1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1996, 99, 2003 by Ralf Baechle
7 */
8#ifndef _ASM_SWAB_H
9#define _ASM_SWAB_H
10
11#include <linux/compiler.h>
12#include <linux/types.h>
13
14#define __SWAB_64_THRU_32__
15
16#if (defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||		\
17    defined(_MIPS_ARCH_LOONGSON3A)
18
19static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
20{
21	__asm__(
22	"	.set	push			\n"
23	"	.set	arch=mips32r2		\n"
24	"	wsbh	%0, %1			\n"
25	"	.set	pop			\n"
26	: "=r" (x)
27	: "r" (x));
28
29	return x;
30}
31#define __arch_swab16 __arch_swab16
32
33static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
34{
35	__asm__(
36	"	.set	push			\n"
37	"	.set	arch=mips32r2		\n"
38	"	wsbh	%0, %1			\n"
39	"	rotr	%0, %0, 16		\n"
40	"	.set	pop			\n"
41	: "=r" (x)
42	: "r" (x));
43
44	return x;
45}
46#define __arch_swab32 __arch_swab32
47
48/*
49 * Having already checked for MIPS R2, enable the optimized version for
50 * 64-bit kernel on r2 CPUs.
51 */
52#ifdef __mips64
53static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
54{
55	__asm__(
56	"	.set	push			\n"
57	"	.set	arch=mips64r2		\n"
58	"	dsbh	%0, %1			\n"
59	"	dshd	%0, %0			\n"
60	"	.set	pop			\n"
61	: "=r" (x)
62	: "r" (x));
63
64	return x;
65}
66#define __arch_swab64 __arch_swab64
67#endif /* __mips64 */
68#endif /* MIPS R2 or newer or Loongson 3A */
69#endif /* _ASM_SWAB_H */
70