40c9f22210
Collect the implementations from include/linux/byteorder/swab.h, swabb.h
in swab.h
The functionality provided covers:
u16 swab16(u16 val) - return a byteswapped 16 bit value
u32 swab32(u32 val) - return a byteswapped 32 bit value
u64 swab64(u64 val) - return a byteswapped 64 bit value
u32 swahw32(u32 val) - return a wordswapped 32 bit value
u32 swahb32(u32 val) - return a high/low byteswapped 32 bit value
Similar to above, but return swapped value from a naturally-aligned pointer
u16 swab16p(u16 *p)
u32 swab32p(u32 *p)
u64 swab64p(u64 *p)
u32 swahw32p(u32 *p)
u32 swahb32p(u32 *p)
Similar to above, but swap the value in-place (in-situ)
void swab16s(u16 *p)
void swab32s(u32 *p)
void swab64s(u64 *p)
void swahw32s(u32 *p)
void swahb32s(u32 *p)
Arches can override any of these with an optimized version by defining an
inline in their asm/byteorder.h (example given for swab16()):
u16 __arch_swab16() {}
#define __arch_swab16 __arch_swab16
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
310 lines
6.9 KiB
C
310 lines
6.9 KiB
C
#ifndef _LINUX_SWAB_H
|
|
#define _LINUX_SWAB_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/compiler.h>
|
|
#include <asm/byteorder.h>
|
|
|
|
/*
|
|
* casts are necessary for constants, because we never know how for sure
|
|
* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
|
|
*/
|
|
#define __const_swab16(x) ((__u16)( \
|
|
(((__u16)(x) & (__u16)0x00ffU) << 8) | \
|
|
(((__u16)(x) & (__u16)0xff00U) >> 8)))
|
|
|
|
#define __const_swab32(x) ((__u32)( \
|
|
(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
|
|
(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
|
|
(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
|
|
(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
|
|
|
|
#define __const_swab64(x) ((__u64)( \
|
|
(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
|
|
(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
|
|
(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
|
|
(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \
|
|
(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \
|
|
(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
|
|
(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
|
|
(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
|
|
|
|
#define __const_swahw32(x) ((__u32)( \
|
|
(((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
|
|
(((__u32)(x) & (__u32)0xffff0000UL) >> 16)))
|
|
|
|
#define __const_swahb32(x) ((__u32)( \
|
|
(((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
|
|
(((__u32)(x) & (__u32)0xff00ff00UL) >> 8)))
|
|
|
|
/*
|
|
* Implement the following as inlines, but define the interface using
|
|
* macros to allow constant folding when possible:
|
|
* ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32
|
|
*/
|
|
|
|
static inline __attribute_const__ __u16 ___swab16(__u16 val)
|
|
{
|
|
#ifdef __arch_swab16
|
|
return __arch_swab16(val);
|
|
#elif defined(__arch_swab16p)
|
|
return __arch_swab16p(&val);
|
|
#else
|
|
return __const_swab16(val);
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute_const__ __u32 ___swab32(__u32 val)
|
|
{
|
|
#ifdef __arch_swab32
|
|
return __arch_swab32(val);
|
|
#elif defined(__arch_swab32p)
|
|
return __arch_swab32p(&val);
|
|
#else
|
|
return __const_swab32(val);
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute_const__ __u64 ___swab64(__u64 val)
|
|
{
|
|
#ifdef __arch_swab64
|
|
return __arch_swab64(val);
|
|
#elif defined(__arch_swab64p)
|
|
return __arch_swab64p(&val);
|
|
#elif defined(__SWAB_64_THRU_32__)
|
|
__u32 h = val >> 32;
|
|
__u32 l = val & ((1ULL << 32) - 1);
|
|
return (((__u64)___swab32(l)) << 32) | ((__u64)(___swab32(h)));
|
|
#else
|
|
return __const_swab64(val);
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute_const__ __u32 ___swahw32(__u32 val)
|
|
{
|
|
#ifdef __arch_swahw32
|
|
return __arch_swahw32(val);
|
|
#elif defined(__arch_swahw32p)
|
|
return __arch_swahw32p(&val);
|
|
#else
|
|
return __const_swahw32(val);
|
|
#endif
|
|
}
|
|
|
|
static inline __attribute_const__ __u32 ___swahb32(__u32 val)
|
|
{
|
|
#ifdef __arch_swahb32
|
|
return __arch_swahb32(val);
|
|
#elif defined(__arch_swahb32p)
|
|
return __arch_swahb32p(&val);
|
|
#else
|
|
return __const_swahb32(val);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swab16 - return a byteswapped 16-bit value
|
|
* @x: value to byteswap
|
|
*/
|
|
#define __swab16(x) \
|
|
(__builtin_constant_p((__u16)(x)) ? \
|
|
__const_swab16((x)) : \
|
|
___swab16((x)))
|
|
|
|
/**
|
|
* __swab32 - return a byteswapped 32-bit value
|
|
* @x: value to byteswap
|
|
*/
|
|
#define __swab32(x) \
|
|
(__builtin_constant_p((__u32)(x)) ? \
|
|
__const_swab32((x)) : \
|
|
___swab32((x)))
|
|
|
|
/**
|
|
* __swab64 - return a byteswapped 64-bit value
|
|
* @x: value to byteswap
|
|
*/
|
|
#define __swab64(x) \
|
|
(__builtin_constant_p((__u64)(x)) ? \
|
|
__const_swab64((x)) : \
|
|
___swab64((x)))
|
|
|
|
/**
|
|
* __swahw32 - return a word-swapped 32-bit value
|
|
* @x: value to wordswap
|
|
*
|
|
* __swahw32(0x12340000) is 0x00001234
|
|
*/
|
|
#define __swahw32(x) \
|
|
(__builtin_constant_p((__u32)(x)) ? \
|
|
__const_swahw32((x)) : \
|
|
___swahw32((x)))
|
|
|
|
/**
|
|
* __swahb32 - return a high and low byte-swapped 32-bit value
|
|
* @x: value to byteswap
|
|
*
|
|
* __swahb32(0x12345678) is 0x34127856
|
|
*/
|
|
#define __swahb32(x) \
|
|
(__builtin_constant_p((__u32)(x)) ? \
|
|
__const_swahb32((x)) : \
|
|
___swahb32((x)))
|
|
|
|
/**
|
|
* __swab16p - return a byteswapped 16-bit value from a pointer
|
|
* @p: pointer to a naturally-aligned 16-bit value
|
|
*/
|
|
static inline __u16 __swab16p(const __u16 *p)
|
|
{
|
|
#ifdef __arch_swab16p
|
|
return __arch_swab16p(p);
|
|
#else
|
|
return __swab16(*p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swab32p - return a byteswapped 32-bit value from a pointer
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*/
|
|
static inline __u32 __swab32p(const __u32 *p)
|
|
{
|
|
#ifdef __arch_swab32p
|
|
return __arch_swab32p(p);
|
|
#else
|
|
return __swab32(*p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swab64p - return a byteswapped 64-bit value from a pointer
|
|
* @p: pointer to a naturally-aligned 64-bit value
|
|
*/
|
|
static inline __u64 __swab64p(const __u64 *p)
|
|
{
|
|
#ifdef __arch_swab64p
|
|
return __arch_swab64p(p);
|
|
#else
|
|
return __swab64(*p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swahw32p - return a wordswapped 32-bit value from a pointer
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*
|
|
* See __swahw32() for details of wordswapping.
|
|
*/
|
|
static inline __u32 __swahw32p(const __u32 *p)
|
|
{
|
|
#ifdef __arch_swahw32p
|
|
return __arch_swahw32p(p);
|
|
#else
|
|
return __swahw32(*p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swahb32p - return a high and low byteswapped 32-bit value from a pointer
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*
|
|
* See __swahb32() for details of high/low byteswapping.
|
|
*/
|
|
static inline __u32 __swahb32p(const __u32 *p)
|
|
{
|
|
#ifdef __arch_swahb32p
|
|
return __arch_swahb32p(p);
|
|
#else
|
|
return __swahb32(*p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swab16s - byteswap a 16-bit value in-place
|
|
* @p: pointer to a naturally-aligned 16-bit value
|
|
*/
|
|
static inline void __swab16s(__u16 *p)
|
|
{
|
|
#ifdef __arch_swab16s
|
|
__arch_swab16s(p);
|
|
#else
|
|
*p = __swab16p(p);
|
|
#endif
|
|
}
|
|
/**
|
|
* __swab32s - byteswap a 32-bit value in-place
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*/
|
|
static inline void __swab32s(__u32 *p)
|
|
{
|
|
#ifdef __arch_swab32s
|
|
__arch_swab32s(p);
|
|
#else
|
|
*p = __swab32p(p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swab64s - byteswap a 64-bit value in-place
|
|
* @p: pointer to a naturally-aligned 64-bit value
|
|
*/
|
|
static inline void __swab64s(__u64 *p)
|
|
{
|
|
#ifdef __arch_swab64s
|
|
__arch_swab64s(p);
|
|
#else
|
|
*p = __swab64p(p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swahw32s - wordswap a 32-bit value in-place
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*
|
|
* See __swahw32() for details of wordswapping
|
|
*/
|
|
static inline void __swahw32s(__u32 *p)
|
|
{
|
|
#ifdef __arch_swahw32s
|
|
__arch_swahw32s(p);
|
|
#else
|
|
*p = __swahw32p(p);
|
|
#endif
|
|
}
|
|
|
|
/**
|
|
* __swahb32s - high and low byteswap a 32-bit value in-place
|
|
* @p: pointer to a naturally-aligned 32-bit value
|
|
*
|
|
* See __swahb32() for details of high and low byte swapping
|
|
*/
|
|
static inline void __swahb32s(__u32 *p)
|
|
{
|
|
#ifdef __arch_swahb32s
|
|
__arch_swahb32s(p);
|
|
#else
|
|
*p = __swahb32p(p);
|
|
#endif
|
|
}
|
|
|
|
#ifdef __KERNEL__
|
|
# define swab16 __swab16
|
|
# define swab32 __swab32
|
|
# define swab64 __swab64
|
|
# define swahw32 __swahw32
|
|
# define swahb32 __swahb32
|
|
# define swab16p __swab16p
|
|
# define swab32p __swab32p
|
|
# define swab64p __swab64p
|
|
# define swahw32p __swahw32p
|
|
# define swahb32p __swahb32p
|
|
# define swab16s __swab16s
|
|
# define swab32s __swab32s
|
|
# define swab64s __swab64s
|
|
# define swahw32s __swahw32s
|
|
# define swahb32s __swahb32s
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* _LINUX_SWAB_H */
|