/*
 * Copyright 1990,91 by Thomas Roell, Dinkelscherben, Germany
 * Copyright 1993 by David Wexelblat <dwex@goblin.org>
 * Copyright 1999 by David Holland <davidh@iquest.net>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the names of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT
 * SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 *
 */
/* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifdef HAVE_XORG_CONFIG_H
#include <xorg-config.h>
#endif

#include <sys/types.h>          /* get __x86 definition if not set by compiler */

#if defined(__i386__) || defined(__i386) || defined(__x86)
#define _NEED_SYSI86
#endif
#include "xf86.h"
#include "xf86Priv.h"
#include "xf86_OSlib.h"
#include "xf86OSpriv.h"
#include <sys/mman.h>

/***************************************************************************/
/* Video Memory Mapping section 					   */
/***************************************************************************/

_X_HIDDEN void
xf86OSInitVidMem(VidMemInfoPtr pVidMem)
{
    pVidMem->initialised = TRUE;
}

/***************************************************************************/
/* I/O Permissions section						   */
/***************************************************************************/

#if defined(__i386__) || defined(__i386) || defined(__x86)
static Bool ExtendedEnabled = FALSE;
#endif

Bool
xf86EnableIO(void)
{
#if defined(__i386__) || defined(__i386) || defined(__x86)
    if (ExtendedEnabled)
        return TRUE;

    if (sysi86(SI86V86, V86SC_IOPL, PS_IOPL) < 0) {
        xf86Msg(X_WARNING, "xf86EnableIOPorts: Failed to set IOPL for I/O\n");
        return FALSE;
    }
    ExtendedEnabled = TRUE;
#endif                          /* i386 */
    return TRUE;
}

void
xf86DisableIO(void)
{
#if defined(__i386__) || defined(__i386) || defined(__x86)
    if (!ExtendedEnabled)
        return;

    sysi86(SI86V86, V86SC_IOPL, 0);

    ExtendedEnabled = FALSE;
#endif                          /* i386 */
}