byteorder.h

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/* SPDX-License-Identifier: GPL-2.0+ */
 
#ifndef __BYTEORDER_H__
#define __BYTEORDER_H__
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <types.h>
 
static inline u16_t __swab16(u16_t x) {
    return ((x << 8) | (x >> 8));
}
 
static inline u32_t __swab32(u32_t x) {
    return ((x << 24) | (x >> 24) | ((x & (u32_t) 0x0000ff00UL) << 8) | ((x & (u32_t) 0x00ff0000UL) >> 8));
}
 
static inline u64_t __swab64(u64_t x) {
    return ((x << 56) | (x >> 56) | ((x & (u64_t) 0x000000000000ff00ULL) << 40) | ((x & (u64_t) 0x0000000000ff0000ULL) << 24) | ((x & (u64_t) 0x00000000ff000000ULL) << 8) |
            ((x & (u64_t) 0x000000ff00000000ULL) >> 8) | ((x & (u64_t) 0x0000ff0000000000ULL) >> 24) | ((x & (u64_t) 0x00ff000000000000ULL) >> 40));
}
 
/*
 * swap bytes bizarrely.
 * swahw32 - swap 16-bit half-words in a 32-bit word
 */
static inline u32_t __swahw32(u32_t x) {
    return (((x & (u32_t) 0x0000ffffUL) << 16) | ((x & (u32_t) 0xffff0000UL) >> 16));
}
 
/*
 * swap bytes bizarrely.
 * swahb32 - swap 8-bit halves of each 16-bit half-word in a 32-bit word
 */
static inline u32_t __swahb32(u32_t x) {
    return (((x & (u32_t) 0x00ff00ffUL) << 8) | ((x & (u32_t) 0xff00ff00UL) >> 8));
}
 
#if (BYTE_ORDER == BIG_ENDIAN)
#define cpu_to_le64(x) (__swab64((u64_t) (x)))
#define le64_to_cpu(x) (__swab64((u64_t) (x)))
#define cpu_to_le32(x) (__swab32((u32_t) (x)))
#define le32_to_cpu(x) (__swab32((u32_t) (x)))
#define cpu_to_le16(x) (__swab16((u16_t) (x)))
#define le16_to_cpu(x) (__swab16((u16_t) (x)))
#define cpu_to_be64(x) ((u64_t) (x))
#define be64_to_cpu(x) ((u64_t) (x))
#define cpu_to_be32(x) ((u32_t) (x))
#define be32_to_cpu(x) ((u32_t) (x))
#define cpu_to_be16(x) ((u16_t) (x))
#define be16_to_cpu(x) ((u16_t) (x))
#else
#define cpu_to_le64(x) ((u64_t) (x))
#define le64_to_cpu(x) ((u64_t) (x))
#define cpu_to_le32(x) ((u32_t) (x))
#define le32_to_cpu(x) ((u32_t) (x))
#define cpu_to_le16(x) ((u16_t) (x))
#define le16_to_cpu(x) ((u16_t) (x))
#define cpu_to_be64(x) (__swab64((u64_t) (x)))
#define be64_to_cpu(x) (__swab64((u64_t) (x)))
#define cpu_to_be32(x) (__swab32((u32_t) (x)))
#define be32_to_cpu(x) (__swab32((u32_t) (x)))
#define cpu_to_be16(x) (__swab16((u16_t) (x)))
#define be16_to_cpu(x) (__swab16((u16_t) (x)))
#endif
 
#ifdef __cplusplus
}
#endif
 
#endif /* __BYTEORDER_H__ */