root / lab4 / .minix-src / include / i386 / byte_swap.h @ 14
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| 1 | 13 | up20180614 | /* $NetBSD: byte_swap.h,v 1.15 2008/04/28 20:23:24 martin Exp $ */
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| 2 | |||
| 3 | /*-
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| 4 | * Copyright (c) 1998 The NetBSD Foundation, Inc.
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| 5 | * All rights reserved.
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| 6 | *
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| 7 | * This code is derived from software contributed to The NetBSD Foundation
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| 8 | * by Charles M. Hannum.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without
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| 11 | * modification, are permitted provided that the following conditions
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| 12 | * are met:
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| 13 | * 1. Redistributions of source code must retain the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright
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| 16 | * notice, this list of conditions and the following disclaimer in the
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| 17 | * documentation and/or other materials provided with the distribution.
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| 18 | *
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| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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| 29 | * POSSIBILITY OF SUCH DAMAGE.
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| 30 | */
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| 31 | |||
| 32 | #ifndef _I386_BYTE_SWAP_H_
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| 33 | #define _I386_BYTE_SWAP_H_
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| 34 | |||
| 35 | #include <sys/types.h> |
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| 36 | |||
| 37 | #ifdef __GNUC__
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| 38 | __BEGIN_DECLS |
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| 39 | |||
| 40 | #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
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| 41 | static __inline uint32_t __byte_swap_u32_variable(uint32_t);
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| 42 | static __inline uint32_t
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| 43 | __byte_swap_u32_variable(uint32_t x) |
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| 44 | {
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| 45 | __asm volatile (
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| 46 | "bswap %1"
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| 47 | : "=r" (x) : "0" (x)); |
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| 48 | return (x);
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| 49 | } |
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| 50 | |||
| 51 | #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
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| 52 | static __inline uint16_t __byte_swap_u16_variable(uint16_t);
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| 53 | static __inline uint16_t
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| 54 | __byte_swap_u16_variable(uint16_t x) |
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| 55 | {
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| 56 | __asm volatile ("rorw $8, %w1" : "=r" (x) : "0" (x)); |
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| 57 | return (x);
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| 58 | } |
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| 59 | |||
| 60 | __END_DECLS |
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| 61 | #elif defined(_KERNEL) || defined(_LKM)
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| 62 | #define __BYTE_SWAP_U32_VARIABLE __byte_swap_u32_variable
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| 63 | #define __BYTE_SWAP_U16_VARIABLE __byte_swap_u16_variable
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| 64 | uint32_t __byte_swap_u32_variable(uint32_t); |
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| 65 | uint16_t __byte_swap_u16_variable(uint16_t); |
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| 66 | #endif
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| 67 | |||
| 68 | #endif /* !_I386_BYTE_SWAP_H_ */ |