/* $Id: iprt.h 28800 2010-04-27 08:22:32Z vboxsync $ */
/** @file
 * IPRT - Internal header for miscellaneous global defs and types.
 */

/*
 * Copyright (C) 2009 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.
 */

#ifndef ___internal_iprt_h
#define ___internal_iprt_h

#include <iprt/cdefs.h>
#include <iprt/types.h>

/** @def RT_EXPORT_SYMBOL
 * This define is really here just for the linux kernel.
 * @param   Name        The symbol name.
 */
#if defined(RT_OS_LINUX) \
 && defined(IN_RING0) \
 && defined(MODULE) \
 && !defined(RT_NO_EXPORT_SYMBOL)
# define bool linux_bool /* see r0drv/linux/the-linux-kernel.h */
# ifndef AUTOCONF_INCLUDED
#  include <linux/autoconf.h>
# endif
# if defined(CONFIG_MODVERSIONS) && !defined(MODVERSIONS)
#  include <linux/version.h>
#  define MODVERSIONS
#  if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 71)
#   include <linux/modversions.h>
#  endif
# endif
# include <linux/module.h>
# undef bool
# define RT_EXPORT_SYMBOL(Name) EXPORT_SYMBOL(Name)
#else
# define RT_EXPORT_SYMBOL(Name) extern int g_rtExportSymbolDummyVariable
#endif


/** @def RT_MORE_STRICT
 * Enables more assertions in IPRT.  */
#if !defined(RT_MORE_STRICT) && (defined(DEBUG) || defined(RT_STRICT) || defined(DOXYGEN_RUNNING)) && !defined(RT_OS_WINDOWS) /** @todo enable on windows after testing */
# define RT_MORE_STRICT
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_VAR
 * Partner to RT_ASSERT_PREEMPT_CPUID_VAR. Declares and initializes a variable
 * idAssertCpu to NIL_RTCPUID if preemption is enabled and to RTMpCpuId if
 * disabled.  When RT_MORE_STRICT isn't defined it declares an uninitialized
 * dummy variable.
 *
 * Requires iprt/mp.h and iprt/asm.h.
 */
/** @def RT_ASSERT_PREEMPT_CPUID
 * Asserts that we didn't change CPU since RT_ASSERT_PREEMPT_CPUID_VAR if
 * preemption is disabled.  Will also detect changes in preemption
 * disable/enable status.  This is a noop when RT_MORE_STRICT isn't defined. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_VAR() \
    RTCPUID const idAssertCpu = RTThreadPreemptIsEnabled(NIL_RTTHREAD) ? NIL_RTCPUID : RTMpCpuId()
# define RT_ASSERT_PREEMPT_CPUID() \
   do \
   { \
        RTCPUID const idAssertCpuNow = RTThreadPreemptIsEnabled(NIL_RTTHREAD) ? NIL_RTCPUID : RTMpCpuId(); \
        AssertMsg(idAssertCpu == idAssertCpuNow,  ("%#x, %#x\n", idAssertCpu, idAssertCpuNow)); \
   } while (0)

#else
# define RT_ASSERT_PREEMPT_CPUID_VAR()  RTCPUID idAssertCpuDummy
# define RT_ASSERT_PREEMPT_CPUID()      NOREF(idAssertCpuDummy)
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED
 * Extended version of RT_ASSERT_PREEMPT_CPUID for use before
 * RTSpinlockAcquired* returns.  This macro works the idCpuOwner and idAssertCpu
 * members of the spinlock instance data.  */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis) \
    do \
    { \
        RTCPUID const idAssertCpuNow = RTMpCpuId(); \
        AssertMsg(idAssertCpu == idAssertCpuNow || idAssertCpu == NIL_RTCPUID,  ("%#x, %#x\n", idAssertCpu, idAssertCpuNow)); \
        (pThis)->idAssertCpu = idAssertCpu; \
        (pThis)->idCpuOwner  = idAssertCpuNow; \
    } while (0)
#else
# define RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED(pThis)   NOREF(idAssertCpuDummy)
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS
 * Extended version of RT_ASSERT_PREEMPT_CPUID_VAR for use with
 * RTSpinlockRelease* returns. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS()    RTCPUID idAssertCpu
#else
# define RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE_VARS()    RTCPUID idAssertCpuDummy
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE
 * Extended version of RT_ASSERT_PREEMPT_CPUID for use in RTSpinlockRelease*
 * before calling the native API for releasing the spinlock.  It must be
 * teamed up with RT_ASSERT_PREEMPT_CPUID_SPIN_ACQUIRED. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE(pThis) \
    do \
    { \
        RTCPUID const idCpuOwner     = (pThis)->idCpuOwner; \
        RTCPUID const idAssertCpuNow = RTMpCpuId(); \
        AssertMsg(idCpuOwner == idAssertCpuNow,  ("%#x, %#x\n", idCpuOwner, idAssertCpuNow)); \
        (pThis)->idCpuOwner  = NIL_RTCPUID; \
        idAssertCpu = (pThis)->idAssertCpu; \
        (pThis)->idAssertCpu = NIL_RTCPUID; \
    } while (0)
#else
# define RT_ASSERT_PREEMPT_CPUID_SPIN_RELEASE(pThis)    NOREF(idAssertCpuDummy)
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_DISABLE
 * For use in RTThreadPreemptDisable implementations after having disabled
 * preemption.  Requires iprt/mp.h. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_DISABLE(pStat) \
    do \
    { \
        Assert((pStat)->idCpu == NIL_RTCPUID); \
        (pStat)->idCpu = RTMpCpuId(); \
    } while (0)
#else
# define RT_ASSERT_PREEMPT_CPUID_DISABLE(pStat) \
    Assert((pStat)->idCpu == NIL_RTCPUID)
#endif

/** @def RT_ASSERT_PREEMPT_CPUID_RESTORE
 * For use in RTThreadPreemptRestore implementations before restoring
 * preemption.  Requires iprt/mp.h. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPT_CPUID_RESTORE(pStat) \
    do \
    { \
        RTCPUID const idAssertCpuNow = RTMpCpuId(); \
        AssertMsg((pStat)->idCpu == idAssertCpuNow,  ("%#x, %#x\n", (pStat)->idCpu, idAssertCpuNow)); \
        (pStat)->idCpu = NIL_RTCPUID; \
    } while (0)
#else
# define RT_ASSERT_PREEMPT_CPUID_RESTORE(pStat)         do { } while (0)
#endif


/** @def RT_ASSERT_INTS_ON
 * Asserts that interrupts are disabled when RT_MORE_STRICT is defined.   */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_INTS_ON()            Assert(ASMIntAreEnabled())
#else
# define RT_ASSERT_INTS_ON()            do { } while (0)
#endif

/** @def RT_ASSERT_PREEMPTIBLE
 * Asserts that preemption hasn't been disabled (using
 * RTThreadPreemptDisable) when RT_MORE_STRICT is defined. */
#ifdef RT_MORE_STRICT
# define RT_ASSERT_PREEMPTIBLE()        Assert(RTThreadPreemptIsEnabled(NIL_RTTHREAD))
#else
# define RT_ASSERT_PREEMPTIBLE()        do { } while (0)
#endif

#endif