| 1 | /* $Id: time-win.cpp 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Time, Windows.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2024 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 <iprt/nt/nt-and-windows.h>
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| 43 |
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| 44 | #include <iprt/time.h>
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| 45 | #include "internal/iprt.h"
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| 46 |
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| 47 | #include <iprt/asm.h>
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| 48 | #include <iprt/assert.h>
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| 49 | #include <iprt/errcore.h>
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| 50 | #include "internal/time.h"
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| 51 | #include "internal-r3-win.h"
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| 52 |
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| 53 | /*
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| 54 | * Note! The selected time source be the exact same one as we use in kernel land!
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| 55 | */
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| 56 | //#define USE_TICK_COUNT
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| 57 | //#define USE_PERFORMANCE_COUNTER
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| 58 | //# define USE_FILE_TIME
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| 59 | //#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
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| 60 | # define USE_INTERRUPT_TIME
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| 61 | //#else
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| 62 | //# define USE_TICK_COUNT
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| 63 | //#endif
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| 64 |
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| 65 |
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| 66 |
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| 67 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 68 | {
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| 69 | #if defined USE_TICK_COUNT
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| 70 | /*
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| 71 | * This would work if it didn't flip over every 49 (or so) days.
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| 72 | */
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| 73 | return (uint64_t)GetTickCount() * RT_NS_1MS_64;
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| 74 |
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| 75 | #elif defined USE_PERFORMANCE_COUNTER
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| 76 | /*
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| 77 | * Slow and not derived from InterruptTime.
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| 78 | */
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| 79 | static LARGE_INTEGER llFreq;
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| 80 | static unsigned uMult;
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| 81 | if (!llFreq.QuadPart)
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| 82 | {
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| 83 | if (!QueryPerformanceFrequency(&llFreq))
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| 84 | return (uint64_t)GetTickCount() * RT_NS_1MS_64;
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| 85 | llFreq.QuadPart /= 1000;
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| 86 | uMult = 1000000; /* no math genius, but this seemed to help avoiding floating point. */
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| 87 | }
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| 88 |
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| 89 | LARGE_INTEGER ll;
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| 90 | if (QueryPerformanceCounter(&ll))
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| 91 | return (ll.QuadPart * uMult) / llFreq.QuadPart;
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| 92 | return (uint64_t)GetTickCount() * RT_NS_1MS_64;
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| 93 |
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| 94 | #elif defined USE_FILE_TIME
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| 95 | /*
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| 96 | * This is SystemTime not InterruptTime.
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| 97 | */
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| 98 | uint64_t u64; /* manual say larger integer, should be safe to assume it's the same. */
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| 99 | GetSystemTimeAsFileTime((LPFILETIME)&u64);
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| 100 | return u64 * 100;
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| 101 |
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| 102 | #elif defined USE_INTERRUPT_TIME
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| 103 | /*
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| 104 | * Use interrupt time if we can (not possible on NT 3.1).
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| 105 | * Note! We cannot entirely depend on g_enmWinVer here as we're likely to
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| 106 | * get called before IPRT is initialized. Ditto g_hModNtDll.
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| 107 | */
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| 108 | static PFNRTLGETINTERRUPTTIMEPRECISE s_pfnRtlGetInterruptTimePrecise = NULL;
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| 109 | static int volatile s_iCanUseUserSharedData = -1;
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| 110 | int iCanUseUserSharedData = s_iCanUseUserSharedData;
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| 111 | if (iCanUseUserSharedData != -1)
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| 112 | { /* likely */ }
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| 113 | else
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| 114 | {
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| 115 | /* We may be called before g_enmWinVer has been initialized. */
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| 116 | if (g_enmWinVer != kRTWinOSType_UNKNOWN)
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| 117 | iCanUseUserSharedData = g_enmWinVer > kRTWinOSType_NT310;
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| 118 | else
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| 119 | {
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| 120 | DWORD dwVer = GetVersion();
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| 121 | iCanUseUserSharedData = (dwVer & 0xff) != 3 || ((dwVer >> 8) & 0xff) >= 50;
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| 122 | }
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| 123 | if (iCanUseUserSharedData != 0)
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| 124 | {
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| 125 | FARPROC pfn = GetProcAddress(g_hModNtDll ? g_hModNtDll : GetModuleHandleW(L"ntdll"), "RtlGetInterruptTimePrecise");
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| 126 | if (pfn != NULL)
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| 127 | {
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| 128 | ASMAtomicWritePtr(&s_pfnRtlGetInterruptTimePrecise, pfn);
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| 129 | iCanUseUserSharedData = 42;
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| 130 | }
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| 131 | }
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| 132 | s_iCanUseUserSharedData = iCanUseUserSharedData;
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| 133 | }
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| 134 |
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| 135 | if (iCanUseUserSharedData != 0)
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| 136 | {
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| 137 | LARGE_INTEGER Time;
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| 138 | if (iCanUseUserSharedData == 42)
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| 139 | {
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| 140 | uint64_t iIgnored;
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| 141 | Time.QuadPart = s_pfnRtlGetInterruptTimePrecise(&iIgnored);
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| 142 | }
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| 143 | else
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| 144 | {
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| 145 | PKUSER_SHARED_DATA pUserSharedData = (PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA;
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| 146 | do
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| 147 | {
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| 148 | Time.HighPart = pUserSharedData->InterruptTime.High1Time;
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| 149 | Time.LowPart = pUserSharedData->InterruptTime.LowPart;
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| 150 | } while (pUserSharedData->InterruptTime.High2Time != Time.HighPart);
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| 151 | }
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| 152 |
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| 153 | return (uint64_t)Time.QuadPart * 100;
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| 154 | }
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| 155 |
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| 156 | return (uint64_t)GetTickCount() * RT_NS_1MS_64;
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| 157 |
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| 158 | #else
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| 159 | # error "Must select a method bright guy!"
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| 160 | #endif
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| 161 | }
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| 162 |
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| 163 |
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| 164 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 165 | {
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| 166 | return rtTimeGetSystemNanoTS();
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| 167 | }
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| 168 |
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| 169 |
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| 170 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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| 171 | {
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| 172 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 173 | }
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| 174 |
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| 175 |
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| 176 | RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
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| 177 | {
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| 178 | uint64_t u64;
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| 179 | AssertCompile(sizeof(u64) == sizeof(FILETIME));
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| 180 | if (g_pfnGetSystemTimeAsFileTime)
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| 181 | g_pfnGetSystemTimeAsFileTime((LPFILETIME)&u64);
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| 182 | else
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| 183 | {
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| 184 | SYSTEMTIME SysTime = {0};
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| 185 | GetSystemTime(&SysTime);
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| 186 | BOOL fRet = SystemTimeToFileTime(&SysTime, (LPFILETIME)&u64);
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| 187 | Assert(fRet); RT_NOREF(fRet);
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| 188 | }
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| 189 | return RTTimeSpecSetNtTime(pTime, u64);
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| 190 |
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| 191 | }
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| 192 |
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| 193 |
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| 194 | RTDECL(PRTTIMESPEC) RTTimeLocalNow(PRTTIMESPEC pTime)
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| 195 | {
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| 196 | uint64_t u64Local;
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| 197 | if (g_pfnGetSystemTimeAsFileTime)
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| 198 | {
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| 199 | uint64_t u64;
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| 200 | AssertCompile(sizeof(u64) == sizeof(FILETIME));
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| 201 | g_pfnGetSystemTimeAsFileTime((LPFILETIME)&u64);
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| 202 | if (!FileTimeToLocalFileTime((FILETIME const *)&u64, (LPFILETIME)&u64Local))
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| 203 | u64Local = u64;
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| 204 | }
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| 205 | else
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| 206 | {
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| 207 | SYSTEMTIME SysTime = {0};
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| 208 | GetLocalTime(&SysTime);
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| 209 | BOOL fRet = SystemTimeToFileTime(&SysTime, (LPFILETIME)&u64Local);
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| 210 | Assert(fRet); RT_NOREF(fRet);
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| 211 | }
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| 212 | return RTTimeSpecSetNtTime(pTime, u64Local);
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| 213 | }
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| 214 |
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| 215 |
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| 216 | RTDECL(int64_t) RTTimeLocalDeltaNano(void)
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| 217 | {
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| 218 | /*
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| 219 | * UTC = local + Tzi.Bias;
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| 220 | * The bias is given in minutes.
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| 221 | */
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| 222 | TIME_ZONE_INFORMATION Tzi;
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| 223 | Tzi.Bias = 0;
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| 224 | if (GetTimeZoneInformation(&Tzi) != TIME_ZONE_ID_INVALID)
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| 225 | return -(int64_t)Tzi.Bias * 60 * RT_NS_1SEC_64;
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| 226 | return 0;
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| 227 | }
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| 228 |
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