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 
__arch_swab16(__u16 x)21 static 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 
__arch_swab32(__u32 x)35 static 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
__arch_swab64(__u64 x)55 static 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