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implement our own swabbing functions, instead of relying on the kernel's.

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This commit is contained in:
Andres Salomon 2002-05-07 15:28:59 +00:00
parent 3fb25e3f0f
commit 8ac9aae78a
1 changed files with 32 additions and 7 deletions
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39
lib/mm/xlate.h
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@ -8,21 +8,46 @@
#ifndef _LVM_XLATE_H #ifndef _LVM_XLATE_H
#define _LVM_XLATE_H #define _LVM_XLATE_H
#include <asm/byteorder.h> #include <stdlib.h>
#include <stdint.h>
static inline uint16_t xlate16(uint16_t x) #if __BYTE_ORDER == __BIG_ENDIAN
static inline uint16_t swab16(uint16_t x)
{ {
return __cpu_to_le16(x); return (x & 0x00ffU) << 8 |
(x & 0xff00U) >> 8;
} }
static inline uint32_t xlate32(uint32_t x) static inline uint32_t swab32(uint32_t x)
{ {
return __cpu_to_le32(x); return (x & 0x000000ffU) << 24 |
(x & 0x0000ff00U) << 8 |
(x & 0x00ff0000U) >> 8 |
(x & 0xff000000U) >> 24;
} }
static inline uint64_t xlate64(uint64_t x) static inline uint64_t swab64(uint64_t x)
{ {
return __cpu_to_le64(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