1 | /* $Id: time-win.cpp 98103 2023-01-17 14:15:46Z 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) 2006-2023 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 <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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