1 #ifndef __BYTEORDER_H
2 #define __BYTEORDER_H
3 
4 #include "types.h" // u32
5 
__swab16_constant(u16 val)6 static inline u16 __swab16_constant(u16 val) {
7     return (val<<8) | (val>>8);
8 }
__swab32_constant(u32 val)9 static inline u32 __swab32_constant(u32 val) {
10     return (val<<24) | ((val&0xff00)<<8) | ((val&0xff0000)>>8) | (val>>24);
11 }
__swab64_constant(u64 val)12 static inline u64 __swab64_constant(u64 val) {
13     return ((u64)__swab32_constant(val) << 32) | __swab32_constant(val>>32);
14 }
__swab32(u32 val)15 static inline u32 __swab32(u32 val) {
16     asm("bswapl %0" : "+r"(val));
17     return val;
18 }
__swab64(u64 val)19 static inline u64 __swab64(u64 val) {
20     union u64_u32_u i, o;
21     i.val = val;
22     o.lo = __swab32(i.hi);
23     o.hi = __swab32(i.lo);
24     return o.val;
25 }
26 
27 #define swab16(x) __swab16_constant(x)
28 #define swab32(x) (__builtin_constant_p((u32)(x)) \
29                    ? __swab32_constant(x) : __swab32(x))
30 #define swab64(x) (__builtin_constant_p((u64)(x)) \
31                    ? __swab64_constant(x) : __swab64(x))
32 
cpu_to_le16(u16 x)33 static inline u16 cpu_to_le16(u16 x) {
34     return x;
35 }
cpu_to_le32(u32 x)36 static inline u32 cpu_to_le32(u32 x) {
37     return x;
38 }
cpu_to_le64(u64 x)39 static inline u64 cpu_to_le64(u64 x) {
40     return x;
41 }
le16_to_cpu(u16 x)42 static inline u16 le16_to_cpu(u16 x) {
43     return x;
44 }
le32_to_cpu(u32 x)45 static inline u32 le32_to_cpu(u32 x) {
46     return x;
47 }
le64_to_cpu(u64 x)48 static inline u64 le64_to_cpu(u64 x) {
49     return x;
50 }
51 
cpu_to_be16(u16 x)52 static inline u16 cpu_to_be16(u16 x) {
53     return swab16(x);
54 }
cpu_to_be32(u32 x)55 static inline u32 cpu_to_be32(u32 x) {
56     return swab32(x);
57 }
cpu_to_be64(u64 x)58 static inline u64 cpu_to_be64(u64 x) {
59     return swab64(x);
60 }
be16_to_cpu(u16 x)61 static inline u16 be16_to_cpu(u16 x) {
62     return swab16(x);
63 }
be32_to_cpu(u32 x)64 static inline u32 be32_to_cpu(u32 x) {
65     return swab32(x);
66 }
be64_to_cpu(u64 x)67 static inline u64 be64_to_cpu(u64 x) {
68     return swab64(x);
69 }
70 
71 #endif // byteorder.h
72