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#ifdef CONFIG_CPU_MIPSR2
17
18static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
19{
20 __asm__(
21 " wsbh %0, %1 \n"
22 : "=r" (x)
23 : "r" (x));
24
25 return x;
26}
27#define __arch_swab16 __arch_swab16
28
29static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
30{
31 __asm__(
32 " wsbh %0, %1 \n"
33 " rotr %0, %0, 16 \n"
34 : "=r" (x)
35 : "r" (x));
36
37 return x;
38}
39#define __arch_swab32 __arch_swab32
40
41/*
42 * Having already checked for CONFIG_CPU_MIPSR2, enable the
43 * optimized version for 64-bit kernel on r2 CPUs.
44 */
45#ifdef CONFIG_64BIT
46static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
47{
48 __asm__(
49 " dsbh %0, %1\n"
50 " dshd %0, %0"
51 : "=r" (x)
52 : "r" (x));
53
54 return x;
55}
56#define __arch_swab64 __arch_swab64
57#endif /* CONFIG_64BIT */
58#endif /* CONFIG_CPU_MIPSR2 */
59#endif /* _ASM_SWAB_H */