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
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
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
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
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