Current File : //proc/self/root/usr/src/vboxhost-6.0.14/vboxdrv/r0drv/initterm-r0drv.c
/* $Id: initterm-r0drv.cpp 127855 2019-01-01 01:45:53Z bird $ */
/** @file
* IPRT - Initialization & Termination, R0 Driver, Common.
*/
/*
* Copyright (C) 2006-2019 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/initterm.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/mp.h>
#include <iprt/thread.h>
#ifndef IN_GUEST /* play safe for now */
# include "r0drv/mp-r0drv.h"
# include "r0drv/power-r0drv.h"
#endif
#include "internal/initterm.h"
#include "internal/mem.h"
#include "internal/thread.h"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Count of current IPRT users.
* In ring-0 several drivers / kmods / kexts / wossnames may share the
* same runtime code. So, we need to keep count in order not to terminate
* it prematurely. */
static int32_t volatile g_crtR0Users = 0;
/**
* Initializes the ring-0 driver runtime library.
*
* @returns iprt status code.
* @param fReserved Flags reserved for the future.
*/
RTR0DECL(int) RTR0Init(unsigned fReserved)
{
int rc;
uint32_t cNewUsers;
Assert(fReserved == 0); RT_NOREF_PV(fReserved);
#ifndef RT_OS_SOLARIS /* On Solaris our thread preemption information is only obtained in rtR0InitNative().*/
RT_ASSERT_PREEMPTIBLE();
#endif
/*
* The first user initializes it.
* We rely on the module loader to ensure that there are no
* initialization races should two modules share the IPRT.
*/
cNewUsers = ASMAtomicIncS32(&g_crtR0Users);
if (cNewUsers != 1)
{
if (cNewUsers > 1)
return VINF_SUCCESS;
ASMAtomicDecS32(&g_crtR0Users);
return VERR_INTERNAL_ERROR_3;
}
rc = rtR0InitNative();
if (RT_SUCCESS(rc))
{
#ifdef RTR0MEM_WITH_EF_APIS
rtR0MemEfInit();
#endif
rc = rtThreadInit();
if (RT_SUCCESS(rc))
{
#ifndef IN_GUEST /* play safe for now */
rc = rtR0MpNotificationInit();
if (RT_SUCCESS(rc))
{
rc = rtR0PowerNotificationInit();
if (RT_SUCCESS(rc))
return rc;
rtR0MpNotificationTerm();
}
#else
if (RT_SUCCESS(rc))
return rc;
#endif
rtThreadTerm();
}
#ifdef RTR0MEM_WITH_EF_APIS
rtR0MemEfTerm();
#endif
rtR0TermNative();
}
return rc;
}
RT_EXPORT_SYMBOL(RTR0Init);
static void rtR0Term(void)
{
rtThreadTerm();
#ifndef IN_GUEST /* play safe for now */
rtR0PowerNotificationTerm();
rtR0MpNotificationTerm();
#endif
#ifdef RTR0MEM_WITH_EF_APIS
rtR0MemEfTerm();
#endif
rtR0TermNative();
}
/**
* Terminates the ring-0 driver runtime library.
*/
RTR0DECL(void) RTR0Term(void)
{
int32_t cNewUsers;
RT_ASSERT_PREEMPTIBLE();
cNewUsers = ASMAtomicDecS32(&g_crtR0Users);
Assert(cNewUsers >= 0);
if (cNewUsers == 0)
rtR0Term();
else if (cNewUsers < 0)
ASMAtomicIncS32(&g_crtR0Users);
}
RT_EXPORT_SYMBOL(RTR0Term);
/* Note! Should *not* be exported since it's only for static linking. */
RTR0DECL(void) RTR0TermForced(void)
{
RT_ASSERT_PREEMPTIBLE();
AssertMsg(g_crtR0Users == 1, ("%d\n", g_crtR0Users));
ASMAtomicWriteS32(&g_crtR0Users, 0);
rtR0Term();
}
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