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[/] [hf-risc/] [trunk/] [tools/] [riscv-gnu-toolchain-master/] [linux-headers/] [include/] [linux/] [swab.h] - Blame information for rev 13

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1 13 serginhofr 
#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 <asm/swab.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 ___constant_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 ___constant_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 ___constant_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 ___constant_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 ___constant_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__  __u16 __fswab16(__u16 val)
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{
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#ifdef __HAVE_BUILTIN_BSWAP16__
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        return __builtin_bswap16(val);
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#elif defined (__arch_swab16)
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        return __arch_swab16(val);
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#else
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        return ___constant_swab16(val);
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#endif
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}
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static __inline__  __u32 __fswab32(__u32 val)
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{
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#ifdef __HAVE_BUILTIN_BSWAP32__
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        return __builtin_bswap32(val);
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#elif defined(__arch_swab32)
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        return __arch_swab32(val);
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#else
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        return ___constant_swab32(val);
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#endif
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}
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static __inline__  __u64 __fswab64(__u64 val)
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{
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#ifdef __HAVE_BUILTIN_BSWAP64__
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        return __builtin_bswap64(val);
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#elif defined (__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)__fswab32(l)) << 32) | ((__u64)(__fswab32(h)));
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#else
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        return ___constant_swab64(val);
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#endif
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}
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static __inline__  __u32 __fswahw32(__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 ___constant_swahw32(val);
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#endif
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}
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static __inline__  __u32 __fswahb32(__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 ___constant_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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        ___constant_swab16(x) :                 \
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        __fswab16(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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        ___constant_swab32(x) :                 \
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        __fswab32(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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        ___constant_swab64(x) :                 \
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        __fswab64(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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        ___constant_swahw32(x) :                \
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        __fswahw32(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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        ___constant_swahb32(x) :                \
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        __fswahb32(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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#endif /* _LINUX_SWAB_H */

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