1*1990f7e4Schristos /* $NetBSD: byte_swap.h,v 1.12 2017/01/14 16:21:28 christos Exp $ */
2dc306354Sbouyer
3dc306354Sbouyer /*
4dc306354Sbouyer * Copyright (c) 1987, 1991 Regents of the University of California.
5dc306354Sbouyer * All rights reserved.
6dc306354Sbouyer *
7dc306354Sbouyer * Redistribution and use in source and binary forms, with or without
8dc306354Sbouyer * modification, are permitted provided that the following conditions
9dc306354Sbouyer * are met:
10dc306354Sbouyer * 1. Redistributions of source code must retain the above copyright
11dc306354Sbouyer * notice, this list of conditions and the following disclaimer.
12dc306354Sbouyer * 2. Redistributions in binary form must reproduce the above copyright
13dc306354Sbouyer * notice, this list of conditions and the following disclaimer in the
14dc306354Sbouyer * documentation and/or other materials provided with the distribution.
15aad01611Sagc * 3. Neither the name of the University nor the names of its contributors
16dc306354Sbouyer * may be used to endorse or promote products derived from this software
17dc306354Sbouyer * without specific prior written permission.
18dc306354Sbouyer *
19dc306354Sbouyer * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20dc306354Sbouyer * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21dc306354Sbouyer * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22dc306354Sbouyer * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23dc306354Sbouyer * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24dc306354Sbouyer * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25dc306354Sbouyer * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26dc306354Sbouyer * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27dc306354Sbouyer * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28dc306354Sbouyer * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29dc306354Sbouyer * SUCH DAMAGE.
30dc306354Sbouyer *
31dc306354Sbouyer * @(#)endian.h 7.8 (Berkeley) 4/3/91
32dc306354Sbouyer */
33dc306354Sbouyer
34dc306354Sbouyer #ifndef _VAX_BYTE_SWAP_H_
35dc306354Sbouyer #define _VAX_BYTE_SWAP_H_
3621650978Sskrll
37c88ae1f9Sdsl #ifdef __GNUC__
38c88ae1f9Sdsl #include <sys/types.h>
39c88ae1f9Sdsl __BEGIN_DECLS
40dc306354Sbouyer
41c88ae1f9Sdsl #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
42e7b322a5Sperry static __inline uint32_t __attribute__((__unused__))
__byte_swap_u32_variable(uint32_t x)43c88ae1f9Sdsl __byte_swap_u32_variable(uint32_t x)
442494c460Sthorpej {
452494c460Sthorpej uint32_t y;
46dc306354Sbouyer
475f1c88d7Sperry __asm volatile(
482494c460Sthorpej "rotl $-8, %1, %0 \n"
492494c460Sthorpej "insv %0, $16, $8, %0 \n"
5028b1aa2bSmatt "rotl $8, %1, %%r1 \n"
5128b1aa2bSmatt "movb %%r1, %0"
522494c460Sthorpej : "=&r" (y)
532494c460Sthorpej : "r" (x)
542494c460Sthorpej : "r1", "cc");
552494c460Sthorpej
562494c460Sthorpej return (y);
572494c460Sthorpej }
582494c460Sthorpej
59c88ae1f9Sdsl #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
60e7b322a5Sperry static __inline uint16_t __attribute__((__unused__))
__byte_swap_u16_variable(uint16_t x)61c88ae1f9Sdsl __byte_swap_u16_variable(uint16_t x)
622494c460Sthorpej {
632494c460Sthorpej
64*1990f7e4Schristos return (uint16_t)(x << 8 | x >> 8);
652494c460Sthorpej }
66dc306354Sbouyer
67c88ae1f9Sdsl __END_DECLS
68c88ae1f9Sdsl #endif
69dc306354Sbouyer #endif /* _VAX_BYTE_SWAP_H_ */
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