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/* $Id: HGSMIMemAlloc.h $ */
/** @file
* VBox Host Guest Shared Memory Interface (HGSMI) - Memory allocator.
*/
/*
* Copyright (C) 2014-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#ifndef VBOX_INCLUDED_Graphics_HGSMIMemAlloc_h
#define VBOX_INCLUDED_Graphics_HGSMIMemAlloc_h
#ifndef RT_WITHOUT_PRAGMA_ONCE
# pragma once
#endif
#include "HGSMIDefs.h"
#include "VBoxVideoIPRT.h"
/* Descriptor. */
#define HGSMI_MA_DESC_OFFSET_MASK UINT32_C(0xFFFFFFE0)
#define HGSMI_MA_DESC_FREE_MASK UINT32_C(0x00000010)
#define HGSMI_MA_DESC_ORDER_MASK UINT32_C(0x0000000F)
#define HGSMI_MA_DESC_OFFSET(d) ((d) & HGSMI_MA_DESC_OFFSET_MASK)
#define HGSMI_MA_DESC_IS_FREE(d) (((d) & HGSMI_MA_DESC_FREE_MASK) != 0)
#define HGSMI_MA_DESC_ORDER(d) ((d) & HGSMI_MA_DESC_ORDER_MASK)
#define HGSMI_MA_DESC_ORDER_BASE UINT32_C(5)
#define HGSMI_MA_BLOCK_SIZE_MIN (UINT32_C(1) << (HGSMI_MA_DESC_ORDER_BASE + 0))
#define HGSMI_MA_BLOCK_SIZE_MAX (UINT32_C(1) << (HGSMI_MA_DESC_ORDER_BASE + HGSMI_MA_DESC_ORDER_MASK))
/* HGSMI_MA_DESC_ORDER_BASE must correspond to HGSMI_MA_DESC_OFFSET_MASK. */
AssertCompile((~HGSMI_MA_DESC_OFFSET_MASK + 1) == HGSMI_MA_BLOCK_SIZE_MIN);
typedef struct HGSMIMABLOCK
{
RTLISTNODE nodeBlock;
RTLISTNODE nodeFree;
HGSMIOFFSET descriptor;
} HGSMIMABLOCK;
typedef struct HGSMIMADATA
{
HGSMIAREA area;
HGSMIENV env;
HGSMISIZE cbMaxBlock;
uint32_t cBlocks; /* How many blocks in the listBlocks. */
RTLISTANCHOR listBlocks; /* All memory blocks, sorted. */
RTLISTANCHOR aListFreeBlocks[HGSMI_MA_DESC_ORDER_MASK + 1]; /* For free blocks of each order. */
} HGSMIMADATA;
RT_C_DECLS_BEGIN
int HGSMIMAInit(HGSMIMADATA *pMA, const HGSMIAREA *pArea,
HGSMIOFFSET *paDescriptors, uint32_t cDescriptors, HGSMISIZE cbMaxBlock,
const HGSMIENV *pEnv);
void HGSMIMAUninit(HGSMIMADATA *pMA);
void RT_UNTRUSTED_VOLATILE_HSTGST *HGSMIMAAlloc(HGSMIMADATA *pMA, HGSMISIZE cb);
void HGSMIMAFree(HGSMIMADATA *pMA, void RT_UNTRUSTED_VOLATILE_GUEST *pv);
HGSMIMABLOCK *HGSMIMASearchOffset(HGSMIMADATA *pMA, HGSMIOFFSET off);
uint32_t HGSMIPopCnt32(uint32_t u32);
DECLINLINE(HGSMISIZE) HGSMIMAOrder2Size(HGSMIOFFSET order)
{
return (UINT32_C(1) << (HGSMI_MA_DESC_ORDER_BASE + order));
}
DECLINLINE(HGSMIOFFSET) HGSMIMASize2Order(HGSMISIZE cb)
{
HGSMIOFFSET order = HGSMIPopCnt32(cb - 1) - HGSMI_MA_DESC_ORDER_BASE;
#ifdef HGSMI_STRICT
Assert(HGSMIMAOrder2Size(order) == cb);
#endif
return order;
}
RT_C_DECLS_END
#endif /* !VBOX_INCLUDED_Graphics_HGSMIMemAlloc_h */
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