mirror of
https://github.com/markqvist/OpenModem.git
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261 lines
7.4 KiB
C++
261 lines
7.4 KiB
C++
/**
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* \file
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* <!--
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* This file is part of BeRTOS.
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*
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* Bertos is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* As a special exception, you may use this file as part of a free software
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* library without restriction. Specifically, if other files instantiate
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* templates or use macros or inline functions from this file, or you compile
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* this file and link it with other files to produce an executable, this
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* file does not by itself cause the resulting executable to be covered by
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* the GNU General Public License. This exception does not however
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* invalidate any other reasons why the executable file might be covered by
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* the GNU General Public License.
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*
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* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
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* -->
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*
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* \brief Functions to convert integers to/from host byte-order.
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*
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* \author Bernie Innocenti <bernie@codewiz.org>
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* \author Stefano Fedrigo <aleph@develer.com>
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*/
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#ifndef MWARE_BYTEORDER_H
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#define MWARE_BYTEORDER_H
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#include <cfg/compiler.h>
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#include <cpu/attr.h>
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#include <cpu/detect.h>
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#include <cpu/types.h>
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#include <cfg/macros.h>
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/**
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* Swap upper and lower bytes in a 16-bit value.
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*/
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#define SWAB16(x) ((uint16_t)(ROTR((x), 8) + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
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/*
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* On Cortex-M3, GCC 4.4 builtin implementation is slower than our own
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* rot-based implementation.
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*/
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#if GNUC_PREREQ(4, 3) && !CPU_CM3
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#define SWAB32(x) ((uint32_t)(__builtin_bswap32((x) + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t)))))
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#else
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/**
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* Reverse bytes in a 32-bit value (e.g.: 0x12345678 -> 0x78563412).
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*/
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#define SWAB32(x) ((uint32_t)(( \
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(ROTR(x, 8) & 0xFF00FF00) | \
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(ROTL(x, 8) & 0x00FF00FF))) + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t)))
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#endif
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#if GNUC_PREREQ(4, 3)
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#define SWAB64(x) ((uint64_t)(__builtin_bswap64((x) + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t)))))
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#else
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/**
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* Reverse bytes in a 64-bit value.
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*/
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#define SWAB64(x) ((uint64_t)( \
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(((uint64_t)(x) & (uint64_t)0x00000000000000ffULL) << 56) | \
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(((uint64_t)(x) & (uint64_t)0x000000000000ff00ULL) << 40) | \
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(((uint64_t)(x) & (uint64_t)0x0000000000ff0000ULL) << 24) | \
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(((uint64_t)(x) & (uint64_t)0x00000000ff000000ULL) << 8) | \
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(((uint64_t)(x) & (uint64_t)0x000000ff00000000ULL) >> 8) | \
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(((uint64_t)(x) & (uint64_t)0x0000ff0000000000ULL) >> 24) | \
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(((uint64_t)(x) & (uint64_t)0x00ff000000000000ULL) >> 40) | \
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(((uint64_t)(x) & (uint64_t)0xff00000000000000ULL) >> 56) + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
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#endif
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#if CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN
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#define cpu_to_le16(x) ((uint16_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
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#define cpu_to_le32(x) ((uint32_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
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#define cpu_to_le64(x) ((uint64_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
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#define cpu_to_be16(x) SWAB16(x)
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#define cpu_to_be32(x) SWAB32(x)
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#define cpu_to_be64(x) SWAB64(x)
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#elif CPU_BYTE_ORDER == CPU_BIG_ENDIAN
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#define cpu_to_le16(x) SWAB16(x)
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#define cpu_to_le32(x) SWAB32(x)
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#define cpu_to_le64(x) SWAB64(x)
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#define cpu_to_be16(x) ((uint16_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint16_t))))
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#define cpu_to_be32(x) ((uint32_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint32_t))))
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#define cpu_to_be64(x) ((uint64_t)(x + \
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STATIC_ASSERT_EXPR(sizeof(x) == sizeof(uint64_t))))
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#else
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#error "unrecognized CPU endianness"
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#endif
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#define be16_to_cpu(x) cpu_to_be16(x)
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#define le16_to_cpu(x) cpu_to_le16(x)
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#define be32_to_cpu(x) cpu_to_be32(x)
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#define le32_to_cpu(x) cpu_to_le32(x)
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#define be64_to_cpu(x) cpu_to_be64(x)
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#define le64_to_cpu(x) cpu_to_le64(x)
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#define host_to_net16(x) cpu_to_be16(x)
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#define net_to_host16(x) be16_to_cpu(x)
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#define host_to_net32(x) cpu_to_be32(x)
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#define net_to_host32(x) be32_to_cpu(x)
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#define host_to_net64(x) cpu_to_be64(x)
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#define net_to_host64(x) be64_to_cpu(x)
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/**
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* Reverse bytes in a float value.
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*/
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INLINE float swab_float(float x)
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{
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/* Avoid breaking strict aliasing rules. */
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char *cx = (char *)(&x);
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STATIC_ASSERT(sizeof(float) == 4);
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#define BYTEORDER_SWAP(a, b) do { (a) ^= (b); (b) ^= (a); (a) ^= (b); } while(0)
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BYTEORDER_SWAP(cx[0], cx[3]);
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BYTEORDER_SWAP(cx[1], cx[2]);
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#undef BYTEORDER_SWAP
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return x;
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}
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INLINE float cpu_to_be_float(float x)
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{
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return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab_float(x) : x;
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}
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INLINE float cpu_to_le_float(float x)
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{
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return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab_float(x) : x;
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}
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INLINE float be_float_to_cpu(float x)
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{
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return cpu_to_be_float(x);
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}
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INLINE float le_float_to_cpu(float x)
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{
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return cpu_to_le_float(x);
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}
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INLINE float host_to_net_float(float x)
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{
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return cpu_to_be_float(x);
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}
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INLINE float net_to_host_float(float x)
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{
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return be_float_to_cpu(x);
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}
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#if CPU_ARM
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INLINE cpu_atomic_t
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cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
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{
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cpu_atomic_t ret;
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asm volatile(
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"swp %0, %1, [%2]"
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: "=&r" (ret)
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: "r" (val), "r" (ptr)
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: "memory", "cc");
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return ret;
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}
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#else /* CPU_ARM */
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#include <cpu/irq.h>
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INLINE cpu_atomic_t
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cpu_atomic_xchg(volatile cpu_atomic_t *ptr, cpu_atomic_t val)
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{
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cpu_atomic_t ret;
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ATOMIC(
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ret = *ptr;
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*ptr = val;
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);
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return ret;
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}
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#endif /* CPU_ARM */
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#ifdef __cplusplus
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/// Type generic byte swapping.
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template<typename T>
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INLINE T swab(T x);
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template<> INLINE uint16_t swab(uint16_t x) { return SWAB16(x); }
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template<> INLINE uint32_t swab(uint32_t x) { return SWAB32(x); }
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template<> INLINE uint64_t swab(uint64_t x) { return SWAB64(x); }
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template<> INLINE int16_t swab(int16_t x) { return static_cast<int16_t>(SWAB16(static_cast<uint16_t>(x))); }
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template<> INLINE int32_t swab(int32_t x) { return static_cast<int32_t>(SWAB32(static_cast<uint32_t>(x))); }
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template<> INLINE int64_t swab(int64_t x) { return static_cast<int64_t>(SWAB64(static_cast<uint64_t>(x))); }
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template<> INLINE float swab(float x) { return swab_float(x); }
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/// Type generic conversion from CPU byte order to big-endian byte order.
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template<typename T>
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INLINE T cpu_to_be(T x)
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{
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return (CPU_BYTE_ORDER == CPU_LITTLE_ENDIAN) ? swab(x) : x;
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}
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/// Type generic conversion from CPU byte-order to little-endian.
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template<typename T>
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INLINE T cpu_to_le(T x)
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{
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return (CPU_BYTE_ORDER == CPU_BIG_ENDIAN) ? swab(x) : x;
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}
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/// Type generic conversion from big endian byte-order to CPU byte order.
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template<typename T>
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INLINE T be_to_cpu(T x)
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{
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return cpu_to_be(x);
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}
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/// Type generic conversion from little-endian byte order to CPU byte order.
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template<typename T>
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INLINE T le_to_cpu(T x)
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{
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return cpu_to_le(x);
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}
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/// Type generic conversion from network byte order to host byte order.
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template<typename T>
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INLINE T net_to_host(T x)
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{
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return be_to_cpu(x);
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}
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/// Type generic conversion from host byte order to network byte order.
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template<typename T>
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INLINE T host_to_net(T x)
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{
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return net_to_host(x);
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}
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#endif /* __cplusplus */
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#endif /* MWARE_BYTEORDER_H */
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