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Restructure xlate.h

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This commit is contained in:
Alasdair Kergon 2004-09-02 13:53:25 +00:00
parent 513633f49a
commit e39e66df93
2 changed files with 36 additions and 35 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.00.22 -
==================================
Restructure xlate.h
Version 2.00.21 - 19th August 2004
==================================

70
lib/mm/xlate.h
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@ -17,6 +17,41 @@
#define _LVM_XLATE_H
#ifdef linux
# 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)
# define bswap_64(x) (((x) & 0x00000000000000ffU) << 56 | \
((x) & 0xff00000000000000U) >> 56 | \
((x) & 0x000000000000ff00U) << 40 | \
((x) & 0x00ff000000000000U) >> 40 | \
((x) & 0x0000000000ff0000U) << 24 | \
((x) & 0x0000ff0000000000U) >> 24 | \
((x) & 0x00000000ff000000U) << 8 | \
((x) & 0x000000ff00000000U) >> 8)
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
# 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)
#elif BYTE_ORDER == BIG_ENDIAN
# 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)
#else
# include <asm/byteorder.h>
# define xlate16(x) __cpu_to_le16((x))
# define xlate32(x) __cpu_to_le32((x))
@ -24,41 +59,6 @@
# define xlate16_be(x) __cpu_to_be16((x))
# define xlate32_be(x) __cpu_to_be32((x))
# define xlate64_be(x) __cpu_to_be64((x))
#else
# include <machine/endian.h>
# if !defined(BYTE_ORDER) || \
(BYTE_ORDER != BIG_ENDIAN && BYTE_ORDER != LITTLE_ENDIAN)
# error "Undefined or unrecognised BYTE_ORDER";
# endif
# define __xlate16(x) (((x) & 0x00ffU) << 8 | \
((x) & 0xff00U) >> 8)
# define __xlate32(x) (((x) & 0x000000ffU) << 24 | \
((x) & 0xff000000U) >> 24 | \
((x) & 0x0000ff00U) << 8 | \
((x) & 0x00ff0000U) >> 8)
# define __xlate64(x) (((x) & 0x00000000000000ffU) << 56 | \
((x) & 0xff00000000000000U) >> 56 | \
((x) & 0x000000000000ff00U) << 40 | \
((x) & 0x00ff000000000000U) >> 40 | \
((x) & 0x0000000000ff0000U) << 24 | \
((x) & 0x0000ff0000000000U) >> 24 | \
((x) & 0x00000000ff000000U) << 8 | \
((x) & 0x000000ff00000000U) >> 8)
# if BYTE_ORDER == LITTLE_ENDIAN
# define xlate16(x) (x)
# define xlate32(x) (x)
# define xlate64(x) (x)
# define xlate16_be(x) __xlate16(x)
# define xlate32_be(x) __xlate32(x)
# define xlate64_be(x) __xlate64(x)
# else
# define xlate16(x) __xlate16(x)
# define xlate32(x) __xlate32(x)
# define xlate64(x) __xlate64(x)
# define xlate16_be(x) (x)
# define xlate32_be(x) (x)
# define xlate64_be(x) (x)
# endif
#endif
#endif