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gerrit-public.fairphone.software / kernel / msm-4.9 / b20a4615944a0c106fce2aecb7ea1dbc8eefc71b / . / include / asm-x86 / byteorder.h
blob: e02ae2d89acf13936aad26502e485aa6ddae0b65 [file] [log] [blame]
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]1#ifndef _ASM_X86_BYTEORDER_H
2#define _ASM_X86_BYTEORDER_H
3
4#include <asm/types.h>
5#include <linux/compiler.h>
6
7#ifdef __GNUC__
8
9#ifdef __i386__
10
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]11static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]12{
13#ifdef CONFIG_X86_BSWAP
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]14 asm("bswap %0" : "=r" (x) : "0" (x));
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200[diff] [blame]15#else
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]16 asm("xchgb %b0,%h0\n\t" /* swap lower bytes */
17 "rorl $16,%0\n\t" /* swap words */
18 "xchgb %b0,%h0" /* swap higher bytes */
19 : "=q" (x)
20 : "0" (x));
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200[diff] [blame]21#endif
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]22 return x;
23}
24
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]25static inline __attribute_const__ __u64 ___arch__swab64(__u64 val)
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]26{
27 union {
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]28 struct {
29 __u32 a;
30 __u32 b;
31 } s;
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]32 __u64 u;
33 } v;
34 v.u = val;
35#ifdef CONFIG_X86_BSWAP
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]36 asm("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]37 : "=r" (v.s.a), "=r" (v.s.b)
38 : "0" (v.s.a), "1" (v.s.b));
39#else
40 v.s.a = ___arch__swab32(v.s.a);
41 v.s.b = ___arch__swab32(v.s.b);
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]42 asm("xchgl %0,%1"
43 : "=r" (v.s.a), "=r" (v.s.b)
44 : "0" (v.s.a), "1" (v.s.b));
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]45#endif
46 return v.u;
47}
48
49#else /* __i386__ */
50
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]51static inline __attribute_const__ __u64 ___arch__swab64(__u64 x)
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]52{
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]53 asm("bswapq %0"
54 : "=r" (x)
55 : "0" (x));
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]56 return x;
57}
58
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]59static inline __attribute_const__ __u32 ___arch__swab32(__u32 x)
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]60{
Joe Perches34605092008-03-23 01:01:47 -0700[diff] [blame]61 asm("bswapl %0"
62 : "=r" (x)
63 : "0" (x));
Thomas Gleixneracbbbe92007-10-23 22:37:23 +0200[diff] [blame]64 return x;
65}
66
67#endif
68
69/* Do not define swab16. Gcc is smart enough to recognize "C" version and
70 convert it into rotation or exhange. */
71
72#define __arch__swab64(x) ___arch__swab64(x)
73#define __arch__swab32(x) ___arch__swab32(x)
74
75#define __BYTEORDER_HAS_U64__
76
77#endif /* __GNUC__ */
78
79#include <linux/byteorder/little_endian.h>
80
81#endif /* _ASM_X86_BYTEORDER_H */