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294 lines
7.2 KiB
294 lines
7.2 KiB
/*
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* Byte order utilities
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*
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* Copyright (C) 1999-2013, Broadcom Corporation
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* $Id: bcmendian.h 241182 2011-02-17 21:50:03Z $
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*
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* This file by default provides proper behavior on little-endian architectures.
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* On big-endian architectures, IL_BIGENDIAN should be defined.
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*/
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#ifndef _BCMENDIAN_H_
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#define _BCMENDIAN_H_
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#include <typedefs.h>
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/* Reverse the bytes in a 16-bit value */
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#define BCMSWAP16(val) \
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((uint16)((((uint16)(val) & (uint16)0x00ffU) << 8) | \
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(((uint16)(val) & (uint16)0xff00U) >> 8)))
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/* Reverse the bytes in a 32-bit value */
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#define BCMSWAP32(val) \
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((uint32)((((uint32)(val) & (uint32)0x000000ffU) << 24) | \
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(((uint32)(val) & (uint32)0x0000ff00U) << 8) | \
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(((uint32)(val) & (uint32)0x00ff0000U) >> 8) | \
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(((uint32)(val) & (uint32)0xff000000U) >> 24)))
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/* Reverse the two 16-bit halves of a 32-bit value */
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#define BCMSWAP32BY16(val) \
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((uint32)((((uint32)(val) & (uint32)0x0000ffffU) << 16) | \
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(((uint32)(val) & (uint32)0xffff0000U) >> 16)))
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/* Byte swapping macros
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* Host <=> Network (Big Endian) for 16- and 32-bit values
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* Host <=> Little-Endian for 16- and 32-bit values
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*/
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#ifndef hton16
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#define HTON16(i) BCMSWAP16(i)
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#define hton16(i) bcmswap16(i)
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#define HTON32(i) BCMSWAP32(i)
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#define hton32(i) bcmswap32(i)
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#define NTOH16(i) BCMSWAP16(i)
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#define ntoh16(i) bcmswap16(i)
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#define NTOH32(i) BCMSWAP32(i)
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#define ntoh32(i) bcmswap32(i)
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#define LTOH16(i) (i)
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#define ltoh16(i) (i)
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#define LTOH32(i) (i)
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#define ltoh32(i) (i)
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#define HTOL16(i) (i)
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#define htol16(i) (i)
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#define HTOL32(i) (i)
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#define htol32(i) (i)
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#endif /* hton16 */
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#define ltoh16_buf(buf, i)
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#define htol16_buf(buf, i)
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/* Unaligned loads and stores in host byte order */
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#define load32_ua(a) ltoh32_ua(a)
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#define store32_ua(a, v) htol32_ua_store(v, a)
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#define load16_ua(a) ltoh16_ua(a)
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#define store16_ua(a, v) htol16_ua_store(v, a)
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#define _LTOH16_UA(cp) ((cp)[0] | ((cp)[1] << 8))
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#define _LTOH32_UA(cp) ((cp)[0] | ((cp)[1] << 8) | ((cp)[2] << 16) | ((cp)[3] << 24))
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#define _NTOH16_UA(cp) (((cp)[0] << 8) | (cp)[1])
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#define _NTOH32_UA(cp) (((cp)[0] << 24) | ((cp)[1] << 16) | ((cp)[2] << 8) | (cp)[3])
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#define ltoh_ua(ptr) \
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(sizeof(*(ptr)) == sizeof(uint8) ? *(const uint8 *)(ptr) : \
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sizeof(*(ptr)) == sizeof(uint16) ? _LTOH16_UA((const uint8 *)(ptr)) : \
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sizeof(*(ptr)) == sizeof(uint32) ? _LTOH32_UA((const uint8 *)(ptr)) : \
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*(uint8 *)0)
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#define ntoh_ua(ptr) \
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(sizeof(*(ptr)) == sizeof(uint8) ? *(const uint8 *)(ptr) : \
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sizeof(*(ptr)) == sizeof(uint16) ? _NTOH16_UA((const uint8 *)(ptr)) : \
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sizeof(*(ptr)) == sizeof(uint32) ? _NTOH32_UA((const uint8 *)(ptr)) : \
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*(uint8 *)0)
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#ifdef __GNUC__
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/* GNU macro versions avoid referencing the argument multiple times, while also
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* avoiding the -fno-inline used in ROM builds.
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*/
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#define bcmswap16(val) ({ \
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uint16 _val = (val); \
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BCMSWAP16(_val); \
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})
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#define bcmswap32(val) ({ \
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uint32 _val = (val); \
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BCMSWAP32(_val); \
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})
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#define bcmswap32by16(val) ({ \
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uint32 _val = (val); \
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BCMSWAP32BY16(_val); \
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})
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#define bcmswap16_buf(buf, len) ({ \
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uint16 *_buf = (uint16 *)(buf); \
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uint _wds = (len) / 2; \
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while (_wds--) { \
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*_buf = bcmswap16(*_buf); \
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_buf++; \
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} \
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})
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#define htol16_ua_store(val, bytes) ({ \
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uint16 _val = (val); \
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uint8 *_bytes = (uint8 *)(bytes); \
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_bytes[0] = _val & 0xff; \
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_bytes[1] = _val >> 8; \
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})
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#define htol32_ua_store(val, bytes) ({ \
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uint32 _val = (val); \
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uint8 *_bytes = (uint8 *)(bytes); \
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_bytes[0] = _val & 0xff; \
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_bytes[1] = (_val >> 8) & 0xff; \
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_bytes[2] = (_val >> 16) & 0xff; \
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_bytes[3] = _val >> 24; \
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})
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#define hton16_ua_store(val, bytes) ({ \
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uint16 _val = (val); \
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uint8 *_bytes = (uint8 *)(bytes); \
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_bytes[0] = _val >> 8; \
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_bytes[1] = _val & 0xff; \
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})
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#define hton32_ua_store(val, bytes) ({ \
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uint32 _val = (val); \
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uint8 *_bytes = (uint8 *)(bytes); \
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_bytes[0] = _val >> 24; \
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_bytes[1] = (_val >> 16) & 0xff; \
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_bytes[2] = (_val >> 8) & 0xff; \
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_bytes[3] = _val & 0xff; \
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})
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#define ltoh16_ua(bytes) ({ \
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const uint8 *_bytes = (const uint8 *)(bytes); \
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_LTOH16_UA(_bytes); \
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})
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#define ltoh32_ua(bytes) ({ \
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const uint8 *_bytes = (const uint8 *)(bytes); \
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_LTOH32_UA(_bytes); \
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})
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#define ntoh16_ua(bytes) ({ \
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const uint8 *_bytes = (const uint8 *)(bytes); \
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_NTOH16_UA(_bytes); \
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})
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#define ntoh32_ua(bytes) ({ \
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const uint8 *_bytes = (const uint8 *)(bytes); \
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_NTOH32_UA(_bytes); \
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})
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#else /* !__GNUC__ */
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/* Inline versions avoid referencing the argument multiple times */
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static INLINE uint16
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bcmswap16(uint16 val)
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{
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return BCMSWAP16(val);
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}
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static INLINE uint32
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bcmswap32(uint32 val)
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{
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return BCMSWAP32(val);
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}
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static INLINE uint32
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bcmswap32by16(uint32 val)
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{
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return BCMSWAP32BY16(val);
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}
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/* Reverse pairs of bytes in a buffer (not for high-performance use) */
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/* buf - start of buffer of shorts to swap */
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/* len - byte length of buffer */
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static INLINE void
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bcmswap16_buf(uint16 *buf, uint len)
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{
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len = len / 2;
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while (len--) {
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*buf = bcmswap16(*buf);
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buf++;
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}
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}
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/*
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* Store 16-bit value to unaligned little-endian byte array.
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*/
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static INLINE void
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htol16_ua_store(uint16 val, uint8 *bytes)
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{
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bytes[0] = val & 0xff;
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bytes[1] = val >> 8;
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}
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/*
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* Store 32-bit value to unaligned little-endian byte array.
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*/
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static INLINE void
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htol32_ua_store(uint32 val, uint8 *bytes)
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{
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bytes[0] = val & 0xff;
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bytes[1] = (val >> 8) & 0xff;
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bytes[2] = (val >> 16) & 0xff;
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bytes[3] = val >> 24;
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}
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/*
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* Store 16-bit value to unaligned network-(big-)endian byte array.
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*/
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static INLINE void
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hton16_ua_store(uint16 val, uint8 *bytes)
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{
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bytes[0] = val >> 8;
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bytes[1] = val & 0xff;
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}
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/*
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* Store 32-bit value to unaligned network-(big-)endian byte array.
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*/
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static INLINE void
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hton32_ua_store(uint32 val, uint8 *bytes)
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{
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bytes[0] = val >> 24;
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bytes[1] = (val >> 16) & 0xff;
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bytes[2] = (val >> 8) & 0xff;
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bytes[3] = val & 0xff;
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}
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/*
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* Load 16-bit value from unaligned little-endian byte array.
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*/
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static INLINE uint16
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ltoh16_ua(const void *bytes)
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{
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return _LTOH16_UA((const uint8 *)bytes);
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}
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/*
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* Load 32-bit value from unaligned little-endian byte array.
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*/
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static INLINE uint32
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ltoh32_ua(const void *bytes)
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{
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return _LTOH32_UA((const uint8 *)bytes);
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}
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/*
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* Load 16-bit value from unaligned big-(network-)endian byte array.
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*/
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static INLINE uint16
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ntoh16_ua(const void *bytes)
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{
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return _NTOH16_UA((const uint8 *)bytes);
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}
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/*
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* Load 32-bit value from unaligned big-(network-)endian byte array.
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*/
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static INLINE uint32
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ntoh32_ua(const void *bytes)
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{
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return _NTOH32_UA((const uint8 *)bytes);
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}
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#endif /* !__GNUC__ */
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#endif /* !_BCMENDIAN_H_ */
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