acf0108a84
This makes the new implementation of the byteorder helpers match the old in how it degraded when an arch-defined version was not available: 1) swab() - look for arch defined - if not, use generic c version 2) swabp() - look for arch-defined - if not, deref pointer and use swab() 3) swabs() - look for arch defined - if not, use swabp Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
299 lines
6.6 KiB
C
299 lines
6.6 KiB
C
#ifndef _LINUX_SWAB_H
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#define _LINUX_SWAB_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <asm/byteorder.h>
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/*
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* casts are necessary for constants, because we never know how for sure
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* how U/UL/ULL map to __u16, __u32, __u64. At least not in a portable way.
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*/
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#define __const_swab16(x) ((__u16)( \
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(((__u16)(x) & (__u16)0x00ffU) << 8) | \
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(((__u16)(x) & (__u16)0xff00U) >> 8)))
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#define __const_swab32(x) ((__u32)( \
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(((__u32)(x) & (__u32)0x000000ffUL) << 24) | \
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(((__u32)(x) & (__u32)0x0000ff00UL) << 8) | \
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(((__u32)(x) & (__u32)0x00ff0000UL) >> 8) | \
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(((__u32)(x) & (__u32)0xff000000UL) >> 24)))
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#define __const_swab64(x) ((__u64)( \
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(((__u64)(x) & (__u64)0x00000000000000ffULL) << 56) | \
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(((__u64)(x) & (__u64)0x000000000000ff00ULL) << 40) | \
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(((__u64)(x) & (__u64)0x0000000000ff0000ULL) << 24) | \
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(((__u64)(x) & (__u64)0x00000000ff000000ULL) << 8) | \
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(((__u64)(x) & (__u64)0x000000ff00000000ULL) >> 8) | \
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(((__u64)(x) & (__u64)0x0000ff0000000000ULL) >> 24) | \
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(((__u64)(x) & (__u64)0x00ff000000000000ULL) >> 40) | \
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(((__u64)(x) & (__u64)0xff00000000000000ULL) >> 56)))
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#define __const_swahw32(x) ((__u32)( \
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(((__u32)(x) & (__u32)0x0000ffffUL) << 16) | \
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(((__u32)(x) & (__u32)0xffff0000UL) >> 16)))
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#define __const_swahb32(x) ((__u32)( \
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(((__u32)(x) & (__u32)0x00ff00ffUL) << 8) | \
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(((__u32)(x) & (__u32)0xff00ff00UL) >> 8)))
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/*
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* Implement the following as inlines, but define the interface using
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* macros to allow constant folding when possible:
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* ___swab16, ___swab32, ___swab64, ___swahw32, ___swahb32
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*/
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static inline __attribute_const__ __u16 ___swab16(__u16 val)
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{
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#ifdef __arch_swab16
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return __arch_swab16(val);
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#else
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return __const_swab16(val);
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#endif
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}
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static inline __attribute_const__ __u32 ___swab32(__u32 val)
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{
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#ifdef __arch_swab32
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return __arch_swab32(val);
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#else
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return __const_swab32(val);
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#endif
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}
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static inline __attribute_const__ __u64 ___swab64(__u64 val)
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{
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#ifdef __arch_swab64
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return __arch_swab64(val);
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#elif defined(__SWAB_64_THRU_32__)
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__u32 h = val >> 32;
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__u32 l = val & ((1ULL << 32) - 1);
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return (((__u64)___swab32(l)) << 32) | ((__u64)(___swab32(h)));
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#else
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return __const_swab64(val);
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#endif
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}
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static inline __attribute_const__ __u32 ___swahw32(__u32 val)
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{
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#ifdef __arch_swahw32
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return __arch_swahw32(val);
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#else
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return __const_swahw32(val);
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#endif
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}
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static inline __attribute_const__ __u32 ___swahb32(__u32 val)
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{
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#ifdef __arch_swahb32
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return __arch_swahb32(val);
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#else
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return __const_swahb32(val);
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#endif
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}
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/**
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* __swab16 - return a byteswapped 16-bit value
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* @x: value to byteswap
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*/
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#define __swab16(x) \
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(__builtin_constant_p((__u16)(x)) ? \
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__const_swab16((x)) : \
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___swab16((x)))
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/**
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* __swab32 - return a byteswapped 32-bit value
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* @x: value to byteswap
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*/
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#define __swab32(x) \
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(__builtin_constant_p((__u32)(x)) ? \
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__const_swab32((x)) : \
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___swab32((x)))
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/**
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* __swab64 - return a byteswapped 64-bit value
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* @x: value to byteswap
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*/
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#define __swab64(x) \
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(__builtin_constant_p((__u64)(x)) ? \
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__const_swab64((x)) : \
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___swab64((x)))
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/**
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* __swahw32 - return a word-swapped 32-bit value
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* @x: value to wordswap
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*
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* __swahw32(0x12340000) is 0x00001234
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*/
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#define __swahw32(x) \
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(__builtin_constant_p((__u32)(x)) ? \
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__const_swahw32((x)) : \
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___swahw32((x)))
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/**
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* __swahb32 - return a high and low byte-swapped 32-bit value
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* @x: value to byteswap
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*
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* __swahb32(0x12345678) is 0x34127856
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*/
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#define __swahb32(x) \
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(__builtin_constant_p((__u32)(x)) ? \
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__const_swahb32((x)) : \
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___swahb32((x)))
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/**
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* __swab16p - return a byteswapped 16-bit value from a pointer
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* @p: pointer to a naturally-aligned 16-bit value
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*/
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static inline __u16 __swab16p(const __u16 *p)
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{
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#ifdef __arch_swab16p
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return __arch_swab16p(p);
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#else
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return __swab16(*p);
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#endif
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}
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/**
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* __swab32p - return a byteswapped 32-bit value from a pointer
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* @p: pointer to a naturally-aligned 32-bit value
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*/
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static inline __u32 __swab32p(const __u32 *p)
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{
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#ifdef __arch_swab32p
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return __arch_swab32p(p);
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#else
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return __swab32(*p);
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#endif
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}
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/**
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* __swab64p - return a byteswapped 64-bit value from a pointer
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* @p: pointer to a naturally-aligned 64-bit value
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*/
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static inline __u64 __swab64p(const __u64 *p)
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{
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#ifdef __arch_swab64p
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return __arch_swab64p(p);
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#else
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return __swab64(*p);
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#endif
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}
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/**
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* __swahw32p - return a wordswapped 32-bit value from a pointer
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* @p: pointer to a naturally-aligned 32-bit value
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*
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* See __swahw32() for details of wordswapping.
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*/
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static inline __u32 __swahw32p(const __u32 *p)
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{
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#ifdef __arch_swahw32p
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return __arch_swahw32p(p);
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#else
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return __swahw32(*p);
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#endif
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}
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/**
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* __swahb32p - return a high and low byteswapped 32-bit value from a pointer
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* @p: pointer to a naturally-aligned 32-bit value
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*
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* See __swahb32() for details of high/low byteswapping.
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*/
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static inline __u32 __swahb32p(const __u32 *p)
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{
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#ifdef __arch_swahb32p
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return __arch_swahb32p(p);
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#else
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return __swahb32(*p);
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#endif
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}
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/**
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* __swab16s - byteswap a 16-bit value in-place
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* @p: pointer to a naturally-aligned 16-bit value
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*/
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static inline void __swab16s(__u16 *p)
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{
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#ifdef __arch_swab16s
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__arch_swab16s(p);
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#else
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*p = __swab16p(p);
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#endif
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}
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/**
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* __swab32s - byteswap a 32-bit value in-place
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* @p: pointer to a naturally-aligned 32-bit value
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*/
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static inline void __swab32s(__u32 *p)
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{
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#ifdef __arch_swab32s
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__arch_swab32s(p);
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#else
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*p = __swab32p(p);
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#endif
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}
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/**
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* __swab64s - byteswap a 64-bit value in-place
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* @p: pointer to a naturally-aligned 64-bit value
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*/
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static inline void __swab64s(__u64 *p)
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{
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#ifdef __arch_swab64s
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__arch_swab64s(p);
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#else
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*p = __swab64p(p);
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#endif
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}
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/**
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* __swahw32s - wordswap a 32-bit value in-place
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* @p: pointer to a naturally-aligned 32-bit value
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*
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* See __swahw32() for details of wordswapping
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*/
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static inline void __swahw32s(__u32 *p)
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{
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#ifdef __arch_swahw32s
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__arch_swahw32s(p);
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#else
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*p = __swahw32p(p);
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#endif
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}
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/**
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* __swahb32s - high and low byteswap a 32-bit value in-place
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* @p: pointer to a naturally-aligned 32-bit value
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*
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* See __swahb32() for details of high and low byte swapping
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*/
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static inline void __swahb32s(__u32 *p)
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{
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#ifdef __arch_swahb32s
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__arch_swahb32s(p);
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#else
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*p = __swahb32p(p);
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#endif
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}
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#ifdef __KERNEL__
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# define swab16 __swab16
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# define swab32 __swab32
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# define swab64 __swab64
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# define swahw32 __swahw32
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# define swahb32 __swahb32
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# define swab16p __swab16p
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# define swab32p __swab32p
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# define swab64p __swab64p
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# define swahw32p __swahw32p
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# define swahb32p __swahb32p
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# define swab16s __swab16s
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# define swab32s __swab32s
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# define swab64s __swab64s
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# define swahw32s __swahw32s
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# define swahb32s __swahb32s
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#endif /* __KERNEL__ */
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#endif /* _LINUX_SWAB_H */
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