Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

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

19 files changed, 3298 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r0drv/netbsd/Makefile.kup b/src/VBox/Runtime/r0drv/netbsd/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/Makefile.kup
diff --git a/src/VBox/Runtime/r0drv/netbsd/RTLogWriteStdOut-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/RTLogWriteStdOut-r0drv-netbsd.c
new file mode 100644
index 00000000..8f37516b
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/RTLogWriteStdOut-r0drv-netbsd.c
@@ -0,0 +1,49 @@
+/* $Id: RTLogWriteStdOut-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Log To StdOut, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/log.h>
+
+
+RTDECL(void) RTLogWriteStdOut(const char *pch, size_t cb)
+{
+    printf("%.*s", (int)cb, pch);
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/alloc-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/alloc-r0drv-netbsd.c
new file mode 100644
index 00000000..1c245576
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/alloc-r0drv-netbsd.c
@@ -0,0 +1,176 @@
+/* $Id: alloc-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Memory Allocation, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2014-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * ---------------------------------------------------------------------------
+ *
+ * This code is based on:
+ *
+ * Copyright (c) 2014 Arto Huusko
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/mem.h>
+
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/param.h>
+
+#include "r0drv/alloc-r0drv.h"
+
+
+DECLHIDDEN(int) rtR0MemAllocEx(size_t cb, uint32_t fFlags, PRTMEMHDR *ppHdr)
+{
+    size_t      cbAllocated = cb;
+    PRTMEMHDR   pHdr        = NULL;
+
+    if (fFlags & RTMEMHDR_FLAG_ZEROED)
+        pHdr = kmem_zalloc(cb + sizeof(RTMEMHDR), KM_NOSLEEP);
+    else
+        pHdr = kmem_alloc(cb + sizeof(RTMEMHDR), KM_NOSLEEP);
+
+    if (RT_UNLIKELY(!pHdr))
+        return VERR_NO_MEMORY;
+
+    pHdr->u32Magic   = RTMEMHDR_MAGIC;
+    pHdr->fFlags     = fFlags;
+    pHdr->cb         = cbAllocated;
+    pHdr->cbReq      = cb;
+
+    *ppHdr = pHdr;
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(void) rtR0MemFree(PRTMEMHDR pHdr)
+{
+    pHdr->u32Magic += 1;
+
+    kmem_free(pHdr, pHdr->cb + sizeof(RTMEMHDR));
+}
+
+RTR0DECL(void) RTMemContFree(void *pv, size_t cb)
+{
+    if (pv)
+    {
+        cb = round_page(cb);
+
+        paddr_t pa;
+        pmap_extract(pmap_kernel(), (vaddr_t)pv, &pa);
+
+        /*
+         * Reconstruct pglist to free the physical pages
+         */
+        struct pglist rlist;
+        TAILQ_INIT(&rlist);
+
+        for (paddr_t pa2 = pa ; pa2 < pa + cb ; pa2 += PAGE_SIZE) {
+            struct vm_page *page = PHYS_TO_VM_PAGE(pa2);
+            TAILQ_INSERT_TAIL(&rlist, page, pageq.queue);
+        }
+
+        /* Unmap */
+        pmap_kremove((vaddr_t)pv, cb);
+
+        /* Free the virtual space */
+        uvm_km_free(kernel_map, (vaddr_t)pv, cb, UVM_KMF_VAONLY);
+
+        /* Free the physical pages */
+        uvm_pglistfree(&rlist);
+    }
+}
+
+RTR0DECL(void *) RTMemContAlloc(PRTCCPHYS pPhys, size_t cb)
+{
+    /*
+     * Validate input.
+     */
+    AssertPtr(pPhys);
+    Assert(cb > 0);
+
+    cb = round_page(cb);
+
+    vaddr_t virt = uvm_km_alloc(kernel_map, cb, 0,
+            UVM_KMF_VAONLY | UVM_KMF_WAITVA | UVM_KMF_CANFAIL);
+    if (virt == 0)
+        return NULL;
+
+    struct pglist rlist;
+
+    if (uvm_pglistalloc(cb, 0, (paddr_t)0xFFFFFFFF,
+            PAGE_SIZE, 0, &rlist, 1, 1) != 0)
+    {
+        uvm_km_free(kernel_map, virt, cb, UVM_KMF_VAONLY);
+        return NULL;
+    }
+
+    struct vm_page *page;
+    vaddr_t virt2 = virt;
+    TAILQ_FOREACH(page, &rlist, pageq.queue)
+    {
+        pmap_kenter_pa(virt2, VM_PAGE_TO_PHYS(page),
+                VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE, 0);
+        virt2 += PAGE_SIZE;
+    }
+
+    page = TAILQ_FIRST(&rlist);
+    *pPhys = VM_PAGE_TO_PHYS(page);
+
+    return (void *)virt;
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/assert-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/assert-r0drv-netbsd.c
new file mode 100644
index 00000000..b8808ffb
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/assert-r0drv-netbsd.c
@@ -0,0 +1,95 @@
+/* $Id: assert-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Assertion Workers, Ring-0 Drivers, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/assert.h>
+#include <iprt/log.h>
+#include <iprt/stdarg.h>
+
+#include "internal/assert.h"
+
+
+DECLHIDDEN(void) rtR0AssertNativeMsg1(const char *pszExpr, unsigned uLine, const char *pszFile, const char *pszFunction)
+{
+    printf("\r\n!!Assertion Failed!!\r\n"
+           "Expression: %s\r\n"
+           "Location  : %s(%d) %s\r\n",
+           pszExpr, pszFile, uLine, pszFunction);
+}
+
+
+DECLHIDDEN(void) rtR0AssertNativeMsg2V(bool fInitial, const char *pszFormat, va_list va)
+{
+    /** @todo implement rtR0AssertNativeMsg2V. */
+}
+
+
+RTR0DECL(void) RTR0AssertPanicSystem(void)
+{
+    panic("%s%s", g_szRTAssertMsg1, g_szRTAssertMsg2);
+
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/initterm-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/initterm-r0drv-netbsd.c
new file mode 100644
index 00000000..b00ff46c
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/initterm-r0drv-netbsd.c
@@ -0,0 +1,84 @@
+/* $Id: initterm-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Initialization & Termination, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/errcore.h>
+
+#include "internal/initterm.h"
+
+
+DECLHIDDEN(int) rtR0InitNative(void)
+{
+    /* nothing to do */
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(void) rtR0TermNative(void)
+{
+    /* nothing to undo */
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/memobj-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/memobj-r0drv-netbsd.c
new file mode 100644
index 00000000..b77e2854
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/memobj-r0drv-netbsd.c
@@ -0,0 +1,586 @@
+/* $Id: memobj-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Ring-0 Memory Objects, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen, Andriy Gapon, Arto Huusko.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ * Copyright (c) 2011 Andriy Gapon <avg@FreeBSD.org>
+ * Copyright (c) 2014 Arto Huusko
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/memobj.h>
+#include <iprt/mem.h>
+#include <iprt/err.h>
+#include <iprt/assert.h>
+#include <iprt/log.h>
+#include <iprt/param.h>
+#include <iprt/process.h>
+#include "internal/memobj.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * The NetBSD version of the memory object structure.
+ */
+typedef struct RTR0MEMOBJNETBSD
+{
+    /** The core structure. */
+    RTR0MEMOBJINTERNAL  Core;
+    size_t              size;
+    struct pglist       pglist;
+} RTR0MEMOBJNETBSD, *PRTR0MEMOBJNETBSD;
+
+
+typedef struct vm_map* vm_map_t;
+
+/**
+ * Gets the virtual memory map the specified object is mapped into.
+ *
+ * @returns VM map handle on success, NULL if no map.
+ * @param   pMem                The memory object.
+ */
+static vm_map_t rtR0MemObjNetBSDGetMap(PRTR0MEMOBJINTERNAL pMem)
+{
+    switch (pMem->enmType)
+    {
+        case RTR0MEMOBJTYPE_PAGE:
+        case RTR0MEMOBJTYPE_LOW:
+        case RTR0MEMOBJTYPE_CONT:
+            return kernel_map;
+
+        case RTR0MEMOBJTYPE_PHYS:
+        case RTR0MEMOBJTYPE_PHYS_NC:
+            return NULL; /* pretend these have no mapping atm. */
+
+        case RTR0MEMOBJTYPE_LOCK:
+            return pMem->u.Lock.R0Process == NIL_RTR0PROCESS
+                ? kernel_map
+                : &((struct proc *)pMem->u.Lock.R0Process)->p_vmspace->vm_map;
+
+        case RTR0MEMOBJTYPE_RES_VIRT:
+            return pMem->u.ResVirt.R0Process == NIL_RTR0PROCESS
+                ? kernel_map
+                : &((struct proc *)pMem->u.ResVirt.R0Process)->p_vmspace->vm_map;
+
+        case RTR0MEMOBJTYPE_MAPPING:
+            return pMem->u.Mapping.R0Process == NIL_RTR0PROCESS
+                ? kernel_map
+                : &((struct proc *)pMem->u.Mapping.R0Process)->p_vmspace->vm_map;
+
+        default:
+            return NULL;
+    }
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeFree(RTR0MEMOBJ pMem)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)pMem;
+    int rc;
+
+    switch (pMemNetBSD->Core.enmType)
+    {
+        case RTR0MEMOBJTYPE_PAGE:
+        {
+            kmem_free(pMemNetBSD->Core.pv, pMemNetBSD->Core.cb);
+            break;
+        }
+        case RTR0MEMOBJTYPE_LOW:
+        case RTR0MEMOBJTYPE_CONT:
+        {
+            /* Unmap */
+            pmap_kremove((vaddr_t)pMemNetBSD->Core.pv, pMemNetBSD->Core.cb);
+            /* Free the virtual space */
+            uvm_km_free(kernel_map, (vaddr_t)pMemNetBSD->Core.pv, pMemNetBSD->Core.cb, UVM_KMF_VAONLY);
+            /* Free the physical pages */
+            uvm_pglistfree(&pMemNetBSD->pglist);
+            break;
+        }
+        case RTR0MEMOBJTYPE_PHYS:
+        case RTR0MEMOBJTYPE_PHYS_NC:
+        {
+            /* Free the physical pages */
+            uvm_pglistfree(&pMemNetBSD->pglist);
+            break;
+        }
+        case RTR0MEMOBJTYPE_LOCK:
+            if (pMemNetBSD->Core.u.Lock.R0Process != NIL_RTR0PROCESS)
+            {
+                uvm_map_pageable(
+                        &((struct proc *)pMemNetBSD->Core.u.Lock.R0Process)->p_vmspace->vm_map,
+                        (vaddr_t)pMemNetBSD->Core.pv,
+                        ((vaddr_t)pMemNetBSD->Core.pv) + pMemNetBSD->Core.cb,
+                        1, 0);
+            }
+            break;
+        case RTR0MEMOBJTYPE_RES_VIRT:
+            if (pMemNetBSD->Core.u.Lock.R0Process == NIL_RTR0PROCESS)
+            {
+                uvm_km_free(kernel_map, (vaddr_t)pMemNetBSD->Core.pv, pMemNetBSD->Core.cb, UVM_KMF_VAONLY);
+            }
+            break;
+        case RTR0MEMOBJTYPE_MAPPING:
+            if (pMemNetBSD->Core.u.Lock.R0Process == NIL_RTR0PROCESS)
+            {
+                pmap_kremove((vaddr_t)pMemNetBSD->Core.pv, pMemNetBSD->Core.cb);
+                uvm_km_free(kernel_map, (vaddr_t)pMemNetBSD->Core.pv, pMemNetBSD->Core.cb, UVM_KMF_VAONLY);
+            }
+            break;
+
+        default:
+            AssertMsgFailed(("enmType=%d\n", pMemNetBSD->Core.enmType));
+            return VERR_INTERNAL_ERROR;
+    }
+
+    return VINF_SUCCESS;
+}
+
+static int rtR0MemObjNetBSDAllocHelper(PRTR0MEMOBJNETBSD pMemNetBSD, size_t cb, bool fExecutable,
+                                       paddr_t VmPhysAddrHigh, bool fContiguous)
+{
+    /* Virtual space first */
+    vaddr_t virt = uvm_km_alloc(kernel_map, cb, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA | UVM_KMF_CANFAIL);
+    if (virt == 0)
+        return VERR_NO_MEMORY;
+
+    struct pglist *rlist = &pMemNetBSD->pglist;
+
+    int nsegs = fContiguous ? 1 : INT_MAX;
+
+    /* Physical pages */
+    if (uvm_pglistalloc(cb, 0, VmPhysAddrHigh, PAGE_SIZE, 0, rlist, nsegs, 1) != 0)
+    {
+        uvm_km_free(kernel_map, virt, cb, UVM_KMF_VAONLY);
+        return VERR_NO_MEMORY; /** @todo inaccurate status code */
+    }
+
+    /* Map */
+    struct vm_page *page;
+    vm_prot_t prot = VM_PROT_READ | VM_PROT_WRITE;
+    if (fExecutable)
+        prot |= VM_PROT_EXECUTE;
+    vaddr_t virt2 = virt;
+    TAILQ_FOREACH(page, rlist, pageq.queue)
+    {
+        pmap_kenter_pa(virt2, VM_PAGE_TO_PHYS(page), prot, 0);
+        virt2 += PAGE_SIZE;
+    }
+
+    pMemNetBSD->Core.fFlags |= RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC; /*?*/
+    pMemNetBSD->Core.pv = (void *)virt;
+    if (fContiguous)
+    {
+        page = TAILQ_FIRST(rlist);
+        pMemNetBSD->Core.u.Cont.Phys = VM_PAGE_TO_PHYS(page);
+    }
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocPage(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable, const char *pszTag)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_PAGE, NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        void *pvMem = kmem_alloc(cb, KM_SLEEP);
+        if (pvMem)
+        {
+            if (fExecutable)
+                pmap_protect(pmap_kernel(), (vaddr_t)pvMem, (vaddr_t)pvMem + cb, VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE);
+
+            pMemNetBSD->Core.fFlags |= RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC;
+            pMemNetBSD->Core.pv      = pvMem;
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return VERR_NO_PAGE_MEMORY;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocLarge(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, size_t cbLargePage, uint32_t fFlags,
+                                           const char *pszTag)
+{
+    return rtR0MemObjFallbackAllocLarge(ppMem, cb, cbLargePage, fFlags, pszTag);
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocLow(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable, const char *pszTag)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_LOW, NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        int rc = rtR0MemObjNetBSDAllocHelper(pMemNetBSD, cb, fExecutable, _4G - 1, false /*fContiguous*/);
+        if (RT_SUCCESS(rc))
+        {
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return rc;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocCont(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, bool fExecutable, const char *pszTag)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_CONT, NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        int rc = rtR0MemObjNetBSDAllocHelper(pMemNetBSD, cb, fExecutable, _4G - 1, true /*fContiguous*/);
+        if (RT_SUCCESS(rc))
+        {
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return rc;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+static int rtR0MemObjNetBSDAllocPhysPages(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJTYPE enmType, size_t cb,
+                                          RTHCPHYS PhysHighest, size_t uAlignment, bool fContiguous, const char *pszTag)
+{
+    /* create the object. */
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), enmType, NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        paddr_t const VmPhysAddrHigh = PhysHighest != NIL_RTHCPHYS ? PhysHighest : ~(paddr_t)0;
+        int const     nsegs          = fContiguous ? 1 : INT_MAX;
+        int rc = uvm_pglistalloc(cb, 0, VmPhysAddrHigh, uAlignment, 0, &pMemNetBSD->pglist, nsegs, 1);
+        if (!rc)
+        {
+            pMemNetBSD->Core.fFlags |= RTR0MEMOBJ_FLAGS_UNINITIALIZED_AT_ALLOC; /*?*/
+            if (fContiguous)
+            {
+                Assert(enmType == RTR0MEMOBJTYPE_PHYS);
+                const struct vm_page * const pg = TAILQ_FIRST(&pMemNetBSD->pglist);
+                pMemNetBSD->Core.u.Phys.PhysBase = VM_PAGE_TO_PHYS(pg);
+                pMemNetBSD->Core.u.Phys.fAllocated = true;
+            }
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return VERR_NO_PAGE_MEMORY;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocPhys(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, size_t uAlignment,
+                                          const char *pszTag)
+{
+    return rtR0MemObjNetBSDAllocPhysPages(ppMem, RTR0MEMOBJTYPE_PHYS, cb, PhysHighest, uAlignment, true, pszTag);
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeAllocPhysNC(PPRTR0MEMOBJINTERNAL ppMem, size_t cb, RTHCPHYS PhysHighest, const char *pszTag)
+{
+    return rtR0MemObjNetBSDAllocPhysPages(ppMem, RTR0MEMOBJTYPE_PHYS_NC, cb, PhysHighest, PAGE_SIZE, false, pszTag);
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeEnterPhys(PPRTR0MEMOBJINTERNAL ppMem, RTHCPHYS Phys, size_t cb, uint32_t uCachePolicy,
+                                          const char *pszTag)
+{
+    AssertReturn(uCachePolicy == RTMEM_CACHE_POLICY_DONT_CARE, VERR_NOT_SUPPORTED);
+
+    /* create the object. */
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_PHYS, NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        /* there is no allocation here, it needs to be mapped somewhere first. */
+        pMemNetBSD->Core.u.Phys.fAllocated = false;
+        pMemNetBSD->Core.u.Phys.PhysBase = Phys;
+        pMemNetBSD->Core.u.Phys.uCachePolicy = uCachePolicy;
+        TAILQ_INIT(&pMemNetBSD->pglist);
+        *ppMem = &pMemNetBSD->Core;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeLockUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3Ptr, size_t cb, uint32_t fAccess,
+                                         RTR0PROCESS R0Process, const char *pszTag)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_LOCK,
+                                                                    (void *)R3Ptr, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        int rc = uvm_map_pageable(&((struct proc *)R0Process)->p_vmspace->vm_map, R3Ptr, R3Ptr + cb,
+                                  0 /*new_pageable*/, 0 /*lockflags*/);
+        if (!rc)
+        {
+            pMemNetBSD->Core.u.Lock.R0Process = R0Process;
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return VERR_LOCK_FAILED;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeLockKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pv, size_t cb, uint32_t fAccess, const char *pszTag)
+{
+    /* Kernel memory (always?) wired; all memory allocated by vbox code is? */
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_LOCK, pv, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        pMemNetBSD->Core.u.Lock.R0Process = NIL_RTR0PROCESS;
+        pMemNetBSD->Core.pv = pv;
+        *ppMem = &pMemNetBSD->Core;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+DECLHIDDEN(int) rtR0MemObjNativeReserveKernel(PPRTR0MEMOBJINTERNAL ppMem, void *pvFixed, size_t cb, size_t uAlignment,
+                                              const char *pszTag)
+{
+    if (pvFixed != (void *)-1)
+    {
+        /* can we support this? or can we assume the virtual space is already reserved? */
+        printf("reserve specified kernel virtual address not supported\n");
+        return VERR_NOT_SUPPORTED;
+    }
+
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_RES_VIRT,
+                                                                    NULL, cb, pszTag);
+    if (pMemNetBSD)
+    {
+        vaddr_t virt = uvm_km_alloc(kernel_map, cb, uAlignment, UVM_KMF_VAONLY | UVM_KMF_WAITVA | UVM_KMF_CANFAIL);
+        if (virt != 0)
+        {
+            pMemNetBSD->Core.u.ResVirt.R0Process = NIL_RTR0PROCESS;
+            pMemNetBSD->Core.pv = (void *)virt;
+            *ppMem = &pMemNetBSD->Core;
+            return VINF_SUCCESS;
+        }
+        rtR0MemObjDelete(&pMemNetBSD->Core);
+        return VERR_NO_MEMORY;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeReserveUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR R3PtrFixed, size_t cb, size_t uAlignment,
+                                            RTR0PROCESS R0Process, const char *pszTag)
+{
+    RT_NOREF(ppMem, R3PtrFixed, cb, uAlignment, R0Process, pszTag);
+    printf("NativeReserveUser\n");
+    return VERR_NOT_SUPPORTED;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, void *pvFixed, size_t uAlignment,
+                                          unsigned fProt, size_t offSub, size_t cbSub, const char *pszTag)
+{
+    if (pvFixed != (void *)-1)
+    {
+        /* can we support this? or can we assume the virtual space is already reserved? */
+        printf("map to specified kernel virtual address not supported\n");
+        return VERR_NOT_SUPPORTED;
+    }
+
+    PRTR0MEMOBJNETBSD pMemNetBSD0 = (PRTR0MEMOBJNETBSD)pMemToMap;
+    if ((pMemNetBSD0->Core.enmType != RTR0MEMOBJTYPE_PHYS)
+        && (pMemNetBSD0->Core.enmType != RTR0MEMOBJTYPE_PHYS_NC))
+    {
+        printf("memory to map is not physical\n");
+        return VERR_NOT_SUPPORTED;
+    }
+    size_t sz = cbSub > 0 ? cbSub : pMemNetBSD0->Core.cb;
+
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)rtR0MemObjNew(sizeof(*pMemNetBSD), RTR0MEMOBJTYPE_MAPPING, NULL, sz, pszTag);
+
+    vaddr_t virt = uvm_km_alloc(kernel_map, sz, uAlignment, UVM_KMF_VAONLY | UVM_KMF_WAITVA | UVM_KMF_CANFAIL);
+    if (virt != 0)
+    {
+        vm_prot_t prot = 0;
+        if (fProt & RTMEM_PROT_READ)
+            prot |= VM_PROT_READ;
+        if (fProt & RTMEM_PROT_WRITE)
+            prot |= VM_PROT_WRITE;
+        if (fProt & RTMEM_PROT_EXEC)
+            prot |= VM_PROT_EXECUTE;
+
+        struct vm_page *page;
+        vaddr_t virt2 = virt;
+        size_t map_pos = 0;
+        TAILQ_FOREACH(page, &pMemNetBSD0->pglist, pageq.queue)
+        {
+            if (map_pos >= offSub)
+            {
+                if (cbSub > 0 && (map_pos >= offSub + cbSub))
+                    break;
+
+                pmap_kenter_pa(virt2, VM_PAGE_TO_PHYS(page), prot, 0);
+                virt2 += PAGE_SIZE;
+            }
+            map_pos += PAGE_SIZE;
+        }
+
+        pMemNetBSD->Core.pv = (void *)virt;
+        pMemNetBSD->Core.u.Mapping.R0Process = NIL_RTR0PROCESS;
+        *ppMem = &pMemNetBSD->Core;
+        return VINF_SUCCESS;
+    }
+
+    rtR0MemObjDelete(&pMemNetBSD->Core);
+    return VERR_NO_MEMORY;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeMapUser(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, RTR3PTR R3PtrFixed, size_t uAlignment,
+                                        unsigned fProt, RTR0PROCESS R0Process, size_t offSub, size_t cbSub, const char *pszTag)
+{
+    RT_NOREF(ppMem, pMemToMap, R3PtrFixed, uAlignment, fProt, R0Process, offSub, cbSub, pszTag);
+    printf("NativeMapUser\n");
+    return VERR_NOT_SUPPORTED;
+}
+
+
+DECLHIDDEN(int) rtR0MemObjNativeProtect(PRTR0MEMOBJINTERNAL pMem, size_t offSub, size_t cbSub, uint32_t fProt)
+{
+    vm_map_t const pVmMap = rtR0MemObjNetBSDGetMap(pMem);
+    if (pVmMap)
+    {
+        vaddr_t const   AddrStart       = (vaddr_t)pMem->pv + offSub;
+        vm_prot_t       ProtectionFlags = 0;
+        if (fProt & RTMEM_PROT_READ)
+            ProtectionFlags |= UVM_PROT_R;
+        if (fProt & RTMEM_PROT_WRITE)
+            ProtectionFlags |= UVM_PROT_W;
+        if (fProt & RTMEM_PROT_EXEC)
+            ProtectionFlags |= UVM_PROT_X;
+
+        int rc = uvm_map_protect(pVmMap, AddrStart, AddrStart + cbSub, ProtectionFlags, 0);
+        if (!rc)
+            return VINF_SUCCESS;
+        return RTErrConvertFromErrno(rc);
+    }
+    return VERR_NOT_SUPPORTED;
+}
+
+
+DECLHIDDEN(RTHCPHYS) rtR0MemObjNativeGetPagePhysAddr(PRTR0MEMOBJINTERNAL pMem, size_t iPage)
+{
+    PRTR0MEMOBJNETBSD pMemNetBSD = (PRTR0MEMOBJNETBSD)pMem;
+
+    switch (pMemNetBSD->Core.enmType)
+    {
+        case RTR0MEMOBJTYPE_PAGE:
+        case RTR0MEMOBJTYPE_LOW:
+        {
+            vaddr_t va = (vaddr_t)pMemNetBSD->Core.pv + ptoa(iPage);
+            paddr_t pa = 0;
+            pmap_extract(pmap_kernel(), va, &pa);
+            return pa;
+        }
+        case RTR0MEMOBJTYPE_CONT:
+            return pMemNetBSD->Core.u.Cont.Phys + ptoa(iPage);
+        case RTR0MEMOBJTYPE_PHYS:
+            return pMemNetBSD->Core.u.Phys.PhysBase + ptoa(iPage);
+        case RTR0MEMOBJTYPE_PHYS_NC:
+        {
+            struct vm_page *page;
+            size_t i = 0;
+            TAILQ_FOREACH(page, &pMemNetBSD->pglist, pageq.queue)
+            {
+                if (i == iPage)
+                    break;
+                i++;
+            }
+            return VM_PAGE_TO_PHYS(page);
+        }
+        case RTR0MEMOBJTYPE_LOCK:
+        case RTR0MEMOBJTYPE_MAPPING:
+        {
+            pmap_t pmap;
+            if (pMem->u.Lock.R0Process == NIL_RTR0PROCESS)
+                pmap = pmap_kernel();
+            else
+                pmap = ((struct proc *)pMem->u.Lock.R0Process)->p_vmspace->vm_map.pmap;
+            vaddr_t va = (vaddr_t)pMemNetBSD->Core.pv + ptoa(iPage);
+            paddr_t pa = 0;
+            pmap_extract(pmap, va, &pa);
+            return pa;
+        }
+        case RTR0MEMOBJTYPE_RES_VIRT:
+            return NIL_RTHCPHYS;
+        default:
+            return NIL_RTHCPHYS;
+    }
+}
+
diff --git a/src/VBox/Runtime/r0drv/netbsd/memuserkernel-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/memuserkernel-r0drv-netbsd.c
new file mode 100644
index 00000000..e2704beb
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/memuserkernel-r0drv-netbsd.c
@@ -0,0 +1,92 @@
+/* $Id: memuserkernel-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - User & Kernel Memory, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2009-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/mem.h>
+#include <iprt/errcore.h>
+
+
+RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
+{
+    int rc = copyin((const void *)R3PtrSrc, pvDst, cb);
+    if (RT_LIKELY(rc == 0))
+        return VINF_SUCCESS;
+    return VERR_ACCESS_DENIED;
+}
+
+
+RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
+{
+    int rc = copyout(pvSrc, (void *)R3PtrDst, cb);
+    if (RT_LIKELY(rc == 0))
+        return VINF_SUCCESS;
+    return VERR_ACCESS_DENIED;
+}
+
+
+RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
+{
+    return R3Ptr < VM_MAXUSER_ADDRESS;
+}
+
+
+RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
+{
+    return (uintptr_t)pv >= VM_MAXUSER_ADDRESS;
+}
+
+
+RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
+{
+    return true;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyFrom(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
+
+
+RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
+{
+    return VERR_NOT_SUPPORTED;
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/mp-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/mp-r0drv-netbsd.c
new file mode 100644
index 00000000..3aef0355
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/mp-r0drv-netbsd.c
@@ -0,0 +1,53 @@
+/* $Id: mp-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Multiprocessor, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2008-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/mp.h>
+#include <iprt/errcore.h>
+#include <iprt/asm.h>
+#include <iprt/cpuset.h>
+#include "r0drv/mp-r0drv.h"
+
+
+RTDECL(RTCPUID) RTMpCpuId(void)
+{
+    return cpu_number();
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/process-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/process-r0drv-netbsd.c
new file mode 100644
index 00000000..1bd43674
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/process-r0drv-netbsd.c
@@ -0,0 +1,83 @@
+/* $Id: process-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Process Management, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/process.h>
+
+
+RTDECL(RTPROCESS) RTProcSelf(void)
+{
+    struct proc *pSelf = curproc;
+    return pSelf->p_pid;
+}
+
+
+RTR0DECL(RTR0PROCESS) RTR0ProcHandleSelf(void)
+{
+    return (RTR0PROCESS)curproc;
+}
+
diff --git a/src/VBox/Runtime/r0drv/netbsd/semevent-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/semevent-r0drv-netbsd.c
new file mode 100644
index 00000000..2c0a6e58
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/semevent-r0drv-netbsd.c
@@ -0,0 +1,294 @@
+/* $Id: semevent-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Single Release Event Semaphores, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTSEMEVENT_WITHOUT_REMAPPING
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/semaphore.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/lockvalidator.h>
+#include <iprt/mem.h>
+
+#include "sleepqueue-r0drv-netbsd.h"
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * NetBSD event semaphore.
+ */
+typedef struct RTSEMEVENTINTERNAL
+{
+    /** Magic value (RTSEMEVENT_MAGIC). */
+    uint32_t volatile   u32Magic;
+    /** The object status - !0 when signaled and 0 when reset. */
+    uint32_t volatile   fState;
+    /** Reference counter. */
+    uint32_t volatile   cRefs;
+} RTSEMEVENTINTERNAL, *PRTSEMEVENTINTERNAL;
+
+
+RTDECL(int)  RTSemEventCreate(PRTSEMEVENT phEventSem)
+{
+    return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
+}
+
+
+RTDECL(int)  RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
+{
+    AssertCompile(sizeof(RTSEMEVENTINTERNAL) > sizeof(void *));
+    AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
+    Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
+    AssertPtrReturn(phEventSem, VERR_INVALID_POINTER);
+
+    PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    pThis->u32Magic  = RTSEMEVENT_MAGIC;
+    pThis->cRefs     = 1;
+    pThis->fState    = 0;
+
+    *phEventSem = pThis;
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Retains a reference to the event semaphore.
+ *
+ * @param   pThis       The event semaphore.
+ */
+DECLINLINE(void) rtR0SemEventBsdRetain(PRTSEMEVENTINTERNAL pThis)
+{
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs < 100000); NOREF(cRefs);
+}
+
+
+/**
+ * Releases a reference to the event semaphore.
+ *
+ * @param   pThis       The event semaphore.
+ */
+DECLINLINE(void) rtR0SemEventBsdRelease(PRTSEMEVENTINTERNAL pThis)
+{
+    if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
+        RTMemFree(pThis);
+}
+
+
+RTDECL(int)  RTSemEventDestroy(RTSEMEVENT hEventSem)
+{
+    /*
+     * Validate input.
+     */
+    PRTSEMEVENTINTERNAL pThis = hEventSem;
+    if (pThis == NIL_RTSEMEVENT)
+        return VINF_SUCCESS;
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
+    Assert(pThis->cRefs > 0);
+
+    /*
+     * Invalidate it and signal the object just in case.
+     */
+    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
+    ASMAtomicWriteU32(&pThis->fState, 0);
+    rtR0SemBsdBroadcast(pThis);
+    rtR0SemEventBsdRelease(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemEventSignal(RTSEMEVENT hEventSem)
+{
+    /*
+     * Validate input.
+     */
+    PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
+    rtR0SemEventBsdRetain(pThis);
+
+    /*
+     * Signal the event object.
+     */
+    ASMAtomicWriteU32(&pThis->fState, 1);
+    rtR0SemBsdSignal(pThis);
+    rtR0SemEventBsdRelease(pThis);
+    return VINF_SUCCESS;
+}
+
+/**
+ * Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The event semaphore.
+ * @param   fFlags          See RTSemEventWaitEx.
+ * @param   uTimeout        See RTSemEventWaitEx.
+ * @param   pSrcPos         The source code position of the wait.
+ */
+static int rtR0SemEventWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
+                            PCRTLOCKVALSRCPOS pSrcPos)
+{
+    int rc;
+
+    /*
+     * Validate the input.
+     */
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
+    AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
+    rtR0SemEventBsdRetain(pThis);
+
+    /*
+     * Try grab the event without setting up the wait.
+     */
+    if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
+        rc = VINF_SUCCESS;
+    else
+    {
+        /*
+         * We have to wait.
+         */
+        RTR0SEMBSDSLEEP Wait;
+        rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
+        if (RT_SUCCESS(rc))
+        {
+            for (;;)
+            {
+                /* The destruction test. */
+                if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
+                    rc = VERR_SEM_DESTROYED;
+                else
+                {
+                    rtR0SemBsdWaitPrepare(&Wait);
+
+                    /* Check the exit conditions. */
+                    if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
+                        rc = VERR_SEM_DESTROYED;
+                    else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
+                        rc = VINF_SUCCESS;
+                    else if (rtR0SemBsdWaitHasTimedOut(&Wait))
+                        rc = VERR_TIMEOUT;
+                    else if (rtR0SemBsdWaitWasInterrupted(&Wait))
+                        rc = VERR_INTERRUPTED;
+                    else
+                    {
+                        /* Do the wait and then recheck the conditions. */
+                        rtR0SemBsdWaitDoIt(&Wait);
+                        continue;
+                    }
+                }
+                break;
+            }
+
+            rtR0SemBsdWaitDelete(&Wait);
+        }
+    }
+
+    rtR0SemEventBsdRelease(pThis);
+    return rc;
+}
+
+
+RTDECL(int)  RTSemEventWaitEx(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout)
+{
+#ifndef RTSEMEVENT_STRICT
+    return rtR0SemEventWait(hEventSem, fFlags, uTimeout, NULL);
+#else
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
+    return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
+#endif
+}
+RT_EXPORT_SYMBOL(RTSemEventWaitEx);
+
+
+RTDECL(int)  RTSemEventWaitExDebug(RTSEMEVENT hEventSem, uint32_t fFlags, uint64_t uTimeout,
+                                   RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
+    return rtR0SemEventWait(hEventSem, fFlags, uTimeout, &SrcPos);
+}
+RT_EXPORT_SYMBOL(RTSemEventWaitExDebug);
+
+
+RTDECL(uint32_t) RTSemEventGetResolution(void)
+{
+    return 1000000000 / hz;
+}
+
+RTR0DECL(bool) RTSemEventIsSignalSafe(void)
+{
+    /** @todo check the code...   */
+    return false;
+}
+
diff --git a/src/VBox/Runtime/r0drv/netbsd/semeventmulti-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/semeventmulti-r0drv-netbsd.c
new file mode 100644
index 00000000..84c2e726
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/semeventmulti-r0drv-netbsd.c
@@ -0,0 +1,360 @@
+/* $Id: semeventmulti-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTSEMEVENTMULTI_WITHOUT_REMAPPING
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/semaphore.h>
+
+#include <iprt/assert.h>
+#include <iprt/asm.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/lockvalidator.h>
+
+#include "sleepqueue-r0drv-netbsd.h"
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+/** @name fStateAndGen values
+ * @{ */
+/** The state bit number. */
+#define RTSEMEVENTMULTIBSD_STATE_BIT        0
+/** The state mask. */
+#define RTSEMEVENTMULTIBSD_STATE_MASK       RT_BIT_32(RTSEMEVENTMULTIBSD_STATE_BIT)
+/** The generation mask. */
+#define RTSEMEVENTMULTIBSD_GEN_MASK         ~RTSEMEVENTMULTIBSD_STATE_MASK
+/** The generation shift. */
+#define RTSEMEVENTMULTIBSD_GEN_SHIFT        1
+/** The initial variable value. */
+#define RTSEMEVENTMULTIBSD_STATE_GEN_INIT   UINT32_C(0xfffffffc)
+/** @}  */
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * NetBSD multiple release event semaphore.
+ */
+typedef struct RTSEMEVENTMULTIINTERNAL
+{
+    /** Magic value (RTSEMEVENTMULTI_MAGIC). */
+    uint32_t volatile   u32Magic;
+    /** The object state bit and generation counter.
+     * The generation counter is incremented every time the object is
+     * signalled. */
+    uint32_t volatile   fStateAndGen;
+    /** Reference counter. */
+    uint32_t volatile   cRefs;
+} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
+
+
+RTDECL(int)  RTSemEventMultiCreate(PRTSEMEVENTMULTI phEventMultiSem)
+{
+    return RTSemEventMultiCreateEx(phEventMultiSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
+}
+
+
+RTDECL(int)  RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
+                                     const char *pszNameFmt, ...)
+{
+    PRTSEMEVENTMULTIINTERNAL pThis;
+
+    AssertReturn(!(fFlags & ~RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
+    pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic     = RTSEMEVENTMULTI_MAGIC;
+        pThis->fStateAndGen = RTSEMEVENTMULTIBSD_STATE_GEN_INIT;
+        pThis->cRefs        = 1;
+
+        *phEventMultiSem = pThis;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+/**
+ * Retain a reference to the semaphore.
+ *
+ * @param   pThis       The semaphore.
+ */
+DECLINLINE(void) rtR0SemEventMultiBsdRetain(PRTSEMEVENTMULTIINTERNAL pThis)
+{
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    Assert(cRefs && cRefs < 100000);
+}
+
+
+/**
+ * Release a reference, destroy the thing if necessary.
+ *
+ * @param   pThis       The semaphore.
+ */
+DECLINLINE(void) rtR0SemEventMultiBsdRelease(PRTSEMEVENTMULTIINTERNAL pThis)
+{
+    if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
+    {
+        Assert(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC);
+        RTMemFree(pThis);
+    }
+}
+
+
+RTDECL(int)  RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
+{
+    /*
+     * Validate input.
+     */
+    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
+    if (pThis == NIL_RTSEMEVENTMULTI)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
+    Assert(pThis->cRefs > 0);
+
+    /*
+     * Invalidate it and signal the object just in case.
+     */
+    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENTMULTI_MAGIC);
+    ASMAtomicAndU32(&pThis->fStateAndGen, RTSEMEVENTMULTIBSD_GEN_MASK);
+    rtR0SemBsdBroadcast(pThis);
+    rtR0SemEventMultiBsdRelease(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
+{
+    uint32_t fNew;
+    uint32_t fOld;
+
+    /*
+     * Validate input.
+     */
+    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
+    rtR0SemEventMultiBsdRetain(pThis);
+
+    /*
+     * Signal the event object.  The cause of the parnoia here is racing to try
+     * deal with racing RTSemEventMultiSignal calls (should probably be
+     * forbidden, but it's relatively easy to handle).
+     */
+    do
+    {
+        fNew = fOld = ASMAtomicUoReadU32(&pThis->fStateAndGen);
+        fNew += 1 << RTSEMEVENTMULTIBSD_GEN_SHIFT;
+        fNew |= RTSEMEVENTMULTIBSD_STATE_MASK;
+    }
+    while (!ASMAtomicCmpXchgU32(&pThis->fStateAndGen, fNew, fOld));
+
+    rtR0SemBsdBroadcast(pThis);
+    rtR0SemEventMultiBsdRelease(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemEventMultiReset(RTSEMEVENTMULTI hEventMultiSem)
+{
+    /*
+     * Validate input.
+     */
+    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
+    rtR0SemEventMultiBsdRetain(pThis);
+
+    /*
+     * Reset it.
+     */
+    ASMAtomicAndU32(&pThis->fStateAndGen, ~RTSEMEVENTMULTIBSD_STATE_MASK);
+
+    rtR0SemEventMultiBsdRelease(pThis);
+    return VINF_SUCCESS;
+}
+
+
+/**
+ * Worker for RTSemEventMultiWaitEx and RTSemEventMultiWaitExDebug.
+ *
+ * @returns VBox status code.
+ * @param   pThis           The event semaphore.
+ * @param   fFlags          See RTSemEventMultiWaitEx.
+ * @param   uTimeout        See RTSemEventMultiWaitEx.
+ * @param   pSrcPos         The source code position of the wait.
+ */
+static int rtR0SemEventMultiBsdWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
+                                    PCRTLOCKVALSRCPOS pSrcPos)
+{
+    uint32_t    fOrgStateAndGen;
+    int         rc;
+
+    /*
+     * Validate the input.
+     */
+    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
+    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
+    AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
+    rtR0SemEventMultiBsdRetain(pThis);
+
+    /*
+     * Is the event already signalled or do we have to wait?
+     */
+    fOrgStateAndGen = ASMAtomicUoReadU32(&pThis->fStateAndGen);
+    if (fOrgStateAndGen & RTSEMEVENTMULTIBSD_STATE_MASK)
+        rc = VINF_SUCCESS;
+    else
+    {
+        /*
+         * We have to wait.
+         */
+        RTR0SEMBSDSLEEP Wait;
+        rc = rtR0SemBsdWaitInit(&Wait, fFlags, uTimeout, pThis);
+        if (RT_SUCCESS(rc))
+        {
+            for (;;)
+            {
+                /* The destruction test. */
+                if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
+                    rc = VERR_SEM_DESTROYED;
+                else
+                {
+                    rtR0SemBsdWaitPrepare(&Wait);
+
+                    /* Check the exit conditions. */
+                    if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
+                        rc = VERR_SEM_DESTROYED;
+                    else if (ASMAtomicUoReadU32(&pThis->fStateAndGen) != fOrgStateAndGen)
+                        rc = VINF_SUCCESS;
+                    else if (rtR0SemBsdWaitHasTimedOut(&Wait))
+                        rc = VERR_TIMEOUT;
+                    else if (rtR0SemBsdWaitWasInterrupted(&Wait))
+                        rc = VERR_INTERRUPTED;
+                    else
+                    {
+                        /* Do the wait and then recheck the conditions. */
+                        rtR0SemBsdWaitDoIt(&Wait);
+                        continue;
+                    }
+                }
+                break;
+            }
+
+            rtR0SemBsdWaitDelete(&Wait);
+        }
+    }
+
+    rtR0SemEventMultiBsdRelease(pThis);
+    return rc;
+}
+
+
+RTDECL(int)  RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
+{
+#ifndef RTSEMEVENT_STRICT
+    return rtR0SemEventMultiBsdWait(hEventMultiSem, fFlags, uTimeout, NULL);
+#else
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
+    return rtR0SemEventMultiBsdWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
+#endif
+}
+RT_EXPORT_SYMBOL(RTSemEventMultiWaitEx);
+
+
+RTDECL(int)  RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
+                                        RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
+    return rtR0SemEventMultiBsdWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
+}
+RT_EXPORT_SYMBOL(RTSemEventMultiWaitExDebug);
+
+
+RTDECL(uint32_t) RTSemEventMultiGetResolution(void)
+{
+    return rtR0SemBsdWaitGetResolution();
+}
+RT_EXPORT_SYMBOL(RTSemEventMultiGetResolution);
+
+
+RTR0DECL(bool) RTSemEventMultiIsSignalSafe(void)
+{
+    /** @todo check the code...   */
+    return false;
+}
+RT_EXPORT_SYMBOL(RTSemEventMultiIsSignalSafe);
+
diff --git a/src/VBox/Runtime/r0drv/netbsd/semfastmutex-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/semfastmutex-r0drv-netbsd.c
new file mode 100644
index 00000000..2718d5d8
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/semfastmutex-r0drv-netbsd.c
@@ -0,0 +1,146 @@
+/* $Id: semfastmutex-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Fast Mutex Semaphores, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/semaphore.h>
+#include <iprt/errcore.h>
+#include <iprt/alloc.h>
+#include <iprt/assert.h>
+#include <iprt/asm.h>
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the NetBSD (sleep) mutex.
+ */
+typedef struct RTSEMFASTMUTEXINTERNAL
+{
+    /** Magic value (RTSEMFASTMUTEX_MAGIC). */
+    uint32_t            u32Magic;
+    /** The NetBSD shared/exclusive lock mutex. */
+    krwlock_t           Mtx;
+} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
+
+
+RTDECL(int)  RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
+{
+    AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
+    AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
+
+    PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
+        rw_init(&pThis->Mtx);
+
+        *phFastMtx = pThis;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+RTDECL(int)  RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx)
+{
+    PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
+    if (pThis == NIL_RTSEMFASTMUTEX)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
+    rw_destroy(&pThis->Mtx);
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx)
+{
+    PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    rw_enter(&pThis->Mtx, RW_WRITER);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx)
+{
+    PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    rw_exit(&pThis->Mtx);
+    return VINF_SUCCESS;
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/semmutex-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/semmutex-r0drv-netbsd.c
new file mode 100644
index 00000000..16e8f272
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/semmutex-r0drv-netbsd.c
@@ -0,0 +1,228 @@
+/* $Id: semmutex-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Mutex Semaphores, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Copyright (C) 2010-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define RTSEMMUTEX_WITHOUT_REMAPPING
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/semaphore.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/thread.h>
+#include <iprt/time.h>
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the NetBSD (sleep) mutex.
+ */
+typedef struct RTSEMMUTEXINTERNAL
+{
+    /** Magic value (RTSEMMUTEX_MAGIC). */
+    uint32_t            u32Magic;
+    /** The NetBSD shared/exclusive lock mutex. */
+    struct sx           SxLock;
+} RTSEMMUTEXINTERNAL, *PRTSEMMUTEXINTERNAL;
+
+
+RTDECL(int)  RTSemMutexCreate(PRTSEMMUTEX phMutexSem)
+{
+    AssertCompile(sizeof(RTSEMMUTEXINTERNAL) > sizeof(void *));
+    AssertPtrReturn(phMutexSem, VERR_INVALID_POINTER);
+
+    PRTSEMMUTEXINTERNAL pThis = (PRTSEMMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (pThis)
+    {
+        pThis->u32Magic = RTSEMMUTEX_MAGIC;
+        sx_init_flags(&pThis->SxLock, "IPRT Mutex Semaphore", SX_RECURSE);
+
+        *phMutexSem = pThis;
+        return VINF_SUCCESS;
+    }
+    return VERR_NO_MEMORY;
+}
+
+
+RTDECL(int)  RTSemMutexDestroy(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    if (pThis == NIL_RTSEMMUTEX)
+        return VINF_SUCCESS;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, RTSEMMUTEX_MAGIC_DEAD, RTSEMMUTEX_MAGIC), VERR_INVALID_HANDLE);
+
+    sx_destroy(&pThis->SxLock);
+    RTMemFree(pThis);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    int                 rc;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    if (cMillies == RT_INDEFINITE_WAIT)
+    {
+        sx_xlock(&pThis->SxLock);
+        rc = VINF_SUCCESS;
+    }
+    else if (!cMillies)
+    {
+        if (sx_try_xlock(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_TIMEOUT;
+    }
+    /*
+     * GROSS HACK: poll implementation of timeout.
+     */
+    /** @todo Implement timeouts in RTSemMutexRequest. */
+    else if (sx_try_xlock(&pThis->SxLock))
+        rc = VINF_SUCCESS;
+    else
+    {
+        uint64_t StartTS = RTTimeSystemMilliTS();
+        rc = VERR_TIMEOUT;
+        do
+        {
+            RTThreadSleep(1);
+            if (sx_try_xlock(&pThis->SxLock))
+            {
+                rc = VINF_SUCCESS;
+                break;
+            }
+        } while (RTTimeSystemMilliTS() - StartTS < cMillies);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTSemMutexRequestDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    return RTSemMutexRequest(hMutexSem, cMillies);
+}
+
+
+RTDECL(int)  RTSemMutexRequestNoResume(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    int                 rc;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    if (cMillies == RT_INDEFINITE_WAIT)
+    {
+        if (!sx_xlock_sig(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_INTERRUPTED;
+    }
+    else if (!cMillies)
+    {
+        if (sx_try_xlock(&pThis->SxLock))
+            rc = VINF_SUCCESS;
+        else
+            rc = VERR_TIMEOUT;
+    }
+    /*
+     * GROSS HACK: poll implementation of timeout.
+     */
+    /** @todo Implement timeouts and interrupt checks in
+     *        RTSemMutexRequestNoResume. */
+    else if (sx_try_xlock(&pThis->SxLock))
+        rc = VINF_SUCCESS;
+    else
+    {
+        uint64_t StartTS = RTTimeSystemMilliTS();
+        rc = VERR_TIMEOUT;
+        do
+        {
+            RTThreadSleep(1);
+            if (sx_try_xlock(&pThis->SxLock))
+            {
+                rc = VINF_SUCCESS;
+                break;
+            }
+        } while (RTTimeSystemMilliTS() - StartTS < cMillies);
+    }
+
+    return rc;
+}
+
+
+RTDECL(int) RTSemMutexRequestNoResumeDebug(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, RTHCUINTPTR uId, RT_SRC_POS_DECL)
+{
+    return RTSemMutexRequestNoResume(hMutexSem, cMillies);
+}
+
+
+RTDECL(int)  RTSemMutexRelease(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
+
+    sx_xunlock(&pThis->SxLock);
+    return VINF_SUCCESS;
+}
+
+
+
+RTDECL(bool) RTSemMutexIsOwned(RTSEMMUTEX hMutexSem)
+{
+    PRTSEMMUTEXINTERNAL pThis = hMutexSem;
+    AssertPtrReturn(pThis, false);
+    AssertMsgReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), false);
+
+    return sx_xlocked(&pThis->SxLock);
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h b/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h
new file mode 100644
index 00000000..31cc97d4
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/sleepqueue-r0drv-netbsd.h
@@ -0,0 +1,300 @@
+/* $Id: sleepqueue-r0drv-netbsd.h $ */
+/** @file
+ * IPRT - NetBSD Ring-0 Driver Helpers for Abstracting Sleep Queues,
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h
+#define IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include "the-netbsd-kernel.h"
+
+#include <iprt/asm-math.h>
+#include <iprt/err.h>
+#include <iprt/time.h>
+
+static syncobj_t vbox_syncobj = {
+        SOBJ_SLEEPQ_SORTED,
+        sleepq_unsleep,
+        sleepq_changepri,
+        sleepq_lendpri,
+        syncobj_noowner,
+};
+
+/**
+ * Kernel mode NetBSD wait state structure.
+ */
+typedef struct RTR0SEMBSDSLEEP
+{
+    /** The absolute timeout given as nano seconds since the start of the
+     *  monotonic clock. */
+    uint64_t        uNsAbsTimeout;
+    /** The timeout in ticks. Updated after waiting. */
+    int             iTimeout;
+    /** Set if it's an indefinite wait. */
+    bool            fIndefinite;
+    /** Set if we've already timed out.
+     * Set by rtR0SemBsdWaitDoIt and read by rtR0SemBsdWaitHasTimedOut. */
+    bool            fTimedOut;
+    /** Flag whether the wait was interrupted. */
+    bool            fInterrupted;
+    /** flag whether the wait is interruptible or not. */
+    bool            fInterruptible;
+    /** Opaque wait channel id. */
+    wchan_t         wchan;
+    sleepq_t *sq;
+    kmutex_t *sq_lock;
+} RTR0SEMBSDSLEEP;
+/** Pointer to a NetBSD wait state. */
+typedef RTR0SEMBSDSLEEP *PRTR0SEMBSDSLEEP;
+
+
+/**
+ * Updates the timeout of the NetBSD wait.
+ *
+ * @returns RTSEMWAIT_FLAGS_INDEFINITE if the timeout value is too big.
+ *          0 otherwise
+ * @param   pWait               The wait structure.
+ * @param   uTimeout            The relative timeout in nanoseconds.
+ */
+DECLINLINE(void) rtR0SemBsdWaitUpdateTimeout(PRTR0SEMBSDSLEEP pWait)
+{
+    /* Convert absolute timeout to ticks */
+    uint64_t now = RTTimeNanoTS();
+    if (now >= pWait->uNsAbsTimeout) {
+        pWait->iTimeout = 0;
+    } else {
+        uint64_t nanos = pWait->uNsAbsTimeout - now;
+        pWait->iTimeout = hz * nanos / 1000000000;
+        /* for 1ms wait, wait at least one tick ?? */
+        if ((pWait->iTimeout == 0) && (nanos >= 1000000)) {
+            pWait->iTimeout = 1;
+        }
+    }
+}
+
+/**
+ * Initializes a wait.
+ *
+ * The caller MUST check the wait condition BEFORE calling this function or the
+ * timeout logic will be flawed.
+ *
+ * @returns VINF_SUCCESS or VERR_TIMEOUT.
+ * @param   pWait               The wait structure.
+ * @param   fFlags              The wait flags.
+ * @param   uTimeout            The timeout.
+ * @param   pvWaitChan          The opaque wait channel.
+ */
+DECLINLINE(int) rtR0SemBsdWaitInit(PRTR0SEMBSDSLEEP pWait, uint32_t fFlags, uint64_t uTimeout,
+                                   void *pvWaitChan)
+{
+    if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE) {
+        pWait->fIndefinite      = true;
+        pWait->iTimeout = 0;
+        pWait->uNsAbsTimeout = 0;
+    } else {
+        if (fFlags & RTSEMWAIT_FLAGS_RELATIVE) {
+            if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) {
+                pWait->uNsAbsTimeout = uTimeout * 1000000 + RTTimeSystemNanoTS();
+            } else {
+                pWait->uNsAbsTimeout = uTimeout + RTTimeSystemNanoTS();
+            }
+        } else {
+            if (fFlags & RTSEMWAIT_FLAGS_MILLISECS) {
+                pWait->uNsAbsTimeout = uTimeout * 1000000;
+            } else {
+                pWait->uNsAbsTimeout = uTimeout;
+            }
+        }
+        rtR0SemBsdWaitUpdateTimeout(pWait);
+        if (pWait->iTimeout == 0) {
+            return VERR_TIMEOUT;
+        }
+    }
+
+    pWait->fTimedOut   = false;
+    /*
+     * Initialize the wait queue related bits.
+     */
+    pWait->fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE
+                            ? true : false;
+    pWait->fInterrupted   = false;
+    pWait->wchan = pvWaitChan;
+    pWait->sq = NULL;
+    pWait->sq_lock = NULL;
+
+    return VINF_SUCCESS;
+}
+
+/**
+ * Prepares the next wait.
+ *
+ * This must be called before rtR0SemBsdWaitDoIt, and the caller should check
+ * the exit conditions inbetween the two calls.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitPrepare(PRTR0SEMBSDSLEEP pWait)
+{
+    pWait->sq = sleeptab_lookup(&sleeptab, pWait->wchan, &pWait->sq_lock);
+}
+
+/**
+ * Do the actual wait.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitDoIt(PRTR0SEMBSDSLEEP pWait)
+{
+#if __NetBSD_Prereq__(9,99,57)
+#define sleepq_enqueue(sq, wchan, wmesg, sobj) \
+            sleepq_enqueue((sq), (wchan), (wmesg), (sobj), true)
+#endif
+
+    sleepq_enter(pWait->sq, curlwp, pWait->sq_lock);
+    sleepq_enqueue(pWait->sq, pWait->wchan, "VBoxIS", &vbox_syncobj);
+
+    pWait->sq = NULL;
+    pWait->sq_lock = NULL;
+
+    int error = sleepq_block(pWait->iTimeout, pWait->fInterruptible
+#if __NetBSD_Prereq__(9,99,98)  /* a bit later, actually... */
+                             , &vbox_syncobj
+#endif
+        );
+    if (error == EWOULDBLOCK) {
+        if (!pWait->fIndefinite) {
+            pWait->fTimedOut = true;
+        }
+    } else if (error == ERESTART) {
+        if (pWait->fInterruptible) {
+            pWait->fInterrupted = true;
+        } else if (!pWait->fIndefinite) {
+            rtR0SemBsdWaitUpdateTimeout(pWait);
+            if (pWait->iTimeout == 0) {
+                pWait->fTimedOut = true;
+            }
+        }
+    } else if (error == EINTR) {
+        if (pWait->fInterruptible) {
+            pWait->fInterrupted = true;
+        } else if (!pWait->fIndefinite) {
+            rtR0SemBsdWaitUpdateTimeout(pWait);
+            if (pWait->iTimeout == 0) {
+                pWait->fTimedOut = true;
+            }
+        }
+    } else if (error) {
+        AssertMsgFailed(("sleepq_block -> %d\n", error));
+    }
+}
+
+
+/**
+ * Checks if a NetBSD wait was interrupted.
+ *
+ * @returns true / false
+ * @param   pWait               The wait structure.
+ * @remarks This shall be called before the first rtR0SemLnxWaitDoIt().
+ */
+DECLINLINE(bool) rtR0SemBsdWaitWasInterrupted(PRTR0SEMBSDSLEEP pWait)
+{
+    return pWait->fInterrupted;
+}
+
+
+/**
+ * Checks if a NetBSD wait has timed out.
+ *
+ * @returns true / false
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(bool) rtR0SemBsdWaitHasTimedOut(PRTR0SEMBSDSLEEP pWait)
+{
+    return pWait->fTimedOut;
+}
+
+
+/**
+ * Deletes a NetBSD wait.
+ *
+ * @param   pWait               The wait structure.
+ */
+DECLINLINE(void) rtR0SemBsdWaitDelete(PRTR0SEMBSDSLEEP pWait)
+{
+    if (pWait->sq_lock != NULL) {
+        mutex_spin_exit(pWait->sq_lock);
+        pWait->sq = NULL;
+        pWait->sq_lock = NULL;
+    }
+}
+
+
+/**
+ * Signals the wait channel.
+ *
+ * @param  pvWaitChan           The opaque wait channel handle.
+ */
+DECLINLINE(void) rtR0SemBsdSignal(void *pvWaitChan)
+{
+    kmutex_t *mp;
+    sleepq_t *sq = sleeptab_lookup(&sleeptab, pvWaitChan, &mp);
+    sleepq_wake(sq, pvWaitChan, 1, mp);
+}
+
+/**
+ * Wakes up all waiters on the wait channel.
+ *
+ * @param  pvWaitChan           The opaque wait channel handle.
+ */
+DECLINLINE(void) rtR0SemBsdBroadcast(void *pvWaitChan)
+{
+    kmutex_t *mp;
+    sleepq_t *sq = sleeptab_lookup(&sleeptab, pvWaitChan, &mp);
+    sleepq_wake(sq, pvWaitChan, ~0u, mp);
+}
+
+/**
+ * Gets the max resolution of the timeout machinery.
+ *
+ * @returns Resolution specified in nanoseconds.
+ */
+DECLINLINE(uint32_t) rtR0SemBsdWaitGetResolution(void)
+{
+    return 1000000000 / hz; /* ns */
+}
+
+#endif /* !IPRT_INCLUDED_SRC_r0drv_netbsd_sleepqueue_r0drv_netbsd_h */
diff --git a/src/VBox/Runtime/r0drv/netbsd/spinlock-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/spinlock-r0drv-netbsd.c
new file mode 100644
index 00000000..fe9c8d86
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/spinlock-r0drv-netbsd.c
@@ -0,0 +1,180 @@
+/* $Id: spinlock-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Spinlocks, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+
+#include <iprt/spinlock.h>
+#include <iprt/errcore.h>
+#include <iprt/alloc.h>
+#include <iprt/assert.h>
+#include <iprt/asm.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/thread.h>
+#include <iprt/mp.h>
+
+#include "internal/magics.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Wrapper for the struct mtx type.
+ */
+typedef struct RTSPINLOCKINTERNAL
+{
+    /** Spinlock magic value (RTSPINLOCK_MAGIC). */
+    uint32_t volatile   u32Magic;
+    /** The spinlock. */
+    kmutex_t            pSpinLock;
+    /** Saved interrupt flag. */
+    uint32_t volatile   fIntSaved;
+    /** The spinlock creation flags. */
+    uint32_t            fFlags;
+} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;
+
+
+RTDECL(int)  RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
+{
+    RT_ASSERT_PREEMPTIBLE();
+    AssertReturn(fFlags == RTSPINLOCK_FLAGS_INTERRUPT_SAFE || fFlags == RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, VERR_INVALID_PARAMETER);
+
+    /*
+     * Allocate.
+     */
+    AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)RTMemAllocZ(sizeof(*pThis));
+    if (!pThis)
+        return VERR_NO_MEMORY;
+
+    /*
+     * Initialize & return.
+     */
+    pThis->u32Magic  = RTSPINLOCK_MAGIC;
+    pThis->fFlags    = fFlags;
+    pThis->fIntSaved = 0;
+    if (fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE) {
+        mutex_init(&pThis->pSpinLock, MUTEX_DEFAULT, IPL_BIO);
+    } else {
+        mutex_init(&pThis->pSpinLock, MUTEX_DEFAULT, IPL_NONE);
+    }
+
+    *pSpinlock = pThis;
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int)  RTSpinlockDestroy(RTSPINLOCK Spinlock)
+{
+    /*
+     * Validate input.
+     */
+    RT_ASSERT_INTS_ON();
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    if (!pThis)
+        return VERR_INVALID_PARAMETER;
+    AssertMsgReturn(pThis->u32Magic == RTSPINLOCK_MAGIC,
+                    ("Invalid spinlock %p magic=%#x\n", pThis, pThis->u32Magic),
+                    VERR_INVALID_PARAMETER);
+
+    /*
+     * Make the lock invalid and release the memory.
+     */
+    ASMAtomicIncU32(&pThis->u32Magic);
+    mutex_destroy(&pThis->pSpinLock);
+    RTMemFree(pThis);
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    RT_ASSERT_PREEMPT_CPUID_VAR();
+    AssertPtr(pThis);
+    Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
+
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE) {
+        mutex_spin_enter(&pThis->pSpinLock);
+    } else {
+        mutex_enter(&pThis->pSpinLock);
+    }
+}
+
+
+RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
+{
+    PRTSPINLOCKINTERNAL pThis = (PRTSPINLOCKINTERNAL)Spinlock;
+    AssertPtr(pThis);
+    Assert(pThis->u32Magic == RTSPINLOCK_MAGIC);
+
+    if (pThis->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE) {
+        mutex_spin_exit(&pThis->pSpinLock);
+    } else {
+        mutex_exit(&pThis->pSpinLock);
+    }
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/the-netbsd-kernel.h b/src/VBox/Runtime/r0drv/netbsd/the-netbsd-kernel.h
new file mode 100644
index 00000000..ba493efd
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/the-netbsd-kernel.h
@@ -0,0 +1,107 @@
+/* $Id: the-netbsd-kernel.h $ */
+/** @file
+ * IPRT - Ring-0 Driver, The NetBSD Kernel Headers.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r0drv_netbsd_the_netbsd_kernel_h
+#define IPRT_INCLUDED_SRC_r0drv_netbsd_the_netbsd_kernel_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/types.h>
+
+/* Deal with conflicts first. */
+#include <sys/param.h>
+#undef PVM
+#include <sys/bus.h>
+#include <sys/types.h>
+#include <sys/errno.h>
+#include <sys/kernel.h>
+#include <sys/uio.h>
+#include <sys/systm.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/syslimits.h>
+#include <sys/sleepq.h>
+#include <sys/unistd.h>
+#include <sys/kthread.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/sched.h>
+#include <sys/callout.h>
+#include <sys/rwlock.h>
+#include <sys/kmem.h>
+#include <sys/cpu.h>
+#include <sys/vmmeter.h>        /* cnt */
+#include <sys/resourcevar.h>
+#include <uvm/uvm.h>
+#include <uvm/uvm_extern.h>
+#include <uvm/uvm_page.h>
+#include <machine/cpu.h>
+
+/**
+ * Check whether we can use kmem_alloc_prot.
+ */
+#if 0 /** @todo Not available yet. */
+# define USE_KMEM_ALLOC_PROT
+#endif
+
+#endif /* !IPRT_INCLUDED_SRC_r0drv_netbsd_the_netbsd_kernel_h */
diff --git a/src/VBox/Runtime/r0drv/netbsd/thread-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/thread-r0drv-netbsd.c
new file mode 100644
index 00000000..842e1a75
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/thread-r0drv-netbsd.c
@@ -0,0 +1,193 @@
+/* $Id: thread-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Threads (Part 1), Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#include "internal/iprt.h"
+#include <iprt/thread.h>
+
+#include <iprt/asm.h>
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mp.h>
+#include "internal/thread.h"
+
+
+RTDECL(RTNATIVETHREAD) RTThreadNativeSelf(void)
+{
+    return (RTNATIVETHREAD)curlwp;
+}
+
+
+static int rtR0ThreadNbsdSleepCommon(RTMSINTERVAL cMillies)
+{
+    int rc;
+    int cTicks;
+
+    /*
+     * 0 ms sleep -> yield.
+     */
+    if (!cMillies)
+    {
+        RTThreadYield();
+        return VINF_SUCCESS;
+    }
+
+    /*
+     * Translate milliseconds into ticks and go to sleep.
+     */
+    if (cMillies != RT_INDEFINITE_WAIT)
+    {
+        if (hz == 1000)
+            cTicks = cMillies;
+        else if (hz == 100)
+            cTicks = cMillies / 10;
+        else
+        {
+            int64_t cTicks64 = ((uint64_t)cMillies * hz) / 1000;
+            cTicks = (int)cTicks64;
+            if (cTicks != cTicks64)
+                cTicks = INT_MAX;
+        }
+    }
+    else
+        cTicks = 0;     /* requires giant lock! */
+
+    rc = tsleep((void *)RTThreadSleep,
+                PZERO | PCATCH,
+                "iprtsl",           /* max 6 chars */
+                cTicks);
+    switch (rc)
+    {
+        case 0:
+            return VINF_SUCCESS;
+        case EWOULDBLOCK:
+            return VERR_TIMEOUT;
+        case EINTR:
+        case ERESTART:
+            return VERR_INTERRUPTED;
+        default:
+            AssertMsgFailed(("%d\n", rc));
+            return VERR_NO_TRANSLATION;
+    }
+}
+
+
+RTDECL(int) RTThreadSleep(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadNbsdSleepCommon(cMillies);
+}
+
+
+RTDECL(int) RTThreadSleepNoLog(RTMSINTERVAL cMillies)
+{
+    return rtR0ThreadNbsdSleepCommon(cMillies);
+}
+
+
+RTDECL(bool) RTThreadYield(void)
+{
+    yield();
+    return true;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsEnabled(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD);
+
+    return curlwp->l_dopreempt == 0
+        && ASMIntAreEnabled(); /** @todo is there a native netbsd function/macro for this? */
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPending(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD);
+
+    return curlwp->l_dopreempt;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPendingTrusty(void)
+{
+    /* yes, RTThreadPreemptIsPending is reliable. */
+    return true;
+}
+
+
+RTDECL(bool) RTThreadPreemptIsPossible(void)
+{
+    /* yes, kernel preemption is possible. */
+    return true;
+}
+
+
+RTDECL(void) RTThreadPreemptDisable(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+
+    curlwp->l_nopreempt++;
+    __insn_barrier();
+}
+
+
+RTDECL(void) RTThreadPreemptRestore(PRTTHREADPREEMPTSTATE pState)
+{
+    AssertPtr(pState);
+    __insn_barrier();
+    if (--curlwp->l_nopreempt != 0)
+        return;
+    __insn_barrier();
+    if (__predict_false(curlwp->l_dopreempt))
+        kpreempt(0);
+    __insn_barrier();
+}
+
+
+RTDECL(bool) RTThreadIsInInterrupt(RTTHREAD hThread)
+{
+    Assert(hThread == NIL_RTTHREAD); NOREF(hThread);
+    /** @todo NetBSD: Implement RTThreadIsInInterrupt. Required for guest
+     *        additions! */
+    return !ASMIntAreEnabled();
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/thread2-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/thread2-r0drv-netbsd.c
new file mode 100644
index 00000000..5ec65665
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/thread2-r0drv-netbsd.c
@@ -0,0 +1,167 @@
+/* $Id: thread2-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Threads (Part 2), Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+
+#include <iprt/thread.h>
+#include <iprt/errcore.h>
+#include <iprt/assert.h>
+
+#include "internal/thread.h"
+
+
+DECLHIDDEN(int) rtThreadNativeInit(void)
+{
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(RTTHREAD) RTThreadSelf(void)
+{
+    return rtThreadGetByNative(RTThreadNativeSelf());
+}
+
+
+DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
+{
+    int iPriority;
+
+    switch (enmType)
+    {
+        case RTTHREADTYPE_INFREQUENT_POLLER:    iPriority = PZERO + 8;      break;
+        case RTTHREADTYPE_EMULATION:            iPriority = PZERO + 4;      break;
+        case RTTHREADTYPE_DEFAULT:              iPriority = PZERO;          break;
+        case RTTHREADTYPE_MSG_PUMP:             iPriority = PZERO - 4;      break;
+        case RTTHREADTYPE_IO:                   iPriority = PRIBIO;         break;
+        case RTTHREADTYPE_TIMER:                iPriority = PSWP;           break;
+        default:
+            AssertMsgFailed(("enmType=%d\n", enmType));
+            return VERR_INVALID_PARAMETER;
+    }
+
+    lwp_lock(curlwp);
+    lwp_changepri(curlwp, iPriority);
+    lwp_unlock(curlwp);
+
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtThreadNativeAdopt(PRTTHREADINT pThread)
+{
+    NOREF(pThread);
+    /* There is nothing special that needs doing here, but the
+       user really better know what he's cooking. */
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(void) rtThreadNativeWaitKludge(PRTTHREADINT pThread)
+{
+    /** @todo fix RTThreadWait/RTR0Term race on netbsd. */
+    RTThreadSleep(1);
+}
+
+
+DECLHIDDEN(void) rtThreadNativeDestroy(PRTTHREADINT pThread)
+{
+    NOREF(pThread);
+}
+
+
+/**
+ * Native thread main function.
+ *
+ * @param   pvThreadInt     The thread structure.
+ */
+static void rtThreadNativeMain(void *pvThreadInt)
+{
+    const struct lwp *Self = curlwp;
+    PRTTHREADINT pThreadInt = (PRTTHREADINT)pvThreadInt;
+    int rc;
+
+    rc = rtThreadMain(pThreadInt, (RTNATIVETHREAD)Self, &pThreadInt->szName[0]);
+
+    kthread_exit(rc);
+}
+
+
+DECLHIDDEN(int) rtThreadNativeCreate(PRTTHREADINT pThreadInt, PRTNATIVETHREAD pNativeThread)
+{
+    int rc;
+    struct lwp *l;
+
+    rc = kthread_create(PRI_NONE, 0, NULL, rtThreadNativeMain, (void *)pThreadInt, &l, "%s", pThreadInt->szName);
+
+    if (!rc)
+    {
+        *pNativeThread = (RTNATIVETHREAD)l;
+        rc = VINF_SUCCESS;
+    }
+    else
+        rc = RTErrConvertFromErrno(rc);
+    return rc;
+}
diff --git a/src/VBox/Runtime/r0drv/netbsd/time-r0drv-netbsd.c b/src/VBox/Runtime/r0drv/netbsd/time-r0drv-netbsd.c
new file mode 100644
index 00000000..a65ca257
--- /dev/null
+++ b/src/VBox/Runtime/r0drv/netbsd/time-r0drv-netbsd.c
@@ -0,0 +1,105 @@
+/* $Id: time-r0drv-netbsd.c $ */
+/** @file
+ * IPRT - Time, Ring-0 Driver, NetBSD.
+ */
+
+/*
+ * Contributed by knut st. osmundsen.
+ *
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ * --------------------------------------------------------------------
+ *
+ * Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "the-netbsd-kernel.h"
+#define RTTIME_INCL_TIMESPEC
+
+#include <iprt/time.h>
+
+
+RTDECL(uint64_t) RTTimeNanoTS(void)
+{
+    struct timespec tsp;
+    nanotime(&tsp);
+    return tsp.tv_sec * RT_NS_1SEC_64
+         + tsp.tv_nsec;
+}
+
+
+RTDECL(uint64_t) RTTimeMilliTS(void)
+{
+    return RTTimeNanoTS() / RT_NS_1MS;
+}
+
+
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+    return RTTimeNanoTS();
+}
+
+
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+    return RTTimeMilliTS();
+}
+
+
+RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
+{
+    struct timespec tsp;
+    nanotime(&tsp);
+    return RTTimeSpecSetTimespec(pTime, &tsp);
+}