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lvm2/lib/mm/xlate.h

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/*
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* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This file is part of LVM2.
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*
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* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
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*
* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
#ifndef _LVM_XLATE_H
#define _LVM_XLATE_H
#ifdef __linux__
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# include <endian.h>
# include <byteswap.h>
#else
# include <machine/endian.h>
# define bswap_16(x) (((x) & 0x00ffU) << 8 | \
((x) & 0xff00U) >> 8)
# define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
((x) & 0xff000000U) >> 24 | \
((x) & 0x0000ff00U) << 8 | \
((x) & 0x00ff0000U) >> 8)
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# define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
((x) & 0xff00000000000000ULL) >> 56 | \
((x) & 0x000000000000ff00ULL) << 40 | \
((x) & 0x00ff000000000000ULL) >> 40 | \
((x) & 0x0000000000ff0000ULL) << 24 | \
((x) & 0x0000ff0000000000ULL) >> 24 | \
((x) & 0x00000000ff000000ULL) << 8 | \
((x) & 0x000000ff00000000ULL) >> 8)
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#endif
#if BYTE_ORDER == LITTLE_ENDIAN
/* New clearer variants. */
#define le16_to_cpu(x) (x)
#define le32_to_cpu(x) (x)
#define le64_to_cpu(x) (x)
#define cpu_to_le16(x) (x)
#define cpu_to_le32(x) (x)
#define cpu_to_le64(x) (x)
#define be16_to_cpu(x) bswap_16(x)
#define be32_to_cpu(x) bswap_32(x)
#define be64_to_cpu(x) bswap_64(x)
#define cpu_to_be16(x) bswap_16(x)
#define cpu_to_be32(x) bswap_32(x)
#define cpu_to_be64(x) bswap_64(x)
/* Old alternative variants. */
#define xlate16(x) (x)
#define xlate32(x) (x)
#define xlate64(x) (x)
#define xlate16_be(x) bswap_16(x)
#define xlate32_be(x) bswap_32(x)
#define xlate64_be(x) bswap_64(x)
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#elif BYTE_ORDER == BIG_ENDIAN
/* New clearer variants. */
#define le16_to_cpu(x) bswap_16(x)
#define le32_to_cpu(x) bswap_32(x)
#define le64_to_cpu(x) bswap_64(x)
#define cpu_to_le16(x) bswap_16(x)
#define cpu_to_le32(x) bswap_32(x)
#define cpu_to_le64(x) bswap_64(x)
#define be16_to_cpu(x) (x)
#define be32_to_cpu(x) (x)
#define be64_to_cpu(x) (x)
#define cpu_to_be16(x) (x)
#define cpu_to_be32(x) (x)
#define cpu_to_be64(x) (x)
/* Old alternative variants. */
#define xlate16(x) bswap_16(x)
#define xlate32(x) bswap_32(x)
#define xlate64(x) bswap_64(x)
#define xlate16_be(x) (x)
#define xlate32_be(x) (x)
#define xlate64_be(x) (x)
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#else
#include <asm/byteorder.h>
/* New clearer variants. */
#define le16_to_cpu(x) __le16_to_cpu(x)
#define le32_to_cpu(x) __le32_to_cpu(x)
#define le64_to_cpu(x) __le64_to_cpu(x)
#define cpu_to_le16(x) __cpu_to_le16(x)
#define cpu_to_le32(x) __cpu_to_le32(x)
#define cpu_to_le64(x) __cpu_to_le64(x)
#define be16_to_cpu(x) __be16_to_cpu(x)
#define be32_to_cpu(x) __be32_to_cpu(x)
#define be64_to_cpu(x) __be64_to_cpu(x)
#define cpu_to_be16(x) __cpu_to_be16(x)
#define cpu_to_be32(x) __cpu_to_be32(x)
#define cpu_to_be64(x) __cpu_to_be64(x)
/* Old alternative variants. */
#define xlate16(x) __cpu_to_le16(x)
#define xlate32(x) __cpu_to_le32(x)
#define xlate64(x) __cpu_to_le64(x)
#define xlate16_be(x) __cpu_to_be16(x)
#define xlate32_be(x) __cpu_to_be32(x)
#define xlate64_be(x) __cpu_to_be64(x)
#endif
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#endif