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Diffstat (limited to 'usr/src/boot/sys/x86/include/endian.h')
| -rw-r--r-- | usr/src/boot/sys/x86/include/endian.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/usr/src/boot/sys/x86/include/endian.h b/usr/src/boot/sys/x86/include/endian.h new file mode 100644 index 0000000000..6ca6a6cf1c --- /dev/null +++ b/usr/src/boot/sys/x86/include/endian.h @@ -0,0 +1,131 @@ +/*- + * Copyright (c) 1987, 1991 Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)endian.h 7.8 (Berkeley) 4/3/91 + * $FreeBSD$ + */ + +#ifndef _MACHINE_ENDIAN_H_ +#define _MACHINE_ENDIAN_H_ + +#include <sys/cdefs.h> +#include <sys/_types.h> + +/* + * Define the order of 32-bit words in 64-bit words. + */ +#define _QUAD_HIGHWORD 1 +#define _QUAD_LOWWORD 0 + +/* + * Definitions for byte order, according to byte significance from low + * address to high. + */ +#define _LITTLE_ENDIAN 1234 /* LSB first: i386, vax */ +#define _BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */ +#define _PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */ + +#define _BYTE_ORDER _LITTLE_ENDIAN + +/* + * Deprecated variants that don't have enough underscores to be useful in more + * strict namespaces. + */ +#if __BSD_VISIBLE +#define LITTLE_ENDIAN _LITTLE_ENDIAN +#define BIG_ENDIAN _BIG_ENDIAN +#define PDP_ENDIAN _PDP_ENDIAN +#define BYTE_ORDER _BYTE_ORDER +#endif + +#define __bswap16_gen(x) (__uint16_t)((x) << 8 | (x) >> 8) +#define __bswap32_gen(x) \ + (((__uint32_t)__bswap16((x) & 0xffff) << 16) | __bswap16((x) >> 16)) +#define __bswap64_gen(x) \ + (((__uint64_t)__bswap32((x) & 0xffffffff) << 32) | __bswap32((x) >> 32)) + +#ifdef __GNUCLIKE_BUILTIN_CONSTANT_P +#define __bswap16(x) \ + ((__uint16_t)(__builtin_constant_p(x) ? \ + __bswap16_gen((__uint16_t)(x)) : __bswap16_var(x))) +#define __bswap32(x) \ + (__builtin_constant_p(x) ? \ + __bswap32_gen((__uint32_t)(x)) : __bswap32_var(x)) +#define __bswap64(x) \ + (__builtin_constant_p(x) ? \ + __bswap64_gen((__uint64_t)(x)) : __bswap64_var(x)) +#else +/* XXX these are broken for use in static initializers. */ +#define __bswap16(x) __bswap16_var(x) +#define __bswap32(x) __bswap32_var(x) +#define __bswap64(x) __bswap64_var(x) +#endif + +/* These are defined as functions to avoid multiple evaluation of x. */ + +static __inline __uint16_t +__bswap16_var(__uint16_t _x) +{ + + return (__bswap16_gen(_x)); +} + +static __inline __uint32_t +__bswap32_var(__uint32_t _x) +{ + +#ifdef __GNUCLIKE_ASM + __asm("bswap %0" : "+r" (_x)); + return (_x); +#else + return (__bswap32_gen(_x)); +#endif +} + +static __inline __uint64_t +__bswap64_var(__uint64_t _x) +{ + +#if defined(__amd64__) && defined(__GNUCLIKE_ASM) + __asm("bswap %0" : "+r" (_x)); + return (_x); +#else + /* + * It is important for the optimizations that the following is not + * really generic, but expands to 2 __bswap32_var()'s. + */ + return (__bswap64_gen(_x)); +#endif +} + +#define __htonl(x) __bswap32(x) +#define __htons(x) __bswap16(x) +#define __ntohl(x) __bswap32(x) +#define __ntohs(x) __bswap16(x) + +#endif /* !_MACHINE_ENDIAN_H_ */ |