1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2/*
3 * This file is subject to the terms and conditions of the GNU General Public
4 * License.  See the file "COPYING" in the main directory of this archive
5 * for more details.
6 *
7 * Copyright (C) 1996, 99, 2003 by Ralf Baechle
8 */
9#ifndef _ASM_SWAB_H
10#define _ASM_SWAB_H
11
12#include <linux/compiler.h>
13#include <linux/types.h>
14
15#define __SWAB_64_THRU_32__
16
17#if !defined(__mips16) &&					\
18	((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||	\
19	 defined(_MIPS_ARCH_LOONGSON3A))
20
21static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
22{
23	__asm__(
24	"	.set	push			\n"
25	"	.set	arch=mips32r2		\n"
26	"	wsbh	%0, %1			\n"
27	"	.set	pop			\n"
28	: "=r" (x)
29	: "r" (x));
30
31	return x;
32}
33#define __arch_swab16 __arch_swab16
34
35static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
36{
37	__asm__(
38	"	.set	push			\n"
39	"	.set	arch=mips32r2		\n"
40	"	wsbh	%0, %1			\n"
41	"	rotr	%0, %0, 16		\n"
42	"	.set	pop			\n"
43	: "=r" (x)
44	: "r" (x));
45
46	return x;
47}
48#define __arch_swab32 __arch_swab32
49
50/*
51 * Having already checked for MIPS R2, enable the optimized version for
52 * 64-bit kernel on r2 CPUs.
53 */
54#ifdef __mips64
55static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
56{
57	__asm__(
58	"	.set	push			\n"
59	"	.set	arch=mips64r2		\n"
60	"	dsbh	%0, %1			\n"
61	"	dshd	%0, %0			\n"
62	"	.set	pop			\n"
63	: "=r" (x)
64	: "r" (x));
65
66	return x;
67}
68#define __arch_swab64 __arch_swab64
69#endif /* __mips64 */
70#endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */
71#endif /* _ASM_SWAB_H */
72