DrvEnableDriver

//
// @1. 返回支持的DDI版本号
// @2. 返回回调函数接口
//
/* Display Driver entry point,
 * Returns DDI version number and callbacks supported by driver.
 */
BOOL DrvEnableDriver(ULONG iEngineVersion, ULONG cj, PDRVENABLEDATA pded)
{
    /*@todo: can't link with hal.lib
    int irc = RTR0Init(0);
    if (RT_FAILURE(irc))
    {
        LOGREL(("failed to init IPRT (rc=%#x)", irc));
        return FALSE;
    }
    */

    LOGF(("iEngineVersion=%#08X, cj=%d", iEngineVersion, cj));

    g_EngineVersionDDI = iEngineVersion;

    /* Driver can't work if we can't fill atleast first 3 fields in passed PDRVENABLEDATA */
    if (cj < (2*sizeof(ULONG)+sizeof(DRVFN*)))
    {
        WARN(("cj<%d, terminating\n", sizeof(DRVENABLEDATA)));
        return FALSE;
    }

    /* Report driver DDI version and appropriate callbacks table based on engine DDI */
    if (iEngineVersion>=DDI_DRIVER_VERSION_NT5)
    {
// @1. 返回支持的DDI版本号
        /* WIN2K and above */
        pded->iDriverVersion = DDI_DRIVER_VERSION_NT5;
// @2. 返回回调函数接口
        pded->pdrvfn = g_aDrvFnTableNT5;
        pded->c = RT_ELEMENTS(g_aDrvFnTableNT5);
    }
    else
    {
        /* NT4_SP3 and below*/
        pded->iDriverVersion = DDI_DRIVER_VERSION_NT4;
        pded->pdrvfn = g_aDrvFnTableNT4;
        pded->c = RT_ELEMENTS(g_aDrvFnTableNT4);
    }

    LOGF_LEAVE();
    return TRUE;
}