/* $Id: memuserkernel-r0drv-os2.cpp 40304 2012-02-29 20:02:14Z vboxsync $ */
/** @file
 * IPRT - User & Kernel Memory, Ring-0 Driver, OS/2.
 */

/*
 * 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.
 */


/*******************************************************************************
*   Header Files                                                               *
*******************************************************************************/
#include "the-os2-kernel.h"

#include <iprt/mem.h>
#include <iprt/err.h>


RTR0DECL(int) RTR0MemUserCopyFrom(void *pvDst, RTR3PTR R3PtrSrc, size_t cb)
{
    int rc = KernCopyIn(pvDst, (void *)R3PtrSrc, cb);
    if (RT_LIKELY(rc == 0))
        return VINF_SUCCESS;
    return VERR_ACCESS_DENIED;
}


RTR0DECL(int) RTR0MemUserCopyTo(RTR3PTR R3PtrDst, void const *pvSrc, size_t cb)
{
    int rc = KernCopyOut((void *)R3PtrDst, (void *)pvSrc, cb);
    if (RT_LIKELY(rc == 0))
        return VINF_SUCCESS;
    return VERR_ACCESS_DENIED;
}


RTR0DECL(bool) RTR0MemUserIsValidAddr(RTR3PTR R3Ptr)
{
    /** @todo this is all wrong, but I'm too lazy to figure out how to make it
     *        correct. Checking the user DS limit would work if it wasn't maxed
     *        out by SDD, VPC or someone. The version (+SMP) would help on older
     *        OS/2 versions where the limit is 512MB. */
    return R3Ptr < UINT32_C(0xc0000000); /* 3GB */
}


RTR0DECL(bool) RTR0MemKernelIsValidAddr(void *pv)
{
    /** @todo this is all wrong, see RTR0MemUserIsValidAddr. */
    return (uintptr_t)pv >= UINT32_C(0x20000000); /* 512MB */
}


RTR0DECL(bool) RTR0MemAreKrnlAndUsrDifferent(void)
{
    /** @todo this is all wrong, see RTR0MemUserIsValidAddr. */
    return false;
}