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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/mips/include/uapi/asm/swab.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file "COPYING" in the main directory of this archive

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 * for more details.

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 *

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 * Copyright (C) 1996, 99, 2003 by Ralf Baechle

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 */

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#ifndef _ASM_SWAB_H

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#define _ASM_SWAB_H

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#include <linux/compiler.h>

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#include <linux/types.h>

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#define __SWAB_64_THRU_32__

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#if !defined(__mips16) &&					\

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	((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||	\

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	 defined(_MIPS_ARCH_LOONGSON3A))

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static inline __attribute_const__ __u16 __arch_swab16(__u16 x)

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{

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	__asm__(

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	"	.set	push			\n"

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	"	.set	arch=mips32r2		\n"

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	"	wsbh	%0, %1			\n"

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	"	.set	pop			\n"

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	: "=r" (x)

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	: "r" (x));

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	return x;

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}

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#define __arch_swab16 __arch_swab16

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static inline __attribute_const__ __u32 __arch_swab32(__u32 x)

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{

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	__asm__(

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	"	.set	push			\n"

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	"	.set	arch=mips32r2		\n"

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	"	wsbh	%0, %1			\n"

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	"	rotr	%0, %0, 16		\n"

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	"	.set	pop			\n"

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	: "=r" (x)

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	: "r" (x));

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	return x;

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}

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#define __arch_swab32 __arch_swab32

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/*

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 * Having already checked for MIPS R2, enable the optimized version for

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 * 64-bit kernel on r2 CPUs.

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 */

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#ifdef __mips64

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static inline __attribute_const__ __u64 __arch_swab64(__u64 x)

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{

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	__asm__(

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	"	.set	push			\n"

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	"	.set	arch=mips64r2		\n"

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	"	dsbh	%0, %1			\n"

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	"	dshd	%0, %0			\n"

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	"	.set	pop			\n"

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	: "=r" (x)

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	: "r" (x));

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	return x;

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}

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#define __arch_swab64 __arch_swab64

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#endif /* __mips64 */

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#endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */

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#endif /* _ASM_SWAB_H */

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