C++ RT_LIKELY函数代码示例

/**
 * Patches the instructions necessary for making a hypercall to the hypervisor.
 * Used by GIM.
 *
 * @returns VBox status code.
 * @param   pVM         Pointer to the VM.
 * @param   pvBuf       The buffer in the hypercall page(s) to be patched.
 * @param   cbBuf       The size of the buffer.
 * @param   pcbWritten  Where to store the number of bytes patched. This
 *                      is reliably updated only when this function returns
 *                      VINF_SUCCESS.
 */
VMM_INT_DECL(int) VMMPatchHypercall(PVM pVM, void *pvBuf, size_t cbBuf, size_t *pcbWritten)
{
    AssertReturn(pvBuf, VERR_INVALID_POINTER);
    AssertReturn(pcbWritten, VERR_INVALID_POINTER);

    if (ASMIsAmdCpu())
    {
        uint8_t abHypercall[] = { 0x0F, 0x01, 0xD9 };   /* VMMCALL */
        if (RT_LIKELY(cbBuf >= sizeof(abHypercall)))
        {
            memcpy(pvBuf, abHypercall, sizeof(abHypercall));
            *pcbWritten = sizeof(abHypercall);
            return VINF_SUCCESS;
        }
        return VERR_BUFFER_OVERFLOW;
    }
    else
    {
        AssertReturn(ASMIsIntelCpu() || ASMIsViaCentaurCpu(), VERR_UNSUPPORTED_CPU);
        uint8_t abHypercall[] = { 0x0F, 0x01, 0xC1 };   /* VMCALL */
        if (RT_LIKELY(cbBuf >= sizeof(abHypercall)))
        {
            memcpy(pvBuf, abHypercall, sizeof(abHypercall));
            *pcbWritten = sizeof(abHypercall);
            return VINF_SUCCESS;
        }
        return VERR_BUFFER_OVERFLOW;
    }
}

/**
 * Registers client driver.
 *
 * @returns VBox status code.
 * @param   pszDevicePath       The device path of the client driver.
 * @param   Instance            The client driver instance.
 */
int VBoxUSBMonSolarisRegisterClient(dev_info_t *pClientDip, PVBOXUSB_CLIENT_INFO pClientInfo)
{
    LogFunc((DEVICE_NAME ":VBoxUSBMonSolarisRegisterClient pClientDip=%p pClientInfo=%p\n", pClientDip, pClientInfo));
    AssertPtrReturn(pClientInfo, VERR_INVALID_PARAMETER);

    if (RT_LIKELY(g_pDip))
    {
        vboxusbmon_client_t *pClient = RTMemAllocZ(sizeof(vboxusbmon_client_t));
        if (RT_LIKELY(pClient))
        {
            pClient->Info.Instance = pClientInfo->Instance;
            strncpy(pClient->Info.szClientPath, pClientInfo->szClientPath, sizeof(pClient->Info.szClientPath));
            strncpy(pClient->Info.szDeviceIdent, pClientInfo->szDeviceIdent, sizeof(pClient->Info.szDeviceIdent));
            pClient->Info.pfnSetConsumerCredentials = pClientInfo->pfnSetConsumerCredentials;
            pClient->pDip = pClientDip;

            mutex_enter(&g_VBoxUSBMonSolarisMtx);
            pClient->pNext = g_pVBoxUSBMonSolarisClients;
            g_pVBoxUSBMonSolarisClients = pClient;
            mutex_exit(&g_VBoxUSBMonSolarisMtx);

            Log((DEVICE_NAME ":VBoxUSBMonSolarisRegisterClient registered. %d %s %s\n",
                        pClient->Info.Instance, pClient->Info.szClientPath, pClient->Info.szDeviceIdent));

            return VINF_SUCCESS;
        }
        else
            return VERR_NO_MEMORY;
    }
    else
        return VERR_INVALID_STATE;
}

/**
 * Read the current CPU timestamp counter.
 *
 * @returns Gets the CPU tsc.
 * @param   pVCpu           The cross context virtual CPU structure.
 * @param   fCheckTimers    Whether to check timers.
 */
DECLINLINE(uint64_t) tmCpuTickGetInternal(PVMCPU pVCpu, bool fCheckTimers)
{
    uint64_t u64;

    if (RT_LIKELY(pVCpu->tm.s.fTSCTicking))
    {
        PVM pVM = pVCpu->CTX_SUFF(pVM);
        if (pVM->tm.s.enmTSCMode == TMTSCMODE_REAL_TSC_OFFSET)
            u64 = SUPReadTsc();
        else
            u64 = tmCpuTickGetRawVirtual(pVM, fCheckTimers);
        u64 -= pVCpu->tm.s.offTSCRawSrc;

        /* Always return a value higher than what the guest has already seen. */
        if (RT_LIKELY(u64 > pVCpu->tm.s.u64TSCLastSeen))
            pVCpu->tm.s.u64TSCLastSeen = u64;
        else
        {
            STAM_COUNTER_INC(&pVM->tm.s.StatTSCUnderflow);
            pVCpu->tm.s.u64TSCLastSeen += 64;   /** @todo choose a good increment here */
            u64 = pVCpu->tm.s.u64TSCLastSeen;
        }
    }
    else
        u64 = pVCpu->tm.s.u64TSC;
    return u64;
}

/**
 * Virtio Net private data allocation routine.
 *
 * @param pDevice           Pointer to the Virtio device instance.
 *
 * @return Allocated private data that must only be freed by calling
 *         VirtioNetDevFree().
 */
static void *VirtioNetDevAlloc(PVIRTIODEVICE pDevice)
{
    LogFlowFunc((VIRTIOLOGNAME ":VirtioNetDevAlloc pDevice=%p\n", pDevice));

    AssertReturn(pDevice, NULL);
    virtio_net_t *pNet = RTMemAllocZ(sizeof(virtio_net_t));
    if (RT_LIKELY(pNet))
    {
        /*
         * Create a kernel memory cache for frequently allocated/deallocated
         * buffers.
         */
        char szCachename[KSTAT_STRLEN];
        RTStrPrintf(szCachename, sizeof(szCachename), "VirtioNet_Cache_%d", ddi_get_instance(pDevice->pDip));
        pNet->pTxCache = kmem_cache_create(szCachename,                /* Cache name */
                                           sizeof(virtio_net_txbuf_t), /* Size of buffers in cache */
                                           0,                          /* Align */
                                           VirtioNetTxBufCreate,       /* Buffer constructor */
                                           VirtioNetTxBufDestroy,      /* Buffer destructor */
                                           NULL,                       /* pfnReclaim */
                                           pDevice,                    /* Private data */
                                           NULL,                       /* "vmp", MBZ (man page) */
                                           0                           /* "cflags", MBZ (man page) */
                                           );
        if (RT_LIKELY(pNet->pTxCache))
            return pNet;
        else
            LogRel((VIRTIOLOGNAME ":kmem_cache_create failed.\n"));
    }
    else
        LogRel((VIRTIOLOGNAME ":failed to alloc %u bytes for Net instance.\n", sizeof(virtio_net_t)));

    return NULL;
}

/**
 * Gets the next deadline in host CPU clock ticks and the TSC offset if we can
 * use the raw TSC.
 *
 * @returns The number of host CPU clock ticks to the next timer deadline.
 * @param   pVCpu           The current CPU.
 * @param   poffRealTSC     The offset against the TSC of the current CPU.
 * @thread  EMT(pVCpu).
 * @remarks Superset of TMCpuTickCanUseRealTSC.
 */
VMM_INT_DECL(uint64_t) TMCpuTickGetDeadlineAndTscOffset(PVMCPU pVCpu, bool *pfOffsettedTsc, uint64_t *poffRealTSC)
{
    PVM         pVM = pVCpu->CTX_SUFF(pVM);
    uint64_t    cTicksToDeadline;

    /*
     * We require:
     *     1. A fixed TSC, this is checked at init time.
     *     2. That the TSC is ticking (we shouldn't be here if it isn't)
     *     3. Either that we're using the real TSC as time source or
     *          a) we don't have any lag to catch up, and
     *          b) the virtual sync clock hasn't been halted by an expired timer, and
     *          c) we're not using warp drive (accelerated virtual guest time).
     */
    if (    pVM->tm.s.fMaybeUseOffsettedHostTSC
        &&  RT_LIKELY(pVCpu->tm.s.fTSCTicking)
        &&  (   pVM->tm.s.fTSCUseRealTSC
             || (   !pVM->tm.s.fVirtualSyncCatchUp
                 && RT_LIKELY(pVM->tm.s.fVirtualSyncTicking)
                 && !pVM->tm.s.fVirtualWarpDrive))
       )
    {
        *pfOffsettedTsc = true;
        if (!pVM->tm.s.fTSCUseRealTSC)
        {
            /* The source is the timer synchronous virtual clock. */
            Assert(pVM->tm.s.fTSCVirtualized);

            uint64_t cNsToDeadline;
            uint64_t u64NowVirtSync = TMVirtualSyncGetWithDeadlineNoCheck(pVM, &cNsToDeadline);
            uint64_t u64Now = u64NowVirtSync != TMCLOCK_FREQ_VIRTUAL /* what's the use of this? */
                            ? ASMMultU64ByU32DivByU32(u64NowVirtSync, pVM->tm.s.cTSCTicksPerSecond, TMCLOCK_FREQ_VIRTUAL)
                            : u64NowVirtSync;
            u64Now -= pVCpu->tm.s.offTSCRawSrc;
            *poffRealTSC = u64Now - ASMReadTSC();
            cTicksToDeadline = tmCpuCalcTicksToDeadline(cNsToDeadline);
        }
        else
        {
            /* The source is the real TSC. */
            if (pVM->tm.s.fTSCVirtualized)
                *poffRealTSC = pVCpu->tm.s.offTSCRawSrc;
            else
                *poffRealTSC = 0;
            cTicksToDeadline = tmCpuCalcTicksToDeadline(TMVirtualSyncGetNsToDeadline(pVM));
        }
    }
    else
    {
#ifdef VBOX_WITH_STATISTICS
        tmCpuTickRecordOffsettedTscRefusal(pVM, pVCpu);
#endif
        *pfOffsettedTsc  = false;
        *poffRealTSC     = 0;
        cTicksToDeadline = tmCpuCalcTicksToDeadline(TMVirtualSyncGetNsToDeadline(pVM));
    }
    return cTicksToDeadline;
}

/**
 * Callback wrapper for single-CPU timers.
 *
 * @param    pvArg              Opaque pointer to the timer.
 *
 * @remarks This will be executed in interrupt context but only at the specified
 *          level i.e. CY_LOCK_LEVEL in our case. We -CANNOT- call into the
 *          cyclic subsystem here, neither should pfnTimer().
 */
static void rtTimerSolSingleCallbackWrapper(void *pvArg)
{
    PRTTIMER pTimer = (PRTTIMER)pvArg;
    AssertPtrReturnVoid(pTimer);
    Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
    Assert(!pTimer->fAllCpus);

    /* Make sure one-shots do not fire another time. */
    Assert(   !pTimer->fSuspended
           || pTimer->cNsInterval != 0);

    if (!pTimer->fSuspendedFromTimer)
    {
        /* Make sure we are firing on the right CPU. */
        Assert(   !pTimer->fSpecificCpu
               || pTimer->iCpu == RTMpCpuId());

        /* For one-shot, we may allow the callback to restart them. */
        if (pTimer->cNsInterval == 0)
            pTimer->fSuspendedFromTimer = true;

        /*
         * Perform the callout.
         */
        pTimer->u.Single.pActiveThread = curthread;

        uint64_t u64Tick = ++pTimer->u.Single.u64Tick;
        pTimer->pfnTimer(pTimer, pTimer->pvUser, u64Tick);

        pTimer->u.Single.pActiveThread = NULL;

        if (RT_LIKELY(!pTimer->fSuspendedFromTimer))
        {
            if (   !pTimer->fIntervalChanged
                || RT_UNLIKELY(pTimer->hCyclicId == CYCLIC_NONE))
                return;

            /*
             * The interval was changed, we need to set the expiration time
             * ourselves before returning.  This comes at a slight cost,
             * which is why we don't do it all the time.
             */
            if (pTimer->u.Single.nsNextTick)
                pTimer->u.Single.nsNextTick += ASMAtomicUoReadU64(&pTimer->cNsInterval);
            else
                pTimer->u.Single.nsNextTick = RTTimeSystemNanoTS() + ASMAtomicUoReadU64(&pTimer->cNsInterval);
            cyclic_reprogram(pTimer->hCyclicId, pTimer->u.Single.nsNextTick);
            return;
        }

        /*
         * The timer has been suspended, set expiration time to infinitiy.
         */
    }
    if (RT_LIKELY(pTimer->hCyclicId != CYCLIC_NONE))
        cyclic_reprogram(pTimer->hCyclicId, CY_INFINITY);
}

/**
 * Callback wrapper for Omni-CPU timers.
 *
 * @param    pvArg              Opaque pointer to the timer.
 *
 * @remarks This will be executed in interrupt context but only at the specified
 *          level i.e. CY_LOCK_LEVEL in our case. We -CANNOT- call into the
 *          cyclic subsystem here, neither should pfnTimer().
 */
static void rtTimerSolOmniCallbackWrapper(void *pvArg)
{
    PRTTIMER pTimer = (PRTTIMER)pvArg;
    AssertPtrReturnVoid(pTimer);
    Assert(!RTThreadPreemptIsEnabled(NIL_RTTHREAD));
    Assert(pTimer->fAllCpus);

    if (!pTimer->fSuspendedFromTimer)
    {
        /*
         * Perform the callout.
         */
        uint32_t const iCpu = CPU->cpu_id;

        pTimer->u.Omni.aPerCpu[iCpu].pActiveThread = curthread;
        uint64_t u64Tick = ++pTimer->u.Omni.aPerCpu[iCpu].u64Tick;

        pTimer->pfnTimer(pTimer, pTimer->pvUser, u64Tick);

        pTimer->u.Omni.aPerCpu[iCpu].pActiveThread = NULL;

        if (RT_LIKELY(!pTimer->fSuspendedFromTimer))
        {
            if (   !pTimer->fIntervalChanged
                || RT_UNLIKELY(pTimer->hCyclicId == CYCLIC_NONE))
                return;

            /*
             * The interval was changed, we need to set the expiration time
             * ourselves before returning.  This comes at a slight cost,
             * which is why we don't do it all the time.
             *
             * Note! The cyclic_reprogram call only affects the omni cyclic
             *       component for this CPU.
             */
            if (pTimer->u.Omni.aPerCpu[iCpu].nsNextTick)
                pTimer->u.Omni.aPerCpu[iCpu].nsNextTick += ASMAtomicUoReadU64(&pTimer->cNsInterval);
            else
                pTimer->u.Omni.aPerCpu[iCpu].nsNextTick = RTTimeSystemNanoTS() + ASMAtomicUoReadU64(&pTimer->cNsInterval);
            cyclic_reprogram(pTimer->hCyclicId, pTimer->u.Omni.aPerCpu[iCpu].nsNextTick);
            return;
        }

        /*
         * The timer has been suspended, set expiration time to infinitiy.
         */
    }
    if (RT_LIKELY(pTimer->hCyclicId != CYCLIC_NONE))
        cyclic_reprogram(pTimer->hCyclicId, CY_INFINITY);
}

/**
 * Internal worker for getting the GIP CPU array index for the calling CPU.
 *
 * @returns Index into SUPGLOBALINFOPAGE::aCPUs or UINT16_MAX.
 * @param   pGip    The GIP.
 */
DECLINLINE(uint16_t) supGetGipCpuIndex(PSUPGLOBALINFOPAGE pGip)
{
    uint16_t iGipCpu;
#ifdef IN_RING3
    if (pGip->fGetGipCpu & SUPGIPGETCPU_IDTR_LIMIT_MASK_MAX_SET_CPUS)
    {
        /* Storing the IDTR is normally very fast. */
        uint16_t cbLim = ASMGetIdtrLimit();
        uint16_t iCpuSet = cbLim - 256 * (ARCH_BITS == 64 ? 16 : 8);
        iCpuSet  &= RTCPUSET_MAX_CPUS - 1;
        iGipCpu   = pGip->aiCpuFromCpuSetIdx[iCpuSet];
    }
    else if (pGip->fGetGipCpu & SUPGIPGETCPU_RDTSCP_MASK_MAX_SET_CPUS)
    {
        /* RDTSCP gives us what need need and more. */
        uint32_t iCpuSet;
        ASMReadTscWithAux(&iCpuSet);
        iCpuSet  &= RTCPUSET_MAX_CPUS - 1;
        iGipCpu   = pGip->aiCpuFromCpuSetIdx[iCpuSet];
    }
    else
    {
        /* Get APIC ID via the slow CPUID instruction. */
        uint8_t idApic = ASMGetApicId();
        iGipCpu = pGip->aiCpuFromApicId[idApic];
    }
#elif defined(IN_RING0)
    /* Ring-0: Use use RTMpCpuId() (disables cli to avoid host OS assertions about unsafe CPU number usage). */
    RTCCUINTREG uFlags  = ASMIntDisableFlags();
    int         iCpuSet = RTMpCpuIdToSetIndex(RTMpCpuId());
    if (RT_LIKELY((unsigned)iCpuSet < RT_ELEMENTS(pGip->aiCpuFromCpuSetIdx)))
        iGipCpu = pGip->aiCpuFromCpuSetIdx[iCpuSet];
    else
        iGipCpu = UINT16_MAX;
    ASMSetFlags(uFlags);

# elif defined(IN_RC)
    /* Raw-mode context: We can get the host CPU set index via VMCPU. */
    uint32_t    iCpuSet = VMMGetCpu(&g_VM)->iHostCpuSet;
    if (RT_LIKELY(iCpuSet < RT_ELEMENTS(pGip->aiCpuFromCpuSetIdx)))
        iGipCpu = pGip->aiCpuFromCpuSetIdx[iCpuSet];
    else
        iGipCpu = UINT16_MAX;
#else
# error "IN_RING3, IN_RC or IN_RING0 must be defined!"
#endif
    return iGipCpu;
}

RTDECL(int)  RTSemEventSignal(RTSEMEVENT hEventSem)
{
    /*
     * Validate input.
     */
    struct RTSEMEVENTINTERNAL *pThis = hEventSem;
    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
    AssertReturn(pThis->iMagic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);

#ifdef RTSEMEVENT_STRICT
    if (pThis->fEverHadSignallers)
    {
        int rc9 = RTLockValidatorRecSharedCheckSignaller(&pThis->Signallers, NIL_RTTHREAD);
        if (RT_FAILURE(rc9))
            return rc9;
    }
#endif

    ASMAtomicWriteU32(&pThis->fSignalled, 1);
    if (ASMAtomicReadS32(&pThis->cWaiters) < 1)
        return VINF_SUCCESS;

    /* somebody is waiting, try wake up one of them. */
    long cWoken = sys_futex(&pThis->fSignalled, FUTEX_WAKE, 1, NULL, NULL, 0);
    if (RT_LIKELY(cWoken >= 0))
        return VINF_SUCCESS;

    if (RT_UNLIKELY(pThis->iMagic != RTSEMEVENT_MAGIC))
        return VERR_SEM_DESTROYED;

    return VERR_INVALID_PARAMETER;
}

static int VBoxGuestSolarisPoll(dev_t Dev, short fEvents, int fAnyYet, short *pReqEvents, struct pollhead **ppPollHead)
{
    LogFlow((DEVICE_NAME "::Poll: fEvents=%d fAnyYet=%d\n", fEvents, fAnyYet));

    vboxguest_state_t *pState = ddi_get_soft_state(g_pVBoxGuestSolarisState, getminor(Dev));
    if (RT_LIKELY(pState))
    {
        PVBOXGUESTSESSION pSession  = (PVBOXGUESTSESSION)pState->pSession;
        uint32_t u32CurSeq = ASMAtomicUoReadU32(&g_DevExt.u32MousePosChangedSeq);
        if (pSession->u32MousePosChangedSeq != u32CurSeq)
        {
            *pReqEvents |= (POLLIN | POLLRDNORM);
            pSession->u32MousePosChangedSeq = u32CurSeq;
        }
        else
        {
            *pReqEvents = 0;
            if (!fAnyYet)
                *ppPollHead = &g_PollHead;
        }

        return 0;
    }
    else
    {
        Log((DEVICE_NAME "::Poll: no state data for %d\n", getminor(Dev)));
        return EINVAL;
    }
}

/**
 * A variant of Utf8Str::copyFromN that does not throw any exceptions but
 * returns E_OUTOFMEMORY instead.
 *
 * @param   a_pcszSrc   The source string.
 * @param   a_offSrc    Start offset to copy from.
 * @param   a_cchSrc    The source string.
 * @returns S_OK or E_OUTOFMEMORY.
 *
 * @remarks This calls cleanup() first, so the caller doesn't have to. (Saves
 *          code space.)
 */
HRESULT Utf8Str::copyFromExNComRC(const char *a_pcszSrc, size_t a_offSrc, size_t a_cchSrc)
{
    cleanup();
    if (a_cchSrc)
    {
        m_psz = RTStrAlloc(a_cchSrc + 1);
        if (RT_LIKELY(m_psz))
        {
            m_cch = a_cchSrc;
            m_cbAllocated = a_cchSrc + 1;
            memcpy(m_psz, a_pcszSrc + a_offSrc, a_cchSrc);
            m_psz[a_cchSrc] = '\0';
        }
        else
        {
            m_cch = 0;
            m_cbAllocated = 0;
            return E_OUTOFMEMORY;
        }
    }
    else
    {
        m_cch = 0;
        m_cbAllocated = 0;
        m_psz = NULL;
    }
    return S_OK;
}

RTDECL(int) RTFileAioCtxCreate(PRTFILEAIOCTX phAioCtx, uint32_t cAioReqsMax,
                               uint32_t fFlags)
{
    int rc = VINF_SUCCESS;
    PRTFILEAIOCTXINTERNAL pCtxInt;
    AssertPtrReturn(phAioCtx, VERR_INVALID_POINTER);
    AssertReturn(!(fFlags & ~RTFILEAIOCTX_FLAGS_VALID_MASK), VERR_INVALID_PARAMETER);

    pCtxInt = (PRTFILEAIOCTXINTERNAL)RTMemAllocZ(sizeof(RTFILEAIOCTXINTERNAL));
    if (RT_UNLIKELY(!pCtxInt))
        return VERR_NO_MEMORY;

    /* Init the event handle. */
    pCtxInt->iPort = port_create();
    if (RT_LIKELY(pCtxInt->iPort > 0))
    {
        pCtxInt->fFlags   = fFlags;
        pCtxInt->u32Magic = RTFILEAIOCTX_MAGIC;
        *phAioCtx = (RTFILEAIOCTX)pCtxInt;
    }
    else
    {
        RTMemFree(pCtxInt);
        rc = RTErrConvertFromErrno(errno);
    }

    return rc;
}

/**
 * Sets an irq on the PIC and I/O APIC.
 *
 * @returns true if delivered, false if postponed.
 * @param   pVM         Pointer to the VM.
 * @param   iIrq        The irq.
 * @param   iLevel      The new level.
 * @param   uTagSrc     The IRQ tag and source.
 *
 * @remarks The caller holds the PDM lock.
 */
static bool pdmR0IsaSetIrq(PVM pVM, int iIrq, int iLevel, uint32_t uTagSrc)
{
    if (RT_LIKELY(    (   pVM->pdm.s.IoApic.pDevInsR0
                       || !pVM->pdm.s.IoApic.pDevInsR3)
                  &&  (   pVM->pdm.s.Pic.pDevInsR0
                       || !pVM->pdm.s.Pic.pDevInsR3)))
    {
        if (pVM->pdm.s.Pic.pDevInsR0)
            pVM->pdm.s.Pic.pfnSetIrqR0(pVM->pdm.s.Pic.pDevInsR0, iIrq, iLevel, uTagSrc);
        if (pVM->pdm.s.IoApic.pDevInsR0)
            pVM->pdm.s.IoApic.pfnSetIrqR0(pVM->pdm.s.IoApic.pDevInsR0, iIrq, iLevel, uTagSrc);
        return true;
    }

    /* queue for ring-3 execution. */
    PPDMDEVHLPTASK pTask = (PPDMDEVHLPTASK)PDMQueueAlloc(pVM->pdm.s.pDevHlpQueueR0);
    AssertReturn(pTask, false);

    pTask->enmOp = PDMDEVHLPTASKOP_ISA_SET_IRQ;
    pTask->pDevInsR3 = NIL_RTR3PTR; /* not required */
    pTask->u.SetIRQ.iIrq = iIrq;
    pTask->u.SetIRQ.iLevel = iLevel;
    pTask->u.SetIRQ.uTagSrc = uTagSrc;

    PDMQueueInsertEx(pVM->pdm.s.pDevHlpQueueR0, &pTask->Core, 0);
    return false;
}

RTR0DECL(int) RTR0MemKernelCopyTo(void *pvDst, void const *pvSrc, size_t cb)
{
    int rc = kcopy(pvSrc, pvDst, cb);
    if (RT_LIKELY(rc == 0))
        return VINF_SUCCESS;
    return VERR_ACCESS_DENIED;
}

RTDECL(int) RTFileAioCtxCreate(PRTFILEAIOCTX phAioCtx, uint32_t cAioReqsMax)
{
    int rc = VINF_SUCCESS;
    PRTFILEAIOCTXINTERNAL pCtxInt;
    AssertPtrReturn(phAioCtx, VERR_INVALID_POINTER);

    pCtxInt = (PRTFILEAIOCTXINTERNAL)RTMemAllocZ(sizeof(RTFILEAIOCTXINTERNAL));
    if (RT_UNLIKELY(!pCtxInt))
        return VERR_NO_MEMORY;

    /* Init the event handle. */
    pCtxInt->iKQueue = kqueue();
    if (RT_LIKELY(pCtxInt->iKQueue > 0))
    {
        pCtxInt->u32Magic     = RTFILEAIOCTX_MAGIC;
        *phAioCtx = (RTFILEAIOCTX)pCtxInt;
    }
    else
    {
        RTMemFree(pCtxInt);
        rc = RTErrConvertFromErrno(errno);
    }

    return rc;
}