1 files changed, 228 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/nt/thread-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/thread-r0drv-nt.cpp
new file mode 100644
index 00000000..a5acd905
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/nt/thread-r0drv-nt.cpp
@@ -0,0 +1,228 @@
+/* $Id: thread-r0drv-nt.cpp $ */
+/** @file
+ * IPRT - Threads, Ring-0 Driver, NT.
+ */
+
+/*
+ * 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                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-nt-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/thread.h>
+
+#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
+# include <iprt/asm-amd64-x86.h>
+#endif
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mp.h>
+#include "internal-r0drv-nt.h"
+
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+    return (RTNATIVETHREAD)PsGetCurrentThread();
+}
+
+
+static int rtR0ThreadNtSleepCommon(RTMSINTERVAL cMillies)
+{
+    LARGE_INTEGER Interval;
+    Interval.QuadPart = -(int64_t)cMillies * 10000;
+    NTSTATUS rcNt = KeDelayExecutionThread(KernelMode, TRUE, &Interval);
+    switch (rcNt)
+    {
+        case STATUS_SUCCESS:
+            return VINF_SUCCESS;
+        case STATUS_ALERTED:
+        case STATUS_USER_APC:
+            return VERR_INTERRUPTED;
+        default:
+            return RTErrConvertFromNtStatus(rcNt);
+    }
+}
+
+
+RTDECL(int)   RTThreadSleep(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadNtSleepCommon(cMillies);
+}
+
+
+RTDECL(bool) RTThreadYield(void)
+{
+    return ZwYieldExecution() != STATUS_NO_YIELD_PERFORMED;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); RT_NOREF1(hThread);
+    KIRQL Irql = KeGetCurrentIrql();
+    if (Irql > APC_LEVEL)
+        return false;
+    if (!ASMIntAreEnabled())
+        return false;
+    return true;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); RT_NOREF1(hThread);
+
+    /*
+     * The KeShouldYieldProcessor API introduced in Windows 10 looks like exactly
+     * what we want.  But of course there is a snag.  It may return with interrupts
+     * enabled when called with them disabled.  Let's just hope it doesn't get upset
+     * by disabled interrupts in other ways...
+     */
+    if (g_pfnrtKeShouldYieldProcessor)
+    {
+        RTCCUINTREG fSavedFlags = ASMGetFlags();
+        bool fReturn = g_pfnrtKeShouldYieldProcessor() != FALSE;
+        ASMSetFlags(fSavedFlags);
+        return fReturn;
+    }
+
+    /*
+     * Fallback approach for pre W10 kernels.
+     *
+     * If W10 is anything to go by, we should also check and yield when:
+     *      - pPrcb->NextThread != NULL && pPrcb->NextThread != pPrcb->CurrentThread
+     *        when QuantumEnd is zero.
+     *      - pPrcb->DpcRequestSummary & 1
+     *      - pPrcb->DpcRequestSummary & 0x1e
+     */
+
+    /*
+     * Read the globals and check if they are useful.
+     */
+/** @todo Should we check KPRCB.InterruptRequest and KPRCB.DpcInterruptRequested (older kernels).  */
+    uint32_t const offQuantumEnd     = g_offrtNtPbQuantumEnd;
+    uint32_t const cbQuantumEnd      = g_cbrtNtPbQuantumEnd;
+    uint32_t const offDpcQueueDepth  = g_offrtNtPbDpcQueueDepth;
+    if (!offQuantumEnd && !cbQuantumEnd && !offDpcQueueDepth)
+        return false;
+    Assert((offQuantumEnd && cbQuantumEnd) || (!offQuantumEnd && !cbQuantumEnd));
+
+    /*
+     * Disable interrupts so we won't be messed around.
+     */
+    bool            fPending;
+    RTCCUINTREG     fSavedFlags  = ASMIntDisableFlags();
+
+#ifdef RT_ARCH_X86
+    PKPCR       pPcr   = (PKPCR)__readfsdword(RT_UOFFSETOF(KPCR,SelfPcr));
+    uint8_t    *pbPrcb = (uint8_t *)pPcr->Prcb;
+
+#elif defined(RT_ARCH_AMD64)
+    /* HACK ALERT! The offset is from windbg/vista64. */
+    PKPCR       pPcr   = (PKPCR)__readgsqword(RT_UOFFSETOF(KPCR,Self));
+    uint8_t    *pbPrcb = (uint8_t *)pPcr->CurrentPrcb;
+
+#else
+# error "port me"
+#endif
+
+    /* Check QuantumEnd. */
+    if (cbQuantumEnd == 1)
+    {
+        uint8_t volatile *pbQuantumEnd = (uint8_t volatile *)(pbPrcb + offQuantumEnd);
+        fPending = *pbQuantumEnd == TRUE;
+    }
+    else if (cbQuantumEnd == sizeof(uint32_t))
+    {
+        uint32_t volatile *pu32QuantumEnd = (uint32_t volatile *)(pbPrcb + offQuantumEnd);
+        fPending = *pu32QuantumEnd != 0;
+    }
+    else
+        fPending = false;
+
+    /* Check DpcQueueDepth. */
+    if (    !fPending
+        &&  offDpcQueueDepth)
+    {
+        uint32_t volatile *pu32DpcQueueDepth = (uint32_t volatile *)(pbPrcb + offDpcQueueDepth);
+        fPending = *pu32DpcQueueDepth > 0;
+    }
+
+    ASMSetFlags(fSavedFlags);
+    return fPending;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
+{
+    if (g_pfnrtKeShouldYieldProcessor)
+        return true;
+#if 0 /** @todo RTThreadPreemptIsPending isn't good enough on w7 and possibly elsewhere. */
+    /* RTThreadPreemptIsPending is only reliable if we've got both offsets and size. */
+    return g_offrtNtPbQuantumEnd    != 0
+        && g_cbrtNtPbQuantumEnd     != 0
+        && g_offrtNtPbDpcQueueDepth != 0;
+#else
+    return false;
+#endif
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPossible(void)
+{
+    /* yes, kernel preemption is possible. */
+    return true;
+}
+
+
+RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+    Assert(pState->uchOldIrql == 255);
+    Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);
+
+    KeRaiseIrql(DISPATCH_LEVEL, &pState->uchOldIrql);
+    RT_ASSERT_PREEMPT_CPUID_DISABLE(pState);
+}
+
+
+RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+
+    RT_ASSERT_PREEMPT_CPUID_RESTORE(pState);
+    KeLowerIrql(pState->uchOldIrql);
+    pState->uchOldIrql = 255;
+}
+
+
+RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
+
+    KIRQL CurIrql = KeGetCurrentIrql();
+    return CurIrql > PASSIVE_LEVEL; /** @todo Is there a more correct way? */
+}
+