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, 197 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/nt/spinlock-r0drv-nt.cpp b/src/VBox/Runtime/r0drv/nt/spinlock-r0drv-nt.cpp
new file mode 100644
index 00000000..75ce49bc
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/nt/spinlock-r0drv-nt.cpp
@@ -0,0 +1,197 @@
+/* $Id: spinlock-r0drv-nt.cpp $ */
+/** @file
+ * IPRT - Spinlocks, 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 <iprt/spinlock.h>
+
+#include <iprt/asm.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/mem.h>
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** Apply the NoIrq hack if defined. */
+#define RTSPINLOCK_NT_HACK_NOIRQ
+
+#ifdef RTSPINLOCK_NT_HACK_NOIRQ
+/** Indicates that the spinlock is taken. */
+# define RTSPINLOCK_NT_HACK_NOIRQ_TAKEN  UINT32(0x00c0ffee)
+/** Indicates that the spinlock is taken. */
+# define RTSPINLOCK_NT_HACK_NOIRQ_FREE   UINT32(0xfe0000fe)
+#endif
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the KSPIN_LOCK type.
+ */
+typedef struct RTSPINLOCKINTERNAL
+{
+    /** Spinlock magic value (RTSPINLOCK_MAGIC). */
+    uint32_t volatile   u32Magic;
+#ifdef RTSPINLOCK_NT_HACK_NOIRQ
+    /** Spinlock hack. */
+    uint32_t volatile   u32Hack;
+#endif
+    /** The saved IRQL. */
+    KIRQL volatile      SavedIrql;
+    /** The saved interrupt flag. */
+    RTCCUINTREG volatile fIntSaved;
+    /** The spinlock creation flags. */
+    uint32_t            fFlags;
+    /** The NT spinlock structure. */
+    KSPIN_LOCK          Spinlock;
+} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
+
+
+RTDECL(int)  RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
+{
+    AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
+    RT_NOREF1(pszName);
+
+    /*
+     * Allocate.
+     */
+    Assert(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAlloc(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    /*
+     * Initialize & return.
+     */
+    pThis->u32Magic     = RTSPINLOCK_MAGIC;
+#ifdef RTSPINLOCK_NT_HACK_NOIRQ
+    pThis->u32Hack      = RTSPINLOCK_NT_HACK_NOIRQ_FREE;
+#endif
+    pThis->SavedIrql    = 0;
+    pThis->fIntSaved    = 0;
+    pThis->fFlags       = fFlags;
+    KeInitializeSpinLock(&pThis->Spinlock);
+
+    *pSpinlock = pThis;
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSpinlockDestroy(RTSPINLOCK Spinlock)
+{
+    /*
+     * Validate input.
+     */
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    if (pThis->u32Magic != RTSPINLOCK_MAGIC)
+    {
+        AssertMsgFailed(("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    ASMAtomicIncU32(&pThis->u32Magic);
+    RTMemFree(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_MAGIC, ("magic=%#x\n", pThis->u32Magic));
+
+    KIRQL SavedIrql;
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+#ifndef RTSPINLOCK_NT_HACK_NOIRQ
+        RTCCUINTREG fIntSaved = ASMGetFlags();
+        ASMIntDisable();
+        KeAcquireSpinLock(&pThis->Spinlock, &SavedIrql);
+#else
+        SavedIrql = KeGetCurrentIrql();
+        if (SavedIrql < DISPATCH_LEVEL)
+        {
+            KeRaiseIrql(DISPATCH_LEVEL, &SavedIrql);
+            Assert(SavedIrql < DISPATCH_LEVEL);
+        }
+        RTCCUINTREG fIntSaved = ASMGetFlags();
+        ASMIntDisable();
+
+        if (!ASMAtomicCmpXchgU32(&pThis->u32Hack, RTSPINLOCK_NT_HACK_NOIRQ_TAKEN, RTSPINLOCK_NT_HACK_NOIRQ_FREE))
+        {
+            while (!ASMAtomicCmpXchgU32(&pThis->u32Hack, RTSPINLOCK_NT_HACK_NOIRQ_TAKEN, RTSPINLOCK_NT_HACK_NOIRQ_FREE))
+                ASMNopPause();
+        }
+#endif
+        pThis->fIntSaved = fIntSaved;
+    }
+    else
+        KeAcquireSpinLock(&pThis->Spinlock, &SavedIrql);
+    pThis->SavedIrql = SavedIrql;
+}
+
+
+RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    AssertMsg(pThis && pThis->u32Magic == RTSPINLOCK_MAGIC, ("magic=%#x\n", pThis->u32Magic));
+
+    KIRQL SavedIrql = pThis->SavedIrql;
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE)
+    {
+        RTCCUINTREG fIntSaved = pThis->fIntSaved;
+        pThis->fIntSaved = 0;
+
+#ifndef RTSPINLOCK_NT_HACK_NOIRQ
+        KeReleaseSpinLock(&pThis->Spinlock, SavedIrql);
+        ASMSetFlags(fIntSaved);
+#else
+        Assert(pThis->u32Hack == RTSPINLOCK_NT_HACK_NOIRQ_TAKEN);
+
+        ASMAtomicWriteU32(&pThis->u32Hack, RTSPINLOCK_NT_HACK_NOIRQ_FREE);
+        ASMSetFlags(fIntSaved);
+        if (SavedIrql < DISPATCH_LEVEL)
+            KeLowerIrql(SavedIrql);
+#endif
+    }
+    else
+        KeReleaseSpinLock(&pThis->Spinlock, SavedIrql);
+}
+