r0drv/nt/initterm-r0drv-nt.cpp

	initterm-r0drv-nt.cpp revision 327eb9cb3b67ef426f4f654a97412afa0b86fb56
/* $Id$ */
/** @file
 * IPRT - Initialization & Termination, R0 Driver, NT.
 */

/*
 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
 *
 * 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.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 USA or visit http://www.sun.com if you need
 * additional information or have any questions.
 */

/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include "the-nt-kernel.h"
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mp.h>
#include <iprt/string.h>
#include "internal/initterm.h"
#include "internal-r0drv-nt.h"


/*******************************************************************************
*   Global Variables                                                           *
*******************************************************************************/
/** The Nt CPU set.
 * KeQueryActiveProcssors() cannot be called at all IRQLs and therefore we'll
 * have to cache it. Fortunately, Nt doesn't really support taking CPUs offline
 * or online. It's first with W2K8 that support for CPU hotplugging was added.
 * Once we start caring about this, we'll simply let the native MP event callback
 * and update this variable as CPUs comes online. (The code is done already.)
 */
RTCPUSET                    g_rtMpNtCpuSet;

/** ExSetTimerResolution, introduced in W2K. */
PFNMYEXSETTIMERRESOLUTION   g_pfnrtNtExSetTimerResolution;
/** KeFlushQueuedDpcs, introduced in XP. */
PFNMYKEFLUSHQUEUEDDPCS      g_pfnrtNtKeFlushQueuedDpcs;

/** Offset of the _KPRCB::QuantumEnd field. 0 if not found. */
uint32_t                    g_offrtNtPbQuantumEnd;
/** Size of the _KPRCB::QuantumEnd field. 0 if not found. */
uint32_t                    g_cbrtNtPbQuantumEnd;
/** Offset of the _KPRCB::DpcQueueDepth field. 0 if not found. */
uint32_t                    g_offrtNtPbDpcQueueDepth;


int rtR0InitNative(void)
{
    /*
     * Init the Nt cpu set.
     */
    KAFFINITY ActiveProcessors = KeQueryActiveProcessors();
    RTCpuSetEmpty(&g_rtMpNtCpuSet);
    RTCpuSetFromU64(&g_rtMpNtCpuSet, ActiveProcessors);

    /*
     * Initialize the function pointers.
     */
    UNICODE_STRING RoutineName;
    RtlInitUnicodeString(&RoutineName, L"ExSetTimerResolution");
    g_pfnrtNtExSetTimerResolution = (PFNMYEXSETTIMERRESOLUTION)MmGetSystemRoutineAddress(&RoutineName);

    RtlInitUnicodeString(&RoutineName, L"KeFlushQueuedDpcs");
    g_pfnrtNtKeFlushQueuedDpcs = (PFNMYKEFLUSHQUEUEDDPCS)MmGetSystemRoutineAddress(&RoutineName);

    /*
     * Get some info that might come in handy below.
     */
    ULONG MajorVersion = 0;
    ULONG MinorVersion = 0;
    ULONG BuildNumber  = 0;
    PsGetVersion(&MajorVersion, &MinorVersion, &BuildNumber, NULL);

    KIRQL OldIrql;
    KeRaiseIrql(DISPATCH_LEVEL, &OldIrql); /* make sure we stay on the same cpu */

    union
    {
        uint32_t auRegs[4];
        char szVendor[4*3+1];
    } u;
    ASMCpuId(0, &u.auRegs[3], &u.auRegs[0], &u.auRegs[2], &u.auRegs[1]);
    u.szVendor[4*3] = '\0';

    /*
     * Try find _KPRCB::QuantumEnd and possibly also _KPRCB::DpcQueueDepth.
     */
    __try
    {
        /* HACK ALERT! The offsets are from poking around in windbg. */
#if defined(RT_ARCH_X86)
        PKPCR    pPcr   = (PKPCR)__readfsdword(RT_OFFSETOF(KPCR,SelfPcr));
        uint8_t *pbPrcb = (uint8_t *)pPcr->Prcb;

        if (    BuildNumber == 2600                             /* XP SP2 */
            &&  !memcmp(&pbPrcb[0x900], &u.szVendor[0], 4*3))
        {
            g_offrtNtPbQuantumEnd    = 0x88c;
            g_cbrtNtPbQuantumEnd     = 4;
            g_offrtNtPbDpcQueueDepth = 0x870;
        }
        /** @todo more */
        //pbQuantumEnd = (uint8_t volatile *)pPcr->Prcb + 0x1a41;

#elif defined(RT_ARCH_AMD64)
        PKPCR    pPcr   = (PKPCR)__readgsqword(RT_OFFSETOF(KPCR,Self));
        uint8_t *pbPrcb = (uint8_t *)pPcr->CurrentPrcb;
        /** @todo proper detection! */
        if (pbPrcb[0x3375] <= 1)
        {
            g_offrtNtPbQuantumEnd    = 0x3375;
            g_cbrtNtPbQuantumEnd     = 1;
            g_offrtNtPbDpcQueueDepth = 0;
        }

#else
# error "port me"
#endif
    }
    __except(EXCEPTION_EXECUTE_HANDLER)
    {
        g_offrtNtPbQuantumEnd    = 0;
        g_cbrtNtPbQuantumEnd     = 0;
        g_offrtNtPbDpcQueueDepth = 0;
    }

    KeLowerIrql(OldIrql);

#ifndef IN_GUEST /** @todo fix above for all Nt versions. */
    if (!g_offrtNtPbQuantumEnd && !g_offrtNtPbDpcQueueDepth)
        DbgPrint("IPRT: Neither _KPRCB::QuantumEnd nor _KPRCB::DpcQueueDepth was not found!\n");
#endif

    return VINF_SUCCESS;
}


void rtR0TermNative(void)
{
}