Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

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

12 files changed, 2042 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/darwin/Makefile.kup b/src/VBox/Runtime/r3/darwin/Makefile.kup
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/Makefile.kup
diff --git a/src/VBox/Runtime/r3/darwin/RTCrStoreCreateSnapshotById-darwin.cpp b/src/VBox/Runtime/r3/darwin/RTCrStoreCreateSnapshotById-darwin.cpp
new file mode 100644
index 00000000..6b67ec9d
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/RTCrStoreCreateSnapshotById-darwin.cpp
@@ -0,0 +1,248 @@
+/* $Id: RTCrStoreCreateSnapshotById-darwin.cpp $ */
+/** @file
+ * IPRT - RTCrStoreCreateSnapshotById, Darwin.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/crypto/store.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/file.h>
+
+/* HACK ALERT! Shut up those deprecated messages on SecKeychainSearchCreateFromAttributes and SecKeychainSearchCopyNext. */
+#include <CoreFoundation/CoreFoundation.h>
+#undef  DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER
+#define DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER
+
+#include <Security/Security.h>
+
+
+/**
+ * Checks the trust settings of the certificate.
+ *
+ * @returns true if not out-right distructed, otherwise false.
+ * @param   hCert           The certificate.
+ * @param   enmTrustDomain  The trust settings domain to check relative to.
+ */
+static bool rtCrStoreIsDarwinCertTrustworthy(SecCertificateRef hCert, SecTrustSettingsDomain enmTrustDomain)
+{
+    bool fResult = true;
+    CFArrayRef hTrustSettings;
+    OSStatus orc = SecTrustSettingsCopyTrustSettings(hCert, enmTrustDomain, &hTrustSettings);
+    if (orc == noErr)
+    {
+        CFIndex const cTrustSettings = CFArrayGetCount(hTrustSettings);
+        for (CFIndex i = 0; i < cTrustSettings; i++)
+        {
+            CFDictionaryRef hDict = (CFDictionaryRef)CFArrayGetValueAtIndex(hTrustSettings, i);
+            AssertContinue(CFGetTypeID(hDict) == CFDictionaryGetTypeID());
+
+            CFNumberRef hNum = (CFNumberRef)CFDictionaryGetValue(hDict, kSecTrustSettingsResult);
+            if (hNum)
+            {
+                AssertContinue(CFGetTypeID(hNum) == CFNumberGetTypeID());
+                SInt32 iNum;
+                if (CFNumberGetValue(hNum, kCFNumberSInt32Type, &iNum))
+                {
+                    if (iNum == kSecTrustSettingsResultDeny)
+                    {
+                        fResult = false;
+                        break;
+                    }
+                }
+                /* No need to release hNum (get rule). */
+            }
+            /* No need to release hDict (get rule). */
+        }
+        CFRelease(hTrustSettings);
+    }
+    else if (orc != errSecItemNotFound)
+    {
+        AssertFailed();
+        fResult = false;
+    }
+    return fResult;
+}
+
+
+static int rtCrStoreAddCertsFromNativeKeychain(RTCRSTORE hStore, SecKeychainRef hKeychain, SecTrustSettingsDomain enmTrustDomain,
+                                               int rc, PRTERRINFO pErrInfo)
+{
+    /*
+     * Enumerate the certificates in the keychain.
+     */
+    SecKeychainSearchRef hSearch;
+    OSStatus orc = SecKeychainSearchCreateFromAttributes(hKeychain, kSecCertificateItemClass, NULL, &hSearch);
+    if (orc == noErr)
+    {
+        SecKeychainItemRef hItem;
+        while ((orc = SecKeychainSearchCopyNext(hSearch, &hItem)) == noErr)
+        {
+            Assert(CFGetTypeID(hItem) == SecCertificateGetTypeID());
+            SecCertificateRef hCert = (SecCertificateRef)hItem;
+
+            /*
+             * Check if the current certificate is at all trusted, skip it if it's isn't.
+             */
+            if (rtCrStoreIsDarwinCertTrustworthy(hCert, enmTrustDomain))
+            {
+                /*
+                 * Get the certificate data.
+                 */
+                CFDataRef hEncodedCert = SecCertificateCopyData(hCert);
+                Assert(hEncodedCert);
+                if (hEncodedCert)
+                {
+                    CFIndex         cbEncoded = CFDataGetLength(hEncodedCert);
+                    const uint8_t  *pbEncoded = CFDataGetBytePtr(hEncodedCert);
+
+                    RTERRINFOSTATIC StaticErrInfo;
+                    int rc2 = RTCrStoreCertAddEncoded(hStore, RTCRCERTCTX_F_ENC_X509_DER | RTCRCERTCTX_F_ADD_IF_NOT_FOUND,
+                                                      pbEncoded, cbEncoded, RTErrInfoInitStatic(&StaticErrInfo));
+                    if (RT_FAILURE(rc2))
+                    {
+                        if (RTErrInfoIsSet(&StaticErrInfo.Core))
+                            RTErrInfoAddF(pErrInfo, -rc2, "  %s", StaticErrInfo.Core.pszMsg);
+                        else
+                            RTErrInfoAddF(pErrInfo, -rc2, "  %Rrc adding cert", rc2);
+                        rc = -rc2;
+                    }
+
+                    CFRelease(hEncodedCert);
+                }
+            }
+
+            CFRelease(hItem);
+        }
+        if (orc != errSecItemNotFound)
+            rc = RTErrInfoAddF(pErrInfo, -VERR_SEARCH_ERROR,
+                               "  SecKeychainSearchCopyNext failed with %#x", orc);
+        CFRelease(hSearch);
+    }
+    else
+        rc = RTErrInfoAddF(pErrInfo, -VERR_SEARCH_ERROR,
+                           "  SecKeychainSearchCreateFromAttributes failed with %#x", orc);
+    return rc;
+}
+
+
+static int rtCrStoreAddCertsFromNativeKeychainFile(RTCRSTORE hStore, const char *pszKeychain,
+                                                   SecTrustSettingsDomain enmTrustDomain,
+                                                   int rc, PRTERRINFO pErrInfo)
+{
+    /*
+     * Open the keychain and call common worker to do the job.
+     */
+    SecKeychainRef hKeychain;
+    OSStatus orc = SecKeychainOpen(pszKeychain, &hKeychain);
+    if (orc == noErr)
+    {
+        rc = rtCrStoreAddCertsFromNativeKeychain(hStore, hKeychain, enmTrustDomain, rc, pErrInfo);
+
+        CFRelease(hKeychain);
+    }
+    else if (RTFileExists(pszKeychain))
+        rc = RTErrInfoAddF(pErrInfo, -VERR_OPEN_FAILED, "  SecKeychainOpen failed with %#x on '%s'", orc, pszKeychain);
+    return rc;
+}
+
+
+static int rtCrStoreAddCertsFromNativeKeystoreDomain(RTCRSTORE hStore, SecPreferencesDomain enmDomain,
+                                                     SecTrustSettingsDomain enmTrustDomain,
+                                                     int rc, PRTERRINFO pErrInfo)
+{
+    /*
+     * Get a list of keystores for this domain and call common worker on each.
+     */
+    CFArrayRef hKeychains;
+    OSStatus orc = SecKeychainCopyDomainSearchList(enmDomain, &hKeychains);
+    if (orc == noErr)
+    {
+        CFIndex const cEntries = CFArrayGetCount(hKeychains);
+        for (CFIndex i = 0; i < cEntries; i++)
+        {
+            SecKeychainRef hKeychain = (SecKeychainRef)CFArrayGetValueAtIndex(hKeychains, i);
+            Assert(CFGetTypeID(hKeychain) == SecKeychainGetTypeID());
+            CFRetain(hKeychain);
+
+            rc = rtCrStoreAddCertsFromNativeKeychain(hStore, hKeychain, enmTrustDomain, rc, pErrInfo);
+
+            CFRelease(hKeychain);
+        }
+
+        CFRelease(hKeychains);
+    }
+    else
+        rc = RTErrInfoAddF(pErrInfo, -VERR_SEARCH_ERROR,
+                           " SecKeychainCopyDomainSearchList failed with %#x on %d", orc, enmDomain);
+    return rc;
+}
+
+
+RTDECL(int) RTCrStoreCreateSnapshotById(PRTCRSTORE phStore, RTCRSTOREID enmStoreId, PRTERRINFO pErrInfo)
+{
+    AssertReturn(enmStoreId > RTCRSTOREID_INVALID && enmStoreId < RTCRSTOREID_END, VERR_INVALID_PARAMETER);
+
+    /*
+     * Create an empty in-memory store.
+     */
+    RTCRSTORE hStore;
+    int rc = RTCrStoreCreateInMem(&hStore, 128);
+    if (RT_SUCCESS(rc))
+    {
+        *phStore = hStore;
+
+        /*
+         * Load the certificates corresponding to the given virtual store ID.
+         */
+        switch (enmStoreId)
+        {
+            case RTCRSTOREID_USER_TRUSTED_CAS_AND_CERTIFICATES:
+                rc = rtCrStoreAddCertsFromNativeKeystoreDomain(hStore, kSecPreferencesDomainUser,
+                                                               kSecTrustSettingsDomainUser, rc, pErrInfo);
+                break;
+
+            case RTCRSTOREID_SYSTEM_TRUSTED_CAS_AND_CERTIFICATES:
+                rc = rtCrStoreAddCertsFromNativeKeystoreDomain(hStore, kSecPreferencesDomainSystem,
+                                                               kSecTrustSettingsDomainSystem, rc, pErrInfo);
+                rc = rtCrStoreAddCertsFromNativeKeychainFile(hStore,
+                                                             "/System/Library/Keychains/SystemRootCertificates.keychain",
+                                                             kSecTrustSettingsDomainSystem, rc, pErrInfo);
+                break;
+
+            default:
+                AssertFailed(); /* implement me */
+        }
+    }
+    else
+        RTErrInfoSet(pErrInfo, rc, "RTCrStoreCreateInMem failed");
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTCrStoreCreateSnapshotById);
+
diff --git a/src/VBox/Runtime/r3/darwin/RTPathUserDocuments-darwin.cpp b/src/VBox/Runtime/r3/darwin/RTPathUserDocuments-darwin.cpp
new file mode 100644
index 00000000..44695df6
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/RTPathUserDocuments-darwin.cpp
@@ -0,0 +1,99 @@
+/* $Id: RTPathUserDocuments-darwin.cpp $ */
+/** @file
+ * IPRT - RTPathUserDocuments, darwin ring-3.
+ */
+
+/*
+ * Copyright (C) 2011-2020 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/path.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/err.h>
+
+#include <NSSystemDirectories.h>
+#include <sys/syslimits.h>
+#ifdef IPRT_USE_CORE_SERVICE_FOR_USER_DOCUMENTS
+# include <CoreServices/CoreServices.h>
+#endif
+
+
+RTDECL(int) RTPathUserDocuments(char *pszPath, size_t cchPath)
+{
+    /*
+     * Validate input
+     */
+    AssertPtrReturn(pszPath, VERR_INVALID_POINTER);
+    AssertReturn(cchPath, VERR_INVALID_PARAMETER);
+
+    /*
+     * Try NSSystemDirectories first since that works for directories that doesn't exist.
+     */
+    int rc = VERR_PATH_NOT_FOUND;
+    NSSearchPathEnumerationState EnmState = NSStartSearchPathEnumeration(NSDocumentDirectory, NSUserDomainMask);
+    if (EnmState != 0)
+    {
+        char szTmp[PATH_MAX];
+        szTmp[0] = szTmp[PATH_MAX - 1] = '\0';
+        EnmState = NSGetNextSearchPathEnumeration(EnmState, szTmp);
+        if (EnmState != 0)
+        {
+            size_t cchTmp = strlen(szTmp);
+            if (cchTmp >= cchPath)
+                return VERR_BUFFER_OVERFLOW;
+
+            if (szTmp[0] == '~' && szTmp[1] == '/')
+            {
+                /* Expand tilde. */
+                rc = RTPathUserHome(pszPath, cchPath - cchTmp + 2);
+                if (RT_FAILURE(rc))
+                    return rc;
+                rc = RTPathAppend(pszPath, cchPath, &szTmp[2]);
+            }
+            else
+                rc = RTStrCopy(pszPath, cchPath, szTmp);
+            return rc;
+        }
+    }
+
+#ifdef IPRT_USE_CORE_SERVICE_FOR_USER_DOCUMENTS
+    /*
+     * Fall back on FSFindFolder in case the above should fail...
+     */
+    FSRef ref;
+    OSErr err = FSFindFolder(kOnAppropriateDisk, kDocumentsFolderType, false /* createFolder */, &ref);
+    if (err == noErr)
+    {
+        err = FSRefMakePath(&ref, (UInt8*)pszPath, cchPath);
+        if (err == noErr)
+            return VINF_SUCCESS;
+    }
+#endif
+    Assert(RT_FAILURE_NP(rc));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/RTSystemQueryDmiString-darwin.cpp b/src/VBox/Runtime/r3/darwin/RTSystemQueryDmiString-darwin.cpp
new file mode 100644
index 00000000..f8d0a71f
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/RTSystemQueryDmiString-darwin.cpp
@@ -0,0 +1,153 @@
+/* $Id: RTSystemQueryDmiString-darwin.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryDmiString, darwin ring-3.
+ */
+
+/*
+ * Copyright (C) 2010-2020 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/system.h>
+#include "internal/iprt.h"
+
+#include <iprt/assert.h>
+#include <iprt/err.h>
+#include <iprt/mem.h>
+#include <iprt/string.h>
+
+#include <mach/mach_port.h>
+#include <IOKit/IOKitLib.h>
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#define IOCLASS_PLATFORMEXPERTDEVICE         "IOPlatformExpertDevice"
+#define PROP_PRODUCT_NAME                    "product-name"
+#define PROP_PRODUCT_VERSION                 "version"
+#define PROP_PRODUCT_SERIAL                  "IOPlatformSerialNumber"
+#define PROP_PRODUCT_UUID                    "IOPlatformUUID"
+#define PROP_MANUFACTURER                    "manufacturer"
+
+
+RTDECL(int) RTSystemQueryDmiString(RTSYSDMISTR enmString, char *pszBuf, size_t cbBuf)
+{
+    AssertPtrReturn(pszBuf, VERR_INVALID_POINTER);
+    AssertReturn(cbBuf > 0, VERR_INVALID_PARAMETER);
+    *pszBuf = '\0';
+    AssertReturn(enmString > RTSYSDMISTR_INVALID && enmString < RTSYSDMISTR_END, VERR_INVALID_PARAMETER);
+
+    CFStringRef PropStringRef = NULL;
+    switch (enmString)
+    {
+        case RTSYSDMISTR_PRODUCT_NAME:    PropStringRef = CFSTR(PROP_PRODUCT_NAME);    break;
+        case RTSYSDMISTR_PRODUCT_VERSION: PropStringRef = CFSTR(PROP_PRODUCT_VERSION); break;
+        case RTSYSDMISTR_PRODUCT_SERIAL:  PropStringRef = CFSTR(PROP_PRODUCT_SERIAL);  break;
+        case RTSYSDMISTR_PRODUCT_UUID:    PropStringRef = CFSTR(PROP_PRODUCT_UUID);    break;
+        case RTSYSDMISTR_MANUFACTURER:    PropStringRef = CFSTR(PROP_MANUFACTURER);    break;
+        default:
+            return VERR_NOT_SUPPORTED;
+    }
+
+    mach_port_t MasterPort;
+    kern_return_t kr = IOMasterPort(MACH_PORT_NULL, &MasterPort);
+    if (kr != kIOReturnSuccess)
+    {
+        if (kr == KERN_NO_ACCESS)
+            return VERR_ACCESS_DENIED;
+        return RTErrConvertFromDarwinIO(kr);
+    }
+
+    CFDictionaryRef ClassToMatch = IOServiceMatching(IOCLASS_PLATFORMEXPERTDEVICE);
+    if (!ClassToMatch)
+        return VERR_NOT_SUPPORTED;
+
+    /* IOServiceGetMatchingServices will always consume ClassToMatch. */
+    io_iterator_t Iterator;
+    kr = IOServiceGetMatchingServices(MasterPort, ClassToMatch, &Iterator);
+    if (kr != kIOReturnSuccess)
+        return RTErrConvertFromDarwinIO(kr);
+
+    int rc = VERR_NOT_SUPPORTED;
+    io_service_t ServiceObject;
+    while ((ServiceObject = IOIteratorNext(Iterator)))
+    {
+        if (   enmString == RTSYSDMISTR_PRODUCT_NAME
+            || enmString == RTSYSDMISTR_PRODUCT_VERSION
+            || enmString == RTSYSDMISTR_MANUFACTURER
+           )
+        {
+            CFDataRef DataRef = (CFDataRef)IORegistryEntryCreateCFProperty(ServiceObject, PropStringRef,
+                                                                           kCFAllocatorDefault, kNilOptions);
+            if (DataRef)
+            {
+                size_t         cbData  = CFDataGetLength(DataRef);
+                const char    *pchData = (const char *)CFDataGetBytePtr(DataRef);
+                rc = RTStrCopyEx(pszBuf, cbBuf, pchData, cbData);
+                CFRelease(DataRef);
+                break;
+            }
+        }
+        else
+        {
+            CFStringRef StringRef = (CFStringRef)IORegistryEntryCreateCFProperty(ServiceObject, PropStringRef,
+                                                                                 kCFAllocatorDefault, kNilOptions);
+            if (StringRef)
+            {
+                Boolean fRc = CFStringGetCString(StringRef, pszBuf, cbBuf, kCFStringEncodingUTF8);
+                if (fRc)
+                    rc = VINF_SUCCESS;
+                else
+                {
+                    CFIndex cwc    = CFStringGetLength(StringRef);
+                    size_t  cbTmp  = cwc + 1;
+                    char   *pszTmp = (char *)RTMemTmpAlloc(cbTmp);
+                    int     cTries = 1;
+                    while (   pszTmp
+                           && (fRc = CFStringGetCString(StringRef, pszTmp, cbTmp, kCFStringEncodingUTF8)) == FALSE
+                           && cTries++ < 4)
+                    {
+                        RTMemTmpFree(pszTmp);
+                        cbTmp *= 2;
+                        pszTmp = (char *)RTMemTmpAlloc(cbTmp);
+                    }
+                    if (fRc)
+                        rc = RTStrCopy(pszBuf, cbBuf, pszTmp);
+                    else if (!pszTmp)
+                        rc = VERR_NO_TMP_MEMORY;
+                    else
+                        rc = VERR_ACCESS_DENIED;
+                    RTMemFree(pszTmp);
+                }
+                CFRelease(StringRef);
+                break;
+            }
+        }
+    }
+
+    IOObjectRelease(ServiceObject);
+    IOObjectRelease(Iterator);
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp b/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp
new file mode 100644
index 00000000..0d92d6a5
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/filelock-darwin.cpp
@@ -0,0 +1,168 @@
+/* $Id: filelock-darwin.cpp $ */
+/** @file
+ * IPRT - File Locking, POSIX.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_FILE
+
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/fcntl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+#include <iprt/file.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include <iprt/err.h>
+#include <iprt/log.h>
+#include "internal/file.h"
+#include "internal/fs.h"
+
+
+
+
+RTR3DECL(int)  RTFileLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /* Check arguments. */
+    if (fLock & ~RTFILE_LOCK_MASK)
+    {
+        AssertMsgFailed(("Invalid fLock=%08X\n", fLock));
+        return VERR_INVALID_PARAMETER;
+    }
+
+    /*
+     * Validate offset.
+     */
+    if (    sizeof(off_t) < sizeof(cbLock)
+        &&  (    (offLock >> 32) != 0
+             ||  (cbLock >> 32) != 0
+             ||  ((offLock + cbLock) >> 32) != 0))
+    {
+        AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock));
+        return VERR_NOT_SUPPORTED;
+    }
+
+    /* Prepare flock structure. */
+    struct flock fl;
+    Assert(RTFILE_LOCK_WRITE);
+    fl.l_type   = (fLock & RTFILE_LOCK_WRITE) ? F_WRLCK : F_RDLCK;
+    fl.l_whence = SEEK_SET;
+    fl.l_start  = (off_t)offLock;
+    fl.l_len    = (off_t)cbLock;
+    fl.l_pid    = 0;
+
+    Assert(RTFILE_LOCK_WAIT);
+    if (fcntl(RTFileToNative(hFile), (fLock & RTFILE_LOCK_WAIT) ? F_SETLKW : F_SETLK, &fl) >= 0)
+        return VINF_SUCCESS;
+    int iErr = errno;
+    if (iErr == ENOTSUP)
+    {
+        /*
+         * This is really bad hack for getting VDIs to work somewhat
+         * safely on SMB mounts.
+         */
+        /** @todo we need to keep track of these locks really. Anyone requiring to lock more
+         * than one part of a file will have to fix this. */
+        unsigned f = 0;
+        Assert(RTFILE_LOCK_WAIT);
+        if (fLock & RTFILE_LOCK_WAIT)
+            f |= LOCK_NB;
+        if (fLock & RTFILE_LOCK_WRITE)
+            f |= LOCK_EX;
+        else
+            f |= LOCK_SH;
+        if (!flock(RTFileToNative(hFile), f))
+            return VINF_SUCCESS;
+        iErr = errno;
+        if (iErr == EWOULDBLOCK)
+            return VERR_FILE_LOCK_VIOLATION;
+    }
+
+    if (    iErr == EAGAIN
+        ||  iErr == EACCES)
+        return VERR_FILE_LOCK_VIOLATION;
+
+    return RTErrConvertFromErrno(iErr);
+}
+
+
+RTR3DECL(int)  RTFileChangeLock(RTFILE hFile, unsigned fLock, int64_t offLock, uint64_t cbLock)
+{
+    /** @todo We never returns VERR_FILE_NOT_LOCKED for now. */
+    return RTFileLock(hFile, fLock, offLock, cbLock);
+}
+
+
+RTR3DECL(int)  RTFileUnlock(RTFILE hFile, int64_t offLock, uint64_t cbLock)
+{
+    Assert(offLock >= 0);
+
+    /*
+     * Validate offset.
+     */
+    if (    sizeof(off_t) < sizeof(cbLock)
+        &&  (    (offLock >> 32) != 0
+             ||  (cbLock >> 32) != 0
+             ||  ((offLock + cbLock) >> 32) != 0))
+    {
+        AssertMsgFailed(("64-bit file i/o not supported! offLock=%lld cbLock=%lld\n", offLock, cbLock));
+        return VERR_NOT_SUPPORTED;
+    }
+
+    /* Prepare flock structure. */
+    struct flock fl;
+    fl.l_type   = F_UNLCK;
+    fl.l_whence = SEEK_SET;
+    fl.l_start  = (off_t)offLock;
+    fl.l_len    = (off_t)cbLock;
+    fl.l_pid    = 0;
+
+    if (fcntl(RTFileToNative(hFile), F_SETLK, &fl) >= 0)
+        return VINF_SUCCESS;
+
+    int iErr = errno;
+    if (iErr == ENOTSUP)
+    {
+        /* A SMB hack, see RTFileLock. */
+        if (!flock(RTFileToNative(hFile), LOCK_UN))
+            return VINF_SUCCESS;
+    }
+
+    /** @todo check error codes for non existing lock. */
+    if (    iErr == EAGAIN
+        ||  iErr == EACCES)
+        return VERR_FILE_LOCK_VIOLATION;
+
+    return RTErrConvertFromErrno(iErr);
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/krnlmod-darwin.cpp b/src/VBox/Runtime/r3/darwin/krnlmod-darwin.cpp
new file mode 100644
index 00000000..1aa3f739
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/krnlmod-darwin.cpp
@@ -0,0 +1,391 @@
+/* $Id: krnlmod-darwin.cpp $ */
+/** @file
+ * IPRT - Kernel module, Darwin.
+ */
+
+/*
+ * Copyright (C) 2017-2020 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYSTEM
+#include <iprt/krnlmod.h>
+
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/ldr.h>
+#include <iprt/mem.h>
+#include <iprt/once.h>
+#include <iprt/string.h>
+#include <iprt/types.h>
+
+#include <CoreFoundation/CoreFoundation.h>
+#include <IOKit/IOKitLib.h>
+
+
+/** @name Missing/private IOKitLib declarations and definitions.
+ * @{  */
+/** OSKextCopyLoadedKextInfo in IOKit. */
+typedef CFDictionaryRef (* PFNOSKEXTCOPYLOADEDKEXTINFO)(CFArrayRef, CFArrayRef);
+
+#ifndef kOSBundleRetainCountKey
+# define kOSBundleRetainCountKey CFSTR("OSBundleRetainCount")
+#endif
+#ifndef kOSBundleLoadSizeKey
+# define kOSBundleLoadSizeKey CFSTR("OSBundleLoadSize")
+#endif
+#ifndef kOSBundleLoadAddressKey
+# define kOSBundleLoadAddressKey CFSTR("OSBundleLoadAddress")
+#endif
+/** @} */
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Internal kernel information record state.
+ */
+typedef struct RTKRNLMODINFOINT
+{
+    /** Reference counter. */
+    volatile uint32_t   cRefs;
+    /** The dictionary containing our data. */
+    CFDictionaryRef     hDictKext;
+} RTKRNLMODINFOINT;
+/** Pointer to the internal kernel module information record. */
+typedef RTKRNLMODINFOINT *PRTKRNLMODINFOINT;
+/** Pointer to a const internal kernel module information record. */
+typedef const RTKRNLMODINFOINT *PCRTKRNLMODINFOINT;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static RTONCE                       g_GetIoKitApisOnce = RTONCE_INITIALIZER;
+static PFNOSKEXTCOPYLOADEDKEXTINFO  g_pfnOSKextCopyLoadedKextInfo = NULL;
+
+/** Do-once callback for setting g_pfnOSKextCopyLoadedKextInfo.   */
+static DECLCALLBACK(int) rtKrnlModDarwinResolveIoKitApis(void *pvUser)
+{
+    RTLDRMOD hMod;
+//    int rc = RTLdrLoad("/System/Library/Frameworks/IOKit.framework/Versions/Current/IOKit", &hMod);
+    int rc = RTLdrLoadEx("/System/Library/Frameworks/IOKit.framework/Versions/Current/IOKit", &hMod, RTLDRLOAD_FLAGS_NO_SUFFIX, NULL);
+    if (RT_SUCCESS(rc))
+        RTLdrGetSymbol(hMod, "OSKextCopyLoadedKextInfo",  (void **)&g_pfnOSKextCopyLoadedKextInfo);
+
+    RT_NOREF(pvUser);
+    return VINF_SUCCESS;
+}
+
+/**
+ * Returns the kext information dictionary structure matching the given name.
+ *
+ * @returns Pointer to the matching module information record on success or NULL if not found.
+ * @param   pszName          The name to look for.
+ */
+static CFDictionaryRef rtKrnlModDarwinGetKextInfoByName(const char *pszName)
+{
+    CFDictionaryRef hDictKext = NULL;
+
+    RTOnce(&g_GetIoKitApisOnce, rtKrnlModDarwinResolveIoKitApis, NULL);
+    if (g_pfnOSKextCopyLoadedKextInfo)
+    {
+        CFStringRef hKextName = CFStringCreateWithCString(kCFAllocatorDefault, pszName, kCFStringEncodingUTF8);
+        if (hKextName)
+        {
+            CFArrayRef hArrKextIdRef = CFArrayCreate(kCFAllocatorDefault, (const void **)&hKextName, 1, &kCFTypeArrayCallBacks);
+            if (hArrKextIdRef)
+            {
+                CFDictionaryRef hLoadedKexts = g_pfnOSKextCopyLoadedKextInfo(hArrKextIdRef, NULL /* all info */);
+                if (hLoadedKexts)
+                {
+                    if (CFDictionaryGetCount(hLoadedKexts) > 0)
+                    {
+                        hDictKext = (CFDictionaryRef)CFDictionaryGetValue(hLoadedKexts, hKextName);
+                        CFRetain(hDictKext);
+                    }
+
+                    CFRelease(hLoadedKexts);
+                }
+                CFRelease(hArrKextIdRef);
+            }
+            CFRelease(hKextName);
+        }
+    }
+
+    return hDictKext;
+}
+
+/**
+ * Destroy the given kernel module information record.
+ *
+ * @returns nothing.
+ * @param   pThis            The record to destroy.
+ */
+static void rtKrnlModInfoDestroy(PRTKRNLMODINFOINT pThis)
+{
+    CFRelease(pThis->hDictKext);
+    RTMemFree(pThis);
+}
+
+
+RTDECL(int) RTKrnlModQueryLoaded(const char *pszName, bool *pfLoaded)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertPtrReturn(pfLoaded, VERR_INVALID_POINTER);
+
+    CFDictionaryRef hDictKext = rtKrnlModDarwinGetKextInfoByName(pszName);
+    *pfLoaded = hDictKext != NULL;
+    if (hDictKext)
+        CFRelease(hDictKext);
+
+    return VINF_SUCCESS;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfo(const char *pszName, PRTKRNLMODINFO phKrnlModInfo)
+{
+    AssertPtrReturn(pszName, VERR_INVALID_POINTER);
+    AssertPtrReturn(phKrnlModInfo, VERR_INVALID_POINTER);
+
+    int rc = VINF_SUCCESS;
+    CFDictionaryRef hDictKext = rtKrnlModDarwinGetKextInfoByName(pszName);
+    if (hDictKext)
+    {
+        PRTKRNLMODINFOINT pThis = (PRTKRNLMODINFOINT)RTMemAllocZ(sizeof(RTKRNLMODINFOINT));
+        if (pThis)
+        {
+            pThis->cRefs     = 1;
+            pThis->hDictKext = hDictKext;
+
+            *phKrnlModInfo = pThis;
+        }
+        else
+            rc = VERR_NO_MEMORY;
+    }
+    else
+        rc = VERR_NOT_FOUND;
+
+    return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModLoadedGetCount(void)
+{
+    uint32_t cLoadedKexts = 0;
+    RTOnce(&g_GetIoKitApisOnce, rtKrnlModDarwinResolveIoKitApis, NULL);
+    if (g_pfnOSKextCopyLoadedKextInfo)
+    {
+        CFDictionaryRef hLoadedKexts = g_pfnOSKextCopyLoadedKextInfo(NULL, NULL /* all info */);
+        if (hLoadedKexts)
+        {
+            cLoadedKexts = CFDictionaryGetCount(hLoadedKexts);
+            CFRelease(hLoadedKexts);
+        }
+    }
+
+    return cLoadedKexts;
+}
+
+
+RTDECL(int) RTKrnlModLoadedQueryInfoAll(PRTKRNLMODINFO pahKrnlModInfo, uint32_t cEntriesMax,
+                                        uint32_t *pcEntries)
+{
+    AssertReturn(VALID_PTR(pahKrnlModInfo) || cEntriesMax == 0, VERR_INVALID_PARAMETER);
+
+    int rc = VINF_SUCCESS;
+    RTOnce(&g_GetIoKitApisOnce, rtKrnlModDarwinResolveIoKitApis, NULL);
+    if (g_pfnOSKextCopyLoadedKextInfo)
+    {
+        CFDictionaryRef hLoadedKexts = g_pfnOSKextCopyLoadedKextInfo(NULL, NULL /* all info */);
+        if (hLoadedKexts)
+        {
+            uint32_t cLoadedKexts = CFDictionaryGetCount(hLoadedKexts);
+            if (cLoadedKexts <= cEntriesMax)
+            {
+                CFDictionaryRef *pahDictKext = (CFDictionaryRef *)RTMemTmpAllocZ(cLoadedKexts * sizeof(CFDictionaryRef));
+                if (pahDictKext)
+                {
+                    CFDictionaryGetKeysAndValues(hLoadedKexts, NULL, (const void **)pahDictKext);
+                    for (uint32_t i = 0; i < cLoadedKexts; i++)
+                    {
+                        PRTKRNLMODINFOINT pThis = (PRTKRNLMODINFOINT)RTMemAllocZ(sizeof(RTKRNLMODINFOINT));
+                        if (RT_LIKELY(pThis))
+                        {
+                            pThis->cRefs = 1;
+                            pThis->hDictKext = pahDictKext[i];
+                            CFRetain(pThis->hDictKext);
+                            pahKrnlModInfo[i] = pThis;
+                        }
+                        else
+                        {
+                            rc = VERR_NO_MEMORY;
+                            /* Rollback. */
+                            while (i-- > 0)
+                            {
+                                CFRelease(pahKrnlModInfo[i]->hDictKext);
+                                RTMemFree(pahKrnlModInfo[i]);
+                            }
+                        }
+                    }
+
+                    if (   RT_SUCCESS(rc)
+                        && pcEntries)
+                        *pcEntries = cLoadedKexts;
+
+                    RTMemTmpFree(pahDictKext);
+                }
+                else
+                    rc = VERR_NO_MEMORY;
+            }
+            else
+            {
+                rc = VERR_BUFFER_OVERFLOW;
+
+                if (pcEntries)
+                    *pcEntries = cLoadedKexts;
+            }
+
+            CFRelease(hLoadedKexts);
+        }
+        else
+            rc = VERR_NOT_SUPPORTED;
+    }
+    else
+        rc = VERR_NOT_SUPPORTED;
+
+    return rc;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRetain(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
+    AssertMsg(cRefs > 1 && cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+    return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoRelease(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    if (!pThis)
+        return 0;
+    AssertPtrReturn(pThis, UINT32_MAX);
+
+    uint32_t cRefs = ASMAtomicDecU32(&pThis->cRefs);
+    AssertMsg(cRefs < _1M, ("%#x %p\n", cRefs, pThis));
+    if (cRefs == 0)
+        rtKrnlModInfoDestroy(pThis);
+    return cRefs;
+}
+
+
+RTDECL(uint32_t) RTKrnlModInfoGetRefCnt(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    uint32_t cRefCnt = 0;
+    CFNumberRef hRetainCnt = (CFNumberRef)CFDictionaryGetValue(pThis->hDictKext,
+                                                               kOSBundleRetainCountKey);
+    if (hRetainCnt)
+        CFNumberGetValue(hRetainCnt, kCFNumberSInt32Type, &cRefCnt);
+
+    return cRefCnt;
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetName(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, NULL);
+
+    const char *pszName = NULL;
+    CFStringRef hBundleId = (CFStringRef)CFDictionaryGetValue(pThis->hDictKext,
+                                                              kCFBundleIdentifierKey);
+    if (hBundleId)
+        pszName = CFStringGetCStringPtr(hBundleId, kCFStringEncodingUTF8);
+
+    return pszName;
+}
+
+
+RTDECL(const char *) RTKrnlModInfoGetFilePath(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, NULL);
+
+    return NULL;
+}
+
+
+RTDECL(size_t) RTKrnlModInfoGetSize(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    size_t cbKrnlMod = 0;
+    CFNumberRef hKrnlModSize = (CFNumberRef)CFDictionaryGetValue(pThis->hDictKext,
+                                                                 kOSBundleLoadSizeKey);
+    if (hKrnlModSize)
+    {
+        uint32_t cbTmp = 0;
+        CFNumberGetValue(hKrnlModSize, kCFNumberSInt32Type, &cbTmp);
+        cbKrnlMod = cbTmp;
+    }
+
+    return cbKrnlMod;
+}
+
+
+RTDECL(RTR0UINTPTR) RTKrnlModInfoGetLoadAddr(RTKRNLMODINFO hKrnlModInfo)
+{
+    PRTKRNLMODINFOINT pThis = hKrnlModInfo;
+    AssertPtrReturn(pThis, 0);
+
+    RTR0UINTPTR uKrnlModLoadAddr = 0;
+    CFNumberRef hKrnlModLoadAddr = (CFNumberRef)CFDictionaryGetValue(pThis->hDictKext,
+                                                                     kOSBundleLoadAddressKey);
+    if (hKrnlModLoadAddr)
+    {
+        uint64_t uAddrTmp = 0;
+        CFNumberGetValue(hKrnlModLoadAddr, kCFNumberSInt64Type, &uAddrTmp);
+        uKrnlModLoadAddr = uAddrTmp;
+    }
+
+    return uKrnlModLoadAddr;
+}
+
+
+RTDECL(int) RTKrnlModInfoQueryRefModInfo(RTKRNLMODINFO hKrnlModInfo, uint32_t idx,
+                                         PRTKRNLMODINFO phKrnlModInfoRef)
+{
+    RT_NOREF3(hKrnlModInfo, idx, phKrnlModInfoRef);
+    return VERR_NOT_IMPLEMENTED;
+}
diff --git a/src/VBox/Runtime/r3/darwin/mp-darwin.cpp b/src/VBox/Runtime/r3/darwin/mp-darwin.cpp
new file mode 100644
index 00000000..33d9b623
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/mp-darwin.cpp
@@ -0,0 +1,256 @@
+/* $Id: mp-darwin.cpp $ */
+/** @file
+ * IPRT - Multiprocessor, Darwin.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_SYSTEM
+#include <iprt/types.h>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <sys/sysctl.h>
+#include <sys/stat.h>
+#include <sys/fcntl.h>
+#include <errno.h>
+#include <mach/mach.h>
+
+#include <iprt/mp.h>
+#include <iprt/cpuset.h>
+#include <iprt/assert.h>
+#include <iprt/string.h>
+
+
+/**
+ * Internal worker that determines the max possible logical CPU count (hyperthreads).
+ *
+ * @returns Max cpus.
+ */
+static RTCPUID rtMpDarwinMaxLogicalCpus(void)
+{
+    int cCpus = -1;
+    size_t cb = sizeof(cCpus);
+    int rc = sysctlbyname("hw.logicalcpu_max", &cCpus, &cb, NULL, 0);
+    if (rc != -1 && cCpus >= 1)
+        return cCpus;
+    AssertFailed();
+    return 1;
+}
+
+/**
+ * Internal worker that determines the max possible physical core count.
+ *
+ * @returns Max cpus.
+ */
+static RTCPUID rtMpDarwinMaxPhysicalCpus(void)
+{
+    int cCpus = -1;
+    size_t cb = sizeof(cCpus);
+    int rc = sysctlbyname("hw.physicalcpu_max", &cCpus, &cb, NULL, 0);
+    if (rc != -1 && cCpus >= 1)
+        return cCpus;
+    AssertFailed();
+    return 1;
+}
+
+
+#if 0 /* unused */
+/**
+ * Internal worker that determines the current number of logical CPUs (hyperthreads).
+ *
+ * @returns Max cpus.
+ */
+static RTCPUID rtMpDarwinOnlineLogicalCpus(void)
+{
+    int cCpus = -1;
+    size_t cb = sizeof(cCpus);
+    int rc = sysctlbyname("hw.logicalcpu", &cCpus, &cb, NULL, 0);
+    if (rc != -1 && cCpus >= 1)
+        return cCpus;
+    AssertFailed();
+    return 1;
+}
+#endif /* unused */
+
+
+/**
+ * Internal worker that determines the current number of physical CPUs.
+ *
+ * @returns Max cpus.
+ */
+static RTCPUID rtMpDarwinOnlinePhysicalCpus(void)
+{
+    int cCpus = -1;
+    size_t cb = sizeof(cCpus);
+    int rc = sysctlbyname("hw.physicalcpu", &cCpus, &cb, NULL, 0);
+    if (rc != -1 && cCpus >= 1)
+        return cCpus;
+    AssertFailed();
+    return 1;
+}
+
+
+/** @todo RTmpCpuId(). */
+
+RTDECL(int) RTMpCpuIdToSetIndex(RTCPUID idCpu)
+{
+    return idCpu < RTCPUSET_MAX_CPUS && idCpu < rtMpDarwinMaxLogicalCpus() ? idCpu : -1;
+}
+
+
+RTDECL(RTCPUID) RTMpCpuIdFromSetIndex(int iCpu)
+{
+    return (unsigned)iCpu < rtMpDarwinMaxLogicalCpus() ? iCpu : NIL_RTCPUID;
+}
+
+
+RTDECL(RTCPUID) RTMpGetMaxCpuId(void)
+{
+    return rtMpDarwinMaxLogicalCpus() - 1;
+}
+
+
+RTDECL(bool) RTMpIsCpuOnline(RTCPUID idCpu)
+{
+#if 0
+    return RTMpIsCpuPossible(idCpu);
+#else
+    /** @todo proper ring-3 support on darwin, see @bugref{3014}. */
+    natural_t nCpus;
+    processor_basic_info_t pinfo;
+    mach_msg_type_number_t count;
+    kern_return_t krc = host_processor_info(mach_host_self(),
+        PROCESSOR_BASIC_INFO, &nCpus, (processor_info_array_t*)&pinfo, &count);
+    AssertReturn (krc == KERN_SUCCESS, true);
+    bool isOnline = idCpu < nCpus ? pinfo[idCpu].running : false;
+    vm_deallocate(mach_task_self(), (vm_address_t)pinfo, count * sizeof(*pinfo));
+    return isOnline;
+#endif
+}
+
+
+RTDECL(bool) RTMpIsCpuPossible(RTCPUID idCpu)
+{
+    return idCpu != NIL_RTCPUID
+        && idCpu < rtMpDarwinMaxLogicalCpus();
+}
+
+
+RTDECL(PRTCPUSET) RTMpGetSet(PRTCPUSET pSet)
+{
+#if 0
+    RTCPUID cCpus = rtMpDarwinMaxLogicalCpus();
+    return RTCpuSetFromU64(RT_BIT_64(cCpus) - 1);
+
+#else
+    RTCpuSetEmpty(pSet);
+    RTCPUID cMax = rtMpDarwinMaxLogicalCpus();
+    for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
+        if (RTMpIsCpuPossible(idCpu))
+            RTCpuSetAdd(pSet, idCpu);
+    return pSet;
+#endif
+}
+
+
+RTDECL(RTCPUID) RTMpGetCount(void)
+{
+    return rtMpDarwinMaxLogicalCpus();
+}
+
+
+RTDECL(RTCPUID) RTMpGetCoreCount(void)
+{
+    return rtMpDarwinMaxPhysicalCpus();
+}
+
+
+RTDECL(PRTCPUSET) RTMpGetOnlineSet(PRTCPUSET pSet)
+{
+#if 0
+    return RTMpGetSet(pSet);
+#else
+    RTCpuSetEmpty(pSet);
+    RTCPUID cMax = rtMpDarwinMaxLogicalCpus();
+    for (RTCPUID idCpu = 0; idCpu < cMax; idCpu++)
+        if (RTMpIsCpuOnline(idCpu))
+            RTCpuSetAdd(pSet, idCpu);
+    return pSet;
+#endif
+}
+
+
+RTDECL(RTCPUID) RTMpGetOnlineCount(void)
+{
+    RTCPUSET Set;
+    RTMpGetOnlineSet(&Set);
+    return RTCpuSetCount(&Set);
+}
+
+
+RTDECL(RTCPUID) RTMpGetOnlineCoreCount(void)
+{
+    return rtMpDarwinOnlinePhysicalCpus();
+}
+
+
+RTDECL(uint32_t) RTMpGetCurFrequency(RTCPUID idCpu)
+{
+    /** @todo figure out how to get the current cpu speed on darwin. Have to check what powermanagement does. */
+    NOREF(idCpu);
+    return 0;
+}
+
+
+RTDECL(uint32_t) RTMpGetMaxFrequency(RTCPUID idCpu)
+{
+    if (!RTMpIsCpuOnline(idCpu))
+        return 0;
+
+    /*
+     * Try the 'hw.cpufrequency_max' one.
+     */
+    uint64_t CpuFrequencyMax = 0;
+    size_t cb = sizeof(CpuFrequencyMax);
+    int rc = sysctlbyname("hw.cpufrequency_max", &CpuFrequencyMax, &cb, NULL, 0);
+    if (!rc)
+        return (CpuFrequencyMax + 999999) / 1000000;
+
+    /*
+     * Use the deprecated one.
+     */
+    int aiMib[2];
+    aiMib[0] = CTL_HW;
+    aiMib[1] = HW_CPU_FREQ;
+    int cCpus = -1;
+    cb = sizeof(cCpus);
+    rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
+    if (rc != -1 && cCpus >= 1)
+        return cCpus;
+    AssertFailed();
+    return 0;
+}
diff --git a/src/VBox/Runtime/r3/darwin/pathhost-darwin.cpp b/src/VBox/Runtime/r3/darwin/pathhost-darwin.cpp
new file mode 100644
index 00000000..6b2567db
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/pathhost-darwin.cpp
@@ -0,0 +1,107 @@
+/* $Id: pathhost-darwin.cpp $ */
+/** @file
+ * IPRT - Path Conversions, Darwin.
+ *
+ * On darwin path names on the disk are decomposed using normalization
+ * form D (NFD).  Since this behavior is unique for the Mac, we will precompose
+ * the path name strings we get from the XNU 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PATH
+#include <iprt/assert.h>
+#include <iprt/string.h>
+#include "internal/iprt.h"
+
+#include "internal/path.h"
+
+
+int rtPathToNative(const char **ppszNativePath, const char *pszPath, const char *pszBasePath)
+{
+    /** @todo We should decompose the string here, but the file system will do
+     *        that for us if we don't, so why bother. */
+    *ppszNativePath = (char *)pszPath;
+    NOREF(pszBasePath); /* We don't query the FS for codeset preferences. */
+    return VINF_SUCCESS;
+}
+
+
+void rtPathFreeNative(char const *pszNativePath, const char *pszPath)
+{
+    Assert(pszNativePath == pszPath || !pszNativePath);
+    NOREF(pszNativePath);
+    NOREF(pszPath);
+}
+
+
+int rtPathFromNative(char const **ppszPath, const char *pszNativePath, const char *pszBasePath)
+{
+    /** @todo We must compose the codepoints in the string here.  We get file names
+     *        in normalization form D so we'll end up with normalization form C
+     *        whatever approach we take. */
+    int rc = RTStrValidateEncodingEx(pszNativePath, RTSTR_MAX, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+        *ppszPath = pszNativePath;
+    else
+        *ppszPath = NULL;
+    NOREF(pszBasePath); /* We don't query the FS for codeset preferences. */
+    return rc;
+}
+
+
+void rtPathFreeIprt(const char *pszPath, const char *pszNativePath)
+{
+    Assert(pszPath == pszNativePath || !pszPath);
+    NOREF(pszPath); NOREF(pszNativePath);
+}
+
+
+int rtPathFromNativeCopy(char *pszPath, size_t cbPath, const char *pszNativePath, const char *pszBasePath)
+{
+    /** @todo We must compose the codepoints in the string here.  We get file names
+     *        in normalization form D so we'll end up with normalization form C
+     *        whatever approach we take. */
+    int rc = RTStrValidateEncodingEx(pszNativePath, RTSTR_MAX, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+        rc = RTStrCopyEx(pszPath, cbPath, pszNativePath, RTSTR_MAX);
+    NOREF(pszBasePath); /* We don't query the FS for codeset preferences. */
+    return rc;
+}
+
+
+int rtPathFromNativeDup(char **ppszPath, const char *pszNativePath, const char *pszBasePath)
+{
+    /** @todo We must compose the codepoints in the string here.  We get file names
+     *        in normalization form D so we'll end up with normalization form C
+     *        whatever approach we take. */
+    int rc = RTStrValidateEncodingEx(pszNativePath, RTSTR_MAX, 0 /*fFlags*/);
+    if (RT_SUCCESS(rc))
+        rc = RTStrDupEx(ppszPath, pszNativePath);
+    NOREF(pszBasePath); /* We don't query the FS for codeset preferences. */
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/rtProcInitExePath-darwin.cpp b/src/VBox/Runtime/r3/darwin/rtProcInitExePath-darwin.cpp
new file mode 100644
index 00000000..68a71541
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/rtProcInitExePath-darwin.cpp
@@ -0,0 +1,66 @@
+/* $Id: rtProcInitExePath-darwin.cpp $ */
+/** @file
+ * IPRT - rtProcInitName, Darwin.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_PROCESS
+#ifdef RT_OS_DARWIN
+# include <mach-o/dyld.h>
+#endif
+
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+#include <iprt/string.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/path.h>
+#include "internal/process.h"
+#include "internal/path.h"
+
+
+DECLHIDDEN(int) rtProcInitExePath(char *pszPath, size_t cchPath)
+{
+    /*
+     * Query the image name from the dynamic linker, convert and return it.
+     */
+    const char *pszImageName = _dyld_get_image_name(0);
+    AssertReturn(pszImageName, VERR_INTERNAL_ERROR);
+
+    char szTmpPath[PATH_MAX + 1];
+    const char *psz = realpath(pszImageName, szTmpPath);
+    int rc;
+    if (psz)
+        rc = rtPathFromNativeCopy(pszPath, cchPath, szTmpPath, NULL);
+    else
+        rc = RTErrConvertFromErrno(errno);
+    AssertMsgRCReturn(rc, ("rc=%Rrc pszLink=\"%s\"\nhex: %.*Rhxs\n", rc, pszPath, strlen(pszImageName), pszPath), rc);
+
+    return VINF_SUCCESS;
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/sched-darwin.cpp b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp
new file mode 100644
index 00000000..cefd1b28
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/sched-darwin.cpp
@@ -0,0 +1,353 @@
+/* $Id: sched-darwin.cpp $ */
+/** @file
+ * IPRT - Scheduling, Darwin.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_THREAD
+#include <mach/thread_act.h>
+#include <mach/thread_policy.h>
+#include <mach/thread_info.h>
+#include <mach/host_info.h>
+#include <mach/mach_init.h>
+#include <mach/mach_host.h>
+#include <sched.h>
+#include <pthread.h>
+#include <limits.h>
+#include <errno.h>
+
+#include <iprt/thread.h>
+#include <iprt/log.h>
+#include <iprt/assert.h>
+#include <iprt/errcore.h>
+#include <iprt/asm.h>
+#include <iprt/assert.h>
+#include "internal/sched.h"
+#include "internal/thread.h"
+
+
+/*********************************************************************************************************************************
+*   Structures and Typedefs                                                                                                      *
+*********************************************************************************************************************************/
+/**
+ * Configuration of one priority.
+ */
+typedef struct
+{
+    /** The priority. */
+    RTPROCPRIORITY  enmPriority;
+    /** The name of this priority. */
+    const char     *pszName;
+    /** Array scheduler attributes corresponding to each of the thread types. */
+    struct
+    {
+        /** For sanity include the array index. */
+        RTTHREADTYPE    enmType;
+        /** The desired mach base_priority value. */
+        int             iBasePriority;
+        /** The suggested priority value. (Same as iBasePriority seems to do the
+         *  trick.) */
+        int             iPriority;
+    } aTypes[RTTHREADTYPE_END];
+} PROCPRIORITY;
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/**
+ * Array of static priority configurations.
+ *
+ * ASSUMES that pthread_setschedparam takes a sched_priority argument in the
+ * range 0..127, which is translated into mach base_priority 0..63 and mach
+ * importance -31..32 (among other things). We also ASSUMES SCHED_OTHER.
+ *
+ * The base_priority range can be checked with tstDarwinSched, we're assuming it's
+ * 0..63 for user processes.
+ *
+ * Further we observe that fseventsd and mds both run at (mach) priority 50,
+ * while Finder runs at 47. At priority 63 we find the dynamic pager, the login
+ * window, UserEventAgent, SystemUIServer and coreaudiod. We do not wish to upset the
+ * dynamic pager, UI or audio, but we wish for I/O to not be bothered by spotlight
+ * (mds/fseventsd).
+ */
+static const PROCPRIORITY g_aPriorities[] =
+{
+    {
+        RTPROCPRIORITY_DEFAULT, "Default",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       29, 29 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       30, 30 },
+            { RTTHREADTYPE_EMULATION,               31, 31 }, /* the default priority */
+            { RTTHREADTYPE_DEFAULT,                 32, 32 },
+            { RTTHREADTYPE_GUI,                     32, 32 },
+            { RTTHREADTYPE_MAIN_WORKER,             32, 32 },
+            { RTTHREADTYPE_VRDP_IO,                 39, 39 },
+            { RTTHREADTYPE_DEBUGGER,                42, 42 },
+            { RTTHREADTYPE_MSG_PUMP,                47, 47 },
+            { RTTHREADTYPE_IO,                      52, 52 },
+            { RTTHREADTYPE_TIMER,                   55, 55 }
+        }
+    },
+    {
+        RTPROCPRIORITY_LOW, "Low",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       20, 20 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       22, 22 },
+            { RTTHREADTYPE_EMULATION,               24, 24 },
+            { RTTHREADTYPE_DEFAULT,                 28, 28 },
+            { RTTHREADTYPE_GUI,                     29, 29 },
+            { RTTHREADTYPE_MAIN_WORKER,             30, 30 },
+            { RTTHREADTYPE_VRDP_IO,                 31, 31 },
+            { RTTHREADTYPE_DEBUGGER,                31, 31 },
+            { RTTHREADTYPE_MSG_PUMP,                31, 31 },
+            { RTTHREADTYPE_IO,                      31, 31 },
+            { RTTHREADTYPE_TIMER,                   31, 31 }
+        }
+    },
+    {
+        RTPROCPRIORITY_NORMAL, "Normal",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       29, 29 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       30, 30 },
+            { RTTHREADTYPE_EMULATION,               31, 31 }, /* the default priority */
+            { RTTHREADTYPE_DEFAULT,                 32, 32 },
+            { RTTHREADTYPE_GUI,                     32, 32 },
+            { RTTHREADTYPE_MAIN_WORKER,             32, 32 },
+            { RTTHREADTYPE_VRDP_IO,                 39, 39 },
+            { RTTHREADTYPE_DEBUGGER,                42, 42 },
+            { RTTHREADTYPE_MSG_PUMP,                47, 47 },
+            { RTTHREADTYPE_IO,                      52, 52 },
+            { RTTHREADTYPE_TIMER,                   55, 55 }
+        }
+    },
+    {
+        RTPROCPRIORITY_HIGH, "High",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       30, 30 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       31, 31 },
+            { RTTHREADTYPE_EMULATION,               32, 32 },
+            { RTTHREADTYPE_DEFAULT,                 40, 40 },
+            { RTTHREADTYPE_GUI,                     41, 41 },
+            { RTTHREADTYPE_MAIN_WORKER,             43, 43 },
+            { RTTHREADTYPE_VRDP_IO,                 45, 45 },
+            { RTTHREADTYPE_DEBUGGER,                47, 47 },
+            { RTTHREADTYPE_MSG_PUMP,                49, 49 },
+            { RTTHREADTYPE_IO,                      57, 57 },
+            { RTTHREADTYPE_TIMER,                   61, 61 }
+        }
+    },
+    /* last */
+    {
+        RTPROCPRIORITY_FLAT, "Flat",
+        {
+            { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+            { RTTHREADTYPE_INFREQUENT_POLLER,       31, 31 },
+            { RTTHREADTYPE_MAIN_HEAVY_WORKER,       31, 31 },
+            { RTTHREADTYPE_EMULATION,               31, 31 },
+            { RTTHREADTYPE_DEFAULT,                 31, 31 },
+            { RTTHREADTYPE_GUI,                     31, 31 },
+            { RTTHREADTYPE_MAIN_WORKER,             31, 31 },
+            { RTTHREADTYPE_VRDP_IO,                 31, 31 },
+            { RTTHREADTYPE_DEBUGGER,                31, 31 },
+            { RTTHREADTYPE_MSG_PUMP,                31, 31 },
+            { RTTHREADTYPE_IO,                      31, 31 },
+            { RTTHREADTYPE_TIMER,                   31, 31 }
+        }
+    },
+};
+
+
+/**
+ * The dynamic default priority configuration.
+ *
+ * This can be recalulated at runtime depending on what the
+ * system allow us to do. Presently we don't do this as it seems
+ * Darwin generally lets us do whatever we want.
+ *
+ * @remarks this is the same as "Normal" above.
+ */
+static PROCPRIORITY g_aDefaultPriority =
+{
+    RTPROCPRIORITY_DEFAULT, "Default",
+    {
+        { RTTHREADTYPE_INVALID,                 INT_MIN, INT_MIN },
+        { RTTHREADTYPE_INFREQUENT_POLLER,       29, 29 },
+        { RTTHREADTYPE_MAIN_HEAVY_WORKER,       30, 30 },
+        { RTTHREADTYPE_EMULATION,               31, 31 }, /* the default priority */
+        { RTTHREADTYPE_DEFAULT,                 32, 32 },
+        { RTTHREADTYPE_GUI,                     32, 32 },
+        { RTTHREADTYPE_MAIN_WORKER,             32, 32 },
+        { RTTHREADTYPE_VRDP_IO,                 39, 39 },
+        { RTTHREADTYPE_DEBUGGER,                42, 42 },
+        { RTTHREADTYPE_MSG_PUMP,                47, 47 },
+        { RTTHREADTYPE_IO,                      52, 52 },
+        { RTTHREADTYPE_TIMER,                   55, 55 }
+    }
+};
+
+
+/** Pointer to the current priority configuration. */
+static const PROCPRIORITY *g_pProcessPriority = &g_aDefaultPriority;
+
+
+/**
+ * Get's the priority information for the current thread.
+ *
+ * @returns The base priority
+ * @param   pThread     The thread to get it for.  NULL for current.
+ */
+static int rtSchedDarwinGetBasePriority(PRTTHREADINT pThread)
+{
+    /* the base_priority. */
+    mach_msg_type_number_t       Count  = POLICY_TIMESHARE_INFO_COUNT;
+    struct policy_timeshare_info TSInfo = {0,0,0,0,0};
+    kern_return_t krc = thread_info(!pThread ? mach_thread_self() : pthread_mach_thread_np((pthread_t)pThread->Core.Key),
+                                    THREAD_SCHED_TIMESHARE_INFO, (thread_info_t)&TSInfo, &Count);
+    Assert(krc == KERN_SUCCESS); NOREF(krc);
+
+    return TSInfo.base_priority;
+}
+
+
+DECLHIDDEN(int) rtSchedNativeCalcDefaultPriority(RTTHREADTYPE enmType)
+{
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
+
+    /*
+     * Get the current priority.
+     */
+    int iBasePriority = rtSchedDarwinGetBasePriority(NULL);
+    Assert(iBasePriority >= 0 && iBasePriority <= 63);
+
+    /*
+     * If it doesn't match the default, select the closest one from the table.
+     */
+    int offBest = RT_ABS(g_pProcessPriority->aTypes[enmType].iBasePriority - iBasePriority);
+    if (offBest)
+    {
+        for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++)
+        {
+            int off = RT_ABS(g_aPriorities[i].aTypes[enmType].iBasePriority - iBasePriority);
+            if (off < offBest)
+            {
+                g_pProcessPriority = &g_aPriorities[i];
+                if (!off)
+                    break;
+                offBest = off;
+            }
+        }
+    }
+
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtProcNativeSetPriority(RTPROCPRIORITY enmPriority)
+{
+    Assert(enmPriority > RTPROCPRIORITY_INVALID && enmPriority < RTPROCPRIORITY_LAST);
+
+    /*
+     * No checks necessary, we assume we can set any priority in the user process range.
+     */
+    const PROCPRIORITY *pProcessPriority = &g_aDefaultPriority;
+    for (unsigned i = 0; i < RT_ELEMENTS(g_aPriorities); i++)
+        if (g_aPriorities[i].enmPriority == enmPriority)
+        {
+            pProcessPriority = &g_aPriorities[i];
+            break;
+        }
+    Assert(pProcessPriority != &g_aDefaultPriority);
+    ASMAtomicUoWritePtr(&g_pProcessPriority, pProcessPriority);
+
+    return VINF_SUCCESS;
+}
+
+
+DECLHIDDEN(int) rtThreadNativeSetPriority(PRTTHREADINT pThread, RTTHREADTYPE enmType)
+{
+    Assert(enmType > RTTHREADTYPE_INVALID && enmType < RTTHREADTYPE_END);
+    AssertMsg(g_pProcessPriority && g_pProcessPriority->aTypes[enmType].enmType == enmType,
+              ("enmType=%d entry=%d\n", enmType, g_pProcessPriority->aTypes[enmType].enmType));
+
+    /*
+     * Get the current policy and params first since there are
+     * opaque members in the param structure and we don't wish to
+     * change the policy.
+     */
+    int iSchedPolicy = SCHED_OTHER;
+    struct sched_param SchedParam = {0, {0,0,0,0} };
+    int err = pthread_getschedparam((pthread_t)pThread->Core.Key, &iSchedPolicy, &SchedParam);
+    if (!err)
+    {
+        int const iDesiredBasePriority = g_pProcessPriority->aTypes[enmType].iBasePriority;
+        int       iPriority            = g_pProcessPriority->aTypes[enmType].iPriority;
+
+        /*
+         * First try with the given pthread priority number.
+         * Then make adjustments in case we missed the desired base priority (interface
+         * changed or whatever - its using an obsolete mach api).
+         */
+        SchedParam.sched_priority = iPriority;
+        err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+        if (!err)
+        {
+            int i = 0;
+            int iBasePriority = rtSchedDarwinGetBasePriority(pThread);
+
+            while (   !err
+                   && iBasePriority < iDesiredBasePriority
+                   && i++ < 256)
+            {
+                SchedParam.sched_priority = ++iPriority;
+                err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+                iBasePriority = rtSchedDarwinGetBasePriority(pThread);
+            }
+
+            while (   !err
+                   && iPriority > 0
+                   && iBasePriority > iDesiredBasePriority
+                   && i++ < 256)
+            {
+                SchedParam.sched_priority = --iPriority;
+                err = pthread_setschedparam((pthread_t)pThread->Core.Key, iSchedPolicy, &SchedParam);
+                iBasePriority = rtSchedDarwinGetBasePriority(pThread);
+            }
+
+            return VINF_SUCCESS;
+        }
+    }
+    int rc = RTErrConvertFromErrno(err);
+    AssertMsgRC(rc, ("rc=%Rrc err=%d iSchedPolicy=%d sched_priority=%d\n",
+                     rc, err, iSchedPolicy, SchedParam.sched_priority));
+    return rc;
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/systemmem-darwin.cpp b/src/VBox/Runtime/r3/darwin/systemmem-darwin.cpp
new file mode 100644
index 00000000..eeb70451
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/systemmem-darwin.cpp
@@ -0,0 +1,86 @@
+/* $Id: systemmem-darwin.cpp $ */
+/** @file
+ * IPRT - RTSystemQueryTotalRam, darwin ring-3.
+ */
+
+/*
+ * Copyright (C) 2012-2020 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/system.h>
+#include "internal/iprt.h"
+
+#include <iprt/errcore.h>
+#include <iprt/assert.h>
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/sysctl.h>
+#include <sys/stat.h>
+#include <mach/mach.h>
+
+
+
+RTDECL(int) RTSystemQueryTotalRam(uint64_t *pcb)
+{
+    AssertPtrReturn(pcb, VERR_INVALID_POINTER);
+
+    int aiMib[2];
+    aiMib[0] = CTL_HW;
+    aiMib[1] = HW_MEMSIZE;
+    uint64_t    cbPhysMem = UINT64_MAX;
+    size_t      cb = sizeof(cbPhysMem);
+    int rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cbPhysMem, &cb, NULL, 0);
+    if (rc == 0)
+    {
+        *pcb = cbPhysMem;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromErrno(errno);
+}
+
+
+RTDECL(int) RTSystemQueryAvailableRam(uint64_t *pcb)
+{
+    AssertPtrReturn(pcb, VERR_INVALID_POINTER);
+
+    static mach_port_t volatile s_hSelfPort = 0;
+    mach_port_t hSelfPort = s_hSelfPort;
+    if (hSelfPort == 0)
+        s_hSelfPort = hSelfPort = mach_host_self();
+
+    vm_statistics_data_t    VmStats;
+    mach_msg_type_number_t  cItems = sizeof(VmStats) / sizeof(natural_t);
+
+    kern_return_t krc = host_statistics(hSelfPort, HOST_VM_INFO, (host_info_t)&VmStats, &cItems);
+    if (krc == KERN_SUCCESS)
+    {
+        uint64_t cPages = VmStats.inactive_count;
+        cPages += VmStats.free_count;
+        *pcb = cPages * PAGE_SIZE;
+        return VINF_SUCCESS;
+    }
+    return RTErrConvertFromDarwin(krc);
+}
+
diff --git a/src/VBox/Runtime/r3/darwin/time-darwin.cpp b/src/VBox/Runtime/r3/darwin/time-darwin.cpp
new file mode 100644
index 00000000..fc6b970f
--- /dev/null
+++ b/src/VBox/Runtime/r3/darwin/time-darwin.cpp
@@ -0,0 +1,115 @@
+/* $Id: time-darwin.cpp $ */
+/** @file
+ * IPRT - Time, Darwin.
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#define LOG_GROUP RTLOGGROUP_TIME
+#define RTTIME_INCL_TIMEVAL
+#include <mach/mach_time.h>
+#include <mach/kern_return.h>
+#include <sys/time.h>
+#include <time.h>
+
+#include <iprt/time.h>
+#include <iprt/assert.h>
+#include "internal/time.h"
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+static struct mach_timebase_info    g_Info = { 0, 0 };
+static double                       g_rdFactor = 0.0;
+static bool                         g_fFailedToGetTimeBaseInfo = false;
+
+
+/**
+ * Perform lazy init (pray we're not racing anyone in a bad way).
+ */
+static void rtTimeDarwinLazyInit(void)
+{
+    struct mach_timebase_info Info;
+    if (mach_timebase_info(&Info) == KERN_SUCCESS)
+    {
+        g_rdFactor = (double)Info.numer / (double)Info.denom;
+        g_Info = Info;
+    }
+    else
+    {
+        g_fFailedToGetTimeBaseInfo = true;
+        Assert(g_Info.denom == 0 && g_Info.numer == 0 && g_rdFactor == 0.0);
+    }
+}
+
+
+/**
+ * Internal worker.
+ * @returns Nanosecond timestamp.
+ */
+DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
+{
+    /* Lazy init. */
+    if (RT_UNLIKELY(g_Info.denom == 0 && !g_fFailedToGetTimeBaseInfo))
+        rtTimeDarwinLazyInit();
+
+    /* special case: absolute time is in nanoseconds */
+    if (g_Info.denom == 1 && g_Info.numer == 1)
+        return mach_absolute_time();
+
+    /* general case: multiply by factor to get nanoseconds. */
+    if (g_rdFactor != 0.0)
+        return mach_absolute_time() * g_rdFactor;
+
+    /* worst case: fallback to gettimeofday(). */
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return (uint64_t)tv.tv_sec  * RT_NS_1SEC_64
+         + (uint64_t)(tv.tv_usec * RT_NS_1US);
+}
+
+
+RTDECL(uint64_t) RTTimeSystemNanoTS(void)
+{
+    return rtTimeGetSystemNanoTS();
+}
+
+
+RTDECL(uint64_t) RTTimeSystemMilliTS(void)
+{
+    return rtTimeGetSystemNanoTS() / RT_NS_1MS;
+}
+
+
+RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
+{
+    /** @todo find nanosecond API for getting time of day. */
+    struct timeval tv;
+    gettimeofday(&tv, NULL);
+    return RTTimeSpecSetTimeval(pTime, &tv);
+}
+