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Diffstat (limited to 'include/lib/stdlib/machine/endian.h')
| -rw-r--r-- | include/lib/stdlib/machine/endian.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/include/lib/stdlib/machine/endian.h b/include/lib/stdlib/machine/endian.h new file mode 100644 index 00000000..a6a0cb76 --- /dev/null +++ b/include/lib/stdlib/machine/endian.h @@ -0,0 +1,122 @@ +/*- + * Copyright (c) 2001 David E. O'Brien + * + * 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. + * 3. 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 8.1 (Berkeley) 6/10/93 + * $NetBSD: endian.h,v 1.7 1999/08/21 05:53:51 simonb Exp $ + * $FreeBSD$ + */ + +#ifndef _MACHINE_ENDIAN_H_ +#define _MACHINE_ENDIAN_H_ + +#include <sys/_types.h> + +/* + * 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 + +#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 _QUAD_HIGHWORD 1 +#define _QUAD_LOWWORD 0 +#define __ntohl(x) (__bswap32(x)) +#define __ntohs(x) (__bswap16(x)) +#define __htonl(x) (__bswap32(x)) +#define __htons(x) (__bswap16(x)) + +static __inline __uint64_t +__bswap64(__uint64_t x) +{ + __uint64_t ret; + + __asm __volatile("rev %0, %1\n" + : "=&r" (ret), "+r" (x)); + + return (ret); +} + +static __inline __uint32_t +__bswap32_var(__uint32_t v) +{ + __uint32_t ret; + + __asm __volatile("rev32 %x0, %x1\n" + : "=&r" (ret), "+r" (v)); + + return (ret); +} + +static __inline __uint16_t +__bswap16_var(__uint16_t v) +{ + __uint32_t ret; + + __asm __volatile("rev16 %w0, %w1\n" + : "=&r" (ret), "+r" (v)); + + return ((__uint16_t)ret); +} + +#ifdef __OPTIMIZE__ + +#define __bswap32_constant(x) \ + ((((x) & 0xff000000U) >> 24) | \ + (((x) & 0x00ff0000U) >> 8) | \ + (((x) & 0x0000ff00U) << 8) | \ + (((x) & 0x000000ffU) << 24)) + +#define __bswap16_constant(x) \ + ((((x) & 0xff00) >> 8) | \ + (((x) & 0x00ff) << 8)) + +#define __bswap16(x) \ + ((__uint16_t)(__builtin_constant_p(x) ? \ + __bswap16_constant(x) : \ + __bswap16_var(x))) + +#define __bswap32(x) \ + ((__uint32_t)(__builtin_constant_p(x) ? \ + __bswap32_constant(x) : \ + __bswap32_var(x))) + +#else +#define __bswap16(x) __bswap16_var(x) +#define __bswap32(x) __bswap32_var(x) + +#endif /* __OPTIMIZE__ */ +#endif /* !_MACHINE_ENDIAN_H_ */ |