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Diffstat (limited to '')
| -rw-r--r-- | include/VBox/vd-common.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/include/VBox/vd-common.h b/include/VBox/vd-common.h new file mode 100644 index 00000000..e41a5a9c --- /dev/null +++ b/include/VBox/vd-common.h @@ -0,0 +1,66 @@ +/** @file + * VD: common definitions for the registration, backend and interface structures. + */ + +/* + * Copyright (C) 2016-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#ifndef VBOX_INCLUDED_vd_common_h +#define VBOX_INCLUDED_vd_common_h +#ifndef RT_WITHOUT_PRAGMA_ONCE +# pragma once +#endif + +#include <VBox/types.h> + +/** Makes a VD structure version out of an unique magic value and major & + * minor version numbers. + * + * @returns 32-bit structure version number. + * + * @param uMagic 16-bit magic value. This must be unique. + * @param uMajor 12-bit major version number. Structures with different + * major numbers are not compatible. + * @param uMinor 4-bit minor version number. When only the minor version + * differs, the structures will be 100% backwards + * compatible. + */ +#define VD_VERSION_MAKE(uMagic, uMajor, uMinor) \ + ( ((uint32_t)(uMagic) << 16) | ((uint32_t)((uMajor) & 0xff) << 4) | ((uint32_t)((uMinor) & 0xf) << 0) ) + +/** Checks if @a uVerMagic1 is compatible with @a uVerMagic2. + * + * @returns true / false. + * @param uVerMagic1 Typically the runtime version of the struct. This must + * have the same magic and major version as @a uVerMagic2 + * and the minor version must be greater or equal to that + * of @a uVerMagic2. + * @param uVerMagic2 Typically the version the code was compiled against. + * + * @remarks The parameters will be referenced more than once. + */ +#define VD_VERSION_ARE_COMPATIBLE(uVerMagic1, uVerMagic2) \ + ( (uVerMagic1) == (uVerMagic2) \ + || ( (uVerMagic1) >= (uVerMagic2) \ + && ((uVerMagic1) & UINT32_C(0xfffffff0)) == ((uVerMagic2) & UINT32_C(0xfffffff0)) ) \ + ) + +#endif /* !VBOX_INCLUDED_vd_common_h */ |