| 1 | /* $Id: swab.h 62506 2016-07-22 19:09:44Z vboxsync $ */
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| 2 | /** @file
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| 3 | *
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| 4 | * VBox storage devices:
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| 5 | * C++-safe replacements for some Linux byte order macros
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| 6 | *
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| 7 | * On Linux, DrvHostDVD.cpp includes <linux/cdrom.h>, which in turn
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| 8 | * includes <linux/byteorder/swab.h>. Unfortunately, that file is not very
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| 9 | * C++ friendly, and our C++ compiler refuses to look at it. The solution
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| 10 | * is to define _LINUX_BYTEORDER_SWAB_H, which prevents that file's contents
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| 11 | * from getting included at all, and to provide, in this file, our own
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| 12 | * C++-proof versions of the macros which are needed by <linux/cdrom.h>
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| 13 | * before we include that file. We actually provide them as inline
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| 14 | * functions, due to the way they get resolved in the original.
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| 15 | */
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| 16 |
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| 17 | /*
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| 18 | * Copyright (C) 2006-2016 Oracle Corporation
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| 19 | *
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| 20 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 21 | * available from http://www.virtualbox.org. This file is free software;
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| 22 | * you can redistribute it and/or modify it under the terms of the GNU
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| 23 | * General Public License (GPL) as published by the Free Software
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| 24 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 25 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 26 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 27 | */
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| 28 |
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| 29 | #ifndef _VBOX_LINUX_SWAB_H
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| 30 | #define _VBOX_LINUX_SWAB_H
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| 31 |
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| 32 | #define _LINUX_BYTEORDER_SWAB_H
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| 33 | #define _LINUX_BYTEORDER_SWABB_H
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| 34 |
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| 35 | #include <asm/types.h>
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| 36 |
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| 37 | /* Sorry for the unnecessary brackets here, but I really think
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| 38 | readability requires them */
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| 39 | static __inline__ __u16 __swab16p(const __u16 *px)
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| 40 | {
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| 41 | __u16 x = *px;
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| 42 | return ((x & 0xff) << 8) | ((x >> 8) & 0xff);
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| 43 | }
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| 44 |
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| 45 | static __inline__ __u32 __swab32p(const __u32 *px)
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| 46 | {
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| 47 | __u32 x = *px;
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| 48 | return ((x & 0xff) << 24) | ((x & 0xff00) << 8)
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| 49 | | ((x >> 8) & 0xff00) | ((x >> 24) & 0xff);
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| 50 | }
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| 51 |
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| 52 | static __inline__ __u64 __swab64p(const __u64 *px)
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| 53 | {
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| 54 | __u64 x = *px;
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| 55 | return ((x & 0xff) << 56) | ((x & 0xff00) << 40)
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| 56 | | ((x & 0xff0000) << 24) | ((x & 0xff000000) << 8)
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| 57 | | ((x >> 8) & 0xff000000) | ((x >> 24) & 0xff0000)
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| 58 | | ((x >> 40) & 0xff00) | ((x >> 56) & 0xff);
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| 59 | }
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| 60 |
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| 61 | #endif /* _VBOX_LINUX_SWAB_H */
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