Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 218 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/nt/time-nt.cpp b/src/VBox/Runtime/r3/nt/time-nt.cpp
new file mode 100644
index 00000000..1487a4dc
--- /dev/null
+++ b/src/VBox/Runtime/r3/nt/time-nt.cpp
@@ -0,0 +1,218 @@
+/* $Id: time-nt.cpp $ */
+/** @file
+ * IPRT - Time, Windows.
+ */
+
+/*
+ * Copyright (C) 2006-2019 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 "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;
+}
+