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