76 lines
3 KiB
C
76 lines
3 KiB
C
/** @file
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* VD: common definitions for the registration, backend and interface structures.
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*/
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/*
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* Copyright (C) 2016-2023 Oracle and/or its affiliates.
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*
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* This file is part of VirtualBox base platform packages, as
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* available from https://www.virtualbox.org.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, in version 3 of the
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* License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses>.
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*
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* The contents of this file may alternatively be used under the terms
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* of the Common Development and Distribution License Version 1.0
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* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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* in the VirtualBox distribution, in which case the provisions of the
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* CDDL are applicable instead of those of the GPL.
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*
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* You may elect to license modified versions of this file under the
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* terms and conditions of either the GPL or the CDDL or both.
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*
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* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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*/
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#ifndef VBOX_INCLUDED_vd_common_h
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#define VBOX_INCLUDED_vd_common_h
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#ifndef RT_WITHOUT_PRAGMA_ONCE
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# pragma once
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#endif
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#include <VBox/types.h>
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/** Makes a VD structure version out of an unique magic value and major &
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* minor version numbers.
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*
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* @returns 32-bit structure version number.
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*
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* @param uMagic 16-bit magic value. This must be unique.
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* @param uMajor 12-bit major version number. Structures with different
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* major numbers are not compatible.
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* @param uMinor 4-bit minor version number. When only the minor version
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* differs, the structures will be 100% backwards
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* compatible.
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*/
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#define VD_VERSION_MAKE(uMagic, uMajor, uMinor) \
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( ((uint32_t)(uMagic) << 16) | ((uint32_t)((uMajor) & 0xff) << 4) | ((uint32_t)((uMinor) & 0xf) << 0) )
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/** Checks if @a uVerMagic1 is compatible with @a uVerMagic2.
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*
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* @returns true / false.
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* @param uVerMagic1 Typically the runtime version of the struct. This must
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* have the same magic and major version as @a uVerMagic2
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* and the minor version must be greater or equal to that
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* of @a uVerMagic2.
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* @param uVerMagic2 Typically the version the code was compiled against.
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*
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* @remarks The parameters will be referenced more than once.
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*/
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#define VD_VERSION_ARE_COMPATIBLE(uVerMagic1, uVerMagic2) \
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( (uVerMagic1) == (uVerMagic2) \
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|| ( (uVerMagic1) >= (uVerMagic2) \
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&& ((uVerMagic1) & UINT32_C(0xfffffff0)) == ((uVerMagic2) & UINT32_C(0xfffffff0)) ) \
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)
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#endif /* !VBOX_INCLUDED_vd_common_h */
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