| 1 | /** @file
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| 2 | * VD: common definitions for the registration, backend and interface structures.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2016-2022 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.virtualbox.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef VBOX_INCLUDED_vd_common_h
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| 37 | #define VBOX_INCLUDED_vd_common_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <VBox/types.h>
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| 43 |
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| 44 | /** Makes a VD structure version out of an unique magic value and major &
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| 45 | * minor version numbers.
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| 46 | *
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| 47 | * @returns 32-bit structure version number.
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| 48 | *
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| 49 | * @param uMagic 16-bit magic value. This must be unique.
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| 50 | * @param uMajor 12-bit major version number. Structures with different
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| 51 | * major numbers are not compatible.
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| 52 | * @param uMinor 4-bit minor version number. When only the minor version
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| 53 | * differs, the structures will be 100% backwards
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| 54 | * compatible.
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| 55 | */
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| 56 | #define VD_VERSION_MAKE(uMagic, uMajor, uMinor) \
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| 57 | ( ((uint32_t)(uMagic) << 16) | ((uint32_t)((uMajor) & 0xff) << 4) | ((uint32_t)((uMinor) & 0xf) << 0) )
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| 58 |
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| 59 | /** Checks if @a uVerMagic1 is compatible with @a uVerMagic2.
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| 60 | *
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| 61 | * @returns true / false.
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| 62 | * @param uVerMagic1 Typically the runtime version of the struct. This must
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| 63 | * have the same magic and major version as @a uVerMagic2
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| 64 | * and the minor version must be greater or equal to that
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| 65 | * of @a uVerMagic2.
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| 66 | * @param uVerMagic2 Typically the version the code was compiled against.
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| 67 | *
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| 68 | * @remarks The parameters will be referenced more than once.
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| 69 | */
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| 70 | #define VD_VERSION_ARE_COMPATIBLE(uVerMagic1, uVerMagic2) \
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| 71 | ( (uVerMagic1) == (uVerMagic2) \
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| 72 | || ( (uVerMagic1) >= (uVerMagic2) \
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| 73 | && ((uVerMagic1) & UINT32_C(0xfffffff0)) == ((uVerMagic2) & UINT32_C(0xfffffff0)) ) \
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| 74 | )
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| 75 |
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| 76 | #endif /* !VBOX_INCLUDED_vd_common_h */
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