tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 */