r0drv/haiku/spinlock-r0drv-haiku.c

	spinlock-r0drv-haiku.c revision 2b3dc93fedb4e72ac5b3cbaa89a9fc2f559be550
/* $Id$ */
/** @file
 * IPRT - Spinlocks, Ring-0 Driver, Haiku.
 */

/*
 * Copyright (C) 2012 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 "the-haiku-kernel.h"
#include "internal/iprt.h"
#include <iprt/spinlock.h>

#include <iprt/assert.h>
#include <iprt/asm.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
#include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/err.h>
#include <iprt/mem.h>
#include <iprt/thread.h>

#include "internal/magics.h"


/*******************************************************************************
*   Structures and Typedefs                                                    *
*******************************************************************************/
/**
 * Wrapper for the KSPIN_LOCK type.
 */
typedef struct RTSPINLOCKINTERNAL
{
    /** Spinlock magic value (RTSPINLOCK_MAGIC). */
    uint32_t volatile     u32Magic;
    /** Spinlock creation flags */
    uint32_t              fFlags;
    /** Saved interrupt CPU status. */
    cpu_status volatile   fIntSaved;
    /** The Haiku spinlock structure. */
    spinlock              hSpinLock;
} RTSPINLOCKINTERNAL, *PRTSPINLOCKINTERNAL;


RTDECL(int)  RTSpinlockCreate(PRTSPINLOCK pSpinlock, uint32_t fFlags, const char *pszName)
{
    RT_ASSERT_PREEMPTIBLE();
    NOREF(pszName);

    /*
     * Allocate.
     */
    AssertCompile(sizeof(RTSPINLOCKINTERNAL) > sizeof(void *));
    PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)RTMemAllocZ(sizeof(*pSpinlockInt));
    if (RT_UNLIKELY(!pSpinlockInt))
        return VERR_NO_MEMORY;

    /*
     * Initialize & return.
     */
    pSpinlockInt->u32Magic  = RTSPINLOCK_MAGIC;
    pSpinlockInt->fFlags    = fFlags;
    pSpinlockInt->fIntSaved = 0;
    B_INITIALIZE_SPINLOCK(&pSpinlockInt->hSpinLock);

    *pSpinlock = pSpinlockInt;
    return VINF_SUCCESS;
}


RTDECL(int)  RTSpinlockDestroy(RTSPINLOCK Spinlock)
{
    /*
     * Validate input.
     */
    PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
    if (RT_UNLIKELY(!pSpinlockInt))
        return VERR_INVALID_PARAMETER;
    AssertMsgReturn(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC,
                    ("Invalid spinlock %p magic=%#x\n", pSpinlockInt, pSpinlockInt->u32Magic),
                    VERR_INVALID_PARAMETER);

    /*
     * Make the lock invalid and release the memory.
     */
    ASMAtomicIncU32(&pSpinlockInt->u32Magic);

    B_INITIALIZE_SPINLOCK(&pSpinlockInt->hSpinLock);

    RTMemFree(pSpinlockInt);
    return VINF_SUCCESS;
}


RTDECL(void) RTSpinlockAcquire(RTSPINLOCK Spinlock)
{
    PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
    AssertPtr(pSpinlockInt);
    Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);

    /* Haiku cannot take spinlocks without disabling interrupts. Ignore our spinlock creation flags. */
    pSpinlockInt->fIntSaved = disable_interrupts();
    acquire_spinlock(&pSpinlockInt->hSpinLock);
}


RTDECL(void) RTSpinlockRelease(RTSPINLOCK Spinlock)
{
    PRTSPINLOCKINTERNAL pSpinlockInt = (PRTSPINLOCKINTERNAL)Spinlock;
    AssertPtr(pSpinlockInt);
    Assert(pSpinlockInt->u32Magic == RTSPINLOCK_MAGIC);

    release_spinlock(&pSpinlockInt->hSpinLock);
    restore_interrupts(pSpinlockInt->fIntSaved);
}


RTDECL(void) RTSpinlockReleaseNoInts(RTSPINLOCK Spinlock)
{
    if (!(Spinlock->fFlags & RTSPINLOCK_FLAGS_INTERRUPT_SAFE))
        RTAssertMsg2("RTSpinlockReleaseNoInts: p=%p (magic=%#x)\n", Spinlock, Spinlock->u32Magic);
    RTSpinlockRelease(Spinlock);
}