTickCount(&Tick);
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| 121 | return (uint64_t)Tick.QuadPart * KeQueryTimeIncrement() * 100;
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| 122 | #endif
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| 123 | }
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| 124 |
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| 125 |
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| 126 | RTDECL(uint64_t) RTTimeNanoTS(void)
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| 127 | {
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| 128 | return rtTimeGetSystemNanoTS();
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| 129 | }
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| 130 |
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| 131 |
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| 132 | RTDECL(uint64_t) RTTimeMilliTS(void)
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| 133 | {
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| 134 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 135 | }
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| 136 |
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| 137 |
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| 138 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 139 | {
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| 140 | return rtTimeGetSystemNanoTS();
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| 141 | }
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| 142 |
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| 143 |
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| 144 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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| 145 | {
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| 146 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 147 | }
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| 148 |
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| 149 |
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| 150 | RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
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| 151 | {
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| 152 | LARGE_INTEGER SystemTime;
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| 153 | if (g_pfnrtKeQuerySystemTimePrecise)
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| 154 | g_pfnrtKeQuerySystemTimePrecise(&SystemTime);
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| 155 | else
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| 156 | KeQuerySystemTime(&SystemTime); /* Macro on AMD64, export on X86. */
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| 157 | return RTTimeSpecSetNtTime(pTime, SystemTime.QuadPart);
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| 158 | }
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| 159 |
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