C++ RT_UNLIKELY函数代码示例

/**
 * @interface_method_impl{PDMINETWORKUP,pfnAllocBuf}
 */
PDMBOTHCBDECL(int) drvNetShaperUp_AllocBuf(PPDMINETWORKUP pInterface, size_t cbMin,
                                                  PCPDMNETWORKGSO pGso, PPPDMSCATTERGATHER ppSgBuf)
{
    PDRVNETSHAPER pThis = RT_FROM_MEMBER(pInterface, DRVNETSHAPER, CTX_SUFF(INetworkUp));
    if (RT_UNLIKELY(!pThis->CTX_SUFF(pIBelowNet)))
        return VERR_NET_DOWN;
    //LogFlow(("drvNetShaperUp_AllocBuf: cb=%d\n", cbMin));
    STAM_REL_COUNTER_ADD(&pThis->StatXmitBytesRequested, cbMin);
    STAM_REL_COUNTER_INC(&pThis->StatXmitPktsRequested);
#if defined(IN_RING3) || defined(IN_RING0)
    if (!PDMNsAllocateBandwidth(&pThis->Filter, cbMin))
    {
        STAM_REL_COUNTER_ADD(&pThis->StatXmitBytesDenied, cbMin);
        STAM_REL_COUNTER_INC(&pThis->StatXmitPktsDenied);
        return VERR_TRY_AGAIN;
    }
#endif
    STAM_REL_COUNTER_ADD(&pThis->StatXmitBytesGranted, cbMin);
    STAM_REL_COUNTER_INC(&pThis->StatXmitPktsGranted);
    //LogFlow(("drvNetShaperUp_AllocBuf: got cb=%d\n", cbMin));
    return pThis->CTX_SUFF(pIBelowNet)->pfnAllocBuf(pThis->CTX_SUFF(pIBelowNet), cbMin, pGso, ppSgBuf);
}

RTDECL(int) RTPoll(RTPOLLSET hPollSet, RTMSINTERVAL cMillies, uint32_t *pfEvents, uint32_t *pid)
{
    RTPOLLSETINTERNAL *pThis = hPollSet;
    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
    AssertReturn(pThis->u32Magic == RTPOLLSET_MAGIC, VERR_INVALID_HANDLE);
    AssertPtrNull(pfEvents);
    AssertPtrNull(pid);

    /*
     * Set the busy flag and do the job.
     */
    AssertReturn(ASMAtomicCmpXchgBool(&pThis->fBusy, true,  false), VERR_CONCURRENT_ACCESS);

    int rc;
    if (cMillies == RT_INDEFINITE_WAIT || cMillies == 0)
    {
        do rc = rtPollNoResumeWorker(pThis, cMillies, pfEvents, pid);
        while (rc == VERR_INTERRUPTED);
    }
    else
    {
        uint64_t MsStart = RTTimeMilliTS();
        rc = rtPollNoResumeWorker(pThis, cMillies, pfEvents, pid);
        while (RT_UNLIKELY(rc == VERR_INTERRUPTED))
        {
            if (RTTimeMilliTS() - MsStart >= cMillies)
            {
                rc = VERR_TIMEOUT;
                break;
            }
            rc = rtPollNoResumeWorker(pThis, cMillies, pfEvents, pid);
        }
    }

    ASMAtomicWriteBool(&pThis->fBusy, false);

    return rc;
}

void crUnpackDrawPixels(PCrUnpackerState pState)
{
    CHECK_BUFFER_SIZE_STATIC_LAST(pState, sizeof(int) + 20, GLint);

    GLsizei width  = READ_DATA(pState, sizeof( int ) + 0, GLsizei );
    GLsizei height = READ_DATA(pState, sizeof( int ) + 4, GLsizei );
    GLenum format  = READ_DATA(pState, sizeof( int ) + 8, GLenum );
    GLenum type    = READ_DATA(pState, sizeof( int ) + 12, GLenum );
    GLint noimagedata = READ_DATA(pState, sizeof( int ) + 16, GLint );
    GLvoid *pixels;

    if (noimagedata && !crStateIsBufferBound(pState->pStateTracker, GL_PIXEL_UNPACK_BUFFER_ARB))
        return;

    if (noimagedata)
        pixels = (void*) (uintptr_t) READ_DATA(pState, sizeof( int ) + 20, GLint);
    else
    {
        size_t cbImg = crImageSize( format, type, width, height );
        if (RT_UNLIKELY(cbImg == 0))
        {
            pState->rcUnpack = VERR_INVALID_PARAMETER;
            return;
        }

        pixels = DATA_POINTER(pState, sizeof( int ) + 24, GLvoid );
        CHECK_ARRAY_SIZE_FROM_PTR_UPDATE_LAST(pState, pixels, cbImg, GLubyte);
    }

    pState->pDispatchTbl->PixelStorei( GL_UNPACK_ROW_LENGTH, 0 );
    pState->pDispatchTbl->PixelStorei( GL_UNPACK_SKIP_PIXELS, 0 );
    pState->pDispatchTbl->PixelStorei( GL_UNPACK_SKIP_ROWS, 0 );
    pState->pDispatchTbl->PixelStorei( GL_UNPACK_ALIGNMENT, 1 );

    pState->pDispatchTbl->DrawPixels( width, height, format, type, pixels );

    INCR_VAR_PTR(pState);
}

/**
 * Updates Hyper-V's reference TSC page.
 *
 * @returns VBox status code.
 * @param   pVM         Pointer to the VM.
 * @param   u64Offset   The computed TSC offset.
 * @thread  EMT.
 */
VMM_INT_DECL(int) gimR0HvUpdateParavirtTsc(PVM pVM, uint64_t u64Offset)
{
    Assert(GIMIsEnabled(pVM));
    bool fHvTscEnabled = MSR_GIM_HV_REF_TSC_IS_ENABLED(pVM->gim.s.u.Hv.u64TscPageMsr);
    if (RT_UNLIKELY(!fHvTscEnabled))
        return VERR_GIM_PVTSC_NOT_ENABLED;

    PCGIMHV          pcHv     = &pVM->gim.s.u.Hv;
    PCGIMMMIO2REGION pcRegion = &pcHv->aMmio2Regions[GIM_HV_REF_TSC_PAGE_REGION_IDX];
    PGIMHVREFTSC     pRefTsc  = (PGIMHVREFTSC)pcRegion->CTX_SUFF(pvPage);
    Assert(pRefTsc);

    /*
     * Hyper-V reports the reference time in 100 nanosecond units.
     */
    uint64_t u64Tsc100Ns = TMCpuTicksPerSecond(pVM) / RT_NS_10MS;
    int64_t i64TscOffset = (int64_t)u64Offset / u64Tsc100Ns;

    /*
     * The TSC page can be simulatenously read by other VCPUs in the guest. The
     * spinlock is only for protecting simultaneous hypervisor writes from other
     * EMTs.
     */
    RTSpinlockAcquire(pcHv->hSpinlockR0);
    if (pRefTsc->i64TscOffset != i64TscOffset)
    {
        if (pRefTsc->u32TscSequence < UINT32_C(0xfffffffe))
            ASMAtomicIncU32(&pRefTsc->u32TscSequence);
        else
            ASMAtomicWriteU32(&pRefTsc->u32TscSequence, 1);
        ASMAtomicWriteS64(&pRefTsc->i64TscOffset, i64TscOffset);
    }
    RTSpinlockRelease(pcHv->hSpinlockR0);

    Assert(pRefTsc->u32TscSequence != 0);
    Assert(pRefTsc->u32TscSequence != UINT32_C(0xffffffff));
    return VINF_SUCCESS;
}

/**
 * Virtio Pci put queue routine. Places the queue and frees associated queue.
 *
 * @param pDevice           Pointer to the Virtio device instance.
 * @param pQueue            Pointer to the queue.
 */
static void VirtioPciPutQueue(PVIRTIODEVICE pDevice, PVIRTIOQUEUE pQueue)
{
    LogFlowFunc((VIRTIOLOGNAME ":VirtioPciPutQueue pDevice=%p pQueue=%p\n", pDevice, pQueue));
    AssertReturnVoid(pDevice);
    AssertReturnVoid(pQueue);

    virtio_pci_t *pPci = pDevice->pvHyper;
    AssertReturnVoid(pPci);
    virtio_pci_queue_t *pPciQueue = pQueue->pvData;
    if (RT_UNLIKELY(!pPciQueue))
    {
        LogRel((VIRTIOLOGNAME ":VirtioPciPutQueue missing Pci queue.\n"));
        return;
    }

    ddi_put16(pPci->hIO, (uint16_t *)(pPci->addrIOBase + VIRTIO_PCI_QUEUE_SEL), pQueue->QueueIndex);
    ddi_put32(pPci->hIO, (uint32_t *)(pPci->addrIOBase + VIRTIO_PCI_QUEUE_PFN), 0);

    ddi_dma_unbind_handle(pPciQueue->hDMA);
    ddi_dma_mem_free(&pPciQueue->hIO);
    ddi_dma_free_handle(&pPciQueue->hDMA);
    RTMemFree(pPciQueue);
}

int vbglR3GRAlloc(VMMDevRequestHeader **ppReq, uint32_t cb, VMMDevRequestType enmReqType)
{
    VMMDevRequestHeader *pReq;

    AssertPtrReturn(ppReq, VERR_INVALID_PARAMETER);
    AssertMsgReturn(cb >= sizeof(VMMDevRequestHeader), ("%#x vs %#zx\n", cb, sizeof(VMMDevRequestHeader)),
                    VERR_INVALID_PARAMETER);

    pReq = (VMMDevRequestHeader *)RTMemTmpAlloc(cb);
    if (RT_UNLIKELY(!pReq))
        return VERR_NO_MEMORY;

    pReq->size        = cb;
    pReq->version     = VMMDEV_REQUEST_HEADER_VERSION;
    pReq->requestType = enmReqType;
    pReq->rc          = VERR_GENERAL_FAILURE;
    pReq->reserved1   = 0;
    pReq->reserved2   = 0;

    *ppReq = pReq;

    return VINF_SUCCESS;
}

/**
 * @interface_method_impl{PDMIBASE,pfnWriteControl}
 */
static DECLCALLBACK(int) drvHostParallelWriteControl(PPDMIHOSTPARALLELCONNECTOR pInterface, uint8_t fReg)
{
    PDRVHOSTPARALLEL    pThis   = RT_FROM_MEMBER(pInterface, DRVHOSTPARALLEL, CTX_SUFF(IHostParallelConnector));
    int rc = VINF_SUCCESS;
    int rcLnx = 0;

    LogFlowFunc(("fReg=%#x\n", fReg));
# ifndef VBOX_WITH_WIN_PARPORT_SUP
    rcLnx = ioctl(RTFileToNative(pThis->hFileDevice), PPWCONTROL, &fReg);
    if (RT_UNLIKELY(rcLnx < 0))
        rc = RTErrConvertFromErrno(errno);
# else /* VBOX_WITH_WIN_PARPORT_SUP */
    uint64_t u64Data;
    u64Data = (uint8_t)fReg;
    if (pThis->fParportAvail)
    {
        LogFlowFunc(("calling R0 to write CTRL, data=%#x\n", u64Data));
        rc = PDMDrvHlpCallR0(pThis->CTX_SUFF(pDrvIns), DRVHOSTPARALLELR0OP_WRITECONTROL, u64Data);
        AssertRC(rc);
    }
# endif /* VBOX_WITH_WIN_PARPORT_SUP */
    return rc;
}

/**
 * Gets an entry.
 *
 * @returns IPRT status code.
 * @param   pThis               The manifest to work with.
 * @param   pszEntry            The entry name.
 * @param   fNeedNormalization  Whether rtManifestValidateNameEntry said it
 *                              needed normalization.
 * @param   cchEntry            The length of the name.
 * @param   ppEntry             Where to return the entry pointer on success.
 */
static int rtManifestGetEntry(RTMANIFESTINT *pThis, const char *pszEntry, bool fNeedNormalization, size_t cchEntry,
                              PRTMANIFESTENTRY *ppEntry)
{
    PRTMANIFESTENTRY pEntry;

    AssertCompileMemberOffset(RTMANIFESTATTR, StrCore, 0);
    if (!fNeedNormalization)
        pEntry = (PRTMANIFESTENTRY)RTStrSpaceGet(&pThis->Entries, pszEntry);
    else
    {
        char *pszCopy = (char *)RTMemTmpAlloc(cchEntry + 1);
        if (RT_UNLIKELY(!pszCopy))
            return VERR_NO_TMP_MEMORY;
        memcpy(pszCopy, pszEntry, cchEntry + 1);
        rtManifestNormalizeEntry(pszCopy);

        pEntry = (PRTMANIFESTENTRY)RTStrSpaceGet(&pThis->Entries, pszCopy);
        RTMemTmpFree(pszCopy);
    }

    *ppEntry = pEntry;
    return pEntry ? VINF_SUCCESS : VERR_NOT_FOUND;
}

/**
 * Reads one object ID component, returning it's value and encoded length.
 *
 * @returns The encoded length (positive) on success, negative IPRT status code
 *          on failure.
 * @param   pbContent           The start of the component to parse.
 * @param   cbContent           The number of content bytes left.
 * @param   puValue             Where to return the value.
 */
static int rtAsn1ObjId_ReadComponent(uint8_t const *pbContent, uint32_t cbContent, uint32_t *puValue)
{
    if (cbContent >= 1)
    {
        /* The first byte. */
        uint8_t b = *pbContent;
        if (!(b & 0x80))
        {
            *puValue = b;
            return 1;
        }

        /* Encoded as more than one byte.  Make sure that it's efficently
           encoded as 8.19.2 indicates it must. */
        if (b != 0x80)
        {
            uint32_t off    = 1;
            uint32_t uValue = b & 0x7f;
            while (off < cbContent)
            {
                b = pbContent[off++];
                uValue <<= 7;
                uValue |= b & 0x7f;
                if (!(b & 0x80))
                {
                    *puValue = uValue;
                    return (int)off;
                }

                if (RT_UNLIKELY(uValue & UINT32_C(0x0e000000)))
                    return VERR_ASN1_OBJID_COMPONENT_TOO_BIG;
            }
        }
        return VERR_ASN1_INVALID_OBJID_ENCODING;
    }
    return VERR_NO_DATA;
}

/**
 * Attach entry point, to attach a device to the system or resume it.
 *
 * @param   pDip            The module structure instance.
 * @param   enmCmd          Attach type (ddi_attach_cmd_t)
 *
 * @returns corresponding solaris error code.
 */
static int VBoxUSBMonSolarisAttach(dev_info_t *pDip, ddi_attach_cmd_t enmCmd)
{
    LogFunc((DEVICE_NAME ":VBoxUSBMonSolarisAttach pDip=%p enmCmd=%d\n", pDip, enmCmd));
    switch (enmCmd)
    {
        case DDI_ATTACH:
        {
            if (RT_UNLIKELY(g_pDip))
            {
                LogRel((DEVICE_NAME ":VBoxUSBMonSolarisAttach global instance already initialized.\n"));
                return DDI_FAILURE;
            }

            g_pDip = pDip;
            int instance = ddi_get_instance(pDip);
            int rc = ddi_create_priv_minor_node(pDip, DEVICE_NAME, S_IFCHR, instance, DDI_PSEUDO, 0,
                                                        "none", "none", 0660);
            if (rc == DDI_SUCCESS)
            {
                ddi_report_dev(pDip);
                return rc;
            }
            else
                LogRel((DEVICE_NAME ":VBoxUSBMonSolarisAttach ddi_create_minor_node failed! rc=%d\n", rc));
            return DDI_FAILURE;
        }

        case DDI_RESUME:
        {
            /* We don't have to bother about power management. */
            return DDI_SUCCESS;
        }

        default:
            return DDI_FAILURE;
    }
}

/**
 * Physical access handler for MMIO ranges.
 *
 * @returns VBox status code (appropriate for GC return).
 * @param   pVM         The cross context VM structure.
 * @param   pVCpu       The cross context virtual CPU structure of the calling EMT.
 * @param   uErrorCode  CPU Error code.
 * @param   pCtxCore    Trap register frame.
 * @param   GCPhysFault The GC physical address.
 */
VMMDECL(VBOXSTRICTRC) IOMMMIOPhysHandler(PVM pVM, PVMCPU pVCpu, RTGCUINT uErrorCode, PCPUMCTXCORE pCtxCore, RTGCPHYS GCPhysFault)
{
    /*
     * We don't have a range here, so look it up before calling the common function.
     */
    int rc2 = IOM_LOCK_SHARED(pVM); NOREF(rc2);
#ifndef IN_RING3
    if (rc2 == VERR_SEM_BUSY)
        return VINF_IOM_R3_MMIO_READ_WRITE;
#endif
    PIOMMMIORANGE pRange = iomMmioGetRange(pVM, pVCpu, GCPhysFault);
    if (RT_UNLIKELY(!pRange))
    {
        IOM_UNLOCK_SHARED(pVM);
        return VERR_IOM_MMIO_RANGE_NOT_FOUND;
    }
    iomMmioRetainRange(pRange);
    IOM_UNLOCK_SHARED(pVM);

    VBOXSTRICTRC rcStrict = iomMmioCommonPfHandler(pVM, pVCpu, (uint32_t)uErrorCode, pCtxCore, GCPhysFault, pRange);

    iomMmioReleaseRange(pVM, pRange);
    return VBOXSTRICTRC_VAL(rcStrict);
}

/**
 * The client driver IOCtl Wrapper function.
 *
 * @returns VBox status code.
 * @param   pDevSol         The Solaris device instance.
 * @param   Function        The Function.
 * @param   pvData          Opaque pointer to the data.
 * @param   cbData          Size of the data pointed to by pvData.
 */
static int usbProxySolarisIOCtl(PUSBPROXYDEVSOL pDevSol, unsigned Function, void *pvData, size_t cbData)
{
    if (RT_UNLIKELY(pDevSol->hFile == NIL_RTFILE))
    {
        LogFlow((USBPROXY ":usbProxySolarisIOCtl connection to driver gone!\n"));
        return VERR_VUSB_DEVICE_NOT_ATTACHED;
    }

    VBOXUSBREQ Req;
    Req.u32Magic = VBOXUSB_MAGIC;
    Req.rc = -1;
    Req.cbData = cbData;
    Req.pvDataR3 = pvData;

    int Ret = -1;
    int rc = RTFileIoCtl(pDevSol->hFile, Function, &Req, sizeof(Req), &Ret);
    if (RT_SUCCESS(rc))
    {
        if (RT_FAILURE(Req.rc))
        {
            if (Req.rc == VERR_VUSB_DEVICE_NOT_ATTACHED)
            {
                pDevSol->pProxyDev->fDetached = true;
                usbProxySolarisCloseFile(pDevSol);
                LogRel((USBPROXY ":Command %#x failed, USB Device '%s' disconnected!\n", Function, pDevSol->pProxyDev->pUsbIns->pszName));
            }
            else
                LogRel((USBPROXY ":Command %#x failed. Req.rc=%Rrc\n", Function, Req.rc));
        }

        return Req.rc;
    }

    LogRel((USBPROXY ":Function %#x failed. rc=%Rrc\n", Function, rc));
    return rc;
}

/**
 * Write a character to the stream.
 *
 * @returns IPRT status code
 * @param   pStream             The stream.  Must be in write mode.
 * @param   pchBuf              What to write.
 * @param   cchBuf              How much to write.
 */
int ScmStreamPutCh(PSCMSTREAM pStream, char ch)
{
    AssertReturn(pStream->fWriteOrRead, VERR_ACCESS_DENIED);
    if (RT_FAILURE(pStream->rc))
        return pStream->rc;

    /*
     * Only deal with the simple cases here, use ScmStreamWrite for the
     * annoying stuff.
     */
    size_t off = pStream->off;
    if (   ch == '\n'
        || RT_UNLIKELY(off + 1 > pStream->cbAllocated))
        return ScmStreamWrite(pStream, &ch, 1);

    /*
     * Just append it.
     */
    pStream->pch[off] = ch;
    pStream->off = off + 1;
    pStream->paLines[pStream->iLine].cch++;

    return VINF_SUCCESS;
}

DECL_FORCE_INLINE(int) rtSemMutexRequest(RTSEMMUTEX hMutexSem, RTMSINTERVAL cMillies, bool fAutoResume, PCRTLOCKVALSRCPOS pSrcPos)
{
    /*
     * Validate input.
     */
    struct RTSEMMUTEXINTERNAL *pThis = hMutexSem;
    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
    AssertReturn(pThis->u32Magic == RTSEMMUTEX_MAGIC, VERR_INVALID_HANDLE);

    /*
     * Check if nested request.
     */
    pthread_t Self = pthread_self();
    if (    pThis->Owner == Self
            &&  pThis->cNestings > 0)
    {
#ifdef RTSEMMUTEX_STRICT
        int rc9 = RTLockValidatorRecExclRecursion(&pThis->ValidatorRec, pSrcPos);
        if (RT_FAILURE(rc9))
            return rc9;
#endif
        ASMAtomicIncU32(&pThis->cNestings);
        return VINF_SUCCESS;
    }

#ifdef RTSEMMUTEX_STRICT
    RTTHREAD hThreadSelf = RTThreadSelfAutoAdopt();
    if (cMillies)
    {
        int rc9 = RTLockValidatorRecExclCheckOrder(&pThis->ValidatorRec, hThreadSelf, pSrcPos, cMillies);
        if (RT_FAILURE(rc9))
            return rc9;
    }
#else
    RTTHREAD hThreadSelf = RTThreadSelf();
#endif

    /*
     * Convert timeout value.
     */
    struct timespec ts;
    struct timespec *pTimeout = NULL;
    uint64_t u64End = 0; /* shut up gcc */
    if (cMillies != RT_INDEFINITE_WAIT)
    {
        ts.tv_sec  = cMillies / 1000;
        ts.tv_nsec = (cMillies % 1000) * UINT32_C(1000000);
        u64End = RTTimeSystemNanoTS() + cMillies * UINT64_C(1000000);
        pTimeout = &ts;
    }

    /*
     * Lock the mutex.
     * Optimize for the uncontended case (makes 1-2 ns difference).
     */
    if (RT_UNLIKELY(!ASMAtomicCmpXchgS32(&pThis->iState, 1, 0)))
    {
        for (;;)
        {
            int32_t iOld = ASMAtomicXchgS32(&pThis->iState, 2);

            /*
             * Was the lock released in the meantime? This is unlikely (but possible)
             */
            if (RT_UNLIKELY(iOld == 0))
                break;

            /*
             * Go to sleep.
             */
            if (pTimeout && ( pTimeout->tv_sec || pTimeout->tv_nsec ))
            {
#ifdef RTSEMMUTEX_STRICT
                int rc9 = RTLockValidatorRecExclCheckBlocking(&pThis->ValidatorRec, hThreadSelf, pSrcPos, true,
                          cMillies, RTTHREADSTATE_MUTEX, true);
                if (RT_FAILURE(rc9))
                    return rc9;
#else
                RTThreadBlocking(hThreadSelf, RTTHREADSTATE_MUTEX, true);
#endif
            }

            long rc = sys_futex(&pThis->iState, FUTEX_WAIT, 2, pTimeout, NULL, 0);

            RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_MUTEX);
            if (RT_UNLIKELY(pThis->u32Magic != RTSEMMUTEX_MAGIC))
                return VERR_SEM_DESTROYED;

            /*
             * Act on the wakup code.
             */
            if (rc == -ETIMEDOUT)
            {
                Assert(pTimeout);
                return VERR_TIMEOUT;
            }
            if (rc == 0)
                /* we'll leave the loop now unless another thread is faster */;
            else if (rc == -EWOULDBLOCK)
                /* retry with new value. */;
//.........这里部分代码省略.........

int main(int argc, char **argv)
{
    int rcRet = 0;
    int i;
    int rc;
    int cIterations = argc > 1 ? RTStrToUInt32(argv[1]) : 32;
    if (cIterations == 0)
        cIterations = 64;

    /*
     * Init.
     */
    RTR3InitExe(argc, &argv, 0);
    PSUPDRVSESSION pSession;
    rc = SUPR3Init(&pSession);
    rcRet += rc != 0;
    RTPrintf("tstInt: SUPR3Init -> rc=%Rrc\n", rc);
    char szFile[RTPATH_MAX];
    if (!rc)
    {
        rc = RTPathExecDir(szFile, sizeof(szFile) - sizeof("/VMMR0.r0"));
    }
    char szAbsFile[RTPATH_MAX];
    if (RT_SUCCESS(rc))
    {
        strcat(szFile, "/VMMR0.r0");
        rc = RTPathAbs(szFile, szAbsFile, sizeof(szAbsFile));
    }
    if (RT_SUCCESS(rc))
    {
        /*
         * Load VMM code.
         */
        rc = SUPR3LoadVMM(szAbsFile);
        if (RT_SUCCESS(rc))
        {
            /*
             * Create a fake 'VM'.
             */
            PVMR0 pVMR0 = NIL_RTR0PTR;
            PVM pVM = NULL;
            const unsigned cPages = RT_ALIGN_Z(sizeof(*pVM), PAGE_SIZE) >> PAGE_SHIFT;
            PSUPPAGE paPages = (PSUPPAGE)RTMemAllocZ(cPages * sizeof(SUPPAGE));
            if (paPages)
                rc = SUPR3LowAlloc(cPages, (void **)&pVM, &pVMR0, &paPages[0]);
            else
                rc = VERR_NO_MEMORY;
            if (RT_SUCCESS(rc))
            {
                pVM->pVMRC = 0;
                pVM->pVMR3 = pVM;
                pVM->pVMR0 = pVMR0;
                pVM->paVMPagesR3 = paPages;
                pVM->pSession = pSession;
                pVM->enmVMState = VMSTATE_CREATED;

                rc = SUPR3SetVMForFastIOCtl(pVMR0);
                if (!rc)
                {

                    /*
                     * Call VMM code with invalid function.
                     */
                    for (i = cIterations; i > 0; i--)
                    {
                        rc = SUPR3CallVMMR0(pVMR0, NIL_VMCPUID, VMMR0_DO_SLOW_NOP, NULL);
                        if (rc != VINF_SUCCESS)
                        {
                            RTPrintf("tstInt: SUPR3CallVMMR0 -> rc=%Rrc i=%d Expected VINF_SUCCESS!\n", rc, i);
                            rcRet++;
                            break;
                        }
                    }
                    RTPrintf("tstInt: Performed SUPR3CallVMMR0 %d times (rc=%Rrc)\n", cIterations, rc);

                    /*
                     * The fast path.
                     */
                    if (rc == VINF_SUCCESS)
                    {
                        RTTimeNanoTS();
                        uint64_t StartTS = RTTimeNanoTS();
                        uint64_t StartTick = ASMReadTSC();
                        uint64_t MinTicks = UINT64_MAX;
                        for (i = 0; i < 1000000; i++)
                        {
                            uint64_t OneStartTick = ASMReadTSC();
                            rc = SUPR3CallVMMR0Fast(pVMR0, VMMR0_DO_NOP, 0);
                            uint64_t Ticks = ASMReadTSC() - OneStartTick;
                            if (Ticks < MinTicks)
                                MinTicks = Ticks;

                            if (RT_UNLIKELY(rc != VINF_SUCCESS))
                            {
                                RTPrintf("tstInt: SUPR3CallVMMR0Fast -> rc=%Rrc i=%d Expected VINF_SUCCESS!\n", rc, i);
                                rcRet++;
                                break;
                            }
                        }
                        uint64_t Ticks = ASMReadTSC() - StartTick;
//.........这里部分代码省略.........