linux/include/uapi/linux/swab.h

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_SWAB_H
#define _UAPI_LINUX_SWAB_H

#include <linux/types.h>
#include <linux/stddef.h>
#include <asm/bitsperlong.h>
#include <asm/swab.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 ___constant_swab16(x) …

#define ___constant_swab32(x) …

#define ___constant_swab64(x) …

#define ___constant_swahw32(x) …

#define ___constant_swahb32(x) …

/*
 * 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 __fswab16(__u16 val)
{ … }

static inline __attribute_const__ __u32 __fswab32(__u32 val)
{ … }

static inline __attribute_const__ __u64 __fswab64(__u64 val)
{ … }

static inline __attribute_const__ __u32 __fswahw32(__u32 val)
{ … }

static inline __attribute_const__ __u32 __fswahb32(__u32 val)
{ … }

/**
 * __swab16 - return a byteswapped 16-bit value
 * @x: value to byteswap
 */
#ifdef __HAVE_BUILTIN_BSWAP16__
#define __swab16(x) …
#else
#define __swab16 …
#endif

/**
 * __swab32 - return a byteswapped 32-bit value
 * @x: value to byteswap
 */
#ifdef __HAVE_BUILTIN_BSWAP32__
#define __swab32(x) …
#else
#define __swab32 …
#endif

/**
 * __swab64 - return a byteswapped 64-bit value
 * @x: value to byteswap
 */
#ifdef __HAVE_BUILTIN_BSWAP64__
#define __swab64(x) …
#else
#define __swab64 …
#endif

static __always_inline unsigned long __swab(const unsigned long y)
{ … }

/**
 * __swahw32 - return a word-swapped 32-bit value
 * @x: value to wordswap
 *
 * __swahw32(0x12340000) is 0x00001234
 */
#define __swahw32(x) …

/**
 * __swahb32 - return a high and low byte-swapped 32-bit value
 * @x: value to byteswap
 *
 * __swahb32(0x12345678) is 0x34127856
 */
#define __swahb32(x) …

/**
 * __swab16p - return a byteswapped 16-bit value from a pointer
 * @p: pointer to a naturally-aligned 16-bit value
 */
static __always_inline __u16 __swab16p(const __u16 *p)
{ … }

/**
 * __swab32p - return a byteswapped 32-bit value from a pointer
 * @p: pointer to a naturally-aligned 32-bit value
 */
static __always_inline __u32 __swab32p(const __u32 *p)
{ … }

/**
 * __swab64p - return a byteswapped 64-bit value from a pointer
 * @p: pointer to a naturally-aligned 64-bit value
 */
static __always_inline __u64 __swab64p(const __u64 *p)
{ … }

/**
 * __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)
{ … }

/**
 * __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)
{ … }

/**
 * __swab16s - byteswap a 16-bit value in-place
 * @p: pointer to a naturally-aligned 16-bit value
 */
static inline void __swab16s(__u16 *p)
{ … }
/**
 * __swab32s - byteswap a 32-bit value in-place
 * @p: pointer to a naturally-aligned 32-bit value
 */
static __always_inline void __swab32s(__u32 *p)
{ … }

/**
 * __swab64s - byteswap a 64-bit value in-place
 * @p: pointer to a naturally-aligned 64-bit value
 */
static __always_inline void __swab64s(__u64 *p)
{ … }

/**
 * __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)
{ … }

/**
 * __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)
{ … }


#endif /* _UAPI_LINUX_SWAB_H */