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(__mips16) &&					\
17	((defined(__mips_isa_rev) && (__mips_isa_rev >= 2)) ||	\
18	 defined(_MIPS_ARCH_LOONGSON3A))
19
20static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
21{
22	__asm__(
23	"	.set	push			\n"
24	"	.set	arch=mips32r2		\n"
25	"	wsbh	%0, %1			\n"
26	"	.set	pop			\n"
27	: "=r" (x)
28	: "r" (x));
29
30	return x;
31}
32#define __arch_swab16 __arch_swab16
33
34static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
35{
36	__asm__(
37	"	.set	push			\n"
38	"	.set	arch=mips32r2		\n"
39	"	wsbh	%0, %1			\n"
40	"	rotr	%0, %0, 16		\n"
41	"	.set	pop			\n"
42	: "=r" (x)
43	: "r" (x));
44
45	return x;
46}
47#define __arch_swab32 __arch_swab32
48
49/*
50 * Having already checked for MIPS R2, enable the optimized version for
51 * 64-bit kernel on r2 CPUs.
52 */
53#ifdef __mips64
54static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
55{
56	__asm__(
57	"	.set	push			\n"
58	"	.set	arch=mips64r2		\n"
59	"	dsbh	%0, %1			\n"
60	"	dshd	%0, %0			\n"
61	"	.set	pop			\n"
62	: "=r" (x)
63	: "r" (x));
64
65	return x;
66}
67#define __arch_swab64 __arch_swab64
68#endif /* __mips64 */
69#endif /* (not __mips16) and (MIPS R2 or newer or Loongson 3A) */
70#endif /* _ASM_SWAB_H */
71