/* $Id: hgsmimemalloc.c,v 1.1.1.1 2019/01/09 23:50:31 mrg Exp $ */
/*
 * Copyright (C) 2017 Oracle Corporation
 *
 * 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
 */

/*
 * Memory allocator
 * ----------------
 *
 * Implementation
 * --------------
 *
 * Since the X.Org driver is single threaded and works using an allocate,
 * submit and free pattern, we replace the generic allocator with a simple
 * Boolean.  Need more be said?
 */

#include <VBoxVideoIPRT.h>
#include <HGSMIMemAlloc.h>
#include <HGSMI.h>

int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea,
                HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock,
                const HGSMIENV *pEnv)
{
    (void)paDescriptors;
    (void)cDescriptors;
    (void)cbMaxBlock;
    (void)pEnv;
    if (!(pArea->cbArea < UINT32_C(0x80000000)))
        return VERR_INVALID_PARAMETER;
    if (!(pArea->cbArea >= HGSMI_MA_BLOCK_SIZE_MIN))
        return VERR_INVALID_PARAMETER;

    pMA->area = *pArea;
    pMA->fAllocated = false;
    return VINF_SUCCESS;
}

void HGSMIMAUninit(HGSMIMADATA *pMA)
{
    (void)pMA;
}

static HGSMIOFFSET HGSMIMAPointerToOffset(const HGSMIMADATA *pMA, const void *pv)
{
    if (HGSMIAreaContainsPointer(&pMA->area, pv))
    {
        return HGSMIPointerToOffset(&pMA->area, pv);
    }

    AssertFailed();
    return HGSMIOFFSET_VOID;
}

static void *HGSMIMAOffsetToPointer(const HGSMIMADATA *pMA, HGSMIOFFSET off)
{
    if (HGSMIAreaContainsOffset(&pMA->area, off))
    {
        return HGSMIOffsetToPointer(&pMA->area, off);
    }

    AssertFailed();
    return NULL;
}

void *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb)
{
    (void)cb;
    if (pMA->fAllocated)
        return NULL;
    HGSMIOFFSET off = pMA->area.offBase;
    return HGSMIMAOffsetToPointer(pMA, off);
    pMA->fAllocated = true;
}

void HGSMIMAFree(HGSMIMADATA *pMA, void *pv)
{
    HGSMIOFFSET off = HGSMIMAPointerToOffset(pMA, pv);
    if (off != HGSMIOFFSET_VOID)
    {
        pMA->fAllocated = false;
    }
    else
    {
        AssertFailed();
    }
}