310 lines
8.7 KiB
C
310 lines
8.7 KiB
C
/** @file
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* @brief Byte order helpers.
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*/
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/*
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* Copyright (c) 2015-2016, Intel Corporation.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef __BYTEORDER_H__
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#define __BYTEORDER_H__
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#include <zephyr/types.h>
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#include <stddef.h>
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#include <misc/__assert.h>
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/* Internal helpers only used by the sys_* APIs further below */
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#define __bswap_16(x) ((u16_t) ((((x) >> 8) & 0xff) | (((x) & 0xff) << 8)))
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#define __bswap_32(x) ((u32_t) ((((x) >> 24) & 0xff) | \
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(((x) >> 8) & 0xff00) | \
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(((x) & 0xff00) << 8) | \
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(((x) & 0xff) << 24)))
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/** @def sys_le16_to_cpu
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* @brief Convert 16-bit integer from little-endian to host endianness.
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*
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* @param val 16-bit integer in little-endian format.
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*
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* @return 16-bit integer in host endianness.
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*/
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/** @def sys_cpu_to_le16
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* @brief Convert 16-bit integer from host endianness to little-endian.
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*
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* @param val 16-bit integer in host endianness.
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*
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* @return 16-bit integer in little-endian format.
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*/
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/** @def sys_be16_to_cpu
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* @brief Convert 16-bit integer from big-endian to host endianness.
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*
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* @param val 16-bit integer in big-endian format.
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*
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* @return 16-bit integer in host endianness.
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*/
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/** @def sys_cpu_to_be16
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* @brief Convert 16-bit integer from host endianness to big-endian.
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*
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* @param val 16-bit integer in host endianness.
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*
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* @return 16-bit integer in big-endian format.
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*/
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/** @def sys_le32_to_cpu
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* @brief Convert 32-bit integer from little-endian to host endianness.
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*
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* @param val 32-bit integer in little-endian format.
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*
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* @return 32-bit integer in host endianness.
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*/
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/** @def sys_cpu_to_le32
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* @brief Convert 32-bit integer from host endianness to little-endian.
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*
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* @param val 32-bit integer in host endianness.
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*
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* @return 32-bit integer in little-endian format.
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*/
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/** @def sys_be32_to_cpu
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* @brief Convert 32-bit integer from big-endian to host endianness.
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*
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* @param val 32-bit integer in big-endian format.
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*
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* @return 32-bit integer in host endianness.
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*/
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/** @def sys_cpu_to_be32
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* @brief Convert 32-bit integer from host endianness to big-endian.
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*
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* @param val 32-bit integer in host endianness.
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*
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* @return 32-bit integer in big-endian format.
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*/
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define sys_le16_to_cpu(val) (val)
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#define sys_cpu_to_le16(val) (val)
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#define sys_be16_to_cpu(val) __bswap_16(val)
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#define sys_cpu_to_be16(val) __bswap_16(val)
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#define sys_le32_to_cpu(val) (val)
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#define sys_cpu_to_le32(val) (val)
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#define sys_be32_to_cpu(val) __bswap_32(val)
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#define sys_cpu_to_be32(val) __bswap_32(val)
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define sys_le16_to_cpu(val) __bswap_16(val)
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#define sys_cpu_to_le16(val) __bswap_16(val)
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#define sys_be16_to_cpu(val) (val)
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#define sys_cpu_to_be16(val) (val)
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#define sys_le32_to_cpu(val) __bswap_32(val)
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#define sys_cpu_to_le32(val) __bswap_32(val)
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#define sys_be32_to_cpu(val) (val)
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#define sys_cpu_to_be32(val) (val)
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#else
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#error "Unknown byte order"
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#endif
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/**
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* @brief Put a 16-bit integer as big-endian to arbitrary location.
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*
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* Put a 16-bit integer, originally in host endianness, to a
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* potentially unaligned memory location in big-endian format.
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*
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* @param val 16-bit integer in host endianness.
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* @param dst Destination memory address to store the result.
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*/
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static inline void sys_put_be16(u16_t val, u8_t dst[2])
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{
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dst[0] = val >> 8;
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dst[1] = val;
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}
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/**
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* @brief Put a 32-bit integer as big-endian to arbitrary location.
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*
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* Put a 32-bit integer, originally in host endianness, to a
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* potentially unaligned memory location in big-endian format.
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*
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* @param val 32-bit integer in host endianness.
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* @param dst Destination memory address to store the result.
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*/
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static inline void sys_put_be32(u32_t val, u8_t dst[4])
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{
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sys_put_be16(val >> 16, dst);
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sys_put_be16(val, &dst[2]);
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}
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/**
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* @brief Put a 16-bit integer as little-endian to arbitrary location.
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*
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* Put a 16-bit integer, originally in host endianness, to a
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* potentially unaligned memory location in little-endian format.
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*
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* @param val 16-bit integer in host endianness.
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* @param dst Destination memory address to store the result.
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*/
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static inline void sys_put_le16(u16_t val, u8_t dst[2])
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{
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dst[0] = val;
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dst[1] = val >> 8;
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}
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/**
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* @brief Put a 32-bit integer as little-endian to arbitrary location.
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*
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* Put a 32-bit integer, originally in host endianness, to a
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* potentially unaligned memory location in little-endian format.
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*
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* @param val 32-bit integer in host endianness.
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* @param dst Destination memory address to store the result.
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*/
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static inline void sys_put_le32(u32_t val, u8_t dst[4])
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{
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sys_put_le16(val, dst);
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sys_put_le16(val >> 16, &dst[2]);
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}
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/**
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* @brief Put a 64-bit integer as little-endian to arbitrary location.
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*
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* Put a 64-bit integer, originally in host endianness, to a
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* potentially unaligned memory location in little-endian format.
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*
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* @param val 64-bit integer in host endianness.
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* @param dst Destination memory address to store the result.
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*/
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static inline void sys_put_le64(u64_t val, u8_t dst[8])
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{
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sys_put_le32(val, dst);
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sys_put_le32(val >> 32, &dst[4]);
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}
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/**
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* @brief Get a 16-bit integer stored in big-endian format.
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*
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* Get a 16-bit integer, stored in big-endian format in a potentially
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* unaligned memory location, and convert it to the host endianness.
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*
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* @param src Location of the big-endian 16-bit integer to get.
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*
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* @return 16-bit integer in host endianness.
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*/
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static inline u16_t sys_get_be16(const u8_t src[2])
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{
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return ((u16_t)src[0] << 8) | src[1];
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}
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/**
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* @brief Get a 32-bit integer stored in big-endian format.
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*
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* Get a 32-bit integer, stored in big-endian format in a potentially
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* unaligned memory location, and convert it to the host endianness.
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*
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* @param src Location of the big-endian 32-bit integer to get.
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*
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* @return 32-bit integer in host endianness.
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*/
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static inline u32_t sys_get_be32(const u8_t src[4])
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{
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return ((u32_t)sys_get_be16(&src[0]) << 16) | sys_get_be16(&src[2]);
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}
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/**
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* @brief Get a 16-bit integer stored in little-endian format.
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*
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* Get a 16-bit integer, stored in little-endian format in a potentially
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* unaligned memory location, and convert it to the host endianness.
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*
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* @param src Location of the little-endian 16-bit integer to get.
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*
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* @return 16-bit integer in host endianness.
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*/
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static inline u16_t sys_get_le16(const u8_t src[2])
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{
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return ((u16_t)src[1] << 8) | src[0];
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}
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/**
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* @brief Get a 32-bit integer stored in little-endian format.
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*
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* Get a 32-bit integer, stored in little-endian format in a potentially
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* unaligned memory location, and convert it to the host endianness.
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*
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* @param src Location of the little-endian 32-bit integer to get.
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*
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* @return 32-bit integer in host endianness.
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*/
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static inline u32_t sys_get_le32(const u8_t src[4])
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{
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return ((u32_t)sys_get_le16(&src[2]) << 16) | sys_get_le16(&src[0]);
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}
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/**
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* @brief Get a 64-bit integer stored in little-endian format.
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*
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* Get a 64-bit integer, stored in little-endian format in a potentially
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* unaligned memory location, and convert it to the host endianness.
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*
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* @param src Location of the little-endian 64-bit integer to get.
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*
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* @return 64-bit integer in host endianness.
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*/
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static inline u64_t sys_get_le64(const u8_t src[8])
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{
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return ((u64_t)sys_get_le32(&src[4]) << 32) | sys_get_le32(&src[0]);
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}
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/**
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* @brief Swap one buffer content into another
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*
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* Copy the content of src buffer into dst buffer in reversed order,
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* i.e.: src[n] will be put in dst[end-n]
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* Where n is an index and 'end' the last index in both arrays.
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* The 2 memory pointers must be pointing to different areas, and have
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* a minimum size of given length.
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*
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* @param dst A valid pointer on a memory area where to copy the data in
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* @param src A valid pointer on a memory area where to copy the data from
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* @param length Size of both dst and src memory areas
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*/
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static inline void sys_memcpy_swap(void *dst, const void *src, size_t length)
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{
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__ASSERT(((src < dst && (src + length) <= dst) ||
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(src > dst && (dst + length) <= src)),
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"Source and destination buffers must not overlap");
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src += length - 1;
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for (; length > 0; length--) {
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*((u8_t *)dst++) = *((u8_t *)src--);
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}
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}
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/**
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* @brief Swap buffer content
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*
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* In-place memory swap, where final content will be reversed.
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* I.e.: buf[n] will be put in buf[end-n]
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* Where n is an index and 'end' the last index of buf.
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*
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* @param buf A valid pointer on a memory area to swap
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* @param length Size of buf memory area
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*/
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static inline void sys_mem_swap(void *buf, size_t length)
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{
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size_t i;
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for (i = 0; i < (length/2); i++) {
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u8_t tmp = ((u8_t *)buf)[i];
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((u8_t *)buf)[i] = ((u8_t *)buf)[length - 1 - i];
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((u8_t *)buf)[length - 1 - i] = tmp;
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}
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}
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#endif /* __BYTEORDER_H__ */
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