mirror of
https://gitlab.rtems.org/rtems/rtos/rtems.git
synced 2026-08-28 00:46:33 +08:00
Add <sys/endian.h>
This commit is contained in:
Sebastian Huber
@@ -61,6 +61,7 @@ include_sys_HEADERS += libcsupport/include/sys/ttycom.h
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include_sys_HEADERS += libcsupport/include/sys/termios.h
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include_sys_HEADERS += libcsupport/include/sys/utsname.h
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include_sys_HEADERS += include/sys/endian.h
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include_sys_HEADERS += include/sys/uio.h
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include_sys_HEADERS += include/sys/_iovec.h
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include_sys_HEADERS += include/sys/priority.h
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@@ -0,0 +1,195 @@
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/*-
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* Copyright (c) 2002 Thomas Moestl <tmm@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _SYS_ENDIAN_H_
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#define _SYS_ENDIAN_H_
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#include <sys/cdefs.h>
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#include <rtems/endian.h>
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/*
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* General byte order swapping functions.
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*/
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#define bswap16(x) CPU_swap_u16(x)
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#define bswap32(x) CPU_swap_u32(x)
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static __inline uint64_t
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bswap64(uint64_t v)
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{
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#ifdef __GNUC__
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return __builtin_bswap64(v);
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#else
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return ((v >> 56) | ((v >> 40) & 0xff00) | ((v >> 24) & 0xff0000) |
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((v >> 8) & 0xff000000) | ((v << 8) & ((uint64_t)0xff << 32)) |
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((v << 24) & ((uint64_t)0xff << 40)) |
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((v << 40) & ((uint64_t)0xff << 48)) | ((v << 56)));
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#endif
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}
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/*
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* Host to big endian, host to little endian, big endian to host, and little
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* endian to host byte order functions as detailed in byteorder(9).
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*/
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define htobe16(x) bswap16((x))
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#define htobe32(x) bswap32((x))
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#define htobe64(x) bswap64((x))
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#define htole16(x) ((uint16_t)(x))
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#define htole32(x) ((uint32_t)(x))
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#define htole64(x) ((uint64_t)(x))
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#define be16toh(x) bswap16((x))
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#define be32toh(x) bswap32((x))
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#define be64toh(x) bswap64((x))
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#define le16toh(x) ((uint16_t)(x))
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#define le32toh(x) ((uint32_t)(x))
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#define le64toh(x) ((uint64_t)(x))
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#else /* BYTE_ORDER != LITTLE_ENDIAN */
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#define htobe16(x) ((uint16_t)(x))
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#define htobe32(x) ((uint32_t)(x))
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#define htobe64(x) ((uint64_t)(x))
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#define htole16(x) bswap16((x))
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#define htole32(x) bswap32((x))
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#define htole64(x) bswap64((x))
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#define be16toh(x) ((uint16_t)(x))
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#define be32toh(x) ((uint32_t)(x))
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#define be64toh(x) ((uint64_t)(x))
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#define le16toh(x) bswap16((x))
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#define le32toh(x) bswap32((x))
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#define le64toh(x) bswap64((x))
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#endif /* BYTE_ORDER == LITTLE_ENDIAN */
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/* Alignment-agnostic encode/decode bytestream to/from little/big endian. */
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static __inline uint16_t
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be16dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return ((p[0] << 8) | p[1]);
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}
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static __inline uint32_t
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be32dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (((unsigned)p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3]);
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}
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static __inline uint64_t
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be64dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (((uint64_t)be32dec(p) << 32) | be32dec(p + 4));
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}
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static __inline uint16_t
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le16dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return ((p[1] << 8) | p[0]);
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}
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static __inline uint32_t
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le32dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (((unsigned)p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]);
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}
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static __inline uint64_t
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le64dec(const void *pp)
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{
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uint8_t const *p = (uint8_t const *)pp;
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return (((uint64_t)le32dec(p + 4) << 32) | le32dec(p));
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}
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static __inline void
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be16enc(void *pp, uint16_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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p[0] = (u >> 8) & 0xff;
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p[1] = u & 0xff;
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}
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static __inline void
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be32enc(void *pp, uint32_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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p[0] = (u >> 24) & 0xff;
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p[1] = (u >> 16) & 0xff;
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p[2] = (u >> 8) & 0xff;
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p[3] = u & 0xff;
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}
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static __inline void
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be64enc(void *pp, uint64_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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be32enc(p, (uint32_t)(u >> 32));
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be32enc(p + 4, (uint32_t)(u & 0xffffffffU));
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}
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static __inline void
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le16enc(void *pp, uint16_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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p[0] = u & 0xff;
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p[1] = (u >> 8) & 0xff;
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}
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static __inline void
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le32enc(void *pp, uint32_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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p[0] = u & 0xff;
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p[1] = (u >> 8) & 0xff;
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p[2] = (u >> 16) & 0xff;
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p[3] = (u >> 24) & 0xff;
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}
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static __inline void
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le64enc(void *pp, uint64_t u)
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{
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uint8_t *p = (uint8_t *)pp;
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le32enc(p, (uint32_t)(u & 0xffffffffU));
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le32enc(p + 4, (uint32_t)(u >> 32));
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}
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#endif /* _SYS_ENDIAN_H_ */
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@@ -103,6 +103,10 @@ $(PROJECT_INCLUDE)/sys/utsname.h: libcsupport/include/sys/utsname.h $(PROJECT_IN
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/utsname.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/utsname.h
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$(PROJECT_INCLUDE)/sys/endian.h: include/sys/endian.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/endian.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/endian.h
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$(PROJECT_INCLUDE)/sys/uio.h: include/sys/uio.h $(PROJECT_INCLUDE)/sys/$(dirstamp)
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$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/sys/uio.h
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PREINSTALL_FILES += $(PROJECT_INCLUDE)/sys/uio.h
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