source: vbox/trunk/src/VBox/Additions/WINNT/Graphics/Video/mp/wddm/VBoxMPVdma.cpp@ 94927

/* $Id: VBoxMPVdma.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
/** @file
 * VBox WDDM Miniport driver
 */

/*
 * Copyright (C) 2011-2022 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.
 */

#include "VBoxMPWddm.h"
#include "common/VBoxMPCommon.h"
#include "VBoxMPVdma.h"
#ifdef VBOX_WITH_VIDEOHWACCEL
#include "VBoxMPVhwa.h"
#endif
#include <iprt/asm.h>
#include <iprt/mem.h>


static DECLCALLBACK(void *) hgsmiEnvAlloc(void *pvEnv, HGSMISIZE cb)
{
    NOREF(pvEnv);
    return RTMemAlloc(cb);
}

static DECLCALLBACK(void) hgsmiEnvFree(void *pvEnv, void *pv)
{
    NOREF(pvEnv);
    RTMemFree(pv);
}

static HGSMIENV g_hgsmiEnvVdma =
{
    NULL,
    hgsmiEnvAlloc,
    hgsmiEnvFree
};

/* create a DMACommand buffer */
int vboxVdmaCreate(PVBOXMP_DEVEXT pDevExt, VBOXVDMAINFO *pInfo
        )
{
    RT_NOREF(pDevExt);
    pInfo->fEnabled           = FALSE;

    return VINF_SUCCESS;
}

int vboxVdmaDisable (PVBOXMP_DEVEXT pDevExt, PVBOXVDMAINFO pInfo)
{
    RT_NOREF(pDevExt);

    if (!pInfo->fEnabled)
        return VINF_ALREADY_INITIALIZED;

    /* ensure nothing else is submitted */
    pInfo->fEnabled        = FALSE;
    return VINF_SUCCESS;
}

int vboxVdmaEnable (PVBOXMP_DEVEXT pDevExt, PVBOXVDMAINFO pInfo)
{
    RT_NOREF(pDevExt);
    Assert(!pInfo->fEnabled);
    if (pInfo->fEnabled)
        return VINF_ALREADY_INITIALIZED;
    return VINF_SUCCESS;
}

int vboxVdmaDestroy (PVBOXMP_DEVEXT pDevExt, PVBOXVDMAINFO pInfo)
{
    int rc = VINF_SUCCESS;
    Assert(!pInfo->fEnabled);
    if (pInfo->fEnabled)
        rc = vboxVdmaDisable (pDevExt, pInfo);
    return rc;
}