| 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) 2016-2017 Oracle Corporation
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| 7 | *
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| 8 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 9 | * available from http://www.virtualbox.org. This file is free software;
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| 10 | * you can redistribute it and/or modify it under the terms of the GNU
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| 11 | * General Public License (GPL) as published by the Free Software
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| 12 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 13 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 14 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 15 | *
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| 16 | * The contents of this file may alternatively be used under the terms
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| 17 | * of the Common Development and Distribution License Version 1.0
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| 18 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 19 | * VirtualBox OSE distribution, in which case the provisions of the
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| 20 | * CDDL are applicable instead of those of the GPL.
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| 21 | *
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| 22 | * You may elect to license modified versions of this file under the
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| 23 | * terms and conditions of either the GPL or the CDDL or both.
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| 24 | */
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| 25 |
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| 26 | #ifndef __vd_common_h__
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| 27 | #define __vd_common_h__
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| 28 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 29 | # pragma once
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| 30 | #endif
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| 31 |
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| 32 | #include <VBox/types.h>
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| 33 |
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| 34 | /** Makes a VD structure version out of an unique magic value and major &
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| 35 | * minor version numbers.
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| 36 | *
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| 37 | * @returns 32-bit structure version number.
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| 38 | *
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| 39 | * @param uMagic 16-bit magic value. This must be unique.
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| 40 | * @param uMajor 12-bit major version number. Structures with different
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| 41 | * major numbers are not compatible.
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| 42 | * @param uMinor 4-bit minor version number. When only the minor version
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| 43 | * differs, the structures will be 100% backwards
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| 44 | * compatible.
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| 45 | */
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| 46 | #define VD_VERSION_MAKE(uMagic, uMajor, uMinor) \
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| 47 | ( ((uint32_t)(uMagic) << 16) | ((uint32_t)((uMajor) & 0xff) << 4) | ((uint32_t)((uMinor) & 0xf) << 0) )
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| 48 |
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| 49 | /** Checks if @a uVerMagic1 is compatible with @a uVerMagic2.
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| 50 | *
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| 51 | * @returns true / false.
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| 52 | * @param uVerMagic1 Typically the runtime version of the struct. This must
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| 53 | * have the same magic and major version as @a uVerMagic2
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| 54 | * and the minor version must be greater or equal to that
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| 55 | * of @a uVerMagic2.
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| 56 | * @param uVerMagic2 Typically the version the code was compiled against.
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| 57 | *
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| 58 | * @remarks The parameters will be referenced more than once.
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| 59 | */
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| 60 | #define VD_VERSION_ARE_COMPATIBLE(uVerMagic1, uVerMagic2) \
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| 61 | ( (uVerMagic1) == (uVerMagic2) \
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| 62 | || ( (uVerMagic1) >= (uVerMagic2) \
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| 63 | && ((uVerMagic1) & UINT32_C(0xfffffff0)) == ((uVerMagic2) & UINT32_C(0xfffffff0)) ) \
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| 64 | )
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| 65 |
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| 66 | #endif
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