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diff --git a/src/VBox/Runtime/r0drv/darwin/the-darwin-kernel.h b/src/VBox/Runtime/r0drv/darwin/the-darwin-kernel.h
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+++ b/src/VBox/Runtime/r0drv/darwin/the-darwin-kernel.h
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+/* $Id: the-darwin-kernel.h $ */
+/** @file
+ * IPRT - Include all necessary headers for the Darwing kernel.
+ */
+
+/*
+ * Copyright (C) 2006-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ */
+
+#ifndef IPRT_INCLUDED_SRC_r0drv_darwin_the_darwin_kernel_h
+#define IPRT_INCLUDED_SRC_r0drv_darwin_the_darwin_kernel_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/* Problematic header(s) containing conflicts with IPRT first. (FreeBSD has fixed these ages ago.) */
+#define __STDC_CONSTANT_MACROS
+#define __STDC_LIMIT_MACROS
+#include <sys/param.h>
+#include <mach/vm_param.h>
+#undef ALIGN
+#undef MIN
+#undef MAX
+#undef PAGE_SIZE
+#undef PAGE_SHIFT
+#undef PVM
+
+
+/* Include the IPRT definitions of the conflicting #defines & typedefs. */
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/param.h>
+
+
+/* After including cdefs, we can check that this really is Darwin. */
+#ifndef RT_OS_DARWIN
+# error "RT_OS_DARWIN must be defined!"
+#endif
+
+#if defined(__clang__) || RT_GNUC_PREREQ(4, 4)
+# pragma GCC diagnostic push
+#endif
+#if defined(__clang__) || RT_GNUC_PREREQ(4, 2)
+# pragma GCC diagnostic ignored "-Wc++11-extensions"
+# pragma GCC diagnostic ignored "-Wc99-extensions"
+# pragma GCC diagnostic ignored "-Wextra-semi"
+# pragma GCC diagnostic ignored "-Wzero-length-array"
+# pragma GCC diagnostic ignored "-Wgnu-zero-variadic-macro-arguments"
+#endif
+
+/* now we're ready for including the rest of the Darwin headers. */
+#include <kern/thread.h>
+#include <kern/clock.h>
+#include <kern/sched_prim.h>
+#include <kern/locks.h>
+#if defined(RT_ARCH_X86) && MAC_OS_X_VERSION_MIN_REQUIRED < 1060
+# include <i386/mp_events.h>
+#endif
+#include <libkern/libkern.h>
+#include <libkern/sysctl.h>
+#include <libkern/version.h>
+#include <mach/thread_act.h>
+#include <mach/vm_map.h>
+#include <mach/vm_region.h>
+#include <pexpert/pexpert.h>
+#include <sys/conf.h>
+#include <sys/errno.h>
+#include <sys/ioccom.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/fcntl.h>
+#include <IOKit/IOTypes.h>
+#include <IOKit/IOLib.h> /* Note! Has Assert down as a function. */
+#include <IOKit/IOMemoryDescriptor.h>
+#include <IOKit/IOBufferMemoryDescriptor.h>
+#include <IOKit/IOMapper.h>
+
+#if defined(__clang__) || RT_GNUC_PREREQ(4, 4)
+# pragma GCC diagnostic pop
+#endif
+
+
+/* See osfmk/kern/ast.h. */
+#ifndef AST_PREEMPT
+# define AST_PREEMPT UINT32_C(1)
+# define AST_QUANTUM UINT32_C(2)
+# define AST_URGENT UINT32_C(4)
+#endif
+
+/* This flag was added in 10.6, it seems. Should be harmless in earlier
+ releases... */
+#if __MAC_OS_X_VERSION_MAX_ALLOWED < 1060
+# define kIOMemoryMapperNone UINT32_C(0x800)
+#endif
+
+/* This flag was added in 10.8.2, it seems. */
+#if __MAC_OS_X_VERSION_MAX_ALLOWED < 1082
+# define kIOMemoryHostPhysicallyContiguous UINT32_C(0x00000080)
+#endif
+
+/** @name Macros for preserving EFLAGS.AC (despair / paranoid)
+ * @remarks Unlike linux, we have to restore it unconditionally on darwin.
+ * @{ */
+#include <iprt/asm-amd64-x86.h>
+#include <iprt/x86.h>
+#define IPRT_DARWIN_SAVE_EFL_AC() RTCCUINTREG const fSavedEfl = ASMGetFlags();
+#define IPRT_DARWIN_RESTORE_EFL_AC() ASMSetFlags(fSavedEfl)
+#define IPRT_DARWIN_RESTORE_EFL_ONLY_AC() ASMChangeFlags(~X86_EFL_AC, fSavedEfl & X86_EFL_AC)
+#define IPRT_DARWIN_RESTORE_EFL_ONLY_AC_EX(a_fSavedEfl) ASMChangeFlags(~X86_EFL_AC, (a_fSavedEfl) & X86_EFL_AC)
+/** @} */
+
+
+RT_C_DECLS_BEGIN
+
+/* mach/vm_types.h */
+typedef struct pmap *pmap_t;
+
+/* vm/vm_kern.h */
+extern vm_map_t kernel_map;
+
+/* vm/pmap.h */
+extern pmap_t kernel_pmap;
+
+/* kern/task.h */
+extern vm_map_t get_task_map(task_t);
+
+/* osfmk/i386/pmap.h */
+extern ppnum_t pmap_find_phys(pmap_t, addr64_t);
+
+/* vm/vm_map.h */
+extern kern_return_t vm_map_wire(vm_map_t, vm_map_offset_t, vm_map_offset_t, vm_prot_t, boolean_t);
+extern kern_return_t vm_map_unwire(vm_map_t, vm_map_offset_t, vm_map_offset_t, boolean_t);
+
+/* mach/i386/thread_act.h */
+extern kern_return_t thread_terminate(thread_t);
+
+/* osfmk/i386/mp.h */
+extern void mp_rendezvous(void (*)(void *), void (*)(void *), void (*)(void *), void *);
+extern void mp_rendezvous_no_intrs(void (*)(void *), void *);
+
+/* osfmk/i386/cpu_data.h */
+struct my_cpu_data_x86
+{
+ struct my_cpu_data_x86 *cpu_this;
+ thread_t cpu_active_thread;
+ void *cpu_int_state;
+ vm_offset_t cpu_active_stack;
+ vm_offset_t cpu_kernel_stack;
+ vm_offset_t cpu_int_stack_top;
+ int cpu_preemption_level;
+ int cpu_simple_lock_count;
+ int cpu_interrupt_level;
+ int cpu_number;
+ int cpu_phys_number;
+ cpu_id_t cpu_id;
+ int cpu_signals;
+ int cpu_mcount_off;
+ /*ast_t*/uint32_t cpu_pending_ast;
+ int cpu_type;
+ int cpu_subtype;
+ int cpu_threadtype;
+ int cpu_running;
+};
+
+/* osfmk/i386/cpu_number.h */
+extern int cpu_number(void);
+
+/* osfmk/vm/vm_user.c */
+extern kern_return_t vm_protect(vm_map_t, vm_offset_t, vm_size_t, boolean_t, vm_prot_t);
+/*extern kern_return_t vm_region(vm_map_t, vm_address_t *, vm_size_t *, vm_region_flavor_t, vm_region_info_t,
+ mach_msg_type_number_t *, mach_port_t *);*/
+
+/* i386/machine_routines.h */
+extern int ml_get_max_cpus(void);
+
+RT_C_DECLS_END
+
+
+/*
+ * Internals of the Darwin Ring-0 IPRT.
+ */
+RT_C_DECLS_BEGIN
+
+/* initterm-r0drv-darwin.cpp. */
+typedef uint32_t * (*PFNR0DARWINASTPENDING)(void);
+typedef void (*PFNR0DARWINCPUINTERRUPT)(int);
+extern lck_grp_t *g_pDarwinLockGroup;
+extern PFNR0DARWINASTPENDING g_pfnR0DarwinAstPending;
+extern PFNR0DARWINCPUINTERRUPT g_pfnR0DarwinCpuInterrupt;
+#ifdef DEBUG /* Used once for debugging memory issues (see #9466). */
+typedef kern_return_t (*PFNR0DARWINVMFAULTEXTERNAL)(vm_map_t, vm_map_offset_t, vm_prot_t, boolean_t, int, pmap_t, vm_map_offset_t);
+extern PFNR0DARWINVMFAULTEXTERNAL g_pfnR0DarwinVmFaultExternal;
+#endif
+
+/* threadpreempt-r0drv-darwin.cpp */
+int rtThreadPreemptDarwinInit(void);
+void rtThreadPreemptDarwinTerm(void);
+
+RT_C_DECLS_END
+
+
+/**
+ * Converts from nanoseconds to Darwin absolute time units.
+ * @returns Darwin absolute time.
+ * @param u64Nano Time interval in nanoseconds
+ */
+DECLINLINE(uint64_t) rtDarwinAbsTimeFromNano(const uint64_t u64Nano)
+{
+ uint64_t u64AbsTime;
+ nanoseconds_to_absolutetime(u64Nano, &u64AbsTime);
+ return u64AbsTime;
+}
+
+
+#include <iprt/err.h>
+
+/**
+ * Convert from mach kernel return code to IPRT status code.
+ * @todo put this where it belongs! (i.e. in a separate file and prototype in iprt/err.h)
+ */
+DECLINLINE(int) RTErrConvertFromMachKernReturn(kern_return_t rc)
+{
+ switch (rc)
+ {
+ case KERN_SUCCESS: return VINF_SUCCESS;
+ default: return VERR_GENERAL_FAILURE;
+ }
+}
+
+#endif /* !IPRT_INCLUDED_SRC_r0drv_darwin_the_darwin_kernel_h */
+