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Revert to standard linux macros (for correct behaviour on rare architectures).

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This commit is contained in:
Alasdair Kergon 2002-05-21 12:37:07 +00:00
parent d327698491
commit 1f835295d8
1 changed files with 5 additions and 41 deletions
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46
lib/mm/xlate.h
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@ -1,53 +1,17 @@
/* /*
* Copyright (C) 2001 Sistina Software (UK) Limited. * Copyright (C) 2001 Sistina Software (UK) Limited.
* *
* This file is released under the GPL. * This file is released under the LGPL.
* *
*/ */
#ifndef _LVM_XLATE_H #ifndef _LVM_XLATE_H
#define _LVM_XLATE_H #define _LVM_XLATE_H
#include <stdlib.h> #include <asm/byteorder.h>
#include <stdint.h>
#if __BYTE_ORDER == __BIG_ENDIAN #define xlate16(x) __cpu_to_le16((x));
#define xlate32(x) __cpu_to_le32((x));
static inline uint16_t swab16(uint16_t x) #define xlate64(x) __cpu_to_le64((x));
{
return (x & 0x00ffU) << 8 |
(x & 0xff00U) >> 8;
}
static inline uint32_t swab32(uint32_t x)
{
return (x & 0x000000ffU) << 24 |
(x & 0x0000ff00U) << 8 |
(x & 0x00ff0000U) >> 8 |
(x & 0xff000000U) >> 24;
}
static inline uint64_t swab64(uint64_t x)
{
return (x & 0x00000000000000ffULL) << 56 |
(x & 0x000000000000ff00ULL) << 40 |
(x & 0x0000000000ff0000ULL) << 24 |
(x & 0x00000000ff000000ULL) << 8 |
(x & 0x000000ff00000000ULL) >> 8 |
(x & 0x0000ff0000000000ULL) >> 24 |
(x & 0x00ff000000000000ULL) >> 40 |
(x & 0xff00000000000000ULL) >> 56;
}
# define xlate16(x) swab16((x))
# define xlate32(x) swab32((x))
# define xlate64(x) swab64((x))
#elif __BYTE_ORDER == __LITTLE_ENDIAN
# define xlate16(x) (x)
# define xlate32(x) (x)
# define xlate64(x) (x)
#else
# error "__BYTE_ORDER must be defined as __LITTLE_ENDIAN or __BIG_ENDIAN"
#endif
#endif #endif