diff options
Diffstat (limited to 'src/VBox/Runtime/r0drv/initterm-r0drv.cpp')
| -rw-r--r-- | src/VBox/Runtime/r0drv/initterm-r0drv.cpp | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r0drv/initterm-r0drv.cpp b/src/VBox/Runtime/r0drv/initterm-r0drv.cpp new file mode 100644 index 00000000..894edeff --- /dev/null +++ b/src/VBox/Runtime/r0drv/initterm-r0drv.cpp @@ -0,0 +1,164 @@ +/* $Id: initterm-r0drv.cpp $ */ +/** @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(); +} + |